火电厂负荷供电故障机理分析与解决策略

摘要

火电厂关键负荷控制电源稳定性与机组安全运行密切相关。围绕故障案例实际，模拟得到了故障期间母线各相电压值，与实际值相吻合。基于此，分析提出了一种结合控制电源直流改造和变频器低电压穿越的解决策略，将能够有效避免厂内低电压事故引起的控制电源失电，保证机组安全运行。%The stability of control power supply for essential load in thermal power plant is closely related to the safe operation of the unit. In accordance with a case of fault, the voltage value of each phase is simulated and proved consistent with the actual value, and based on which, a resolution strategy is carried out through combination of reformation on DC control power supply and cut across on low voltage of converter, aiming to effectively avoid the control power loss caused by the low voltage, which will further guarantee the normal operation of the unit.