快速开关型故障限流器在机组并网场景下的应用研究OA

When the power supply planning of the power grid is overly centralized,the addition of large-scale units and their connection will lead to a significant increase in the short-circuit current level of the existing power grid,which may approach or exceed the rated breaking capacity of circuit breakers,thereby endangering the safe and stable operation of the system.Taking the grid connection project of a newly-built large-scale unit in Bangladesh as an example,this paper proposes a technical solution based on the fast-switching fault current limiter(FCL),first elaborates in detail the parameter design principles of FCL and establishes an electromagnetic transient simulation model,then evaluates the short-circuit current suppression effect and transient recovery voltage(TRV)characteristics,and finally propose a verification principle for the transient recovery voltage rise rate(RRRV)applicable to this scenario.The research results are shown as follows:The peak current of this scheme is reduced to 8.062 kA,with the steady-state effective value reduced to 6.820 kA.While the short-circuit current is effectively controlled,the scheme can ensure the stable operation of the system,and also has significant technical feasibility and economy.Thus,the proposed solution has reference value for the short-circuit current control of similar projects at home and abroad.