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Ip-iq harmonic current detection method based on instantaneous reactive power

An instantaneous reactive power, ip-iq technology, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of being susceptible to voltage distortion, low accuracy, etc. The effect of improving accuracy

Pending Publication Date: 2021-09-17
SHANGHAI DIANJI UNIV
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Problems solved by technology

However, the p-q detection method based on instantaneous reactive power is easily affected by voltage distortion when the grid voltage is distorted, and its accuracy is low.

Method used

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  • Ip-iq harmonic current detection method based on instantaneous reactive power
  • Ip-iq harmonic current detection method based on instantaneous reactive power
  • Ip-iq harmonic current detection method based on instantaneous reactive power

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Embodiment

[0031] The present invention provides an i p -i q Harmonic current detection method, this method is aimed at the traditional i p -i q The harmonic current detection method is improved in two aspects. On the one hand, the frequency adaptive filter based on the second-order generalized integrator (SOGI) principle is embedded in the control system of the second-order generalized integrator-frequency-locked loop (SOGI-FLL) to form an embedded second-order generalized integrator frequency-locked loop. (ESOGI-FLL), instead of the traditional phase-locked loop (PLL), it outputs a rotating signal with the same frequency as the voltage phase.

[0032] On the other hand, the low-pass filter is improved by connecting the average value filter and the Butterworth filter in series. Different from the traditional low-pass filter whose time delay and filtering effect are contradictory, the present invention replaces the low-pass filter with the integral, delay and gain links, the harmonic...

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Abstract

The invention relates to an ip-iq harmonic current detection method based on instantaneous reactive power. A frequency adaptive filter based on an SOGI principle is embedded into a control system of an SOGI-FLL in advance to form an ESOGI-FLL; three-phase current is converted into two-phase current ip and iq through coordinate transformation, low-pass filter series average filtering is performed on the ip and iq to obtain a direct-current component, and the dynamic response speed is shortened while the detection precision of a traditional filter is kept; an ESOGI-FLL frequency-locked loop is adopted to replace a phase-locked loop, a frequency-locked loop is adopted to replace the phase-locked loop, and a sine and cosine generator outputs a rotation signal with the same frequency as the power grid voltage signal. Compared with the prior art, the method has the advantages of easy implementation, stability, reliability, high harmonic suppression efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of power quality optimization, in particular to an instantaneous reactive power-based p -i q Harmonic current detection method. Background technique [0002] A large number of power electronic devices are connected to the power grid, which makes it necessary to consider the problem of harmonic pollution. Excessive harmonic content will damage electrical equipment and even cause serious economic losses. Harmonic detection is the premise of harmonic suppression. Only when harmonics are accurately detected, can effective harmonic suppression be performed according to the detected harmonics. When the detected harmonic voltage deviates, the system cannot perform accurate harmonics. Inhibition will affect the safe and stable operation of the system. Therefore, how to choose a suitable harmonic detection method is particularly important. [0003] At present, the common harmonic detection methods include Fourier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 姚芝森高桂革
Owner SHANGHAI DIANJI UNIV
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