基于准比例谐振双闭环控制的电网模拟器逆变侧设计

针对电网模拟器逆变侧控制,传统的比例积分控制对给定电压的跟踪存在静差值、延时和振荡等问题,提出电网模拟器逆变侧电流内环、电压外环均采用准比例谐振(QPR)控制。选用了合适的电网模拟器结构,建立了单相逆变器的数学模型,采用LC滤波器,设计了QPR双闭环控制器。仿真对比传统比例积分控制,验证了准比例谐振控制器能有效的提高系统对指令电压的跟踪能力和输出电压的稳定性。基于控制器硬件在环测试(CHIL)技术搭建了电网模拟器实验平台并进行实验,验证了该控制策略的可行性。

Design of Inverter Side of Power Grid Simulator Based on Quasi-Proportional Resonant Double Closed Loop Control

In view of the inverter-side control of the grid simulator, the traditional proportional-integral control has problems such as static difference, delay and oscillation for the tracking of a given voltage. It is proposed that both the current inner loop and the voltage outer loop of the grid simulator inverter side be used QPR control. In this paper, a suitable grid simulator structure is selected, a single-phase inverter mathematical model is established, an LC filter is used, and a QPR double closed-loop controller is designed. Compared with traditional proportional-integral control, the simulation verifies that the quasi-proportional resonance controller can effectively improve the tracking ability of the system to the command voltage and the stability of the output voltage. Based on the controller hardware-in-the-loop test (CHIL) technology, a power grid simulator experimental platform was built and tested to verify the feasibility of the control strategy.