摘要
将静止同步补偿器(Static Synchronous Compensator,STATCOM)并入电网来补偿无功功率和配电网三相负荷不平衡。通过对称分量法和叠加原理,对配电网三相负荷不平衡情况下正序、负序等效电路进行分析,提出一种新的正、负序补偿电流叠加补偿控制方法。正序控制环采用δ-θ控制,实现配电网无功功率补偿和保持STATCOM直流侧电压稳定;负序控制环采用φ-θ控制,实现STATCOM补偿三相负荷不平衡产生的负序电流,使电网侧三相负荷保持平衡。仿真和实验结果表明,该方法可以有效地补偿电网无功功率和三相负荷不平衡。
A static synchronous compensator （STATCOM） is used into distribution grid for compensating reactive power and three- phase unbalance load for the distribution grid. According to analyzing the positive sequence equivalent circuit and negative sequence equivalent circuit under the three-phase unbalance load of distribution grid, using the symmetrical component method and superposition principle, a new cascade loop control strategy of positive sequence current and negative sequence current is proposed. Usingδ-θ control, the positive sequence loop compensates reactive power of distribution grid and maintains stability of STATCOM DC voltage. Usingφ-θ control in the negative sequence loop can make STATCOM compensate negative-sequence current caused by three-phase load unbalance and keep distribution grid side three-phase load balanced. Simulation and experiment results are presented to verify the validity of the proposed control strategy. This work is supported by National Natural Science Foundation of China （No. 51377016）.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2014年第14期72-78,共7页
Power System Protection and Control
基金
国家自然科学基金项目(51377016)~~
关键词
电力系统
无功补偿
静止同步补偿器
负荷不平衡
对称分量法
叠加原理
power system
reactive power compensation
static synchronous compensator
unbalance load
symmetrical component method
principle of superposition
