微电网动态电压恢复器控制补偿策略研究

Research on Micro-grid Dynamic Voltage Restorer Control Compensation Strategy

针对微电网中由于光伏、风力条件的不确定性,输出的电压跌落频率较高的问题,为减少对设备的损坏,保证电压的输出质量,作为保护的动态电压恢复器(DVR),采用负载电压外环、电容电流内环的双闭环控制,可提高输出电压的精度、系统阻尼性能以及负载适应能力。在补偿策略上,在不同情况下分别采用全相补偿和最小能量补偿法,以最终达到最满意的补偿效果。在理论分析基础上,通过Matlab仿真对上述方法进行验证,结果验证了该方法的可行性和有效性。

Because of the uncertainty of the photovoltaic and the wind conditions in Micro-grid, the frequency of the voltage sags is high. In order to reduce damage to the equipment and ensure the quality of the output voltage, the dynamic voltage restorer （DVR）is used in the system. It is effectively used in mitigating voltage sags. The controller of DVR is a core. Its performances play a key role in DVR with excellent functions. Therefore, the control strategy using the load voltage and capacitor current double closed-loop feedback control is proposed. The accuracy of the output voltage, the damping performance and load capacity are improved. The full phase compensation and minimum energy compensation method are used in different situation in compensation strategy. Finally, the system is simulated on the basis of theoretical analysis in Matlab. The result show the feasibility and effectiveness of the method.