A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link

Barrios, Manuel A.; Cárdenas, Víctor; Sandoval, J.; Guerrero, Josep M.; Vasquez, Juan C.

doi:10.3390/electronics10040409

Cited by 8 publications

(6 citation statements)

References 47 publications

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“…Another category of topologies for the power converter used to connect the PV generators to the grid involves the generation of a multilevel AC voltage. Initially, the so-called classical topologies were adopted, namely the cascaded H-bridge (CHB), neutral point clamped (NPC) and flying capacitor [34][35][36][37][38][39][40] topologies. Of these, the first one is characterized by the distributed use of PV panels, allowing better reliability to be achieved.…”

Section: Introductionmentioning

confidence: 99%

Compensation of Unbalanced Low-Voltage Grids Using a Photovoltaic Generation System with a Dual Four-Leg, Two-Level Inverter

et al. 2022

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In this paper, a grid-connected photovoltaic (PV) generation system is proposed with the purpose of providing support to low-voltage grids, namely through the elimination or attenuation of the grid imbalances. This compensation must consider the load types, which can be either linear or non-linear, and whether the reactive power and current harmonics generated by the non-linear loads need to be compensated in addition to the unbalanced active power. This must be well considered, since the compensation of all aspects requires oversized PV inverters. Thus, the different unbalanced compensation schemes are addressed. Several schemes for the generation of the inverter current references taking into consideration the compensation and load type are presented. For this PV generation system, a dual four-leg, two-level inverter is proposed. It provides full unbalanced compensation owing to the fourth leg of the inverter and also extends the AC voltage, which is important when this compensation is required. To control this inverter, a control scheme for the inverter that considers several compensation factors is proposed. A vector voltage modulator associated with the controller is another aspect that is addressed in the paper. This modulator considers the balance between the DC voltages of the inverters. Several compensation schemes are verified through computational tests. The results validate the effectiveness of the proposed PV generation system.

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Section: Introductionmentioning

confidence: 99%

Compensation of Unbalanced Low-Voltage Grids Using a Photovoltaic Generation System with a Dual Four-Leg, Two-Level Inverter

et al. 2022

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“…Two ways are applied to convert DC-AC conversion. In most of the applications, the intermediate stage is involved for DC-DC conversion and it is followed by DC-AC conversion [2]. But, the problem in the two-stage conversion is the involvement of passive components, dc-link voltage problem, and boosting ability limitations.…”

Section: Introductionmentioning

confidence: 99%

Switched Capacitor Based High Step-Up Multilevel Inverter with Self-Balancing Ability and Low Switching Stress

Mani

Basha

Ramkumar

et al. 2022

International Transactions on Electrical Energy Systems

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In this article, the switched capacitor (SC) based high step-up multilevel inverter is proposed with self-balancing capability. The proposed SC inverter topology is to step up the high output voltage from the very low input voltage without any bulky transformer. This proposed inverter generates single-phase AC voltage with a frequency of 50 Hz from a very low DC input voltage of 50 V with any intermediate DC-DC conversion stage. Hence, the proposed SC inverter is highly suitable for fuel cell, photovoltaic (PV) applications, and shunt active power filter (SAPF). To control the SC inverter, a multicarrier pulse width modulation (PWM) technique is engaged in the inverter. The high step-up voltage level can be achieved by the charging and discharging process of the SC. Furthermore, the stress voltage of the switches does not exceed the applied voltage and the total standing voltage of the inverter is greatly reduced without H-bridges. The comparative analysis of the proposed SC inverter is made for the components, peak inverse voltage (PIV), total standing voltage (TSV), boosting ability, and voltage balancing of capacitors. The main theme of the paper is producing a thirteen-level sinusoidal current with acceptable total harmonic distortion (THD) at different loads, low PIV, TSV, high boosting ability, and self-balancing of capacitors with fewer passive components. The whole system is examined by using MATLAB/Simulink.

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“…This issue is solved via Multiple Maximum Power Point Tracking (MPPT) and Cascaded H-bridge (CHB) algorithms and topology. In this context, the Multilevel Inverter (MLI) plays an important role in converting DC to Alternating Current (AC), with the number of levels, determining the realisation of pure sinusoidal voltage output [3][4].…”

Section: Introductionmentioning

confidence: 99%

A 7-level inverter with less number of switches for grid-tied PV applications

BhanuTej¹,

Naidu²

2021

IJATEE

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In the current context, Medium Voltage High Power (MVHP) applications are developing industrial technologies. The direct connection of a Photovoltaic (PV) system to an MVHP system may cause various connectivity challenges. To address the interconnection difficulties, this paper describes a 7-Level Cascaded H-Bridge Multilevel Inverter (CHB-MLI) architecture with fewer switches and lower harmonics. This article proposes the Reduced Switch Multilevel Inverter (RSMLI). This design is less expensive than traditional Multilevel Inverter (MLI) topologies, and it is ideally suited for medium voltage and high-power applications since it synthesizes numerous Direct Current (DC) sources. The innovative 7-Level inverter is represented with a decreased number of switches using the Phase Opposition Disposition (POD)methodology. The lower switch count helps the construction of simple converter structures. To boost performance, the MATLAB/Simulink results are evaluated.

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A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link

Cited by 8 publications

References 47 publications

Compensation of Unbalanced Low-Voltage Grids Using a Photovoltaic Generation System with a Dual Four-Leg, Two-Level Inverter

Compensation of Unbalanced Low-Voltage Grids Using a Photovoltaic Generation System with a Dual Four-Leg, Two-Level Inverter

Switched Capacitor Based High Step-Up Multilevel Inverter with Self-Balancing Ability and Low Switching Stress

A 7-level inverter with less number of switches for grid-tied PV applications

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