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Linear approximation solution method of voltage and reactive power optimization of distribution network

A voltage reactive power optimization, linear approximation technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation and other directions, can solve problems such as low reliability

Active Publication Date: 2015-12-16
SOUTHEAST UNIV
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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the disadvantage of low solution reliability when the existing distribution network voltage and reactive power optimization technology is applied to the multi-ring distribution network, the present invention proposes a linear approximation solution for the multi-ring distribution network method

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  • Linear approximation solution method of voltage and reactive power optimization of distribution network
  • Linear approximation solution method of voltage and reactive power optimization of distribution network
  • Linear approximation solution method of voltage and reactive power optimization of distribution network

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example

[0133] Include the following steps:

[0134] 1. Acquire the network parameters, initialize the number of iterations k=0, and the error limit is error. And initialize the reactive output of each distributed power supply and capacitor bank to zero.

[0135] 2. Update the node reactive power injection and perform a power flow analysis to obtain the node voltage phase angle difference square matrix θ k and the nodal voltage magnitude vector U k .

[0136] 3. Establish the distribution network voltage and reactive power optimization model 1, and at θ=θ k ,U b =U k Linearize model 1 to model 2 at:

[0137] Model 1:

[0138] min f = Σ j ∈ 1 P 1 j ...

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Abstract

The invention, which belongs to the optimization operation field of the power system, discloses a linear approximation solution method of voltage and reactive power optimization of a distribution network. An active distribution network reactive power optimization module is established by using reactive power outputs of a distributed power supply and a discrete reactive power regulating device in a distribution network as state variables and using the operation transmission loss of the distribution network as an objective function; linearization is carried out on an active distribution network reactive power optimization module to obtain a linear approximation model; and alternate iteration is carried out on a loaf flow analysis and the linear approximation model to solve a solution approximating an original non-convex problem. According to the invention, for the distribution network design with loop network operation, the reactive power regulation capability of the distributed power supply can be fully utilized to realize coordinated cooperation with other reactive-load compensation devices; over-voltage and under-voltage problems caused by grid connection of a distributed power supply can be solved; the operation losses of the distribution network can be reduced; the capability of the distribution network for absorbing the distributed power supply can be improved; the safe and economic operation of the distribution network can be guaranteed; and the model solution becomes simple and reliable and no non-feasible solution is generated.

Description

technical field [0001] The invention relates to the field of optimal operation of power systems, in particular to a linear approximation solution method for voltage and reactive power optimization of distribution networks. Background technique [0002] Due to the intermittent and random nature of renewable energy, its massive access will have a wide impact on the distribution network, mainly in: changing the voltage level of the distribution network, improving the short-circuit capacity of the distribution network, and relay protection strategies The complexity of the network is increased, the reliability of the power supply of the network is affected, and the deterioration of the power quality is exacerbated. At the same time, with the continuous improvement of the penetration rate of distributed power in the distribution network, the traditional distribution network will gradually evolve into an active distribution network with many adjustable and controllable resources, e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 吴在军王洋徐怡悦窦晓波胡敏强
Owner SOUTHEAST UNIV
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