SVC和SSSC联合改善风电场暂态电压稳定性的研究  

Study on Improving the Transient Voltage Stability of the Wind Farm by SVC and SSSC

作　　者：李娟[1] 张乘 周建[1] 李学良[1] 孟超[1] 李强[1] 庄海军[1] LI Juan ZHANG Cheng ZHOU Jian LI Xue-liang MENG Chao LI Qiang ZHUANG Hai-jun(School of Electrical Engineering, Northeast Dianli University, Jilin 132012, China)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012

出　　处：《电气开关》2017年第1期36-40,44,共6页Electric Switchgear

摘　　要：分析了影响风电场暂态电压稳定性的原因,即当系统发生短路故障,电压下降,而异步电机发出有功功率的同时又会从电网吸收无功功率,造成风电机组机端电压降落的更严重,系统失去稳定。针对这一原因提出了应用静止无功补偿器(SVC)和静止同步串联补偿器(SSSC)进行联合,利用SSSC减小短路电流,降低故障期间母线电压下降的程度,故障切除后,利用SVC进行无功补偿,提高风电场的暂态电压稳定性。分别给出了SVC和SSSC的工作特性,在Matlab/Simulink中搭建了风电场和相关模型,通过仿真计算验证了SVC和SSSC对于提高风电场暂态电压稳定性的作用。结果表明:SVC能够连续平滑的对系统提供无功补偿,维持系统的暂态稳定;当发生严重短路故障时,SSSC和SVC联合,能够有效地减小故障电流,恢复机端电压;SVC和SSSC的共同作用能解决风电场的暂态电压稳定问题。This paper analyzes the reasons for influencing the transient voltage stability of the wind farm, when the system arises fault situation, the voltage will decline, and when the asynchronous generator emits active power, it will absorbs reactive power from the grid and causes the terminal voltage of the wind turbine generator to decline, the system losts stability. For this reason the paper proposes that joint static var compensator（SVC） and static synchronous series compensator（SSSC） for compensation, using SSSC to reduce the short-circuit current, reduce the voltage drop of the fault period, after the fault situation,using SVC to reactive power compensation to improve the transient voltage stability of the wind farm. The working characteristic of SVC and SSSC is given and the related structure model of the wind farm power system is built in Matlab/Simulink. The contributions of SVC and SSSC to transient voltage stability of the asynchronous wind farm and power grid are verified by the simulation. The results showed that：SVC can compensate reactive power to the system continuously and maintain the system transient stability;When a serious short circuit fault happens, SVC and SSSC can effectively suppress the fault current, recover the terminal voltage of generator; SVC and SSSC can work together to solve the problem of the transient voltage stability of the wind farm.

关 键 词：静止无功补偿器 静止同步串联补偿器 风电场 暂态电压稳定 限制故障电流 

分 类 号：TM71[电气工程—电力系统及自动化]