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RISS 인기검색어
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- 저자 : Merlin Chai (검색결과 2 건)
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Naga Brahmendra Yadav Gorla,Sandeep Kolluri,Merlin Chai,Sanjib Kumar Panda 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Three-stage solid state transformer (SST) consists of a multilevel AC-DC converter in stage-1 followed by dual active bridge (DAB) isolated DC-DC converters in stage-2 and a three-phase inverter in stage-3. The output filters of stage-1 are designed to filter both switching frequency based harmonics and second harmonic ripple generated due to singlephase power processing. As a result, the use of less reliable electrolytic capacitors in stage-1 is inevitable. In this paper, a new control scheme is proposed for the SST to transfer the second harmonic ripple current from the output of stage-1 to the output of stage-2 in each phase. When the three phases are connected at the output of stage-2, the second harmonic ripple currents which are phase shifted by 2π/3 radians add to zero. As a result, the capacitive filter requirement at the medium voltage DC (MVDC) bus is reduced, which is realized using reliable film capacitors. The operating principles along with detailed mathematical analysis and simulation results are presented.
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Comprehensive Loss Analysis of Isolated Bidirectional Matrix based AC-DC Converter
Prathamesh Pravin Deshpande,Amit Kumar Singh,Hau Chong Aih,Merlin Chai,Sanjib Kumar Panda 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper a comparison of traditional two stage back-to-back AC-DC converter with matrix based ACDC converter using comprehensive loss analysis is presented. The two-stage AC-DC converter uses a boost rectifier with power factor correction at the grid side while a full bridge converter at the load end. A current control based closed loop control is developed for the grid end converter while synchronous rectification is used for the corresponding half when full bridge converter is operated in the bidirectional mode. Matrix based AC-AC converter eliminates the use of DC-link and hence the bulky DC link capacitor. Space Vector Modulation based switching scheme is used for matrix based single stage converter. As, the matrix based converter uses back-to-back switches, it contributes to maximum proportion of the total loss followed by input LC filter and controlled rectifier part of the AC-DC converter. Maximum efficiency calculated is about 95.5 % for the matrix based converter, while for two stage converter is about 80 %. Matrix based converter provides higher efficiency, power density, reliability, etc.
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