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Dynamic prediction compensation method for controlling time delay through active power filter

A power filter and control delay technology, applied in active power filtering, AC network to reduce harmonics/ripples and other directions, can solve the problem of harmonic current errors and other problems, achieve accurate compensation control delay, real-time response Effects of load variation, easy engineering

Active Publication Date: 2015-01-21
泰州学院
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Problems solved by technology

When the load current is in a stable state, the algorithm can accurately predict the harmonic current at the next moment (corresponding to the compensation phase), but when the load current changes dynamically, there will be errors in the predicted harmonic current

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  • Dynamic prediction compensation method for controlling time delay through active power filter

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Embodiment 1

[0037] Embodiment one, in figure 1 in, below n Taking the sub-positive sequence harmonic current control delay compensation as an example to analyze the principle and implementation of the inventive method, n The implementation principle of the sub-negative sequence is the same, where for n Secondary SFR synchronous rotation phase information, is the phase shift angle.

[0038] The arbitrary load current of the three-phase three-wire system is expressed as:

[0039] (1)

[0040] In the formula: k = a, b, c, m is the harmonic order ( m ≥1, here the fundamental current is regarded as a harmonic component with an order of 1), , Respectively m Positive and negative sequence components of subharmonic current.

[0041] Will , Expand as follows:

[0042] (2)

[0043] (3)

[0044] In the formula: , and , Respectively represent the first m The ampl...

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Abstract

The invention discloses a dynamic prediction compensation method for controlling the time delay through an active power filter. The method includes the steps that firstly, an abc coordinate system is defined to the transformation formula of an nth SFR (n is larger than or equal to 1 and is in positive sequence or negative sequence); secondly, at the tk moment, the three phase load currents ia, ib and ic are sampled, Cabc-dqn is adopted for transforming ia, ib and ic into the nth SFR; thirdly, a low pass filter (LPF) is used for filtering out alternating components on a dq shaft in the SFR, and the direct components Idn (K) and Iqn (K) are obtained; fourthly, a current linear error value is calculated; fifthly, the current prediction value at the tk+1 moment is calculated, and tk+1-tk is equal to Ts, wherein ts is the sampling period; sixthly, the SFR ahead phase shift delta*theta is equal to n*omega*Ts; seventhly, C dqn-abc is applied, Idn (K+1) and Iqn (K+1) are transformed into the abc coordinate system, and the nth harmonic current dynamic predication values ian, ibn and icn are obtained in real time; eighthly, ian, ibn and icn serve as the directive currents to control an active power filter (APF) to output the nth harmonic compensation currents.

Description

technical field [0001] The invention relates to a method for dynamically predicting and compensating control delay of an active power filter. Background technique [0002] At present, with the development of computer control technology, digital control technology has gradually replaced analog control technology as the active power filter (APF) control system due to its strong anti-interference ability, flexible and convenient control algorithm, and high integration. main means of implementation. However, the inherent disadvantage of the digital control system is that there is a delay. In the APF control system, the delay mainly comes from AD sampling and conversion, control algorithm implementation, etc. Due to the existence of the delay, the dynamic and static performance of the APF harmonic compensation is reduced. In response to the above problems, in recent years, people have conducted a lot of research and developed many delay compensation methods. Among them, the dela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 许胜
Owner 泰州学院