Five-level inverter with dual reference modulation technique for grid-connected PV system

This paper presents a single-phase five-level grid-connected PV inverter with a novel dual reference modulation technique. Two reference signals identical to each other with an offset equivalent to the amplitude of the triangular carrier signal were used to generate PWM signals. The inverter consist...

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Bibliographic Details
Published in:Renewable energy 2010-03, Vol.35 (3), p.712-720
Main Authors: Rahim, N.A., Selvaraj, J., Krismadinata, C.
Format: Article
Language:English
Subjects:
Applied sciences
Computer simulation
DC–DC converter
Digital signal processing
Diodes
DSP TMS320F2812
Electric potential
Electrical engineering. Electrical power engineering
Exact sciences and technology
Grid-connected
Inverters
Modulation
Photovoltaic (PV)
PI current control
Power electronics, power supplies
Pulse duration modulation
PWM inverter
Renewable energy
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Summary:This paper presents a single-phase five-level grid-connected PV inverter with a novel dual reference modulation technique. Two reference signals identical to each other with an offset equivalent to the amplitude of the triangular carrier signal were used to generate PWM signals. The inverter consists of a full-bridge inverter and an auxiliary circuit comprising four diodes and a switch. The inverter produces output voltage in five levels: zero, +1/2 V dc , V dc , −1/2 V dc and − V dc . A digital PI current control algorithm is implemented in DSP TMS320F2812 to keep the current injected into the grid sinusoidal and to have high dynamic performance with low THD. The validity of the proposed inverter is verified through simulation and implemented in a prototype. The experimental results are compared with conventional single-phase three-level grid-connected PWM inverter in terms of THD.
ISSN:0960-1481
1879-0682
DOI:10.1016/j.renene.2009.08.021