A Harmonic Source Location Analysis Method for Distributed Power Generation System

A technology of distributed power generation and analysis methods, applied in directions such as fault locations, to achieve the effect of clear calculation process, easy programming, and improved accuracy

Active Publication Date: 2016-08-24
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

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  • A Harmonic Source Location Analysis Method for Distributed Power Generation System
  • A Harmonic Source Location Analysis Method for Distributed Power Generation System
  • A Harmonic Source Location Analysis Method for Distributed Power Generation System

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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 a radial or tree distributed power generation system with N nodes and M distributed generation (DG), assuming that the first node of the system is used as a reference node and a balance node, the number of independent nodes in the system is n=N-1, The number of branches (that is, the number of tree branches) is b=n.

[0016] The directed connected graph of the rad...

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Abstract

The invention discloses a harmonic source positioning and analyzing method for a distributed power generation system. The method includes the following steps that firstly, according to the characteristic of the distributed power generation system, system parameters and all kinds of fundamental wave and harmonic wave measurement data are obtained; then, fundamental wave and all sub-harmonic voltages of all nodes of the distributed power generation system are calculated through a fundamental wave and harmonic wave state estimation method; next, fundamental and all sub-harmonic wave currents of all branch circuits of the system are respectively calculated according to fundamental wave and all sub-harmonic wave voltages of the nodes at the two ends of each branch circuit and parameters of each branch circuit; finally, injection fundamental wave currents and all sub-harmonic currents of all the nodes are calculated through a relation formula between branch circuit currents and the node injection currents, and the distribution conditions of current total harmonic distortion factors of all the nodes of the system are further calculated, so that distribution positions of all harmonic sources are accurately determined, and the characteristics are analyzed. The harmonic source positioning and analyzing method has the advantages of accurately positioning the multiple harmonic sources of the distributed power generation system and being clear in calculation process, easy to program and the like.

Description

technical field [0001] The invention belongs to the field of power system analysis and calculation, and in particular relates to a harmonic source location analysis method for a distributed power generation system. 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 the power grid 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 distributed generation technology and active distribution network (ADN) technology, more and more distributed generation (DG) is connected to the distribution network, forming a distributed generation system. The access of these distributed power sources with a large number of power electronic devices to the distribution network ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 孙永辉杨雄孙国强卫志农
Owner HOHAI UNIV
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