Control method and system for improving and adjusting primary frequency regulation compensation capability of extraction steam turbine unit

Abstract

The invention discloses a control method and a control system for improving and adjusting the compensation ability of primary frequency modulation of a steam extraction type steam turbine set. The control method comprises the following steps: when real-time operation frequency of a power grid exceeds a frequency modulation dead zone set by the set, separately calculating primary frequency modulation compensation instructions corresponding to a steam admission control valve and a steam exhausting valve of the set according to a frequency difference formed by real-time frequency and reference frequency of the power grid; when primary frequency modulation functions of the steam admission control valve and the steam exhausting valve are put into, if the real-time frequency of the power grid is higher than the reference frequency, calculating an instruction for reducing the opening degree of the steam admission control valve, and meanwhile, increasing the opening degree of the steam exhausting valve; and when the real-time frequency of the power grid is lower than the reference frequency of the power grid, calculating the instruction of increasing the opening degree of the steam exhausting control valve and the instruction of reducing the steam exhausting valve, and finishing the primary frequency modulation adjusting process of the set. According to the control method and the control system disclosed by the invention, the primary frequency modulation rapid compensation ability of the steam extraction type steam turbine set can be remarkably improved and adjusted.

Description

technical field [0001] The invention relates to a control method and system for improving and adjusting the primary frequency modulation compensation capability of an extraction steam turbine unit. Background technique [0002] With the rapid development of UHV power transmission and new energy construction such as wind power, nuclear power, and solar energy, the structure of regional power grids has become more and more complex, and the technical requirements for safe and stable operation of power grids are also getting higher and higher. As we all know, the predictability of new energy power generation such as wind power and solar energy is relatively poor, and the peak load of wind power generation mostly occurs at the trough of electricity consumption. At the same time, the output of new energy power generation fluctuates greatly and the controllability is relatively poor. For the adjustment of the power grid, the higher the wind power grid-connected load, the more diffi...

AI Technical Summary

Problems solved by technology

Since the steam extraction position is generally set in the high and medium pressure cylinders, the extracted steam only completes part of the work in the steam turbine, and does not perform the work process in the low-pressure cylinder, which relatively reduces the working ability of the steam entering the steam turbine. Therefore, the partial adjustment of the steam extraction The rapidity of the primary frequency regulation function of the steam turbine is greatly affected, and the rapidity index of the primary frequency regulation of the unit cannot meet the technical requirements of the power grid

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