Abstract : Due to various reasons, the actual load on a heating heat exchange station often differs significantly from the design load, resulting in a "large horse pulling a small cart" phenomenon and causing substantial energy waste. To address this, the author employs a control system composed of a frequency converter and a PLC in practice. This system can adjust the speed of the circulating pump, saving energy and significantly reducing operating costs. It also features rust prevention for the circulating pump and automatic system restart after a power outage, enabling unattended operation of the machine room. Keywords : Heat exchange station; Frequency converter; Control system; Energy saving A heat exchange station is an important component of a centralized heating system. The heat exchanger exchanges heat between steam (110℃-130℃) or high-temperature hot water (above 85℃) in the heating network and the circulating water in the terminal network. The heated circulating water is then pressurized by a pipeline pump and sent to the radiators or fan coil units used by individual users. The circulating water then returns to the heat exchange station for further heat exchange, repeating the cycle continuously. When designing heat exchanger units, since the heat exchanger outputs heat within a fixed range, the selection is based on the user's maximum load. However, in actual use, due to various factors such as building planning, construction period, low occupancy rates in residential areas, and seasonal environmental changes, the actual required load varies considerably. For example, the Lijiang Water Piano residential community in Zhengzhou has 100,000 square meters of building area using centralized heating. Due to phased construction and phased occupancy, the actual load used is almost half of the design load. Statistics show that at low loads, only about 30% of the total load is used, resulting in significant energy waste and inevitably leading to a "large horse pulling a small cart" phenomenon. Therefore, how to solve this problem, both meeting the user's load requirements and achieving energy savings and reduced operating costs, requires comparing multiple solutions. The best solution is a control system composed of frequency converters and programmable controllers in the heat exchange station system. This system can meet different load requirements, save energy, and has functions such as automatic rotation of the circulating water pump and standby pump to prevent pump seizure, as well as automatic reset and restart after a power outage. [b][align=center]For details, please click: Application of Frequency Converters in Heating Systems of Heat Exchange Stations[/align][/b]