Grid-connected PV system using a three-phase modified dual-stage inverter

Casaro, Marcio Mendes; Martins, Denizar Cruz

doi:10.1109/cobep.2009.5347762

Cited by 10 publications

(10 citation statements)

References 12 publications

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“…ese variables should not vary. at de�ciency can be neglected thanks to the Behavior Matching [44,45,51,52,74].…”

Section: Dc-dc Stagementioning

confidence: 99%

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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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“…ese variables should not vary. at de�ciency can be neglected thanks to the Behavior Matching [44,45,51,52,74].…”

Section: Dc-dc Stagementioning

confidence: 99%

“…In this paper, a conceptual modi�cation is proposed that is called ��e� Dual-Stage Inverter [51,52]. In this new approach, there is no control in the DC-DC stage, the SRC3 operates with constant frequency and duty-cycle, representing a very high efficiency operation.…”

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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“…The traditional dual-stage inverter implements some control strategy in the DC-DC stage. In this paper a conceptual modification is proposed that is called Modified Dual-Stage Inverter [18,19]. In this new approach there is no control in the DC-DC stage, the SRC3 operates with constant frequency and duty-cycle, representing a very high efficiency operation.…”

Section: Introductionmentioning

confidence: 99%

Modified Dual-stage Inverter Applied in a Three-phase Grid-connected Pv System Using Behavior Matching Technique

Casaro¹,

Schmitz²,

Knaesel³

et al. 2013

Eletrônica de Potência

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This paper presents a grid-connected PV system in a centralized configuration and constructed through a three-phase dual-stage inverter. In this topology, usually, a DC-DC converter performs the maximum power point tracking (MPPT) and an inverter is responsible for controlling the grid-current. For the DC-DC stage the three-phase series resonant converter (SRC3) is chosen thanks to the advantages that it exhibits. However, it is inadequate for the accomplishment of MPPT, due to its efficiency strongly dependent on the implemented deadtime and switching frequency. Then, this paper proposes a conceptual modification, i.e., a modified 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 configuration 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. The maximum power operating point (MPOP) is found by maximizing the direct axis current, obtained by Park's transformation from the inverter, through the perturbation and observation algorithm (P&O). Any specific measurement to realize MPPT is not needed. The galvanic isolation is achieved by using a high-frequency transformer. The structure is appropriate for high power applications, above 10 kW.

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“…This increasing energy consumption causes serious environmental problems such as global warming and acid rain. To resolve both energy and environmental problems, photovoltaic (PV) solar energy has become a significant and attractive candidate for green power generation in distribution networks [4][5][6][7]. However, due to PV's low energy density, to achieve the same megawatt power level as typical power plants do, the Very Large Scale PV (VLS-PV) power plants usually require hundreds acres of land and hundreds of thousands of PV modules [8].…”

Section: Introductionmentioning

confidence: 99%

Circuit topology study for distributed MPPT in very large scale PV power plants

Ahmadi¹,

Mansouri²,

Wang³

2011

2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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In very large scale photovoltaic power plants (VLS-PV), due to partial shading and PV modules mismatching, a single point MPPT is not be efficient for all PV modules. Therefore, distributed maximum power point tracking (DMPPT) can be utilized to increase output power capability by increasing the number of converter/inverter units. In this paper, a simple circuit is introduced to achieve DMPPT. Then, the limitations of DC bus voltage, total output power, duty ratio of the different converter choices are discussed. Simulation results also show that the proposed strategy can be utilized to realize seamless transition between soft start mode and steady state operation.

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Grid-connected PV system using a three-phase modified dual-stage inverter

Cited by 10 publications

References 12 publications

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

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

Modified Dual-stage Inverter Applied in a Three-phase Grid-connected Pv System Using Behavior Matching Technique

Circuit topology study for distributed MPPT in very large scale PV power plants

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