CAJ | 학술논문

距离保护的正确工作对电力系统的安全稳定运行意义重大。针对目前距离保护失效概率难以准确反映保护原理、难以计及保护之间配合关系对失效概率的影响且计算方法较为复杂等不足，首先结合阻抗继电器的动作特性，提出了基于启动截距和测量截距的距离保护失效概率计算方法。其次，通过确定保护失效的后果和风险评估指标，进一步制定了距离保护风险评估的详细流程。最后，以IEEE 3机9节点系统为例，分析了其距离保护原理性失效风险。分析结果表明，该方法能有效适应智能电网要求，可准确计算继电保护系统的失效概率和运行风险，并可发现保护系统的部分潜在风险。
거리보호적정학공작대전력계통적안전은정운행의의중대。침대목전거리보호실효개솔난이준학반영보호원리、난이계급보호지간배합관계대실효개솔적영향차계산방법교위복잡등불족，수선결합조항계전기적동작특성，제출료기우계동절거화측량절거적거리보호실효개솔계산방법。기차，통과학정보호실효적후과화풍험평고지표，진일보제정료거리보호풍험평고적상세류정。최후，이IEEE 3궤9절점계통위례，분석료기거리보호원이성실효풍험。분석결과표명，해방법능유효괄응지능전망요구，가준학계산계전보호계통적실효개솔화운행풍험，병가발현보호계통적부분잠재풍험。
Correct and reliable operation of distance protection is of great significance to both the safety and stability of the power system.In view of the fact that the calculation of current failure probability models of distance protection is usually complicated and unable to accurately reflect the protection principle and impact of protection coordination on relay failure probability,a new method of calculating the failure probability of distance protections based on start intercept and measuring intercept is proposed according to the action characteristics of impedance relays.A detailed flow of distance protection risk assessment taking the consequence of protection failure and risk indices into account is further determined.Finally,the distance protection risk assessment of an IEEE 9-bus system is given that shows the proposed method is effective in evaluating the operating risk of distance protection as well as analyzing the latent risk of the protection system. This work is supported by National Natural Science Foundation of China(No.51307059),Fundamental Research Funds for the Central Universities(No.2014MS86)and Hebei Provincial Natural Science Foundation of China(No.E2014502065).