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- 저자 : Ravi Lal (검색결과 2 건)
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Comparison of Phase Lock Loops of PWM Converters under Voltage Disturbance
Ravi Mohan Lal,조병극,설승기 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.4
This paper reviews state of the art algorithms for determining phase angle information of utility grid voltage under non-ideal grid conditions. An accurate estimate of phase angle is essential in power conversion systems for reference sinusoidal signal generation in order to meet power quality standards in grid connected converters. In practice, various fault conditions leads to different grid conditions and the acquisition of accurate phase angle becomes important for the control of power factor, active/reactive power control and for harmonic compensation. This paper provides brief description of synchronization techniques, together with comparative analysis of modern synchronization methods using simulations to show their capability to track the phase angle information and extraction of their positive sequence components.
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Bo Pang,Luis E. Valencia,Jessica Wang,Yao Wan,Ravi Lal,Amin Zargar,Jay D. Keasling 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.3
Modular type I polyketide synthases (PKSs) are multifunctional proteins that are comprised of individual domains organized into modules. These modules act together to assemble complex polyketides from acyl-CoA substrates in a linear fashion. This assembly-line enzymology makes engineered PKSs a potential retrobiosynthetic platform to produce fuels, commodity chemicals, speciality chemicals, and pharmaceuticals in various host microorganisms, including bacteria and fungi. However, the realization of this potential is restricted by practical difficulties in strain engineering, protein overexpression, and titer/yield optimization. These challenges are becoming more possible to overcome due to technical advances in PKS design, engineered heterologous hosts, DNA synthesis and assembly, PKS heterologous expression, and analytical methodology. In this review, we highlight these technical advances in PKS engineering and provide practical considerations thereof.
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