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Active power distribution network harmonic source positioning analysis method

A technology of active distribution network and analysis method, applied in spectrum analysis/Fourier analysis, fault location, etc.

Inactive Publication Date: 2014-08-13
HOHAI UNIV
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  • Application Information

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Problems solved by technology

The connection of these nonlinear loads and distributed power sources with a large number of power electronic devices to the active distribution network will definitely bring new problems and challenges to the power quality of the active distribution network.

Method used

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  • Active power distribution network harmonic source positioning analysis method
  • Active power distribution network harmonic source positioning analysis method
  • Active power distribution network harmonic source positioning analysis method

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Embodiment Construction

[0013] 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.

[0014] figure 1 Be overall flowchart of the present invention, concrete method is as follows:

[0015] For an active distribution network with N nodes, K ring networks and M distributed generators (DG), 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 contact branches, th...

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Abstract

The invention discloses an active power distribution network harmonic source positioning analysis method. The method includes the following steps that according to the characteristics of an active power distribution network, network parameters and measurement data of various fundamental waves and harmonic waves are obtained; then voltage of fundamental waves of all nodes of the active power distribution network and voltage of sub-harmonic waves of the all nodes of the active power distribution network are worked out through a fundamental wave and harmonic wave state estimation method; currents of fundamental waves of all branches of the active power distribution network and currents of sub-harmonic waves of the all branches of the active power distribution network are worked out respectively according to voltage of the fundamental waves of nodes at the two ends of each branch, voltage of the sub-harmonic waves of the nodes at the two ends of each branch and branch parameters; finally, through the relationship formula of branch currents and node injection currents, node injection fundamental wave currents of each node and node injection sub-harmonic wave currents of each node are worked out, the distribution situation of current total harmonic distortion of all nodes of the active power distribution network is worked out further, therefore, distribution positions of all harmonic sources can be positioned accurately, and the characteristics of the harmonic sources are analyzed. The active power distribution network harmonic source positioning analysis method has the advantages that multiple harmonic sources of the active power distribution network are positioned accurately, the calculation process is clear, and programming is easy.

Description

technical field [0001] The invention belongs to the field of power system analysis and calculation, and in particular relates to a method for locating and analyzing harmonic sources of an active distribution network. Background technique [0002] Harmonic source location technology is an important branch in the field of harmonic research. It is a key technology for understanding the distribution characteristics of harmonic sources in active distribution networks and for harmonic control. It can calculate the exact location of harmonic sources and their key harmonic indicators. , and then propose effective measures to suppress harmonics. With the rapid development of active distribution network (ADN) technology and the continuous improvement of living standards, a large number of distributed generation (DG) and nonlinear loads are connected to active distribution network. The connection of these nonlinear loads and distributed power sources with a large number of power elect...

Claims

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Application Information

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IPC IPC(8): G01R23/16G01R31/08
Inventor 杨雄卫志农孙国强孙永辉
Owner HOHAI UNIV
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