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Primary frequency modulation time-phased control system and method for coal-fired generator set

A technology of generator set and control system, applied in the direction of control system, control generator, engine components, etc., can solve the problems of valve body EH leakage, valve stem breakage, insufficient primary frequency modulation contribution rate, etc., to avoid frequent shaking, reduce valve Rod breakage, the effect of meeting rapidity requirements

Pending Publication Date: 2022-01-28
HUANENG HAINAN POWER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the first frequency regulation of the coal-fired unit is put into operation, the main problems are: (1) the integral power is not enough after the frequency regulation action, that is, the contribution rate of the frequency regulation is not enough; Shaking too frequently may easily cause valve stem breakage and valve body EH leakage accidents

Method used

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  • Primary frequency modulation time-phased control system and method for coal-fired generator set
  • Primary frequency modulation time-phased control system and method for coal-fired generator set
  • Primary frequency modulation time-phased control system and method for coal-fired generator set

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Embodiment 1

[0029] refer to Figure 1~3 And 7, is the first embodiment of the present invention, this embodiment provides a kind of coal-fired generating set primary frequency modulation time division control system, comprises acquisition module 100 and processing module, acquisition module 100 is used for the actual rotational speed of steam turbine when working, And the actual rotating speed is set as the second constant, and the actual rotating speed when the steam turbine is working can be collected through the existing steam turbine tachometer; the first constant is preset inside the processing module 200, and the rated rotating speed of the steam turbine is 3000rpm, and 3000rpm is set as the second constant , and compare the first constant with the second constant to obtain the speed difference, and calculate the frequency difference power value through the speed difference; the control module 300 performs hysteresis inertia processing on the frequency difference power value, and acc...

Embodiment 2

[0035] refer to Figure 1~4 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment, a method for controlling the primary frequency modulation of a coal-fired power generation unit by time intervals, which includes: S1: setting the rated speed of the steam turbine to a first constant;

[0036] S2: collect the actual rotational speed of the steam turbine, and set the actual rotational speed as the second constant;

[0037] S3: Comparing the first constant with the second constant, and subtracting the second constant from the first constant to obtain the rotational speed difference;

[0038] S4: Calculate the frequency difference power value through the calculation of the rotational speed difference, and perform hysteresis inertia processing on the frequency difference power value;

[0039] S5: Output frequency difference power according to the positive and negative values ​​of the power difference.

[0040] S6: Input the ...

Embodiment 3

[0048] refer to Figure 5 and 6 , is the third embodiment of the present invention, which is based on the above two embodiments, in this embodiment: the modulus value of the first constant of the rated speed of the steam turbine is set to 3000.

[0049] The time-sharing switching method when the speed is low is to switch every 3 seconds when the speed of the steam turbine is lower than 3000.

[0050] The switching method when the speed is high is to switch every 3S when the speed of the steam turbine is higher than 3000.

[0051] The time-sharing switching mode of high and low speed is to switch every 3S when the speed of the steam turbine is higher or lower than 3000.

[0052] The time setting of the first lag module is generally 5-18s.

[0053] The time setting of the second lag module is generally 5-18s.

[0054] The high alarm module 21 alarm set value is 3000.

[0055] The output terminal of the first constant module of the rated speed of the steam turbine is connect...

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Abstract

The invention discloses a primary frequency modulation time-phased control system and method for a coal-fired generator set, and the system comprises an acquisition module and a processing module; the acquisition module is used for acquiring the actual rotating speed of a steam turbine during working, and setting the actual rotating speed as a second constant, wherein a first constant is preset in the processing module, the first constant is compared with the second constant to obtain a rotating speed difference value, and a frequency difference power value is calculated through the rotating speed difference value; and a control module which is used for carrying out lagging inertia processing on the frequency difference power value and outputting frequency difference power according to positive and negative values of the power difference value. According to the method, during primary frequency modulation regression, a larger value is selected and filtering processing is carried out, so that frequent shaking caused by invalid multi-action adjustment of the high-pressure control valve is avoided, and the risks of breakage of a valve rod of the high-pressure control valve of the steam turbine and leakage of an EH oil pipeline caused by primary frequency modulation are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of control of coal-fired generating sets, in particular to a control system and method for primary frequency modulation and time division of coal-fired generating sets. Background technique [0002] Primary frequency regulation refers to the automatic control process that once the frequency of the grid deviates from the rated value, the control system of the unit in the grid will automatically control the increase or decrease of the active power of the unit, limit the change of the grid frequency, and maintain the stability of the grid frequency. When the frequency of the power grid increases, the primary frequency regulation function requires the unit to use its heat storage to quickly reduce the load, otherwise, the unit quickly increases the load. The primary frequency modulation control loop of coal-fired generating sets can generally be divided into CCS primary frequency modulation and DEH primary frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/46H02J3/48F01D17/10H02P9/04H02P101/20
CPCH02J3/241H02J3/466H02J3/48H02J3/002F01D17/10H02P9/04H02J2300/10H02P2101/20
Inventor 林崴秦建柱张和明陈耀明蔡良裕文昌璧麦发昊苏九运张运佳许建虎陈冠何有昌李博润
Owner HUANENG HAINAN POWER INC