Voltage sag sorting method considering phase jumps

A technology of phase jump and classification method, which is applied in the direction of measuring current/voltage, phase angle between voltage and current, measuring electrical variables, etc. It can solve the problems of ignoring phase jump and achieve the effect of easy analysis

Active Publication Date: 2015-02-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] The purpose of the present invention is to provide a voltage sag classification method considering phase jumps, combined with short-circuit fault types, taking phase jumps into consideration on the basis of previous classifications, and propos

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  • Voltage sag sorting method considering phase jumps
  • Voltage sag sorting method considering phase jumps
  • Voltage sag sorting method considering phase jumps

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[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] The technical scheme flow chart of the present invention is as figure 2 shown. Based on the previous classification methods, the classification method in which the phase jump is considered in the present invention can be summarized as image 3 . image 3 The type 2 transformers and type 3 transformers involved in , respectively correspond to the transfer matrix T 2 and T 3 .

[0046] T 2 : For transformers with zero-sequence voltage removed, the voltage on the secondary side of the transformer is equal to the voltage on the primary side minus the zero-sequence component. Transformers belonging to this type include Yy connection transformers, Dd connection transformers, and Dz connection transformers that are not grounded on one side or both sides. Its volt...

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Abstract

The invention provides a voltage sag sorting method considering phase jumps. The method includes the following steps that firstly, three-phase voltage amplitude values and phase angles are acquired through sag recording data, three-phase phasors shown in the specification are acquired, and a phasor graph is drawn; secondly, sag information is acquired through phase voltage conditions acquired in the first step, whether three-phase voltages sag or not is judged, and three-phase jump values are calculated through the acquired voltage phase angles; thirdly, according to the sag information acquired in the second step and the sorting method, a sorting result is acquired. When the method is applied to voltage sag sorting, the defect that phase jumps are neglected in an original voltage sag sorting method can be overcome, the real condition of a power system is satisfied, and evaluative criteria and restraint measures which are formulated for power equipment sensitive to the phase jumps have certain reference value.

Description

technical field [0001] The invention belongs to the technical field of power quality analysis, in particular to a voltage sag classification method considering phase jumps. Background technique [0002] Voltage sag refers to a power quality event in which the root mean square value of the voltage drops suddenly in a short period of time due to short-circuit faults in the power system, large-scale motor startup, and transformer excitation inrush current. [0003] To analyze and evaluate the impact of voltage sag on sensitive equipment, and to take measures with better economic performance to alleviate the impact of voltage sag has become the focus of research by relevant departments at home and abroad. Before this, it is necessary to correctly understand the characteristics of voltage sag , to learn about voltage sag categories. In previous studies, researchers paid more attention to the analysis of sag amplitude and sag duration. Considering that the sag is often accompani...

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Application Information

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IPC IPC(8): G01R19/00G01R25/00G01R29/18
Inventor 徐永海兰巧倩唐亚迪
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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