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Review on solar thermal power generation technologies and their development ZHANG Jinping, ZHOU Qiang, WANG Dingmei, LI Jin, LIU Lijuan Integrated Intelligent Energy    2023, 45 (2): 44-52.   DOI: 10.3969/j.issn.2097-0706.2023.02.006 Abstract （1007）   HTML （38）    PDF （928KB）（5167）       Knowledge map    Under the "dual carbon" target， new energy ushers in a leapfrog development，which makes an higher requirement for power system flexibility. The regulation capacity of concentrating solar power （CSP）plants can rival that of conventional thermal units. CSP plants can participate in peak load and frequency regulations timely and deeply， which improves the flexibility of the power system. Thus，CSP is a promising renewable energy generation technology. Based on the introduction on the operation principle and structure of a CSP plant， the advantages，disadvantages and research progress of various CSP technologies are analyzed. The problems and development direction of CSP technology are discussed based on the status quo and demand of CSP. Table and Figures | Reference | Related Articles | Metrics

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Study on the status quo and development trend of grid-forming converter technology YU Guo, WU Jun, XIA Re, CHEN Yihui, GUO Zihui, HUANG Wenxin Integrated Intelligent Energy    2022, 44 (9): 65-70.   DOI: 10.3969/j.issn.2097-0706.2022.09.009 Abstract （883）   HTML （13）    PDF （1104KB）（3800）       Knowledge map    Due to the numerous electric and electrical devices and high-penetration new energy in a power system,the system's inertia tends to decrease and its strength and stability are hampered. In order to improve the stability of the system,a grid-forming converter technology which gives play to the flexibility and controllability of converters,compensates for the missing inherent inertia damping and provides reliable voltage and frequency support for the system is proposed.Based on the comparison between grid-forming control and gird-following control technologies,different network construction control strategies are analyzed. Then, the grid-forming high-pressure energy storage technology is introduced.The bottlenecks,challenges and feasible solutions of the technology are pointed out.The research results show that since the grid construction control technology can effectively improve the inertia damping,and provide the voltage and frequency support for the power system,it is promising in new power systems with high proportion of new energy and a large quantity of electronic equipment. Table and Figures | Reference | Related Articles | Metrics

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Energy storage technologies and their applications and development XUE Fu, MA Xiaoming, YOU Yanjun Integrated Intelligent Energy    2023, 45 (9): 48-58.   DOI: 10.3969/j.issn.2097-0706.2023.09.007 Abstract （1159）   HTML （49）    PDF （929KB）（3208）       Knowledge map    Energy storage is a key supportive technology for the energy revolution. In the context of carbon neutrality， the fast-growing energy storage technology is playing an increasingly important role in energy industry. Existing energy storage technologies and their development statuses are expounded， focusing on their characteristics and differences. And the application scenarios and economy of these technologies are comprehensively compared. The key to battery researches is introducing new energy storage materials to solve its non-traditional electrochemical problems. Thermochemical energy storage is suitable for long-term storage due to its low energy consumption in reversible reactions， but attention should be paid to its cyclic dynamic characteristics， modeling and cost control. Pumped energy storage and compressed air storage technology are mature technologies， which are of high storage capacity and suitable for large-scale energy storage projects. However， the two technologies are limited by siting constraints， high cost of infrastructure construction and difference in operation and maintenance costs. Flywheel energy storage technology is suitable for the scenarios in need of frequent start-up and short energy release time， but how to the reduce energy loss in conversion is the challenge. Applications of hydrogen energy is restricted by difficulties in storage and transportation and its low energy conversion efficiency. The study can provide reference for relevant researches and policy formulation. Table and Figures | Reference | Related Articles | Metrics

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Causes analysis and treatment of end shield oil leak in 500kV main transformer bushing YU Wentao，HUANG Wenfeng，MA Xin Huadian Technology    2018, 40 (2): 25-28.   Abstract （557）      PDF （1485KB）（3074）       Knowledge map    A 500kV main transformer of a power plant found oil leak defect at its bushing end shield of the high voltage side during overhaul. Through analysis, it was confirmed that the reason for oil leak was ungrounded end shield. It introduced the replacement of high voltage bushing and partial discharge test in details. After replacement, it was found that the end shied ground column was damaged during the dielectric dissipation test of transformer through disassembly check and the grounded copper sleeve was jammed and could not bounce fully. Countermeasure was carried out according to the causes of the defect. Related Articles | Metrics

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Application and comparison of SCR, SNCR and SNCR/SCR flue gas denitration technology WANG Jihua Huadian Technology    2018, 40 (6): 68-70.   Abstract （238）      PDF （789KB）（3042）       Knowledge map    The principle, layout, performance index and the engineering application of selective catalytic reduction (SCR), selective non catalytic reduction (SNCR) and SNCRSCR hybrid denitrification for coalfired power plant have been briefly presented. Comparing the three kinds of denitration technology comprehensively, three kinds of control system configuration schemes of denitrification are provided, which can provide reference for the choice of denitrification scheme and control mode. Related Articles | Metrics

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Voltage control strategy for DC microgrid based on adaptive PI controller WU Xiaotao, TAN Chao, WANG Guobo Huadian Technology    2021, 43 (9): 14-22.   DOI: 10.3969/j.issn.1674-1951.2021.09.002 Abstract （284）   HTML （1）    PDF （1762KB）（2542）       Knowledge map    Since traditional control strategies cannot balance voltage disturbance level and total harmonic distortion（THD）of power grid,a DC bus voltage control strategy based on adaptive PI controller is proposed.The control objective of the strategy is to lower the harmonic distortion rate of the grid and the voltage disturbance simultaneously,and the strategy analyzes and executes by using a dynamic simplified model of current control loops.The proposed adaptive PI controller's proportional and integral gains are self-regulating,which can decrease the voltage fluctuation level and the THD of the grid while ensuring fast response.The results show that,compared with traditional control methods,the proposed control method can boost the anti-disturbance capacity of bus voltage and lower the THD in steady state. Table and Figures | Reference | Related Articles | Metrics

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Experimental study on the effect of biological enzyme treatment on coal storage calorific value and coal pile temperature LIU Zhongxuan，NING Xinyu，CHENG Shi Huadian Technology    2019, 41 (3): 40-42.   Abstract （692）      PDF （832KB）（2507）       Knowledge map    The coal storage of the power plant coal yards is huge, and the storage period is long. Reducing the loss of calorific value and spontaneous combustion of coal during storage period can improve the economic efficiency of power plants. Through spraying  biological enzymes on the coal pile of a coal yard, the data of effect of biological enzymes treatment on largescale coal pile calorific value and temperature is obtained.The results show that the biological enzyme treatment technology has a certain effect on reducing the loss of calorific value during the coal storage period.The temperature of the treated coal pile during storage period will rise, which is not conducive to reducing the spontaneous combustion of the coal pile. Related Articles | Metrics

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Research and progress in the technique of heavy metal ions removal from waste water LIU Yangzhi1，LIU Peng2 Huadian Technology    2019, 41 (12): 31-36.   Abstract （442）      PDF （1029KB）（2362）       Knowledge map    With the rapid development of industrial technology, various pollutants are discharged into the environment. Among them, heavy metals can hardly be degraded due to their richness, which causes great harm to the environment and human body. The relevant domestic and international research methods for removing heavy metal ions from waste water  are described, and the corresponding classical theoretical results  based on various removal methods are proposed. By describing the advantages and disadvantages of various methods, a new type of water treatment adsorption material with great development prospects is introduced, and its related progress in  heavy metal ion removal is summarized. Related Articles | Metrics

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Prevention and Control of Boiler ‘Four Pipe’ Leakage ZHOU Xue-song Huadian Technology    2008, 30 (9): 9-12.   Abstract （4711）            Knowledge map    unplanned outage is one of important benchmarking content, and boiler ‘four pipe’ leakage is the main reason caused unplanned outage in thermal power plant at long time, which influences safety and stable operation of generation equipments seriously. In the 670t/h boiler of Tianjin Junliangcheng Power Generation Corporation Limited, the heating surface was arranged unreasonably, heating surface leakage was occurred frequently. Aiming at this problem, a special anti-explosion team was established, the boiler heating surface was supervised and checked during the boiler production, erection and operation. By continuous groping and improvement, a set of effective anti-abrasion, anti-explosion experiences were summarized. The application of these experiences reduces the leakage greatly, and unplanned outage was no occurred in 2006 and 2007. Related Articles | Metrics

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Status and prospect of virtual power plant technology YANG Xiaosi，TAO Xinlei，HAN Li Huadian Technology    2020, 42 (5): 73-78.   Abstract （884）      PDF （437KB）（2282）       Knowledge map    Intensive integration of information technology and energy technology is the development direction of energy industry at home and abroad. Based on modern communication technology and Internet technology，virtual power plants have broken through the geographical limitation through networks.The virtual plant integrates distributed renewable energy generation，energy storage，controllable load and other subsystems into a virtual entity to participate in transactions of the power market.And it provides capacity services and auxiliary services for the power grid，so as to improve the economy and reliability of the power system and facilitate the consumption and efficient utilization of renewable energy as well. The demonstration power plants in developed European countries and China were studied and compared from their key points， the core technologies and the practice effect.Consideration of the current situation and prospect of the energy industry in China，it is concluded that the technical route of European virtual power plants is more suitable for domestic power plants in the future，and reasonable suggestions for the key technologies and development direction of domestic virtual power plants are put forward . Related Articles | Metrics

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Selection of large capacity stepup transformer in power plant JU Zhenghao Huadian Technology    2017, 39 (2): 35-37.   Abstract （361）      PDF （712KB）（2278）       Knowledge map    This paper introduced the selection basis of large capacity stepup transformer. The comparison of three phase compacted transformer and three single phase transformers was based on negativesequence current, operation reliability, operation loss, price, transportation and other aspects. To determine the short circuit impedance, unit operation stability and voltage adjusting rate were considered as well as short circuit current. Related Articles | Metrics

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Design and dynamic performance analysis on a molten salt heat exchanger for energy storage and heating CHEN Ruizhe, XIONG Yaxuan, ZHANG Hui, LENG Guanghui, WANG Huihui Huadian Technology    2020, 42 (12): 54-59.   Abstract （329）      PDF （611KB）（2213）       Knowledge map    High-temperature molten salt heat storage is an effective solution for energy issues. Structure and design parameters of a molten salt-water heat exchanger play decisive roles in its performance. Software HTRI was taken in detailed design and selection on the molten salt-water heat exchanger with megawatt capacity. Manufacturing dimensions and rated performance parameters of the molten salt-water heat exchanger were achieved after data correction. Based on its design parameters, the exchanger's dynamic load, molten salt temperature at inlet and outlet, effective average temperature difference, steam temperature at outlet, design margin of heating area and heat transfer coefficient were simulated and calculated by controlling its water flow and molten salt flow. The calculation results show that the designed molten salt-water heat exchanger can complete 1 MW heat exchange，and its dynamic heat exchange performance is in line with the manufacturing dimensions of tube and shell heat exchangers. The reasonable design for the molten salt heat exchanger provides reliable reference for further research. Related Articles | Metrics

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Discussion about the Status of Running at Daytime and Stopping at Night Gas Turbine Generator YU Li-fan;CHENG Liang Huadian Technology    2008, 30 (9): 56-58.   Abstract （4226）            Knowledge map    The two familiar main bus connection of gas turbine generator was introduced, the prescription about generator normal status was explained, a burned-out accident of knife switch at the generator outlet and an accidental closing of generator main breaker were described. The actuation of normal generator protection device under the case of main generator beaker accidental closing was analyzed, the status of gas turbine generator, which is running at daytime and stopping at night, was discussed also. Related Articles | Metrics

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Review on water electrolysis for hydrogen production powered by fluctuating wind power and PV Leijiao GE, Qingxue CUI, Mingwei LI, Fang YAO, Xiaona YANG, Tianshuo DU Integrated Intelligent Energy    2022, 44 (5): 1-14.   DOI: 10.3969/j.issn.2097-0706.2022.05.001 Abstract （620）   HTML （20）    PDF （1559KB）（2189）       Knowledge map    Water electrolysis for hydrogen production powered by green energy such as PV and wind power is an important technical rout to realize the national energy strategy of carbon neutrality and carbon peaking. Nevertheless,the volatility of wind power and PV seriously affects the dynamic adaptability and operational reliability of the hydrogen production system based on water electrolysis. By expounding the characteristics of the hydrogen production technology powered by wind-PV complementary systems,and analyzing the mechanism and economy of this technology,an efficient and reliable technical rout of water electrolysis for hydrogen production powered by fluctuating wind power and PV is conceived,to extricate from the predicament in water electrolysis for hydrogen production. There are three key steps in the realization path, system configuration optimization, stable operation and service life extension. Targeting at the system service life management, the safe, reliable and economic operation of the water electrolysis system for hydrogen production powered by PV and wind power lays a favorable foundation for the development of wind-PV-hydrogen industry chain. Table and Figures | Reference | Related Articles | Metrics

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Thermal power plant waste water zeroemission technology proposal LIU Jin Huadian Technology    2017, 39 (9): 58-62.   Abstract （657）      PDF （881KB）（2149）       Knowledge map    To realize thermal power plant waste water zero emission, technology of desulfurization waste water preprocess, desulfurization waste water concentrated treatment and tail strong brine evaporative crystallization was compared. The propitiated proposal was selected. Postprocessed condensate water could be used as industrial water, and realized power plant water treatment system closetype circulating. There is not any water discharged. Waste water zero emission was realized. Related Articles | Metrics

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The Important Way for Energy Saving of Fan and Pump WANG Zhen-yu Huadian Technology    2008, 30 (7): 1-5.   Abstract （4202）            Knowledge map    The correct selection and use of fan and pump are the important prerequisite for raising their efficiency. Taking fan as the example the similar operation relations of fan and pump are explained, the essential conditions which must be satisfied for similarity of fan and pump were proposed, and the inevitable results of the similarity were given. The variable frequency speed regulation has become the first scheme to be selected. According to the similarity law of fan and pump, in the process of reducing speed, the efficiency of the fan and pump will be kept at the same value, and its flow rate, pressure(or delivery head) and power are reduced in proportion to speed, speed square and speed cube respectively. Related Articles | Metrics

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Calculation of ice thickness of overhead transmission lines LI Guiming Huadian Technology    2018, 40 (1): 10-12.   Abstract （367）      PDF （779KB）（2104）       Knowledge map    Through establishing icing thickness mechanical models for overhead transmission lines, the formula for calculating the ice thickness of lines and wire sag is derived. Using the formula, thickness of the ice coating of ±800kV Fufeng line in Hunan region was calculated. Comparing the calculating results with field test results, the calculation error was 9.02%. The model can be used to predict the thickness of wire ice coating in advance, and provides a preliminary warning for icing protection. Related Articles | Metrics

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Intelligent power plant integrated big data platform key technology and application analysis ZHANG Fan Huadian Technology    2017, 39 (2): 1-3.   Abstract （554）      PDF （958KB）（2094）       Knowledge map    Intelligent power plant construction is the development direction of electric power industry informatization, establish large data integration platform for power plants to produce all kinds of data processing is a key step of constructing power plants with wisdom. Per the characteristics of the electric power industry, analyze the data source and data structures, designed the special data platform architecture to deal with data and calculation of deep mining gives accurate decision support information. The platform in a coalfired power plant actual operation, the operation results show that the platform can handle power plant data and it is concluded that the correct information. Related Articles | Metrics

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Water investment and integrated energy coupling utilization and development HAN Mailiang Huadian Technology    2019, 41 (11): 66-69.   Abstract （228）      PDF （900KB）（1988）       Knowledge map    At present, environment and energy issues have got worldwide attention.While facing severe energy crisis and environmental pollution, we need to diversify the ways of energy utilization.Concerning the development direction of the whole water investment industry, the current situation of energy consumption in sewage treatment plants was analyzed, and specific countermeasures were put forward, such as fully tapping the renewable energy in sewage treatment plants, recovering and utilizing the heat and biomass of municipal sewage effectivly. Distributed photovoltaic power generation system and water source heat pump were installed.And sludge disposal and burning contributed to heating and electricity supply, which realized the  energy saving,environment protection and effective utilization of integrated energy. Related Articles | Metrics

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The Reason Analysis on Hydrogen Purity Lowering of Double-ring Oil Sealing Generator HU Xiao-hui Huadian Technology    2008, 30 (7): 14-16.   Abstract （4025）            Knowledge map    The quantity of make-up hydrogen is an important operation index of generator unit, too large quantity of hydrogen often appears in the double-ring oil sealing generator .By the analysis of the oil sealing system and the sealing bush construction, the problems and hidden troubles existing in system design and operation were treated and regulated, the speed of hydrogen purity lowering was controlled, the hydrogen exchange quantity of generator and the hydrogen consumption were reduced, so the purpose of energy-saving and consumption-reducing was achieved at last. Related Articles | Metrics