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Low-voltage power distribution short-circuit current peak prediction method

A short-circuit current and prediction method technology, which is applied in the directions of AC/pulse peak measurement, current/voltage measurement, and measurement devices, can solve problems such as unsatisfactory prediction results and increase the number of original short-circuit measurement data, so as to ensure safety and Continuity, fast program operation, and hazard mitigation effects

Inactive Publication Date: 2015-11-04
XIAMEN UNIV OF TECH
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Problems solved by technology

Even if the GM(1,1) model whitening equation development coefficient and gray action are continuously corrected, and the number of original short-circuit measurement data is increased, the residual error can only be reduced to a limited extent, and the prediction effect is still very unsatisfactory

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  • Low-voltage power distribution short-circuit current peak prediction method
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Embodiment Construction

[0032] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0033] like figure 1 As shown, a low-voltage power distribution short-circuit current peak prediction method includes the following steps:

[0034] S1: Collect the short-circuit current data of the low-voltage power distribution system and the initial phase angle of the power supply voltage during short-circuit.

[0035] In order to realize the early prediction of the short-circuit current peak value, a small amount of short-circuit current data and the initial phase angle of the power supply voltage when the short-circuit occurs must be known on the basis of the short-circuit fault on the line. Therefore, it is necessary to detect the zero-crossing point of the line current and voltage online in real time. The principle of the detection circuit is as follows: figure 2 shown. After using the optical coupling device to detect the voltage u(t) cros...

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Abstract

The invention discloses a low-voltage power distribution short-circuit current peak prediction method. On the basis that short-circuit fault early-stage diagnosis of a low-voltage power distribution system is realized, and based on a grey prediction model GM (1, 1), the invention provides an improved GM (1, 1) prediction model used for short-circuit current peak prediction. The model is capable of accurately predicting the developing trend and the peak of a short circuit current by using a small amount of collected current data and a voltage initial phase angle in a short current case. The low-voltage power distribution short-circuit current peak prediction method has the advantages that the prediction precision is high, the data processing amount is small, the operation amount is small, the program operation speed is high, etc; in addition, real-time realization of the method on a hardware system is facilitated, and after peak prediction is utilized to realize early-stage global selectively protection over front and rear circuit breakers of the low-voltage power distribution system, the damages of the short circuit to lines and equipment are substantially reduced, so that the safety and the continuity of power supplying lines are further improved.

Description

technical field [0001] The invention relates to the field of low-voltage power distribution system protection, in particular to a method for predicting the peak value of low-voltage power distribution short-circuit current. Background technique [0002] Short-circuit fault is one of the common faults in low-voltage power distribution system, which brings great harm to the power supply system and users. The main goal of the smart grid is to ensure the reliability and continuity of power supply. For the low-voltage power distribution system, an important means to achieve this goal is to adopt selective protection, which can be realized by using the reasonable cooperation of the three-stage protection of the front and rear circuit breakers. Local selective protection, after structural modification of the circuit breaker (such as the introduction of current-limiting auxiliary circuits, double breakpoints), global selective protection can be realized. However, because the circui...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R19/04
Inventor 陈志英陈丽安赵晶
Owner XIAMEN UNIV OF TECH
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