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

WANG Jiasheng; ZHAO Jie; ZHONG Jingliang; WANG Suobin; XU Zhangfu

doi:10.19666/j.rlfd.201711108

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

更新时间：2025-09-28

- Reason analysis and treatment for over-speed of load rejection test of supercritical units
- Thermal Power Generation Vol. 47, Issue 8, Pages: 115-119(2018)
- 作者机构：
  
  1. 贵州电网有限责任公司电力科学研究院
  2. 重庆大学动力工程学院
  3. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201711108
  CLC： TK267
- Published Online：02 August 2018，
  
  Published：2018
- 稿件说明：
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WANG Jiasheng, ZHAO Jie, ZHONG Jingliang, et al. Reason analysis and treatment for over-speed of load rejection test of supercritical units[J]. Thermal power generation, 2018, 47(8): 115-119.
DOI：

WANG Jiasheng, ZHAO Jie, ZHONG Jingliang, et al. Reason analysis and treatment for over-speed of load rejection test of supercritical units[J]. Thermal power generation, 2018, 47(8): 115-119. DOI： 10.19666/j.rlfd.201711108.

摘要

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。

Abstract

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.

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