Faculty Publications

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Author: search.filters.author.Udaya Kumar, R.Y.

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    A novel fifteen level inverter for photovoltaic power supply system
    (2004) Beig, A.R.; Udaya Kumar, R.Y.; Ranganathan, V.T.
    A novel dc to ac inverter for photovoltaic power supply system is presented in this paper. The objective is to develop a low cost, reliable and efficient photovoltaic power supply unit for domestic applications. A fifteen level cascaded H-Bridge configuration using low voltage MOSFETs as switching devices is used. This configuration results in sinusoidal output voltages with step modulation and fundamental frequency switching. The proposed configuration has reduced conduction loss and switching loss. Simple gate drive circuit is designed using commonly available integrated circuit components. The simulation results are presented.
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    A novel technique for control of Cascaded multilevel inverter for photovoltaic power supplies
    (IEEE Computer Society, 2005) Naik, R.L.; Udaya Kumar, R.Y.
    Multilevel voltage source inverters offer several advantages compared to their conventional counterparts. By synthesizing the AC output terminal voltage from several levels of voltages, staircase wave forms can produced, which approach the sinusoidal wave form with low harmonic distortion, thus reducing filter requirements. The need of several sources on the DC side of the converter makes multilevel technology attractive for photovoltaic applications. The basic modulation techniques enable harmonic elimination by predetermination of the switching angles. This is determined according to a previously calculated and stored pulse width modulated waveform. It has the advantage of operating at fundamental frequency switching. However, this technique is seriously limited as the number of levels increases because of the increased complexity and the reduced accuracy of the non-linear solutions. This paper proposes a novel Multilevel PWM technique (phase-shifted sinusoidal PWM) to over come all these limitations while maintaining switching at fundamental frequency, found better THD. Simulation results are presented in the paper.
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    A novel technique for photovoltaic maximum power pointtracking system
    (2005) Shantharama Rai, C.; Udaya Kumar, R.Y.; Naik, R.L.
    Maximum power point tracking (MPPT),used in photovoltaic(PV) systems to maximize the photovoltaic array output power, irrespective of the temperature and irradiation conditions and of the load characteristics. In this paper a new MPPT system has been proposed consists of newly developed flyback type converter of a flyback transformer for high frequency linkage and synchronous switches for the connection to the AC utility grid and a maximum power point tracking (MPPT) controller without a current sensor. In this project the generated power of the PV array can be calculated by the equation using the voltage of PV array. The proposed PV power system which consists of two or more inverters, can get large power than the conventional one, when the PV array is partially shaded by some constructions.