特高压混合无功补偿对单相接地故障开断特性的影响研究

The Influence of UHV Hybrid Reactive Power Compensation on Interrupting Characteristics in the Single Phase-ground Fault

针对配备有混合无功补偿的特高压输电线路发生单相接地故障情况,分析了特高压混合无功补偿对单相接地故障开断特性的影响。参考晋东南-南阳-荆门特高压交流试验示范工程的参数,简化了特高压输电线路单相接地故障的等效模型。采用等值集中参数电路的方法,推导出影响单相接地故障开断特性的计算公式,从而给出描述开断特性相关参数与混合无功补偿之间严格的数学表达式。基于这些理论公式,并与有关的仿真结果进行比较,得到混合无功补偿对发生单相接地故障线路的开断特性的影响,验证了分析方法的有效性。研究结果可为混合无功补偿在特高压输电工程中的应用提供分析和理论依据。

In the single phase-ground fault of Ultra high voltage(UHV)transmission lines with hybrid reactive power compensation(HRPC),the factors affecting the interrupting characteristics of the circuit breaker were studied through theoretical analysis and derivation.This article referred to the parameters of the Jindongnan-Nanyang-Jingmen UHV AC pilot demonstration project and established a simplified model single-phase ground fault distribution parameters for UHV transmission lines,and adopt the method of equal-valued centralized parameter circuits.The strict mathematical expressions which describe the relationship between the related interrupting characteristics parameters of the circuit breakers and HRPC degree were given in this paper.Based on these theoretical formulas,and comparing it with the relevant simulation results,the influence of HRPC on the circuit breaker interrupting characteristics and related parameters of the single phase-ground fault circuit was obtained,and the validity of the analytical method was verified.The research result provides the analysis and theoretical basis for the application of UHV transmission.