Specified subharmonic compensation method of hybrid active filter

A technology of source filter and compensation method, applied in AC network to reduce harmonic/ripple, output power conversion device, electrical components, etc., to reduce calculation amount, reduce inverter capacity, and avoid grid parameter drift Effect

Pending Publication Date: 2022-06-28
慈溪市输变电工程有限公司 +1
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Problems solved by technology

[0003] Aiming at the problem that the prior art cannot simply and stably compensate the specified order harmonic, the present invention provides a method for compensating the specified order harmonic of the hybrid active filter, by combining the active Part of the control is equivalent to a virtual capacitor to achieve the effect of a multi-tuned filter, and can overcome the influence of grid frequency drift and L, C parameter errors

Method used

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  • Specified subharmonic compensation method of hybrid active filter
  • Specified subharmonic compensation method of hybrid active filter
  • Specified subharmonic compensation method of hybrid active filter

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Embodiment

[0033] A specified harmonic compensation method for a hybrid active filter, comprising the following steps:

[0034] Sampling the voltage across the capacitor C in the LC single-tuned filter of the hybrid active filter to obtain the capacitor voltage v c ; to capacitor voltage v C Perform harmonic component extraction to obtain its harmonic voltage component v Ch.i , where i∈G, G is the specified sub-harmonic set, the typical value is G={5,7,11,13…};

[0035] According to the obtained harmonic voltage components, the output reference voltage control rate of the voltage source inverter of the hybrid active filter for the i-th harmonic compensation is set to v h.i =λ i ·v Ch.i , where v h.i is the i-th component of the output reference voltage of the voltage source inverter; λ i is the control parameter of active tuning for the i-th harmonic, and its size is adaptively adjusted by the disturbance observation method, then the output reference voltage of the voltage source i...

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Abstract

The invention discloses a specified sub-harmonic compensation method for a hybrid active filter, and the method enables a voltage source inverter to be simulated into a virtual capacitor in a harmonic domain, and the capacitance value of the voltage source inverter can be adaptively adjusted through a perturbation observation method, so that an LC filter and the virtual capacitor can generate series resonance at the specified sub-harmonic frequency, and the harmonic compensation precision is improved. The effect of a multi-tuned filter is achieved, so that the filtering characteristic of the LC single-tuned filter is greatly improved; the control method has the advantages of being simple in control structure, easy to implement and good in filtering effect.

Description

technical field [0001] The invention relates to the field of harmonic compensation for power quality control, in particular to a specified harmonic compensation method for a hybrid active filter. Background technique [0002] The continuous growth and application of power electronic devices such as nonlinear loads and distributed power sources have brought serious harmonic pollution to the power system. Harmonics will reduce power quality, affect the reliability of power grid operation, cause line energy loss and endanger equipment safety and so on. The traditional method of controlling harmonic pollution in power system mainly adopts passive power filter (PPF). The PPF is generally composed of a single-tuned or multiple-tuned LC filter, which achieves the purpose of harmonic filtering by providing a low-impedance path for specific harmonic currents. Although PPF has the advantages of low cost and high efficiency, it also has some inherent disadvantages, such as grid frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02M7/537H02M1/088
CPCH02J3/01H02M7/537H02M1/088
Inventor 童灵华沈科炬童可君余金伟张益军罗立华高栋寅胡科杰郑思航
Owner 慈溪市输变电工程有限公司
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