基于特性曲线的电站热力系统故障诊断方法

Malfunction diagnosis method for thermal system of power plant based on characteristic curve

提出了基于热力参数-性能指标特性曲线的诊断模型.首先过滤定功率情况下电站汽机阀门开度变化对性能指标的影响,定性分析部件发生故障时性能指标相比于参考工况的实际变化量,以消除部件之间的相互影响.然后确定了热力参数的选取原则,引入热经济学结构理论中的不可逆损失作为性能指标,利用所建模型定量计算故障工况下各部件的性能指标变化量,用以诊断发生故障的部件.最后运用APROS仿真软件模拟某电厂330 MW机组的多种故障工况,将提出的方法应用于故障诊断,初步证明了模型的可行性.

The diagnosis model based on the thermodynamic parameter-performance curve is pro-posed.First, the effect of a valve on performance indicator is filtered under constant power condition in a power plant, and the change of performance indicator compared to reference condition in mal-function component is qualitatively analyzed, which can eliminate the interaction between the com-ponents.Then the principle of selecting thermal parameters is determined.The irreversibility in the thermoeconomic structural theory is selected as a performance indicator, and the change of the indi-cator quantitatively calculated using the model.APROS （ advanced process simulator ） simulation software is applied to simulate a variety of fault conditions for a 330 MW unit, and the proposed model is used for malfunction diagnosis to prove its feasibility.