Abstract: | The matrix converter is an array of controlled semiconductor switches that connects directly the three-phase source to the three-phase load. The main advantage of MCs is the absence of bulky reactive elements, which are subject to ageing, and reduce the system reliability, it is the good alternative of conventional variable frequency drive. The Matrix Converter uses bidirectional fully controlled switches for direct conversion from ac to ac. It is a single stage converter that requires only nine bidirectional switches for three phase to three phase conversion. The nine bidirectional switches are arranged so that any of the input phase can be connected to any of the output phase. Space Vector Modulation technique can be considered the best solution for the possibility to achieve the highest voltage transfer ratio, to optimize the switching pattern, to reduce output voltage and input current harmonics. In the project we direct three phase AC to 3-by-3 matrix arrangement pattern of MOSFETs, biased by set of nine optocouplers, to get three phase AC output of desired frequency and voltage level. There are several advantages of Direct matrix Converter: No Dc Link (reactive energy storage element capacitor), higher lifetime of converter, Regenerative, Bidirectional power flow, High Efficiency, more than 90%, Fully controlled output frequency, Low switching losses, Fully Controlled Output Voltage, Four quadrant operation. There are several applications of Direct matrix Converter: Variable Frequency Drive, Direct Torque Control of induction motor and permanent magnet synchronous motor, Speed control of AC machines, Wind generation systems, Pumps, Fans, Paper and Textile mills, elevators, electric vehicles, subway transportation, home appliances, robotics, steel and cement mills, etc. |
