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Power factor sampling method and power factor compensation equipment

A power factor and signal technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, electric power measurement through current/voltage, etc., can solve problems such as large deviation of power factor parameter detection

Active Publication Date: 2013-09-18
HANGZHOU ELECTRIC EQUIP MFG +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the power factor parameter detection has a large deviation when there is a large high-order harmonic component in the power grid, the present invention provides a power factor sampling method and provides equipment for realizing power factor compensation using this method, which can Overcoming the Deviation of Power Factor Detection with Simple Hardware Devices

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  • Power factor sampling method and power factor compensation equipment

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Embodiment

[0058] A power factor sampling method in this embodiment includes the following steps:

[0059] K. Obtain current signal I and voltage signal U from the power grid;

[0060] L. Use the sine wave signal M with an amplitude of 1 to multiply the I and U signals respectively to obtain the I1 and U1 signals;

[0061] M. After two-order low-pass filtering of the I1 and U1 signals, the gain is doubled to obtain the IP1 and UP1 signals;

[0062] N. Multiply the IP1 and UP1 signals by M to obtain the IP and UP signals;

[0063] O. Multiply the sine wave signal N with an amplitude of 1 and a phase difference of 90 degrees from M with the I and U signals to obtain the I2 and U2 signals;

[0064] P. After two-order low-pass filtering of the I2 and U2 signals, the gain is doubled to obtain the IQ1 and UQ1 signals;

[0065] Q. Multiply the IQ1 and UQ1 signals by N to obtain the IQ and UQ signals;

[0066] R. Add IP and IQ to get IJB signal, add UP and UQ to get UJB signal;

[0067] S. ...

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Abstract

The invention relates to a power factor sampling method and power factor compensation equipment, which aims at solving the problem of larger deviation on power factor parameter detection when a larger higher harmonic component exists in a power grid. The power factor compensation equipment comprises a microprocessor as well as a signal sampling circuit, a display circuit and a drive circuit connected with the microprocessor. The invention is not interfered by harmonic waves, does not need the support of a voltage synchronizing signal, can work stably, can additionally obtain the harmonic components of voltages and currents without complex Fourier calculation, and has extremely simple hardware circuits and a low cost.

Description

technical field [0001] The invention relates to the field of electric equipment manufacturing, and more specifically, the invention relates to a power factor sampling method and power factor compensation equipment for improving the quality of a power grid. Background technique [0002] At present, the power factor sampling technology in the grid power factor controller has gone through two stages. In the immature stage of power electronics technology, the grid harmonic problem is not obvious, the power quality is good, the waveform distortion of current and voltage is generally small, and the power factor The sampling technology is also relatively simple, that is, the zero-crossing phase difference of the detected voltage and current signals is directly calculated; with the development of power electronics technology, a large number of high-power power electronic devices are used in the power grid, and the problem of harmonics is becoming more and more serious. Voltage and cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R21/06H02J3/18
CPCY02E40/30
Inventor 陈识微蒋鲁军王家凯
Owner HANGZHOU ELECTRIC EQUIP MFG
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