One-drive-two control implementing method of high voltage inverter of condensed water pumps of steam turbine unit

Abstract

The invention relates to a one-drive-two control implementing method of a high voltage inverter of condensed water pumps of a steam turbine unit. The method comprises the steps that: two condensed water pumps share one high voltage inverter, condensed water pumps No.1 and No.2 are respectively driven to carry out variable frequency operation to realize a one-drive-two control way of a frequency converter; through minimum disposable equipment investment, an energy-saving effect of the frequency converter can be developed to the greatest extent, and working frequency and variable frequency bypass switching locking protection of the condensed water pumps and working frequency interlocking start logical function of a standby pump are realized, and stable adjustment on the condensed water pumps of 600-1500rpm still can be realized by the condensed water pumps and the condensed water system under a failure condition of the high voltage inverter. According to the method, the disposable equipment investment is low; if the equivalent operation time of the unit is 4,000 hours every year, and the electricity quantity every one kilowatt is calculated based on 0.3 Yuan, so that about 700,000 Yuan can be saved in one year, and the equipment input cost can be recycled in two years; therefore, the economical benefit and the social benefit are both obvious.

Description

technical field [0001] The invention belongs to the technical field of automatic power generation control, in particular to a one-to-two control implementation method for a high-voltage frequency converter of a condensate pump of a steam turbine unit. Background technique [0002] Energy saving and consumption reduction is an important task in the production management of power plants in my country. How to reduce the power consumption of condensing steam turbine generator sets and improve the cycle efficiency of generator sets is crucial to reducing production costs, improving economic benefits, and enhancing the viability of enterprises. is of great significance. With the continuous deepening of the power marketization process, the peak-to-valley difference between the power supply and demand loads of the power system is increasing day by day, and the generator sets need to operate with deep variable load and peak regulation every day. run. Conventional generator sets are ...

AI Technical Summary

Problems solved by technology

Conventional generator sets are generally equipped with two condensate pumps with 100% capacity, one is working and the other is standby. The motor of the condensate pump operates in power frequency mode. The generator set needs to adjust the flow rate by adjusting the opening of the outlet valve of the condensate pump during the load change process. , the throttling loss is very large, not only poor control accuracy, but also uneconomical

The high-voltage frequency converter control device can keep the condensate pump in the best operating state at any time, greatly improve the operating efficiency of the motor, and reduce the production cost of the power plant. However, the one-time investment of high-voltage frequency converter is relatively large, and the recovery period of equipment investment is long.

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