Active arc suppression of a single-phase grounding fault in distribution network based on model predictive control

Abstract

In view of the existence of single-phase grounding fault arc suppression in the non-effective grounding system of distribution network, the combination of additional active compensation and arc suppression coil is often used to suppress the grounding fault arc, and the performance of active compensation system control strategy directly determines the arc suppression performance. An active arc suppression scheme based on model predictive control (MPC) is designed. Firstly, the principle of active arc suppression using injection current mode is analyzed. Then, the active arc suppression system topology of three-cascaded H-bridge multilevel inverter is adopted, and the cost function is optimized. The active arc suppression closed-loop control system based on MPC is designed. Compared with the active arc suppression closed-loop control system based on proportional integral (PI) control, the control system proposed can achieve accurate tracking of multiple harmonic currents without parameter tuning, which effectively compensates the grounding current. Simulation and experimental results show that the proposed scheme can suppress the grounding fault current more effectively and meet the requirements of reliable arc suppression in different scenarios.

Keywords

• cascaded h-bridge
• single-phase grounding fault
• arc suppression coil
• model predictive control (mpc)
• current injection
• active arc suppression