Research Of Active Arc Suppression Coil Technology

Arc-suppression coil with the function of auto-tracking and auto-compensating is mainly applied in 6KV-35KV middle-low distribution network.The inductive current supplied of arc-suppression coil can effectively compensate grounding capacitance current of the system while single-phase earth fault happens.Earth grounding current could be reduced and be crushed out.So adjusting resonance oscillation of the coil correctly has played crucial roles in ameliorating quality of network's power supply and improving reliability and safety.The paper firstly analyses the resonant grounding's principle and tuning mode of neutral grounding system,and commonly capacitance current detection methods.It indicates the problems of traditional coil and deeply researches active inverter technology and adjustable reactor theory.The text demonstrates this possibility that the theory uses in resonance system and puts forward a new kind design precept of the active arc-suppression coil.It has expounds its structure and work principle and specifically discusses the control mode of the coil and capacitance current diction method when resonance happens.Secondly It makes detailed comparison about three methods of control technology of the coil,and draws a conclusion that adopting control strategy that compared with the current triangle wave can achieve very good precisely compensation requirements.And makes the frequency constant of the power components and quickly dynamic response.Finally it has been proved that this new theory is feasible for the kind coil.It carries a comprehensive Matlab/Simulink modeling simulation about compensation scheme.It has inspected the correctness of active arc-suppression coil that can extinguish arc from the simulation results. It has overcome the shortcomings of a level tuning and realized the precise compensation to the residual current.This paper also comes up with the system design optimization scheme.It gets a further step to reduce the power switch frequency that doesn't affect compensation feature and makes an expect compensation effect.