水轮机及引水系统刚性水锤线性化模型改进浅论

Discussion on Improvement of Rigid Water Hammer Linear Model of Hydraulic Turbine and Diversion System

异步联网后,大型水电机组水锤效应恶化系统运行,易出现超低频振荡现象。仿真发现,现行仿真平台的水轮机-引水系统模型参数不够准确,对反调的模拟出现偏差,且在应用层面,存在定义和物理意义上的模糊。基于现有模型应用现状和TV卡结构,提出了模型改进方案,通过实测和辨识,获取了改进模型参数,在BPA平台验证了改进有效性。在大量实测的基础上,发现了模型参数随工况参数变化的规律。

After asynchronous interconnection,the water hammer effect of large hydropower units deteriorates system operation and is prone to ultra-low frequency oscillation.The simulation found that the parameters of the hydraulic turbine-diversion system model of the current simulation platform are not accurate enough,and the simulation of the counter-adjustment appears to be biased,and at the application level,there are definitions and physical ambiguities.Based on the current application status of the existing model and the TV card structure,a model improvement plan was proposed.The improved model parameters were obtained through actual measurement and identification,and the effectiveness of the improvement was verified on the BPA platform.On the basis of a large number of actual measurements,it is found that the model parameters change with the parameters of the working conditions.