A cascaded inverter for transformerless single-phase grid-connected photovoltaic systems

Calais, Martina; Agelidis, Vassilios G.; Dymond, M.S.

doi:10.1016/s0960-1481(00)00069-0

Cited by 62 publications

(19 citation statements)

References 6 publications

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“…Because the proposed inverter is used in a grid-connected PV system, utility grid is used instead of load. The dc-dc boost converter is used to step up inverter output voltage V inv to be more than √ 2 of grid voltage V g to ensure power flow from the PV arrays into the grid [19]. A filtering inductance L f is used to filter the current injected into the grid.…”

Section: Five-level Inverter Topology and Pwm Lawmentioning

confidence: 99%

Multilevel Inverter For Grid-Connected PV System Employing Digital PI Controller

Selvaraj

Rahim

2009

IEEE Trans. Ind. Electron.

526

182

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This paper presents a single-phase five-level photovoltaic (PV) inverter topology for grid-connected PV systems with a novel pulsewidth-modulated (PWM) control scheme. Two reference signals identical to each other with an offset equivalent to the amplitude of the triangular carrier signal were used to generate PWM signals for the switches. A digital proportional-integral current control algorithm is implemented in DSP TMS320F2812 to keep the current injected into the grid sinusoidal and to have high dynamic performance with rapidly changing atmospheric conditions. The inverter offers much less total harmonic distortion and can operate at near-unity power factor. The proposed system is verified through simulation and is implemented in a prototype, and the experimental results are compared with that with the conventional single-phase three-level grid-connected PWM inverter.Index Terms-DSP TMS320F2812, grid connected, photovoltaic (PV), proportional-integral (PI) current control, pulsewidthmodulated (PWM) inverter.

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Section: Five-level Inverter Topology and Pwm Lawmentioning

confidence: 99%

Multilevel Inverter For Grid-Connected PV System Employing Digital PI Controller

Selvaraj

Rahim

2009

IEEE Trans. Ind. Electron.

526

182

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“…In addition, dc sources can be added or subtracted, which can increase the number of output levels. Although the original cascaded topology requires several isolated dc sources, in some systems, they may be available through batteries or PV panels; thus, it has been used to implement high-efficiency transformerless inverters [30], [32]. Currently, there are commercial inverters (for SARES applications) in the market that are based on this topology [28], [29].…”

Section: Cascade H-bridgementioning

confidence: 99%

Multilevel Inverter Topologies for Stand-Alone PV Systems

Daher

Schmid

Antunes

2008

IEEE Trans. Ind. Electron.

548

172

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This paper shows that versatile stand-alone photovoltaic (PV) systems still demand on at least one battery inverter with improved characteristics of robustness and efficiency, which can be achieved using multilevel topologies. A compilation of the most common topologies of multilevel converters is presented, and it shows which ones are best suitable to implement inverters for stand-alone applications in the range of a few kilowatts. As an example, a prototype of 3 kVA was implemented, and peak efficiency of 96.0% was achieved.Index Terms-Multilevel inverter, renewable energy (RE), stand-alone photovoltaic (PV) system.

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“…Recently, transformerless operation, i.e. eliminating the low frequency power transformer from the grid-tied PV inverter, is followed in order to improve the PCS efficiency and reduce its cost and volume [1]- [5]. Even though the gained merits from the transformerless operation, it results in several problems, where the dc current component injection into the grid is a major one.…”

Section: Introductionmentioning

confidence: 99%

Coupled-Inductor-Based DC Current Measurement Technique for Transformerless Grid-Tied Inverters

Abdelhakim

Mattavelli

Yang

et al. 2018

IEEE Trans. Power Electron.

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Grid-tied photovoltaic (PV) inverters must fulfill several requirements, including high efficiency and reduced cost and complexity of the overall system. Hence, transformerless operation is advantageous in order to achieve the prior requirements. Meanwhile, such operation results in several demerits, like the dc current component injection into the grid. This component should be effectively mitigated in order to avoid some impacts, like the saturation of the transformers in the distribution network. On the other hand, limiting this component up to few milliamperes is seen to be a challenging issue due to the various measurement errors.Accordingly, different blocking and measurement techniques have been proposed and studied to overcome this issue, where some demerits are seen behind each technique like the implementation complexity, the common mode voltage problems, and the high filter requirements. Moreover, none of them measures the dc component directly, but predicts its value using different approaches.Hence, this letter proposes a new technique to measure this dc current component with high accuracy using a coupled-inductor combined with a small range hall effect current sensor in order to achieve the lowest possible cost with the highest possible accuracy. The proposed technique is introduced, analyzed, and tested experimentally to verify its principle of operation. Also experimental measurement of the dc current component using a 5 kVA transformerless grid-tied voltage source inverter (VSI) is introduced with and without the proposed technique in order to validate its operation.

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A cascaded inverter for transformerless single-phase grid-connected photovoltaic systems

Cited by 62 publications

References 6 publications

Multilevel Inverter For Grid-Connected PV System Employing Digital PI Controller

Multilevel Inverter For Grid-Connected PV System Employing Digital PI Controller

Multilevel Inverter Topologies for Stand-Alone PV Systems

Coupled-Inductor-Based DC Current Measurement Technique for Transformerless Grid-Tied Inverters

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