A novel advanced soft punch through（SPT） IGBT signed as SPTC-IGBT is investigated.Static and dynamic characteristics are simulated based on the 1200 V device structure and adopted technology.Extensive research on th...A novel advanced soft punch through（SPT） IGBT signed as SPTC-IGBT is investigated.Static and dynamic characteristics are simulated based on the 1200 V device structure and adopted technology.Extensive research on the structure optimization of SPTC-IGBT is presented and discussed.Compared with the structure of conventional IGBT,SPTC-IGBT has a much lower collector-emitter saturation voltage and better switching characteristics.Therefore it is very suitable for applications blocking a voltage higher than 3000 V.In addition,due to the improvement of switching speed achieved by using a thinner chip,SPTC-IGBT is also very competitive in 1200 V and 1700 V applications.展开更多
Nowadays,the recompression supercritical carbon dioxide(R-SCO_(2))cycle has emerged as a promising option for power conversion systems because of its boundless potential to tackle energy and environmental issues.In th...Nowadays,the recompression supercritical carbon dioxide(R-SCO_(2))cycle has emerged as a promising option for power conversion systems because of its boundless potential to tackle energy and environmental issues.In this study,we examined the performance of the solar parabolic trough collector(SPTC)integrated combined cogeneration system for the purpose of power generation as well as recovery of waste exhaust heat from the R-SCO_(2) cycle with the help of the organic Rankine cycle(ORC).An exergy and energy analysis was performed for a combined recompression cycle(R-SCO_(2)-ORC)by varying the input variables such as intensity of solar irradiation(Gb),pressure at the inlet of SCO_(2) turbine(P_(5)),mass flow rate of SCO_(2)()&mSCO_(2) inlet temperature of SCO_(2) turbine(T5),inlet temperature of main compressor(T_(9))and effectiveness of the high-and low-temperature recuperator( HTR and LTR).Eight organic working fluids were considered for the ORC:R123,R290,isobutane,R1234yf,R1234ze,toluene,isopentane and cyclohexane.The study revealed that R123-based R-SCO_(2)-ORC demonstrates the highest thermal and exergy efficiency:~73.4 and 40.89%at G_(b)=0.5 kW/m^(2);78.8 and 43.9%at P_(5)=14 MPa;63.86 and 35.57%at T5=650 K;74.84 and 41.69%at&mSCO 7kg s;2=/85.83 and 47.82%at T_(9)=300 K;84.57 and 47.11%at HTR 65;=0.85.06 and 47.38%at LTR 65,=0.respectively.Alternatively,R290 showed the minimum value of exergy and thermal efficiency.As can be seen,the maximum amount of exergy destruction or exergy loss occurs in a solar collector field,~58.25%of the total exergy destruction rate(i.e.6703 kW)and 18.99%of the solar inlet exergy(i.e.20562 kJ).Moreover,R123 has the highest net work output,~4594 kJ at T5=650 K and 6176 kJ at T_(9)=300 K.展开更多
基金Project supported by the National Major Science and Technology Special Project of China (Nos.2011ZX02504-002,2011ZX02603-002)
文摘A novel advanced soft punch through（SPT） IGBT signed as SPTC-IGBT is investigated.Static and dynamic characteristics are simulated based on the 1200 V device structure and adopted technology.Extensive research on the structure optimization of SPTC-IGBT is presented and discussed.Compared with the structure of conventional IGBT,SPTC-IGBT has a much lower collector-emitter saturation voltage and better switching characteristics.Therefore it is very suitable for applications blocking a voltage higher than 3000 V.In addition,due to the improvement of switching speed achieved by using a thinner chip,SPTC-IGBT is also very competitive in 1200 V and 1700 V applications.
文摘Nowadays,the recompression supercritical carbon dioxide(R-SCO_(2))cycle has emerged as a promising option for power conversion systems because of its boundless potential to tackle energy and environmental issues.In this study,we examined the performance of the solar parabolic trough collector(SPTC)integrated combined cogeneration system for the purpose of power generation as well as recovery of waste exhaust heat from the R-SCO_(2) cycle with the help of the organic Rankine cycle(ORC).An exergy and energy analysis was performed for a combined recompression cycle(R-SCO_(2)-ORC)by varying the input variables such as intensity of solar irradiation(Gb),pressure at the inlet of SCO_(2) turbine(P_(5)),mass flow rate of SCO_(2)()&mSCO_(2) inlet temperature of SCO_(2) turbine(T5),inlet temperature of main compressor(T_(9))and effectiveness of the high-and low-temperature recuperator( HTR and LTR).Eight organic working fluids were considered for the ORC:R123,R290,isobutane,R1234yf,R1234ze,toluene,isopentane and cyclohexane.The study revealed that R123-based R-SCO_(2)-ORC demonstrates the highest thermal and exergy efficiency:~73.4 and 40.89%at G_(b)=0.5 kW/m^(2);78.8 and 43.9%at P_(5)=14 MPa;63.86 and 35.57%at T5=650 K;74.84 and 41.69%at&mSCO 7kg s;2=/85.83 and 47.82%at T_(9)=300 K;84.57 and 47.11%at HTR 65;=0.85.06 and 47.38%at LTR 65,=0.respectively.Alternatively,R290 showed the minimum value of exergy and thermal efficiency.As can be seen,the maximum amount of exergy destruction or exergy loss occurs in a solar collector field,~58.25%of the total exergy destruction rate(i.e.6703 kW)and 18.99%of the solar inlet exergy(i.e.20562 kJ).Moreover,R123 has the highest net work output,~4594 kJ at T5=650 K and 6176 kJ at T_(9)=300 K.
基金supported by the National Natural Science Foundation of China(No.50776076)the Doctoral Fund of the Ministry of Education of China(No.20110101110022)the National Funds for Distinguished Young Scientists of China(No.50825601)
基金Project supported by the National Natural Science Foundation of China(No.51106071)the Priority Academic Program Development of Jiangsu Higher Education Institutions,China
