介绍了火电厂汽包水位控制系统存在的问题及预警和诊断的重要性。提出了采用模糊专家系统方法对汽包水位运行故障进行诊断。该方法通过检测电厂实时数据库中出现的故障征兆,结合规则库中的知识,通过模糊推理机制,诊断出汽包水位在运行过程中可能发生的故障。诊断结论用故障置信度的趋势图来表示。通过诊断实例验证了该系统的实用性。 The problems existing in the steam drum water level control system and the importance of early warning and diagnosis are introduced. A fuzzy expert system is proposed to diagnose the fault of the drum water level. The method can diagnose the possible failure of the water level in the process of running through the fuzzy inference mechanism by detecting the fault symptom in the real-time database of the power plant combined with the knowledge in the rule base. The diagnosis is expressed as a trend graph of fault confidence. The practical example of the system is validated by a diagnostic example.