Abstract : This paper introduces the feasibility and control strategy analysis of using one frequency converter to control the speed regulation of two condensate pumps (one in operation and one on standby) for hot well water level control. It compares the advantages and disadvantages of various schemes, and discusses the energy-saving effect and application efficiency of frequency conversion speed regulation. Keywords : Frequency conversion speed regulation; Condensate pump; Hot well water level; Control strategy analysis; Interlocking standby; Energy-saving effect 1 Introduction With the rapid development of AC frequency conversion speed regulation technology, frequency converters, with their wide versatility, high reliability, and flexible control, have been widely used in various fields, achieving good results in energy saving, cost reduction, and efficiency improvement. In recent years, our company has successfully applied 18 low-voltage frequency converters to equipment such as boiler return fans, induced draft fans, secondary air fans, and coal feeders. However, these all involve one frequency converter controlling one fan. There is still potential for energy saving by applying frequency conversion regulation to two pumps (one in operation and one on standby) under normal conditions. The question is whether using one frequency converter to control the speed regulation of these two pumps can achieve both energy saving and reduced investment. This paper analyzes the control strategy of using one frequency converter to control the water level of two condensate pumps (one in operation and one on standby) in a hot well, comparing the advantages and disadvantages of various schemes, and introducing the energy-saving effect and application status of the project. 2. Equipment Introduction and Problems Before Retrofitting Our company has two C6-35/8 type adjustable extraction condensing steam turbines, each equipped with two 100NB60 type condensate pumps. The pump has a rated flow rate of 36 liters/h and a rated head of 65 m; it is equipped with a Y160-2 type 15 kW motor with a rated voltage of 380 V and a rated current of 29.4 A. During normal turbine operation, one condensate pump (the other is interlocked for hot standby) extracts condensate from the condenser hot well, heats it through a two-stage ejector and a low-pressure heater, and then sends it to the deaerator. The condensate system is shown in Figure 1. [b][align=center]For details, please click: Strategy Analysis and Application of Single-Voltage Variable-Voltage Control for One Operating and One Standby Water Pump[/align][/b]