微电网的电压质量控制方法

摘要

To solve the voltage quality problems caused by unbalanced load access and improve the voltage quality at thepoint of common coupling for microgrid,a secondary control method for voltage quality is proposed in this paper. Based on an αβ coordinate system,the voltage,frequency,and power of microgrid are compensated and corrected us?ing a hierarchical control strategy.The basic parameters of microgrid are tracked and controlled by the primary control, and the stable operation of microgrid is maintained by adjusting those parameters.The secondary controlis used for cor?recting the voltage amplitude,frequency,and reactive power deviation of microgrid,respectively,as well as for the com?pensation and sharing of unbalanced voltage and power.Finally,the verification of the simulation model proves that the proposed control method can improve the voltage quality effectively.%为了解决由于不平衡负载的接入而引起的电压质量问题,从而使微电网公共耦合点的电压质量得到改善,提出了电压质量的二次控制方法.基于αβ坐标系,采用分层控制策略,对微电网的电压、频率、功率进行补偿与修正.采用分层控制中的一次控制对微电网的基本参数进行跟踪与控制,通过调节参数来维持微电网的稳定运行.采用二次控制分别对微电网电压幅值、频率及无功功率偏差进行修正,并对不平衡电压和功率进行补偿与均分.最后通过仿真模型的验证,证明所提控制方法能很好地对电压质量进行改善.