تصفح حسب المؤلف "Ashraf, I."
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Control Methods for Minimizing Cross Regulation in Single Inductor Multiple Output Converters : A Review
Samiullah, M.; Iqbal, Atif; Ashraf, I.; Mohammad, A.; Hussan, R. ( Springer , 2020 , Conference Paper)Single Inductor Multiple Output (SIMO) converter provides a cost-effective alternative to conventional power converters, which have more than one output. Its potential applications include portable devices, where multiple ... -
Double switch two leg high gain boost converter for renewable energy applications in a DC microgrid
Samiullah, M.; Ashraf, I.; Iqbal, Atif; Lam, J.; Maroti, Pandav Kiran ( Institute of Electrical and Electronics Engineers Inc. , 2020 , Conference Paper)The voltage output at the terminals of a DC generating source such as Photovoltaic and Fuel cells is not enough to be integrated with the DC bus of a microgrid. Therefore, an efficient DC-DC converter is demanded for ... -
Genetic Algorithm based SHE-PWM for 1- ø and 3- ø Voltage Source Inverters
Kumari, M.; Ali, M.; Ahmad, Salman; Ashraf, I.; Azeem, A.; Tariq, M.; Bin Arif, M. Saad; Iqbal, Atif... more authors ... less authors ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Conference Paper)In medium voltage high power application of voltage source inverter (VSI), low switching frequency pulse width modulation (LSPWM) techniques offer better efficiency and better thermal management as the switching loss ... -
Harmonics minimization in 3-level inverter waveform and its FPGA realization
Ahmad S.; Ganie Z.A.; Ashraf I.; Iqbal A. ( Institute of Electrical and Electronics Engineers Inc. , 2018 , Conference Paper)The multilevel inverter (MLI) is more preferred for medium voltage high power application as it produces better quality voltage waveforms (stepped in nature) with reduced harmonic distortion (less THD), operates at less ... -
High gain switched-inductor-double-leg converter with wide duty range for dc microgrid
Samiullah Md.; Bhaskar M.S.; Meraj M.; Iqbal A.; Ashraf I.; Komurcugil H.... more authors ... less authors ( Institute of Electrical and Electronics Engineers Inc. , 2021 , Article)In a dc microgrid, efficient high gain converters are needed to raise the voltage level of low voltage power sources such as photovoltaic, fuel cells, etc. In this article, a high-gain switched-inductor-double-leg converter ... -
Low switching frequency modulation of a 3 x 3 matrix converter in UPFC application using differential evolution method
Ahmad, Salman; Al-Hitmi, Mohammed; Iqbal, Atif; Rahman, K.; Ashraf, I. ( John Wiley and Sons Ltd , 2020 , Article)This paper presents a low switching frequency–based pulse width modulation technique for a 3 × 3 indirect matrix converter. The nontriplen lower-order harmonics are considered for minimization using differential evolution–based ... -
Low-order harmonics control in staircase waveform useful in high-power application by a novel technique
Ahmad S.; Al-Hitmi M.; Iqal A.; Ashraf I.; Meraj M.; Padmanaban S.... more authors ... less authors ( John Wiley and Sons Ltd , 2019 , Article)Few switching transition in high-power and medium-voltage application of power converters is desirable. The optimal pulse-width modulation (OPWM) at fundamental switching frequency offers a better quality waveform at lower ... -
Selective harmonic elimination in awide modulation range using modified Newton-raphson and pattern generation methods for a multilevel inverter
Al-Hitmi M.; Ahmad S.; Iqbal A.; Padmanaban S.; Ashraf I. ( MDPI AG , 2018 , Article)Considering the aim of having low switching losses, especially in medium-voltage and high-power converters, the pre-programmed pulse width modulation technique is very useful because the generated harmonic content can be ... -
Selective harmonics elimination in multilevel inverter by a derivative-free iterative method under varying voltage condition
Ahmad S.; Meraj M.; Iqbal A.; Ashraf I. ( ISA - Instrumentation, Systems, and Automation Society , 2019 , Article)Selective Harmonics Elimination Pulse width modulation (SHE PWM) presents an alternative modulation technique to operate medium voltage medium and high power converters as it reduces the switching losses. SHE PWM generates ... -
SHE PWM for multilevel inverter using modified NR and pattern generation for wide range of solutions
Ahmad, Salman; Ashraf, I.; Iqbal, Atif; Fatimi, M. A. A. ( Institute of Electrical and Electronics Engineers Inc. , 2018 , Conference Paper)In medium voltage high power applications good quality waveform with low switching losses is more preferred. In this context, low switching frequency modulation techniques based on pre-computed PWM switching patterns is ... -
V/f Control of Five-Phase Induction Motor Drive Fed from Cascaded H Bridge Multilevel Inverter
Rahman, K.; Rahman, Syed; Samiullah, M.; Iqbal, Atif; Ashraf, I. ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Conference Paper)A multilevel inverter has its own advantages over normal inverters for high voltage applications such as reduced harmonics, and better AC output. Multi-levels are realized by different techniques e.g. Flying capacitors, ...