Primary frequency modulation method of thermal power generating unit with no dead zone and automatically variable speed regulation

A speed change, thermal power unit technology, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of reducing the primary frequency modulation capability of the speed variation rate, damage equipment, system instability, etc. Effect

Active Publication Date: 2017-05-31
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The present invention aims at the contradiction between enhanced primary frequency modulation capability and frequent actions leading to system instability and damage to equipment under the condition of no dead zone, and the contradiction between enhancing the primary frequency modulation capability and taking into account the

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  • Primary frequency modulation method of thermal power generating unit with no dead zone and automatically variable speed regulation
  • Primary frequency modulation method of thermal power generating unit with no dead zone and automatically variable speed regulation
  • Primary frequency modulation method of thermal power generating unit with no dead zone and automatically variable speed regulation

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] When setting a frequency modulation parameter for a thermal power unit, no dead zone is set, and the speed differential is not set as a fixed value constant, but is set as a piecewise function, the function is as follows:

[0033] When Δf≤0.025Hz, δ=∞;

[0034] When 0.025Hz δ=6%+G(P,T);

[0035] When 0.025Hz δ=∞;

[0036] When 0.033Hzmax ,

[0037] When Δf≥Δf max , δ=3%+G(P,T);

[0038] So the key is to find this function.

[0039] Among them, G(P, T) needs to conduct experiments on the unit or obtain a tuning function based on historical data analysis, that is, the difference between the actual value of the speed change rate and the set value under the rated parameters under non-rated parameters. Δf max Determined according to the frequency regulation upper limit stipulated by the power grid management.

[0040] The determination of th...

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Abstract

The invention discloses a primary frequency modulation method of a thermal power generating unit with no dead zone and automatically variable speed regulation. The primary frequency modulation capacity of a thermal power generating unit requires further improvement to fulfill the background requirements of ultra-high voltage power transmission landing, progressively increasing new energy occupation, large-scale transformation of the economic structure and the like. According to the method, an automatically sampled function is constructed for the speed regulation by eliminating a dead zone on the full frequency domain, so that part of serious work conditions in the dead zone can be screened and subjected to frequency modulation, and the speed regulation out of the dead zone is linearly changed along with frequency, and the influence of main steam pressure and temperature is concerned. According to the method, the primary frequency modulation capacity of a thermal power generating unit can be improved, the damage of a speed regulation system due to over-frequent operation cannot be caused, and the stable safety performance of the unit cannot be reduced.

Description

technical field [0001] The invention belongs to the technical field of primary frequency regulation of generator sets, in particular to a method for primary frequency regulation of thermal power sets with no dead zone and automatic variable speed variation rate. Background technique [0002] Today, the power generation structure across the country is changing, and the proportion of wind power, photovoltaic and nuclear power is increasing year by year. High-voltage direct current transmission transmits electric energy to many provinces in the east. UHV transmission technology is difficult and cannot participate in the primary frequency regulation of the local power grid. At the same time, my country is in a critical period of economic structural transformation and upgrading. Variety. In this case, the task of primary frequency regulation of thermal power units will be more difficult, and the primary frequency regulation capability of thermal power units needs to be further imp...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 罗志浩陈波苏烨李泉李恒宇廖金龙盛德仁俞自涛
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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