Asymmetric multilevel topology for photovoltaic energy injection to microgrids

Muñoz, Javier; Gaisse, Patricio; Baier, Carlos R.; Rivera, Marco; Gregor, Raúl; Zanchetta, Pericle

doi:10.1109/compel.2016.7556665

Cited by 25 publications

(7 citation statements)

References 18 publications

(16 reference statements)

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“…Moreover, the inclusion of LBC in the VLB MLI exactly doubles the number of levels with the addition of four extra switches. Numbers of switches (N sw ), the number of sources (N dc ) and the number of diodes (N dd ) involved in the VLB MLI in terms of RU (n) are expressed in (1)(2)(3). In this work, the VLB MLI is integrated with the grid through a small size low pass filter (inductor) to reduce further the current harmonics caused by switching action.…”

Section: Proposed System Configurationmentioning

confidence: 99%

Closed-Loop Control and Performance Evaluation of Reduced Part Count Multilevel Inverter Interfacing Grid-Connected PV System

et al. 2020

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Multilevel inverters (MLIs) have drawn tremendous attention in the power sector. Application of MLI has grown extensively to improve the power quality and efficiency of the photovoltaic (PV) system. For an MLI interfacing PV system, the size, cost and voltage stress are the key constraints of the MLI that need to be minimized. This paper presents a novel reduced part count MLI interfacing single-stage grid-tied PV system along with a closed-loop control strategy. The proposed MLI consists of n repeating units and a level boosting circuit (LBC) that assists in generating 4n + 7 voltage levels instead of 2n + 3 levels. Three different algorithms are proposed for a proper selection of dc-link voltages to enhance the levels further. A comparative analysis is carried out to confirm the superiority of the developed MLI. The workability of the proposed MLI is investigated with a 1.3 kW PV system. The closed-loop control strategy ensures the maximum power tracking, dc-link voltage balancing, satisfactory operation of the MLI and injection of clean sinusoidal grid current under any dynamic changes. Comprehensive simulation analysis is carried out considering a 15-level MLI structure. Experimental tests further confirm the practicality of the topological advancement for a PV system under different dynamic conditions. INDEX TERMS Asymmetrical repeating unit, distributed maximum power point tracking, multilevel inverter, photovoltaic (PV) system, reduced components.

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Section: Proposed System Configurationmentioning

confidence: 99%

Closed-Loop Control and Performance Evaluation of Reduced Part Count Multilevel Inverter Interfacing Grid-Connected PV System

et al. 2020

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“…ULTILEVEL inverters (MLIs) have received much attention in varieties of medium-high range of power conversion systems [1]- [3]. This is due to the abilities of the MLI such as significant harmonic reduction, voltage stress reduction, high quality and high-efficiency output [4].…”

Section: Introductionmentioning

confidence: 99%

Extendable Switched-Capacitor Multilevel Inverter With Reduced Number of Components and Self-Balancing Capacitors

Bana

Panda

Padmanaban

et al. 2021

IEEE Trans. on Ind. Applicat.

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Multilevel inverters (MLIs) with self-balanced switched-capacitors (SC) have received wide recognition for increasing the reliability and efficiency of renewable energy and high-frequency power distribution systems. This paper presents a new SC MLI structure using a reduced number of components. The proposed dual-source SC MLI can be extended in various ways to increase the voltage levels at the output. The SCs are selfbalanced by using a suitable charging-discharging pattern and thereby, voltage boosting is achieved. The operational analysis and features of the proposed 25-level MLI are delineated in detail. Comparative analysis with state-of-art MLIs in terms of the number of components, voltage stress, and cost factor demonstrate the merit of the proposed extendable SC MLIs. Extensive simulation of the proposed MLI structure is performed on the MATLAB/Simulink environment using both the low and high switching frequency control schemes. Furthermore, simulation results are validated experimentally by developing a prototype of the proposed MLI under load variations, frequency change condition, and variation in the modulation index.

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“…The modulation techniques for these converters may be of several types. Some developments apply PWM (Pulse Width Modulation), SVM (Space Vector Modulation), M 2 PC (Modulated Model Predictive Control), SHE (Selective Harmonic Elimination), and Staircase Modulation [4,6,9,[12][13][14][15][16][17][18][19][20]. Similarly, there is a wide variety of control strategies that can be applied to multilevel converters.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, there is a wide variety of control strategies that can be applied to multilevel converters. Among them, there are linear strategies, such as PI (Proportional Integrative) and PR (Proportional Resonant) [20,21]. Additionally, nonlinear strategies, such as hysteresis control, predictive control, and fuzzy control, can also be applied [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy

et al. 2020

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This article proposes a 27-level asymmetric cascade H-bridge multilevel topology for photovoltaic applications, which considers a predictive control strategy that allows minimization of the commutations of the converter. This proposal ensures a highly sinusoidal and stable photovoltaic injection when there are solar irradiance disturbances, generating a low distortion in the current waveform and low switching losses. To validate the performance of the control and the proposed topology, the dynamic model of the alternating current (AC) and direct current (DC) side system is first obtained, which is checked by computational simulations. Subsequently, the implementation of a master–slave control is carried out, focused on the control of DC voltage and AC current. The proposal is simulated, and the total harmonic distortion (THD) is obtained in the voltage and current waveforms. Undesired commutations, typical of the predictive control, are eliminated in the AC voltage waveform, and a proper DC voltage tracking is achieved for the high-power cell. In order to demonstrate the performance of the proposed control strategy, a low-power proof-of-concept prototype is implemented, in which the energy is injected to the grid, under the event of solar irradiance disturbances (with DC control).Then, the undesired switching in the main cell is eliminated, generating THDs in the voltage and current signal of 7.76% and 2.65%, respectively.

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Asymmetric multilevel topology for photovoltaic energy injection to microgrids

Cited by 25 publications

References 18 publications

Closed-Loop Control and Performance Evaluation of Reduced Part Count Multilevel Inverter Interfacing Grid-Connected PV System

Closed-Loop Control and Performance Evaluation of Reduced Part Count Multilevel Inverter Interfacing Grid-Connected PV System

Extendable Switched-Capacitor Multilevel Inverter With Reduced Number of Components and Self-Balancing Capacitors

Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy

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