Power plant system with additional steam turbine and variable frequency auxiliary machines and control method

Abstract

The invention relates to a power plant system with an additional steam turbine and variable frequency auxiliary machines and a control method. Systems and control methods similar to the power plant system and the control method which greatly improve power generating efficiency are absent at present. The system comprises an auxiliary machine equipment cluster, and is characterized in that the system further comprises the additional steam turbine, a power generator, a transformer, an auxiliary machine busbar, a steam turbine speed adjusting device and a distributed control system (DCS); the steam turbine speed adjusting device is connected with the additional steam turbine; the transformer is connected with the auxiliary machine busbar; the auxiliary machine busbar is connected with the auxiliary machine equipment cluster. The control method includes the steps that the DCS generates a proper control instruction according to current load information of a thermal power generating unit and variable frequency voltage value required by the auxiliary machine equipment cluster; the control instruction acts on the inside of the steam turbine speed adjusting device; and 20-50HZ voltage is generated through the power generator and the transformer and directly transmitted to all auxiliary machine equipment in the auxiliary machine equipment cluster through the auxiliary machine busbar. According to the power plant system with the additional steam turbine and the variable frequency auxiliary machines and the control method, the structural design is reasonable, and power generating efficiency is greatly improved.

Description

technical field [0001] The invention relates to a power plant additional steam turbine with variable frequency auxiliary system and control method, which is mainly used in the power plant to use the auxiliary steam to generate electricity for the plant, and can generate variable frequency voltage to realize the operation of multiple frequency variable auxiliary machines. Background technique [0002] At present, the country requires thermal power generation enterprises to improve the power generation efficiency of the unit as much as possible, and at the same time meet certain requirements for energy saving and emission reduction. In particular, reducing the plant power generation rate and recycling of working fluids related to power generation units will have a very great prospect. [0003] There are also systems for energy recovery and utilization of steam turbines. For example, the Chinese patent whose publication date is January 25, 2012 and whose publication number is CN...

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Problems solved by technology

[0004] At present, there is no system and control method for additional steam turbine with variable frequency auxiliary equipment in power plants with reasonable structural design, reliable performance, energy saving and consumption reduction, and greatly improved power generation efficiency.

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