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- Abstract：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.Keywords：large capacity power energy storage;peak regulation and frequency adjustment;electrochemical energy storage;pumped storage;flywheel energy storage;compressed air energy storage43|815|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：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.Keywords：large power grid;operation and control;new energy;direct current transmission across areas70|698|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
Summary of Urban Distribution Network Structure Mode and Substation Configuration at Home and Abroad
Abstract：The selection of urban distribution network structure mode and substation configuration can affect the organizational structure and construction investment scale of the power grid. How to reasonably choose the network structure mode, substation main wiring mode and substation capacity with consideration of reliability and economy is the main problem faced by power supply enterprises. In this paper, four developed urban power grids abroad and eight major urban power grids in China are selected to analyze their power grid status, voltage series, grid structure, substation configuration and construction concepts. Reference is provided for urban distribution network construction in China.Keywords：distribution network;distribution network structure;substation main wiring;substation capacity87|554|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04- Abstract：Power line condition monitoring system is an important part of smart grid. In order to efficiently transmit the structured data of a power line condition monitoring system, this paper uses Google Protocol Buffers to replace the inefficient data transmission method, based on Web Service, of the current power line monitoring system. A new data transmission scheme based on Protocol Buffers is designed for the power line condition monitoring system in this research, and its performance is compared with that of current Web Service scheme in terms of time and space. The experiments shows that the proposed scheme is more efficient and takes less storage space.Keywords：power lines;data transmission;structured data;Protocol Buffers;extensible markup language (XML)38|296|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
Energy Internet
- Abstract：With large-scale wind and solar energy power units put into operation, it brings great influence on the stability and safety of the power network due to the high fluctuation and randomness features of the wind and solar resources. In order to absorb more new energy power, regional load dispatch center puts up very high requirement for the operation flexibility, load fast-following and deep peak load regulation ability. Therefore, it is very significant to adopt advanced control strategies to optimize the coordinated control system (CCS) to improve its control quality. In this work, the load prediction neural network model considering "condensate throttling" and the main steam pressure prediction model were developed by taking a 1000 MW ultra-supercritical power unit as the object investigated. Based on the established models, a classic optimization theory-improved simplex method was selected as the CCS optimization algorithm. An intelligent coordination optimization scheme with condensate throttling was designed, and the real-time optimization program was developed with MATLAB software. Detailed simulation tests were carried out in the full-scope simulator of the 1000 MW power unit. Simulation results indicate that the proposed scheme can effectively improve the coordinated control quality with faster load response, less main steam pressure fluctuation during dynamic load-changing process.Keywords：ultra-supercritical power unit;coordinated control system;neural network modelling;simplex method;predictive optimization control;condensate throttling55|273|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：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.Keywords：smart power plant;equipment layer;control layer;production management layer37|271|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：As an efficient way of energy utilization, the exhaust temperature after exhaust waste heat recovery of the internal combustion engine distributed combined cooling heating and power (DCCHP) systems is about 100℃, and some of the low temperature waste heat is still not fully utilized. To achieve the deep recovery of exhaust waste heat, a DCCHP dynamic exhaust low temperature waste heat coupled air source heat pump system was proposed in this paper. Based on the DCCHP system of 10 kW internal combustion engine, the effects of the recyclable waste heat of the system, the coefficient of performance (COP) of the heat pump and the impact of the primary energy utilization rate was studied. The results show that under the design condition, the exhaust waste heat of DCCHP system is 1.22 kW, the recyclable waste heat of heat pump system is up to 1.07 kW, the exhaust waste heat recovery rate is 87.7%, the COP is up to 4.66, increasing 39.5%. The primary energy utilization efficiency is increased by 3.9%. The problems of frosting and poor performance of heat pump evaporator unit in cold region were solved. This study provides an important reference for the combined and efficient application of CCHP systems and heat pump units.Keywords：energy utilization;air source heat pump;exhaust waste heat;primary energy utilization efficiency39|5|0<HTML><DownloadPDF> <Meta-XML>Updated：2025-07-04
- Abstract：In order to study the characteristics of NOx emission and ammonia escape after reform for six-corner tangentially fired boiler, we have done a large number of field tests. The results show that the NOx emission before selective catalytic reduction (SCR) denitrification system are uneven distribution, there are too much ammonia injection in SCR denitrification system, they are the most important factors that lead to the uneven distribution of NOx in export and the ammonia escape exceeds the design value, the ammonia injection of SCR needs to be optimized.Keywords：ammonia spraying optimization;NOx distribution;selective catalytic reduction (SCR);ammonia escape29|8|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：The high-temperature superheater bursting accident is one of the main factors that affect the safe operation of power plants, and causes the greatest loss. Based on the actual work in the field, the reasons for the leakage of final superheater of boiler No. 1 in a power plant are discussed. Through a variety of test means such as macroscopic test, chemical composition analysis, mechanical properties test and microstructure observation, the tubes are comprehensively analyzed to improve the failure of the heating surface tube of the boiler. The analysis shows that the leakage of the last stage superheater is caused by long overheating. The microstructure near the leakage position is ferrite plus carbides, pearlite spheroidized up to 5 levels, and there are a lot of creep cracks.Keywords：boiler;heating surface tube;failure analysis;spheroidization51|268|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：The electric circuit and control program for outlet butterfly valve of circulating water pump have the problems that cannot be grasped in real time, and the opening degree and the opening speed of outlet butterfly valve cannot meet the operation requirements for circulating water pump. Combining with the actual operation needs, the electrical circuit of the butterfly valve was optimized and adjusted, and the local indication was added. At the same time, the butterfly valve control program was optimized, and the butterfly valve opening and valve opening control logic were improved, thus the safety, reliability and stability of the electric circuit and control program for outlet butterfly valve was ensured, effectively avoiding the occurrence of major accidents caused by the startup failure of the butterfly valve at the outlet of the circulating water pump and the untimely operation. Through the optimization and adjustment of electrical circuits and control programs, the purpose of guiding the operation in real time can be achieved.Keywords：circulating water pump;butterfly valve;opening degree;programmable logic controller(PLC)37|214|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：In this paper, the problem of corrosion in the reinforced concrete chimneys after being processed using wet desulfurization is discussed, and the changes within the structure of the concrete caused by acidic corrosion are analyzed. In addition to the basic anti-corrosion and impermeability, the anti-corrosion system must face the reality that the internal structure of the concrete chimneys contains salt. After desulfurization, there appears a new topic in the industry, i.e. how to keep reliably bonded of the anti-corrosion system and the chimney structure after the anti-corrosion maintenance of the chimney impaired by water leakage. Through comparison of the advantages and disadvantages of several anti-corrosion schemes commonly used in China, this paper analyzes the mechanism, characteristics, and advantages of anticorrosive systems successfully applied for chimneys provided by Köster.Keywords：concrete chimney;anti-corrosion;wet desulfurization;salt medium;material selection;Köster50|164|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
Power Generation and Environmental Protection
- Abstract：Reasonable allocation of power output from different power sources is a core part of fuel cell vehicle energy management. In this paper, an energy management strategy controlled by hybrid fuzzy logic is proposed for the hybrid energy storage system of "fuel cell+battery (FC+B)" electric vehicle. This strategy dynamically adjusts the power distribution according to the load demand power, current state of charge (SOC) of the battery and the target value of the battery SOC. The proposed hybrid fuzzy logic control is verified by MATLAB/Simulink. The simulation results show that when the SOC of the battery is moderate (the state of charge value is represented by HSOC, when HSOC=60%), the change of SOC is almost the same under the combined fuzzy logic control strategy and power tracking strategy, but the hydrogen consumption of the former is reduced by 0.54g. When the initial SOC of the battery is lower or higher (taking HSOC=39.8% and HSOC=80.2%, respectively), compared with the power tracking strategy, this strategy makes the battery SOC approach the target value gradually. This strategy can improve the efficiency of the system by reducing the energy consumption of fuel cell. The control is more flexible and has certain practical value.Keywords：fuel cell vehicle;hybrid power system;energy management;hybrid fuzzy logic controller40|294|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：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.Keywords：solar energy;molten salt;chloride;corrosion;stainless steel66|242|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：The operating temperature of silicon-based photovoltaic (PV) modules has a significant impact on the electrical performance and power generation efficiency, which is an important parameter of PV system modeling and performance evaluation. Its precise calculation is very important for PV system analysis and maximum power tracking. Based on physics-based method of the operating temperature of silicon-based PV modules, it is found that the accuracy of the algorithm always changes with seasons and weather conditions, which resulted in a big error between the calculated and actual output of the PV plant. Aiming at the above problem, the paper proposes an online modelling method for the operating temperature of silicon-based PV modules, which adopts the multi-layer back propagation artificial neural network (BP-ANN) algorithm and uses the measured solar irradiance, ambient temperature, output power of PV modules as the inputs and the PV module operating temperature as the model output. And the online soft sensor of the operating temperature of the silicon-based PV module is realized. The proposed method is verified based on the actual operating data, whose comparative results show that the above method is effective. If conditions permit, wind speed should also be one of the inputs to the model.Keywords：PV power generation;operating temperature of PV modules;neural network;online modelling52|494|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：In this paper, an optimal distributed control strategy of active power of wind turbine generators was proposed. Based on this strategy, a development scheme of optimal distributed control system was proposed. In the scheme, the system was set up between the automatic generation control (AGC) system of wind farm and the energy management system (EMS) of wind turbine generators, and the original framework of AGC system and EMS would not been changed. For the purpose to effective employ the facility with high price of electricity and stability, the system can achieve the optimal distributed controlling of active power of wind turbine generators, by considering the factors of group of wind turbine generators, such as price of electricity, stability of facility, power generation capacity and facility life.Keywords：wind turbine generators;active power;optimal control22|327|0<HTML><L-PDF> <Meta-XML>Updated：2025-07-04
- Abstract：With the deepening contradiction between energy and environment, the energy industry is transforming from traditional energy to clean energy. Therefore, more and more attention will be paid to high efficiency and low carbon natural gas distributed energy (NGDE). However the continuous improvement of environmental protection requirements will strongly promote the large-scale application flue gas denitriation in project. In this paper, the application possibility of selective catalytic reduction (SCR) denitriation is analyzed and studied, taking a building-type project in NGDE as the research object. Finally, the project has been successfully applied in a small MW NGDE system, and the efficiency of denitriation is over 95%, and the emission value of NOx is 25.4 mg/m3, which meets the emission standard in Beijing. It provides a new solution for denitriation of NGDE projects.Keywords：natural gas distributed energy(NGDE);selective catalytic reduction (SCR);denitriation;engineering application24|433|0<HTML><L-PDF>Updated：2025-07-04
New and Renewable Energy
