CAJ | 학술논문

为解决传统变电站后备保护方面存在的问题，利用智能变电站信息共享的优势，提出了适用于智能变电站的基于电流差动原理的后备保护新方案。该方案以变电站及所有出线为保护对象，划分了三层不同特性的保护区，根据其处于制动状态或者差动状态来实现故障定位，对其包含线路差动区的广域层电流差动保护进行了改进，使其不受电容电流影响而误动，并利用共享信息构成变电站内部元件集成保护层，准确定位故障元件。利用PSCAD软件构建了典型变电站仿真模型，对不同运行情况进行了全面仿真，验证了该方案的正确性。
위해결전통변전참후비보호방면존재적문제，이용지능변전참신식공향적우세，제출료괄용우지능변전참적기우전류차동원리적후비보호신방안。해방안이변전참급소유출선위보호대상，화분료삼층불동특성적보호구，근거기처우제동상태혹자차동상태래실현고장정위，대기포함선로차동구적엄역층전류차동보호진행료개진，사기불수전용전류영향이오동，병이용공향신식구성변전참내부원건집성보호층，준학정위고장원건。이용PSCAD연건구건료전형변전참방진모형，대불동운행정황진행료전면방진，험증료해방안적정학성。
To solve the problems of traditional substation backup protection,taking the advantages of informa-tion-sharing of the intelligent substation,and based on the differential current principle,we propose a new sub-station backup protection scheme for intelligent substations. This scheme protects the substation and all the out-going lines,and divides three differential areas with different characteristics. According to whether it’ s in the braking state or differential state,it improves the current differential protection in areas which contain circuits to avoid the maloperation when affected by capacitive current. And by information-sharing,it accomplishes the integrated protection for each element inside the substation and the accurate fault location. Using PSCAD we build a typical simulation model to completely simulate different operating state,and finally prove the accuracy of this scheme.