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Voltage Balancing Control of Neutral - Point Clamped Inverters Using Multi Carrier Pulse Width Modulation for FACTS Applications

Author(s): Dheivanai.R | Thamilarasi.E | Rameshkumar.S

Journal: International Journal of Engineering Trends and Technology
ISSN 2231-5381

Volume: 5;
Issue: 7;
Start page: 352;
Date: 2013;
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Keywords: FACTS | GTO | multilevel | multi carrier PWM | NPC inverter | voltage balance

In this paper, a novel technique used to keep the voltage across the dc split capacitors of neutral point clamped inverter using multi carrier pulse width modulation and also compensate the reactive power.It can reduce the harmonics without any changes in inverter output. Multi carrier pulse width modulation is controlling the neutral point voltage at full modulation index. It require compensation loop becauseit does not deliver the natural voltage balancing. The voltage is balanced under all operating conditions. The main task of controller is to force the current vector in the three phase load. Theeffectiveness of the proposed method is verified by simulationsand experiments.
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