CAJ | 학술논문

大容量可控电抗器等柔性交流输电系统(FACTS)设备已应用于新疆与西北联网750 kV 第二通道输变电工程。电容电流是影响超高压长线路差动保护性能的主要因素，需计算出分布电容电流和并联电抗器电流后进行补偿。由于可控电抗器在运行中容量是变化的，根据电抗器参数间接计算电流的做法会造成过补偿或欠补偿。为此，提出将可控电抗器实测电流引入线路差动保护，以实现电容电流的精确补偿，并分析了应用中需注意的问题。最后，采用数模试验验证了理论分析的有效性。新方法提高了差动保护的灵敏性和可靠性，已在新疆与西北联网工程中获得成功应用。
대용량가공전항기등유성교류수전계통(FACTS)설비이응용우신강여서북련망750 kV 제이통도수변전공정。전용전류시영향초고압장선로차동보호성능적주요인소，수계산출분포전용전류화병련전항기전류후진행보상。유우가공전항기재운행중용량시변화적，근거전항기삼수간접계산전류적주법회조성과보상혹흠보상。위차，제출장가공전항기실측전류인입선로차동보호，이실현전용전류적정학보상，병분석료응용중수주의적문제。최후，채용수모시험험증료이론분석적유효성。신방법제고료차동보호적령민성화가고성，이재신강여서북련망공정중획득성공응용。
Large-capacity controllable shunt reactor(CSR) has been applied to the 750 kV northwest 2nd power transmission channel project.Capacitive current is the main factors affecting the performance of differential protection used for extra high voltage(EHV) long line,and distributed capacitive current and shunt reactor current should be calculated and compensated completely.As the capacity of CSR is greatly variable in operation,the practice of indirect calculation of CSR current with its parameters will result in over-compensation or under-compensation.To achieve accurate compensation results,the CSR current is directly introduced into line protection.The problems for attention in engineering application are discussed as well.Digital simulation test is performed to verify the validity of theoretical analysis.This method has improved the sensitivity and reliability of line protection and is successfully used in real projects.