Broad Research area : Power Electronics
The energy demand in the world is steadily increasing and new types of energy sources must be found in order to cover the future demands, since the conventional sources are about to be emptied. These renewable energy sources include solar radiation, wind, biomass, hydro, etc. These sources are available intermittently in cycles and can be harnessed in any number of cycles. The integration of renewable energy sources to the electricity grid becomes an interesting research topic nowadays. Modern power electronic technology is an important part in distributed generation and the integration of the renewable energy to the power grid.
Solar energy i.e. energy from the sun provide consistent and steady source of solar power throughout the year. The main advantages are as follows; non-polluting renewable source, low maintainance, easy installation, can be used in remote locations, longer life of solar cells.
Impedance Source Converter
To overcome certain problems of the traditional VSI, an impedance-source (or impedance-fed) power converter (abbreviated as Z-source converter) is proposed, and it can be implemented for dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversions.
PWM of Power Converters
Pulse-width modulation is the process of modifying the width of the pulses in a pulse train in direct proportion to a small control signal; the greater the control voltage, the wider the resulting pulses become.
Power quality ideally creates a perfect power supply that is always available, has a pure noise-free sinusoidal wave shape, and is always within voltage and frequency tolerances.
Development of Impedance Source Converters
Z-source inverter was first proposed by Fang Zheng Peng in 2002. Since its inception it has got several topological modification for pararaters such as boosting factor and stress on switches. Several PWM techniques were also proposed for ZSI viz; simple boost control, maximum boost control, maximum constant boost control etc.
- Z-Source Inverter
- Quasi-Z-Source Inverter
- Extended Boost Z-Source Inverter
- Switched Inductor Z-Source Inverter
- Improved Z-Source Inverter
- Semi Z-Source Inverter
- Embedded Z-Source Inverter
- Switched Boost Inverter