基于QPCI控制的微电网并网逆变器控制技术研究

为了保证微电网中并网逆变器在基频附近也具有较好的动稳态特性，提出一种准比例复数积分（QPCI）控制策略。首先结合单相并网逆变器数学模型进行静稳态理论分析；其次采用延时法虚拟坐标系和全通滤波器实现基于QPCI控制的单相并网逆变器的直接电流控制；对2种控制方案进行对比，发现采用全通滤波器实现QPCI控制简单易行。最后通过仿真和实验进行有效性验证，结果表明QPCI控制的单相并网逆变器在基频附近具有良好的静稳态性能。

Single-phase Grid-connected Inverter Control Technology for Microgrid Based on QPCI Control

In order to ensure that the grid-connected inverter in microgrid has better dynamic and steady-state characteristics near the fundamental frequency， this paper proposes a new control strategy based on quasi-proportional complex integral. Firstly， the static and steady state theory analysis is carried out by using the mathematical model of single-phase grid-connected inverter. Secondly， two control schemes using delay virtual coordinate system and all-pass filter is used to realize the direct current control of the single-phase grid-connected inverter based on QPCI control. After comparing the two schemes， it is found that the realization of single-phase QPCI control using the all-pass filter is simple and feasible. Finally， the simulation and experiment shows that the single-phase grid-connected inverter based on QPCI control has good steady performance near the fundamental frequency.