基于SVG的供电系统无功补偿技术研究

Research on Reactive Power Compensation Technology of Power Supply System Based on SVG

为降低供电线路及变压器的损耗,提升电压的稳定性,在对SVG构成原理及其链式结构分析的基础上,提出基于PI控制和重复控制的SVG复合控制策略,再接入闭环环节,实现实时跟踪SVG补偿及谐波电流。仿真研究表明,主电路中加入一个感性负载后,电路中存在较大的无功、负序电流;当经SVG补偿后,采用复合控制,三相电压稳定,且电源侧、负载侧的环流接近零,补偿效果好,瞬时响应速度快。

To reduce the losses of power supply lines and transformers,and improve voltage stability,based on the analysis of the principle and chain structure of SVG,a composite control strategy of SVG based on PI control and repetitive control is proposed.Then,a closed-loop loop is connected to achieve real-time tracking of SVG compensation and harmonic current.The simulation results show that when inductive load is added to the main circuit,there are large reactive power and negative sequence current in the circuit.When SVG compensation is combined with compound control,the voltage is stable,the circulation of the power side and the load side is close to 0,the compensation effect is good,and the instantaneous response speed is fast.