Hysteresis Current Control-based Boost Rectifier Analysis for Single Phase Solid State Transformer

Abstract

Conventional transformer used in power grid occupies large space and it has a complex electromagnetic characteristic. Due to advancements in electronics and digital technology, it is possible to develop a solid-state transformer (SST). The issues like nonlinear characteristics, oil leakage, and large size with conventional transformers can certainly be eliminated by SST. It can be easily controllable and is also able to transfer power smoothly. SST compose of three main parts; converts to generate high-frequency supply, isolating transformer, and again converter to produce low-frequency supply. The boost rectifier used in STT is elaborated on in this article. Here, a power electronic transformer operating at high frequency is proposed for the integration of distributed resources in place of an electromagnetic transformer. MATLAB software is used for modeling of one-phase rectifier with the Hysteresis Current Control (HCC) technique to boost the voltage. An effective control strategy is designed with a PI controller and HCC to attain a unity power factor and reduces the total harmonic distortion (THD). It is to be noted that the outcome of hysteresis current control in terms of THD is better than fixed frequency-based current control.