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Power distribution network reconstruction calculating method based on OBDD (ordered binary decision diagram)

A technology of distribution network reconstruction and binary decision diagram, applied in the field of electric power, can solve the problems of local structural defects of the power grid, complex neural network algorithms, and high requirements for computing conditions, and achieves the maximum consumption of distributed power sources and memory occupation. The effect of low power supply and high reliability of power supply

Active Publication Date: 2018-10-02
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Application Information

AI Technical Summary

Problems solved by technology

The neural network algorithm is complex and requires high operating conditions
[0012] 3) Methods such as nonlinear programming and dynamic programming are usually used in the zero-start planning process of large-scale distribution networks, which are not suitable for solving the local structural defects of existing power grids
Nonlinear programming and dynamic programming algorithms take a long time, and the algorithm is not simplified enough

Method used

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  • Power distribution network reconstruction calculating method based on OBDD (ordered binary decision diagram)
  • Power distribution network reconstruction calculating method based on OBDD (ordered binary decision diagram)
  • Power distribution network reconstruction calculating method based on OBDD (ordered binary decision diagram)

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Experimental program
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Effect test

Embodiment 1

[0062] After a fault occurs in the distribution network, taking reducing the power loss risk level of the entire distribution network as an example, the specific process of using the technical solution of this application is as follows: Figure 5 shown.

[0063] Phase 1: Build the objective function

[0064] Construct the objective function: such as formula (1). Among them, n Load is the total number of distribution network load nodes, λ k is the importance weight of node k, W i is the outage power of node i.

[0065]

[0066] The second stage: Initialize the OBDD model of the distribution network

[0067] 1) Get the system status. Including the total number of nodes N n , the on-off state of each switch branch, the load power of each node, the power of distributed power supply, the weight of each load node, etc. Sensitive loads are load nodes with uninterruptible power supply, load nodes at the end of feeders connected to distributed power sources, and other load n...

Embodiment 2

[0087] In view of the structural shortcomings of the existing power grid and the problems exposed in the reconstruction process after the distribution network fails, the reconstruction of the distribution network under normal operation mode is envisaged, such as Image 6 shown.

[0088] Phase 1: Build the objective function

[0089] Establish the minimum objective function F of network loss under normal operation mode 1 , the minimum objective function F of voltage fluctuation rate in normal operation mode 2 , The objective function F of the maximum consumption degree of distributed power generation 3 . Then the objective function is set up as (7), where λ is the weight of each objective function, and the sum of the weights is 1.

[0090] F=λ 1 f 1 +λ 2 f 2 +λ 3 f 3 (7)

[0091] The second stage: Initialize the OBDD model of the distribution network

[0092] Add or change the contact switch between distribution feeders and set it as a Boolean variable; add or chan...

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Abstract

The invention provides a power distribution network reconstruction calculating method based on an OBDD (ordered binary decision diagram), and the method comprises the steps: S1, constructing an objective function according to a target task; S2, initializing an OBDD model of a power distribution network by combining the associated data of the target task; S3, establishing a Boolean function of thepower distribution network reconstruction constraint, generating an OBDD and solving the OBDD; S4, correcting a model and constraint conditions, and carrying out the dynamic reconstruction of the distribution network. The method employs the OBDD as the core algorithm, and a networking reconstruction scheme of the power distribution network containing a distributed power supply in a fault state iscalculated, and a regulative reconstruction scheme for the structural defects of the power distribution network in a normal state is calculated, thereby achieving the purposes that the power failure risk of the power distribution network is the lowest, the consumption degree of new energy is the highest, the network loss of the power distribution network is the lowest, the voltage fluctuation ratio is the smallest and the line loads are uniformly distributed.

Description

technical field [0001] The invention mainly relates to the field of electric power technology, in particular to a distribution network reconfiguration calculation method based on an ordered binary decision diagram (OBDD). Background technique [0002] After a fault occurs in the distribution network, the circuit breaker of the distribution line trips, resulting in a power outage on the line. At this time, the end of the distribution line can form a power island centered on the distributed power supply, and combined with the state switching of the contact switch leading to other distribution lines, the power supply to important loads can be restored as much as possible and as quickly as possible . [0003] In the process of realizing the above operations, it is necessary to calculate in real time how much load the distributed power supply can carry, from which point the line switch should be disconnected, and how each line switch should be switched after the fault point is i...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 董新李莉于光波李嫣然巩晓静高峰李晓琦沈倩李广
Owner STATE GRID SHANDONG ELECTRIC POWER
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