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针对相间功率控制器(interphase power controller,IPC)在潮流控制过程中过电压及其保护的问题,基于相间功率控制器的基本结构原理,建立了电压与元件参数之间关系的数学模型,探讨了IPC过电压出现的原因及其保护系统的组成,并以两电网带IPC 240联络线为例采用Matlab中的Simulink搭建了仿真模型,进行了各种运行状态下的过电压及其保护的仿真分析。结果表明:正常运行时调节IPC的参数超过一定的范围会引起过电压;IPC端口开路时产生的谐振过电压是各种运行状态下最严重的;由于受断路器动作的影响,单相接地短路故障引起暂态过电压是各种短路故障中最严重的。在各种运行状态的过电压保护仿真中,IPC端口并联氧化物限压器(metal oxide varistors,MOV)及IPC电容、电感元件两端并联带触发间隙和旁路开关的MOV与断路器配合均能起到有效的过电压保护作用,严重情况下MOV并联的间隙电路被触发后能保护MOV。
Aiming at the problem of over-voltage and its protection during the flow control of interphase power controller (IPC), the mathematical model of the relationship between voltage and component parameters is established based on the basic structure principle of interphase power controller. IPC overvoltage reasons and the composition of its protection system. Taking the two power grids with IPC 240 tie-line as an example, a simulation model was established by using Simulink in Matlab, and the simulation analysis of overvoltage and its protection in various operating states . The results show that adjusting the parameters of the IPC over a certain range during normal operation will cause overvoltage. The resonant overvoltage generated when the IPC port is open is the most serious under various operating conditions. Due to the action of the breaker, the single-phase to ground short Fault caused by transient over-voltage is the most serious short-circuit fault. In various operating states of overvoltage protection simulation, IPC port parallel oxide voltage limiter (metal oxide varistors, MOV) and IPC capacitors, inductors both ends of the trigger gap and bypass switch MOV and circuit breakers are matched Can play an effective over-voltage protection, in severe cases MOV parallel circuit gap is triggered to protect the MOV.