基于VSG的光伏并网准Z源逆变器控制

Control of Photovoltaic Grid Connected Quasi-Z Source Inverter Based on VSG

针对光伏并网系统导致电网总体惯量减小问题,本文提出了一种基于虚拟同步发电机方法的准Z源逆变器(QZ-VSG)并网控制结构,该方案将准Z源逆变器与虚拟同步发电机技术相结合,提高了系统的稳定性。虚拟同步发电机的控制策略引入了转动惯量和阻尼系数的特性,使虚拟同步发电机的准Z源逆变器结构能够在功率波动下提供更好的动态性能,其仿真结果验证了控制策略的可行性。

Aiming at the problem that the PV grid connected system reduces the overall inertia of the power grid,this paper proposes a grid connected control structure of quasi Z-source inverter(QZ-VSG)based on tke virtual synchronous generator method.This scheme combines the quasi Z-source inverter with the virtual synchronous generator technology,which can improve the stability of the system.The control strategy of virtual synchronous generator introduces the characteristics of moment of inertia and damping coefficient,so that the quasi Z-source inverter structure of virtual synchronous generator can provide better dynamic performance under power fluctuation.The simulation results verify the feasibility of the control strategy.