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Method for calculating short-circuit current of multiphase power distribution network containing negative-sequence current injection IIDG

A calculation method and negative-sequence current technology, which is applied in the field of multi-phase distribution network, can solve problems such as complex calculation process, and achieve the effect of fast convergence and improved calculation speed

Pending Publication Date: 2022-06-07
YUNNAN MINZU UNIV
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Problems solved by technology

The second is the structure of the distribution network. The sequence component method mostly considers the distribution network as a three-phase symmetrical structure. Although the short-circuit current calculation method in the phase component method can be used in the asymmetric distribution network structure, the calculation process is complicated.

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  • Method for calculating short-circuit current of multiphase power distribution network containing negative-sequence current injection IIDG
  • Method for calculating short-circuit current of multiphase power distribution network containing negative-sequence current injection IIDG
  • Method for calculating short-circuit current of multiphase power distribution network containing negative-sequence current injection IIDG

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Embodiment Construction

[0068] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0069] Before describing the embodiments of the present invention, the IIDG grid-connected structure is described first:

[0070] like figure 2 As shown, the distributed generation unit is connected to the grid through the inverter. When a fault occurs on the grid side, the output current of the IIDG is determined by the control strategy it executes. In the picture: V dc DC bus voltage; R f , L f , C f are the equivalent resista...

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Abstract

The invention provides a short-circuit current calculation method for a multiphase power distribution network containing a negative sequence current injection IIDG, and the method comprises the steps: building an IIDG sequence component equivalent model through analyzing the relation between the IIDG fault current and an employed control strategy; a sequence equivalent model of the unbalanced multiphase power distribution network is established by adopting a method of introducing a virtual node, a virtual line and a compensation current; a sequence node voltage equation of the multi-phase power distribution network containing the IIDG is constructed, the relation between the IIDG output current and the corresponding node voltage and the relation between the decoupling compensation current and the corresponding node voltage are revealed, and an iterative correction short-circuit current calculation method based on the superposition theorem is provided. According to the method, the feasibility and effectiveness of the calculation method are verified through simulation comparison, the calculation speed is obviously improved, and meanwhile the convergence speed of iteration errors is higher.

Description

technical field [0001] The invention relates to the technical field of multi-phase distribution networks, in particular to a method for calculating short-circuit current of multi-phase distribution networks with negative sequence current injection IIDG. Background technique [0002] At present, the penetration rate of distributed generators (DG) represented by wind energy and solar energy in the distribution network continues to increase. Distributed power generation can be divided into rotary type and inverter type according to its grid-connected interface type, and rotary DG has similar fault characteristics to traditional synchronous generators, so in the calculation of short-circuit current, the equivalent model of synchronous generators can be used. Analyze it. For IIDG, its output characteristics are nonlinear due to the influence of the control strategy, which makes the traditional short-circuit current calculation method of distribution network unsuitable. In addit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/26H02J3/16H02J3/24
CPCH02J3/381H02J3/26H02J3/16H02J3/241H02J2203/20H02J2300/20Y02E40/50
Inventor 何晋李智轩李维希李潇雨吴富磊
Owner YUNNAN MINZU UNIV
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