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Matrix Converter Technology Development Matrix converter is an "all silicon" solution for AC-AC conversion, removing the need for reactive energy storage components used in conventional rectifierinverter based systems. Converter topology and control technique of a Matrix Converter is established through this development project. This is a joint activity by CDAC, Thiruvananthapuram and IISc Bangalore. A direct 3 Phase to 3 Phase Matrix Converter consists of nine bi-directional switches that are used to connect the input phases directly to the output phases of the converter. The switching of these bi-directional switches is then modulated to produce the desired output voltage and frequency. Matrix converters offer many advantages over traditional topologies such as the ability to regenerate energy back to the utility, sinusoidal input and output currents and controllable input current displacement factor. The size of the converter can also be reduced since there are no large reactive components for energy storage. Major applications are listed below. • m phase to n phase conversion • All silicon motor drives with capability of regeneration • Grid interface for non conventional energy sources • Variable voltage, variable frequency power supplies The development of the above technology involved the development of various critical sub systems and algorithm for switching modulation. The control of Matrix Converter is achieved with a Micro controller-FPGA based digital hardware with suitable intelligence to execute the controlled commutation of the bi directional switches. A circuit for sensing of current direction was integrated in the gate drive circuit. ‘Venturini modulation’ strategy was implemented and used for direct matrix converter. Outcome One proto unit with a rating of 50kVA is developed and demonstrated as a part of this project. A 5kVA proto unit is also developed and demonstrated in various exhibitions. Proto developed at CDAC Proto developed at IISc At rated load the input PF is unity and the THD of input current is 2.5%. As a part of this project a 5kVA proto unit of Direct Matrix Converter is developed and tested by IISc Bangalore Technology Development Future scope The converter topology, control circuits and the algorithm for control of the converter etc. has been developed and thoroughly tested in this project. The technology shall be extended for suitable applications. To start with, the system has been tested as a static frequency converter and as an induction motor drive. More developments shall be undertaken in the following applications. • Frequency changing static power supply application like aircraft ground power supply • Development of Matrix Converter as an AC drive considering industrial requirements • Using Matrix Converter as grid interface for non-conventional AC sources. • Application of Matrix converters in EVs and hybrid EVs. • Matrix converter for applications like Loop Power Flow Controller in power systems. Loop power flow controllers are relevant to power system with large scale distributed generation.