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Three-phase reactive power optimization method of active power distribution network

An active distribution network and distribution network technology, applied in the field of automation, can solve the problems of non-decoupling of active and reactive power, lack of effective solution methods, and inability to accurately represent different types of loads.

Active Publication Date: 2015-10-14
CHINA ELECTRIC POWER RES INST +4
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Problems solved by technology

However, due to the access of distributed power sources and the inherent three-phase load imbalance, asymmetric line parameters, and non-decoupling of active and reactive power in the distribution network, the reactive power optimization of the three-phase active distribution network is inherently nonlinear. For non-convex programming problems, there is still a lack of strict effective solutions
[0003] The load in the traditional reactive power optimization mathematical model is a constant power load, which cannot accurately represent different types of load conditions in the distribution network

Method used

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  • Three-phase reactive power optimization method of active power distribution network
  • Three-phase reactive power optimization method of active power distribution network
  • Three-phase reactive power optimization method of active power distribution network

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Embodiment

[0095] Example: Apply this method to a 33-node distribution network example, and compare it with the branch and bound method in terms of time. From the results, it can be seen that the number of iterations of this method is two, and the time of each iteration is the same as that without considering the discrete The solution time of the semidefinite programming method with variable time is similar, and the total time is nearly four times shorter than that of the branch and bound method.

[0096] Such as figure 2 As shown, the specific implementation steps of solving the MISDP model based on the branch and bound method are as follows:

[0097] 1. Initialization. The subproblem queue to be branched is set to L={(RP)}, the integer solution queue is set to IL={(IP)}, and the upper and lower bounds of the MISDP model are respectively Z IP = -∞, iteration counter k = 0 and set k max .

[0098] 2. Relax the discrete variables in the MISDP model of reactive power optimization o...

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Abstract

The invention provides a three-phase reactive power optimization method of an active power distribution network. The three-phase reactive power optimization method comprises the steps of inputting trend data, and constructing a three-phase active power distribution network reactive power optimization model in consideration of an interphase mutual inductance of the branch circuit in a manner that the least value of a power distribution network active network loss is used as an objective function; converting the three-phase active power distribution network reactive power optimization model to a semi-definite programming relaxation model, and solving according to a semi-definite programming method; processing a discrete variable according to a sensitivity analysis method and a branch-and-bound method, and obtaining an iterative value; substituting the iterative value into the semi-definite programming relaxation model, and solving again until an optimization model optimal solution which contains the discrete variable. The three-phase reactive power optimization method of the active power distribution network realizes reactive power optimization calculation of a three-phase active power distribution network and furthermore realizes accurate expression for different-type load conditions in the power distribution network.

Description

technical field [0001] The invention belongs to the technical field of automation, and in particular relates to a three-phase reactive power optimization method for an active distribution network. Background technique [0002] Reactive power optimization is an important subject of distribution network operation, and there have been a lot of researches in this area. However, due to the access of distributed power sources and the inherent three-phase load imbalance, asymmetrical line parameters, and non-decoupling of active and reactive power in the distribution network, the reactive power optimization of the three-phase active distribution network is inherently nonlinear. For non-convex programming problems, there is still a lack of strict and effective solutions. [0003] The load in the traditional reactive power optimization mathematical model is a constant power load, which cannot accurately represent different types of load conditions in the distribution network. [00...

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Application Information

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IPC IPC(8): H02J3/18H02J3/26
CPCY02E40/30Y02E40/50
Inventor 蒲天骄于汀黄仁乐李时光韩巍王子安王伟吴新景杜佳桐崔琳金逸朱红
Owner CHINA ELECTRIC POWER RES INST
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