Modelling and Design of Power Flow Controller of Three-Phase Hybrid Transformer

In this article, a power flow control method of a three-phase hybrid transformer is proposed to maintain good power quality. Considering the practical impedances of the transformer, the power converter equivalent circuit of the hybrid transformer is derived, and the voltage equation, active power, and reactive power are analyzed. Based on the analysis, the power flow controller is designed in the z-domain. They are implemented in the synchronous reference frame. The AC/DC converter controls the dc-link voltage and the transmission-line reactive power flow. The DC/AC inverter regulates the input voltage of the AC/DC converter and the transmission-line active power flow. The simulation results verify the effectiveness of the proposed power flow control.