带LC滤波的三相逆变器的比例谐振控制

摘要

A novel current sensorless proportional-resonant (PR) control scheme for three-phase inverter with LC output filters is presented.The proposed control scheme with use of current sensorless only requies voltage measured across capacity instead of current measured. Compared with PR controller in synchronous frame ,the proposed PR controller is implemented in stationary frame without complex reference frame transforms, it is able to adjust positive and negative sequence components of the output current simultaneously.Simulation and experimental results show that the control scheme has good dynamic and static performances, the proposed scheme can achieve zero steady-state error for sinusoidal reference command, specific harmonics can be compensated by use of the resonant characteristics of the controller, the controlled inverter can operate well in blance loads or nonlinear unbalance loads.%针对带LC输出滤波器的三相电压型逆变器,提出一种新的无电流传感器比例谐振(PR)控制策略,仅需检测输出滤波电容电压,无需检测其电流.相比于同步旋转坐标系的PR控制器,提出的PR控制器基于静止坐标系,无需进行复杂的坐标变换,减少了计算量,能对正序与负序电流进行统一调节.仿真和实验结果表明,该控制策略具有良好的动静态性能,可实现正弦交流指令的零稳态误差控制,利用其谐振控制器的特性对特定次谐波进行补偿,在逆变器带平衡负载和不平衡非线性负载时都能适用.