超临界机组甩负荷试验超速原因分析及处理

Reason analysis and treatment for over-speed of load rejection test of supercritical units

某超临界机组甩50%额定负荷试验转速飞升超过标准要求,严重影响机组安全运行。从试验机理分析入手,结合控制设计逻辑与动静态试验数据,得出信号传送的滞后为转速飞升超标的主要原因。对此,提出增加硬接线回路连接发电机出口开关和超速电磁阀、缩短模块的扫描周期等措施,最终机组顺利通过甩负荷试验。本文的结论对同类型机组的控制逻辑设计及运行调试有一定参考价值。

For the 50% load rejection test of a supercritical unit, the rotating speed exceeds the standard requirement, which seriously affects the safety operation of the unit. Based on the analysis of the experimental mechanism, combining with the control design logic and dynamic and static test data, it is concluded that the lag of signal transmission is the main reason for the over-speed. This study proposes some measures such as increasing the hard wiring loop logic between the switch and over-speed solenoid valve and shortening the scanning cycle of the module. Finally, the unit passes the rejection test successfully. The conclusion of this study has some reference value for the control logic design and operation commissioning of the same type set.