Analysis and design of multi-stage distributed power systems

Cho, B.H.; Choi, Byungcho

doi:10.1109/intlec.1991.172400

Cited by 35 publications

(11 citation statements)

References 5 publications

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“…1 is to design the source converter (ac-dc converter in Fig. 1) using an unterminated modeling approach [21]. Then, based on the output impedance characteristics of the source converter, specification for the input impedance of load subsystem can be defined to ensure the system stability.…”

Section: DC System Small-signal Stability Analysis and Load Impedmentioning

confidence: 99%

“…[11] proposes to keep the minor loop-gain loci inside the unity circle on the complex plane, so that it never encircles the critical point (-1,0), and the system is stable (if there's no right half plane (RHP) pole). Transform to impedance of the system, this concept force the magnitude of the input impedance of the load subsystem to be larger than the magnitude of the output impedance of the source subsystem [11], [21]. However, this concept leads to too conservative impedance specification and bulky input filter for the load subsystem.…”

Section: DC System Small-signal Stability Analysis and Load Impedmentioning

confidence: 99%

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D-Q impedance specification for balanced three-phase AC distributed power system

Wen

Boroyevich

Burgos

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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In a dc distributed power system, small-signal stability is studied using Nyquist stability criterion. Forbidden region for the polar plot of the ratio of impedances at the interface between source and load subsystems can be defined. For a given source impedance, forbidden region can be transformed to a load impedance specification. System stability can be assured with certain margin while allowing source and load impedance overlap. Although small-signal stability and its margin of balanced three-phase ac system can be addressed using source and load impedances in synchronous reference (dq) frame, similar load impedance specification is not reported. This paper discusses the challenge of stability analysis in threephase ac system, namely its coupled multi-input multi-output (MIMO) nature. Then a method to do load impedances specification in d-q frame is proposed. Condition and limitation of the proposed method is discussed. Simulation and measurement verify the analysis.Index Terms-Distributed power system, impedance, smallsignal stability I.978-1-4799-6735-3/15/$31.00 ©2015 IEEE

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Section: DC System Small-signal Stability Analysis and Load Impedmentioning

confidence: 99%

Section: DC System Small-signal Stability Analysis and Load Impedmentioning

confidence: 99%

D-Q impedance specification for balanced three-phase AC distributed power system

Wen

Boroyevich

Burgos

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

View full text Add to dashboard Cite

show abstract

“…The load sharing problem in the multi-phase converter is very important because parameters of each converter have not same value [5] and active current balancing method increases design complexity of LLC-SRC. Therefore, design of multi-phase interleaved LLC-SRC is required that output current sharing can be realized automatically [5]- [9].…”

Section: Load Sharing Characteristic Of Multi-phasementioning

confidence: 99%

“…This load difference is smaller than that of Z th . Small load difference means that load sharing is improved [6]- [9]. Therefore, LLC-SRC can get the better load sharing characteristic in higher output impedance.…”

Section: Load Sharing Characteristic Of Multi-phasementioning

confidence: 99%

Analysis and design of two-phase interleaved LLC resonant converter considering load sharing

Kim

Park

Moon

2009

2009 IEEE Energy Conversion Congress and Exposition

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Recently, the LLC series resonant converter (LLC-SRC) is widely used for many applications because it has many advantages over other power converters. However, it is difficult to apply this topology to high current applications because the current ripple stress on the output capacitor becomes severely high. Nevertheless, it is possible to reduce the output current ripple drastically as employing the interleaved technique. However, to ensure output current sharing, multiphase interleaved LLC-SRC causes design difficulty of resonant tanks, which consists of magnetizing inductance (L M ), resonant inductance (L R ), and resonant capacitance (C R ). In this paper, design consideration to ensure output current sharing of multiphase interleaved LLC-SRC is proposed. In order to verify proposed design consideration, the laboratory experiments are executed and discussed with a 480W prototype.Index Terms-LLC series resonant converter, Load sharing, and Output impedance.

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“…To overcome this disadvantage, multi-phase LLC-SRC structures can be proposed. In multi-phase converter, load current must be distributed equally among the converter modules to improve the reliability [6]- [10]. However, the practical implementation of a multi-module power supply is not always same.…”

Section: Introductionmentioning

confidence: 99%

Load sharing characteristic of two-phase interleaved LLC resonant converter with parallel and series input structure

Kim

Park

Kim

et al. 2009

2009 IEEE Energy Conversion Congress and Exposition

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Recently, the LLC series resonant converter (LLC-SRC) is widely used for many applications because it has many advantages over other power converters. To apply LLC-SRC to high current application, it is necessary to interleaved operation to reduce output current ripple. Moreover, output current should be shared equally. However, active load share technique cannot be applied to output current divide equally because LLC SRC is regulated with frequency. Therefore, design of multi-phase interleaved LLC SRC is required that load current haring can be realized automatically. In this paper, two structures for interleaved LLC SRC are suggested. In the point of load share, two structures are analyzed. In order to verify proposed analyze, the laboratory experiments are executed and discussed with a 480W prototype.

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Analysis and design of multi-stage distributed power systems

Cited by 35 publications

References 5 publications

D-Q impedance specification for balanced three-phase AC distributed power system

D-Q impedance specification for balanced three-phase AC distributed power system

Analysis and design of two-phase interleaved LLC resonant converter considering load sharing

Load sharing characteristic of two-phase interleaved LLC resonant converter with parallel and series input structure

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