A Power Decoupling Method Based on Four-Switch Three-Port DC/DC/AC Converter in DC Microgrid

Cai, Wen; Jiang, Laizhu; Liu, Bangyin; Duan, Shanxu; Zou, Changyue

doi:10.1109/tia.2014.2327162

Cited by 86 publications

(16 citation statements)

References 26 publications

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“…[6,7] (using stacked swithed capacitors for LED drivers), Refs. [8][9][10][11] and there are many more). We refer to [10,12] for nice surveys of this area.…”

Section: Introductionmentioning

confidence: 99%

The Parallel Virtual Infinite Capacitor Applied to DC-Link Voltage Filtering for Wind Turbines

2018

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Abstract:We propose the parallel virtual infinite capacitor (PVIC) concept, which refers to two virtual infinite capacitors (VIC) connected to the same DC link and sharing one capacitor, one tuned to low frequencies (LF) and one tuned to high frequencies (HF). A PVIC can suppress voltage variations (ripple) in a wider frequency range than a usual VIC. The LF-VIC is controlled by a sliding mode controller to regulate the low-frequency component of the voltage to its reference value, and by a proportional-integral (PI) controller to maintain its state of charge within the desired operating range and achieve the 'plug-and-play' pattern of PVIC. The HF-VIC is controlled by another sliding mode controller to limit the high-frequency ripples and also to keep its state of charge within a reasonable operating interval. As our main application, we use the PVIC to replace a DC-link capacitor for voltage filtering on the DC link of a doubly fed induction generator (DFIG), which is driven by a WindPact (WP) 1.5-MW wind turbine under different grid conditions with turbulent wind input. The simulation study indicates that the PVIC provides much better voltage stabilisation than a DC-link capacitor with the same capacitance, especially in the low frequency range.

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“…[6,7] (using stacked swithed capacitors for LED drivers), Refs. [8][9][10][11] and there are many more). We refer to [10,12] for nice surveys of this area.…”

Section: Introductionmentioning

confidence: 99%

The Parallel Virtual Infinite Capacitor Applied to DC-Link Voltage Filtering for Wind Turbines

2018

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“…The second approach is to use buck/boost DC/DC converters to construct two DC voltages across two capacitors that are connected in opposite polarity [16]- [18]. The sum of pulsating energy stored in the two capacitors are nearly equal to the system pulsating energy and hence, the pulsated energy does not appear on the DC bus.…”

Section: Introductionmentioning

confidence: 99%

Control of Ripple Eliminators to Improve the Power Quality of DC Systems and Reduce the Usage of Electrolytic Capacitors

et al. 2016

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The problem of voltage/current ripples has become a primary power quality issue for dc systems, which could seriously degrade the performance on both the source side and the load side and lead to reliability concerns. In this paper, a single-phase Pulse width modulation-controlled rectifier is taken as an example to investigate how active control strategies can improve the power quality of dc systems, reduce voltage ripples, and, at the same time, reduce the usage of electrolytic capacitors. The concept of ripple eliminators recently proposed in the literature is further developed, and the ratio of capacitance reduction is quantified. With such ripple eliminators, this power quality problem is formulated as a control problem to actively divert the ripple current on the dc bus. The main focus of this paper is to investigate how advanced control strategies could improve the performance of ripple eliminators. An advanced controller on the basis of the repetitive control is proposed for one possible implementation of ripple eliminators in the continuous current mode (CCM). Experimental results are presented to verify the effectiveness of the strategy with comparison to another ripple eliminator operated in the discontinuous current mode. It has been shown that the proposed instantaneous ripple-current diversion in CCM leads to a nearly fourfold improvement of performance.INDEX TERMS Instantaneous diversion of ripple currents, CCM, DCM, ripple eliminators, voltage ripples, repetitive control, reliability, electrolytic capacitors.

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“…Furthermore, Rong-Jong Wai applied coupled inductors into several topologies including H-bridge inverter, bi-directional DC-DC converter and bi-directional H-bridge converter, to serve as main topology for injecting harmonic current into the dc bus [12]. Furthermore, several new topologies are presented as inverter and rectifier with power decoupling function as well in [13,14] for power system and microgrid applications. Moreover, [15] summarized the previous method and proposed the idea of using three-port converter to achieve capacitance minimization for sing-phase inverter and rectifier.…”

Section: Introductionmentioning

confidence: 99%

An Integrated Multiport Power Converter With Small Capacitance Requirement for Switched Reluctance Motor Drive

Cai

Fan

2016

IEEE Trans. Power Electron.

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This paper presents an integrated multi-port converter (IMPC) with capacitance reduction for switched reluctance machine (SRM). The conventional drive for SRM is based on an asymmetrical H-bridge which needs large capacitor on the dc bus to absorb the transient energy caused by current commutation. The proposed topology consists of a multi-port converter which introduces the dc bus capacitor as an extra port in addition to the input port and is integrated based on switch multiplexing technique. With such converter, the required capacitance can be reduced significantly by allowing an increase of the voltage ripple on the dc bus. In addition, the current commutation process can be accelerated with high-voltage dc bus because the dc bus voltage is adjustable. The requirement of capacitance in an asymmetrical H-bridge and the proposed topology is analyzed in detail. The corresponding control method for the presented converter is introduced briefly as well. Simulation results in Matlab/Simulink and experimental waveforms verified the feasibility of the proposed topology and its superior performance as compared with asymmetrical Hbridge converter. S 0885-8993 (c)

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A Power Decoupling Method Based on Four-Switch Three-Port DC/DC/AC Converter in DC Microgrid

Cited by 86 publications

References 26 publications

The Parallel Virtual Infinite Capacitor Applied to DC-Link Voltage Filtering for Wind Turbines

The Parallel Virtual Infinite Capacitor Applied to DC-Link Voltage Filtering for Wind Turbines

Control of Ripple Eliminators to Improve the Power Quality of DC Systems and Reduce the Usage of Electrolytic Capacitors

An Integrated Multiport Power Converter With Small Capacitance Requirement for Switched Reluctance Motor Drive

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