A power grid frequency adjustment method with coordinated control of AGC and primary frequency modulation

A technology of grid frequency and adjustment method, applied in the direction of single grid parallel feeding arrangement, etc., can solve problems such as rapid recovery of unfavorable grid frequency, inability to fully play the role of grid frequency adjustment, etc., to improve the quality of grid frequency, ensure stability, reduce the effect of risk

Active Publication Date: 2017-07-04
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, when a large power shortage occurs in the power grid and the frequency deviation of the grid is large, since the adjustment direction of the grid frequency of the AGC and the primary frequency modulation may be inconsistent, the adjustment effect of the two on the grid frequency cannot be fully utilized, which is not conducive to the rapid recovery of the grid frequency

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  • A power grid frequency adjustment method with coordinated control of AGC and primary frequency modulation
  • A power grid frequency adjustment method with coordinated control of AGC and primary frequency modulation
  • A power grid frequency adjustment method with coordinated control of AGC and primary frequency modulation

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Embodiment Construction

[0021] The implementation of the conventional power grid frequency adjustment method is the method of adjusting the grid frequency independently by the primary frequency modulation and the secondary frequency modulation, that is, the differential adjustment of the grid frequency is realized through the primary frequency modulation, and the secondary frequency modulation and non-difference adjustment of the grid frequency are realized through AGC.

[0022] (1) One frequency modulation:

[0023] The primary frequency regulation is realized by the frequency static characteristics of the generator speed control system, which only tracks the change of the grid frequency. When the grid frequency drops, the active power of the generator increases and the grid frequency increases, thereby reducing the grid frequency deviation; on the contrary, the grid frequency increases When , the active power of the generator is reduced, and the grid frequency is reduced, thereby reducing the grid f...

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Abstract

The invention discloses a grid frequency adjusting method capable of realizing coordinated control of AGC and primary frequency modulation. The method comprises the following steps: 1. inputting primary frequency modulation of a generator; 2. judging large power vacancy of a power grid; 3. judging whether the power grid frequency adjustment directions of AGC and primary frequency modulation are consistent; and 4. selecting whether to execute an AGC power grid frequency adjusting method. According to the invention, the problem that the power grid frequency adjustment directions of AGC and primary frequency modulation are inconsistent when the power grid has relatively large power vacancy is solved, coordinated control of AGC and primary frequency modulation is realized, the power grid frequency adjusting functions of AGC and primary frequency modulation are fully exerted, the risk of frequency accidents of the power grid is reduced, the stability of the power grid frequency is ensured, and the quality of the power grid frequency is improved. In addition, according to the method, the function of a conventional power grid frequency adjusting method in a normal running state is also maintained.

Description

technical field [0001] The invention relates to a power grid frequency adjustment method for coordinated control of AGC and primary frequency modulation. Background technique [0002] Grid frequency is one of the three major indicators of power quality. Ensuring grid frequency stability and grid frequency compliance is one of the important tasks of grid dispatching and operation. [0003] The conventional power grid frequency adjustment method is a method in which the primary frequency modulation and the secondary frequency modulation independently adjust the grid frequency, that is, the differential adjustment of the grid frequency is realized through the primary frequency modulation, and the secondary frequency modulation and non-difference adjustment of the grid frequency are realized through AGC. The primary frequency regulation takes the minimum frequency deviation of the grid as the control target, and increases or decreases the active power of the generator through th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/38
Inventor 宋军英张文磊黄良刚陈跃辉姜新凡
Owner STATE GRID CORP OF CHINA
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