Voltage sag action characteristic modeling method for low-voltage trip
A technology of low-voltage tripping and voltage sag, which is applied in the direction of instruments, electrical digital data processing, and special data processing applications, etc., can solve problems such as the inability to clearly define the action of low-voltage trippers, and achieve strong practicability and popularization. The effect of reducing economic losses and improving the ability to withstand voltage sags
Active Publication Date: 2015-07-15
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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[0004] The purpose of the present invention is to provide a modeling method for the voltage sag action characteristic of a low-voltage release to solve the problem that the prior art cannot clearly define the action of the low-voltage release under the action of a voltage sag
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[0019] In order to make the purpose of the invention, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.
[0020] see figure 1 , the voltage sag action characteristic modeling method of the low-voltage release of the present invention comprises the following steps:
[0021] (1) In-depth analysis of the national standard GB / T17626.11-2008 to build a test platform.
[0022] The national standard GB / T17626.11-2008 gives several test layout examples for the voltage sag immunity of electrical equipment. Combining with the single-phase working mode in the actual operation of the low-voltage release, the invention constructs a low...
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The invention discloses a voltage sag action characteristic modeling method for a low-voltage trip. The method comprises the following steps: constructing a testing platform, performing testing, recording the action times of the low-voltage trip under the actions of different sag testing signals at a certain frequency; counting the corresponding maximum non-action duration t1 and minimum action duration t2 at different sag amplitudes and starting point phases as testing data from the action situation of the low-voltage trip; drawing voltage endurance curves of the low-voltage trip at different starting point phases on an amplitude-duration plane according to the testing data, and finding t1 and t2 corresponding to amplitudes on division points for serving as the characteristic indexes of fuzzy clustering; clustering the voltage endurance curves at different starting point phases, and performing arithmetic average processing on a plurality of groups of corresponding testing data specific to a plurality of voltage endurance curves of the same type; fitting the processed data to obtain a mathematical model of the endurance curves of the low-voltage trip.
Description
technical field [0001] The invention relates to low-voltage release technology, more specifically, to a modeling method for voltage sag action characteristics of low-voltage releases considering fuzzy clustering characteristics. Background technique [0002] The low-voltage release is widely used in the power grid as a protection device for the power grid under the conditions of overvoltage, undervoltage and loss of voltage. The problem of voltage sag has gradually become prominent and has become the most serious power quality problem affecting the normal operation of electrical equipment. In the power system, voltage sags occurred due to high-voltage short-circuit faults, and the impact of penetration caused serious incidents of false tripping of a large number of low-voltage releases in the low-voltage distribution network. Similarly, voltage sags in the low-voltage distribution network may also lead to similar serious events. Therefore, it is of great practical signific...
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IPC IPC(8): G06F19/00
Inventor 洪潮赵勇陈雁刘平欧阳森张勇军
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD