A Harmonic Power Flow Analysis Method for Distributed Power Generation System Containing Weak Rings

A technology of distributed power generation and analysis methods, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as short-term ring network operation, achieve the effect of simple programming, overcoming iterative convergence difficulties, and fast calculation speed

Inactive Publication Date: 2016-11-09
HOHAI UNIV
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Problems solved by technology

On the other hand, these distributed generation systems are open-loop during normal operation, but there will also be short-term ring network operation during failure or load deployment

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  • A Harmonic Power Flow Analysis Method for Distributed Power Generation System Containing Weak Rings
  • A Harmonic Power Flow Analysis Method for Distributed Power Generation System Containing Weak Rings
  • A Harmonic Power Flow Analysis Method for Distributed Power Generation System Containing Weak Rings

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[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 distributed generation system containing weak rings 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 system is n=N-1, and the independent The number of branches, that is, the number of tree branches is c=n, the number of associated b...

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Abstract

The invention discloses a harmonic power flow analyzing method of a weak-loop-included distributed power generation system. The method comprises the following steps that firstly, the working characteristics of DG connected grid interface electrical and electronic devices and the content of all levels of harmonic currents of injection systems of DGs are analyzed according to the characteristics of distributed generation (DG) connected grids in the weak-loop-included distributed power generation system; then, through calculation of fundamental wave power flow of the system, fundamental wave voltages of all the DG connected grids is obtained and fundamental wave currents of the injection systems can be worked out according to the output power of all the DGs; finally, all the levels of harmonic currents of the injection systems of the DGs are worked out according to the fundamental wave currents of all the injection systems of the DGs, and the harmonic power flow distribution situation of the whole weak-loop-included distributed power generation system is worked out. By means of the harmonic power flow analyzing method, all-level harmonic wave voltage distribution situations of all nodes in the system can be obtained without iterative computation, therefore, the calculation speed and the calculation efficiency of the harmonic power flow analyzing method are improved fundamentally, and the problem of harmonic power flow iteration convergence is solved. The method has the advantages of 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 power flow analysis method of a distributed power generation system with a weak ring. 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 ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G06F19/00
Inventor 孙国强杨雄卫志农孙永辉
Owner HOHAI UNIV
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