查看更多>>本刊由中国电机工程学会主办，国电信息中心承办，内容涵盖电力规划和计划、电力工业管理、方针政策、发展水平、建设和科研成就、统计数据等多方面信息，是国家电网公司和电机工程学会对外宣传我国电力工业、促进国际交流和合作的唯一英文版刊物。Electric Power Industry in China（中文名称：《中国电力工业》，年报）自1983年开始出版发行，是逐年介绍中国电力工业发展、规划及各类统计数据的重要文献，自2001年起作为《电气》第3期出版。
查看更多>>摘要：Smooth switchover of micro-grid from parallel operation mode to island operation mode is a significant method to guarantee the continuous power supply to important loads.This paper puts forward an online work mode on the basis of analyzing the features of parallel operation mode and island operation mode.According to the features of online work mode,the paper gives a fixed and unfixed DC bus voltage control strategy and builds the simulation model of unfixed DC bus voltage control strategy based on Matlab/Simulink.The simulation results show that online work mode based on the unfixed DC bus voltage control strategy can avoid the unstable problem caused by handoff process between parallel mode and island mode,ensure uninterrupted power supply for important loads,and achieve maximum power tracking of photovoltaic power generation,in addition to reducing the complexity and cost of the system.
查看更多>>摘要：Environmentally clean photovoltaic (PV) generation has found wider application,but the power fluctuation generated from PV can negatively impact the operation of power system.A properly designed energy storage system (ESS) can stabilize power system by absorbing and injecting instantaneous power.Suitable control strategy of ESS is studied in order to accommodate the power fluctuation.It adopts negative feedback which considers the relationship between real power and voltage in the distribution network because resistor is comparable to reactance of the lines in the distribution network.A universal model of ESS is established,the characteristic parameters such as time-delay of system response,limitation of charging and discharging and restraint of energy storage capacity are taken into account.The validity of the proposed model is verified by user-defined modules in power system analysis software package (PSASP).The operation of PV generation at Wuhan Railway Station in both grid-connected mode and island mode at Wuhan Railway Station is analyzed in detail.The performances of the local distribution network with PV under different weather conditions are summarized,and the key parameter of ESS suitable for PV generation at Wuhan Railway Station is also recommended.
查看更多>>摘要：Towards the analysis of the developmental situation of wind power generation and electric vehicles,a novel idea for stabilizing the fluctuation of wind farms' output by the use of battery swapping stations of electric vehicles is put forward in this paper,to effectively alleviate the impact of grid-connected operation of wind farms on the power system while promoting the field operation of charging and battery swapping stations.A battery swapping station is treated as a capacity-variable energy storage power station,connected to the output terminal of a wind farm.A combined operation model for wind farm and battery swapping station is established based on the MATLAB/SIMULINK simulation platform and the control strategy is proposed for the operation of battery swapping stations.The simulation results show that the introduction of a battery swapping station can effectively stabilize the fluctuation of wind farm output.
查看更多>>摘要：To analyze the influence of ±400 kV Qinghai-Tibet HVDC transmission system on transmissionline protections in Qinghai AC power system,a closed-loop simulation system was constructed by combing HyperSim system with HVDC control protection devices.Various faults on double-circuit 750 kV and multicircuit 330 kV AC transmission lines in Qinghai power system were simulated.The impedance characteristics and harmonic components at Qinghai side of Qing-Tibet DC transmission line were analyzed.The harmonic proportion in voltages and currents were studied for faults that took place at different locations near the DC system.The inflence of Qing-Tibet DC system on the directional components of protections,differential protections and distance protections of AC transmission lines was discussed and drew the conclusions that the DC sytem had little influence on differential protections,while had great inflence on directional components and distance protection.The conclusions can provide reference for studying the interaction between AC and DC systems.
查看更多>>摘要：This paper presents the behavior analysis of modular multilevel converter under DC pole-to-pole short-circuit fault,which is an important issue in fault management,electrical system design and MMC based power system protection and control.Firstly,the transient behavior is analyzed and the conduction overlapping angle y is defined.Secondly,seven possible short-circuit current paths induced by different y values are identified,and the corresponding engineering short-circuit current calculation methods for both AC and DC sides are proposed.And then,the influences of impedance distribution factor k and equivalent short-circuit resistance Rsc on short-circuit currents are elaborated.Finally,case study is used to verify the effectiveness of the proposed analysis methods.
查看更多>>摘要：This paper puts forward a new fault diagnosis model based on Petri net.In this new fault diagnosis method,an associated tree is first defined to describe the logic according to the protections and circuit breakers.After that a Petri net diagnosis model comes into being and the precise diagnosis of power grid elements can be realized at the same time.The simulation results given in this paper illustrate that this fault diagnosis method can make a rapid diagnosis in complex fault situation and give accurate results to power grid fault diagnosis.
查看更多>>摘要：Reliable connection of turbine generators in complex main wiring structures to the power grid through a plurality of switches is a new key problem,referred to as multipoint automatic synchronization (MPAS),in automatic control systems (ACS).In this paper,different methods of voltage-frequency and phase-difference control are analyzed,and a control methodology based on active frequency tracking (AFT) is presented.Through the establishment of the multi-point automatic synchronization model and the analysis of the governor transfer function with this control method,the important control parameters and automatic process control sequence are summarized.The correctness and effectiveness of the designed methodology are inspected through on-site testing,and the importance of the function and selection of parameters are also explored.
查看更多>>摘要：Development of a low-carbon economy and reduction of carbon emissions is the trend of future global socio-economic change,and the only way to mitigate climate change under the framework of sustainable development.Based on the concept of a low-carbon economy,the author attempts to find a way for underdeveloped regions,which can satisfy their own development without increasing the pressure on the local environment.Taking Guizhou Suiyang as an example,the solar power designed in the land application provides a low-carbon case study of underdeveloped areas to solve the issue of power supply.
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