Research Papers

Single-Phase Cascaded Grid Connected Multilevel Inverter for Interfacing Renewable Energy Sources With Microgrid

[+] Author and Article Information
I. Gerald Christoper Raj

Assistant Professor
Department of EEE,
PSNA College of Engineering and Technology,
Dindigul, Tamil Nadu 624622, India
e-mail: gerald.gera@gmail.com

M. Kaliamoorthy

Department of EEE,
Karpagam College of Engineering,
Coimbatore, Tamil Nadu 641032, India
e-mail: kaliasgoldmedal@gmail.com

V. Rajasekaran

PSNA College of Engineering and Technology,
Dindigul, Tamil Nadu 624622, India

R. M. Sekar

Assistant Professor
Department of EEE,
PSNA College of Engineering and Technology,
Dindigul, Tamil Nadu 624622, India

1Corresponding authors.

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 July 2, 2014; final manuscript received June 13, 2015; published online July 7, 2015. Editor: Robert F. Boehm.

J. Sol. Energy Eng 137(5), 051004 (Jul 07, 2015) (10 pages) Paper No: SOL-14-1193; doi: 10.1115/1.4030886 History: Received July 02, 2014

In this paper, a novel single-phase cascaded grid connected multilevel inverter (MLI) is proposed for feeding power to microgrid from renewable energy sources (RESs). The proposed inverter is capable of feeding power to microgrid with low total harmonic distortion (THD). The proposed inverter consists of two H bridge inverters connected in cascade, namely, upper and lower inverters. The upper inverter is fed from photovoltaic (PV) array through a DC–DC boost converter, whereas the lower inverter is fed from wind turbine (WT) coupled to permanent magnet synchronous generator (PMSG) through an uncontrolled rectifier and DC–DC boost converter. The upper inverter operates at high frequency, whereas the lower inverter operates at fundamental frequency. To extract maximum power from the WT and PV array, a sliding mode control based maximum power point tracker (MPPT) is used. The proposed inverter is connected to the single phase 230 V, 50 Hz grid, and the control algorithm is implemented in the SPARTAN 3A digital signal processor (DSP) board. The proposed inverter is simulated using matlab/simulink, and detailed experimental results are presented to show the efficacy of the proposed inverter under different environmental conditions.

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Fig. 1

Proposed single phase 11-level inverter fed from PV module and WT

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Fig. 2

Operating modes of the lower inverter

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Fig. 3

Modulation strategy of the proposed inverter

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Fig. 4

Reference waveform generation for an 11-level inverter (upper bridge)

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Fig. 5

(a) VI characteristics of PV module under different irradiance and the optimal switching surface (green), S (v, i) = 0, (b) VI characteristics of PV module under different irradiance and cell temperatures (50 °C and 25 °C) with optimal switching surface, S (v, i) = 0, and (c) WT speed versus power characteristics for various wind speeds and the optimum switching surface (red) Swt(p, n) = 0

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Fig. 6

Performance of sliding mode control based MPPT for sudden variations in environmental conditions: (a) PV module and (b) WT

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Fig. 7

Proposed control system for cascaded MLI

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Fig. 10

Inverter output voltage with modulation index of 0.95: (a) simulation and (b) experiment

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Fig. 11

Total, upper, and lower inverter voltage along with load current of the proposed CHBMLI: (a) simulation and (b) experiment

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Fig. 12

Dynamic response of inverter voltage for sudden change in grid voltage: (a) simulation and (b) experiment

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Fig. 13

Dynamic response of current supplied by the inverter to grid for sudden change in solar irradiance: (a) simulation and (b) experiment

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Fig. 14

Power injected into the grid for irradiance of 1000 W/m2 and 10 m/s of wind speed



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