Simulation and Analysis of Two-Core Asymmetric Phase Shifting Transformer Combined Loop Power Supply Control Based on Voltage Four-Quadrant Analysis

By adjusting the voltage on one side of the loop closing point to the maximum extent close to the voltage on the other side, the phase-shifting transformer can achieve close loop closing with the same source, reduce the loop closing current and cross the power flow, providing an economic and effective technical scheme for the loop closing to power supply. The polarity of the voltage regulating winding and phase regulating winding and the gear selection of the on load tap changer are the key to the accurate voltage regulation of the phase-shifting transformer, and are the decisive factors to realize the closing loop to power supply. In order to overcome the disadvantage of the poor adaptability of the table lookup method to determine the gear and polarity of the phase shifting transformer, this paper proposes a control method for the gear and polarity of the dual core asymmetric phase shifting transformer based on the voltage vector four quadrant analysis method. Firstly, the model and regulation principle of dual core asymmetrical phase shifting transformer are introduced; Then, a new scheme of power supply based on phase-shifting transformer is proposed; Then, a dual core asymmetrical phase-shifting transformer based on voltage vector four quadrant analysis method is proposed; Finally, the proposed control method is simulated and analyzed in PSCAD simulation software, which verifies the effectiveness of the method and the feasibility of applying it to the closed loop power supply control.