A Calculation Method of Main Steam Pressure Adaptive Compensation Primary Frequency Modulation Control Accuracy

Abstract

The invention discloses a calculation method of primary frequency modulation control accuracy for self-adaptive compensation of main steam pressure, which belongs to the technical field of thermal power generating unit frequency modulation. The calculation method is characterized by comprisesing the following steps: when in primary frequency modulation action, recording a current value of the mainsteam pressure at the moment, and solving a difference between the current value of the main steam pressure and an actual value of the main steam pressure in the primary frequency modulation action process; when the main steam pressure difference is homonymous with the primary frequency modulation action, increasing a correction coefficient to prevent the excessively small frequency modulation force; and when the main steam pressure difference is opposite to the primary frequency modulation action, reducing the correction coefficient to prevent the excessively large frequency modulation force. By adopting the calculation method, the reverse modulation and non-modulation times of the primary frequency modulation power caused by the excessively high or excessively low main steam pressure inthe primary frequency modulation action process can be reduced, the primary frequency modulation adjusting accuracy can be improved, and the correct action rate of the primary frequency modulation power can be improved.

Description

technical field [0001] The invention relates to the field of primary frequency regulation of thermal power units, in particular to a calculation method for adaptively compensating primary frequency regulation control accuracy of main steam pressure. Background technique [0002] As one of the important indicators of power quality, grid frequency reflects the balance between active power and load, and is an important control parameter for power system operation. The long-term cumulative effect of frequency deviation will affect the normal operation of electrical equipment, so ensuring the stability of the grid frequency is the basis for the stable operation of the power system. [0003] The primary frequency regulation of the thermal power unit takes the speed or frequency as the control amount, and the target output of the primary frequency regulation is converted from a fixed speed unequal rate. When there is a corresponding deviation in the grid frequency, the steam turbi...

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Problems solved by technology

[0004] Thermal power generation units, especially coal-fired power generation units, due to the influence of internal disturbances such as equipment operation status and frequent changes in fuel calorific value, make the main steam pressure of the boiler time-varying, especially when the main steam pressure changes greatly, it will affect the primary The adjustment accuracy of frequency modulation may even cause the phenomenon of no action or reverse adjustment of frequency modulation once.

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