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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

Active Publication Date: 2018-12-07
JILIN BOAN FIRE FIGHTING EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will bring large switching losses, which is not suitable for high-power environments, and is limited by the switching frequency of power devices
Another solution is to use an EMI filter, but this increases the size and cost of the APF

Method used

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

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Embodiment Construction

[0034] Such as figure 1As shown, the parallel APF based on carrier frequency modulation technology includes a drive circuit, an H bridge, a digital modulation wave generator, a triangular carrier generator, a first comparator 11, a second comparator 12, a first inverter 21, The control circuit that the second inverter 22, the 3rd inverter 23, compensation current acquisition circuit, DC voltage acquisition circuit constitute; The output of drive circuit is connected with the control input end of H bridge; The output end of digital modulation wave generator is connected The non-inverting input of the first comparator 11 and the input of the third inverter 23, the output of the third inverter 23 is connected to the non-inverting input of the second comparator 12; the output of the triangular carrier wave generator is connected to The inverting input terminals of the first comparator 11 and the second comparator 12; the output terminal of the first comparator 11 is connected to t...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K7/06H02M1/12H02J3/01H02J3/18
CPCH02J3/01H02J3/1842H02M1/12H03K7/06Y02E40/30Y02E40/40
Inventor 陈楠黄勇刘丹威刘诗淼王艳双王博高丽辉
Owner JILIN BOAN FIRE FIGHTING EQUIP
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