The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Ned Mohan - One of the best experts on this subject based on the ideXlab platform.
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novel soft switching dc dc converter with full zvs range and reduced filter requirement i regulated output applications
IEEE Transactions on Power Electronics, 2001Co-Authors: Rajapandian Ayyanar, Ned MohanAbstract:A novel soft-switching topology for DC-DC converters is proposed. It is well suited for applications in the range of a few hundred watts to a few kilowatts. It is essentially a Hybrid combination of an uncontrolled half-bridge section and a phase-shift controlled full-bridge section, realized with just four switches. The main features of the proposed topology are zero-voltage-switching down to no-load without serious conduction loss penalty, constant frequency operation and, near-ideal filter waveforms. The improved filter waveforms result in significant savings in the input and output filter requirement, resulting in high power-density. The new topology requires two transformers and two DC-bypass capacitors. The combined VA rating of the two transformers is more than that of the single transformer of conventional full-bridge converters, for variable-input applications. In Part I of the paper, the converter operation is analyzed for typical switch-mode power supply applications, where the input voltage varies widely but the output voltage is fixed and is well regulated. Experimental results obtained from a 100 W/200 kHz proof-of-concept prototype confirm the superior features of the proposed Hybrid Configuration.
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novel soft switching dc dc converter with full zvs range and reduced filter requirement ii constant input variable output applications
IEEE Transactions on Power Electronics, 2001Co-Authors: Rajapandian Ayyanar, Ned MohanAbstract:For pt.I see ibid., vol.16, no.2, p.184-92 (2001). The performance of the Hybrid converter featuring zero-voltage-switching (ZVS) down to no-load and significant reduction in the filter requirement, proposed in Part I of this paper, is analyzed here for constant-input, variable-output applications. For these applications, the main drawback of the Hybrid converter, namely the increased transformer rating is eliminated. The advantages of the Hybrid Configuration like the reduction in filter rating and full-load ZVS with negligible penalty on conduction loss, are retained. An extension of the basic Hybrid converter-a combination of two full-bridges using six switches is proposed. This Configuration is well suited for applications above a few kilowatts, and results in significant reduction in the ripple current rating of the input filter capacitor. Experimental results obtained from a 1 kW/100 kHz prototype are presented.
Rajinder Singh Kaler - One of the best experts on this subject based on the ideXlab platform.
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novel optical flat gain Hybrid amplifier for dense wavelength division multiplexed system
IEEE Photonics Technology Letters, 2014Co-Authors: Simranjit Singh, Rajinder Singh KalerAbstract:For the first time, a novel flat-gain optical amplifier is proposed using a Hybrid Configuration with an Er-Yb co-doped waveguide amplifier (EYDWA) and a semiconductor optical amplifier (SOA) for 100 × 10-Gb/s dense wavelength division multiplexed system at 0.2 nm interval. With an EYDWA-SOA Hybrid amplifier, a flat gain of is obtained across the effective bandwidth with a gain variation of the order of 0.75 dB without using any gain clamping techniques. It is observed that when the proposed Hybrid amplifier is used as a booster for Hybrid distributed Raman amplifier and erbium doped fiber amplifier, the gain variation is reduced from 2.01 to ~ 1.15 dB efficiently with acceptable bit error rate.
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Flat-gain L-band raman-EDFA Hybrid optical amplifier for dense wavelength division multiplexed system
IEEE Photonics Technology Letters, 2013Co-Authors: Simranjit Singh, Rajinder Singh KalerAbstract:An efficient gain-flattened L-band optical amplifier is demonstrated using a Hybrid Configuration with a distributed Raman amplifier (DRA) and an erbium-doped fiber amplifier (EDFA) for 160 × 10-Gb/s dense wavelength division multiplexed system at 25-GHz interval. With an input signal power of 3 mW, a flat gain of >; 10 dB is obtained across the frequency range from 187 to 190.975 THz with a gain variation of ; 8.9 dBm) ever reported for a DRA-EDFA Hybrid optical amplifier at reduced channel spacing.
Rajapandian Ayyanar - One of the best experts on this subject based on the ideXlab platform.
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novel soft switching dc dc converter with full zvs range and reduced filter requirement i regulated output applications
IEEE Transactions on Power Electronics, 2001Co-Authors: Rajapandian Ayyanar, Ned MohanAbstract:A novel soft-switching topology for DC-DC converters is proposed. It is well suited for applications in the range of a few hundred watts to a few kilowatts. It is essentially a Hybrid combination of an uncontrolled half-bridge section and a phase-shift controlled full-bridge section, realized with just four switches. The main features of the proposed topology are zero-voltage-switching down to no-load without serious conduction loss penalty, constant frequency operation and, near-ideal filter waveforms. The improved filter waveforms result in significant savings in the input and output filter requirement, resulting in high power-density. The new topology requires two transformers and two DC-bypass capacitors. The combined VA rating of the two transformers is more than that of the single transformer of conventional full-bridge converters, for variable-input applications. In Part I of the paper, the converter operation is analyzed for typical switch-mode power supply applications, where the input voltage varies widely but the output voltage is fixed and is well regulated. Experimental results obtained from a 100 W/200 kHz proof-of-concept prototype confirm the superior features of the proposed Hybrid Configuration.
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novel soft switching dc dc converter with full zvs range and reduced filter requirement ii constant input variable output applications
IEEE Transactions on Power Electronics, 2001Co-Authors: Rajapandian Ayyanar, Ned MohanAbstract:For pt.I see ibid., vol.16, no.2, p.184-92 (2001). The performance of the Hybrid converter featuring zero-voltage-switching (ZVS) down to no-load and significant reduction in the filter requirement, proposed in Part I of this paper, is analyzed here for constant-input, variable-output applications. For these applications, the main drawback of the Hybrid converter, namely the increased transformer rating is eliminated. The advantages of the Hybrid Configuration like the reduction in filter rating and full-load ZVS with negligible penalty on conduction loss, are retained. An extension of the basic Hybrid converter-a combination of two full-bridges using six switches is proposed. This Configuration is well suited for applications above a few kilowatts, and results in significant reduction in the ripple current rating of the input filter capacitor. Experimental results obtained from a 1 kW/100 kHz prototype are presented.
Simranjit Singh - One of the best experts on this subject based on the ideXlab platform.
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novel optical flat gain Hybrid amplifier for dense wavelength division multiplexed system
IEEE Photonics Technology Letters, 2014Co-Authors: Simranjit Singh, Rajinder Singh KalerAbstract:For the first time, a novel flat-gain optical amplifier is proposed using a Hybrid Configuration with an Er-Yb co-doped waveguide amplifier (EYDWA) and a semiconductor optical amplifier (SOA) for 100 × 10-Gb/s dense wavelength division multiplexed system at 0.2 nm interval. With an EYDWA-SOA Hybrid amplifier, a flat gain of is obtained across the effective bandwidth with a gain variation of the order of 0.75 dB without using any gain clamping techniques. It is observed that when the proposed Hybrid amplifier is used as a booster for Hybrid distributed Raman amplifier and erbium doped fiber amplifier, the gain variation is reduced from 2.01 to ~ 1.15 dB efficiently with acceptable bit error rate.
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Flat-gain L-band raman-EDFA Hybrid optical amplifier for dense wavelength division multiplexed system
IEEE Photonics Technology Letters, 2013Co-Authors: Simranjit Singh, Rajinder Singh KalerAbstract:An efficient gain-flattened L-band optical amplifier is demonstrated using a Hybrid Configuration with a distributed Raman amplifier (DRA) and an erbium-doped fiber amplifier (EDFA) for 160 × 10-Gb/s dense wavelength division multiplexed system at 25-GHz interval. With an input signal power of 3 mW, a flat gain of >; 10 dB is obtained across the frequency range from 187 to 190.975 THz with a gain variation of ; 8.9 dBm) ever reported for a DRA-EDFA Hybrid optical amplifier at reduced channel spacing.
Joao P S Catalao - One of the best experts on this subject based on the ideXlab platform.
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frequency regulation in Hybrid power systems using particle swarm optimization and linear matrix inequalities based robust controller design
International Journal of Electrical Power & Energy Systems, 2014Co-Authors: Shashi Kant Pandey, Soumya R Mohanty, Nand Kishor, Joao P S CatalaoAbstract:It is often necessary to investigate the output power against load demand in a system having distributed generation (DG) resources connected to the existing conventional power system. In this paper, the load frequency control (LFC) problem is presented using different optimization algorithms for two types of power system Configurations: (i) Hybrid Configuration of thermal power system (TPS) integrated with DG, comprising wind turbine generators (WTGs), diesel engine generators (DEGs), fuel cells (FCs), aqua-electrolyzer (AE) and battery energy storage system (BESS); (ii) two area interconnected power system with DG connected in area-1. The inclusion of wind energy system in DG, having high variability in its output power, results into a challenging task for the realization of an effective controller design. This difficulty is further enhanced with random variation of load demand. The control scheme proposed in this paper is based on linear matrix inequalities (LMI) with its parameters tuned by particle swarm optimization (PSO), as a new contribution to earlier studies. The robustness of this controller is thoroughly demonstrated in the above Hybrid power systems with different conditions of load disturbances, wind power and parameter variations.
