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Table of Content
25 April 2014, Volume 36 Issue 4
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Some critical problems in integrated design of natural gas distributed energy station system
YANG Yong，YU Xiuyan
2014, 36(4): 1-4.
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Abstract:In order to improve the energy multipurpose utilization rate and the economic efficiency of the natural gas distributed energy station system, the problems in system integrated design process, such as the load statistics and analysis, the selection of main machine devices, the selection of peak shaving equipment, the electric power input and output transmission, the temperature of flue gas of the system and others, were analyzed and summarized. The result in this paper can be used as reference for integrated design of distributed energy station system.
Analysis on water supply scheme of cooling water for refrigeration station of distributed combined cooling heating and power supply system
YU Yao, MENG Xueqiao, YANG Zhu, YANG Ling, SONG Hongtao
2014, 36(4): 5-8.
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Abstract:Combining with the project of Hunan Huadian Xiangtan Jiuhua Distributed Energy Station, according to the installed parameters of the Lithium Bromide unit in refrigeration station, three representative water supply schemes of cooling water for refrigeration station were proposed and compared with each other. The conclusion is that the secondary scheme is advantageous in the total project investment, the rationality of spatial arrangement and the future extension of the refrigeration station.
Analysis on operation economy of power units of Baozhusi Hydropower Plant and optimization
TIAN Ming
2014, 36(4): 9-12.
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Abstract:Aiming at the practical situation of Huadian Sichuan Baozhusi Hydropower Plant, the factors influencing on operation economic efficiency of the units were analyzed. The water consumption rate, the executed price of electricity, the operation mode of the auxiliary power, the operation mode of the units and management were considered, and the measures for improving unit operation economy were summarized. After optimization, the operation economical efficiency of the units was improved effectively.
Development and application of lignite blending and costbenefit analysis operating system
WANG Liang
2014, 36(4): 13-16.
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Abstract:The main design idea and technology roadmap of the lignite blending and costbenefit analysis operating system were introduced. Through the system, the collected lignite management messages can be transferred into the mastercontrol room, and there the messages are used to help the production personnel to analyze the operation condition, the production cost and technical indexes comprehensively and to adjust the lignite blending ratio rationally. So the unit operation was optimized, and the best lignite blending scheme was obtained to help the power generation enterprise to obtain maximum economical benefit.
Analysis on reformation of backwater recovery device of sealing water for feed pump of 135MW turbine
GONG Shilu
2014, 36(4): 17-18.
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Abstract:Taking the 135MW unit of Huadian Xinzhou Guangyu Coal and Power Company Limited as example, the problems existing in the spiral sealing structure adopted in shaft end seal of the feed pump set were introduced. A targeted reformation scheme was proposed, and the application scope of the scheme was given. The economical benefit and the social effects of the reformation were analyzed, and the result in this paper shows that the scheme has good promotion prospects.
Intelligent power grid model under visual angle of RDF Semantic Web
ZHAO Junfeng 1,ZHUANG Zheyin 1,CHENG Yiqing 1,KAN Jianfei 2,DING Songtao 2
2014, 36(4): 19-21.
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Abstract:The basic conception of resource description framework (RDF) was introduced. The application the RDF Semantic Web model was expounded. The RDF overcomes the defects of the old storage mode and can realize message exchange between different application programs. In reformation process of the traditional information system of power distribution grid, the RDF is used to express the message exchange model of the power distribution grid resource. A data representation model based on RDF was proposed, and using the model, the related semantic model exchange in intelligent power grid can be realized and applied.
Study on prediction model of rollover accident of large LNG storage tank
SONG Danpeng 1，DU Shucheng 2，LI Zhaoci 3， SUN Heng 3
2014, 36(4): 22-23.
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Abstract:In storage process of LNG in large LNG storage tank, the stratification of filled LNG in the tank is the direct reason causing “rollover accident”. Taking the “rollover accident” of an Italian LNG storage tank as example, according to existing research model, it is believed that there is a transition layer between the upper layer and the under layer. Using the correlation of the naturalconvection heat transfer in large space, a method to calculate the heat and mass transferred through the interface was proposed. By programming calculation, the variation curves of density, temperature and components of the LNG in upper and under layers over time were obtained. The curves were analyzed, and the analysis result shows that when the densities of the upper and under layers are nearly equal, there is certain temperature difference between the upper a under layers, and the rollover accident may occur under this condition.
Development and implementation of data identification function of smart substation
LI Jingxia, ZHONG Yun, SHI Guangde, CHEN Qi
2014, 36(4): 24-26.
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Abstract:The data identification function of smart substation was introduced. The collected panoramic data, such as the bus power balance, the uniformity of paralleled bus voltages and the balance of each side power of the transformer, were detected. The data were analyzed and arranged to identify bad data. The detect result shows that the data identification function can meet the actual needs of integrated monitoring of the smart substation.
The research of static reactive power compensation device based on modularized multilevel converter
ZHENG Binhao
2014, 36(4): 27-29.
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Abstract:The basic principle of the modularized multilevel converter was introduced, and its mathematic model was deduced. Aiming at the application of the modularized multilevel converter in the static reactive power compensation device with mediumhigh voltage level, an algorithm of nearest level modulation and voltage sharing strategy of submodule based on bridge arm current direction were put forward. Aiming at the close coupling and nonlinear characteristics of the static reactive power compensation device, the dq feedforward decoupling method was adopted to realize the reactive power and DC voltage decoupling control. A detail simulation model with 71 levels was established on PSCAD/EMTDC software platform, and the effectiveness of the modulation and control strategy was verified by the simulation result.
Combined secondary equipment scheme for indoor intelligent substation and study on key technology
PAN Yong 1, YUAN Difei 2, MEI Yucheng 2, JI Dongfang 2, GU Jinshu 2
2014, 36(4): 30-33.
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Abstract:The deficiencies of the indoor intelligent substation in realization of assembly type construction were pointed out. The production construction mode of combined secondary equipment is proposed. The integrated grounding scheme of the secondary equipotential grounding network and the main grounding network in combined secondary equipment is introduced. The mechanical analysis for hoisting loading of combined secondary equipment was carried out, and the reliability of the equipment intensity was verified from both stress and deformation. The prefab optical cable with double prefabricated ends is adopted to replace the traditional site welding process. The prefab electric cable with double prefabricated ends is adopted to replace the traditional site stripping and crimping process. The efficiency of site wiring was improved greatly, and the plugand play of secondary equipment was realized.
Research on application of injection type stator grounding protection in Asahan Hydropower Station
ZHANG Richeng, ZHOU Fanghua
2014, 36(4): 34-37.
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Abstract:The principle and the composition of the injection type stator grounding protection of Asahan First Stage Hydropower Station in Indonesia were introduced. The stator grounding protection of the hydropower station tripped several times since the hydropower station was put into operation. The protection tripping behavior was analyzed. The problems, which deserve research and attention in practical application of the injection type stator grounding protection, were pointed out, and the matters needing attention in design, construction and operation of the injection type stator grounding protection were expounded emphatically.
Application status of wearresistant and anticorrosion material used in equipments of coalfired power plant and expectation
FENG Wei
2014, 36(4): 38-40.
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Abstract:The basic situation of failure of equipments in coalfired power plant caused by wear and corrosion in operation process was expounded.The service condition of large key equipments and the wear and corrosion mechanism were analyzed. The application status of material for quickwear parts of key equipments was introduced. The application prospect of the wearresistant and anticorrosion materials was predicted. The result in this paper shows that the application of novel material and remanufacturing technology is of profound significance for energy conservation, consumption reduction, environment protection and development of environment economy.
(1.Hebei Electric Power Corporation Electric Power Research Institute, Shijiazhuang 050021, China; 2.Hebei Electric Power Construction First Engineering Company，Shijiazhuang 050025, China)
LI Changsong 1, TANG Guangtong 1, NAN Weiliang 1, LIU Yongping 2, WANG Zhe 1
2014, 36(4): 41-44.
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Abstract:In debugging process of the 600MW steam turbine oil system of a newly-built power plant, several faults occurred, which include that the unit tripped after shutdown of highpressure startup oil pump, the lubricating oil pressure dropped too much in interlock test of AC oil pump and DC oil pump, the turning gear of the jacking oil system disconnected, the sealing oil entered into inside generator, the sealing oil differential pressure valve damaged, the temperature of highpressure fire resistant oil was too high and others. The faults were analyzed and treated, and better effects were obtained.
Process of valve setting in digital electrohydraulic control system debugging and experience analysis
ZHAO Weigang1, HUANG Xiang2, WANG Chuangbo1
2014, 36(4): 45-46.
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Abstract:At present, the large and medium steam turbines are all controlled by digital electrohydraulic (DEH) control system,the setting of admission valves is important step of DEH debugging. The valve setting process of DEH control system was expounded, summarized the problems in DEH debugging should be noted, some corresponding measures were put forward.
Remodeling of skew board of skew board sedimentation basin in water purification station
XIA Wenwu
2014, 36(4): 47-48.
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Abstract:Taking Guangdong Huizhou LNG Power Generation Company Limited as example, the problems existing in 2×700t/h skew board sedimentation basin of the water purification station of project phase I were analyzed. After the novel skew board and novel snapin connection mode were applied, the water purification station returns to safe, stable and economical operating state.
Analysis on key points of MPS mediumspeed roller coal mill erection process and control measures
ZHANG Junpei
2014, 36(4): 49-52.
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Abstract:The basic structure of MPS mediumspeed roller coal mill was introduced. The key points of the erection process of the mill were analyzed. The control methods of the parts, such as the base, the bottom board, the reduction gear, the lower frame and the sealing ring, were expounded, and the safe and stable operation of the mill was ensured.
Analysis and conclusion of large area blackout accident in Shenzhen Power Grid
ZHENG Gang
2014, 36(4): 53-56.
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Abstract:The “4·10” large area blackout accident of Shenzhen Power Grid at 2012 is the blackout accident in Guangdong province with largest load loss in recent years. The occurrence of the large area blackout accident and the treating process of dispatch department were introduced, and the main reasons of the large area blackout accident were summarized, which are combined failures of the equipments in the same substation within a short time and irrational bus connection in the hub substation. Considering dispatching, operation, power grid planning and power grid management, the measures and suggestions were proposed to avoid similar accident.
Analysis on reasons caused tripping of generator reverse power protection of S109FA combined cycle unit
WU Fan
2014, 36(4): 57-60.
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Abstract:The generator reverse power protection of S109FA gassteam combined cycle unit of Hangzhou Huadian Banshan Power Generation Company Limited tripped several times. The reasons triggered the protection tripping were analyzed. The solution was proposed, which provides reference for other S109FA units to treat similar problems.
Analysis on measures to ensure reliability and economical efficiency of emergency power generation unit
YOU Weiqiang, LAN Zhifang, LIU Qinglong
2014, 36(4): 61-62.
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Abstract:Under the situation of market economy, affected by national police of new energy development and energy conservation and emission reduction, the medium and small thermal power units and the inland power units far away from coal mine, which have poor competitiveness, may be closed down and obsoleted. To become the emergency reserved power generation capacity of the power grid to improve the antirisk capacity of the grid is feasible option of above power enterprises to ensure self survival. The measures to ensure the reliability and economic efficiency of the emergency reserved power generation units were given, which can be used as reference for these power units in role transition.
Analysis on false tripping of temperature protection caused by Pt100 thermistor measurement circuit and prevention
ZHAO Dongdong, FU Hao
2014, 36(4): 63-64.
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Abstract:The temperature variation regularity and measuring principle of thermal resistance were introduced, the features of the thermistor measurement circuit were analyzed. the result in this paper advanced the improved step for preventing false tripping of the temperature protection circuit using the thermistor as primary element.
Structure of mechanical seal Quickloc of AP1000 nuclear power unit and assembly and disassembly process
WANG Peiyuan
2014, 36(4): 65-68.
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Abstract:The structure of the mechanical seal Quickloc of AP1000 nuclear power unit was introduced. The assembly and disassembly process of the mechanical seal Quickloc was expounded. The problems that may occur in assembly and disassembly process were analyzed. Some effective measures were adopted, and the problems were solved.
Modeling and simulation of threephase gridconnected photovoltaic power system based on software Matlab
PEI Jinnan 1, FU Lisi 1, REN Long 2, WU Shuo 3
2014, 36(4): 69-72.
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Abstract:Based on Matlab software platform, a photovoltaic cell model suitable to engineering calculation was established. The conductance increment method was used to realize the maximum power point tracking. The constant power control method (PQ) was used to control the inverter. Based on these, a complete operation and control model of the gridconnected photovoltaic power system was established. The simulation result shows that the model can reflect the operation characteristics of threephase gridconnected photovoltaic power system better and can track the dynamic output of the system, which is helpful to ensure the photovoltaic gridconnected power system to operate stably.
Test program of differential protection for generator and transformer of AP1000 nuclear power unit
WEN Tao
2014, 36(4): 73-76.
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Abstract:Taking the unit No.1 of Sanmen Nuclear Power Company Limited as background, a test program of differential protection for generator and transformer of AP1000 unclear power unit was proposed. Considering that the current of the main transformer is limited by the load of the plant in preliminary stage, the suggested solution is to use the starting current of the mediumvoltage motor to test the correctness of the differential protection. In order to satisfy the test requirement, the current transformer in high voltage side of the house service transformer was compared with the current transformer in outlet of the generator (the generator outlet breaker is included). The rationality of the test program was verified by the calculation and comparison.
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