A Parameter Identification Method for Linear Model of Pump Turbine

Abstract

The invention discloses a method for identifying parameters of a linear model of a pump-turbine, which comprises the following steps: obtaining a power generation working condition by coupling an approximate elastic water hammer model of a water diversion system, an IEEE six-parameter model of a water pump-turbine, a system model of a generator motor, and a model of a PID governor The linear model of the speed regulation system of the pumped storage unit is constructed below, and the linear mapping model of the speed regulation system of the pumped storage unit is constructed; the upper and lower boundaries of the parameters to be identified in the speed regulation system of the pumped storage unit are determined, and the parameter identification sample data are obtained; The network method trains the parameter identification sample data, and establishes the BP neural network parameter identification model; takes the actual measurement data of the pumped storage unit speed control system as the input of the BP neural network parameter identification model, and obtains the parameter identification of the pumped storage unit speed control system result. The invention not only makes it easier to determine the parameters of the linear model and has ideal data accuracy, but also has the advantages of less difficulty in obtaining samples and better flexibility in selecting samples.

Description

A Parameter Identification Method of Linear Model of Pump Turbine technical field The invention belongs to the field of accurate modeling of pumped storage units, be specifically related to a kind of pump-turbine linear model parameter identification method. Background technique The pump turbine is the core equipment of the pumped storage unit, and is the control object in the unit speed regulation system. The basis of the related researches on the dynamic response mechanism, control optimization and fault diagnosis of the speed control system of the water storage unit is the system model. precise description of the type. Model parameter identification is an effective way to solve the accurate expression of the unit speed control system model, and it is also a related field. Research hotspots in the field, and method research is gradually becoming mature. Domestic and foreign academic and engineering circles on the control system of pumped storage units Parameter...

AI Technical Summary

Problems solved by technology

The determination of the parameters of the linear model has always been a difficult problem in the engineering field. The traditional method is to calculate the six coefficients of the linear model based on the comprehensive characteristic curve of the water turbine or the full characteristic curve of the pump turbine at a certain stable point. Linear model parameters are difficult to determine

However, with the long-term operation of the unit or after a major overhaul, the operating boundary of its working conditions will migrate, and the linear model parameters calculated based on the characteristic curve have certain limitations on the accurate description of the real-time operating state of the unit, and the accuracy of the data is not high. ideal

Therefore, in the existing identification methods for the control system parameters of pumped storage units, there are problems that the parameters of the linear model are difficult to determine and the accuracy of the data is not ideal.

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