Variable frequency triangular carrier generator, and APF based on carrier period modulation technology

A triangular carrier and generator technology, applied in pulse frequency/rate modulation, AC network to reduce harmonics/ripple, harmonic reduction device, etc., can solve the switching frequency limitation of power devices, increase the size and cost of APF, Switching loss and other issues, to achieve harmonic suppression, good carrier frequency harmonic suppression effect, and improve the effect of THD
CN108964640AActive Publication Date: 2018-12-07JILIN BOAN FIRE FIGHTING EQUIP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JILIN BOAN FIRE FIGHTING EQUIP
Publication Date
2018-12-07

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Abstract

The invention relates to a variable frequency triangular carrier generator, and an APF based on the carrier period modulation technology and containing the generator. The generator comprises the following program modules: a variable frequency triangular carrier modulation signal generation module; a variable frequency triangular carrier frequency instantaneous value waveform generation module; a variable frequency triangular carrier generation module; and a digital variable frequency triangular carrier generation module. The variable frequency triangular carrier generator provided by the invention is used for replacing the triangular carrier generator with fixed frequency, the harmonics at the carrier frequency can be eliminated by means of the rule that the triangular carrier frequency changes with a periodic triangular signal, and the total harmonic distortion is improved while the current electromagnetic interference on an APF network side is suppressed.
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Description

technical field

[0001] The invention belongs to the field of active power filter control, in particular to a frequency-variable triangular carrier generator and a parallel active power filter based on carrier cycle modulation technology. Background technique

[0002] The parallel active power filter (Active Power Filter, APF) can effectively solve the problem of grid harmonic pollution, and it can quickly track and compensate the harmonics, negative sequence current and reactive power existing in the grid system. Traditional APF uses constant carrier frequency PWM technology to generate compensation current. According to the principle of pulse width modulation, the compensation current generated in the fixed-carrier frequency PWM converter has harmonic clusters with large amplitudes at integer multiples of the switching frequency. Therefore, although the low-order harmonics of the line current are strongly attenuated by the APF based on the constant carrier frequency PWM te...

Claims

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