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Primary frequency modulation and AGC superposition control method in opening mode of hydroelectric generating set

A technology for a hydroelectric unit and a control method, which is applied to electrical components, circuit devices, AC network circuits, etc., can solve the problem that a frequency modulation cannot be performed, and achieve the effect of accurate unit load control.

Active Publication Date: 2021-04-30
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this state, when the AGC operates, if there is a frequency deviation, the frequency adjustment cannot be performed once.

Method used

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  • Primary frequency modulation and AGC superposition control method in opening mode of hydroelectric generating set
  • Primary frequency modulation and AGC superposition control method in opening mode of hydroelectric generating set

Examples

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Embodiment 1

[0024] Embodiment 1: A frequency modulation and AGC superposition control method under the opening mode of the hydroelectric unit, the method is: during the normal operation of the unit grid connection, P(i) is the current active power value of the unit, P AGC (i) is the real-time given value of the dispatching system AGC; P AGC (i)' is the real-time given value of AGC of the power plant monitoring system; the current frequency value of the system is f(i); E P The adjustment coefficient set for the unit; P ed is the rated active power of the unit; f ed is the rated frequency of the system; f sq It is the frequency dead zone of primary FM.

[0025] When the unit is connected to the grid, when the AGC alone has an instruction for frequency regulation and does not act, that is, |f ed -f(i)|≤f sq , the real-time given value of AGC of the factory monitoring system and the active power of the unit are:

[0026] P(i)=P AGC (i)'=P AGC (i)

[0027] Among them: P(i) is the curr...

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Abstract

The invention discloses a primary frequency modulation and AGC superposition control method in an opening mode of a hydroelectric generating set, which comprises the following steps: in the running process of the set, primary frequency modulation and AGC instruction actions do not need to be mutually shielded and priorities do not need to be set, and a set ACG command and a primary frequency modulation action are adopted for common superposition running. According to the method, the power value after the primary frequency modulation action is superposed on the basis that the large closed-loop active control value of a hydroelectric generating set monitoring system is the AGC scheduling new instruction value under the condition that the AGC instruction occurs simultaneously during the primary frequency modulation action, so that an AGC instruction new control value and the primary frequency modulation action value are included simultaneously under the condition that the system is closed-loop, therefore, the signal superposition of the primary frequency modulation action quantity and AGC is realized, and the unit load control is accurate.

Description

technical field [0001] The invention belongs to the technical field of closing guide vanes of hydroelectric units, and in particular relates to a frequency modulation and AGC superposition control method in the opening mode of hydroelectric units. Background technique [0002] With the construction of large-scale hydropower units, the proportion of hydropower units in the power grid is also increasing, and the problem that hydropower units affect the frequency stability of the power system is gradually reflected. The quality of regulation and the reliability of operation of hydropower units The reliability directly affects the safe and reliable operation and power quality of the hydroelectric generating set and even the power system. In the power grid, the user's demand for electric energy and the power generated by the power generation company are in a state of balance. When there is an imbalance, the power grid must be adjusted. The means of adjustment mainly include prima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/46H02J3/48
CPCH02J3/241H02J3/472H02J3/48H02J2203/20
Inventor 苏立沈春和毛成谢文经文贤馗
Owner GUIZHOU POWER GRID CO LTD
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