Research On Ground Compensation Device Based On Double Loop Control

The operating environment of the power grid terminal is complex and changeable,and prone to random faults.The main fault types are concentrated on single-phase ground faults.Single-phase ground faults easily lead to two-phase or multi-phase shortcircuit faults,so they should be found and eliminated as soon as possible.At the same time,as the harmonic component continues to increase,the ability of the instantaneous ground fault to extinguish arcs becomes worse.It is difficult for the arc at the fault point to extinguish by itself,and it is easy to produce fault overvoltages,causing multiple accidents,endangering grid safety and affecting social stability.Therefore,this article studies the ground fault compensation device,which mainly solves the problem of single phase to ground fault,and also adds functions such as reactive power compensation and harmonic suppression.The research results mainly solve the resonance problem of the device.First of all,based on the idea of a three-phase three-bridge active filter,the main topology design of the ground fault system is adopted by using a three-phase fourbridge topology.Transformer and versatile.Secondly,the RT-LAB real-time simulation system is used to verify the principle and topology simulation,which proves the correctness of the design idea of this paper.In order to solve the resonance problem,this paper designs the topology and control algorithm of the LCL filter.At the same time,in order to verify the optimized algorithm,the optimized algorithm was tested on the experimental prototype of the internship company.Finally,the prototype of the ground fault compensation prototype is designed in the laboratory..