Symmetrical component method for short circuit calculation of voltage-controlled type IIDG included power distribution network

A symmetrical component method and short-circuit calculation technology, which is applied in the field of distributed power generation systems, can solve the problems of not considering the phase change of IIDG phase current and the inability to calculate the short-circuit current sequence component of voltage-type IIDG

Active Publication Date: 2016-02-03
STATE GRID CORP OF CHINA +1
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Problems solved by technology

Since the phase change of the IIDG phase current is not considered, the short-circuit current sequence compon...

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  • Symmetrical component method for short circuit calculation of voltage-controlled type IIDG included power distribution network
  • Symmetrical component method for short circuit calculation of voltage-controlled type IIDG included power distribution network
  • Symmetrical component method for short circuit calculation of voltage-controlled type IIDG included power distribution network

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[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0042] The core of the invention is to provide a short-circuit calculation symmetrical component method suitable for a voltage-type IIDG distribution network, which can realize the analytical calculation of the voltage-type IIDG short-circuit current. Using the sequence component method for short-circuit calculation can effectively reduce the complexity and solution scale of the phase component method, and the calculation of the sequence component of IIDG short-circuit current can be used for distribution network protection and its control under asymmetric faults in the distribution network. Therefore, establishing a sequence component analytical model for voltage...

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Abstract

The invention discloses a symmetrical component method for short circuit calculation of the voltage-controlled type IIDG included power distribution network. The method comprises the following steps that when the power distribution network has an asymmetric fault, the relation between the three-phase average power of the voltage-controlled type IIDG and the power of positive and negative sequence network is analyzed; a short circuit calculation sequence component model considering symmetrical control for the voltage type IIDG is established; change rule of fault current of the voltage type IIDG is obtained by combining interaction between the voltage type IIDG and the positive and negative sequence network of the power distribution network; and a symmetrical component iteration algorithm for calculating the short circuit current of the voltage-controlled type IIDG included power distribution network is provided, and the short circuit current of the voltage-controlled type IIDG included power distribution network is calculated. According to the method, sequence component method is used for short circuit calculation, the complexity and solution scale of the phase component method can be effectively reduced, and calculation of IIDG short circuit current sequence component can be applied to protection of the power distribution network and control for the power distribution network under asymmetric fault.

Description

technical field [0001] The invention relates to the technical field of distributed power generation systems, in particular to a short-circuit calculation symmetrical component method suitable for a voltage-containing IIDG distribution network. Background technique [0002] The access of distributed generation will change the power flow and short-circuit current distribution of the power grid. Among them, the inverter distributed generation (InverterInterfacedDistributedGenerator, IIDG) is widely used in distribution network and microgrid distributed generation with fast and flexible control performance. In order to achieve smooth switching between grid-connected and island modes, the IIDG in the microgrid usually adopts droop control, constant voltage and constant frequency control. For the grid-connected IIDG connected to the distribution network, constant power control is mainly used. According to the difference in tracking power in the inner loop of IIDG, its controller c...

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Application Information

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IPC IPC(8): H02H7/28
Inventor 刘敏陈慧春谢维兵敬勇周晓霞谢伟吴明燕周洪李春容兰玉彬
Owner STATE GRID CORP OF CHINA
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