Non-intrusive Load Monitoring Technology And Energy-saving Analysis Of Central Air-conditioning For Railway Station Buildings

In recent years,the energy consumption of public buildings in China has become higher and higher.As an important part of public buildings,energy-saving research is particularly important for railway station buildings.Monitoring the operating conditions of the equipment in the station buildings can provide data support for specific energysaving research in the future.At the same time,it can also optimize the internal power consumption of the station building to achieve energy saving.At present,most railway station buildings do not use monitoring technology,and a few use intrusive load monitoring technology,which means the equipment in the system is monitored separately.The hardware cost of this method is relatively high.When the number of loads is too large,data processing is much more difficult.Therefore,this article uses non-intrusive load monitoring technology for equipment monitoring,which means only a monitoring device is installed at the electrical energy entrance,and the total power consumption information can be collected to realize the equipment monitoring in the station.According to previous data,it can be seen that the energy consumption of central air conditioning can account for more than half of the entire station building.The water system of central air conditioning accounts for the largest proportion of energy consumption.The capacity of the cold water pump is designed according to the long-term maximum load.However,the cold water pump still uses fixed frequency operation control,which consumes huge energy,and it is of great significance to study its frequency conversion operation.This paper conducts a comprehensive study on non-intrusive load monitoring technology and energy saving of air-conditioning water system.The main results are as follows:In the research of non-intrusive load monitoring,considering the accuracy of single steady-state feature decomposition is not high and the load characteristics of the actual load in operation may change with the change of working status,this paper takes the fundamental active power of each electrical equipment and its stable working state as the research object.No optimization algorithm is used,and the current optimal matching method is applied for monitoring.Finally,simulations and experiments verify that this method can accurately obtain the active power and working status of each type of electrical equipment in the system.In the research of the central air-conditioning water system,based on the fact that the air-conditioning water system of most domestic station buildings still adopts a constant flow adjustment method,the running water pump always runs at full speed according to the set working conditions,resulting in the current situation of huge energy consumption.A variable flow modification plan is proposed for the chilled water circulation system,cooling water circulation system and cooling tower system in the central air conditioning water system.At the same time,considering that the model of the central air-conditioning water system of the station is difficult to determine,this paper proposes a method of combining fuzzy control and PID control.This method does not rely on the mathematical model of the controlled object,and at the same time it can eliminate interference.Then two control models were built through Simulink simulation,and it was verified that fuzzy PID control is better than conventional PID control.Finally,the paper introduces the software and hardware design involved in the control system in more detail.The system controller selects Siemens S7-300 PLC series products,and at the same time Step7 programming software is used to write the fuzzy control algorithm into it.Finally,a semi-physical experiment was implemented with the configuration software Win CC to verify the effectiveness of the method.