Voltage and Power Balance of a Three-phase Solid State Transformer using A Decoupled Control Strategy for Grid-Side Converter

The solid state transformer (SST) will permit lessening of size and weight by replacing bulky conventional transformers with the multi-stage converters which use a high-frequency transformer. A generally solid state transformer (SST) consisting three-part, the first part dc/ac type converter, the second part or middle part a dual active bridge (DAB) type dc/dc converter which is associated with the high-frequency transformer to give a controlled dc, and the third part framing the interface of a renewable energy source based dc/ac converter. In any case, because of dc-interface voltage and power unequal pressure increments on the semiconductor devices, this causes overvoltage or over current issues.This work presents voltage and power adjusts technique for a three-phase solid state transformer (SST). A decoupled grid side voltage situated control procedure for a grid side converter is proposed which permits bi-directional power flow amongst inverter and grid and is utilized to control the active power, reactive power and accomplishing a steady dc interface voltage. The reactive power and active power are controlled by the d-axis and q -axis current. Subsequently, these powers are controlled and decoupled effortlessly and autonomously. At long last, the simulation model is carried out in MATLAB/SIMULINK and every one of the outcomes has been examined quickly.