The project is located in Luquan District, Shijiazhuang City, Hebei Province. The project covers 13 district heating, 3 heat exchange stations, 3 boiler rooms, and a total of 60 sets of 60 frequency conversion speed control systems covering 0.7KW-75KW. Different power frequency control systems. As the project is related to the heating period of the people in Luquan District of Shijiazhuang City during the heating period of 2017-2018, our company optimizes the construction period while ensuring the quality of the equipment. It takes only 80 days from design to production to final batch delivery. Later power-on debugging still achieves 0 failure rate with its excellent performance, and realizes heating on schedule.