Primary frequency modulation index estimation method for thermal power generating unit based on static characteristics

Abstract

The invention provides a primary frequency modulation index estimation method for a thermal power generating unit based on static characteristics, and the method comprises the steps: segmenting a timesequence of the rotating speed and actual power of a steam turbine into short data segments, and finding out an effective primary frequency modulation data segment; converting the turbine rotating speed and the actual power on each data segment time domain into a related variable turbine rotating speed difference and an actual power difference; reordering the turbine speed difference and the actual power difference according to the primary frequency modulation static characteristics, and combining the relation matrixes of each group to obtain a correlation domain; constructing a correlation domain of the correlation variable into a scatter domain, performing linear fitting on the scatter domain, and obtaining an actual frequency modulation dead zone and a rotating speed unequal rate of the unit from a regression curve. According to the method, the effective primary frequency modulation data segment can be found in the historical data sample in an automatic mode, the actual frequency modulation dead zone and the rotating speed unequal rate of the unit can be accurately and effectively estimated, and the problems that the influence of dynamic factors on the data sample and the deviation between the primary frequency modulation index of the unit and the set value cannot be judged are solved.

Description

technical field [0001] The invention relates to the field of generating set control, and more specifically, relates to a method for estimating primary frequency regulation indexes of thermal power generating sets based on static characteristics. Background technique [0002] Frequency modulation dead zone and speed differential are two important performance indicators in primary frequency regulation of generator sets. Coal quality, operation mode, non-linearity of regulating valves and other reasons will cause differences between primary frequency regulation indicators and set values. Therefore, the dead zone of frequency modulation and the speed droop obtained in the stage of designing the generating set usually have deviations in the stage of real-time operation and must be updated. [0003] At present, the methods of reading diagrams or modeling are usually used to estimate the primary frequency modulation of thermal power units. Existing methods suffer from two limitati...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a primary frequency modulation index estimation method based on static characteristics. The present invention does not need to manually perform or introduce some special tests, and directly finds the primary frequency modulation response segment in an automatic manner from historical data samples. , to overcome the influence of dynamic factors on data samples, and the problem that the dead zone of unit frequency regulation and the speed difference rate cannot be estimated in the daily operation state

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