Analysis and design of flexible arc suppression device based on proportional series lagging control.

• The distribution network with ineffective neutral grounding can't realize the complete extinction of grounding fault arc. A new voltage arc suppression method based on active inverter is proposed. • An active arc suppression method based on proportional delay control can effectively suppress the grounding arc. • Compared with PI control cannot achieve zero steady-state error, the arc suppression control method proposed in this paper has high control accuracy and fast response. • The test results show that the corresponding device can quickly extinguish the grounding arc. Flexible arc suppression technology can control zero-sequence voltage flexibly and realize arc suppression completely by injecting current to the neutral point of distribution network. However, in the existing control method, PI control cannot achieve zero steady-state error, and injecting current control needs to accurately measure the phase-to-ground parameters, so it is difficult to apply it in practice. For improvement, a new control method of the flexible arc suppression device is developed by using proportional controller and lagging network controller in this paper. The double closed-loop control method and the parameters of the controller are designed to improve the injecting current control performance. The zero-sequence voltage is set as the control target of the control system to realize arc suppression completely without measuring the phase-to-ground parameters. The effectiveness of the proposed control technology is verified by PSIM simulation and practical experiments. The simulation and experimental results show that the proportional series lagging control has better response speed and stability than the existing control method. [ABSTRACT FROM AUTHOR]