Study and optimization of two dc-dc power structures used in a grid-connected photovoltaic system

Souza, Kleber C. A. De; Gonçalves, Odinei Hess; Martins, Denizar Cruz

doi:10.1109/pesc.2006.1712265

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…The dc-dc converter power structure employed to boost the PV voltage and for tracking the maximum power point of the PV modules to fully utilize the PV power was the HalfBridge Zero Voltage Switching Pulse Width Modulation (DC-DC HB ZVS-PWM) asymmetrically driven converter [20]. Due to high voltage stresses on rectifier diodes [20], we chose to use two bridge rectifiers in series.…”

Section: Design Procedures Of the Dc-dc Convertermentioning

confidence: 99%

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Optimization Of The Ferrite Core Volume In A Single-phase Grid-connected Pv System With Active And Reactive Power Control

Souza¹,

Santos²,

Martins³

2013

Eletrônica de Potência

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This paper presents a method to minimize the losses and the magnetic cores volume in a singlephase active power filter based in a two stages gridconnected PV system. The proposed circuit injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is very high independently of the solar radiation and the type of the load connected. In sunny days, the system processes all the reactive and active load power and the excessive power from the PV module can be fed to the utility. On the other hand, on cloudy days for instance, if the PV power is not enough, the system processes all the reactive load power and the shortage of active load power is supplemented by the utility. Besides, just using one current sensor, the control strategy is simple and of suitable for practical implementation.

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Section: Design Procedures Of the Dc-dc Convertermentioning

confidence: 99%

“…Due to high voltage stresses on rectifier diodes [20], we chose to use two bridge rectifiers in series. Thus, it was necessary to use a transformer with double secondary winding.…”

Section: Design Procedures Of the Dc-dc Convertermentioning

confidence: 99%

Optimization Of The Ferrite Core Volume In A Single-phase Grid-connected Pv System With Active And Reactive Power Control

Souza¹,

Santos²,

Martins³

2013

Eletrônica de Potência

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show abstract

“…The dc-dc converter power structure employed to boost the PV voltage and for tracking the maximum power point of the PV modules to fully utilize the PV power was the Half-Bridge Zero Voltage Switching Pulse Width Modulation (DC-DC HB ZVS-PWM) asymmetrically driven converter [12] shown in Fig. 3.…”

Section: Design Procedures Of the Dc-dc Convertermentioning

confidence: 99%

“…In order to obtain same average currents supplied by the system source (photovoltaic panel), during the operation stages DTs and (1-D)Ts, it should be chosen an appropriate relationship between the capacitors Ce 1 e Ce 2 in the DC-DC HB ZVS-PWM. The right value of the capacitor can be determined by the following equations [12].…”

Section: Design Procedures Of the Dc-dc Convertermentioning

confidence: 99%

Active and reactive power control for a single-phase grid-connected PV system with optimization of the ferrite core volume

Souza

Santos

Martins

2010

2010 9th IEEE/IAS International Conference on Industry Applications - INDUSCON 2010

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This paper presents a method to minimize the losses and the magnetic cores volume in a single-phase active power filter based in a two stages grid-connected PV system. The proposed circuit injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is very high independently of the solar radiation and the type of the load connected. In sunny days, the system processes all the reactive and active load power and the excessive power from the PV module can be fed to the utility. On the other hand, on cloudy days for instance, if the PV power is not enough, the system processes all the reactive load power and the shortage of active load power is supplemented by the utility. Besides, just using one current sensor, the control strategy is simple and of suitable for practical implementation.Keywords-Single-phase circuits, grid-connected PV systems and active power filter.

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“…is implies the need for a DC-DC converter in the structure of the PV power system. e isolated ZVS Full-Bridge DC-DC converter [31][32][33][34][35][36][37][38] is usually used at power levels above 750 W [24], to performer both the MPPT and the galvanic isolation. Commonly, its efficiency ranges from 92% to 93% under a 45% to 100% load condition [39].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Three-Phase Grid-Connected PV Power System Using a Modified Dual-Stage Inverter

Martins

2013

ISRN Renewable Energy

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is paper presents a grid-connected PV system in a centralized con�guration constructed through a three-phase dual-stage inverter. For the DC-DC stage the three-phase series resonant converter is chosen thanks to the advantages that it exhibits. However, it is inadequate for the accomplishment of MPPT, due to its efficiency strongly depending on the implemented deadtime and switching frequency. en, this paper proposes a conceptual modi�cation, that is, a modi�ed dual-stage inverter in which the inverter stage is responsible for both the MPPT and the grid-current control. In addition, the DC-DC converter operates with constant duty cycle and frequency. Such con�guration requires a new concept, introduced as Behavior Matching. It serves as a fundamental feature for the DC-DC converter to reproduce the PV array I-V characteristic when they are connected, without control action. e maximum power operating point is found by maximizing the direct axis current, obtained by Park's transformation from the inverter, through the perturbation and observation algorithm. Any speci�c measurement to realize the MPPT is needed. e galvanic isolation is achieved by using a high-frequency transformer. e structure is appropriate for high power applications, above 10 kW.

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Study and optimization of two dc-dc power structures used in a grid-connected photovoltaic system

Cited by 8 publications

References 5 publications

Optimization Of The Ferrite Core Volume In A Single-phase Grid-connected Pv System With Active And Reactive Power Control

Optimization Of The Ferrite Core Volume In A Single-phase Grid-connected Pv System With Active And Reactive Power Control

Active and reactive power control for a single-phase grid-connected PV system with optimization of the ferrite core volume

Analysis of a Three-Phase Grid-Connected PV Power System Using a Modified Dual-Stage Inverter

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