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A bipolar short-circuit fault section identification and distance measurement method in a flexible DC distribution network

A flexible DC power distribution and fault section technology, which is applied in the fault location, fault detection according to the conductor type, and electrical measurement, can solve the problems of increased difficulty in fault location and fast action speed, and achieves easy implementation, concise principle, The effect of the simple ranging principle

Active Publication Date: 2022-02-18
UNIV OF JINAN
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  • Application Information

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Problems solved by technology

After a fault occurs, the protection device of the DC system operates quickly, resulting in less fault data that can be used for fault location, making fault location more difficult

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  • A bipolar short-circuit fault section identification and distance measurement method in a flexible DC distribution network
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  • A bipolar short-circuit fault section identification and distance measurement method in a flexible DC distribution network

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Embodiment Construction

[0025] A method for identifying and ranging a bipolar short-circuit fault section of a flexible DC distribution network proposed by the present invention, the embodiment is described in detail as follows:

[0026] The internal sub-module structure of the modular multilevel converter: the sub-module consists of an upper insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) T 1 , upper diode D 1 , lower part (IGBT) T 2 , the lower diode D 2 and sub-module capacitors, the capacitance value is C 0 express. by figure 1 The network structure of the flexible DC distribution network shown is to build a flexible DC distribution network, assuming that the bipolar short-circuit fault occurs in section L 3 On the fault voltage transient analysis. When a bipolar short-circuit fault occurs, according to whether the IGBT in the sub-module of the converter is blocked, the fault process is divided into two stages, two stages before and after the sub-module is blocke...

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Abstract

The invention discloses a bipolar short-circuit fault section identification and distance measurement method in a flexible DC distribution network. This paper proposes an identification algorithm for determining the fault section by using the fault transient voltage change law and a method for measuring distance and capacitance distance measurement. For the transient voltage characteristics of each section when a bipolar short-circuit fault occurs, the voltage deviation coefficient K is introduced, which is the deviation relationship between the actual instantaneous voltage at each branch bus and the normal operating voltage of the system during the fault. Determine the section where the failure occurred. For the fault location of the fault section, the fault distance measuring capacitor is switched at both ends of the fault section, and the distance measuring capacitor, line impedance and transition resistance are equivalent to an RLC series circuit, and the fault distance measurement equation is solved to realize the bipolar short circuit fault Distance measurement has the characteristics of simple principle, high sensitivity and reliability, and easy implementation.

Description

technical field [0001] The invention relates to the field of fault protection of a flexible DC distribution network, in particular to a method for identifying a bipolar short-circuit fault section of a flexible DC distribution network. Background technique [0002] Compared with the AC distribution network, the flexible DC distribution network based on the modular multilevel converter (MMC) has the following advantages: the connection between the distributed power supply and the DC load and the bus is easier, and it is easy to realize Coordinated control of each other; reduction of line cost and loss; no reactive power balance and stability problems of the AC system, high reliability of the power grid operation, etc., and become the research focus of relevant scholars at home and abroad. The fault characteristics of the flexible DC distribution network are very different from the fault characteristics of the AC system. After the fault of the DC distribution network, the faul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 王喜靖张慧芬赵锡彬
Owner UNIV OF JINAN