Optimum control system and method for ensuring primary frequency modulation action in thermal power unit AGC mode

Abstract

The invention discloses an optimization control system and method ensuring primary frequency modulation motion under an AGC mode of a thermal power generating unit. When a frequency deviation signal [delta]f exceeds a frequency modulation dead zone prescribed by a state grid by + / -0.033Hz and the directions of AGC and the primary frequency modulation motion are different, namely [delta]f < -0.033Hz and an AGC load instruction value is in an increasing phase, or [delta]f > 0.033Hz and the AGC load instruction value is in a decreasing phase, then the set load instruction value stops increasing or decreasing, and coordinative control (CCS) keeps the current load instruction value unchanged; and under other conditions, the AGC and the primary frequency modulation works normal according to a routine control logic. According to the invention, the priority of the primary frequency modulation motion in the power grid frequency fluctuation process is effectively ensured, the amplitude of the primary frequency modulation motion is enabled to meet the requirement of power grid frequency compensation, the accuracy of the thermal power generating unit for primary frequency modulation response scheduling is improved, the motion qualified rate is improved is improved, and the frequency fluctuation of the power grid system is lowered.

Description

technical field [0001] The invention relates to the field of frequency modulation of thermal power units, in particular to an optimized control system and method for ensuring primary frequency modulation in the AGC mode of thermal power units. Background technique [0002] With the grid connection of new energy, load growth and the continuous increase of the scale of the power grid, as well as the increase in the installed capacity of the power industry in my country and the increase in the peak-to-valley load difference on the power side, in order to ensure the safe and stable operation of the power grid, all large-scale thermal power units require With the AGC function enabled, large thermal power units often operate in a wide load range, generally ranging from 50% to 100% of the rated load, and the units are required to respond quickly, accurately and stably to load changes. At the same time, primary frequency regulation requires the unit to have the ability to respond to ...

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Problems solved by technology

[0005] Since the working time of the AGC is longer than that of the primary frequency modulation, and because its action priority is lower than that of the primary frequency modulation after passing through the rate limit, in some cases in actual operation, the primary frequency modulation and the AGC action are reversed, resulting in the primary frequency modulation action range The need for frequency compensation cannot be met

In this way, on the one hand, the primary frequency regulation assessment of the power plant will not meet the standard, which will affect the actual economic benefits of the power plant;

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