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- Abstract：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.Keywords：abandoned wind;heat storage;heating;large scale37|1038|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：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.Keywords：scenery storage combined power generation;energy storage optimization;control strategy;stabilizing control50|417|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：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.Keywords：grid-connected wind power generation;subsynchronous oscillation (SSO);doubly-fed induction generator;direct-drive permanent magnet synchronous generator103|2997|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：Unified power quality conditioner (UPQC) has been researched by scholars at home and abroad because it is most attractive measure to improve power quality of power distribution system or microgrid. Under given topological structure and compensation, the performances of UPQC depend mainly upon control strategy. Therefore the linear control strategy, nonlinear control strategy, intelligent control strategy of UPQC, are reviewed in this paper. Advantages and disadvantages of current control strategy of UPQC are pointed out. The new passivity based hybrid control strategy and the fusion of different control strategies are given to overcome the disadvantages of current control strategy. The above content can be used as the reference for researcher.Keywords：unified power quality conditioner(UPQC);series inverter;shunt inverter;control strategy;compensation91|469|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：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.Keywords：wireless communications;architecture;channel capacity;power private network;delay36|1729|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
Energy Internet
- Abstract：A novel combined power and refrigeration system coupled with a trans-critical carbon dioxide (TCO2) recompression cycle and an ejector refrigeration cycle is proposed, which produces power output and refrigeration by utilizing low-grade thermal energy discharged from the CO2 recompression cycle. The performance of combined cycle was compared with that of recompression cycle, and an exergy and parametric analysis was performed to evaluate the effect of key thermodynamic parameters on the performance of the combined cycle. The results show that because of the utilizing of waste heat from CO2 which drives the ejector to generate cooling capacity, thermal efficiency of the combined cycle is higher than that of the recompression cycle. The biggest exergy loss occurs in the heater and the heat regenerator came second. It is also shown that the turbine inlet pressure, inlet temperature and back pressure have significant effect on the mass flow rate, turbine power output, power consumption of compressor, refrigeration output and thermal efficiency of the combined cycle. However, the condenser temperature and the evaporator temperature only have remarkable influences on the refrigeration output of the ejector refrigeration cycle. The thermal and exergy efficiency of the combined cycle are severally 46.99% and 47.21% under the given condition.Keywords：trans-critical carbon dioxide (TCO2);recompression cycle;ejector refrigeration;combined power and refrigeration44|199|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：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.Keywords：spray desulfurization;entrainment by jet flow;flow field;numerical simulation32|1312|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：Spraying flue gas desulfurization (FGD) wastewater into flue duct is an economical and feasible technology to achieve zero discharge in power plant. To deal with the scale and corrosion on flue walls that exist in the practical application of this technology, the physical and mathematical models are established based on a 300 MW power plant. The Eulerian-Lagrangian approach is used to describe the thermo-fluid behavior of FGD wastewater in flue gas, by which the turbulent flow heat transfer of flue gas is described by the Eulerian framework and the evaporation of water droplets is described using the Lagrangian framework. By numerical simulation the flow evaporation characteristics and influencing factors of FGD wastewater droplets sprayed in flue gas were studied. The diffusion range and trajectories of atomized droplets under different operating conditions were obtained. The following results were gained:higher flue gas temperature and smaller diameter of the atomized droplets contribute to shorter time and distance for complete evaporation. Besides, the arrangement of small-flow-multi nozzles can improve the evaporation of atomized droplets. The spray direction must ensure that the relative movement between atomized droplets and flue gas is enhanced, while the droplets can fully diffuse and contact with the flue gas within a specified distance and time, achieving maximum evaporation of the atomized droplets. However, the initial velocity of atomized droplets, the spray full cone angle of nozzles, and the velocity of flue gas have little influence on atomized droplets evaporation. These research results can provide process design and performance regulation of the FGD wastewater evaporation in flue duct of thermal power plants.Keywords：desulfurization wastewater zero discharge;flue gas evaporation;droplet evaporation characteristics;numerical simulation54|1869|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：The energy saving and consumption reduction is the main development direction of China's power generation industry. The impinging stream can generate a great relative phase-to-phase velocity at the moment of impact, and form a relatively narrow height turbulence zone, which can greatly improve the heat and mass transfer. This nature of flow can be widely used in the related fields of the power generation industry, especially in the areas of combustion, drying, sewage treatment, desulfurization and denitrification, coal gasification, dust removal, etc. In this paper, based on a brief introduction to the basic principle and classification of impinging stream technology, the research progress of impinging stream technology in recent years is summarized, and the application prospects of impinging stream technology in related fields of power generation industry are discussed, in order to provide reference for further application of impact flow technology in the power generation industry.Keywords：impinging streams;power generation industry;energy saving and consumption reduction;application prospects54|225|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：Carbon ultimate analysis is an essential procedure to guarantee the data quality of carbon content per unit calorific value, especially of great importance to greenhouse gas emissions accounting for coal-fired power plants. In order to have a better understanding of carbon ultimate analysis, the effect of quantitative measurement of carbon element on carbon content of unit calorific value was researched. Meanwhile, the obstacle for application of carbon content measurement was figured out. Suggestions on method to solve problems occurred during the popularization of ultimate analysis were proposed. It concludes that the application of ultimate analysis facilitates acquires reasonable benefits for coal-fired power plants during the emission trading scheme while causing minor economic costs.Keywords：coal-fired power plants;greenhouse gas;emissions accounting;carbon ultimate analysis53|289|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：In order to solve the problem of high reheated steam temperature fluctuation, difficult operation of automatic control and low economical efficiency because of high spraying water in supercritical unit, an advanced reheated steam temperature optimal control strategy being applicable to big lag and nonlinear characteristic was put forward by combining the active disturbance rejection controller (ADRC) with the Smith predictive compensation control. Through the simulation of the reheated steam temperature object in 600 MW supercritical unit, the results show that compared with the traditional reheated steam temperature control system, the proposed advanced reheated steam temperature control strategy can decrease the reheated steam temperature fluctuations, setpoint tracking performance and disturbance rejection can be improved, also the economical efficiency can be raised by reducing the amount of spraying water.Keywords：active disturbance rejection controller (ADRC);reheated steam temperature;Smith predictive compensation;economical efficiency31|630|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：In order to expand the heat supply capacity of 600MW supercritical condensing turbine-generator unit and meet the requirements of combined heat and power production, several technical measures to improve the external heat supply capacity of the unit have been studied. A new pattern on heat supply retrofit was put forward, which is to stop #1 & #2 HP heater, and extract the original #1 & #2 section steam from cold reheater to increase the quantity of external heating supply. The influences on selective catalytic reduction (SCR), the safety of the last stage blades of the steam turbine, the axial thrust of the steam turbine and the economy were analyzed. It is proved that the method is feasible, worthy for reference when the condensing turbine-generator unit implements large flow low pressure heat supply retrofit.Keywords：condensing turbine-generator unit;heat supply;retrofit;HP heater13|56|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：After low pressure economizer was put into the unit, waste heat of boiler flue gas enters the regenerative system. The extraction steam returns to low pressure cylinder, and the steam volume increases, which causes the change of the back pressure of the steam turbine. According to the equivalent enthalpy drop theory, the calculation model of back pressure change was established. The model is verified through the test and analysis of one 220MW unit. Under 220MW working condition, the steam turbine back pressure is increased by 0.29 kPa. After the correction of the back pressure, the energy saving of "equivalent enthalpy drop method" decreases by 0.19%, which is closer to the energy saving of the "thermal test method". It shows that in the energy saving effect analysis of operating low-cost economizer with the "equivalent enthalpy drop method", the impact of back pressure changes on energy savings need to be considered.Keywords：low pressure economizer;net increase of exhaust steam;change of steam turbine back pressure;equivalent enthalpy drop36|268|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：The pipelines of the EH oil system of the steam turbine are connected to the oil supply system, emergency shutoff system and the implementing agency to form the entire circuit. As the transmission channel of the oil medium, once a leak occurs, it will directly cause the unplanned outage of the generator set, which will result in huge losses of economic benefits and social benefits for the enterprise. A few typical cases of EH oil pipeline leakage occurred in thermal power generation units recently. In this paper, several types of failure mechanisms that are common to EH oil pipelines were summarized from the perspective of metal materials. Combined with each typical case, the failure analysis process and its focus were introduced briefly. And from the technical supervision point of view, the paper puts forward the governance and preventive measures importantly, specific to the corresponding inspection methods and inspection contents, which fit the scene for reference.Keywords：EH oil pipeline;leakage;failure mechanism;supervision;inspection82|336|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
- Abstract：Microbial pollution is one of the main types of reverse osmosis membrane pollution in seawater desalination system. In the spring of 2016, frequent and rapid increasing of pressure difference, constant desalting rate and decreased water yield happened in the first-order reverse osmosis membrane of the seawater desalination system in Hongyanhe nuclear power plant. After dissection analysis of reverse osmosis membrane, the main reason was microbial contamination. The microbial growth caused by incomplete sterilization lead to an increasing of pressure difference and decreasing of water yield. By increasing the amount of sodium hypochlorite added to the pretreatment fungicide of seawater, the amount of residual chlorine at the outlet of the ultrafiltration water tank was increased in order to decrease the breeding of microorganisms in the sea water. And in different seasons, different concentrations of dosage would be controlled. It is verified that this measure can control the inlet microorganism of the reverse osmosis system at a low level, reduce the increasing frequency of pressure difference, and improve the operation reliability of the equipment of the sea water desalination system of Hongyanhe nuclear power plant.Keywords：seawater desalination;microbes;residual chlorine30|173|0<HTML><L-PDF> <Meta-XML>Updated：2025-06-06
Power Generation and Environment Protection
