Thermal power unit load changing rate correcting method based on boiler pressure response characteristic

Abstract

The invention discloses a thermal power unit load changing rate correcting method based on a boiler pressure response characteristic and belongs to the technical field of thermal power generation. Themethod is characterized by comprising the steps that firstly, a pressure deviation judgement constant value and a benchmark load changing rate are set; secondly, a pressure deviation value is obtained after a main steam pressure practical value is subtracted from a main steam pressure set value; thirdly, the pressure deviation value is compared with the pressure deviation judgement constant value, and a load changing control instruction is output; and fourthly, the benchmark load changing rate is subjected to load changing rate correction through a pressure deviation function according to thepressure deviation value, and a final load changing rate is output. When a unit changes a load, the unit load changing rate is automatically corrected according to the real-time changing situation ofthe deviation between the main steam pressure set value and the main steam pressure practical value of the unit, the unit and a boiler are controlled in a coordinated mode truly, and therefore, the operating stability of the unit is improved; and the load changing control instruction is output through the deviation between the main steam pressure set value and the main steam pressure practical value, the load changing rate of the unit is locked, and boiler combustion deterioration under special working conditions is prevented.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a method for varying the load rate of a thermal power unit based on the boiler pressure response characteristics. Background technique [0002] In recent years, with the increase in the proportion of new energy power supply such as wind power and photovoltaic power generation in the power grid, and the stricter assessment of the two detailed rules of the "Power Plant Grid Connection Management Rules" and "Auxiliary Service Compensation" issued by the power grid, the automatic power generation control AGC ( Automatic Generation Control) The load command changes frequently and quickly, the boiler thermal load change characteristics are large inertia, and the large delay lags behind the unit load change, and the unit load change rate is set to a fixed value. The variable load rate of the original unit was not automatically corrected in combination with t...

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Problems solved by technology

The variable load rate of the original unit was not automatically corrected in combination with the characteristics of the boiler, resulting in large fluctuations in the main steam pressure of the unit, serious assessment of the two detailed rules, and large follow-up fluctuations in the unit’s coal, water, and wind systems, which even seriously affected the safe and stable operation of the unit

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