Grid-Connected Forward Microinverter With Primary-Parallel Secondary-Series Transformer

Meneses, David; García, O.; Alou, P.; Oliver, J. A.; Cobos, J.A.

doi:10.1109/tpel.2014.2365760

Cited by 53 publications

(19 citation statements)

References 17 publications

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“…The main drawback of those solutions is the use of several inductors and capacitors, which reduce both power density and efficiency. Other approach consist of using converters with galvanic isolation [14,16,[23][24][25][26][27][28], where the main concerns are the voltage and current stress on the power devices and soft switching capability, but for a well-designed isolated converter, high efficiency and voltage-conversion-ratio are achievable with low stress on the switching devices [29].…”

Section: Introductionmentioning

confidence: 99%

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

et al. 2020

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In this paper, a design method for a photovoltaic system based on a dual active bridge converter and a photovoltaic module is proposed. The method is supported by analytical results and theoretical predictions, which are confirmed with circuital simulations. The analytical development, the theoretical predictions, and the validation through circuital simulations, are the main contributions of the paper. The dual active bridge converter is selected due to its high efficiency, high input and output voltages range, and high voltage-conversion ratio, which enables the interface of low-voltage photovoltaic modules with a high-voltage dc bus, such as the input of a micro-inverter. To propose the design method, the circuital analysis of the dual active bridge converter is performed to describe the general waveforms derived from the circuit behavior. Then, the analysis of the dual active bridge converter, interacting with a photovoltaic module driven by a maximum power point tracking algorithm, is used to establish the mathematical expressions for the leakage inductor current, the photovoltaic current, and the range of operation for the phase shift. The design method also provides analytical equations for both the high-frequency transformer equivalent leakage inductor and the photovoltaic side capacitor. The design method is validated through detailed circuital simulations of the whole photovoltaic system, which confirm that the maximum power of the photovoltaic module can be extracted with a correct design of the dual active bridge converter. Also, the theoretical restrictions of the photovoltaic system, such as the photovoltaic voltage and power ripples, are fulfilled with errors lower than 2% with respect to the circuital simulations. Finally, the simulation results also demonstrate that the maximum power point for different environmental conditions is reached, optimizing the phase shift factor with a maximum power point tracking algorithm.

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Section: Introductionmentioning

confidence: 99%

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

et al. 2020

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“…Surprisingly, MPPT application of a forward converter has not been studied much. There are a few studies about forward converter-based micro-inverter [5][6][7][8][9]. A multiphase primary-parallel secondary series forward-based microinverter has been proposed for AC module applications.…”

Section: Introductionmentioning

confidence: 99%

“…A multiphase primary-parallel secondary series forward-based microinverter has been proposed for AC module applications. In this study, hardware-based improvement has been studied [5]. Single-stage grid-connected forward converterbased micro-inverter has been presented in [6].…”

Section: Introductionmentioning

confidence: 99%

“…Basic form of a forward converter with PV moduleAt the secondary side of the transformer, voltage seen in diode D 3 is negative since diode D 3 is reverse biased[14]. When the switch is on, voltage of primary and secondary winding, current variation of magnetizing inductor, Lm, current variation of the output inductor and relationship between input voltage and output voltage are calculated as given in Eqs (1)(2)(3)(4)(5)…”

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confidence: 99%

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Forward converter-based distributed global maximum power point tracking in partial shading conditions

Başoğlu

2020

SN Appl. Sci.

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Maximum power point tracking (MPPT) is an essential part of a photovoltaic (PV) power generation systems to obtain the possible biggest efficiency. In partial shading conditions (PSCs), distributed MPPT strategy is used to eliminate mismatching cases between PV modules and load. In this study, forward converter-based distributed MPPT approach is presented for small power module-level and submodule-level MPPT applications. First, operation principles of a forward converter are explained for an MPPT application. Then, performance of a forward converter is evaluated by perturb and observe (P&O) algorithm for module-level and submodule-level MPPT systems in MATLAB/Simulink. Simulation results show that in module-level MPPT technique, forward converter cannot track global maximum power point (MPP) in some PSCs. On the other hand, submodule-level MPPT guarantees global MPPT (GMPPT). Average tracking efficiencies are calculated as 71.24% and 95.34% for module-level and submodule-level MPPT, respectively. That is, submodule-level MPPT outperforms module-level MPPT. On the other hand, submodule-level MPPT is more expensive solution since hardware requirements are very high compared with the module-level MPPT strategy.

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“…To overcome this drawback presented by the boost and buck-boost topologies, the high step-up voltage gain is accomplished by means of a number of non-isolated high step-up DC/DC converters that employ a sort of modification that minimizes the CSR effect over the converter characteristics by means of the reduction of the MOSFET RMS current or duty-cycle. The former approach is achieved introducing interleaved PWM cells to share the converter current (non-isolated [7]- [8], and isolated [9]- [10]), meanwhile the latter is accomplished by a plenty of different ways, such as introducing switched inductors [11]- [12], switched capacitors (passively [11], [13]- [14] and actively [15]), cascaded [16]- [17] or stacked PWM cells [18][19], magnetic coupling of transformers [20]- [22], or a combination of two or more techniques [23]- [26].…”

Section: Introductionmentioning

confidence: 99%

Coupled-inductor High Step-up Integrated Topologies: Synthesis, Analysis and Experimental Results

Andrade¹,

Dreher²,

Schuch³

et al. 2016

Eletrônica de Potência

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This paper presents a new integration concept to generate high voltage step-up non-isolated DC/DC converters with the aid of coupled-inductors. The integration concept relies on the separation of the converter circuit into two or three parts named input, middle and output sections. Hence, any basic converter can partially or fully share one of its sections with another basic converter since both circuits comply with the integration rules. The merged converters become an integrated topology with fewer components. According to this paper, for the input section parallel integration, the circuits remaining output sections can be associated in three different ways, in a series, parallel or cascaded connection. These output sections associations allow for a merged topology to enhance their voltage gain that becomes the sum of the voltage gains of the former topologies alone. An example of integration of the boost and flyback converter is provided to illustrate the theory. The resulting integrated topologies are theoretically and experimentally evaluated. The results prove that the integration methodology is an effective way to obtain high voltage conversion ratio circuits and that the derived topologies are highly efficient due to their low converter series resistances.

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Grid-Connected Forward Microinverter With Primary-Parallel Secondary-Series Transformer

Cited by 53 publications

References 17 publications

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

Forward converter-based distributed global maximum power point tracking in partial shading conditions

Coupled-inductor High Step-up Integrated Topologies: Synthesis, Analysis and Experimental Results

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