Adaptive optimization method of main steam pressure with primary frequency modulation of thermal power unit pressure control valve control mode
A technology of main steam pressure and thermal power unit, applied in the direction of adaptive control, control/regulation system, general control system, etc.
Active Publication Date: 2017-10-03
云南电力试验研究院(集团)有限公司
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[0004] At present, the research on the self-adaptive optimization of the main steam pressure of the primary frequency modulation function of thermal power units is still in its infancy. The optimization method we research is realized through field test data collection and logic construction in the main control system of thermal power units. This method does not Increase the cost of purchasing equipment, and the means of realization are simple and easy
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[0058] The main control logic block diagram of the primary frequency modulation function parameter adaptive optimization method of the thermal power unit voltage control valve control mode is shown in figure 1 , the implementation of the specific control strategy is as follows:
[0059] (1) Determine the relationship between the main steam pressure change in different pressure sections and the unit load change
[0060] According to the constant-slip-constant curve of the main steam pressure of the thermal power unit, the main steam pressure is divided into sections: the minimum main steam pressure P allowed for the normal operation of the unit after grid connection tMIN To the constant pressure P in the low load section tL As the first section, the sliding pressure part is divided into n sections equally, and the rated constant pressure P of the high load section tH To the maximum main steam pressure P allowed for normal operation of the unit tMAX As the last section; keep ...
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The self-adaptive optimization method of primary frequency modulation function parameters of thermal power unit voltage control valve control mode, the steps are: (1) Segment it according to the constant-slip-constant curve of the main steam pressure of the unit, and determine the variation of the main steam pressure of each section and the load of the unit (2) According to the relationship between the main steam pressure change and the load change in each section, calculate the primary frequency modulation of the main steam pressure in the pressure control mode; (3) When the unit is running in the boiler following mode, determine The relationship between the load variation of each pressure section and the comprehensive valve opening variation; (4) According to the relationship between the load variation of each pressure section and the comprehensive valve opening variation, determine the primary frequency modulation of the comprehensive valve opening of the valve control mode (5) Introduce the primary frequency modulation amount of the main steam pressure and the primary frequency modulation amount of the integrated valve position into the pressure control valve control to realize the adaptive control of the main steam pressure with the primary frequency modulation function. The invention can realize the self-adaptive control of the main steam pressure of the primary frequency regulation function, further improve the pass rate of the primary frequency regulation, and enhance the stability of the power grid.
Description
technical field [0001] The invention belongs to the thermal automatic control field of thermal power plants, and is a method for realizing the primary frequency modulation function of the thermal power unit pressure control mode and the main steam pressure self-adaptive control method of the thermal power unit primary frequency modulation function. Background technique [0002] The primary frequency regulation function of the thermal power generating unit is mainly realized by superimposing the primary frequency regulation amount of the comprehensive valve position opening degree on the comprehensive valve position opening instruction, and superimposing the primary frequency regulation amount of the unit load by the CCS power control mode. While the unit normally operates in the main steam pressure control mode, when the primary frequency regulation is activated, the primary frequency regulation amount superimposed by the comprehensive valve position opening command is often ...
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IPC IPC(8): G05B13/02
Inventor 李长更
Owner 云南电力试验研究院(集团)有限公司