New energy centralized frequency correction control system and control method

A frequency correction and control method technology, applied in system integration technology, information technology support system, photovoltaic power generation, etc., can solve the problems of power grid cascading instability, frequency correction control can not take into account the overall information of the power grid, etc., to avoid stability problems and reduce The risk of cascading instability and the effect of increasing grid-connected power

Active Publication Date: 2020-12-15
STATE GRID ELECTRIC POWER RES INST +4
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above shortcomings, the present invention proposes a new energy centralized frequency correction control system and control method to solve the problem that the traditional frequency correction control cannot take into account the overall information of the power grid, and in extreme cases it is easy to cause the risk of grid cascading instability

Method used

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  • New energy centralized frequency correction control system and control method
  • New energy centralized frequency correction control system and control method
  • New energy centralized frequency correction control system and control method

Examples

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Embodiment 1

[0057] see figure 1 As shown, a new energy centralized frequency correction control system includes a main station layer, a substation layer, an execution station layer and an execution layer.

[0058] There is only one control central station at the general station layer, which is used to receive information from each control sub-station and issue control measures to the control sub-station.

[0059] The substation layer includes multiple control substations. The control substations are used to receive control measures issued by the control center and issue control measures to the execution station. One new energy station is equipped with one control substation.

[0060] The execution station layer includes multiple execution stations. The execution stations are used to receive control commands from the control substations. One new energy inverter is configured with one execution station.

[0061] The execution layer includes new energy inverters of multiple new energy stati...

Embodiment 2

[0070] see figure 2 As shown, a new energy centralized frequency correction control method includes the following steps:

[0071] Step 1: The main control station obtains the preset fixed value information of the execution station, new energy grid connection information, grid operation information, and actual response control quantity information through the control substation; the new energy grid connection information, grid operation information, and actual response control information Quantity information is regularly sent to the execution station by the new energy inverter, and is generally selected to be sent every 833μs; (ie figure 2 Step 1) in

[0072] The execution station needs to set the fixed value in advance, the fixed value includes the high-frequency fixed value and the low-frequency fixed value, and the fixed values ​​set by all the executed stations are exactly the same. There are two high-frequency fixed values: the first high-frequency fixed value FH1 and...

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Abstract

The invention discloses a new energy centralized frequency correction control system and control method. The method comprises the steps of: obtaining fixed value information preset by an execution station, new energy grid-connected information, power grid operation information and actual response control quantity information; formulating a power grid frequency correction control measure accordingto the information and the acquired total load information of the power grid; and issuing the power grid frequency correction control measures to an execution station, and controlling the new energy inverter to adjust the power by the execution station. According to the invention, the rapid active power regulation capability of the new energy inverters is utilized, the frequency distribution characteristics of the power grid after serious faults and the difference control strategy of the new energy centralized frequency correction control for each new energy inverter are considered, and the refinement and reliability levels of the power grid frequency correction control are improved.

Description

technical field [0001] The invention relates to the technical field of electric power system automation control, in particular to a new energy centralized frequency correction control system and control method. Background technique [0002] With the popularization and application of UHV DC and the continuous increase in the proportion of new energy power generation, a large number of synchronous generator sets in the power grid at the sending and receiving end have been replaced, the frequency regulation ability of the power grid has dropped significantly, and faults such as AC short circuit faults, DC commutation failures, and locking It may cause a large area of ​​new energy units to go off-grid or lack of DC power, resulting in large-capacity unbalanced power in the system, and the power grid transient frequency security technology is facing severe challenges. At present, my country's grid-connected wind power and photovoltaic power generation have weak inertia or zero in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/38H02J13/00
CPCH02J3/48H02J3/381H02J13/00032H02J2300/24H02J2300/28Y04S10/12Y02E40/70
Inventor 郄朝辉张振宇王维洲李兆伟石渠吕亚洲牛拴保柯贤波霍超黄慧胡阳郝如海邵冲聂陆燕周磊祁莹陈仕彬刘福锁
Owner STATE GRID ELECTRIC POWER RES INST
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