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This paper presents a simple overmodulation method employed in direct torque control (DTC)-constant switching frequency (CSF) controller of induction machines. The proposed overmodulation method is utilized to extend a constant torque region and hence produces high torque capability in field weakening region with six-step operation. It will be shown that the overmodulation operation using the DTC-CSF...
A new method for controlling power factor corrector (PFC) is proposed based on the peak current method (PCM). Peak current method (PCM) is a well known method for controlling a PFC. However; it has some disadvantages as using analogue method of adding a ramp wave to the measured current. The proposed method utilizes a new digital approach instead of the traditional analogue control. In this paper,...
Multi level inverters have been widely accepted for high power high voltage applications. Their performance is highly superior to conventional two level inverters in reduced harmonic distortion, lower EMI (electro magnetic interference) and higher DC link voltages. However it has some disadvantages as increased number of components, complicated PWM control method, and voltage balancing problem at...
This paper presents a new simple overmodulation strategy in direct torque control (DTC) of induction machines. The strategy increases the inverter voltage limit and therefore extends the constant torque region. The minor modification on the conventional flux weakening method is also introduced to improve the torque capability in the field weakening region and hence improving the operation over a wide...
Fuel cell electric vehicles (FCEV) has higher efficiency and lower emissions compared with the internal combustion engine vehicles. But, the fuel cell has a slow dynamic response. Therefore, a secondary power source is needed during start up and transient conditions. Ultracapacitor can be used as secondary power source. By using ultracapacitor as the secondary power source of the FCEV, the performance...
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