Design of a long-distance power supply terminal voltage compensation device

This article designs a power supply terminal voltage compensation device, which includes a voltage detection unit, a control unit, a compensation unit, and a bypass unit.The compensation unit includes a parallel voltage transformer, an inductor, a parallel side converter, a DC capacitor, a series side converter, and a series transformer.The parallel side converter, the DC capacitor, and the series side converter form a back-to-back voltage source type converter system, and active power can flow bidirectionally between the two converters; The controller controls the compensation unit to perform terminal voltage compensation based on the starting voltage and terminal voltage detected by the voltage detection unit.The entire power supply terminal voltage compensation device and method can effectively compensate for terminal voltage fluctuations caused by long lines and large load changes, ensuring the stability of underground power supply.