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Failure recovery method of direct-current power distribution network

A DC distribution network and fault recovery technology, applied in the field of DC distribution network, to achieve the effect of effectively restoring power supply and ensuring diversity

Pending Publication Date: 2019-06-07
HUNAN UNIV
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  • Abstract
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Problems solved by technology

[0009] The problem to be solved by the present invention is to provide a fault recovery method in the DC distribution network for the problems existing in the existing DC distribution network fault recovery method

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  • Failure recovery method of direct-current power distribution network

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Embodiment Construction

[0035] The present invention will be described in detail below with reference to the drawings and embodiments.

[0036] see figure 1 , the fault recovery method in a kind of DC distribution network of the present invention is realized through the following steps:

[0037] Step 1. Dynamically divide the network into islands according to the output forecast of the distributed power supply and the demand forecast of the load.

[0038] Considering the intermittency, randomness and load fluctuation of distributed power, the static island division that regards distributed power output and load power as definite values ​​can only maintain the system to meet the constraints within a certain period of time, so the present invention adopts A Dynamic Islanding Method Considering Time Scale. Specific steps are as follows:

[0039] (1) According to the information fed back by the Smart Terminal Unit (STU) used on the DC distribution network, determine the faulty section and isolate the ...

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Abstract

The invention discloses a failure recovery method of a direct-current power distribution network. The failure recovery method comprises the steps that firstly, after failure is cut off, the network issubjected to dynamic island dividing according to output power prediction of a distributed power source and demand prediction of loads; secondly, a network reconstruction model of the direct-currentpower distribution network is established, a suitable objective function is selected, and a binary crisscross optimization algorithm is adopted for solving under the premise of meeting the constraintcondition; and finally, if a power grid still cannot meet the constrain condition, part of the loads are cut off according to the importance degree grade of the loads till the power grid recovers to be in a qualified state. An island is divided firstly, then the network is optimized through global reconstruction, island dividing and global reconstruction are conducted once again at intervals of Ton the time scale, the optimal failure recovery strategy is realized, and power supplying can be removed more effectively.

Description

technical field [0001] The invention relates to the technical field of direct current distribution networks, in particular to a fault recovery method in a direct current distribution network. Background technique [0002] Compared with the AC distribution network, the DC distribution network has many advantages: [0003] 1. Represented by distributed photovoltaics, the access of distributed power to the DC distribution network is less than that of the AC distribution network, which improves energy utilization efficiency; [0004] 2. The DC distribution network has no reactive power loss and skin effect, which reduces line loss, has large transmission capacity, and has good economy; [0005] 3. The power quality problem of DC distribution network is easier to solve. [0006] However, the fault recovery of the DC distribution network hinders its further development. Fault recovery is a multi-objective, multi-constraint nonlinear optimization problem, which generally include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
Inventor 许加柱贾龙涛伍敏李牧远
Owner HUNAN UNIV
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