A control strategy optimization method for primary frequency regulation reserve capacity of thermal power units
A technology of reserve capacity and optimization method, applied in the direction of control system, control generator, electrical components, etc., to achieve the effect of improving the degree of contribution
Active Publication Date: 2018-08-10
云南电力试验研究院(集团)有限公司
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Problems solved by technology
[0004] At present, the research on the primary frequency modulation reserve capacity control method of thermal power units is still in a blank stage. The main content of our research is to ensure that the units have sufficient primary frequency modulation reserve capacity by logically building in the main control system of thermal power units
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[0039] (1) Divide the main steam pressure of the unit into k sections, and confirm the maximum primary frequency adjustment of the comprehensive valve position of each pressure section
[0040] According to the fixed-slip-fixed curve of the main steam pressure of the unit, the main steam pressure is divided into k sections, and the maximum primary frequency adjustment of the integrated valve position when the unit is running in each pressure section is determined respectively;
[0041]
[0042] Among them, Fv max (P t )——the maximum primary frequency adjustment amount of the integrated valve position of the unit corresponding to the main steam pressure;
[0043] Fv max1 — is the maximum primary frequency adjustment amount of the comprehensive valve position of the first main steam pressure section determined;
[0044] Fv max1 — is the maximum primary frequency adjustment amount of the comprehensive valve position of the determined i-th main steam pressure section;
[0...
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The invention relates to a control strategy optimization method for a primary frequency modulation standby capacity of a thermal power generating unit. The method comprises the steps that (1) the main steam pressure of the generating unit is divided into k segments, and the maximal primary frequency modulation amount of an integrated valve position of each pressure segment is confirmed; (2) a limit value, which can be used to ensure normal effect of primary frequency modulation at the DEH side, of the primary frequency modulation standby capacity is determined; (3) a correction value of the primary frequency modulation standby capacity at the CCS side is determined; and (4) a calculation method of the primary frequency modulation standby capacity of the generating unit can be determined by combining the step (2) with the step (3). The method has the substantial advantages that when the DEH of the thermal power generating unit is controlled remotely by the CCS, an opening degree instruction of the integrated valve position of the unit includes certain primary frequency modulation standby capacity no matter the generating unit runs is a manual valve control or a CCS manner, and the condition that normal effect of the primary frequency modulation is influenced due to the fact that the opening degree of the integrated valve position reaches 100% is avoided. At the same time, the economical efficiency of operation of the generating unit as well as the stability of the frequency of the power grid is improved.
Description
technical field [0001] The invention belongs to the field of thermal automatic control of thermal power plants, and is a control method capable of ensuring the normal operation of the primary frequency modulation function of thermal power units. Background technique [0002] At present, the primary frequency regulation function of domestic thermal power generating units is mainly realized on the CCS side and DEH side of the unit. And when the main steam pressure of the unit is low, in order to ensure the stability of the unit load or increase the unit load, the comprehensive valve position opening of the unit often reaches 100%. At this time, if the frequency of the power grid decreases, because the comprehensive valve position is fully opened, the forward primary frequency regulation of the unit cannot function normally, which directly affects the stability of the power grid frequency. Therefore, it is an urgent requirement to study the control strategy of primary frequenc...
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IPC IPC(8): H02P9/04H02P101/20
CPCH02P9/04H02P2101/20
Inventor 李长更刘友宽
Owner 云南电力试验研究院(集团)有限公司