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A reactive power and voltage emergency coordination control device and control method

A coordinated control and voltage technology, applied in circuit devices, AC network voltage adjustment, reactive power compensation, etc., can solve problems such as difficult voltage recovery, regional power grid voltage collapse, multi-DC continuous commutation failure, etc., to ensure rapidity, The effect of avoiding voltage collapse

Active Publication Date: 2021-01-22
STATE GRID SHANDONG ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the replacement effect of fed-in DC power and new energy units on conventional units leads to weak reactive power support of the system, and the receiving-end power grid with multiple DC feeds faces more serious voltage stability problems.
[0003] Moreover, the three permanent faults of important lines of the receiving end power grid may lead to the failure of multi-DC continuous commutation, and the lack of reactive power resources makes it difficult for the voltage to recover quickly, which may lead to major accidents of regional power grid voltage collapse
However, there is currently no effective device and method to quickly organize backup reactive resources in the power grid to provide voltage support after a fault occurs

Method used

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  • A reactive power and voltage emergency coordination control device and control method
  • A reactive power and voltage emergency coordination control device and control method
  • A reactive power and voltage emergency coordination control device and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1: A reactive voltage emergency coordination control device, such as figure 1 and 2 As shown, it includes AVC master station, coordination control master station, regional master station and sub-stations; AVC master station and coordination control master station have two-way communication connection, coordination control master station and each regional master station have two-way communication connection, each regional master station They are independent of each other, and each regional master station is connected with at least one sub-station for two-way communication.

[0066] Specifically, the sub-station, on the one hand, collects the voltage information of the capacitive reactor installation point and the switch position information of the capacitive reactor and transmits it to the regional master station; on the other hand, it receives and executes the instructions of the regional master station; and each sub-station ,Such as image 3 As shown, all ...

Embodiment 2

[0071] Embodiment 2: A reactive power voltage emergency coordination control method, the steps are: S1, calculate the reactive power reserve of the substation.

[0072] The reactive power reserve includes capacitive reactive power reserve and inductive reactive power reserve.

[0073] The specific steps are: S1.1, calculate the capacitive reactive power reserve of the substation.

[0074] S1.1.1, collect the voltage U of each capacitor installation point of this station x .

[0075] S1.1.2, Obtain the switch position T of each capacitor in this station x .

[0076] S1.1.3, Calculating the capacitive reactive capacity Q of the substation Cx .

[0077] Q Cx =U x ·T x ·X Cx .

[0078]

[0079]

[0080] In the formula, x refers to the xth capacitor, and 0≤x≤CNc, CNc is the number of capacitors in this station; U set Set value for pressure judgment; X Cx is the capacitive reactance of the xth capacitor.

[0081] S1.1.4, repeat steps S1.1.1-S1.1.3 until all capaci...

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Abstract

The invention discloses a reactive voltage emergency coordination control device and control method, comprising: coordinated control of a master station, a regional master station and a substation, adopting a centralized control structure, and switching capacitors and reactances according to the voltage of the regional master station and DC fault conditions device. Coordinate and control the master station to forward the fault information of the partition master station, receive the reactive voltage sensitivity information of the relevant stations issued by the AVC master station, and the regional master station collects the capacitive reactor information in the region, and synthesizes it based on the DC fault and reactive voltage sensitivity information decision making. The substation is an information collection and execution station, which can perform active switching according to the local voltage. The invention can quickly organize reactive power resources in the power grid after a fault, provide reactive power support for the power grid, and avoid voltage collapse. At the same time, the exit strategy and error prevention measures are taken into consideration to ensure the rapidity, accuracy, and accuracy of the control system action. safety.

Description

technical field [0001] The invention belongs to the technical field of power grid control, and in particular relates to a reactive voltage emergency coordination control device and a control method. Background technique [0002] With the development of power grid construction in the new era, new energy generating units are increasing day by day, and cross-regional large-capacity DC projects have been put into operation one after another. However, the replacement effect of fed-in DC power and new energy units on conventional units leads to weak reactive power support of the system, and the receiving-end grid with multiple DC feeds faces more severe voltage stability problems. [0003] Moreover, the three permanent faults of important lines of the receiving end grid may lead to the failure of multi-DC continuous commutation, and the voltage is difficult to recover quickly due to insufficient reactive power resources, which may lead to major accidents of regional grid voltage c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16H02J13/00
CPCH02J3/16H02J13/00H02J3/001Y04S10/16Y04S10/22Y02E40/30Y02E40/70Y02E60/00
Inventor 纪祥贞吴晓宾王军石庆喜梁素杰王卫波郑鹤玲刘潇涵
Owner STATE GRID SHANDONG ELECTRIC POWER