基于动态滑模控制的并网逆变器控制策略

为了使三相LCL并网逆变器输出较理想的电压、电流,提高逆变器的运行性能,根据逆变器在d/q两相同步旋转坐标系中的数学模型,提出了电流内环的动态滑模控制策略。直接功率外环为电流内环提供参考电流。为消弱抖振问题,电流内环采用动态滑模控制。最后经PSCAD软件仿真验证了该控制策略的正确性和可行性,并且该方法能保证三相LCL并网逆变器在单位功率因数运行,具有应用参考价值。

Sliding Mode control of Grid inverter with LCL Filter

In order to obtain ideal output voltage and output current of the LCL three-phase grid inverter, and enhance the operation performance of the inverter, the paper proposed a dynamic sliding mode control strategy in current inner ring, based on the two-phase synchronous rotating d/q coordinate system mathematical model. The reference current for the current inner loop is provided by direct power control loop. In order to weaken the chattering phenomenon, the current inner use dynamic sliding mode control method. Finally the proposed control strategy is verified correct and reasonable with PSCAD software. The method guarantees the three-phase LCL grid inverter run in power factor, and has the reference value for application.