含非同步机电源交流电网暂态稳定性的电磁暂态仿真研究  

Electromagnetic transient simulation study on transient stability of AC power gridwith non-synchronous machine sources

作　　者：李晓栋 徐政[1] 张哲任[1] LI Xiaodong;XU Zheng;ZHANG Zheren(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《电力自动化设备》2020年第9期57-63,共7页Electric Power Automation Equipment

摘　　要：随着非化石能源占一次能源比重和电能占终端能源比重的大幅度提升,大量非同步机电源通过电力电子换流器并网,导致同步机电源在电网中的主导地位被打破,使原本复杂的电力系统稳定性问题变得更加复杂。针对包含非同步机电源的交流电网的暂态稳定性问题,基于电磁暂态仿真软件PSCAD/EMTDC,在2区域4机系统中,通过逐步等容量替换同步机电源,仿真研究分析了交流系统临界清除时间随非同步机电源比例、非同步机电源同步机制、非同步机电源并网位置、故障类型和故障位置5个影响因素的变化趋势。仿真结果表明,随着系统中非同步机电源占比的增加,系统的暂态稳定性逐渐增强。当系统中非同步机电源占比相同时,非同步机电源分散并网可以同时增强所在区域的暂态稳定性;在非同步机电源占主导的交流电网遭受故障时,暂态响应快,故障恢复时间短,不会表现出同步机电源的功角特性。With the increase of the proportion of both non-fossil energy in primary energy and electric energy in terminal energy,a large number of non-synchronous machine sources are connected to AC power grid through power electronic converters,which breaks the dominant position of synchronous machine sources in power grid,and makes the original complex power system stability problem more complex.In view of the transient stability problem of the AC power grid with non-synchronous machine sources,based on the elec⁃tromagnetic transient simulation soft PSCAD/EMTDC,in the two-area four-machine system,by gradually replacing the synchronous machine sources with equal capacity,the trend of the critical clearing time of the AC system with five influence factors,such as the proportion of the non-synchronous machine sources,the control mode of the non-synchronous machine sources,the position of the non-synchronous machine sources connected to the power grid,the fault type and the fault position,is analyzed by simulation.The simulative results show that with the increase of the proportion of non-synchronous machine sources,the transient sta⁃bility of the system is gradually enhanced.When the proportion of non-synchronous machine sources in sys⁃tem is same,the distributed grid connection of non-synchronous machine sources can improve the transient stability of their connected area at the same time.When the AC power grid dominated by non-synchronous machine sources suffers from faults,the transient response is quick,the fault recovery time is short,and the power-angle characteristic of synchronous machine sources is not shown.

关 键 词：非同步机电源 暂态稳定性 2区域4机系统 临界清除时间 功率同步控制 

分 类 号：TM712[电气工程—电力系统及自动化]