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A method for optimize parallel restoration of AC/DC hybrid power system

An AC-DC hybrid and DC transmission system technology, which is applied in AC network circuits, power transmission AC networks, circuit devices, etc., to accelerate the recovery process, improve collaborative recovery capabilities, and shorten system power outages.

Active Publication Date: 2019-01-04
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the effect of the current system restoration technology still needs to be further improved, it is necessary to give full play to the characteristics of different types of high-voltage direct current and provide an efficient power system restoration method

Method used

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  • A method for optimize parallel restoration of AC/DC hybrid power system
  • A method for optimize parallel restoration of AC/DC hybrid power system
  • A method for optimize parallel restoration of AC/DC hybrid power system

Examples

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Embodiment 1

[0052] figure 1 For the processing flow chart of a parallel recovery optimization decision-making method for an AC / DC hybrid power system provided in Embodiment 1 of the present invention, refer to figure 1 , including the following steps:

[0053] S1: Determine the range of sub-areas divided by the power outage grid and the black start power supply of each sub-area, and convert the receiving terminal node of the boundary DC transmission system of the power outage grid into a power supply node;

[0054] Preferably, before determining the range of sub-areas divided by the power outage grid, the outage power grid can be abstracted into a weighted undirected graph. The above-mentioned black start power supply refers to a power supply with self-starting capability, such as hydroelectric power generation, wind power generation, etc., which can be started without obtaining electric energy from the system.

[0055] S2: Search the shortest power transmission path from the black star...

Embodiment 2

[0087] figure 2 For the schematic diagram of the power system topology provided by Embodiment 2 of the present invention, refer to figure 2 , the system has a total of 8 generating units, of which G30 and G33 are black start units, and the rest are non-black start units; there are 46 branches in total, including lines and transformers, of which branch 16-17 is flexible high voltage DC (High Voltage Direct Current, HVDC) line, and the rest of the branches are AC. Nodes 32 and 37 are respectively connected to different external grids through conventional HVDC lines. DC lines 16-17, AC lines 2-3, 8-9, 17-18 divide the system into two sub-areas: sub-area 1 uses G30 as the black-start unit, and sub-area 2 uses G33 as the black-start unit. The system parameters are shown in Table 1 and Table 2:

[0088] Table 1 Power supply characteristic parameters

[0089] node

C / MW

P s / MW

k / MW·h -1

Start time / min

T H / min

30

1040

0

625

...

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Abstract

A method for optimize parallel restoration of AC / DC hybrid power system include such steps as considering DC system at that boundary of blackout grid, determining the sub-area range of blackout grid and black-start power supply of each sub-area, and converting the receiving end node of boundary DC transmission system into power supply node. Searching the shortest power transmission path of each power supply node, and calculating a recovery efficiency value f; In the process of multi-sub-area simultaneous restoration, the sub-area of HVDC connection system is connected in parallel to realize the resource sharing of sub-area by selecting the regional power node with the largest restoration efficiency value f. The invention forms a restoration scheme aiming at maximizing the restoration efficiency by utilizing the fast controllable characteristic of the high-voltage direct current, accelerates the restoration process of the whole system and shortens the power outage time of the system.

Description

technical field [0001] The invention relates to the field of restoration control of a hybrid power system, in particular to an optimal decision-making method for parallel restoration of an AC / DC hybrid power system. Background technique [0002] Large-scale power outages in the power system often cause huge economic losses and adverse social impacts, and sometimes even endanger life safety. Therefore, it is necessary to study scientific and effective system recovery methods and formulate system recovery programs to deal with large-scale power outages. At present, most of the traditional power system recovery methods are based on the application of the AC power grid. After a major blackout occurs, the method of partition parallel recovery is usually adopted, and the conventional black-start unit is used as the non-black-start unit in the sub-area. Provides starting power. After the recovery of each sub-area is completed, each sub-area will run synchronously and in parallel....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 和敬涵许寅张沛李长城
Owner BEIJING JIAOTONG UNIV
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