The Energy Saving Control System Design And Study On Heat Transfer Station In Shang Wan

With the acceleration of urbanization blossoming, energy control has become a hot social issue in our daily life. Meanwhile, it is an inevitable trend that central heating is a necessary infrastructure for a city. So far, there are still many factors to prevent the development of central heating, such as, the unreasonable control ways and the lower rate of using energy. Therefore, in order to finish the target of energy saving and emission reduction of the five-years Plan, the central heating need to be ran efficiently after taking some advanced control strategies and improving the rate of using energy.This thesis introduces the technological process and the traits of controlling system according to the research background of Heating Transfer Station in Shang Wan, Erdos(it is in the province of Inner Mongolia, China). The system temperature control scheme,the system pressure control scheme and a control scheme of lateral condensation pump are designed on the basis of traits of controlling system and the target of heating transfer station. In the scheme of system temperature control of this thesis, the control system of forecasting to temperature set point of secondary water supplying and backwater has been designed which were rationally divided in many time slots according to the local temperature changing of 24 hours outdoor by the way of combination between the local meteorological data and the local users habits so that the sources of heat can be used in reasonable way. Then, the setting values within each adjusting time slot will be ensureby means of the relationship between outdoor temperature and the temperature of secondary water supplying and backwater. In addition, the form of feed forward will work on the control system. In this thesis, we can get that the the energy-efficient is a purpose of controlling the system, secondary water supplying temperature is precondition of controlling the system. Thus we can put forward cascade control scheme, which is on the basis of the main controlled parameters of secondary water supplying temperature and the vice-controlled parameters of primary side pipe network traffic.For the sake of analyzing the tight coupling relationship among all the equipment,temperature and all the flow of the operation during the period of heating, we will build a dynamic mathematical mode of the heat exchanger that is based on the physical mechanism of heat exchanger through the way of analyzing the connection between the primary side pipe network traffic and secondary water supplying temperature. Moreover,we can still build the mathematical models of pipe network, heating pumps and customers. Based on these mathematical models, PID-PID cascade control, fuzzy parameters self-tuning PID-PID cascade control and DMC-PID cascade control are used to make a simulation for the heating system cascade control scheme of heating transfer station and to verify the cascade control scheme rationality and feasibility and to analysis the dynamic performance and anti-jamming ability of the algorithm.To achieve decentralized control and centralized management to the overall heat transfer station, we have set up the design-based monitoring system of Fameview configuration screen, the communication field devices and the PLC using Modbus communication protocol in order to improve the ability of anti-interference and enhance the stability of communication and realize a remote control for heat transfer station.