摘要
微电网内部故障时,微源中的逆变器会限制短路电流幅值的升高,故障电流较小难以检测,致使传统保护失效。为此,提出了一种基于母线上导纳量的变化为判据的微电网保护方案,该方案采用测量导纳的幅值为判据,由于它是电压、电流共同作用的结果,故障前后的测量导纳幅值变化明显,克服了传统电流保护方案的不足;同时采用测量导纳相角的变化作为辅助判据,可以有效地区分微电网的区内外故障,实现故障的检测与定位。利用PSCAD/EMTDC进行仿真,仿真结果验证了所提方案的有效性。
During internal fault in microgrid the inverter in the micro energy resource suppresses the arise of the amplitude of short-circuit current, so it is difficult to detect the fault current due to its smaller value and it leads to the failure of the traditional protection. For this reason, a microgrid protection scheme, which takes the change of the measured bus admittance as the criterion, is proposed. Because the change of the measured bus admittance is the result of joint action of voltage and current, the change of the measured admittance before and after the fault is obvious, so the defect in traditional current protection scheme is remedied; meanwhile, the change of the phase angle of the measured admittance is utilized as auxiliary criterion, the fault inside the protection zone can be effectively distinguished from the fault outside the protection, thus the detection and location of the fault can be implemented. The effectiveness of the proposed protection scheme is validated by results of PSCAD/EMTDC based simulation.
出处
《电网技术》
EI
CSCD
北大核心
2015年第6期1751-1758,共8页
Power System Technology
基金
国家自然科学基金资助项目(51407128)~~
关键词
微电网
内部故障
母线测量导纳
保护
microgrid
internal fault
measured busadmittance
protection
作者简介
姜斌（1989），男，硕士研究生，研究方向为微电网的保护与控制，E-mail：jiangbin1017@163．com
牟龙华（1963），男，教授，研究方向为电力系统继电保护、分布式发电与微电网、电能质量；
郭文明（1989），男，博士研究生，研究方向为微电网的保护与控制；
庄伟（1982），男，博士，主要研究方向为电力系统微机保护。
