The Decoupled Control Research of UPQC

The double-loop strong coupling problem was existed in the model of some power devices under dq coordinate system. So the entirely decoupling control of UPQC is impracticability. A novel decoupling method is proposed in the paper [2], and the entirely decoupling model of UPQC is achieved. But the paper [2] is not detailed the design of control system. The UPQC can be controlled by open-loop manner and close-loop manner. Its series part can work as either controlled voltage source mode or controlled current source mode. So is the shunt part. Four detailed control strategies were proposed under two control manners and two control modes. The control results of four control strategies are simulated. It can be proved that every control strategy can realize the control goal and the comparison of them is detailed.