摘要
电动机类负荷在电网故障时吸收无功迅速增加,严重影响输电系统的电压稳定,动态无功补偿装置可根据系统需求快速输出可调无功,提高输电系统暂态稳定性。本文对静止无功补偿装置SVC和静止同步补偿装置链式STATCOM的补偿原理和运行特性进行了深入对比分析,同时详细阐述了电动机类负荷的无功电压特性。基于Matlab/Simulink搭建了系统级仿真模型,仿真结果指出链式STATCOM无功电流输出能力不受系统电压限制,无功输出能力优于SVC,且分相控制策略可增强其适应系统不对称故障运行的能力。
Induction motor load will absorb more reactive power during grid fault, which seriously affects the stability of the system voltage. Dynamic reactive power compensation device can provide adjustable reactive power according to system requirement and improve system transient stability. A comparative analysis of the compensation principle and operational characteristics between SVC and Cascade STATCOM is presented in this paper, and the reactive-voltage characteristic of motor load is elaborated. System simulation model is built based on MATLAB/Simulink. Simulation results shows that Cascaded STATCOM provides more reactive power than SVC, as its output current is not limited by system voltage and the single-phase control strategy enhances its ability to adapt the system asymmetric fault.
出处
《电测与仪表》
北大核心
2013年第1期56-61,共6页
Electrical Measurement & Instrumentation
