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Harmonic power flow analysis method of distributed power generation system

A technology of distributed power generation and analysis method, applied in the direction of electrical components, circuit devices, AC network circuits, etc., to achieve the effect of overcoming the difficulty of iterative convergence, fast calculation speed, high calculation accuracy and efficiency

Active Publication Date: 2014-07-30
HOHAI UNIV
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Problems solved by technology

And these distributed generation with a large number of power electronic devices connected to the grid will definitely bring new problems and challenges to the power quality of the grid

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  • Harmonic power flow analysis method of distributed power generation system
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  • Harmonic power flow analysis method of distributed power generation system

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Embodiment Construction

[0015] 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.

[0016] figure 1 Be overall flowchart of the present invention, concrete method is as follows:

[0017] For a radial or tree-like distributed generation system with N nodes and M distributed generators (DG), assuming the first node is used as the reference node and balance node, the number of independent nodes is n=N-1, and the number of branches ( That is, the number of tree branches) is b=n.

[0018] The road of a node refers to the set of branches on the path that th...

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Abstract

The invention discloses a harmonic power flow analysis method of a distributed power generation system. The method includes the steps that firstly, according to the characteristics of distributed generation (DG) connected grids in the distributed power generation system, the operating characteristics of a DG connected grid interface power electronic device and the content of all levels of harmonic currents of a DG injection system are analyzed; secondly, fundamental wave voltage of the DG connecting grids is obtained through calculation of fundamental power flow of the distributed power generation system, and all the levels of harmonic currents of the DG injection system can be worked out through output power of DGs; finally, all the levels of harmonic currents of the DG injection system are obtained through fundamental currents of the DG injection system, and the harmonic power flow distribution situation of the whole distributed power generation system is worked out. According to the method, the distribution situation of all levels of harmonic voltage of all nodes in the system can be obtained without iterative computation, the computation speed and the computation efficiency of the harmonic power flow analysis method are increased fundamentally, the problem of harmonic power flow iteration convergence is solved, and the harmonic power flow analysis method has the advantages of being clear in computational process, easy in programming 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 power flow analysis method of a distributed power generation system. 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 the power grid system 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 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. And these distributed generation with a large number of power electronic devices connected to the grid will definitely bring new problems and challenges to the power quality of the gr...

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Application Information

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IPC IPC(8): H02J3/00
Inventor 孙永辉杨雄孙国强卫志农
Owner HOHAI UNIV
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