A Multilevel DC to Three-Phase AC Architecture for Photovoltaic Power Plants

Achanta, Prasanta K.; Johnson, Brian; Seo, Gab-Su; Maksimović, Dragan

doi:10.1109/tec.2018.2877151

Cited by 39 publications

(14 citation statements)

References 23 publications

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“…In comparison to three single-phase conversion units, the threephase conversion unit reduces the number of semiconductors of the dc/ac conversion stage, as only one full-bridge is used for the three phases. In [24], another three-phase conversion unit is presented, in which the dc/ac conversion stage, the isolation stage and the ac/dc conversion stage operate together as a quadruple active bridge. With this alternative the switching losses are reduced, increasing the efficiency of the conversion unit.…”

Section: State Of the Art Of Medium-voltage Conversion Systems For Photovoltaic Plantsmentioning

confidence: 99%

“…In comparison to the three-phase conversion units of MV-CHB conversion systems presented in [23], [24], the MV-CSQT also has a reduced number of conversion stages, as it uses an ac/ac conversion stage to directly transform the medium-frequency ac voltage into the grid-frequency ac voltage. The topology presented in [7], [25] is the only threephase topology proposed to date with an ac/ac conversion stage.…”

Section: Comparison With the State-of-the-art Cascaded Conversion Systemsmentioning

confidence: 99%

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Medium-Voltage Cascaded Sequential Topology for Large-Scale PV Plants

Lumbreras¹,

Barrios

Balda

et al. 2021

IEEE Access

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Section: State Of the Art Of Medium-voltage Conversion Systems For Photovoltaic Plantsmentioning

confidence: 99%

Section: Comparison With the State-of-the-art Cascaded Conversion Systemsmentioning

confidence: 99%

Medium-Voltage Cascaded Sequential Topology for Large-Scale PV Plants

Lumbreras¹,

Barrios

Balda

et al. 2021

IEEE Access

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“…Before delving into the details of the proposed solution, we will first delineate related prior art. The most straightforward approaches utilize either a centralized controller to dispatch supervisory control commands [1]- [5] or distributed controllers with some sort of low-bandwidth communications for information exchanges [6]- [12] (e.g., grid voltage and angle broadcast, inverter stack voltage amplitude, phase information etc.). The key drawback is that these methods necessitate significant wiring, the controller acts as a single point of vulnerability, and implementation on very large numbers of units is impractical even if the required communication is low bandwidth or intermittent.…”

Section: Sourcementioning

confidence: 99%

Decentralized Control of Cascaded H-Bridge Inverters for Medium-Voltage Grid Integration

Dutta

Mallik

et al. 2020

2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)

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This paper introduces a fully decentralized control strategy that allows for individualized active and reactive power control of H-bridge inverters connected in series. After formulating a model of the system power flows, we outline a communications-free approach where each inverter can act on independent commands. Inverter-level feedback is accomplished locally via a measurement of current flowing through the stack.A key feature is the lack of any centralized control routines or phase-locked loop. In this framework, the reactive power control loops achieve voltage synchronization among the converters and the grid, and the active power control loops modulate the terminal voltage amplitudes that influence power delivery. Furthermore, pole placement via state feedback is used to ensure stability of voltage synchronization while also enabling tracking of bidirectional power commands. Simulations are presented to validate the proposed approach.

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“…In this regard, multicell converters have become the most attractive solutions for providing modularity, wide power operation, and a large voltage range [2][3][4]. Of the various multicell topologies, cascaded multilevel converters are the most suitable configurations for large PV power plants [5][6][7][8][9], since they can connect individual power modules to groups of PV panels. However, when several modules are connected in series, galvanic isolation is required to fulfill insulation constraints.…”

Section: Introductionmentioning

confidence: 99%

Quadrature Voltage Compensation in the Isolated Multi-Modular Converter

2021

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Series connections of modules in cascaded multilevel converters are prone to power imbalances due to voltage differences on their DC side. When modules are connected to direct current (DC) sources, such as photovoltaic panels, the capability of withstanding power imbalances is crucial for generating the maximum power. In order to provide a possible solution for this requirement, this paper proposes a control strategy called Quadrature Voltage Compensation, which allows a wide range of power imbalances. The proposed control strategy regulates the power by introducing a circulating current between the arms and a phase angle in the output voltage. The impact of the circulating current and its effect on the phase voltage are studied. To highlight the features of the proposed strategy, an analytical model based on vector superposition is also described, demonstrating the strong capability of tolerating power differences. Finally, to validate the effectiveness of the Quadrature Voltage Compensation, simulation and experimental results are presented for a three-phase isolated multi-modular converter.

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A Multilevel DC to Three-Phase AC Architecture for Photovoltaic Power Plants

Cited by 39 publications

References 23 publications

Medium-Voltage Cascaded Sequential Topology for Large-Scale PV Plants

Medium-Voltage Cascaded Sequential Topology for Large-Scale PV Plants

Decentralized Control of Cascaded H-Bridge Inverters for Medium-Voltage Grid Integration

Quadrature Voltage Compensation in the Isolated Multi-Modular Converter

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