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Predicting control of active power filter

A power filter and predictive control technology, applied in active power filtering, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc., can solve problems such as digital controller delay, and reduce delay. , the effect of fast convergence and high prediction accuracy

Inactive Publication Date: 2010-11-17
HUNAN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Considering that most power loads are predictable loads, and the main source of harmonic pollution in the power system—various converter devices are also predictable loads. Therefore, the active power filter chooses to use the signal prediction method to study Solve the delay problem of digital controller of active power filter

Method used

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  • Predicting control of active power filter
  • Predicting control of active power filter
  • Predicting control of active power filter

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Embodiment Construction

[0018] figure 1 Is the block diagram of the prediction algorithm based on FIR adaptive filter. The output y of an adaptive predictive filter based on the FIR model can be expressed as a linear combination of current and past inputs x:

[0019] y ^ ( n + 1 ) = Σ k = 0 N - 1 h k x ( n - k ) = H ′ · X ( n ) - - - ( 1 )

[0020] In the formula, X'(n)=[x(n), x(n-1), ..., x(n-N+1)] is the input signal vector of the adaptive predictive filter. H'=[ h 0 , h 1 ,...,h N-1 ] is the ...

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Abstract

The method includes following steps: with ip,iq algorithm, the present distortion current signal in power network before compensation gets its fundamental wave signal; with self-adaptive prediction filter, gets predicted next moment output of current fundamental wave in power network; subtract the predicted present current fundamental wave from present distortion current signal before compensation, get the present current harmonic component that is the harmonic current signal needed to compensate to active electric power filter. PWN modulation is made for the acquired harmonic component to get PWM pulse signal.

Description

technical field [0001] The patent of the invention belongs to the active power filter technology, and in particular relates to a predictive control method of an active power filter. Background technique [0002] With the development of modern industry, the power load is becoming more and more complex, forming the characteristics of large capacity and time-varying harmonics in the power system. Traditional LC passive filters are increasingly unable to meet the requirements of modern industrial applications and power systems. With the emergence of active power filters (APF), it provides an important way for grid harmonic control. The active power filter counteracts the harmonic current generated by the load by injecting a certain compensation current into the grid. Its application overcomes some shortcomings of traditional harmonic suppression methods such as LC filters. It can not only compensate for the high It can automatically adapt to the rapid changes of grid impedance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/22Y02E40/40Y02E40/20
Inventor 罗安章兢贾煜范瑞祥周柯唐杰
Owner HUNAN UNIV