Fault current limiter input control method based on short-circuit current comprehensive information

A fault current limiter, integrated information technology, applied in the field of power system, can solve problems such as difficulty in ensuring accuracy, achieve the effect of ensuring safe and stable operation, avoiding insufficient breaking capacity, and preventing misjudgment

Active Publication Date: 2019-11-29
XI AN JIAOTONG UNIV
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Problems solved by technology

The target extracted by the above method has a significant correlation with the voltage phase angle of the fault point, and the phase angle is random, so it is difficult to guarantee the accuracy of control only by using the transient component as the only basis

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  • Fault current limiter input control method based on short-circuit current comprehensive information
  • Fault current limiter input control method based on short-circuit current comprehensive information
  • Fault current limiter input control method based on short-circuit current comprehensive information

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Embodiment Construction

[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0050] Such as figure 1 As shown, the simulation model of the 330kV double-ended transmission system is given. The capacity of a single generator is 2200MV·A, the capacity of a single transformer is 2200MV·A, the transformation ratio is 330 / 20, and the load of a single bus is (1600+ j400)MV·A, the length of the single-circuit line is 100km, the positive sequence impedance is (3.63+j50.03)Ω, and the zero sequence impedance is (37.96+j 132.78)Ω.

[0051] Such as figure 2As shown, the structure topology of the arc current transfer current limiter is given. The dotted line part is the main body of the current limiter, which is composed of a measurement and control unit, a fast switch and a current limiting reactor. When the system is running normally, the fast switch is closed, and the loss is approximately zero; when the measurement and contro...

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Abstract

The invention discloses a fault current limiter input control method based on short-circuit current comprehensive information. The method comprises the steps of: extracting high-frequency and low-frequency energy of a collected fault current signal; if a high-frequency energy determination result meets the requirement, putting a fault current limiter immediately into use, otherwise, extracting a power frequency component, and determining whether the fault current limiter is put into use or not again according to the determination results of the low-frequency energy and the power frequency component; and finally, waiting for action of a relay protection device and fault isolation of a circuit breaker. According to the method, the fault current limiter can be rapidly and accurately put intouse, and the method has important practical significance for guaranteeing safe and stable operation of a power system.

Description

technical field [0001] The invention belongs to the field of electric power systems, relates to the technical field of fault current limiter control, and in particular relates to an input control method for a fault current limiter. Background technique [0002] With the expansion of the interconnected power grid, the level of short-circuit current continues to rise, and the hidden dangers of insufficient breaking capacity of circuit breakers and insufficient dynamic and thermal stability of equipment are highlighted, which seriously threatens the safe and reliable operation of the power system. In view of the above problems, installing a fault current limiter is a relatively economical, simple and feasible solution. There are many types of fault current limiters, and from the aspects of technical possibility and economy, the practical application value of the arc current transfer type current limiter based on conventional electrical equipment is relatively high. This type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
CPCH02H9/021
Inventor 郝治国谢凡张保会李子昂胡秀明李丹阳徐靖东
Owner XI AN JIAOTONG UNIV
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