基于d,q坐标系的微电网电压不平衡研究

摘要

The voltage quality of distributed generation is seriously affected due to the asymmetry of the load connected to the distributed power supply.A voltage quality control strategy is proposed,to compensate the output unbalance voltage for the distributed generators,this method separate of positive and negative sequence of unbalanced signals through delayed signal cancellation,and achieve power sharing to plus virtual impedance droop controllers;making unbalance compensation controller in d,q coordinate frame to achieve automatic compensation voltage stability;through the voltage and current double-loop control,to further control parameters for tracking and real-time correction,and improve the performance of the entire control system.Finally,the simulation results demonstrate the effectiveness of the proposed control strategy.%由于分布式电源所接负载的不对称,使得分布式电源的电压质量受到严重影响.故在此提出一种电压质量控制策略,对分布式电源输出电压进行不平衡补偿,该方法通过信号延迟法对不平衡信号进行正负序提取;采用加虚拟阻抗的下垂控制器实现分布式电源的功率均分;利用d,g坐标系下的不平衡补偿控制器,实现电压的自动补偿稳定;通过电压电流双环控制,进一步实现控制参数的跟踪和实时修正,从而提升整个控制系统的性能.最后通过仿真实验结果证明了所提控制策略的有效性.