Load optimization control method for thermal power units in propr mode

Abstract

The invention discloses a method for achieving optimizing control of the load of a thermal power generating unit in a PROPR mode. The method specifically comprises: step one, an AGC load instruction value issued by a dispatching center is analyzed and optimized through a function; step two, the corrected AGC load instruction value and a unit actual power value are subjected to different and judgment to generate the steam turbine master control feed-forward amount; step three, the corrected AGC load instruction value and the unit actual power value are subjected to the different and judgment to perform load change rate switching. The method performs feed-forward optimizing adjustment on a steam turbine master control of the unit by analyzing the load instruction value and the actual power value of the unit and judging the load real-time change situation of the unit, performs broken line optimizing adjustment on the load change rate of the unit, accordingly improves the adjusting accuracy and a response time index effectively while adjusting the rate index of the unit in the PROPR mode, and ensures supply and demand balance of power grid load and the stability of power grid frequency.

Description

technical field [0001] The invention relates to a thermal power unit load optimization control method, in particular to a thermal power unit load optimization control method in PROPR mode. Background technique [0002] With the rapid development of my country's power system, the capacity of the power grid is getting bigger and bigger, and the quality of electric energy is also getting higher and higher. For the safe and stable operation of the power grid, all large-scale thermal power units are required to use the AGC function, especially PROPR (etc. Adjustable ratio (normal adjustment) mode, this mode requires the load variation range of the unit to be large (generally requires 50%--100% rated load), within this range, the unit is required to respond quickly, accurately and stably to the load change demand issued by the power grid . [0003] (1) AGC assessment standards [0004] Such as figure 1 As shown in the typical AGC unit set point control process, this is a typical ...

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Problems solved by technology

[0012] The actual operation proves that this control scheme can increase the overall adjustment rate of the assessment index by artificially increasing the load change rate of the unit, but the increase of the load change rate will cause large fluctuations in the main steam pressure of the unit, thus affecting the unit load. The control accuracy has a negative impact, affecting the adjustment accuracy and response time, which will eventually lead to unsatisfactory overall assessment results. In serious cases, the quality of the operation control results is not up to standard in the scheduling assessment and evaluation.

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