燃气机组 FCB 逻辑与机组继电保护的配合原则分析

Analysis of the Principle of the Coordination between FCB Logic and Unit Relay Protection in Gas Turbine Unit

摘要

FCB是黑启动实现的方式之一，具有快速甩负荷 (Fast Cut Back, FCB)能力的机组可以作为系统非常规黑启动电源，有助于电网在尽可能短的时间内恢复正常，具有巨大的社会和经济效益，近年来得到了广泛的研究和应用。采用发电机出口断路器并网的燃气发电机组在策划FCB逻辑时遵循的原则是在汽机锅炉停运的同时不联跳燃机，同时要确保燃机转换为houseload模式，优先断开主变侧断路器，发电机出口断路器不能分断。因此需要探讨在电网全部或局部失电实际运行时的发电机组继电保护动作过程与FCB逻辑的配合，从而保证机组顺利实现自带厂用电的FCB运行方式。

Abstract

FCB (Fast Cut Back) is a method for black start. Units with FCB capability can serve as unconventional black start power sources for the grid, helping restore normal operation in the shortest possible time, which yields significant social and economic benefits. In recent years, this technology has been extensively researched and applied. For gas-fired generating units connected to the grid via generator outlet circuit breakers, the FCB logic design follows these principles: the turbine and boiler must remain offline during shutdown, the gas turbine must switch to household load mode, the main transformer-side circuit breaker should be disconnected first, and the generator outlet circuit breaker must not be tripped. Therefore, it is essential to investigate how the relay protection actions of generating units coordinate with FCB logic during actual operation under full or partial grid outages, ensuring the units can smoothly achieve FCB operation with their own plant power supply.

关键词

黑启动 / FCB逻辑 / 频率保护 / 发电机组保护 / 厂用电切换

Key words

black start / FCB logic / frequency protection / generator set protection / plant power switching

参考文献

[1] 《中国南方电网大型发电机变压器继电保护整定计算规程/CSG1204025-2017》南方电网企业标准,2017年5月发布.

[2] 三菱燃机用户手册

[3] 《南方区域电力并网运行管理实施细则》

[4] 《南方区域电力辅助服务管理细则》

[5] 南瑞继保《PCS-9655快速切换装置说明书》