基于广义积分器的DVR控制策略研究

针对动态电压恢复器（DVR）电压跟踪控制，将广义积分器引入DVR中，克服了传统PI控制器的缺点，实现了电压无差跟踪控制。为了得到良好的补偿效果，采用电容电流内环、电压外环控制的双环控制策略，在推导出系统传递函数的基础上，用Bode图分析了系统对参考电压的跟踪性能以及对负载电流扰动的抑制。实验结果验证了控制策略的有效性和鲁棒性。

Control Strategy of Dynamic Voltage Restorer with Generalized Integrator

The zero-error-control of dynamic voltage restorer （DVR） which overcomes the drawback of the PI integrator was achieved with the introduction of a generalized integrator for the voltage tracking control. A double-loop control algorithm in which the capacitor current inner-loop voltage is controlled by the outer-loop controller is adopted to get a good performance. The characteristic of the controller is analyzed by the aid of Bode of an accurate model on the basis of the deduced transfer function of the system. The robustness of the system is enhanced for load disturbances. The experimental resuits indicate that the control strateg is effective and. robust.