The ubiquitous power internet of things(UPIoT) is a complex multi-network system composed of a power system and a combination of intelligent terminal sensors, communication networks, artificial intelligence, and cloud platform technologies. It is with the characteristics of holographic perception, ubiquitous connectivity, open sharing, and fusion innovation. This paper firstly expounded the basic concepts and characteristics of UPIoT, and analyzed its architecture in detail, including the technical architecture, standard architecture, and application architecture. Next, it discussed the key technologies of the ubiquitous power internet of things including intelligent chips, 5G and LPWA, internet of things platform. Afterwards, key difficulties such as business barriers, cyber security, data analytics, and business modes were explored. The actual needs and application prospects of ubiquitous power internet of things were studied.

Voltage source converter based high voltage direct current (VSC-HVDC) transmission systems has the advantages of good active and reactive power control capability and more suitable for multi-terminal transmission system. It is considered as a potential transmission mode. Research on control and stability of VSC-HVDC is an important factor affecting the safety and performance of transmission system. Aiming at the study of control strategies of VSC-HVDC systems, the topologies and decoupling and additional control methods of VSC-HVDC were analyzed. Then it extends from the basic two-terminal topologies to the multi-terminal and hybrid topologies, focus on the droop control, fault ride through capability of VSC-MTDC and control of hybrid direct current transmission system. Next, this paper discussed the stability and control schemes of VSC-HVDC for wind power integration, which will provide reference for future research.

Compressed air system is one of the most important systems in traditional industries. As a main energy consumer, it has important practical significance to save energy from three major links of production, transportation and application. This paper analyzed the main energy consumption of compressed air from production and transportation to the utilization, and a series of improvement measures on energy saving were put forward and analyzed based on the actual working process of compressed air system. The analysis shows that the deep energy conservation transformation is a complex work which needs to be matched with each link, the energy consumption will be greatly reduced when traditional energy saving measures assisted by new frequency conversion technology, aircompressor station intelligent monitoring system and heat recovery technology. This paper can provide reference for energy saving reconstruction of air compressor system in factories and enterprises.

The new generation of artificial intelligence driven by big data has shifted from traditional knowledge representation to deep and autonomous learning. It no longer requires too much human intervention and shows a smarter side. In recent years, deep learning (DL) has become the hotspot of artificial intelligence. This paper focuses on the characteristics, principles and the current application status of DL in the power system. It also analyzes the research trends and problems in the application process of the new generation artificial intelligence, and provides solutions based on distributed machine learning and incremental learning methods. This paper is written for providing references for researchers involved in the field.

In the #1 absorption tower of a power plant wet flue gas desulfurization (WFGD) system, a large number of slurry overflowed from effluent pit, the gypsum moisture content beyond index and mist eliminator was blocked. Through analysis, the main reasons were the high load of absorption tower, the fast flow rate of the tower, the insufficient oxidation of calcium sulfite, the high slurry density in the absorption tower and the less desulfurization absorption slurry atomization particles. Combined with the ultra-low renovation project of the desulfurization system, some equipment expansion was implemented such as increasing the spray layer and backup swirl, switching to the one-way double-headed nozzle and three-roof ridge efficient demisters, installing the stainless-steel tray and synergistic ring on tower wall. Meanwhile, some improvement measures were put forward, such as controlling the pH value and density of the absorption tower, adding desulfurization synergist, increasing the number of oxidation fan operation and improving the demister cleaning frequency.

The electrical energy is converted into mechanical energy in the long term continuous operation of air compressor in thermal power plant. The air is strongly compressed in the process, and the temperature increases greatly, and should be cooled through the cooling system before storage. If this part of the energy is recovered, it can help enterprises to save energy consumption and create good economic, environmental and social effects. In this paper, the scheme of the waste heat utilization of air compressor is designed, and the heat recovery of the compressed air system of six 250kW units in Qing He plant is carried out, the reclaimed heat is used to heat domestic water. The economic analysis is also carried out related to the project. It is shown that the payback period of the project is only about 8 months, and it can save 718 tons of standard coal annually.

Molten salt is the most widely used heat storage material in solar thermal power stations currently. In order to meet the heat storage requirements of the solar thermal power generation system for molten salt, four stainless steels of 304, 316L, 321 and 310S were placed in the ternary mixed chlorinated salt NaCl-KCl-MgCl₂(7:1:2) system at 550℃ to study corrosion characteristics and explore corrosion mechanisms. The research results indicate that 310S shows good corrosion resistance and 304 shows poor corrosion resistance in the NaCl-KCl-MgCl₂ (7:1:2) system of ternary mixed chlorinated salts. The formation of MoO₃, NiO and TiO₂ oxides can improve the corrosion resistance of 316L, 310S and 321. The Cl₂ produced by mixed chloride salts at high temperature is an important cause of corrosion of stainless steel, O₂ and H₂O in the outside air will infiltrate into the molten salt and react with the alloy to accelerate the corrosion.

Aiming at the problems of inefficient manual detection of wind turbine (WT) blades and difficult diagnosis of defects, a method of defects detection for WT blades based on unmanned aerial vehicle (UAV) and image processing is proposed. Through the joint development of Halcon 12 and Visual Studio 2015, the functions of image processing flow, test result output and defects playback are realized, including camera calibration, image processing through fast adaptive weighted median filtering and dynamic threshold segmentation. Through the regional processing to identify defects such as cracks and trachoma, the defects are classified and measured, and the analysis report of WT blades quality can be output to finally realize the automatic detection function of the surface defects of the WT blades. The high accuracy and stability of the algorithm of this method in detecting WT blades surface defects are demonstrated experimentally.

The characteristics of entrainment by jet flow in the spray semi-dry flue gas desulphurization tower have an important influence on the mixing of the flue gas and the absorbent in the tower and the uniform distribution of the flow field. In this paper, the characteristics of entrainment by jet flow of the two-fluid atomizing nozzle are analyzed by numerical simulation method, and the jet flow field distribution in the spray semi-dry flue gas desulfurization tower is obtained. The results show that the jet flow field distribution of the two-fluid atomizing nozzle presents small on both sides of the middle and reflux occurs on both sides of the tower wall; the jet flow fluid exchanges momentum with the surrounding gas and have an obviously entrainment to the surrounding gas. The jet entrainment volume increases gradually along the jet axis direction and with the increase of the amount of wind, the entrainment volume of the jet also gradually increases.

It will lead to the problem of frequency adjustment when the large-scale new energy integrated in the power grid, and large capacity power energy storage is one of the effective solutions for the problem. By analyzing the types of power energy storage and its application scenarios, this paper points out that there are four large capacity energy storage technologies such as electrochemical energy storage, pumped storage, flywheel energy storage and compressed air energy storage which play a role in the power grid frequency adjustment, introduces the performance feature of the four large capacity power energy storage, and summarizes the properties which participate in grid load adjustment, primary frequency modulation, secondary frequency regulation. The characteristic of peak frequency modulation are compared, and the development tendency of research in the future is pointed out.

Electric power communication access network is an important part of power communication network which provides comprehensive support for smart grid. With the development of smart grid, the urgent need is to enhance the level of intelligent network operation and maintenance through technical means to reduce operation and maintenance costs. Meanwhile, the "Internet plus", "Cloud" and other new technologies have been promoted the application. Electric power communication network is undergoing significant change. The increasing of all levels on electric network and user data acquisition, the rising demand for mobile services, construction of distribution network will be the focus. By studying the technical characteristics of power long term evolution (LTE) wireless technology and its application in areas of access network, the paper proposed overall network architecture of power LTE wireless network, and studied LTE wireless communication channel parameters. Finally, through testing and analyzing performance of on-site power LTE communication network which combined currently deployed system, this study can provide technical support for unified construction and unified management of the power terminal access network. The study and the result will lay a solid foundation for the promotion and application of power private LTE network.

As a clean and efficient method of electricity generation, fuel cell is advantageous for high power efficiency, low pollution and noise, and good security, which is one of the most important technologies for distributed power generation. Fuel cell can not only consume the fossil energy like coal or natural gas, but also convert and store renewable energy with its inverse process. In the coal power industry, bulk coal can be utilized cleanly by direct carbon fuel cells, which can solve the problem of low efficiency and severe pollution from bulk coal. Besides, fuel cell can be integrated into natural gas network, forming a micro-combined heat and power system. Compared with the traditional heat and power supply systems, the combined heat and power system has the benefit of energy-step-utilization, with higher efficiency. Furthermore, electrolytic cells can convert the redundant renewable electricity into chemical energy, achieving the energy conversion and storage from the waste hydropower, wind power and solar power, which has great potential in the distributed renewable power system.

The exhaust heat loss of supercritical power station boilers is very large. Recovery and utilization of waste heat from boiler can effectively improve the thermal economy of power plants, and reduce coal consumption and environmental pollution. At present, the way most widely used to improve the utilization efficiency of flue gas waste heat in thermal power plants is to install low temperature economizer. The waste heat utilization technology of a supercritical unit boiler was studied, different low-temperature economizer layout schemes were analyzed, and a technical scheme for recovery of waste heat from power plant boiler by using dual-stage low-temperature economizer was proposed, i.e., the combination of low-temperature flue gas and low-condensation water heat exchange technology, the energy of front air pre-heater and low-temperature economizer. The source cascade utilization mode can achieve optimal energy saving and optimal investment return.

Vibration analysis method can realize condition monitoring and fault diagnosis of transformer without shutdown and disintegration, which is meaningful to improve the reliability of equipment operation. The vibration of transformer surface is closely related to the compaction state, displacement and deformation of transformer windings and cores, and has been extensively studied by domestic and foreign scholar. The numerical calculation and analysis methods and vibration testing techniques in vibration analysis was described. The application of signal processing methods in transformer vibration analysis was introduced in combination with fast Fourier transform (FFT), wavelet, Hilbert-Huang transform (HHT) and blind source separation technology. The role of acoustic analysis methods in transformer abnormal conditions was expounded. The development of the test device was briefly described, mainly the on-line monitoring system and the basic analysis method of off-line vibrabion frequency response analysis(VFRA). According to the trend and difficulty of vibration analysis method in transformer diagnosis application, the direction of further research was given.

Due to the randomness, volatility and anti peak characteristics of wind power, a high proportion of wind power penetrating into the power grid will have a great impact on the stability and security of the power system. Therefore, it is necessary to control the active power of the wind farm to reduce the fluctuation and improve the smoothness of the output power. With the increasing installed capacity, a large number of wind curtailment occur, and the control mode of wind farm is changed from the traditional maximum power point tracking (MPPT) mode to the limit power control mode. The necessity of controlling the active power of the wind farm was analyzed, based on the backgrounds of the control requirements of the wind power connected to power grid and curtailment. Starting from the single machine power control and station level power control, taking the station level power control as the emphasis, the research status of active power control of wind power was summarized. The control characteristics and shortcomings of different control methods were summarized, and research directions were prospected.

With the increasing scale of new energy power generation, longer and longer transmission distances, and access to large-scale distributed generation and DC loads, it is increasingly difficult for existing AC transmission systems to meet the needs of power system development. Due to the technical advantages of high voltage direct current(HVDC), the challenges faced by AC power systems have brought new opportunities for the development of DC power systems. The development status of DC power technologies at different voltage levels in Europe, America, and China were introduced in this paper. The application scenarios of DC power technologies with different voltage levels were described respectively. In light of the shortcomings of existing AC power transmission technologies, the superiority of DC power technologies were analyzed. Finally, the challenges faced by the development of DC power systems under the current state of technology in key equipment R&D, control and protection, and standard setting were introduced.

Artificial intelligence was widely used in power systems. It has improved the security, reliability and operation ability of power systems. The related work in the early, middle and late stages was summarized including expert system and neural network and so on in the 1980s and 1990s and relevance vector machine in the early 21st century. The characteristics, principles and application in power systems of relevant vector machines were mainly introduced.

The safety and stability of power systems is seriously threatened by subsynchronous oscillation (SSO) caused by integration of large-scale wind power. Due to the widespread adoption of power electronic devices, the mechanism and mode of the new type of SSO involving wind power are different from those of traditional SSO. Particularly, the SSO in doubly-fed induction generator (DFIG) based wind farms and direct-drive permanent magnet synchronous generator (PMSG) based wind farms have attracted extensive attention and research both at home and abroad. The commonly used analysis methods and their applicability were summarized. Then, the theoretical results and engineering practices in the aspects of analysis, control and protection of wind power SSOs in recent years were summarized based on typical engineering incidents. The paper aims to provides a reference for the future study of wind power SSO.

Randomness, intermittence and fluctuation are features of new energy, which includes wind energy and solar energy, and power forecasting is an effective solution. The characteristics of wind power output and forecasting model are fully considered to propose piecewise support vector machine (PSVM) and neural network (NN) model; the effort of weather condition on photovoltaic is analyzed to optimize the forecasting model. The case studies from several wind farms and photovoltaic power stations prove that the proposed models have higher precision, which offer support for reliability analysis of power output forecasting.

With the increasing demand for energy and the rapid development of new energy, the technology of generating electricity by wind and solar energy has gradually matured, and the penetration rate in the power grid is also increasing. In order to remedy problems of unstable power and low power quality caused by wind and solar power generation, it is necessary to study the combined power generation of wind power, solar energy and energy storage. In this paper, the strategy of energy storage inhibition control is summarized according to the simple suppression method, the suppression method considering certain constraints, the suppression method considering power prediction and artificial intelligence. In the study of energy storage to tame scenery fluctuation filtering algorithm is the most common method, adding certain constraints can make smooth effect better, and energy storage to tame with accurate prediction can make the system smoother. Multi-energy storage technology can give full play to the advantages of energy storage technology. The wind energy storage complementary system with the energy storage device can effectively reduce the adverse effect of the original wind energy complementary system on the power grid. It can smooth the output characteristics of the wind power generation system to a higher degree, increase the acceptance of renewable energy to the power grid, and achieve good economic and social benefits.

Three tower heliostat field layouts, EB, No blocking-dense, and DELSOL derived from the radial staggered layout and the principle of no blocking loss, were studied. After summarizing the mathematical models of the three heliostat field layouts, combined with some design parameters of Gemasolar power tower plant, the software SolarPILOT was used to model and simulate the heliostat field according to the three layout modes. MATLAB was used to process the coordinate data of the heliostat field obtained by the modeling, and the change curves of radial spacing and azimuth spacing were obtained, so as to verify the rationality of the three layout mathematical models. The layout rules of the heliostat ring were obtained by analyzing the arrangement characteristics of the basic ring and the staggered ring in each heliostat field. At the same time, the performance of different layouts was compared from the number of heliostats, the optical efficiency, the land utilization ratio and the receiving energy of the heliostat field, and their advantages and disadvantages were analyzed. The results show that in the range of 1 000 m radius of the heliostat field, the average annual optical efficiency and land utilization rate of the heliostat field under the No blocking-dense layout are the highest, followed by the EB layout. However, the number of the heliostats and the receiving energy of the heliostat field under the EB layout are the largest, and the performance characteristics of the DELSOL layout are the lowest.

With the increasing share of renewable energy in power system, more and more coal-fired power units participate flexibility generation. For clarifying the air emission characteristics of flexibility generation, the operation history data of two subcritical coal-fired power units (600 MW and 300 MW) are used for regression analysis. In normal cyclic operation, power ramping-down will lead to a little increase in coal consumption rate and CO₂ emissions factor. Meanwhile, the NO_x emissions factor will decrease firstly and then increase when ramping down and the amplitude of variation is little in clean flue gas. The SO₂ emissions factor will decrease a little while dust factor will increase a little when ramping down. In deep cycling operation, the increase in coal consumption rate and CO₂ emissions factor will be much larger, while the NO_x and dust emissions factors will increase substantially when SO₂ emissions factor continues to decrease in clean flue gas. In start-up process, the NO_x and dust emissions are much larger while SO₂ emissions are slightly smaller than regular operating conditions. In addition, larger ramping rate has remarkable impact on NO_x and SO₂ in untreated flue gas and on dust in clean flue gas in deep cycling conditions.

Building ubiquitous power internet of things (UPIoT) is a necessary means to achieve the goal of energy transformation. Starting from the development history and problems of power system, the significance of UPIoT was discussed, and the implementation strategies and possible problems were put forward. In order to realize the energy transformation, the installed capacity of renewable energy such as wind, photovoltaic (PV) and so on is increasing. The randomness of these sources of energy causes tremendous pressure on the power balance of power systems, sometimes having to abandon part of electricity from wind farms and PV. In order to maintain the stable operation of power system and improve the utilization rate of wind power and photoelectricity, it is necessary to control controllable load and decentralized generation. Therefore, it is necessary to connect controllable load and decentralized power generation with the internet to form a UPIoT. Conventional power plants, large-scale wind farms, PV stations have been connected to dispatching center, and can be directly controlled. Therefore, the main task of UPIoT is to connect load and distributed generation, especially controllable load. Electric vehicles are the easiest controllable loads, followed by water heaters, electric boilers and air conditioners. Utilizing the UPIoT, coordinated control of wind power and PV, controllable load, decentralized power generation, etc., can improve the utilization rate of wind power and PV, and achieve the goal of energy transformation.

Urban distribution network is an important link for users, and it is of great social and economic significance to carry out scientific evaluation on power supply capacity of urban distribution network. Firstly, this paper summarizes the concept of power supply capacity of urban distribution network, traditional evaluation method and evaluation model. Secondly, the urban distribution network power supply capability evaluation steps are divided into three parts:building urban distribution network, power supply capability evaluation index system of evaluation index weights and evaluation method, and summary analysis are carried on each steps and content. Finally, the application prospect and research direction of power supply capacity assessment of urban distribution network are pointed out.

In recent years, the use of phase change material (PCM) to improve the output performance of semiconductor thermoelectric generator (TEG) and maintain the long-term operation of TEG has been widely concerned. In view of the current situation that the existing PCM-TEG combination methods are complicated and lack of unified understanding, this paper established a PCM-TEG coupling mathematical model, compared the system performance when PCM is arranged on the hot side, cold side and double sides of TEG, and proposed a skeleton with PCM design and verified its effectiveness. The results show that, through the design of PCM, the output capacity of the TEG can be improved by the device thermal management, which can effectively avoid the failure of thermoelectric devices due to its own heat storage capacity. The skeleton with PCM design is superior to the conventional PCM-TEG system performance. The design of hot-side-PCM-TEG on the double-sides-PCM-TEG on double sides can effectively maintain the stable operation of TEG. Enhancing the heat transfer capacity of TEG on the cold side can make up for the defect of insufficient output performance of hot-side-PCM-TEG. The study results can provide a reference for the next research on the relevant application of PCM-TEG.

Under the development trend advocated by the new energy policy, the development of new energy vehicles in China has made great progress, and the battery energy density of electric vehicles has increased. The power of the DC charging pile charged by the corresponding electric vehicle power battery is getting higher and higher, so that the charging power of the DC charging pile accounts for an increasing proportion of the total load power of the distribution layer, which brings new challenges to the planning and construction of the distribution network. According to the arbitrarily interruptible charging process of the electric vehicle, it is proposed that when the total scale of the electric vehicle reaches a certain amount, the overall charging power of the electric vehicle can be flexibly controlled, thereby achieving the purpose of peak shaving for the power grid. Through the analysis of the power and control mode of the electric vehicle charging pile, it is concluded that when the number of DC charging piles and their total power in the distribution network load reaches a certain scale, in the cluster control mode, it is more suitable to participate in the peaking of the distribution network layer.

In recent years, the wind and PV power curtailment is becoming more and more serious, and the demand for deep peaking capacity of coal-fired power plants is also increasing. In this paper, the flexibility transformation of 350MW super-critical cogeneration units was studied combined with the relevant policies of thermal power unit's deep peak shaving compensation in North China. The optimal scheme suitable for our factory was obtained through analyzing several mainstream flexibility transformation technologies, comparing the advantages and disadvantages, investment costs and operating costs of various technologies, evaluating the effect of unit flexibility on later operation combined with the compensation for peak adjustment in the region. The results show that the low-pressure cylinder zero output heating technology is the lowest cost scheme coping thermoelectric decoupling. When the unit price of standard coal is below 700 yuan per ton, the unit is not suitable for peak adjustment and should be loaded with more load; and when the price of the standard coal is above 700 yuan per ton, it is possible to reduce unit load to reduce loss through peak regulation.

In the long-term overheating operation condition, the boiler high temperature superheater is easy to cause the deterioration of materials and the decline of material structure and performance, and causes the pipe explosion accident. The causes of burst tube of final-stage superheater tube in a power plant boiler were analysed through macroscopic examination, Brinell hardness test, tensile strength test and metallographic structure test. The analysis results show that final-stage superheater tube operates at high temperature and pressure for a long time, resulting in the carbide enrichment at grain boundary and weaken the grain boundary strength. Under the action of tensile stress, creep cavities and creep cracks occur at grain boundary, resulting in the decrease of durable strength and tensile strength of pearlite heat-resistant steel, and finally the fracture failure occurs.

A kind of connection scheme of three-terminal back-to-back (BTB) voltage source converter based HVDC(VSC-HVDC) system in 10 kV distribution network was discussed, which can improve the reliability of power supply and restrain the circulation by the control of VHC-HVDC. With the traditional control strategies, VSC-HVDC system has almost no interia and is hard to be involved in the dynamic regulation of the power system effectively. To improve the stability of the frequency in the receiving system and improve the performance of the system after the breakdown, the control strategy of virtual synchronous generator (VSG) in the application of three terminal back-to-back VSC-HVDC under a medium voltage (10 kV) AC distribution network context was proposed. First three terminal back-to-back VSC-HVDC device was added to the 10 kV system to establish the AC/DC hybrid distribution network, and the mathematical model of the converter under the traditional control and VSG control was established. Then the simulation was carried out by using the PSCAD/EMTDC platform, the operating characteristics of disturbance and fault were obtained in two control modes. The results show that the three-terminal back-to-back VSC-HVDC system can effectively participate in the regulation of power grid system using VSG control, and gain the interia to improve the system's performances of transient states, and the reliability of the grid are effectively improved.

A combined numerical simulation is conducted to couple fluid flow between exhaust hood and last-stage blades of a 600 MW steam turbine using the computational fluid dynamics software CFX. Based on quadratic orthogonal regression design, the flow guide device at the top of the exhaust hood is installed. The regression orthogonal equation between the installation parameters of the guide plate and the coefficient of static pressure recovery is obtained. The equation is remarkably unlost with nonlinear relation and there is no influence among the three factors. The optimal solution of the regression equation is solved. The channel vortex is broken and the aerodynamic performance of the exhaust hood is improved obviously after the diversion plate is installed. The static pressure recovery coefficient of exhaust hood outlet is increased by 3.008%, the total pressure loss coefficient is reduced by 5.789% and the standard deviation of the outlet is reduced by 3.043. The static pressure recovery coefficient of exhaust hood outlet under different loads after the optimization is always higher than that before the optimization.

The integration of heat pump can realize heat-power decoupling, and would influence the energy consumption characteristics of combined heat and power cogeneration plants (CHP). Therefore, a 350MW CHP unit was taken as a reference case, and the off-design calculation models of CHP unit and the heating calculation models of heat pump were established. The minimum power load rate and the coal consumption rate of the CHP plants with steam extraction and heat pump to supply heat were compared. The influences of the heat pump performance coefficient, the power load rate and the heat load rate on energy consumption characteristics of CHP plants were also studied. Results show that the compression heat pump can save energy on benchmark condition and its power load regulation range is also greater. The coal saving rate increases with the increase of α_COP1 and heat load rate, and decreases as power load rate increases. When the α_COP1 is 6.119, the heat load rate is 2.5, and the electric load rate is 0.8, the coal saving rate is 2.60%.

Numerous UHVAC and UHVDC projects built and put into operation successively, has marked power grid construction in China at the international leading level. Meanwhile, the operation and control of large power grid in China is facing unprecedented problems and challenges. The article introduces the situation of large power grid, which has the characteristics of increasing proportion of new energy and long-distance transmission of power with high capacity across large areas. The problems and challenges of power grid operation and control were analyzed. Several measures were taken by Northeast China Grid, such as peak regulation ancillary service market and high frequency emergency control system, which promote coordination of grid and source and new energy integration.

According to electric power development the 13th five-year plan and related national policies and legislations, we analyzed coal-fired power units' design technology trend in China in the future and concluded that the core of coal-fired power units' development would be clean coal power generation in the next five years and focusing on low carbon coal power generation research at the same time. During the 13th five-year plan, ultra supercritical coal-fired power generation with higher parameter, ultra-low emission reconstruction in fault coal-fired plants, flexibility and energy saving reconstruction, deep water conservation and biomass co-combustion in large coal-fired boilers have certain development space, and more suggestions are emphasized on technology research areas.

China is adjusting its energy structure, improving the level of energy utilization, realizing the deep integration of energy utilization and information, and building a smart energy system. Through in-depth analysis of the current status of intelligent power plant construction, the integration of BIG data, Internet of Things (IOT), visualization, advanced instrumentation and other advanced technologies, combined with the digital level of Hubei Huadian Wuchang Thermal Power Ltd., an intelligent combined cycle power plant construction scheme was proposed. An integrated platform was constructed by combing the information of production and management. By using the technologies including smart equipment, operation data mining and management information analyzing at equipment layer, control layer and management layer, the target of security, reliable, economic, efficient and lean management will be accomplished in the future.

Vibration has always been an important factor to endanger the operation of the unit. In this paper, the abnormal phenomenon of the vibration of a 350 MW supercritical unit was analyzed, in which the steam-flow exciting vibration happened. In the single valve operation mode, the frequency of vibration was suppressed by adjusting the condenser vacuum, lubricating oil temperature and shaft seal steam supply pressure. Then, the influence of several typical factors on the vibration was studied. Based on the conclusion of the test, this paper put forward the processing scheme to switch to the sequential valve operation mode, and determined the reasonable opening sequence of valves, and optimized the valve distribution curve. Finally, the steam-flow exciting vibration of the unit is solved effectively, the safety and stability operation of the unit is guaranteed.

In order to supply electricity in off-grid areas and under emergency conditions such as fire accident, earthquake, and snow disaster, a water-cooled thermoel-ectric generator was designed, which can be fueled with wood, charcoal and other biomass, and it is featured by the incorporation of a radial-shaped heat collector. The ther-moelectric generator, weighting of 23.3 kg, incorporates a DC-DC converter to stabilize the output voltage. The start-up performance, no-load characteristic and power load feature of the thermoelectric generator were studied in detail. Results show that the average temperature difference is approximate 68℃, and the maximum no-load voltage reached 116.3 V. In loaded case, the electric power output decreases with the external load resistance. The maximum electric power output is found to be 22.4 W when the external load resistance is 1.6 Ω; and the thermoelectric generator is not able to output electricity steadily when the external load is reduced hereby.

The electric heating is an important component of clean heating that the State encouraged. However, the cost of conventional electricity consumption is high. It is not only eliminating wind power curtailment but also reduces the cost of electric heating by using the abandoned wind power. Taking an actual power grid as an example, this paper proposed a coordinated dispatching strategy of abandoned wind heat storage for heating by studying the total amount of abandoned wind, heat storage capacity and heating capacity. This work has great practical significance for a power grid with large-scale abandoned wind power capacity and large-scale heat storage.

The reserve of hydropower resources is tremendous in Africa. However, due to lack of financial input and technical support, Africa's hydropower resources have not been developed and utilized on a large scale. Power shortages have become one of the main "stumbling blocks" to Africa's socio-economic developments. Based on a large number of data analysis and statistics, the potential and status of hydropower development in various regions of Africa was analyzed, the hydropower development planning of major countries was interpreted, and the spatial evaluation of hydropower investment in Africa was given. The characteristics of Chinese enterprises' hydropower development in Africa for a long time was deeply analyzed, the advantages of Chinese enterprises were summarized, and some key points and suggestions for Chinese enterprises to invest in Africa were put forward.

The economy of the power plant could be effectively improved by the deep utilization of waste heat. Several types of waste heat utilization methods at home and abroad were reviewed, including the conventional waste heat utilization method and several new methods, such as heat ex-changer grading, bypass flue technology and heat pump technology. A detailed comparison of the energy-saving effects of different waste heat utilization methods was conducted. It is considered that the heat recovered from conventional low-temperature economizer flue gas is relatively limited. The graded waste heat utilization can be achieved by the hierarchical method. The bypass flue technology is more economical because of the displaces of extraction from higher-grade steam turbines. The energy quality can be further enhanced by the heat pump technology.

In order to realize zero discharge of desulfurization wastewater, evaporation and crystallization technology of desulfurization wastewater with high temperature flue gas has gradually developed. The decomposition of crystalline salts in desulfurization wastewater evaporation process is probably the key problem that may influence the further application of evaporation technology. This paper briefly introduced the characteristics of desulphurization wastewater in thermal power plants and the stability of salt during evaporation and crystallization. The thermal decomposition mechanism of hydrated magnesium chloride was introduced emphatically. The comprehensive analysis shows that magnesium chloride and ammoniate will be decomposed to produce hydrogen chloride gas and ammonia respectively, which will increase the content of chlorine ion in the desulphurization wastewater and ammonia concentration at chimney outlet. Finally, the quality reduction of fly ash in the evaporation process with by-pass high-temperature flue gas was also discussed.