Analysis and Design of High-Efficiency Hybrid High Step-Up DC–DC Converter for Distributed PV Generation Systems

Andrade, António Manuel Santos Spencer; Schuch, Luciano; Martins, Mário

doi:10.1109/tie.2018.2840496

Cited by 128 publications

(107 citation statements)

References 21 publications

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“…The capacitor charge balance establishes that in steady-state operation, the net change of charge over one switching period must be zero, hence the average capacitor current in steady-state must be zero [52]. Applying the charge balance to C L in the DAB converter, i.e., when the average value is equal to zero i CL = 0, enables the obtaining of the average values of (3) as reported in (6). Such an expression shows that the PV current depends on the inductor leakage current.…”

Section: Analysis Of the Pv Module And Dab Connectionmentioning

confidence: 99%

“…Hence, multiple PV modules are connected in different series and parallel configurations to meet the load requirements [3,4]. Also, different power converters topologies are used to adapt the PV voltage to the load requirement; those converters must exhibit high efficiency and, in some cases, high voltage-conversion ratio to feed the loads [5,6]. For example, standalone applications designed for pumping and lighting systems, installed far from the generating point, need to rise the supply voltages to reduce transmission losses [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, considering that many PV applications require converters with high voltage-conversion ratio to supply the load requirements, different converter topologies have been proposed in the literature. The boost converter is the most widely adopted for PV applications, but efficiency is drastically reduced for high voltage-conversion ratios [6,16,20]. The cascade connection of converters with low voltage-conversion ratios is also proposed, but this solution also affects the energy conversion efficiency [19].…”

Section: Introductionmentioning

confidence: 99%

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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: Analysis Of the Pv Module And Dab Connectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…where I SW(rms) is the rms current of the MOSFET from (30), and R ds(ON) is the ON state resistance of the MOSFET provided by the manufacturer's datasheet. Reverse recovery loss of the diodes in the proposed converter is negligible; thus, mainly conduction loss occurs in the diodes (D 1 , D 2 , D 3 , D 4 , D 5 , and D s ), which can be calculated as follows 33 :…”

Section: Power Loss Estimationmentioning

confidence: 99%

“…[24][25][26][27][28][29][30][31][32] Apart from the aforementioned benefits, SC converters are able to provide only discrete and fixed voltage gain, which restricts their application. In Andrade et al, 33 a hybrid DC-DC converter is proposed to get variable and fractional high voltage gain, but it uses coupled inductors and the switch operates under hard switching. Therefore, the efficiency is compromised due to the coupling factor and the switching losses.…”

Section: Introductionmentioning

confidence: 99%

A wide load range ZVS high voltage gain hybrid DC‐DC boost converter based on diode‐capacitor voltage multiplier circuit

Priyadarshi

Kar

Karanki

2019

Int Trans Electr Energ Syst

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Summary In this paper, a single‐switch hybrid high voltage gain boost converter topology employing zero‐voltage switching (ZVS) feature is proposed. The proposed converter can achieve high voltage gain with soft switching operation over a wide range of load. The topology is a combination of the Cockcroft‐Walton diode‐capacitor voltage multiplier and a conventional boost converter, which results in a hybrid DC‐DC converter. The diode‐capacitor ladder enables the converter to achieve high voltage gain without a transformer or coupled inductor. Because of its transformerless design, single switch with lower duty cycle requirement, and ZVS feature, the efficiency of the converter is improved significantly. Moreover, due to the input inductor, it is able to provide lower input current ripple and variable fractional voltage gain, which is a key requirement for maximum power point tracking (MPPT) in photovoltaic application. A 480‐W hardware prototype with 48‐V input voltage and 450‐V output voltage is developed, and experimental results are presented to validate the efficacy of the proposed converter. The total achievable efficiency is above 95.4%, in the full load range (80‐480 W).

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A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

Eskandarian

Harchegani

Kazemi

2020

Int Trans Electr Energ Syst

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Summary Recently, with the development of electric vehicles (EVs), in order to compensate for the undesirable effects of charging stations on grid characteristics, paying attention to the local generators based on renewable energy has increased and has caused to develop of the peripheral systems. In this paper, a high step‐up multistage structure consisting of several integrated boost flyback converter (IBFC) has been proposed. In the combination of these stages, the boost subconverters are interleaved in order to charge the battery bank and are in series with the flyback subconverters in order to supply the variable loads. The proposed structure has advantages, such as applicability in high voltage step‐up cases, enhanced reliability in photovoltaic system, and flexibility against variable power consumption. In addition, this structure at the no‐load condition has the ability to charge the battery system with proper voltage and supply several vehicles simultaneously without any voltage drop. Furthermore, the energy stored in leakage inductor can be recycled instead of damping with passive snubbers, resulting in high conversion efficiency and simple circuit structure with fewer components. The performance of proposed structure is analyzed in detail at no‐load, loading, and input power outage conditions. Then, the proposed converter with solar panel input power in order to supply the EV charging system is simulated in Matlab/Simulink to verify the analytical results. Finally, a three‐stage prototype (17.3–240 V) with 60 W solar panel input has been developed, which validates the feasibility and the effectiveness of the proposed topology using variable loads (180, 360, 720 W).

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Analysis and Design of High-Efficiency Hybrid High Step-Up DC–DC Converter for Distributed PV Generation Systems

Cited by 128 publications

References 21 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

A wide load range ZVS high voltage gain hybrid DC‐DC boost converter based on diode‐capacitor voltage multiplier circuit

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

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