RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제
      • 좁혀본 항목 보기순서

        • 원문유무
        • 원문제공처
        • 등재정보
          펼치기
        • 학술지명
        • 주제분류
        • 발행연도
        • 작성언어
        • 저자
          펼치기

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • SCIESCOPUSKCI등재

        A Novel Pulse-Width and Amplitude Modulation (PWAM) Control Strategy for Power Converters

        Ghoreishy, Hoda,Varjani, Ali Yazdian,Farhangi, Shahrokh,Mohamadian, Mustafa The Korean Institute of Power Electronics 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.4

        Typical power electronic converters employ only pulse width modulation (PWM) to generate specific switching patterns. In this paper, a novel control strategy combining both pulse-width and amplitude modulation strategies (PWAM) has been proposed for power converters. The Pulse Amplitude Modulation (PAM), used in communication systems, has been applied to power electronic converters. This increases the degrees of freedom in eliminating or mitigating harmonics when compared to the conventional PWM strategies. The role of PAM in the novel PWAM strategy is based on the control of the converter's dc sources values. Software implementation of the conventional PWM and the PWAM control strategies has been applied to a five-level inverter for mitigating selective harmonics. Results show the superiority of the proposed strategy from the THD point of view along with a reduction in the inverter power dissipation.

      • SCIESCOPUSKCI등재

        A New Maximum Inductive Power Transmission Capacity Tracking Method

        Ameri, Mohammad Hassan,Varjani, Ali Yazdian,Mohamadian, Mustafa The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6

        In certain applications, such as IPT-based EV charger (IPTEC), any variation in alignment and distance between pickup and charger primary leads to a change in leakage and magnetic impedance magnitudes. The power transmission capacity is not always at the maximum level because of these variations. This study proposes a new low-cost tracking method that achieves the Maximum Inductive Power Transmission Capacity (MIPTC). Furthermore, in the proposed method, the exchange of information between load and source is not required. For an application such as IPTEC, the load detected by the IPTEC varies continuously with time because of the change in state of the charge. This load variation causes a significant variation in IPT resonant circuit voltage gain. However, the optimized charging output voltage should be kept constant. From the analysis of the behavior of the IPT circuit at different working frequencies and load conditions, a MIPTC operation point that is independent of load condition can be identified. Finally, the experimental results of a developed prototype IPT circuit test show the performance of the proposed method.

      • SCISCIESCOPUS

        Biobutanol as a promising liquid fuel for the future - recent updates and perspectives

        Pugazhendhi, Arivalagan,Mathimani, Thangavel,Varjani, Sunita,Rene, Eldon R.,Kumar, Gopalakrishnan,Kim, Sang-Hyoun,Ponnusamy, Vinoth Kumar,Yoon, Jeong-Jun Elsevier 2019 Fuel Vol.253 No.-

        <P><B>Abstract</B></P> <P>Butanol is a potential alternative fuel for compensating the depletion of fossil based liquid fuels. Butanol can be easily mixed with either gas or petrol, at any percentage and used as a fuel. <I>Clostridia</I> are the main fermentative organisms used for the production of biobutanol. They are potentially known for their capacity to ferment different types of renewable biomass to butanol through the acetone-butanol-ethanol (ABE) fermentation pathway. This review deals with the mechanism of biobutanol production from biomass feedstocks and the issues and challenges involved in the production of biobutanol. The different types of anaerobic biobutanol production namely fed-batch fermentation, continuous fermentation, and two-stage continuous fermentation have been clearly enunciated. Further, different butanol recovery methods such as adsorption, gas stripping and pervaporation have also been discussed in this review. Certain issues affecting the biobutanol production such as sporulation and solventogenesis have been summarized. These types of problems could be overcome by metabolic engineering of <I>Clostridia</I>, which will enhance the resistance of the microorganisms towards high solvent concentrations and thereby increasing the solvent production. The genetic engineering approach is able to overcome the constraints with wild-type strain by understanding the process of solventogenesis in order to construct or modify the strains with improved downstream processing potential for economically advantageous biobutanol production.</P>

      • KCI등재

        A Novel Pulse-Width and Amplitude Modulation (PWAM) Control Strategy for Power Converters

        Hoda Ghoreishy,Ali Yazdian Varjani,Shahrokh Farhangi,Mustafa Mohamadian 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.4

        Typical power electronic converters employ only pulse width modulation (PWM) to generate specific switching patterns. In this paper, a novel control strategy combining both pulse-width and amplitude modulation strategies (PWAM) has been proposed for power converters. The Pulse Amplitude Modulation (PAM), used in communication systems, has been applied to power electronic converters. This increases the degrees of freedom in eliminating or mitigating harmonics when compared to the conventional PWM strategies. The role of PAM in the novel PWAM strategy is based on the control of the converter’s dc sources values. Software implementation of the conventional PWM and the PWAM control strategies has been applied to a five-level inverter for mitigating selective harmonics. Results show the superiority of the proposed strategy from the THD point of view along with a reduction in the inverter power dissipation.

      • KCI등재

        A New Maximum Inductive Power Transmission Capacity Tracking Method

        Mohammad Hassan Ameri,Ali Yazdian Varjani,Mustafa Mohamadian 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6

        In certain applications, such as IPT-based EV charger (IPTEC), any variation in alignment and distance between pickup and charger primary leads to a change in leakage and magnetic impedance magnitudes. The power transmission capacity is not always at the maximum level because of these variations. This study proposes a new low-cost tracking method that achieves the Maximum Inductive Power Transmission Capacity (MIPTC). Furthermore, in the proposed method, the exchange of information between load and source is not required. For an application such as IPTEC, the load detected by the IPTEC varies continuously with time because of the change in state of the charge. This load variation causes a significant variation in IPT resonant circuit voltage gain. However, the optimized charging output voltage should be kept constant. From the analysis of the behavior of the IPT circuit at different working frequencies and load conditions, a MIPTC operation point that is independent of load condition can be identified. Finally, the experimental results of a developed prototype IPT circuit test show the performance of the proposed method.

      • KCI등재후보

        Power Quality Improvement of an Electric Arc Furnace Using a New Universal Compensating System

        Ahmad Esfandiari,Mostafa Parniani,Hossein Mokhtari,Ali Yazdian-Varjani 전력전자학회 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.3

        This paper presents a new compensating system, consisting of series and shunt active filters, for mitigating voltage and current disturbances. The shunt filter is used to compensate for unbalanced and distorted load currents. The series filter comprises two inverters, used to suppress voltage disturbances and handle source currents independently. This configuration is devised to reduce the overall cost of active compensators by using low-frequency high-current switches for the latter inverter. The filters are controlled separately using a novel control strategy. Since voltages at the point of common coupling contain interharmonics, conventional methods cannot be used for extracting voltage references. Therefore, voltage references are obtained from generated sinusoidal waveforms by a phase-locked loop. Current references are detected based on rotating frame vector mapping. Simulation results are presented to verify the system.

      • Selective production of volatile fatty acids at different pH in an anaerobic membrane bioreactor

        Khan, Mohd Atiqueuzzaman,Ngo, Huu Hao,Guo, Wenshan,Chang, Soon Woong,Nguyen, Dinh Duc,Varjani, Sunita,Liu, Yi,Deng, Lijuan,Cheng, Chen Elsevier 2019 Bioresource technology Vol.283 No.-

        <P><B>Abstract</B></P> <P>This study investigated the production of major volatile fatty acid (VFA) components in an anaerobic membrane bioreactor (AnMBR) to treat low-strength synthetic wastewater. No selective inhibition was applied for methane production and solvent-extraction method was used for VFA extraction. The results showed acetic and propionic acid were the predominant VFA components at pH 7.0 and 6.0 with concentrations of 1.444 ± 0.051 and 0.516 ± 0.032 mili-mol/l respectively. At pH 12.0 isobutyric acid was the major VFA component with a highest concentration of 0.712 ± 0.008 mili-mol/l. The highest VFA yield was 48.74 ± 1.5 mg VFA/100 mg COD<SUB>feed</SUB> at pH 7.0. At different pH, AnMBR performance was evaluated in terms of COD, nutrient removal and membrane fouling rate. It was observed that the membrane fouled at a faster rate in both acidic and alkaline pH conditions, the slowest rate in membrane fouling was observed at pH 7.0.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Concentrations of VFA components were observed at different pH in AnMBR. </LI> <LI> Acetic acid was predominant VFA component at pH 6.0 and 7.0. </LI> <LI> Highest concentration for isobutyric acid was observed at pH 12.0. </LI> <LI> The highest overall VFA yield was 48.74 ± 1.5 mg VFA/100 mg COD<SUB>feed</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼