一种基于PQ控制的DG逆变器模型

A DG Inverter Model Based on PQ Control

摘要: 并网逆变器作为连接分布式电源与电网的纽带，对分布式电源的并网性能有关键性的影响。本文设计了一种基于PQ控制的DG逆变器模型，逆变部分选用三相桥式PWM逆变器，采用SPWM调制方法，利用KCL和KVL，对其进行数学建模，通过分析其数学模型进行逆变控制器的设计。PQ控制模块(Controller)主要由具有频率跟踪作用的SPLL与提供坐标变换的dq变换模块(SPLL/dq_transform)、能够得到参考电流dq分量(i_Ldref, i_Lqref)的功率及功率因数控制(P/Q Control)模块、以及最终能够得到6路PWM控制信号的电流控制(I Control)模块组成。仿真结果表明：本文设计的基于PQ控制的DG逆变器模型性能优良。

Abstract: Grid-connected inverter as a link between the distributed power supply and power grid, plays a key role to the distributed power supply and the network performance. In this paper, a DG inverter model based on PQ control is designed. The inverter is selected by using the three-phase bridge PWM inverter, and the KCL and KVL are used to model the mathematical model. The mathematical model is analyzed by the mathematical model so as to carry out the design of the inverter controller. PQ control module (Controller) provides the dq conversion module mainly by the frequency tracking effect of the SPLL and coordinate transformation (SPLL/dq_transform); it can get the reference current dq component (i_Ldref, i_Lqref), power and power factor control (P/Q control) module, and the final can be 6-way PWM control signal current control (I Control) module. The simulation results show that the DG inverter model based on PQ control is excellent in performance.