A multi-terminal differential protection method for active distribution network based on amplitude-phase relationship

A distribution network, multi-terminal technology, applied in the field of multi-terminal differential protection of active distribution network based on amplitude-phase relationship, can solve problems such as difficult adaptation, high normal misoperation, fault refusal, etc., to achieve flexible and guaranteed setting values. The effect of swiftness

Active Publication Date: 2022-03-29
SOUTHEAST UNIV
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Problems solved by technology

As the mainstream longitudinal protection strategy, the traditional double-terminal current differential protection strategy is difficult to adapt to this multi-terminal power supply network structure, and there is a high risk of normal malfunction and fault rejection

Method used

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  • A multi-terminal differential protection method for active distribution network based on amplitude-phase relationship
  • A multi-terminal differential protection method for active distribution network based on amplitude-phase relationship
  • A multi-terminal differential protection method for active distribution network based on amplitude-phase relationship

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Embodiment Construction

[0044] Such as figure 1 As shown, a multi-terminal differential protection method for active distribution network based on amplitude-phase relationship includes the following steps:

[0045] (1) Establish short-circuit fault characteristic analysis models of three main types of distributed power sources: motor type, semi-inverter type and inverter type; analyze the faults of various distributed power sources under fault conditions according to the established distributed power source fault model Characteristics and their influence on the magnitude and phase of the short-circuit current at the fault point;

[0046] (2) According to the fault characteristics of different types of distributed power sources, analyze the amplitude-phase relationship of the three-terminal current when the multi-terminal line represented by the T-type connection is faulty inside and outside the area; according to the different positional relationship between the fault point and the protected section,...

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Abstract

The invention discloses a multi-terminal differential protection method for an active distribution network based on amplitude-phase relationship, which includes the following steps: (1) Establishing three main types of distributed power sources: motor type, semi-inversion type and inverter type Short-circuit fault characteristic analysis model; (2) According to the short-circuit fault model of three types of distributed power sources, analyze the amplitude-phase relationship of the three-terminal current when the multi-terminal line represented by the T-type connection is faulted inside and outside the area; (3) Based on the multi-terminal current amplitude correlation system, put forward a differential protection scheme, and set the start-up criterion and composite action criterion of multi-terminal current differential protection; (4) Use the multi-terminal information synchronization technology of distribution network based on fiber channel communication to realize the synchronous transmission of multi-terminal fault information. The invention can meet the protection requirements of the multi-terminal power supply network structure, and has certain reliability and quick action.

Description

technical field [0001] The invention relates to the technical field of distribution network protection, in particular to a multi-terminal differential protection method for an active distribution network based on amplitude-phase relationship. Background technique [0002] The concept of distributed power generation was born in the 1980s, which refers to the power supply with small capacity introduced near the user side in the power distribution system. With the maturity of small-scale power generation technologies such as solar energy and wind energy, scattered resources are used to meet the needs of small-scale users. [0003] Distributed power generation technology has many benefits. However, traditional distribution network protection is based on the radiation characteristics of the distribution network and the principle of selectivity. The fault area is isolated through the cooperation of protection equipment to achieve the smallest power loss range and ensure power supp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/30H02J3/38
CPCH02H7/263H02H3/302H02H3/305H02J3/381
Inventor 吴在军陈佳铭桑林卫
Owner SOUTHEAST UNIV
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