带LCL滤波的并网逆变器改进PR控制策略

Improved PR Control Strategy for Grid-connected Inverter With LCL Filter

针对同步旋转d-q坐标系下的矢量控制需要复杂的坐标变换,又很难消除系统稳态误差的问题,为并网逆变器的控制提出了一种基于2相静止坐标系下带LCL滤波的改进PR控制器的新控制策略,减少了一些复杂的旋转坐标变换,简化了控制算法。该控制策略能够实现电网电流无稳态误差跟踪交流指令信号,同时实现了静止坐标系下有功无功(PQ)的解耦控制。最后经过仿真表明,采用改进PR控制器的并网逆变器具有优良的动静态控制性能,实现了电流无稳态误差跟踪,对低次谐波以及指定次谐波具有很强的抑制能力,具有重要的实用价值。

For vector control of synchronous rotating d-q coordinate system need complex coordinate transformation,and it is difficult to eliminate the system steady-state error problem,a new control strategy based on two-phase stationary coordinates with LCL filter is put forward for improved PR controller.The complex rotary coordinate transformation is reduced and the control algorithm is simplified.The no steady-state error tracking control strategy can realize the grid current instruction signal communication,achieve the static coordinate system（PQ） decoupling control.And the simulation shows that the improved grid inverter PR controller has excellent dynamic and static control performance,and realizes the current tracking without steady-state error.It has strong inhibition for low harmonics and specified harmonic,and has important practical value.