To solve forced power oscillations arising from a thermal power unit’s load fluctuation frequently, load control mechanisms and solutions were studied in combining with these actual accidents data. This paper comprehensively analyzes the load control principle and provides a basic accident handling procedure according to the unit’s actual condition. According to analysis, inspection and dynamic test results, load fluctuation causes locked-in-place jamming of servo valve. An actuator model is established to simulate the unit’s operation under different control parameters. The simulation results show that setting unreasonable control parameters intensifies load fluctuations into forced load oscillation, which is verified by dynamic testing of the unit and the effect of control optimization on operation. This analysis and the resolution of this issue are effective and accurate, providing a valuable reference in the event of a similar accident. It is determined that strict process control of overhaul and in operation can reduce the probability of load fluctuation, and control parameter optimization can avoid forced load oscillation.

中文翻译：

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汽轮发电机伺服阀卡死引起的有功功率波动机理研究

为解决火电机组负荷频繁波动引起的强迫功率振荡问题，结合实际事故数据，研究了负荷控制机制及解决方案。本文综合分析了负荷控制原理，并根据机组实际情况提供了基本的事故处理程序。根据分析、检查和动态试验结果，负载波动导致伺服阀卡死。建立执行器模型来模拟机组在不同控制参数下的运行情况。仿真结果表明，控制参数设置不合理会加剧负荷波动，形成强迫负荷振荡，通过机组动态试验和控制优化对运行的影响，验证了这一点。该问题的分析和解决是有效、准确的，为以后发生类似事故提供了宝贵的参考。确定了大修和运行的严格过程控制可以降低负荷波动的概率，控制参数优化可以避免强迫负荷振荡。