基于虚拟阻抗控制策略的微电网功率分配研究

Research on power distribution of microgrid based on virtual impedance control strategy

针对孤岛型微电网的功率分配问题,文中提出了一种增强型微电网分布式发电(DG)虚拟阻抗控制方法。运用DG线路电流和公共耦合点(PCC)电压馈电来调节基波和谐波频率的虚拟阻抗,实现了更好的无功功率和谐波功率分配。通过减小DG装置等效谐波阻抗可以减小PCC谐波电压,无需提取基波和谐波分量即可实现精确的功率分配和PCC谐波电压补偿。通过单相微电网的实验分析,验证了所提出的虚拟阻抗控制方法的可行性。

To solve the power allocation problem of islandtype microgrid,a virtual impedance control method for enhanced microgrid distributed generation( DG) is proposed in this paper. The virtual impedance of fundamental and harmonic frequencies is regulated by using DG line current and common coupling point( PCC) voltage feeding to achieve better reactive power and harmonic power distribution.By reducing the equivalent harmonic impedance of DG device,the harmonic voltage of PCC can be reduced,and accurate power distribution and PCC can be achieved without extracting fundamental and harmonic components. The feasibility of the proposed virtual impedance control method is verified by experimental analysis of single-phase microgrid.