摘要
逆变型新能源的内阻抗不稳定、相角受控,因此比率制动式差动保护面临巨大挑战。为解决该问题,提出了基于两侧电流幅值比的纵联保护方法,同时分析了该方法在场站T接情况下的适应性并提出了改进判据。所提方法只需传递标量信号,降低了对通信系统和同步能力的要求,且在重合于永久性故障以及场站失电情况下均能正确动作,原理简单可靠,具备工程应用价值。仿真结果表明所提方法能够正确区分区内外故障,录波数据进一步证实了该方法的有效性。
The internal impedance of inverter-interfaced renewable energy generator is unstable and its phase angle is affected by control system,so the ratio braking style differential protection faces great chal?lenges.To solve this problem,a pilot protection method based on current amplitude ratio of both sides is proposed.Meanwhile the adaptability of the proposed method in condition of teed line is analyzed and the improved criterion is put forward.The proposed method only needs to transmit the scalar signals,which re?duces the requirements on the communication system and synchronizing ability.It can correctly operate in the case of reclosing on permanent faults and power failure.In addition,its principle is simple and reliable,and it has engineering application value.The simulative results show that the proposed method can correct?ly distinguish internal and external faults and field-testing data also confirm the effectiveness of the method.
作者
贾科
杨哲
朱正轩
郑黎明
毕天姝
JIA Ke;YANG Zhe;ZHU Zhengxuan;ZHENG Liming;BI Tianshu(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2019年第12期82-88,共7页
Electric Power Automation Equipment
基金
国家重点研发计划资助项目(2016YFB0900203)
国家自然科学基金资助项目(51777071,51407067)
中央高校基本科研业务费专项资金资助项目(2016ZZD01)~~
关键词
逆变型电源
继电保护
纵联保护
幅值比
送出线路
inverter-interfaced power generator
relay protection
pilot protection
amplitude ratio
transmission line
