Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610855
Yong Liul, Fan Fei, K. See, Xiong Liu, Ziyou Lim, R. Simanjorang, J. Pou, A. Gupta, J. Lai
In this paper, one single leg T-type converter with full silicon carbide (SiC) half-bridge power modules and hybrid power modules combined silicon carbide (SiC) with silicon (Si) power module, are designed and investigated. Firstly, the switching characteristics of Cree SiC device CAS300M12BM2 and Semikron SiC device SKM350MB120SCH17 single-leg T-Type converters are compared with double pulse testing (DPT). Then, to further investigate the performance, the hybrid power modules of the single leg T-type converter with Cree SiC device CAS300M12BM2 and Semikron Si device SKM300GM12T4 are built, which can increases the power density, compared to the full SiC devices T-type converter. To suppress the ringing of the middle leg switching device, the resistor-capacitor (RC) snubber are designed and demonstrated with DPT. Finally, the function testing of the hybrid single leg T-type converter are experimentally verified.
{"title":"Switching Devices Comparison and RC Snubber for Ringing Suppression in one Single Leg T-type Converter","authors":"Yong Liul, Fan Fei, K. See, Xiong Liu, Ziyou Lim, R. Simanjorang, J. Pou, A. Gupta, J. Lai","doi":"10.1109/ACEPT.2018.8610855","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610855","url":null,"abstract":"In this paper, one single leg T-type converter with full silicon carbide (SiC) half-bridge power modules and hybrid power modules combined silicon carbide (SiC) with silicon (Si) power module, are designed and investigated. Firstly, the switching characteristics of Cree SiC device CAS300M12BM2 and Semikron SiC device SKM350MB120SCH17 single-leg T-Type converters are compared with double pulse testing (DPT). Then, to further investigate the performance, the hybrid power modules of the single leg T-type converter with Cree SiC device CAS300M12BM2 and Semikron Si device SKM300GM12T4 are built, which can increases the power density, compared to the full SiC devices T-type converter. To suppress the ringing of the middle leg switching device, the resistor-capacitor (RC) snubber are designed and demonstrated with DPT. Finally, the function testing of the hybrid single leg T-type converter are experimentally verified.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116858000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610869
D. Ramasubbu, Krishnamoorthy Baskaran, Grynberg Yann
“Only 44 percent of computers, 32 percent of monitors, and 25 percent of printers were turned off at night” [1], with energy efficient appliances employed in office environments, occupant’s energy-conscious behavior plays a vital role in monitoring the plug load. In an attempt to involve the occupants to the building’s energy management suite, a natural language-based plug management system is proposed. This article aims to develop a rule-based chatbot that helps users manage (schedule) their plugged-in appliances through smart plugs in an office environment. Considering the nature of the application and the accuracy of the intended operation, a rule-based chatbot is developed to schedule the smart plugs. It is developed using Python to be integrated with instant messaging application Slack.
{"title":"Intrusive Plug Management System Using Chatbots in Office Environments","authors":"D. Ramasubbu, Krishnamoorthy Baskaran, Grynberg Yann","doi":"10.1109/ACEPT.2018.8610869","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610869","url":null,"abstract":"“Only 44 percent of computers, 32 percent of monitors, and 25 percent of printers were turned off at night” [1], with energy efficient appliances employed in office environments, occupant’s energy-conscious behavior plays a vital role in monitoring the plug load. In an attempt to involve the occupants to the building’s energy management suite, a natural language-based plug management system is proposed. This article aims to develop a rule-based chatbot that helps users manage (schedule) their plugged-in appliances through smart plugs in an office environment. Considering the nature of the application and the accuracy of the intended operation, a rule-based chatbot is developed to schedule the smart plugs. It is developed using Python to be integrated with instant messaging application Slack.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115559422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610818
Xiaoqiong He, Pengcheng Han, M. Zhu, Shibin Gao, Xiaoqiong He, Shibin Gao, Wang Peng
In order to solve the problems of neutral section and power quality in traction power supply system, a novel traction power supply system based on MMC (Modular Multilevel Converter, MMC) structure is proposed in this paper. The system takes electricity from the three-phase power grid, connects to the three-phase MMC rectifier through the connected transformer, and converts it into a single-phase high-voltage alternating current through HVDC (high-voltage direct current, HVDC) transmission and single-phase MMC inverters. Each substation supplies the traction network with 27.5kV singlephase alternating current with the same output phase through the single-phase step-down transformer of the same ratio to realize the advanced co-phase power supply. This paper verifies the correctness and feasibility of the system through simulation and building a low-power experimental platform.
为了解决牵引供电系统中性点区段和电能质量问题，提出了一种基于MMC (Modular multi - level Converter, MMC)结构的新型牵引供电系统。系统从三相电网取电，通过连接的变压器与三相MMC整流器连接，通过HVDC (high voltage direct current, HVDC)传输和单相MMC逆变器将其转换成单相高压交流电。各变电站通过相同比例的单相降压变压器向牵引网络提供输出相相同的27.5kV单相交流电，实现先进的共相供电。本文通过仿真和搭建低功耗实验平台验证了该系统的正确性和可行性。
{"title":"Advanced Traction Power Supply System Based on Modular Multilevel Converters","authors":"Xiaoqiong He, Pengcheng Han, M. Zhu, Shibin Gao, Xiaoqiong He, Shibin Gao, Wang Peng","doi":"10.1109/ACEPT.2018.8610818","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610818","url":null,"abstract":"In order to solve the problems of neutral section and power quality in traction power supply system, a novel traction power supply system based on MMC (Modular Multilevel Converter, MMC) structure is proposed in this paper. The system takes electricity from the three-phase power grid, connects to the three-phase MMC rectifier through the connected transformer, and converts it into a single-phase high-voltage alternating current through HVDC (high-voltage direct current, HVDC) transmission and single-phase MMC inverters. Each substation supplies the traction network with 27.5kV singlephase alternating current with the same output phase through the single-phase step-down transformer of the same ratio to realize the advanced co-phase power supply. This paper verifies the correctness and feasibility of the system through simulation and building a low-power experimental platform.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114463712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610743
Zhenwei Li, Xu Yang, Yang Li, Naizeng Wang, Shuai Zhang, Hui Chen, Ji Ma
Eelectric Vehicles $(EV_{s})$ have developed fastly supported by governments to relieve pollution issues and energy crisis in recent years. However, with the continuous devlopment of $EV_{s}$, efficient and rapid charging will restrict its further development. So a kind of charging module which owns high-output power and high-efficiency is a feasible key to solve the charging problem. However, conventional charging modules with using Silicon (Si) devices couldn’t realize very high efficiency, as a lot of power losses caused by power semiconductors and magnetic devices. So reducing power loss of these devices is a useful way to realize very high efficiency. Hence, this paper plans to design a 15kW DC/DC converter with LLC topology and Silicon-Carbide (SiC) devices to reduce power loss and verify its high efficiency. The proposed converter could reach about 98.4% and higher about 3% than conventional converter at rated full-load condition. Power density and volume of this proposed converter increases 27.6% and decreases 21.9% than conventional converter, respectively. Other detailed comparison information about this two converters shown as Part-D of section-II in this paper. In the end, relaive experimental waveforms used to verify the correctness and rationality of design.
{"title":"A High-efficiency DC/DC Converter with SiC Devices and LLC topology for Charging Electric Vehicles","authors":"Zhenwei Li, Xu Yang, Yang Li, Naizeng Wang, Shuai Zhang, Hui Chen, Ji Ma","doi":"10.1109/ACEPT.2018.8610743","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610743","url":null,"abstract":"Eelectric Vehicles $(EV_{s})$ have developed fastly supported by governments to relieve pollution issues and energy crisis in recent years. However, with the continuous devlopment of $EV_{s}$, efficient and rapid charging will restrict its further development. So a kind of charging module which owns high-output power and high-efficiency is a feasible key to solve the charging problem. However, conventional charging modules with using Silicon (Si) devices couldn’t realize very high efficiency, as a lot of power losses caused by power semiconductors and magnetic devices. So reducing power loss of these devices is a useful way to realize very high efficiency. Hence, this paper plans to design a 15kW DC/DC converter with LLC topology and Silicon-Carbide (SiC) devices to reduce power loss and verify its high efficiency. The proposed converter could reach about 98.4% and higher about 3% than conventional converter at rated full-load condition. Power density and volume of this proposed converter increases 27.6% and decreases 21.9% than conventional converter, respectively. Other detailed comparison information about this two converters shown as Part-D of section-II in this paper. In the end, relaive experimental waveforms used to verify the correctness and rationality of design.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133997776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610746
Yuge Sun, Chuanlin Zhang, Pengfeng Lin
A composite control approach to realize the exact speed trajectory tracking for the single shaft Micro-Turbine (MT) system is presented in this paper. The composite controller is developed by integrating a higher-order sliding mode observer and a feedback domination technique. By means of the proposed method, asymptotic stability of the MT system can be ensured even in the presence of mismatched disturbances. At last, by numerical simulations, we illustrate that how this promising composite controller is feasible for the practical nonlinear MT system to realize the exact tracking, rather than a practical tracking objective.
{"title":"Precise Regulation for Micro-Turbine in a Microgrid via Higher Order Sliding Modes and Domination Control Approach","authors":"Yuge Sun, Chuanlin Zhang, Pengfeng Lin","doi":"10.1109/ACEPT.2018.8610746","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610746","url":null,"abstract":"A composite control approach to realize the exact speed trajectory tracking for the single shaft Micro-Turbine (MT) system is presented in this paper. The composite controller is developed by integrating a higher-order sliding mode observer and a feedback domination technique. By means of the proposed method, asymptotic stability of the MT system can be ensured even in the presence of mismatched disturbances. At last, by numerical simulations, we illustrate that how this promising composite controller is feasible for the practical nonlinear MT system to realize the exact tracking, rather than a practical tracking objective.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128585714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610831
Jatin Verma, Donghan Shi, Koh Leong Hai, Ong Hueh Chuah, C. Dong, Xia Yang, Xu Yan
Solar PV is renowned all around the world, but its prevalence varies with a country’s solar profile. Singapore is an island country which has limited potential towards various renewable options. On the UN’s request to submit the Intended Nationally Determined Contribution (INDC) against carbon emissions, Singapore, as a promoter of efficient energy, has come up with an elaborate Climate Action Plan towards carbon emission reduction. Solar PV is the most promising renewable energy option for the country. An aspiring leap towards 350MWp PV capacity by 2020 is on trial, which would involve numerous PV installation projects. The project on installing PV with Energy Storage System (ESS) in Jurong Port (JP) distribution grid is one of them. This paper proposes a 3.3MWp PV installation in the low voltage side of the JP distribution grid by providing comprehensive steady-state analyses in different loading scenarios. Comparison among different configurations of PV and ESS is done and it is found that the PV could reduce line congestions and circumvent substantial transmission losses. Also, during light loading, it sends surplus power back to the grid.
{"title":"Impact Study for PV and ESS integration in Jurong Port Distribution Grid","authors":"Jatin Verma, Donghan Shi, Koh Leong Hai, Ong Hueh Chuah, C. Dong, Xia Yang, Xu Yan","doi":"10.1109/ACEPT.2018.8610831","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610831","url":null,"abstract":"Solar PV is renowned all around the world, but its prevalence varies with a country’s solar profile. Singapore is an island country which has limited potential towards various renewable options. On the UN’s request to submit the Intended Nationally Determined Contribution (INDC) against carbon emissions, Singapore, as a promoter of efficient energy, has come up with an elaborate Climate Action Plan towards carbon emission reduction. Solar PV is the most promising renewable energy option for the country. An aspiring leap towards 350MWp PV capacity by 2020 is on trial, which would involve numerous PV installation projects. The project on installing PV with Energy Storage System (ESS) in Jurong Port (JP) distribution grid is one of them. This paper proposes a 3.3MWp PV installation in the low voltage side of the JP distribution grid by providing comprehensive steady-state analyses in different loading scenarios. Comparison among different configurations of PV and ESS is done and it is found that the PV could reduce line congestions and circumvent substantial transmission losses. Also, during light loading, it sends surplus power back to the grid.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133829851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610870
Yuqiong Zhang, Jiale Liu, Huizhi Zhou, Ke Guo, Fei Tang
Multiple types of renewable distributed generation (RDG) connecting to the distribution network brings randomness to power system, which have effects on voltage stability and losses of distribution system. However, the traditional distribution planning methods cannot give consideration to both RDG capacity and installation position under various load levels. This paper proposed a fireworks optimization algorithm to obtain optimal reconfiguration of radial distribution systems with the smallest network loss (active power loss) and the maximum voltage support effect simultaneously. This algorithm can reconstruct the network and take the different RDG capacities and installation sites into overall plan. Firstly, the mathematical probability models on wind power and photovoltaic cell are established in order to consider the uncertainty of RDG. Secondly, the network switch combination added with different RDG capacities and locations are regarded as variables introduced into the fireworks algorithm. Under the consideration of various RDG operation scenarios and different load levels, the optimal sizes and positions of RDG in optimal distribution system structure can be searched by the algorithm finally. The simulation results in PE& G 69-bus system indicate the proposed method can satisfy the constraints of stable operation. In comparison of the planning only consider RDG capacities or just RDG positions, its economical superiority is well verified.
{"title":"Intelligent Reconfiguration for Distributed Power Network with Multivariable Renewable Generation","authors":"Yuqiong Zhang, Jiale Liu, Huizhi Zhou, Ke Guo, Fei Tang","doi":"10.1109/ACEPT.2018.8610870","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610870","url":null,"abstract":"Multiple types of renewable distributed generation (RDG) connecting to the distribution network brings randomness to power system, which have effects on voltage stability and losses of distribution system. However, the traditional distribution planning methods cannot give consideration to both RDG capacity and installation position under various load levels. This paper proposed a fireworks optimization algorithm to obtain optimal reconfiguration of radial distribution systems with the smallest network loss (active power loss) and the maximum voltage support effect simultaneously. This algorithm can reconstruct the network and take the different RDG capacities and installation sites into overall plan. Firstly, the mathematical probability models on wind power and photovoltaic cell are established in order to consider the uncertainty of RDG. Secondly, the network switch combination added with different RDG capacities and locations are regarded as variables introduced into the fireworks algorithm. Under the consideration of various RDG operation scenarios and different load levels, the optimal sizes and positions of RDG in optimal distribution system structure can be searched by the algorithm finally. The simulation results in PE& G 69-bus system indicate the proposed method can satisfy the constraints of stable operation. In comparison of the planning only consider RDG capacities or just RDG positions, its economical superiority is well verified.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129651457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610873
P. Acuña, R. Aguilera, B. Mcgrath, P. Lezana, A. Ghias, J. Pou
This paper proposes a sequential Phase-Shifted Model Predictive Control (PS-MPC) strategy for a single-phase five-level H-bridge flying capacitor converter. The optimal control problem is formulated to regulate the output current and both of the internal floating capacitor voltages. The proposed sequential PS-MPC strategy achieves a fixed switching frequency, which is beneficial in terms semiconductor loss distribution, and also to ensure that a high-bandwidth is achieved that compares favorably to the finite-control-set MPC (FCS-MPC) case. Simulation results of the proposed sequential PS-MPC strategy, providing current tracking control for a passive load, are presented to verify the transient and steady-state performance that can be achieved.
{"title":"Sequential Phase-Shifted Model Predictive Control for a Single-Phase Five-Level H-bridge Flying Capacitor Converter","authors":"P. Acuña, R. Aguilera, B. Mcgrath, P. Lezana, A. Ghias, J. Pou","doi":"10.1109/ACEPT.2018.8610873","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610873","url":null,"abstract":"This paper proposes a sequential Phase-Shifted Model Predictive Control (PS-MPC) strategy for a single-phase five-level H-bridge flying capacitor converter. The optimal control problem is formulated to regulate the output current and both of the internal floating capacitor voltages. The proposed sequential PS-MPC strategy achieves a fixed switching frequency, which is beneficial in terms semiconductor loss distribution, and also to ensure that a high-bandwidth is achieved that compares favorably to the finite-control-set MPC (FCS-MPC) case. Simulation results of the proposed sequential PS-MPC strategy, providing current tracking control for a passive load, are presented to verify the transient and steady-state performance that can be achieved.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129308100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610660
Shih-Hao Kuo, Zheng-An Lin, Yi-Hua Liu, Y. Hsieh, H. Chiu
In this paper, a stand-alone single-phase diode-clamped five-level inverter is studied and implemented. This prototype circuit makes the input voltage shared by series-connected switching devices. Besides, this topology needs clamped diodes to clamp the voltage on the MOSFETs. On the other hand, the control signals of the power devices are generated by sinusoidal pulse-width-modulation (SPWM). The desired output voltage can be modulated by the amplitude modulation index. The circuit operation naturally causes the input capacitor voltages unbalance. Accordingly, a switched-capacitor charge equalization technique is implemented to solve the imbalance problem.A prototype circuit with the switched-capacitor equalizer has been built and tested successfully in this paper. The circuit is with rated power of 630 W, 800 V input voltage, and 230 V output voltage. A digital-signal processor chip is used to realize the controller of this inverter. The measured efficiency is always higher than 90% within the overall range of load conditions.
{"title":"Study and Implementation of a Single-Phase Diode- Clamped Five-Level Inverter with Auto Equalization","authors":"Shih-Hao Kuo, Zheng-An Lin, Yi-Hua Liu, Y. Hsieh, H. Chiu","doi":"10.1109/ACEPT.2018.8610660","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610660","url":null,"abstract":"In this paper, a stand-alone single-phase diode-clamped five-level inverter is studied and implemented. This prototype circuit makes the input voltage shared by series-connected switching devices. Besides, this topology needs clamped diodes to clamp the voltage on the MOSFETs. On the other hand, the control signals of the power devices are generated by sinusoidal pulse-width-modulation (SPWM). The desired output voltage can be modulated by the amplitude modulation index. The circuit operation naturally causes the input capacitor voltages unbalance. Accordingly, a switched-capacitor charge equalization technique is implemented to solve the imbalance problem.A prototype circuit with the switched-capacitor equalizer has been built and tested successfully in this paper. The circuit is with rated power of 630 W, 800 V input voltage, and 230 V output voltage. A digital-signal processor chip is used to realize the controller of this inverter. The measured efficiency is always higher than 90% within the overall range of load conditions.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124051245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610693
C. Dong, Qian Xiao, L. Koh, H. Jia, Xiaonan Liu, Peng Wang
As a promising topology, modular multilevel converters (MMCs) are widely deployed for high voltage direct current (HVDC) systems. To directly calculate the equilibrium point of MMC-HVDC, this paper establishes the system model considering the dynamics of the capacitor voltages, the output current and the circulating current. The established model is then analyzed to exhibit the interactions between the state and the control variables. Without simulations, a trust-region algorithm is proposed to determine the equilibrium point of the MMC-HVDC system, which decreases the time cost compared with the simulation. For the verification of developed method, an MMC-HVDC system is tested. The results demonstrate that the derived model and the proposed algorithm can provide accurate equilibrium point with high efficiency. On the basis of the developed algorithm, the model and parameter impacts are also analyzed.
{"title":"Equilibrium Point Analysis for the MMC-HVDC System with Trust-region Algorithm","authors":"C. Dong, Qian Xiao, L. Koh, H. Jia, Xiaonan Liu, Peng Wang","doi":"10.1109/ACEPT.2018.8610693","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610693","url":null,"abstract":"As a promising topology, modular multilevel converters (MMCs) are widely deployed for high voltage direct current (HVDC) systems. To directly calculate the equilibrium point of MMC-HVDC, this paper establishes the system model considering the dynamics of the capacitor voltages, the output current and the circulating current. The established model is then analyzed to exhibit the interactions between the state and the control variables. Without simulations, a trust-region algorithm is proposed to determine the equilibrium point of the MMC-HVDC system, which decreases the time cost compared with the simulation. For the verification of developed method, an MMC-HVDC system is tested. The results demonstrate that the derived model and the proposed algorithm can provide accurate equilibrium point with high efficiency. On the basis of the developed algorithm, the model and parameter impacts are also analyzed.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125335236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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