Calculation method for harmonic current loss of three-phase four-wire transmission lines in distribution network
A three-phase four-wire system and transmission line technology, which is applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problems of high cost and difficulty in accurately calculating harmonic current loss, etc., and achieve low calculation cost, Save power transmission costs and achieve high calculation accuracy
Active Publication Date: 2016-09-07
SUZHOU CHINT ENTERPRISE DEV
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Problems solved by technology
At present, the power quality meter connected in parallel on the side of the bus can record the harmonic current injected into the bus, calculate the harmonic loss, and accurately design the compensation capacity and harmonic elimination parameters of the bus according to the harmonic loss, but for many outgoing lines on the bus, one by one The cost of the power quality meter for outgoing lines is too high, and it is difficult to accurately calculate the harmonic current loss of all outgoing lines if it is only arranged on the busbar
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[0023] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and any similar structures and similar changes of the present invention should be included in the protection scope of the present invention.
[0024] Such as figure 1 As shown, a method for calculating harmonic current loss of a distribution network three-phase four-wire transmission line provided by an embodiment of the present invention is characterized in that the specific steps are as follows:
[0025] 1) Set a unit time length as ⊿T, the typical value of ⊿T is 1 minute;
[0026] 2) Assuming the current time is t, the two ends of the transmission line are the first line end and the second line end respectively, and the active energy at the two ends of the transmission line at time t, t-⊿T time, and t-2⊿T time is obtained value, the average value of active energy...
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A calculation method for harmonic current loss of a three-phase four-wire system transmission line in a distribution network relates to the technical field of transmission lines and solves the technical problem of saving calculation costs and low costs. This method first uses the active energy values at both ends of the transmission line at different times to calculate the average value of active energy at both ends of the transmission line, then calculates the voltage and current at one end, and then calculates the average value of active energy at both ends. The voltage drop of the transmission line is obtained, and the harmonic current loss value of the transmission line is further calculated. The method provided by the invention is suitable for detecting three-phase four-wire transmission lines.
Description
technical field [0001] The invention relates to transmission line technology, in particular to a technique for calculating harmonic current loss of a distribution network three-phase four-wire transmission line. Background technique [0002] Power equipment usually adopts three-phase four-wire transmission lines. The harmonic current on the transmission line will cause unnecessary heat energy on the line, resulting in waste of electric energy. The calculation of the harmonic current loss of the line can be used to compensate and eliminate the harmonics of the line in a targeted manner, so as to achieve the effect of energy saving. [0003] With the increase of the power load of the distribution network terminal, in the three-phase four-wire transmission line, the current of the neutral line changes greatly, and the frequency of the harmonic current will also change continuously. At present, the power quality meter connected in parallel on the side of the bus can record the ...
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IPC IPC(8): G01R19/00
Inventor 李昌夏湘洪
Owner SUZHOU CHINT ENTERPRISE DEV