发电厂高压启动系统互备的研究与应用

Application Research on Mutual Backup Power Supply of High Voltage Start-up System in Power Plant

结合江苏某350MW发电厂实际情况,采取充分利用高厂变的设计冗余容量,通过分析计算,对单元制机组启动备用电源进行改造,实现相邻机组互备供电,并对改造后高厂变的容量冗余及母线电压稳定性进行了校验,提出了改造后厂用电系统继电保护配置和各电源之间快速切换方案,为同类型发电厂用电系统改造提供借鉴。

Based on the actual situation of a 350 MW power plant in Jiangsu Province, this paper took full advantage of the design redundancy capacity of high power transformer, through analysis and calculation, it put forward that the unit unit start-up standby power supply should be reformed to realize the mutual standby power supply of adjacent units, the capacity redundancy and bus voltage stability of high power transformer was verified after transformation, the relay protection of the transformed auxiliary power system was also put forward. Configuration scheme and fast switching scheme between power sources can provide reference for the transformation of auxiliary power supply in power plants with main connection mode and line-to-group connection mode.