A Harmonic Power Flow Analysis Method for Active Distribution Network

A technology of active distribution network, analysis method, applied in the direction of electrical components, circuit devices, AC network circuits, etc.

Inactive Publication Date: 2016-03-16
HOHAI UNIV
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Problems solved by technology

With the rapid development of active distribution network (ADN) technology, more and more distributed generators (DG) are connected to active distribution network, and with the continuous improvement of science and technology and living standards, active distribution network A large number of nonlinear loads, and these nonlinear loads and distributed sources with a large number of power electronic devices will definitely bring new problems and challenges to the power quality of active distribution networks

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  • A Harmonic Power Flow Analysis Method for Active Distribution Network
  • A Harmonic Power Flow Analysis Method for Active Distribution Network
  • A Harmonic Power Flow Analysis Method for Active Distribution Network

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[0019] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0020] figure 1 Be overall flowchart of the present invention, concrete method is as follows:

[0021] For an active distribution network with N nodes, K ring networks, W nonlinear loads and M distributed generators (DGs), assuming that the first node is used as a reference node and a balance node, the number of independent nodes in the active distribution network is n=N-1, the number of independent branches, that is, the number of tree branches, is c=n, the number of a...

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Abstract

The invention discloses a harmonic load flow analysis method of an active power distribution network. The harmonic load flow analysis method comprises the steps of according to non-linear loads in the active power distribution network and characteristics of distributed generation (DG), analyzing operating characteristics of the non-linear loads and a DG grid connection interface power electronic device and contents of harmonic currents injected into the system; computing fundamental wave load flow of the active power distribution network to obtain fundamental wave voltages of the non-linear loads and the DG grid connection, and computing fundamental wave currents of the non-linear loads and the DG according to power of the non-linear loads and the DG; solving the harmonic currents injected into the active power distribution network according to the fundamental wave currents of the non-linear loads and the DG, and computing harmonic load flow distribution of the whole active power distribution network. By means of the harmonic load flow analysis method, harmonic voltage distribution of all the nodes can be obtained without iterative computations, computation speed and efficiency of the harmonic load flow analysis method are increased fundamentally, and convergence of iteration of the harmonic load flow is removed. The harmonic load flow analysis method has the advantages that a computational process is clear, and programming is achieved easily.

Description

technical field [0001] The invention belongs to the field of power system analysis and calculation, and in particular relates to a harmonic power flow analysis method of an active distribution network. Background technique [0002] Harmonic power flow calculation is an important branch in the field of harmonic research. It is an important means to understand the harmonic characteristics of active distribution network and conduct harmonic analysis. It can calculate the harmonic indicators of key nodes, and then propose effective measures to suppress harmonics. With the rapid development of active distribution network (ADN) technology, more and more distributed generators (DG) are connected to active distribution network, and with the continuous improvement of science and technology and living standards, active distribution network access A large number of nonlinear loads, and these nonlinear loads and distributed sources with a large number of power electronic devices will de...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 卫志农杨雄孙永辉孙国强
Owner HOHAI UNIV
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