High efficiency wide load range buck/boost/bridge photovoltaic microconverter

Hester, R.K.; Thornton, Christopher; Dhople, Sairaj V.; Zhao, Zheng; Sridhar, N.; Freeman, Dave

doi:10.1109/apec.2011.5744613

Cited by 54 publications

(22 citation statements)

References 3 publications

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“…As a MPPT string converter, a Four Switch BuckBoost (FSBB) converter was used, and as discussed in many papers, it consists of a simple bidirectional bridge suitable for battery chargers in PV systems, and it can operate as a Buck or Boost depending on the requirements [13] - [16]. In Figure 7, a more complete scheme of the simulations is illustrated, in which the FSBB is the string converter of a PV array with mismatch deviated by the CCSCD.…”

Section: Simulation Resultsmentioning

confidence: 99%

Cascaded Cell String Current Diverter For Improvement Of Photovoltaic Solar Array Under Partial Shading Problems

Santos¹,

Donoso-Garcia²,

Seleme³

et al. 2015

Eletrônica de Potência

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-Partial shading has shown to be a common efficiency issue for photovoltaic arrays installations, whether for islanded or grid-tied systems. Current diverter appears as reasonable solution, but with the increasing of string order, the currents deviated difficult the sizing of inductors. Also, in this type of converter, a multilevel synchronized gate-driver is needed. In this work, an independently cell string current diverter is proposed. This configuration is based in the NonDissipative String Current Diverter, however, its inductors current achieve low values during partial shading, and does not need synchronism of its gatedrivers. Also, this configuration facilitates one local Maximum Power Point Tracking for each module, and enables the enhancement of efficiency with simple implementation. The simulation and experimental results are presented to give support to the theoretical development.1

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Section: Simulation Resultsmentioning

confidence: 99%

Cascaded Cell String Current Diverter For Improvement Of Photovoltaic Solar Array Under Partial Shading Problems

Santos¹,

Donoso-Garcia²,

Seleme³

et al. 2015

Eletrônica de Potência

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“…Recently, the bridge based buck/boost topology, depicted in Fig. 6, became popular due to the high efficiency it exhibits over a wide range of voltage gains, its buck and boost (and pass-through) capability, and its lowcost [5,7,11]. This power stage utilizes four switches: N1 -N4, and can operate in either one of three modes: buck, A third mode, the pass-through mode, is selected when the output and input voltages are close to one another, so the MIC's required gain is close to unity.…”

Section: Front End DC Optimizersmentioning

confidence: 99%

“…Thus, while the inner feedback loop can be implemented either digitally or by a simple analogue circuitry, the outer loop realizes an iterative search of the MPP, which relies on a microcontroller implemented MPPT algorithm [7,11]. In this scheme, the converters' dynamics are decoupled from the tracking of maximum power.…”

Section: Optimizers Controlmentioning

confidence: 99%

“…The abrupt transition from one operation mode to another (buck / pass-through / boost) is challenging and has been the focus of a few recent works [11,[28][29][30]. With conventional PWM controllers, the transition to and from the pass-through mode can provoke high voltage transients and increased ripple because it is associated with an abrupt change of the effective switching frequency, which is constant in the buck or the boost modes and zero in the passthrough-mode.…”

Section: Optimizers Controlmentioning

confidence: 99%

“…The optimization of the bridge based buck/boost topology for efficiency and control of an individual MIC were detailed in [10,11]. Due to the extreme gain that MICs might be required to provide in highly mismatched situations, the performance degrades even with the MIC-based DMPPT architecture.…”

Section: Introductionmentioning

confidence: 99%

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Distributed Maximum Power Point Tracking in Photovoltaic Systems—Emerging Architectures and Control Methods

Shmilovitz

Levron

2012

Automatika

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Original scientific paperThe interest in distributed maximum power point tracking increases along with increasing deployment of photovoltaic generators and the constant pressure to reduce the cost of photovoltaic generated energy. Distributed maximum point tracking facilitates a significant boost of captured photovoltaic power.In this paper we compare different distributed maximum power point architectures, and categorize them into two main groups; those which process the entire generated power and partial power processing based architectures. The first ones are found to be easier to control while the second ones exhibit higher efficiency. Some delicate control issues are emphasized; a distinction is made between maximum power point tracking and negative feedback control. For systems consisting of multiple power processors, we derive the required number of maximum point tracking units and their adequate location within a global architecture. Only the right number of units guarantees extraction of the entire potential power as well as system stability. In contrary, we demonstrate how instability occurs due to a redundant control structure. Distribuirano praćenje točke maksimalne snage u fotonaponskim sustavima -nove arhitekture i metode upravljanja. Interes za distribuirano praćenje točke maksimalne snage se povećava zajedno sa rastućim razvojem fotonaponskih sustava i konstantnim pritiskom da se smanji cijena energije iz fotonaponskih sustava. Distribuirano praćenje točke maksimalne snage omogućava značajan porast dobivene fotonaponske snage.U ovomčlanku usporedene su različite arhitekture distribuirane točke maksimalne snage, te su kategorizirane u dvije glavne skupine; one koje procesirajučitavu generiranu snagu i one temeljene na parcijalnom procesiranju snage. Pokazuje se da je prva skupina jednostavnija za upravljanje, dok je druga skupina efikasnija. Naglasak je stavljena na odredena osjetljiva pitanja vezana za upravljanje; razlučuje se praćenje točke maksimalne snage i negativna povratna veza. Za sustave koji se sastoje od više procesora snage, izveden je potreban broj jedinica za praćenje maksimalne točke, te njihova adekvatna lokacija u globalnoj arhitekturi. Samo ispravan broj jedinica osigurava dobivanječitave potencijalne snage kao i stabilnost sustava. S druge strane, pokazano je kako uslijed redundantne upravljačke strukture dolazi do nestabilnosti.Ključne riječi: praćenje točke maksimalne snage (MPPT), pretvarač integriran na modulu (MIC), DC optimizator, distribuirano praćenje točke maksimalne snage (DMPPT)

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A review of maximum power point tracking techniques for use in partially shaded conditions

Liu

Chen

Huang

2015

Renewable and Sustainable Energy Reviews

161

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High efficiency wide load range buck/boost/bridge photovoltaic microconverter

Cited by 54 publications

References 3 publications

Cascaded Cell String Current Diverter For Improvement Of Photovoltaic Solar Array Under Partial Shading Problems

Cascaded Cell String Current Diverter For Improvement Of Photovoltaic Solar Array Under Partial Shading Problems

Distributed Maximum Power Point Tracking in Photovoltaic Systems—Emerging Architectures and Control Methods

A review of maximum power point tracking techniques for use in partially shaded conditions

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