微电网的二次电压质量控制研究

Research on Secondary Voltage Quality Control of Microgrid

由于不对称负载的接入,使得微电网中电压质量受到了严重的影响,基于d-q坐标系,通过二次控制策略对微电网的电压质量进行控制补偿。在微电网的控制器中,本地控制器作为基本的控制,配合二次控制器实现电压、电流的输出,通过调节参数来维持微网的稳定运行。二次控制器中对电压幅值、频率、电压不平衡及功率进行控制,实现电压幅值偏差、频率偏差的消除及电压不平衡补偿和功率的均分控制。最后通过仿真实验证明所提控制策略的有效性。

Because of the access of asymmetric load,the voltage quality of the microgrid is seriously affected.Based on the coordinate system,the secondary control strategy was used to compensate the voltage quality of the microgrid.In the controller of the micrognd,the local controller was used to perform some basic control,while the secondary controller was used to realize the basic output of voltage and current,and the stable opera-tion of microgrid was maintained by adjusting the parameters.In the secondary controller,voltage amplitude,frequency,voltage unbalance and power were controlled by the proposed compensation controller,so as to real-ize the elimination of voltage amplitude deviation and frequency deviation,voltage unbalance compensation and power sharing control.Finally,the simulation experiment proves the effectiveness of the proposed strategy.