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微电网中负载与电源类型多样,电能质量指标可能会不满足要求,为此提出了利用逆变型分布式电源(inverter interfaced distributed generator,IIDG)控制微电网电能质量的方法。检测IIDG接入点母线上的电压和微电网提供的三相电流,根据其派克变换结果调整逆变器的输出电流,使微电网仅提供负载所需的基波正序有功电流;同时检测并调整IIDG直流侧的电容电压,实现对系统有功功率输出的闭环控制。算例结果表明该方法在补偿无功、降低电压不平衡度和谐波畸变率等方面性能良好。
In the microgrid, the types of loads and power sources are diverse, and the power quality indicators may not meet the requirements. Therefore, a method of controlling the power quality of the microgrid using an inverter interfaced distributed generator (IIDG) is proposed. Detecting the voltage on the IIDG access point bus and the three-phase current provided by the microgrid, and adjusting the output current of the inverter according to the Parker transformation result so that the microgrid only provides the fundamental positive sequence active current required by the load; meanwhile, Adjust the capacitor voltage on the DC side of IIDG to realize the closed-loop control of the active power output of the system. The results show that the method has good performance in reactive power compensation, voltage unbalance reduction and harmonic distortion.