摘要
针对现有发电机失磁保护中励磁电压不易获取和动作延时较长等主要缺陷,提出了基于同步电动势Eq的发电机失磁保护加速判据。在加速判据中使用同步电动势取代传统的励磁电压,无需获取励磁侧电气量,且加速判据性能可靠,可有效区分失磁、有励磁振荡、短路故障或其他异常运行方式,从而大大提高了发电机失磁保护的速动性和选择性,解决了失磁保护长期以来不能同时满足速动性和选择性的困扰。通过PSCAD/EMTDC仿真验证了上述结论的正确性。
Traditional loss of field protection can not measure exciting voltage easily and causes long time delay,thus a new accelerated criterion based on the synchronous electromotive force Eq is proposed.It adopts synchronous electromotive force instead of traditional exciting voltage,dispenses with the excitation side electrical quantity,performs reliably and can distinguish the loss of field from the oscillation,short circuit fault and other abnormal conditions,which improves the rapidity and selectivity greatly,and solves the long term problem that loss of field protection can not meet the requirements of rapidity and selectivity at the same time.PSCAD/EMTDC simulation verifies the correctness of the above conclusion.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第20期69-73,共5页
Power System Protection and Control
基金
国家自然科学基金项目(50607005)
自然科学基金重大国际合作项目(50920105705)~~
关键词
发电机
失磁保护
加速判据
同步电动势
功角
generator
loss of field protection
accelerated criterion
synchronous electromotive force
rotor angle
