The Control Strategy for Railway Power Conditioner in the Reference Frame of Two-Wattmeter Method

The paper analyzes the analytical expression for active current of the electrical railway power system in the two-wattmeter method reference frame (TWMRF) to obtain the condition of unit power factor. Besides, as the main contribution of this paper, the optimal compensating strategy for railway power conditioner was proposed that suited for the random fluctuated two-phase loads to satisfy the power quality standard. The proposed control strategy differs from the based on instantaneous pq-theory one by absence of dual coordinate transformation which simplifies the construction of the control system, as well as increases its accuracy and speed. The correct functioning of the proposed strategy has been proven by the coincidence of theoretically substantiated and experimentally obtained dependencies of instantaneous active and reactive powers.