适用于不平衡工况的新型双序控制器

New Dual d-q Transform Controller Applied Into the Unbalanced Condition

不平衡控制对于并网逆变器在不平衡工况下的稳定运行至关重要。首先,介绍了旋转坐标系下无正、负序分离的双序控制器实现原理,并指明它与传统双d-q变换控制器的区别,该控制器可在旋转坐标系中对输出电流进行控制,无需进行正、负序分解即可直接控制输出电流的正、负序分量;然后,证明它与静止坐标系下比例谐振(PR)控制器等价;最后,通过样机实验表明所提控制算法在不平衡工况下控制性能更加优越。

Unbalanced control is critical to the stable operation of the grid-connected inverter.Firstly the principle of no positive and negative separation of dual sequence controller under the rotating coordinate system is introduced.h also indicates the difference between the traditional dual d-q transform controller.This type of controller is able to control the output current in the rotating coordinate system and control the positive and negative vector without separating the positive and negative sequences.It then demonstrates that this controller is equivalent to the proportional resonant（PR） controller under static coordinate system.Finally, the results of the prototype test prove the proposed algorithm has better performance under an unbalanced situation.