Low frequency ripple current compensation with DC active filter for the single-phase aeronautic static inverter

The existence of the double grid frequency (100 Hz) ripple current in dc/ac dual active bridge (DAB) power converters can degrade their performance and as such these ripples need to be compensated. An active power decoupling method is proposed in this paper to attenuate the 100-Hz current ripple in single phase dc/ac DAB converters. Compared to other current ripple reduction methods for which additional switches are used, the proposed method does not require any additional switching components thus decreasing the system cost. In the proposed method, the existing switching devices of the primary side full bridge converter and an LLC circuit integrated to form a 100-Hz ripple current reduction circuit, which is controlled by regulating the duty cycle of the primary full bridge converter switching legs. The mathematical analysis and the circuit parameter design methods are proposed. In addition, a current sharing method is proposed to keep the currents of the inductors in the LLC circuit are balanced against any possible circuit parameter deviations. The effectiveness of the developed method is evaluated through the simulation and experimental tests.

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“…In Fig. 3, if L r1 = L r2 = L r , the capacitor C r current i L can be written as (14) by using equations (4) and (5)…”

Section: Parameter Design For Ripple Steering Circuitmentioning

confidence: 99%

An Active Power Decoupling Method for Single Phase DC/AC DAB Converters

et al. 2019

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“…For voltage ripple regulation, a passive ripple filter (PRF), an active ripple filter (ARF), and an active output filter (AOF) have been introduced [4]- [13]. The PRF and the ARF show good performance with regard to reducing ripples.…”

Section: Introductionmentioning

confidence: 99%

“…The PRF and the ARF show good performance with regard to reducing ripples. However, these methods are overly sensitive to parameter errors [4]- [7], are ineffective owing to their dissipative schemes [8]- [10], or require complex and expensive components [11]- [13]. In addition, they are not suitable for the voltage fluctuation regulation.…”

Section: Introductionmentioning

confidence: 99%

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An Active Output Filter with a Novel Control Strategy for Passive Output Filter Reduction

Choi¹,

Cho²

2016

Journal of Power Electronics

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This paper presents a novel control strategy for passive output filter reduction using an active output filter. The proposed method achieves the dual-function of regulating the output voltage ripple and output voltage variation during load transients. The novel control strategy allows traditional simple voltage controllers to be used, without requiring the expensive current sensors and complex controllers used in conventional approaches. The proposed method is verified with results from a 125-W forward converter.

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