含多感应电动机负荷的微网电压稳定性仿真分析  

Simulation and Analysis of Voltage Stability for Microgrid with Multiple Induction Motor Loads

作　　者：林莉[1] 朱丽云[1] 张向伍[2] 刘自伟[1] 林斌[1] LIN Li ZHU Liyun ZHANG Xiangwu LIU Ziwei LIN Binl(State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology （Chongqing University）, Chongqing 400044, China State Grid Nanyang Power Supply Company, Nanyang 473000, China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市400044 [2]国网南阳供电公司,河南省南阳市473000

出　　处：《电力系统自动化》2017年第8期78-83,共6页Automation of Electric Power Systems

基　　金：中央高校基本科研业务费专项资金资助项目(CDJZR12150024)~~

摘　　要：微网中含大量高度非线性的感应电动机负荷,对微网孤岛运行时的电压稳定性构成严重威胁。为此,针对含多感应电动机负荷的微网,根据电力系统功率平衡的原则,从理论上推导了微网各电动机负荷转差与系统电压的动态耦合关系,进而说明感应电动机负荷更加敏感的原因及多感应电动机负荷的转差和系统电压之间的动态耦合特性与微网稳定性相关。基于MATLAB/Simulink仿真平台,搭建了风光柴储多源主从控制微网,通过仿真研究了不同条件下多机叠加启动及微网故障两种情况下微网的电压稳定性,进而提出了提高含多感应电动机负荷的微网电压稳定性的措施。仿真结果表明,多感应电动机负荷之间的相互作用对微网电压稳定性具有重大影响,且串联主从微网的临界故障清除时间受三相短路故障点离感应电动机负荷点的距离和故障点离主控单元的距离双重制约,采用叠加启动策略和故障点快速切机等措施可有效提高微网电压稳定性。所得结论为含多感应电动机负荷的微网稳定性研究与控制提供了理论参考。The voltage stability of islanding microgrid can be seriously subjected to high penetration level of highly-nonlinear induction motor （IM） loads. For this reason, according to the principle of power balance in power systems, the dynamic coupling relation between the system voltage and motor slips is deduced in theory for the microgrid with multiple IM loads. And the reason the induction motor load is more sensitive and the dynamic coupling characteristics of ]M load slips and system voltage are related to microgrid stability is given. A microgrid with master-slave control scheme is developed in MATLAB/ Simulink environment, including wind turbine generator, photovoltaic, diesel synchronous generator and the energy storage device. On this basis, the voltage stability of microgrid is studied on both multiple induction motors superposition starting under different conditions and fault conditions. Then measures are proposed to improve the voltage stability of microgrid with multiple IM loads. The research results show that the interaction among multiple induction motors has significant impact on the voltage stability of the microgrid. Moreover, the critical fault clearing time of tandem microgrid with master-slave control is doubly restricted by the distance from three phase short-circuit fault point to the point of IM loads and the point of main control unit. In addition, the strategies of superimposed starting and fault point load shedding can significantly improve the voltage stability of the microgrid. Conclusions have provided a theoretical basis for stability and control studies of multi-source microgrid with IM loads.

关 键 词：微网(微电网) 感应电动机 电压稳定性 叠加启动 临界故障清除时间 

分 类 号：TM346[电气工程—电机] TM712