Design of single-phase seven-level inverter with reduced number of switching devices for PV applications

Feloups, Cathrine E. S.; Ali, Ahmed; Mohamed, Essam E. M.

doi:10.1109/mepcon.2017.8301274

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…When V Ref > V Car1 and V Car2 and lower than V Car3 , it represents the operational mode (2), as depicted in Figure 3c. Along the same vein, when V Ref > V Car1 and V Car2 and lower than V Car3 , that describes mode (6), as shown in Figure 3k. Finally, when V Ref is higher than V Car3 , the switch Q f is turned-ON to deliver the total input DC-voltage to the H-bridge circuit to synthesize the third output-voltage level, as described in modes (1) depending on the H-bridge inverter switching, as portrayed in Figure 3a,b, respectively.…”

Section: The Switching Patterns and Control Strategymentioning

confidence: 67%

“…Moreover, the renewable energy trend relies on electrical energy production from commercial and residential buildings using PV systems that help to enhance the power system resilience. Given the flexibility associated with PV systems, they are an ideal source of electricity for remote areas, which are located far away from local utility-grids [2,6]. Hence, energy can be produced by installing PV panels on household rooftops for direct consumption, where the excess energy can be stored or sold to the grid if the system is grid-connected.…”

Section: Introductionmentioning

confidence: 99%

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Seven-Level Inverter with Reduced Switches for PV System Supporting Home-Grid and EV Charger

2021

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This paper proposes a simple single-phase new pulse-width modulated seven-level inverter architecture for photovoltaic (PV) systems supporting home-grid with electric vehicle (EV) charging port. The proposed inverter includes a reduced number of power components and passive elements size, while showing less output-voltage total harmonic distortion (THD), and unity power factor operation. In addition, the proposed inverter requires simple control and switching strategies compared to recently published topologies. A comparative study was performed to compare the proposed inverter structure with the recent inverter topologies based on the number of components in the inverter circuit, number of components per output-voltage level, average number of active switches, THD, and operating efficiency as effective parameters for inverter performance evaluation. For design and validation purposes, numerical and analytical models for a grid-tied solar PV system driven by the proposed seven-level inverter were developed in MATLAB/Simulink environment. The inverter performance was evaluated considering grid-integration and stand-alone home with level-2 AC EV charger (3–6 kW). Compared with recently published topologies, the proposed inverter utilizes a reduced number of power components (7 switches) for seven-level terminal voltage synthesis. An experimental prototype for proposed inverter with the associated controller was built and tested for a stand-alone and grid-integrated system. Due to the lower number of ON-switches, the inverter operating efficiency was enhanced to 92.86% with load current THD of 3.43% that follows the IEEE standards for DER applications.

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Section: The Switching Patterns and Control Strategymentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Seven-Level Inverter with Reduced Switches for PV System Supporting Home-Grid and EV Charger

2021

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“…Additionally, they suffer from common-mode leakage current in many applications [9,10]. In addition, they may require transformers for high voltage-gain applications [11,12], which in turn increases the inverter cost, losses, and footprint. On the other hand, transformer-based inverters utilizing a line-frequency transformer for galvanic isolation reduces system efficiency and increases its footprint and cost.…”

Section: Introductionmentioning

confidence: 99%

Three-Phase PWM Inverter for Isolated Grid-Connected Renewable Energy Applications

2021

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This paper proposes a three-phase isolated flyback inverter (IFBI) for single-stage grid-tied solar PV applications, considering a simple sinusoidal pulse-width modulation (SPWM) scheme. The proposed single-stage inverter employs a reduced passive elements count by considering three input-parallel output-differential (IPOD) flyback converter modules. Additionally, a single small size LC-input low-pass filter is utilized at the input paralleling point for ripple-free input current operation, which is essential in grid-connected renewable energy applications. In addition, a mathematical model of the IFBI is presented to confirm the existence of its low-order harmonic components. A simple PI controller-based control scheme, considering only two loops and five sensors, is used to control the proposed grid-tied IFBI. Continuous modulation scheme (CMS) combined with SPWM is used to diminish the low-frequency harmonic components. Moreover, a simple selective harmonic elimination (SHE) loop is used for second-order harmonic components (SOHC) elimination from grid-injected currents. The SHE has decreased the SOHC from 43% to 0.96%, which improves the grid current THD from 39% to 3.65%, to follow the IEEE harmonic standard limits. Additionally, the harmonic elimination technique decreases the circulating power between the inverter paralleled modules, which enhances the grid currents power factor. The proposed inverter is verified through a grid-connected 200 V, 1.6 kW, 60 Hz experimental prototype, and the switching frequency is 50 kHz. TMS-based DSP controller is used to control the grid-injected power to follow the reference power set-point.

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“…Therefore, minimizing the switches number and control difficulty is an essential issue for practical operation 25 . Many modified families of MLIs, considering a lower number of switching devices, have been recently proposed 5,19,20,26‐40 . In Ref.…”

Section: Introductionmentioning

confidence: 99%

A single‐phase modular multilevel inverter based on controlled DC‐cells under two SPWM techniques for renewable energy applications

Ali

Sayed

Takeshita

et al. 2020

Int Trans Electr Energ Syst

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Design of single-phase seven-level inverter with reduced number of switching devices for PV applications

Cited by 7 publications

References 15 publications

Seven-Level Inverter with Reduced Switches for PV System Supporting Home-Grid and EV Charger

Seven-Level Inverter with Reduced Switches for PV System Supporting Home-Grid and EV Charger

Three-Phase PWM Inverter for Isolated Grid-Connected Renewable Energy Applications

A single‐phase modular multilevel inverter based on controlled DC‐cells under two SPWM techniques for renewable energy applications

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