Research On Modeling And Simulation Of High Coupled Split Reactor On Paralleled Circuit Breakers

With the increase of power grid capacity and the rapid development of power grid construction,the system capacity is increasing as well as the short circuit current level of power system,which results in the excessive of short circuit current.The paralleled circuit breakers technology based on High Coupled Split Reactor(HCSR)is one of the methods to solve the problem of breaking high current.As the key component of paralleled circuit breakers,HCSR has impact on the breaking and closing process of paralleled circuit breakers.In order to analyze the influence of HCSR on the transient process in the operation of the paralleled circuit breakers,it is necessary to establish the broadband equivalent circuit model of HCSR and analyze the concrete influence of HCSR by simulation..The establishment of HCSR model for electromagnetic transient simulation is the basis of simulation analysis.This paper analyzes the advantages and disadvantages of the existing modeling methods of windings,and uses the macro model modeling method to obtain the equivalent circuit of HCSR.In the process of establishing HCSR macro model,HCSR is regarded as a three-port network according to the characteristics of HCSR,and the winding circuit equation is obtained.Then,the three-port network equivalent circuit model of HCSR is obtained through vector matching and circuit fitting.Then the circuit synthesis results are tested for the passive and the corresponding circuit model can be set up in the simulation software,which makes it possible to analyze the influence of the HCSR on the transient process of the paralleled circuit breakers.In order to test whether the modeling method is accurate,this paper measures the admittance parameters of a 10 kV HCSR prototype.At the same time,the admittance parameters of the port characteristic equation are calculated according to the structural parameters of the 10 kV HCSR prototype.The comparison shows that they are basically the same,thus verifying the correctness of the derived HCSR port characteristic equation.Finally,the three-port equivalent circuit model of 10 kV HCSR prototype is established by using HCSR macro model modeling method.When the simulation circuit is built in PSCAD,the influence of HCSR in the process of breaking and closing of paralleled circuit breakers is obtained through simulation analysis.The simulation results show that HCSR will have an effect on the recovery voltage of the circuit breaker.When the paralleled circuit breakers are closed or the HCSR is switched from the current dividing state to the current limiting state,HCSR will lead to the overvoltage at both ends of the reactor.