Harmonic source modeling method based on actual measured current characteristic curve fitting
A characteristic curve and measured current technology, applied in the field of harmonic source modeling, can solve problems such as inapplicability and complex model structure, and achieve the effects of strong versatility, high model accuracy, and analog output
Active Publication Date: 2015-04-01
STATE GRID CORP OF CHINA +2
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Problems solved by technology
[0006] The characteristics of using this method to build the harmonic current source model of load equipment: first, the model structure is relatively complex, and when the specific structures of different load equipment are different in practice, the model needs to be rebuilt; second, the harmonic current generated by the model belongs to The ideal situation in theoretical research is different from the measured current of actual equipment; the third is that it is suitable for DC-powered load equipment using power electronics technology, but not suitable for AC-powered load equipment
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[0045] The present invention will be further described by taking the model of a certain rolling mill equipment as an example below in conjunction with the accompanying drawings and embodiments.
[0046] In the present invention, based on the measured current waveform characteristic curve fitting, the principle of harmonic source modeling is carried out, such as figure 1 shown.
[0047] Taking the modeling of a rolling mill equipment with a voltage level of 10 kV as an example, the implementation steps are as follows:
[0048] (1) Test the actual voltage and current of the rolling mill equipment
[0049] When modeling a rolling mill equipment with a voltage level of 10KV, the actual voltage and current tests are first carried out, and the measurement point is selected as the incoming line of the 10KV power line of the rolling mill equipment. The actual voltage and current waveforms of the rolling mill equipment in a typical time period are tested for at least one complete cyc...
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The invention discloses a harmonic source modeling method based on actual measured current characteristic curve fitting. The harmonic source modeling method based on the actual measured current characteristic curve fitting is characterized by comprising the following steps: testing an actual voltage waveform and an actual current waveform of a non-linear load device, generating a benchmark voltage waveform according to the actual voltage waveform, drawing an actual measured current characteristic curve, adopting a subsection mode to conduct polynomial fitting on the actual measured current characteristic curve, and programming to achieve harmonic source model output control according to fitting results. The harmonic source modeling method based on the actual measured current characteristic curve fitting is simple in structure, novel and unique in method, and capable of reproducing the actual current waveform in a high-accuracy mode.
Description
technical field [0001] The invention relates to a harmonic source modeling method, in particular to a harmonic source modeling method based on measured current characteristic curve fitting, which can be applied to the simulation of the harmonic source and the design of harmonic control equipment. Background technique [0002] With the extensive use of various nonlinear load equipment in the power system, the harmonic interference caused by these nonlinear load equipment to the power grid is also increasing. According to the type of current and voltage harmonics introduced by the nonlinear load in the power network, it can be divided into current source nonlinear load equipment and voltage source nonlinear load equipment. Since the nonlinear load equipment in the actual power network is mostly Current source-type nonlinear load, so the nonlinear load in the power network is modeled as a harmonic current source, which can conduct system simulation research on the harmonic infl...
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IPC IPC(8): G01R23/16
Inventor 赵晋邹舒朱渝宁燕翚付永生贺春李涛魏孟钢何砚德田玉昆才志远
Owner STATE GRID CORP OF CHINA