Current balancing of cascaded H-bridge converters for PV systems with partial shading

Iannuzzi, Diego; Pagano, Mario; Piegari, Luigi; Tricoli, Pietro

doi:10.1108/compel-11-2014-0324

Cited by 8 publications

(1 citation statement)

References 16 publications

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“…Bosun [31] have described the integration of both cascaded multilevel inverter and two level h-bridge inverter so as to achieve the low losses of two level h-bridge inverter and low grid connected current THD advantages of cascaded multilevel inverter. Diego [32] have proposed a new converter topology for integrating pv plants constituted by many panels into the grid and the output voltage presents a very low ripple. Coppola [33] have proposed a new control which is able to efficiently track the maximum power point while assuring good performance in terms of harmonic distortion and power factor in both standard and mismatch conditions.…”

Section: Introductionmentioning

confidence: 99%

Cascaded H-Bridge Five Level Inverter for Grid Connected PV System using PID Controller

Sivagamasundari¹,

Mary²

2016

JSTS:Journal of Semiconductor Technology and Science

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Abstract-Photovoltaic energy conversion becomes main focus of many researches due to its promising potential as source for future electricity and has many advantages than the other alternative energy sources like wind, solar, ocean, biomass, geothermal etc. In Photovoltaic power generation multilevel inverters play a vital role in power conversion. The three different topologies, diode-clamped (neutral-point clamped)inverter, capacitor-clamped (flying capacitor) inverter and cascaded h-bridge multilevel inverter are widely used in these multilevel inverters. Among the three topologies, cascaded h-bridge multilevel inverter is more suitable for photovoltaic applications since each pv array can act as a separate dc source for each h-bridge module. This paper presents a single phase Cascaded H-bridge five level inverter for grid-connected photovoltaic application using sinusoidal pulse width modulation technique. This inverter output voltage waveform reduces the harmonics in the generated current and the filtering effort at the input. The control strategy allows the independent control of each dc-link voltages and tracks the maximum power point of PV strings. This topology can inject to the grid sinusoidal input currents with unity power factor and achieves low harmonic distortion. A PID control algorithm is implemented in Arm Processor LPC2148. The validity of the proposed inverter is verified through simulation and is implemented in a single phase 100W prototype. The results of hardware are compared with simulation results. The proposed system offers improved performance over conventional three level inverter in terms of THD.Index Terms-Multilevel inverter, cascaded H-bridge multilevel inverter, total harmonic distortion, sinusoidal pulse width modulation, MATLAB, PID controller

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Section: Introductionmentioning

confidence: 99%

Cascaded H-Bridge Five Level Inverter for Grid Connected PV System using PID Controller

Sivagamasundari¹,

Mary²

2016

JSTS:Journal of Semiconductor Technology and Science

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Analytical study and simulation of a transformer-less photovoltaic grid-connected inverter with a delta-type tri-direction clamping cell for leakage current elimination

Jalilzadeh

Hagh

Sabahi

2018

COMPEL

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PurposeThis paper aims to propose a new transformer-less inverter structure to reduce the common-mode leakage current in grid-connected photovoltaic (PV) systems. Design/methodology/approachThe proposed circuit structure is the same as the conventional full-bridge inverter with three additional power switches in a triangular structure. These three power switches are between the bridge and the output filter, and they mitigate the common-mode leakage current flowing toward the PV panels’ capacitors. The common-mode leakage current mitigation is done through the three-direction clamping cell (TDCC) concept. By clamping the common-mode voltage to the middle voltage of the DC-link capacitors, the leakage current and the total harmonic distortion (THD) of the injected current to the grid is effectively reduced. Therefore, the efficiency is improved. FindingsThe switching modes and the control method are introduced. A comparison is carried out between the proposed structure and other solutions in the literature. The proposed topology and its respective control method are simulated by PSCAD/EMTDC software. The simulation results validate the advantages of the presented structure such as clamping the common-mode voltage and reducing leakage current and THD of injected current to the grid. Originality/valuePresenting a single phase-improved inverter structure with low-leakage current for grid-connected PV power systems represents a significant original contribution to this work. The proposed structure can inject a sinusoidal current with low THD to the AC grid, and the power factor is unity on the AC side. In the half positive cycle, one of the switches in the TDCC is turned off under zero current. Besides, one of the other switches in TDCC is turned on with zero voltage and, therefore, its turn-on switching losses are zero. The efficiency of the proposed topology is high because of the reduction of leakage current and power losses. Accordingly, the presented topology can be a good solution to the leakage current elimination.

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Maximum Power per Ampere Modulation for Cascaded H-Bridge Converters

Spina

Rogers

Brando

et al. 2023

IEEE J. Emerg. Sel. Topics Power Electron.

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Current balancing of cascaded H-bridge converters for PV systems with partial shading

Cited by 8 publications

References 16 publications

Cascaded H-Bridge Five Level Inverter for Grid Connected PV System using PID Controller

Cascaded H-Bridge Five Level Inverter for Grid Connected PV System using PID Controller

Analytical study and simulation of a transformer-less photovoltaic grid-connected inverter with a delta-type tri-direction clamping cell for leakage current elimination

Maximum Power per Ampere Modulation for Cascaded H-Bridge Converters

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