A Dynamic Refinement Primary Frequency Modulation Control Strategy for Thermal Power Units

Abstract

The invention relates to a dynamic and refined primary frequency modulation control strategy for thermal power units, and is characterized in that: the specific control strategy is as follows: S1: optimization of frequency signal acquisition mode; S2: primary frequency modulation and automatic power generation control command conflict control; S3: small frequency difference disturbance Response lag control; S4: Precise frequency regulation based on model estimation frequency regulation integral coefficient; the control strategy adopted in the present invention can solve the problem of conflict between primary frequency regulation and automatic power generation control commands, and can solve the delay of unit regulation response under the disturbance of small frequency difference of the power grid It can solve the problem that primary frequency regulation can not achieve follow-up adaptation and precise frequency regulation for the open-loop control of the unit regulation; this control strategy improves the automatic control level of the unit in the coordination system and the steam turbine speed regulation system, and automatically and accurately makes the power generation The unit satisfies the randomness and accuracy of power grid frequency regulation.

Description

technical field [0001] The invention relates to the technical field of primary frequency modulation fine control of thermal power units, in particular to a dynamic fine primary frequency modulation control strategy for thermal power units. Background technique [0002] With the development of the industrial economy, the capacity of the national power grid has gradually increased, the structure of the power grid has become more and more complex, and the power consumption structure of users tends to be diverse. Grid frequency has become a core indicator for evaluating power supply security and power quality. Jiangsu Power Grid has added a large number of wind power, photovoltaic and biomass generating units. These new energy generating units are easily restricted by the natural environment. At the same time, large-capacity generating units suddenly trip and stop. This requires thermal power units to undertake the arduous task of primary frequency regulation, so it is an import...

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Problems solved by technology

[0004] This control strategy can meet the demand index of primary frequency regulation under most working conditions, but when there are frequency signal sampling errors, non-linear flow curve of steam turbine control door, conflict between primary frequency regulation and automatic power generation control commands, and unit frequency regulation response under small frequency difference disturbance When there are problems such as lagging, insufficient heat storage of the unit or the influence of the sliding pressure mode, it is easy to cause the unit’s primary frequency adjustment effect to be unsatisfactory.

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