Small turbine control system and method based on asynchronous motor full power converter speed regulation

Abstract

The invention relates to a small turbine control system based on asynchronous motor full power converter speed regulation and a control method of the small turbine control system. The small turbine control system comprises a full power converter, an asynchronous generator, a small turbine and a controller. The asynchronous generator and the small turbine are connected so as to match rotation speedparameters; the asynchronous generator and the full power converter are connected to conduct voltage and current level matching; and the full power converter and a power grid are connected to conductvoltage level matching, the asynchronous generator conducts rotation speed control through the full power converter and generates power on a grid through the surplus small turbine power, and the controller controls rotation speed control of the asynchronous generator through control over the full power converter. The small turbine control system based on asynchronous motor full power converter speed regulation and the control method of the small turbine control system have the beneficial effects that according to the technical scheme that the heat regeneration small turbine is provided with the generator, the heat efficiency of a heat regeneration system can be greatly improved, and unit losses are reduced. The electric quantity generated by the generator can be used for reducing the auxiliary power ratio, and the electricity selling incomings are increased.

Description

technical field [0001] The invention relates to a control method and a control system of a steam turbine in thermal power generation, in particular to a control system and method of a small regenerative steam turbine based on the speed regulation of a full-power converter of an asynchronous motor. Background technique [0002] Thermal power generation plays a dominant role in my country's power generation pattern. Reducing coal consumption for power generation can save limited coal resources and reduce pollution to the atmosphere. The large capacity and high parameters of the unit can improve the thermal cycle efficiency and meet the economic requirements of the unit. With the successful development of the latest high-temperature-resistant materials at home and abroad, China Shenhua Energy Co., Ltd., China Energy Construction Group Co., Ltd. (its subsidiary East China Electric Power Design Institute Co., Ltd. is responsible for the specific business) and Shanghai Electric Gr...

AI Technical Summary

Problems solved by technology

In order to meet the long-term full power of the unit in summer, the rated output of the small steam turbine is usually larger than the rated output of the feed water pump, and the rated output of the feed water pump is larger than the output required by the rated load of the unit, so the rated output of the small steam turbine has a large margin. The inlet valve of a small steam turbine has a relatively small opening most of the operating time, resulting in a large throttling loss

[0010] The electric fan has the same power consumption problem as the electric feedwater pump, and the steam-driven fan and the steam-driven feedwater pump also have the same efficiency problem, and the method of adjusting the air volume by adjusting the fan blades also has throttling loss

These applications reduce the power generation efficiency of the power plant

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