发电厂励磁系统风机电源回路优化改造与调试探讨

Discusses the Optimization Modification and Debugging of Fan Power Supply Loop in Excitation System of Power Plant

某发电厂励磁系统功率整流柜的冷却风机电源设计为双电源单母线方式供电,当交流母线发生故障时,励磁系统功率整流柜两组风机将失电无法运行。依据励磁UNITROL 5000系统的设计逻辑,冷却风机系统的失电将导致励磁可控硅整流桥运行温度过高,最终造成励磁系统跳闸,机组停运。为此,该发电厂对励磁系统功率整流柜的冷却风机电源回路进行了优化改造,采用双电源双母线方式供电,去除冗余回路,提高了励磁系统冷却风机电源供电的可靠性。

The power supply of a company’s excitation system power rectifi er cabinet cooling fan is designed to supply power with double power supply and single bus.When the ac bus fails,two groups of fans of the excitation system power rectifi er cabinet will lose power and cannot run.According to the excitation UNITROL5000 system design logic,the loss of power of the cooling fan system will lead to the high operating temperature of the excitation SCR rectifi er bridge,which will eventually cause the excitation system to trip and the unit to stop operation.For this reason,the company has optimized and reformed the power supply circuit of the cooling fan in the power rectifi er cabinet of the excitation system,and adopted the double-power and double-bus mode of power supply to remove the redundant circuit and improve the power supply reliability of the cooling fan in the excitation system.