Comparative analysis of DC to AC conversion cells for application in PV‐linked grid‐connected modular multi‐level cascaded converters

Malekjamshidi, Zahra; Jafari, Mohammad

doi:10.1049/iet-pel.2019.0833

Cited by 5 publications

(7 citation statements)

References 37 publications

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“…Therefore, the sum of the three circulating currents can be non-zero and will flow through the DC-side capacitor. Applying the Fortescue transform to (13), the phasors of the positive-, negative-, and zero-sequences of the AC circulating current references are given by It is worth noting that, according to (14), the DPME control strategy assumes that, regardless of the irradiance conditions, the three AC circulating currents must be 60 • or 120 • apart from each other, according to the direction of the arm active power mismatches. As a result, the phasors of the negative-and zero-components result in the complex conjugate of the other, i.e., I ac * circ,− = I ac * circ,0 and ϕ + = 0.…”

Section: Dpme Control Strategymentioning

confidence: 99%

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A Sizing Procedure for the DC-Side Capacitor of a Three-Phase Modular Multilevel Converter

Barcellona,

Barresi,

Piegari

2023

Energies

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The integration of photovoltaic (PV) modules with a modular multilevel converter (MMC) is very interesting because it allows us to exploit the intrinsic advantages of that converter, such as modularity and high voltage quality, and to implement distributed maximum power point tracking algorithms. The latter can appropriately be performed through controlling the circulating currents. In the literature, some control strategies for both the AC and DC circulating currents were proposed to manage the power mismatch among the legs and between the arms of the MMC. In a previous work, the authors proposed a novel control strategy for the circulating current components and inserted a capacitor on the DC side of a three-phase MMC with integrated PV panels. In the present work, it is shown how the correct sizing of this capacitor is essential to optimize the AC circulating voltages and minimize converter losses. A sizing procedure is proposed, deeply analyzed, and validated through numerical simulations.

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Section: Dpme Control Strategymentioning

confidence: 99%

“…In the case of medium-and highvoltage systems, the need for galvanic isolation arises. This can be ensured using internal DC-DC converters based on high-frequency transformers, such as flyback and dual active bridge converters, connected to each submodule (SM) of the MMC [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Sizing Procedure for the DC-Side Capacitor of a Three-Phase Modular Multilevel Converter

Barcellona,

Barresi,

Piegari

2023

Energies

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“…These topologies employ internal high-frequency transformers (HFTs) into their submodules (SMs) to increasing the reliability and security of the PV system [16]. These topologies aim for achieving a full MPPT control, ensuring galvanic isolation, generating low THD, and reducing the total size and weight [17]. Several three-phase modular inverters (TPMIs) have been proposed in the literature as candidates for LSPV systems [18].…”

Section: Introductionmentioning

confidence: 99%

Dual Isolated Multilevel Modular Inverter with Novel Switching and Voltage Stress Suppression

Alotaibi

Darwish

2022

Energies

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This paper presents an improved structure for the submodules (SMs) in the three-phase modular inverter (TPMI) based on a dual isolated SEPIC/CUK (DISC) converter for large-scale photovoltaic (LSPV) plants. The DISC SMs can offer several advantages, including increased efficiency, reduced passive elements, and galvanic isolation via compact-size high-frequency transformers. The SMs can also provide a wide range for the output voltage and draw continuous currents with low ripples from the input source. However, the high dv/dt value across the switches during hard switching can cause current oscillations and voltage spikes, which will impair the operation of complementary switches and affect the safety of the power devices. For this challenge, the DISC SM is improved by replacing the output switches with diodes and adding a bypassing switch. In comparison to the conventional DISC SM, the improved DISC SM reduces the switch’s voltage spikes; hence, it can increase the overall efficiency. Thus, the DISC SM’s will be able to suppress voltage spikes in the TPMI inverter and therefore the total reliability will be improved. The work will detail the analysis of the proposed system along with design guidelines. Additionally, the simulation and experimental results to validate the operation of proposed DISC SM are presented using MATLAB/SIMULINK as well as a scaled-down experimental prototype.

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“…In this case, the MWT operates as a common magnetic bus to integrate the energies in the form of magnetic flux [13][14][15][16]. The power flow in the MWT is controlled by a phase shift control technique [11][12][13][14][15][16]. The most common topologies of the MAB converter are triple-active bridge (TAB) [14] and quadruple-active bridge (QAB) [16].…”

Section: Introductionmentioning

confidence: 99%

“…The resultant topology leads to a reduced number of conversion cells and transformers which leads to a further reduction of the size and cost of the system, while still preserving the same advantages [12]. In this case, the MWT operates as a common magnetic bus to integrate the energies in the form of magnetic flux [13][14][15][16]. The power flow in the MWT is controlled by a phase shift control technique [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Design and development of a cascaded modular multi‐level converter based on current‐fed quadruple‐active bridge converters for grid integration of photovoltaic systems

Malekjamshidi

Jafari

2021

IET Energy Syst Integration

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This article proposes a new topology of a cascaded modular multi‐level converter (MMC) based on the current‐fed quadruple active bridge (CFQAB) converters for grid integration of photovoltaic (PV) systems. The MMC topology includes multiple cascaded converter modules in each phase of a three‐phase system. Each individual module is further formed by a PV‐linked CFQAB dc–dc converter to integrate the PV outputs and supply it to a high‐voltage dc (HVDC) bus and further to a cascaded inverter to converter to the ac voltage for the distribution grid. The proposed topology features a wide input voltage range, lower current ripple and smaller size due to the use of CFQAB converter as the building block, which makes it an ideal choice for PV applications. The operation principle of the MMC, converter modules and the control techniques have been presented in detail. A scaled‐down prototype of the topology is implemented to validate the operation of the proposed topology and the control systems.

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Comparative analysis of DC to AC conversion cells for application in PV‐linked grid‐connected modular multi‐level cascaded converters

Cited by 5 publications

References 37 publications

A Sizing Procedure for the DC-Side Capacitor of a Three-Phase Modular Multilevel Converter

A Sizing Procedure for the DC-Side Capacitor of a Three-Phase Modular Multilevel Converter

Dual Isolated Multilevel Modular Inverter with Novel Switching and Voltage Stress Suppression

Design and development of a cascaded modular multi‐level converter based on current‐fed quadruple‐active bridge converters for grid integration of photovoltaic systems

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