Parameter-varying load optimization control method of thermal power generating unit

Abstract

The invention discloses a parameter-varying load optimization control method of a thermal power generating unit. The method comprises the following specific steps: step 1, generating a judging numerical value through a differentiation element according to a change of a load instruction value; step 2, generating judging conditions of a parameter varying changing-over logic by a high-low amplitude judging module according to the judging numerical value generated by the differentiation element; and step 3, switching a switcher by using a steam engine main controller according to an output command of the high-low amplitude judging module. According to method provided by the invention, a logical structure of the steam engine main controller is optimized and a parameter varying control measure is adopted according to the change condition of load, thereby effectively eliminating the dead zone and inertance of a turbine door regulating executing mechanism, improving the control accuracy and dynamic quality of a system, ensuring a regulating speed, a regulating accuracy and a responsive time of a thermal power generating unit load, and improving the control quality and assessment index of a AGG (automatic gain control) of the thermal power generating unit.

Description

technical field [0001] The invention relates to an optimization control method, in particular to a thermal power unit variable parameter load optimization control method. Background technique [0002] With the increasing capacity of the power grid, the quality of electric energy is also required to be higher and higher. For the safe and stable operation of the power grid, all large-scale thermal power units are required to use the AGC function, and the load range of the AGC control unit is required to be large (generally 50% --100% rated load), and requires the unit to have a fast, accurate and stable response to load changes. [0003] 1. AGC assessment standards and conventional control schemes for power grid dispatching [0004] (1) AGC assessment standards [0005] The assessment of AGC is mainly carried out in three aspects: adjustment speed, adjustment accuracy and response time. Such as figure 1 As shown in the typical AGC unit set point control process, this is a ...

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Problems solved by technology

[0012] This control scheme works well when the operating condition of the unit is stable and the rate of load change is slow and stable. However, when the load changes frequently, especially when the change is large, the main parameters such as pressure fluctuate greatly. The response speed is relatively slow, and the control accuracy of the load becomes poor, which leads to the substandard quality in the dispatched AGC assessment and evaluation

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