Aiming at the problem of protection failure caused by the traditional resonant grounding system of dis-tributed new energy power plants connected to the traditional resonant grounding system,a regional line selec-tion technology based on dynamic grounding method is proposed.Firstly,the influence of distributed new energy power plant access on the traditional resonant grounding system is analyzed.Secondly,in view of the defects of the resonant grounding system of the distribution network,the traditional resonant grounding system is trans-formed into a dynamic grounding system,and the sub-regional line selection method is adopted,and the zero-se-quence current differential line is used between the distributed power supply and the neutral point in the system,and the zero-sequence current amplitude comparison method is used in other areas.Finally,the method is veri-fied in MATLAB/Simulink.The results show that in the dynamic grounding mode,when a permanent ground fault occurs,whether under the condition of low resistance or high resistance,this method can effectively deter-mine the fault line or fault area,reduce the scope of power outage,and have certain engineering application value.
关键词
分布式能源/谐振接地系统/动态接地/零序电流/相位差动保护
Key words
distributed energy resources/resonant grounding system/dynamic grounding/zero-sequence current/phase differential protection
维普
万方数据