Comparative analysis of multilevel inverter topologies for photovoltaic system

Desai, Ekta; Shah, Nilesh

doi:10.1109/nuicone.2013.6780149

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…The most popular are the Neutral Point Clamped (NPC), the flying capacitor (FC) [15], and the Cascaded H-Bridged (CHB) converter [16]. The NPC converter has a better reliability as compared to the FC topology since it requires less electrolytic capacitors.…”

Section: Three-level Voltage Source Converter Modelingmentioning

confidence: 99%

Design and control of a grid-tied three-phase three-level diode clamped single-stage photovoltaic converter

Lahouar

Hamouda

Slama

2015

2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)

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This paper introduces a single-stage gridconnected photovoltaic power conversion system based on a three-phase three-level Neutral Point Clamped (NPC) converter. The main benefits of the proposed structure are the elimination of the intermediate DC/DC power conversion stage that is usually used to boost the dcvoltage and ensure MPPT operation. Therefore, two control schemes based on a current controller and an MPPT algorithm are handled in only one processing stage. The MPPT algorithm computes in real-time the dc voltage that should be applied across the PV generator so as to extract the maximum power. The output of the MPPT algorithm is thereafter considered as a reference of a current controller that should perform a perfect tracking of the dc-voltage reference and also near unity input power factor operation. The proposed photovoltaic power conversion topology and control method are tested by numerical simulations. The obtained results demonstrate that the designed PV conversion system provides effective response in steady state, fast and perfect tracking of the maximum power point, and robust in case of a partial shading.

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Section: Three-level Voltage Source Converter Modelingmentioning

confidence: 99%

Design and control of a grid-tied three-phase three-level diode clamped single-stage photovoltaic converter

Lahouar

Hamouda

Slama

2015

2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)

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“…Voltage-fed Pulse-Width Modulated converters are key in many applications such as integration of renewable sources into the grid and motor drives [1][2][3]. They consist of switches arranged in a topology in order to synthesise output voltages according to a reference that usually comes from controller algorithms [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A multi‐criteria methodology with algebraic validation for the design of space vector switching sequences over a fundamental period horizon

Zucuni

Schuetz

Carnielutti

et al. 2023

IET Electric Power Appl

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This paper presents a novel methodology for the design of the Space Vector (SV) switching sequences in order to reduce the output voltage distortion and the common‐mode voltage (CMV) without increasing the number of commutations in comparison to conventional and optimised techniques presented in the literature. Three spaces can be distinguished in a converter, referring to: line‐to‐line voltages, phase voltages and switching states. Consequently, three correspondent sequences of vectors in each space can be verified. The output voltage distortion, CMV and switching count are mainly affected, respectively, by the sequences in the line‐to‐line voltage, phase voltage and switching state spaces. However, the three spaces are interdependent, and the selection of a sequence in one space affects the ones in the other spaces. As a consequence, this paper presents a novel SV approach, where the line‐to‐line voltage sequences are selected over a fundamental period horizon considering the impact in the phase voltages through an algebraic analysis, assuring minimal phase voltage transitions while using VIKOR method to choose the best trade‐off between reduction of output voltage distortion and CMV. In order to validate the proposed strategy, experimental results are given to a three‐phase five‐level Packed U‐Cell (PUC5) converter.

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“…This technique employs only a single dc voltage source. But it uses two low frequency transformers and thus makes the system bulky and costly [3]. In case of CHB with single voltage source, capacitor acts as a DC power source.…”

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confidence: 99%

A Single Source Five Level Inverter with Reduced Number of Switches

Venugopal¹,

Mathew²

2015

IJAREEIE

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ABSTRACT:A single phase five level inverter with a dual reference single carrier Pulse Width Modulated (PWM) control scheme is presented. The inverter is capable of producing five levels of output voltage levels (Vdc, Vdc/2, 0, −Vdc/2, −Vdc) from the dc supply voltage. For this, the proposed multilevel inverter needs a single dc voltage source with a series connection of two capacitors, a bidirectional switch formed with four diodes and a switch, and an Hbridge cell. The proposed approach helps in reducing the number of independent dc voltage sources and number of switches as compared with conventional circuits KEYWORDS:Multilevel Inverter (MLI), Pulse Width Modulation, Total Harmonic Distortion (THD). I.INTRODUCTIONMultilevel inverter technology has emerged recently as a very important alternative in the area of high-power mediumvoltage applications. Researches are going on to improve their capabilities further through optimized control techniques, and to minimize both component count and manufacturing cost. The multilevel inverter has been implemented in various applications, such as motor drives, power conditioning devices, renewable energy generation and distribution. PWM inverters can simultaneously control output voltage, frequency and it can reduce the amount of harmonics in output current which results in better THD content.Several multilevel topologies have been developed, but as the output voltage levels increases, it also increases the number of switches, number of independent dc sources, switching stresses, losses, voltage unbalancing across capacitors etc. Half and Full bridge inverters requires large input and output filters, lower voltage operating capability, harmonic distortion is high, high Electro Magnetic Interference (EMI) [1]. The mainly used MLI topologies are flying capacitor, diode clamped and H-bridge converter with separate DC sources. Diode clamped MLI requires large number of diodes as no: of level increases. Flying capacitor MLI uses a large no: of capacitors to hold voltages. Cascaded H bridge MLI requires least no: of components but needs separate dc voltage sources for each H bridges [2]. Among conventional multilevel inverters, cascaded H-bridge multilevel inverter (CHB) is one of the best approaches to increase the number of output voltage levels. As CHB increases H-bridge cells, it also increases the number of switches and also independent dc input voltage sources. One of the solutions to reduce the number of components in CHB is to use asymmetrical dc voltage sources. But the main disadvantage of asymmetric cascaded H-bridge inverter is the requirement of asymmetric DC sources for its operation. Using H Bridge with Multiple Transformer reduces the number of switches and provides proper isolation. It also uses a combination of asymmetrical voltage sources to synthesize multilevel output voltages. This technique employs only a single dc voltage source. But it uses two low frequency transformers and thus makes the system bulky and costly [3]. In case of CHB with single voltage s...

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Comparative analysis of multilevel inverter topologies for photovoltaic system

Cited by 4 publications

References 6 publications

Design and control of a grid-tied three-phase three-level diode clamped single-stage photovoltaic converter

Design and control of a grid-tied three-phase three-level diode clamped single-stage photovoltaic converter

A multi‐criteria methodology with algebraic validation for the design of space vector switching sequences over a fundamental period horizon

A Single Source Five Level Inverter with Reduced Number of Switches

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