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Research Papers

Investigation on a Modified 11-Level Cascaded Inverter Fed by Photovoltaic Array for Standalone Applications

[+] Author and Article Information
R. Sridhar, S. S. Dash, Kiran Vemula

Department of EEE,
SRM University,
Chennai 603203, India

S. Jeevananthan

Department of EEE,
Pondicherry Engineering College,
Pondicherry 605014, India

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received January 23, 2014; final manuscript received August 1, 2014; published online September 10, 2014. Assoc. Editor: Santiago Silvestre.

J. Sol. Energy Eng 137(2), 021002 (Sep 10, 2014) (7 pages) Paper No: SOL-14-1026; doi: 10.1115/1.4028397 History: Received January 23, 2014; Revised August 01, 2014

This paper suggests a modified 11-level reduced switch inverter fed by photovoltaic (PV) array feeding standalone AC loads. Multilevel inverters (MLIs) have great influence in distributed power system due to their high power capability with reduced harmonic content. Among the various topologies of MLI, cascaded MLIs are widely adopted for PV applications since batteries charged by PV panels can serve as DC voltage sources for MLI. The PV system charges the batteries through a buck converter, controlled by a smart perturb and observe (P&O) maximum power point tracking (MPPT) technique. The perturb and observe MPPT described in this work is capable of not only extracting maximum power from the panel but also regulate the charging mechanism of the battery. This work also aims at enhancing the performance of existing reduced switch topology, which is having higher harmonic and switching complexity by adopting a structural change. This topology uses less number of controlled switches compared to the existing method which aids in reducing losses and switching complexity. In addition to that, with a reduced switch count, it can be configured and realized easily. The proposed work is successfully realized in Matlab/Simulink and hardware environment. The simulation and hardware results prove that proposed work is highly viable.

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Figures

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Fig. 1

Equivalent circuit of PV cell

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Fig. 2

Complete system overview

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Fig. 3

Battery charging through buck converter

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Fig. 5

Schematic diagram of buck converter fed battery

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Fig. 6

(a) Modified cascaded inverter with reduced controlled switches, (b) unipolar 11-level output, and (c) bipolar 11-level output

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Fig. 7

(a) Mode of operation when S1 is ON and (b) mode of operation when S1 and S2 are ON

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Fig. 8

Pulse generation using multicarrier PWM technique

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Fig. 9

Bipolar inverter output voltage with R load

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Fig. 10

Inverter output with R–L load

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Fig. 11

THD of the proposed topology

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Fig. 12

Comparative graph for the proposed topology

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Fig. 13

Step change in irradiation and MPPT Power output

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