Variable structure control for active power decoupling topologies

Kafanas, Georgios; Jeffrey, Mike R.; Yuan, Xibo

doi:10.1049/cp.2016.0170

Cited by 3 publications

(11 citation statements)

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“…If the buck converter discussed in Section I is replaced with a boost or buck-boost converter, equation 2still holds. Based on (2a), using boostbased [22]- [25] or buck-boost-based [26] APD solutions, the capacitance requirement can then be reduced further as the maximum allowable voltage across the capacitor, V cb(max) , can be increased beyond the dc-link voltage. This case, however, is not preferred as it fails to meet requirement (II).…”

Section: B Identification Of the State-of-the-artmentioning

confidence: 99%

“…Since the capacitance required by the buck is not significantly larger than the theoretically minimum value, it can be assumed that the buck APD also meets all of the three requirements. As these requirements are met (a) boost-based [22], [23], [25], (b) split-capacitor [13], [14], (c) dependently-controlled [10], [11], and (d) Inductive [29], [34].…”

Section: B Identification Of the State-of-the-artmentioning

confidence: 99%

“…However, as expected, the only way to achieve this purpose is to use dependently-controlled switch-sharing methods, because of the buck's simple topology. In a number of other publications, other problems are cited and either inductive [35] or boost-based [24], [25] solutions are proposed.…”

Section: Previous Attempts To Improve the Buck Apdmentioning

confidence: 99%

“…[31]- [33] [10]- [12] [13], [14] [24], [25] Optimum capacitance requirement with minimal compromise in efficiency Literature that don't mention buck.…”

Section: Previous Attempts To Improve the Buck Apdmentioning

confidence: 99%

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Buck-Plus-Unfolder as the Superior Active Power Decoupling Solution for 400 Vdc/kW-Level Applications

Sadrian

Wang

2020

IEEE Open J. Power Electron.

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In single-phase ac/dc applications where reliability and/or power-density are critical, active power decoupling (APD) circuits can be employed to reduce the required capacitance on the dc-link. Various APD circuits have been proposed so far, all with their advantages and disadvantages. However, many confusions still exist in the literature on this topic which is mainly attributed to a lack of unified and comprehensive assessment criteria. In this paper, first the decisive criteria for a modern APD circuit are established, and the buck APD is identified as the current state-of-the-art, based on them. Then the buck-plus-unfolder topology with triangular current mode (TCM) modulation is proposed as an improvement, and a simple, yet solid foundation is introduced to choose the superior decoupling solution at different specifications. The operation equations for the APD with TCM modulation are derived next, and the operation of the proposed solution is demonstrated using a hardware prototype. Index Terms-Active power decoupling, double line frequency ripple, power density, single-phase PFC, single-phase inverter, triangular current mode (TCM).

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Section: B Identification Of the State-of-the-artmentioning

confidence: 99%

Section: B Identification Of the State-of-the-artmentioning

confidence: 99%

Section: Previous Attempts To Improve the Buck Apdmentioning

confidence: 99%

“…[31]- [33] [10]- [12] [13], [14] [24], [25] Optimum capacitance requirement with minimal compromise in efficiency Literature that don't mention buck.…”

Section: Previous Attempts To Improve the Buck Apdmentioning

confidence: 99%

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Buck-Plus-Unfolder as the Superior Active Power Decoupling Solution for 400 Vdc/kW-Level Applications

Sadrian

Wang

2020

IEEE Open J. Power Electron.

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“…Several active power decoupling (APD) topologies are proposed in the literature to eliminate the need for electrolytic capacitors [16, 12, 17–26]. These topologies use an additional decoupling circuit to compensate the ripple power drawn by grid, thereby eliminating the need for high value of capacitance in the dc link.…”

Section: Introductionmentioning

confidence: 99%

Switching strategy for improving the lifetime of dc‐link capacitor in a fault‐tolerant active power decoupling topology

Kumar

Fernandes

2018

IET Power Electronics

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Reliability is an important requirement for a grid-connected photovoltaic (PV) system in remote military-secured areas, which are difficult to access for system maintenance. However, the reliability of the PV system is reduced by the use of electrolytic capacitors in inverters. Active power decoupling (APD) topologies eliminate the need for these capacitors by using an additional decoupling circuit. However, the vulnerability of switching devices to failure is another reason for reduced reliability of inverters, which is not addressed in these topologies. Several fault-tolerant topologies are proposed in literature to address this limitation. However, these topologies use electrolytic capacitors in dc-link, which affects the overall reliability of inverter. To address these limitations, a fault-tolerant strategy is proposed in this study. In the proposed strategy, a conventional APD topology is used along with an electrolytic capacitor in the dc-link. The lifetime of the capacitor is improved using the decoupling circuit of the APD topology. In this regard, a switching strategy is proposed, using which the current flowing through dc-link capacitor is reduced. Furthermore, in the event of a device fault, the topology continues to function like the conventional Hbridge inverter. The operation of proposed strategy is validated through simulation and experimental studies.

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Active Capacitors With Ripple Cancellation Control for AC-DC Converter Applications

Yang

Chen

et al. 2021

IEEE Access

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Based on the derived mathematical equations, a novel Ripple Cancellation Control (RCC) method for the active capacitor is proposed. The proposed RCC method is simple and can be easily realized by using analog circuits. Also, it can be applied to active capacitors implemented by different circuit topologies. Besides, a new approach for developing the mathematical model of the active capacitors implemented by different circuit topologies are also proposed. The energy storage capability and the impedance analysis by using the developed mathematical model are presented to verify the performance of the active capacitors with the proposed RCC method. Computer simulations and the hardware results are presented to validate the accuracy of the mathematical model as well as the performance of the proposed RCC method.

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Variable structure control for active power decoupling topologies

Cited by 3 publications

References 0 publications

Buck-Plus-Unfolder as the Superior Active Power Decoupling Solution for 400 Vdc/kW-Level Applications

Buck-Plus-Unfolder as the Superior Active Power Decoupling Solution for 400 Vdc/kW-Level Applications

Switching strategy for improving the lifetime of dc‐link capacitor in a fault‐tolerant active power decoupling topology

Active Capacitors With Ripple Cancellation Control for AC-DC Converter Applications

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