基于准PR控制的逆变器优化控制

逆变器并网控制过程中往往利用比例积分（PI）控制器追踪信号，然而在正弦电流信号的追踪过程中往往由于冲击性负载的作用，给系统带来稳定性误差和系统扰动等问题，本文提出了一种基于比例谐振（PR）控制技术的准比例谐振（PR）逆变器优化控制策略。首先对PR控制器的原理进行了介绍，通过对PR控制器的改进构成了准PR控制器，重点分析了准PR控制器控制参数对系统性能的影响，从而确定系统最优时控制器的参数，并在准PR控制的基础上添加谐波补偿环，有效消除特定次数谐波。利用MATLAB/Simulink进行仿真实验，对PI控制器与准PR控制器的实验结果进行对比分析，验证了改进的准PR控制能够在逆变器并网系统中实现无静差追踪和稳态误差消除，保证了系统的动态稳定性。

Optimal control of inverters based on quasi PR control

The proportional integral (PI) controller is used to track the signals in the process of grid connected control.However, in the tracking of sinusoidal current signals, the problem of stability and system disturbance is often caused by the impact load,This paper presents an optimal control strategy for quasi proportional resonant (PR) inverters based on proportional resonant (PR) control technique.Firstly, the principle of PR controller is introduced,Through the improvement of the PR controller, the quasi PR controller is constructed,The influence of the parameters of the quasi PR controller on the system performance is analyzed, and the parameters of the controller are determined when the system is optimal,On the basis of quasi PR control, a harmonic compensation loop is added to eliminate the harmonic in a certain number of times.The simulation experiment is carried out by using MATLAB/Simulink, and the experimental results of PI controller and quasi PR controller are compared and analyzed,It is proved that the improved quasi PR control can realize zero static error tracking and steady state error elimination in the grid connected inverter system, and guarantee the dynamic stability of the system.