DC near zone multi-resource reactive voltage coordinated control method and device

A coordinated control, multi-resource technology, applied in the field of multi-resource reactive power and voltage coordinated control in the DC near area, can solve the problems of suspension, less reactive power capacity, slow response speed, etc., and achieve the effect of increasing the amount of reactive power measures

Active Publication Date: 2020-02-14
CENT CHINA BRANCH OF STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the UHV DC has a blocking fault, it will cause a large-scale transfer of the power flow of the receiving end grid, which may aggravate the power flow of the section or transmission channel, and cause problems such as low voltage suspension in severe cases.
Simply relying on the AVC system for reactive power voltage regulation not only has a slow response speed, but also has less reactive power capacity, and cannot make reasonable use of various reactive power resources in the DC near area.

Method used

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  • DC near zone multi-resource reactive voltage coordinated control method and device
  • DC near zone multi-resource reactive voltage coordinated control method and device
  • DC near zone multi-resource reactive voltage coordinated control method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0062] This embodiment is a coordinated control method for multi-resource reactive power and voltage in the DC near area, including:

[0063] Real-time acquisition of DC blocking signal detection information;

[0064] Screen the substations with the busbar voltage lower than the first preset threshold in the nearby substation, and the substations with available capacitance or available reactance, as the adjustable substations;

[0065] Responding to the detection information of the DC blocking signal indicating that the DC blocking has occurred, obtaining the detection data of the bus voltage of the DC near-area substation;

[0066] In response to the bus voltage of any DC near-area substation being lower than the second preset threshold, and there is at least one adjustable substation, at least perform the following operation a, or perform operation a and operation b sequentially, or perform sequentially Operate a once, operate b once, and operate a once or more, and carry o...

Embodiment 1-1

[0070] Based on Embodiment 1, the idea of ​​specific reactive power coordination control in this embodiment is as follows:

[0071] In response to the bus voltage of any DC near-area substation being lower than the second preset threshold, if the number of adjustable substations is at least one, perform operation a at least once, or perform operation a and operation b in sequence until the DC near-area substation When the bus voltage is not less than the second preset threshold, or until the operation b is executed, and the current adjustable plant number is 0, the reactive power coordination control ends; If the busbar voltage of a DC near-area substation is lower than the second preset threshold, and the number of adjustable substations is at least one, the reactive power coordination control is performed only by performing operation a until the number of adjustable substations is 0, and the reactive power is terminated. coordinated control;

[0072] In response to the bus ...

Embodiment 2

[0097] Based on the same inventive concept as Embodiment 1, this embodiment provides a coordinated control method for multi-resource reactive power and voltage in the DC near area. Refer to figure 1 As shown, the methods include:

[0098] Real-time acquisition of DC blocking signal detection information;

[0099] Responding to the detection information of the DC blocking signal indicating that DC blocking has occurred, acquiring bus voltage detection data of the DC near-area substation, and judging whether the bus voltage of the DC near-area substation is lower than a second preset threshold;

[0100] In response to the bus voltage of any DC near-area substation being lower than the second preset threshold, an increment operation is performed on the preset security control number m=m+k, k is a preset increment value, and the initial value of m is m 0 ;

[0101] In response to m=m after the increment operation 0 +2k, perform operation b to operate the camera to force the exc...

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Abstract

The invention discloses a DC near zone multi-resource reactive voltage coordinated control method and device. The method comprises the following steps: acquiring DC locking signal detection information in real time; screening adjustable plant stations among near-region transformer substations; when DC locking occurs, acquiring bus voltage detection data of the DC near-zone transformer substations;and in response to the fact that the bus voltage of any DC near-region transformer substation is lower than a second preset threshold, realizing DC near-region reactive coordinated control by operating each adjustable plant station to switch on a group of capacitors or switch off a group of reactors and operating a phase modifier to carry out strong excitation. A reactive power control means is added by fully utilizing the reactive power capability of the DC near-zone phase modifier and the low capacitance/low reactance in each transformer substation. By reasonably setting action turns, the voltage is increased to the maximum extent on the premise of ensuring that the voltage does not exceed the limit. By fully and reasonably utilizing the reactive power resources of a DC near region, theproblem of low-voltage suspension is solved, and safe and stable operation of a power grid is ensured.

Description

technical field [0001] The invention relates to the technical field of electric power system and automation thereof, in particular to a method and device for coordinated control of reactive power and voltage of multiple resources in the direct current near area. Background technique [0002] The distribution of natural resources in my country is uneven, the degree of economic development in each region is different, and the distribution of primary energy and load is reversed. In order to balance energy supply and demand on a larger scale, realize the rational use of cross-regional energy, and quickly and effectively transport clean energy, power grid companies are focusing on Develop long-distance, large-capacity UHV DC technology. However, when a blocking fault occurs in the UHV DC, the power flow of the receiving power grid will be shifted in a large range, which may aggravate the power flow of the section or transmission channel, and cause problems such as low voltage susp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/24
CPCH02J3/24H02J3/48
Inventor 邵德军郜建良徐友平潘晓杰党杰姜文立张三洪刘福锁黄畅想李威张倩
Owner CENT CHINA BRANCH OF STATE GRID CORP OF CHINA
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