构网型逆变器与SVG并联系统无功功率协调控制策略

Coordinated Control Strategy of Reactive Power of Grid-Forming Inverter and SVG Parallel System

以静止无功发生器(static var generator,SVG)为例,针对构网型逆变器和SVG并联系统的电压稳定性问题,提出构网型逆变器与SVG并联系统无功功率协调控制策略。将并联系统的运行状态总结为四种工况,通过工况识别、无功补偿量计算、无功功率分配策略、工况切换,来协调不同工况下构网型逆变器与SVG注入公共耦合点的无功功率,使并联系统在各种情况下均可稳定可靠工作。在MATLAB中搭建模型并进行仿真,结果表明所提控制策略可以实现工况的快速识别与切换、无功补偿量的计算、无功功率的分配,以及对公共耦合点电压的快速支撑。

Taking the static var generator(SVG)as an example,this paper proposes a coordinated reactive power control strategy for grid-forming inverter and SVG parallel systems to address the voltage stability issue.Summarize the operation status of the parallel system into four working conditions,and coordinate the reactive power of the grid-forming inverter and SVG injection common coupling point under different working conditions through working condition identification,reactive power compensation calculation,reactive power allocation strategy,and working condition switching,so that the parallel system can work stably and reliably in all situations.A model is built in MATLAB and simulation is conducted.The results show that the proposed control strategy can achieve fast identification and switching of operating conditions,calculation of reactive power compensation,allocation of reactive power,and fast support for common coupling point voltage.