MATRIX CONVERTER

Necessity of power conversion Disruption of environment such as global warming by energy consumption and exhaustion of energy resources are serious problemIn the industrial application, power conversion technology is effective for energy savingThus, Energy saving technology is in great DEMAND

AC-DC-AC power conversion Indirect power conversion deviceNecessity of energy storage components

Conventional VSI topologyConverter circuitInverter circuitEnergy storage components

Conducted EmissionPower ConverterPower SourceMotor Surge VoltageInput Current HarmonicsLeakage CurrentMotorShaft VoltageConventional PWM InverterSwitching lossInfluence on Power Source Influence on other devices by conductive noise Stress to power source by input current harmonics Influence on Power Converter Switching lossInfluence on Motor Insulation deterioration of motor winding by surge voltage Bearing degradation by high dv/dt of motor shaft voltageFig.1.Conventional PWM Inverter

Matrix converter topologyACAC AC-AC direct power conversion No large energy storage components Regeneration ability & Displacement factor control Reduced input harmonic current

Matrix converter

Modulation control

Matrix Converter FeaturesDirect conversion - No DC link - all silicon solutionNo restriction on input and output frequency withinlimits imposed by switching frequencyInherent bi-directional power flow (can be disabled) Sinusoidal input and output currentsPotential for high power density if switchingfrequency is high enoughOutput voltage limited to 87% of input voltage (formost modulation schemes)

Switch Configurations

MOST COMMONLY USED CONFIGURATION

A Bidirectional Switch In a Single Package

THREE PHASE MATRIX CONVERTERMatrix Converter Rotating Vectors (Synchronous Vectors)

Matrix Converter Rotating Vectors (Inverse Operation)Matrix Converter Zero Vectors

Matrix Converter Active Vectors (Pulsating)

Safe Snubber less Current Commutation

AdvantagesIt has sinusoidal input and output waveforms Power flow in a matrix converter is bi-directional. Its input power factor can be controlled fully. Its energy storage requirement is also very low.

DisadvantagesIts input to output voltage transfer ratio is limited to a particular value approx. 87%. Semiconductor devices used in matrix converters are more than cyclo-converters. Perceptive to disturbances.

Applications

conclusion

THANK YOU

*Now, disruption of environment such as global warming by energy consumption and exhaustion of energy resources are serious problem. Therefore, energy saving technology is strongly demanded. In the field of motor drive, power conversion technology is effective for energy saving. In the field of AC motor drive, inverter is widely used as AC adjustable speed drive. This inverter can generate variable voltage and variable frequency output from AC voltage source.*This is the basic circuit diagram of conventional Voltage source inverter. System consists of converter circuit and inverter circuit and energy storage components. It is an AC-to-AC indirect power conversion device. Its system is AC-DC-AC power conversion system. So, It is necessary for energy storage components.*As explained in the preceding slide, voltage source inverter is widely used as AC adjustable speed drives. On the other hand, various problems have been reported, as the number of inverters increases. Influence on power source is these. Influence on other devices by conductive noise. Stress to power source by input current harmonics. Influence on power converter is switching loss. Influence on power source is these. Insulation deterioration of motor winding by surge voltage. Bearing degradation by high dv/dt of motor shaft voltage.*This is the basic circuit diagram of Matrix converter. System consists of Input LC filter and nine bi-directional switches. Its an AC-to-AC direct power conversion system with out large energy storage components. It has regeneration ability, and displacement factor control ability. Matrix converter system can be reduced input harmonic current, when suitable PWM switching strategy is adopted.