Transient Current Limit Control to Transformer Short Circuit based on Harmonics Voltage Injection Method

Abstract

In the process of transformer operation, the main reason of transformer damage caused by the peak transient impulse current when the bus side is short circuited is that limiting the transient current component when the transformer is short circuited is of great significance to protect the safe operation of the transformer. Based on the series compensation circuit, this paper analyzes the mechanism of transformer short-circuit transient current component limitation, proposes a high-order harmonic injection control strategy and algorithm, and verifies the correctness of the control strategy and algorithm through calculation and simulation.