Focus On The Dynamic Characteristics Of The Heating Pipe Network And Its Control Strategy

Because of district heating system saving energy and protecting environment, in recent years it is developed rapidly in north part of our country. But lacking of the corresponding adjustment measure and the control algorithm, the current district heating system is not able to display fully to its superiority. Therefore, district heating system network's whole energy conservation coordination control strategy and corresponding control algorithm's research and application is important.This paper first simplifies the model of the heating network, which is decomposed to the heat transfer station, the pipeline and the pipe network node. Respective mathematical model is distinguished according to the physical model. At the same time, the mathematical model of the static operating mode is set up, and then simulation model is respectively established under the corresponding MATLAB/S1MULINK simulation environment in this foundation. It applies the simulation analytic method to simulate computation of hydraulic power computation, and introduces partition linearization processing method to approach the heat exchanger's distributed parameter model which can simulate effectively the great disturbs and the entire operating mode scope. According to the physical model connection, and the corresponding hydraulic power computation model, each kind of heating network mode can be established quickly. The simple method to build test platform, brings convenience for each kind of heating network's test of dynamic characteristic, and it also provides a platform for the application of control strategy on the heating network. This paper has tested dynamic characteristics of one kind of branched heating network in many kinds of perturbation situation, and proposed one kind of whole coordination control strategy for heating network.Based on characteristic of the heating network and the heat exchanger, this paper chooses generalized predictive control algorithm based on two identifiers that directly identify controller's parameters. It has omitted to computation of the matrix inversion and the Diophantine system of equations, and thus reduced the operation process and the operation time greatly. It has introduced the predictive algorithm, and unifies with the traditional identification algorithm, to form one kind of new algorithm that is suitable in the situation of time-variable parameter. This paper first has given a minute analysis of its rationality and the superiority theoretically, finally had proven the feasibility using simulation to control the heat exchanger. It unifies two algorithms' merits, and standing the kind of accusation object based on slow time-varying parameters accusation object, the heating network or the heat exchanger, will be under a better control. One kind of auto-adapted environment algorithm for the heating network's whole optimization will be provided, and this will promote control algorithm's application.