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This paper presents a new hybrid control strategy for control of Dual Active Bridge (DAB) based DC-DC Converter for bidirectional power flow control aimed for storage systems. The problems of DAB based DC-DC converter, viz., peaking of inrush current, increased reactive power transaction, decreased power transfer capability, slow dynamic response, circulating current, to name a few, are shown addressed...
Volts-per-hertz (V/f) controlled induction motor drive connected with LC filter may experience small-signal instabilities in different operating conditions and creates sustained oscillations in motor current, inverter current, motor voltage, developed torque and speed of the motor. This paper investigates the small signal instabilities of the drive at different speeds and load torques. This paper...
This paper presents a novel GaN switching power device-based DC-AC converter using Heterodyne Technique. Compared with the traditional DC/AC converters, the proposed converter has a simpler circuit topology with less number of high speed switching devices, thus making more efficient and cost-effective converter with reduced size and weight. By the aid of Heterodyne Technique, DC power is converted...
Microstepping drive for stepper motor is a well-known technique to improve stepper motor performance. Normally microstepping is carried at fixed pulse width planned. But this method is suitable only when motors are driven at fixed pre-defined speeds for non-real time applications. The problem discussed in this paper considers an application where motors need to track a given reference position profile...
Multilevel inverter technology has emerged recently as a very important alternative in the area of high power energy control. Number of topologies have been introduced and widely used in drive applications. Among these topologies, the cascaded H-Bridge inverter is used in this paper because of its advantages over other topologies. Different control techniques are available to control these inverter...
This paper presents a diagnostic study on the regular sampled Space Vector PWM (SVPWM) for sub-harmonics, when operated with fractional carrier ratios in variable frequency applications. Also a modified approach is proposed for refinement of the harmonic profile of SVPWM with a low computational dynamic sampling and carrier generation. When inverters are operated at fractional fundamental frequencies...
Proposed paper describes the implementation of a Trapezoidal Pulse Width Modulation (TPWM) technique to a single phase AC-AC frequency converter. TPWM is used to reduce the total harmonic distortion at the load output of a frequency converter. The converter can be utilized both for step up and step down operation as cyclo-inverter and cyclo-converter respectively. MATLAB/SIMULINK software environment...
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