A control method to improve the ace response performance of 300mw coal-fired unit

Abstract

The invention relates to a control method for improving the area control error (ACE) response performance of a 300MW coal-fired unit. According to the control method for improving the ACE response performance of the 300MW coal-fired unit, a delaying module, an or-gate module, an and-gate module, a selecting module, an inertia link module, an addition module and a function module are included; andby improving forming logic of an load instruction of the main control side of a steam turbine, the unit load can be greater than (when the load is up) or less than (when the load is down) the load target value and can be stabilized at the load target value after two seconds, and ACE assessment requirements are met.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a control method for improving the ACE response performance of a 300MW coal-fired unit. Background technique [0002] With the development of social economy and the continuous improvement of people's living standards, all walks of life have put forward higher requirements for the reliability of power supply and power quality, and the power grid has made higher requirements for power plants. ACE (Area Control Error ) assessment, the conventional control logic is difficult to meet the ACE assessment requirements, so it is necessary to improve the main control logic of the steam turbine. [0003] The invention with the application number CN201610841930.9 provides a load distribution method and device for coal-fired units. This invention enables the coal-fired units to achieve a reasonable load distribution under the rigid requirements of the power grid for load adjustment and...

AI Technical Summary

Problems solved by technology

[0002] With the development of social economy and the continuous improvement of people's living standards, all walks of life have put forward higher requirements for the reliability of power supply and power quality, and the power grid has made higher requirements for power plants. ACE (Area Control Error ) assessment, the conventional control logic is difficult to meet the ACE assessment requirements, so it is necessary to improve the main control logic of the steam turbine

[0003] The invention with the application number CN201610841930.9 provides a load distribution method and device for coal-fired units. This invention enables the coal-fired units to achieve a reasonable load distribution under the rigid requirements of the power grid for load adjustment and the constraints of the unit itself. Economical and environmentally friendly operation, improve the economic competitiveness of the whole plant power generation, but this method is difficult to meet the assessment requirements of the power plant ACE

[0004] like figure 1 The typical steam turbine main control logic flow chart is shown. The main task of the steam turbine main control system is to make the steam flow into the steam turbine meet the load requirements of the unit, control the opening of the steam turbine valve, and maintain the actual power of the unit equal to the load command; the typical main control system of the steam turbine The load command in is formed by the load target value after the rate limit, and the actual generating power of the unit follows the load command. Generally, the actual generating power of the unit will not exceed the unit load command; but in the ACE assessment, each time the load is changed, When the load instruction reaches the target value, it is required that the actual generating power of the unit is greater than (when the load is increased) or less than (when the load is decreased) the target value of the load, and the actual load is kept stable at the target value of the load within 3-5S, and the deviation is not greater than ±2MW; the typical main control strategy of the steam turbine is difficult to meet the assessment requirements of the ACE of the power plant, which affects the economic benefits

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