An online modeling method of water supply network based on arx

Abstract

The invention discloses an ARX-based online modeling method of a water supply pipe network. The invention first establishes the real-time operation data of the pipe network system, and establishes the input and output process model of the system. The real-time operation database includes the real-time input data and real-time output data of the system; the input data includes the water supply pressure of the water plant, the water supply volume of the water plant, the pressure and flow of the booster pump station in the pipeline network, and the opening degree of the controllable valve on the pipeline; the output data includes The pressure of the pressure monitoring point, the flow rate of the flow detection point, and the water level of the reservoir. Then, based on the real-time process operation data set of the water supply network, an ARX model in the form of discrete difference equations is established. Finally, the model parameters are estimated in real time. The invention can estimate model parameters online in real time, track the state changes of the water supply pipe network in real time and make predictions; the model has simple structure and strong robustness, and combines predictive control and adaptive control theory to realize real-time optimal scheduling of the water supply pipe network.

Description

technical field

[0001] The invention belongs to the technical field of automatic control, in particular to an online modeling method for a water supply pipe network based on ARX (Auto Regressive Exogenous). Background technique

[0002] The water supply pipe network system is a dynamic network system with complex structure, large scale and strong randomness of water use. Whether it can quickly and accurately simulate and predict the operation conditions of the pipe network is the key to the optimization and scheduling of the water supply pipe network. Water supply network system models can be roughly divided into two categories: microscopic models and macroscopic models. The microscopic model is a mechanism model. It needs to know the specific parameters such as the topology structure, pipe length, pipe diameter, pipe material and water consumption of the pipe network. It is generally a nonlinear system equation composed of mass balance equation and energy balance equation, ...

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