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A Network Reconfiguration Method of Power Distribution System Based on Security Domain

A technology for power distribution system and network reconfiguration, applied in AC network circuits, information technology support systems, genetic models, etc. The effect of improving calculation speed

Inactive Publication Date: 2019-03-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For a long time, there have been few studies on security-based DNR, mainly because: 1) The traditional security analysis uses the N-1 point-by-point simulation method. When the distribution network scale is large, the calculation speed of the point-by-point method is slow. Adding the N-1 analysis process to the DNR model will further increase the difficulty of network reconfiguration calculations; 2) The existing security indicators are mostly the system load loss after the N-1 fault occurs, and the goal of DNR during normal operation is Preventive or optimal control of the power grid requires indicators that can reflect the current power grid security information

Method used

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  • A Network Reconfiguration Method of Power Distribution System Based on Security Domain
  • A Network Reconfiguration Method of Power Distribution System Based on Security Domain
  • A Network Reconfiguration Method of Power Distribution System Based on Security Domain

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A security domain-based power distribution system network reconfiguration method, the power distribution system network reconfiguration method includes the following steps:

[0032] 101: Construct the security index of the distribution system security domain according to the distribution system security domain and the security boundary equation;

[0033] 102: Obtain a network reconfiguration model according to the security index of the security domain of the power distribution system, reconstruct the distribution system network through the network reconfiguration model, and obtain the final switching state of the entire network.

[0034] Among them, the steps to construct the security index of the distribution system security domain according to the distribution system security domain and the security boundary equation are as follows:

[0035] Obtain the safety distance of a single feeder;

[0036] The average feeder safety distance and the minimum feeder safety distan...

Embodiment 2

[0044] The following combines specific test data and calculation formulas to describe in detail the operation process of a distribution system network reconfiguration method based on security domains. See the following description for details:

[0045] 201: Construct the distribution system safety domain and its safety boundary equation;

[0046] The distribution system safety domain DSSR is defined as satisfying the N-1 safe operation criterion and various other operating constraints (for example: Kirchhoff’s law constraints, power flow equation constraints, node voltage amplitude constraints or radiation structure operation constraints, when specifically implemented, The embodiment of the present invention does not limit this) the set of all working points W. Among them, the working point W is an n-dimensional vector composed of all load nodes of the distribution system, that is, the security domain of the distribution system is:

[0047]

[0048] In formula (1), Ω DSSR...

Embodiment 3

[0095] A distribution network calculation example is used below to illustrate the embodiment of the present invention. The modified IEEE RBTSBUS4 is used in the calculation example: 1) the number of feeders and the scale of feeder connections are increased; 2) the load is slightly increased, reflecting the situation that the power grid is approaching the N-1 safety boundary under high load operation; 3) the capacity of feeders and main transformers is adjusted , so that the safety of N-1 is the common constraint of the feeder and the main transformer; 4) The feeder F7 and F16 contain important loads and require a larger safety margin. The length of each line is 0.5km.

[0096] Table 1 Main Transformer Data

[0097]

[0098] Table 2 Feeder data

[0099]

[0100] 1) Safety boundary calculation;

[0101] The safety boundary equation of the example is calculated as follows.

[0102]

[0103] 2) Safe distance vector SD min set up

[0104] Due to SD min is a quantitati...

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Abstract

The invention discloses a power distribution system network reconstruction method based on a safety domain. The power distribution system network reconstruction method comprises the following steps: according to a power distribution system safety domain, a safety boundary equation, constructing a safety index of the power distribution system safety domain; according to the safety index of the power distribution system safety domain, combining a genetic algorithm so as to acquire a network reconstruction model; carrying out reconstruction on a power distribution system network through the network reconstruction model so as to acquire a final switch state of the whole network. In the method, the improved genetic algorithm is used to solve the network reconstruction model so that individual ''precocity'' can be avoided; a convergence effect is good and the algorithm is stable. By using the method, a new thought is provided for application of a power distribution network safety domain theory; a good guidance effect on optimization operation of a N-1 demanding large-scale connected city power distribution network is realized.

Description

technical field [0001] The invention relates to the field of optimal operation of power distribution systems, in particular to a method for reconfiguring power distribution system networks based on security domains. Background technique [0002] Distribution Network Reconfiguration (DNR) refers to adjusting the network structure through switch operation, which is an important means to improve the safety and economy of distribution system operation. [0003] DNR mathematics is essentially a multi-constraint combinatorial optimization problem. In terms of model optimization objectives and constraints, the objectives of traditional DNR mainly include: reducing network losses, balancing loads, and improving voltage quality, while the constraints are normal state operation constraints and network radiation structure constraints. In terms of algorithms, due to the difficulty in solving multi-constrained combinatorial optimization problems, a lot of research has been devoted to im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q50/06G06N3/12H02J3/00
CPCY04S10/50
Inventor 肖峻祖国强刘佳
Owner TIANJIN UNIV
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