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When applying a load torque to an ultrasonic motor, a dead-zone occurs in the control input. A nonlinear adaptive control, which considers dead-zones, is consequently proposed for the motor. To implement the proposed control strategy, a microcomputer and an embedded system are employed. The state quantities, such as acceleration, speed, and position, are required to apply digital implementation. However,...
Multilevel inverters are important for power electronics applications and have become attractive in the power industries. It can be applied in many applications especially on improvement of the power quality such as in renewable energy sources, flexible AC transmission systems, uninterruptible power supplies and active power filters. Usually, a transformerless battery energy storage system based on...
Multilevel inverters are emerging as a new breed of power converter options for power system applications. Recent advances in power switching devices enabled the suitability of multilevel inverters for high voltage and high power applications because they are connecting several devices in series without the need of component matching. Usually, a transformerless battery energy storage system based...
Ultrasonic motor offers great advantages for industrial applications due to its excellent intrinsic properties. However, when load torque is applied, a dead-zone occurs in the control input. Therefore, a digital controller is adopted for ultrasonic motor. The state quantities, such as acceleration, speed and position, are needed to apply the digital controller for position control. Yet, rotary encoder...
This paper presents a control method for maximum power point tracking (MPPT) of a wind energy conversion system (WECS) using online parameter identification. The WECS is based on a permanent magnet synchronous generator (PMSG) and transmits its electrical power to an AC grid through an AC-DC-AC converter system with IGBT pulse-width modulation (PWM) converters. The generator-side converter optimally...
It is issue that reduction of carbon-dioxide emissions to prevent global warming. The PV(photovoltaic) system technologies are rapidly expanding and have increasing roles in electric power technology and regarded as the green energy. But, the increasing of PV system results in the fluctuating power from changing amount of solar insolation and temperature of solar cell. Moreover, partial shadowing...
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