Concept of a distributed photovoltaic multilevel inverter with cascaded double H-bridge topology

Goetz, Stefan M.; Wang, Yuanfa; Li, Zhongxi; Murphy, David L. K.; Peterchev, Angel V.

doi:10.1016/j.ijepes.2019.03.054

Cited by 55 publications

(12 citation statements)

References 27 publications

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“…Since both v ci and L 1 are always positive, as it is demonstrated in (12), the proposed SMC fulfills the transversality condition.…”

Section: Transversality Conditionmentioning

confidence: 61%

“…The first ones usually adopt step-up converters to match the low-voltage provided by the PV modules with the high-voltage required by commercial grid-connected inverters [5][6][7][8][9][10]. Instead, the second systems have more diverse requirements; for example, PV systems interacting with stand-alone AC loads usually adopt step-up converters [5,[11][12][13], but PV systems designed for battery charging or to interacting with DC loads often use step-down converters [14,15]. Figure 1 depicts some of those types of PV systems: Type I uses a step-up dc/dc converter to perform the maximum power point tracking (MPPT) control on the PV source, which ensures the extraction of the maximum power from the PV string.…”

Section: Introductionmentioning

confidence: 99%

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Sliding-mode controller for a photovoltaic system based on a Cuk converter

Ramos‐Paja

González-Motoya

Villegas-Ceballos

et al. 2021

IJECE

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The wide range of step-up and step-down input-output voltage characteristic of the Cuk converter makes it a good candidate to interface photovoltaic arrays in both classical and distributed maximum power point tracking systems. Because its two inductor structure, Cuk converters have continuous input and output currents, which reduce the additional filtering elements usually required for interfacing dc/dc converter topologies. However, PV systems based on Cuk converters usually do not provide formal proofs of global stability under realistic conditions, which makes impossible to ensure a safe operation of the PV installation. Therefore, this paper proposes a high performance sliding-mode controller for PV systems based on Cuk converters, which regulates the PV voltage in agreement with the commands imposed by a MPPT algorithm, rejecting both load and environmental perturbations, and ensuring global stability for real operation conditions. Finally, the performance of the regulated PV system is tested using both simulations and experiments.

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“…Since both v ci and L 1 are always positive, as it is demonstrated in (12), the proposed SMC fulfills the transversality condition.…”

Section: Transversality Conditionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Sliding-mode controller for a photovoltaic system based on a Cuk converter

Ramos‐Paja

González-Motoya

Villegas-Ceballos

et al. 2021

IJECE

View full text Add to dashboard Cite

show abstract

“…The authors use the method as a "... superior solution for PV system grid integration due to its simple implementation, signal stage power conversion, no added complexity with increasing the number of connected modules, and it eliminates the need for individual control loop for each module..." It is important to mention that most conventional techniques do not achieve a distributed MPPT, which decreases the efficiency of the system. Goetz et al in [104] propose a modular Double Cascading H-bridge (CHB 2 ) topology.…”

Section: Cascaded Based Topologiesmentioning

confidence: 99%

Transformerless Multilevel Voltage-Source Inverter Topology Comparative Study for PV Systems

2020

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At present, renewable energies represent 25% of the global power generation capacity. The increase in clean energy facilities is mainly due to the high levels of pollution generated by the burning of fossil fuels to satisfy the growing electricity demand. The global capacity of generating electricity from solar energy has experienced a significant increase, reaching 505 GW in 2018. Today, multilevel inverters are used in PV systems to convert direct current into alternating current. However, the use of multilevel inverters in renewable energies applications presents different challenges; for example, grid-connected systems use a transformer to avoid the presence of leakage currents. The grid-connected systems must meet at least two international standards analyzed in this work: VDE 0126-1-1 and VDE-AR-N 4105, which establish a maximum leakage current of 300 mA and harmonic distortion maximum of 5%. Previously, DC/AC converters have been studied in different industrial applications. The state-of-the-art presented in the work is due to the growing need for a greater use of clean energy and the use of inverters as an interface between these technologies and the grid. Also, the paper presents a comparative analysis of the main multilevel inverter voltage-source topologies used in transformerless PV systems. In each scheme, the advantages and disadvantages are presented, as well as the main challenges. In addition, current trends in grid-connected systems using these schemes are discussed. Finally, a comparative table based on input voltage, switching frequency, output levels, control strategy used, efficiency, and leakage current is shown.

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“…Different solutions have been proposed in the literature in order to integrate a storage system in PV CHB converters. In [26], a modular cascaded double H-bridge (CHB 2 ) topology with battery directly connected to dc-link is used, thus enabling continuous power output by compensating solar power fluctuations, while the CHB 2 can balance the batteries' load and state of charge. In [21,22], the battery takes place of a PV module in one or more power cells in a single-stage CHB configuration designed to coordinate power allocation among PV, BESS, and the utility grid.…”

Section: Introductionmentioning

confidence: 99%

PV Module-Level CHB Inverter with Integrated Battery Energy Storage System

et al. 2019

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In this paper, a photovoltaic (PV) module-level Cascaded HBridge (CHB) inverter with an integrated Battery Energy Storage System (BESS) is proposed. The advantages and drawbacks of the CHB circuit architecture in distributed PV generation systems are highlighted. The main benefits are related to the higher granularity of the PV power control, which mitigates mismatch effects, thus increasing the power harvesting. Nevertheless, heavy unbalanced configurations due to the intermittent nature of PV sources need to be properly addressed. In order to smooth the PV fluctuations, a Battery Energy Storage System is used to provide both an energy buffer and coordination of power supply and demand to obtain a flat profile of the output power. In particular, by exploiting the inherent modularity of the conversion circuit, a distributed storage system is also implemented by splitting the battery into smaller units each of which represents the backup module of a single power cell of the PV CHB. The proposed design and control strategy allows overcoming the operating limits of PV CHB inverter. Simulation results, carried out on a singlephase nineteenlevel PV CHB inverter, evidence the effectiveness of the proposed design and control approach to minimize the adverse impact of deep mismatch conditions, thus enabling continuous power output by compensating PV power fluctuations.

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Concept of a distributed photovoltaic multilevel inverter with cascaded double H-bridge topology

Cited by 55 publications

References 27 publications

Sliding-mode controller for a photovoltaic system based on a Cuk converter

Sliding-mode controller for a photovoltaic system based on a Cuk converter

Transformerless Multilevel Voltage-Source Inverter Topology Comparative Study for PV Systems

PV Module-Level CHB Inverter with Integrated Battery Energy Storage System

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