VSC-HVDC适应感应电动机负荷稳定性研究  

Study on load stability of VSC-HVDC for induction motor

作　　者：郑勇 罗雍溢 曾琦[2] 秦浩庭 李文帆 雷宇 Zheng Yong;Luo Yongyi;Zeng Qi;Qin Haoting;Li Wenfan;Lei Yu(Southwest Electric Power Design Institute Co.,Ltd.,Chengdu 610021,China;School of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]西南电力设计院有限公司,成都610021 [2]四川大学电气工程学院,成都610065

出　　处：《电测与仪表》2020年第4期7-14,共8页Electrical Measurement & Instrumentation

基　　金：国家电网有限公司科技项目资助(SGCQJB00FZJS1800954)。

摘　　要：日益增长电网负荷中心含有的感应电动机负荷,因其高度非线性和动态特性,给电力系统带来严重的电压失稳甚至崩溃的风险。文章通过研究感应电动机负荷特性,分析其与电力系统稳定的关联性。同时基于柔性直流系统功率传输可控特性,研究了一种柔直紧急支援控制策略,通过适当改变控制指令值调节交直流线路间的交换功率,从而实现负荷以及系统的稳定。最后通过PSCAD/EMTDC平台搭建某城市局部交直流系统模型,针对不同感应电动机负荷比例进行仿真分析。经验证,柔性直流系统采用该控制策略能有效提升电网感应电动机负荷稳定水平。Induction motor load,which is contained in the growing load center of power grid,brings serious risk of voltage instability and even collapse to power system due to its highly nonlinear and dynamic characteristics.This paper analyzes the relationship between induction motors and power system stability by studying the load characteristics of induction motors.Meanwhile,based on the controllable characteristics of power transmission in flexible DC system,a flexible emergency support control strategy is studied.The switching power between AC and DC lines is adjusted by changing the control command value appropriately,so as to realize load and system stability.Finally,a local AC/DC system model of a city is built on the platform of PSCAD/EMTDC,and the simulation analysis is carried out for different load ratios of induction motors.It is proved that the control strategy of flexible DC system can effectively improve the load stability level of induction motor in power grid.

关 键 词：VSC-HVDC 感应电动机 负荷模型 电压稳定 

分 类 号：TM933[电气工程—电力电子与电力传动]