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Coordinated Control Method of Primary Frequency Modulation and AGC for Thermal Power Units

A thermal power unit and coordinated control technology, applied in the direction of AC network voltage adjustment, reducing/preventing power oscillation, etc., can solve problems such as deteriorating grid frequency, slow frequency recovery, and unmaintainable primary frequency modulation power compensation, so as to reduce risks and increase The effect of safeguarding the line of defense

Active Publication Date: 2019-03-05
ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a coordinated control method between primary frequency modulation and AGC of a thermal power unit, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the power compensation of primary frequency modulation when the AGC power command and the power compensation direction of primary frequency modulation are opposite. The amount cannot be maintained, and the frequency recovers slowly in the accident state, which leads to the problem of deteriorating the frequency of the power grid

Method used

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  • Coordinated Control Method of Primary Frequency Modulation and AGC for Thermal Power Units
  • Coordinated Control Method of Primary Frequency Modulation and AGC for Thermal Power Units

Examples

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Embodiment 1

[0021] Embodiment 1: as attached figure 1 , 2 As shown, the coordinated control method of primary frequency modulation and AGC of the thermal power unit includes the following steps:

[0022] Step 1: Under the AGC control mode, when the power grid frequency has a large change and exceeds the limit, judge the safety limit of the grid frequency, and judge whether the frequency is high through the high limit alarm module and the low limit alarm module in the frequency judgment unit 1. frequency or low frequency, at the same time, in the load judging unit 2, it is judged whether the AGC system is increasing or reducing the load through the high limit alarm module and the low limit alarm module. Enter the third step for low frequency and load reduction;

[0023] Step 2: After judging the frequency and load, do a logic AND operation on the high frequency and the increased load in the increase / decrease blocking judgment unit 3. If the high frequency and the increased load are 1 at ...

Embodiment 2

[0034] Embodiment 2: as attached figure 1 , 2 As shown, when the unit is in the AGC control mode, the frequency of the grid changes greatly. When the grid frequency is greater than 50.1Hz, the coordinated control method between the primary frequency modulation of the thermal power unit and AGC includes the following steps:

[0035] Step 1: In the frequency judging unit 1, the grid frequency passes through the high-limit alarm module. Since the limit value of the high-limit alarm module is 50.1 Hz, when the frequency is greater than 50.1 Hz, the output is 1. At this time, the grid frequency is greater than 50.1 Hz, so it is High frequency, the output is 1, and at the same time, the signal output by the second small value comparison module is compared with the signal output by the rate limit module in the subtraction block in the load judgment unit 2, and the calculated difference is greater than 1.5, The output of the high limit alarm module is 1, which is to increase the load...

Embodiment 3

[0041] Embodiment 3: as attached figure 1 , 2 As shown, when the unit is in the AGC control mode, the frequency of the power grid changes greatly. When the frequency of the power grid is less than 49.9Hz, the coordinated control method between the primary frequency modulation of the thermal power unit and AGC includes the following steps:

[0042] Step 1: In the frequency judgment unit 1, the grid frequency passes through the low-limit alarm module. Since the limit value of the low-limit alarm module is 49.9Hz, the output is 1 when the frequency is less than 49.9Hz. At this time, the grid frequency is less than 49.9Hz, so it is Low frequency, the output is 1, and the signal output by the second small value comparison module and the signal output by the rate limit module are subtracted in the subtraction block in the load judgment unit 2, and the calculated difference is less than -1.5 , so the output of the low-limit alarm module is 1, which means load reduction, and then ent...

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Abstract

The invention relates to the technical field of thermal power set coordination control, and discloses a thermal power set primary frequency modulation and AGC coordination control method. The method comprises the following steps: step one, determining whether a power network has a high frequency or a low frequency, and determining whether an AGC system increases a load or decreases the load; step two, when the high frequency and an increased load are simultaneously one, outputting the increased load and holding signals; step three, when the low frequency and a decreased load are simultaneously one, outputting the decreased load and the holding signals; step four, triggering the increased load, locking a load increasing instruction of AGC, and prioritizing a load decreasing instruction of a primary frequency modulation function; step five, triggering the decreased load, locking a load decreasing instruction of the AGC, and prioritizing a load increasing instruction of the primary frequency modulation function; step six, superposing a power compensation amount on the basis of an original AGC instruction; and step seven, after primary frequency modulation is brought into play, and the AGC system recovering a power adjustment function of a positive direction and a negative direction. According to the invention, power network frequency control is better safeguarded, and the risk of worsening a power network frequency accident is reduced.

Description

technical field [0001] The invention relates to the technical field of coordinated control of thermal power units, and relates to a coordinated control method for primary frequency modulation and AGC of thermal power units. Background technique [0002] After the thermal power unit is put into the AGC control mode, the dispatcher control system or the dispatcher will issue a power control command to the unit according to the power planning curve of the tie line, and the unit will control the steam turbine and boiler of the unit through the coordinated control system according to the power command issued by the dispatcher And other auxiliary equipment, adjust the actual power of the unit to the AGC power command. When the frequency of the grid changes greatly, the primary frequency adjustment function of the unit will perform power compensation according to the change in frequency, and the output power of the unit will be changed in a short time, resulting in the output of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/12
CPCH02J3/12H02J3/24
Inventor 徐强刘世军艾红孔德安李建龙韩宏志郜宁
Owner ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER
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