Energy Saving Control Optimization And Practice Of Subway BAS System

With the rapid development of China’s urban rail transit,an increasing number of cities have opened subway lines or started subway construction programs.While urban rail transit contains multiple operation sub-systems,such as tractive power supply system,ventilation and air conditioning system,light distribution and platform screen doors,etc,each system would consume great power when operating.According to analysis,we found out that in actual operations,the energy consumption of train traction system,vehicle-mounted system and ventilation and air conditioning system altogether takes up 80% of the total subway energy consumption,among which energy consumption of ventilation and air conditioning system accounts for half of that of the three systems.While ventilation and air conditioning system is controlled and monitored by subway environment and BAS,the study first designed the BAS of typical subway stations,and then analyzed ventilation and air conditioning system current situation,describe monitoring objects and control strategies.Then combined the current energy-saving situation and analyzed the current energy-saving mode.And then,the study focused on the discussion of control strategies of water system and wind system in ventilation and air conditioning system based on the energy-saving design principles and the difficulties faced in energy-saving.The study focused on the energy-saving optimization of cold sites and control of water chilling unit regarding water system,and then discussed the energy conservation technology,operation conditions,and temperature control of the major system regarding wind system.For the last part of the study,the author selected the BAS of a typical underground station as project example and combined the on-site equipment and engineers’ experience.The energy-saving method was specifically demonstrated in the project,and it shows that the energy-saving rate reached about 28%,which is of great meaning to the research of further BAS energy-saving work in subway system.