{"title":"Comparative Study of Isolated and Symmetrical Bidirectional DC-DC Converters based on Flyback and Forward Topologies","authors":"N. M. Mukhtar, D. Lu","doi":"10.1109/IFEEC47410.2019.9014922","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9014922","url":null,"abstract":"This paper presents a comparative study of isolated and symmetrical bidirectional dc-dc converters based on flyback and forward topologies. It covers those converters with dissipative and non-dissipative snubbers, active clamped switches and two- switch configuration. The parameters used for this study include conversion efficiency, component count, component stress and gate driving requirements. It is found that some structures produce high circulation current which should be avoided. The study has identified two promising converter structures which eliminate the problems and produce high efficiency with reasonable component count.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132979500","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}
Feixue Chen, Chi Zhang, Jin-hua Chen, Jie Zhang, Mengfei Wei, Chenxia Xu, Guilin Yang
{"title":"A Double-Sided Flat Permanent Magnet Linear Motor with Dual Halbach for Free-Piston Linear Generator","authors":"Feixue Chen, Chi Zhang, Jin-hua Chen, Jie Zhang, Mengfei Wei, Chenxia Xu, Guilin Yang","doi":"10.1109/IFEEC47410.2019.9014682","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9014682","url":null,"abstract":"Free-piston linear generator (FPLG) is regarded as a promising power generator system for hybrid electric vehicle. The core component of FPLG, linear motor, requires careful design to match the system performances. In this paper, for required performance, a novel double-sided flat permanent magnet linear motor with dual Halbach is proposed. This motor is composed of four modular unit stators on both sides of the mover. Fractional-slot (7-poles/6-slot) and concentrated windings are adopted to each unit for high power, low thrust ripple. The relationship between the linear motor performance and structure parameters is developed and applied to design the size of linear motor. To verify the design of this motor, the two-dimensional finite-element model is established. The feature of output power in motoring and generating model are analyzed. In addition, a prototype is developed and tested in an experimental platform, which consists of rotating electrical machine and crankshaft connecting rod system. In terms of system output power, the experimental data is in well agreement with the finite-element results.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133326981","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}
{"title":"Heat Dissipation System Modeling of Three-level Converter Considering Thermal Coupling Effects","authors":"Qiang Wang, Fengyou He, Xiaofei Zhou, Chengfei Geng, Weifeng Zhang","doi":"10.1109/IFEEC47410.2019.9014927","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9014927","url":null,"abstract":"The heat dissipation problem is the key to restrict the capacity and reliability of high-power converters. In this paper, aiming at the air-cooled heat dissipation system of high-power neutral-point clamped (NPC) three-level converter with specific radiator structure, the thermal impedance parameters are extracted by using finite-element method (FEM), and the overall three-dimensional (3-D) coupling thermal network model of the converter is thereby established. Both the thermal coupling effects between different power device chips and between different insulated gate bipolar transistor (IGBT) modules are comprehensively considered. The proposed thermal model can truly reflect the junction temperature of each chip in IGBT module and accurately estimate the detailed temperature in the critical locations of high-power converter, which is of vital importance to the device selection, heat dissipation design, reliability evaluation and life prediction of high-power converter.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128002050","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}
{"title":"High Gain Module Integrated Converter Combating Partial Shading on PV Panel","authors":"Vandana Arora, V. Verma","doi":"10.1109/IFEEC47410.2019.9015128","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9015128","url":null,"abstract":"Modular, environment-friendly, low maintenance and cost effective converter fed off-grid power solution utilizing PV and battery for Telecom power supply is a requisite. This paper proposes a module integrated converter system which does the MPPT and also boosts the voltage upto usable value under various conditions of insolation variation and partial shading conditions. The current control scheme evacuates the maximum power during PV generation amidst intermittent conditions presents a slave source to a battery fed nanogrid. The performance of the system is evaluated under Matlab/Simulink environment. Presented simulation results show close conformity with design and validates the effectiveness of the system proposed.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121389669","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}
{"title":"Electro-Thermal Modeling of a Boost Converter Considering Device Self-heating","authors":"T. Cheng, D. Lu, Y. Siwakoti","doi":"10.1109/IFEEC47410.2019.9014948","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9014948","url":null,"abstract":"Thermal management is one of the most critical aspects of the design of high power density converters. Recently, significant efforts and progress have been made in developing electro-thermal models for power semiconductor devices as they are very sensitive to temperature changes. Passive components such as inductors and capacitors are also investigated, since they are temperature-dependent. However, most published work focuses on electro-thermal model of a single power device or a module only instead of a whole converter, which is more realistic in terms of converter design. Hence, in this work, a datasheet informed electro-thermal model is proposed for a boost converter. It is achieved by adding additional behavior models to the existing electrical model of each power device to reflect the temperature incurred electrical behavioral change. Loss model and RC network are used to estimate the temperature change. This forms a power loss and temperature feedback loop. The advantages of this work are ease of integration with existing electrical models in the SPICE library, and elimination of the complicated physical properties of the power devices, but fully utilizes the device datasheet information and mathematical method.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115969161","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}
{"title":"Eliminating The Problem of Trapping in Local Maximum Power Point under Partial Shading Conditions for PV System","authors":"Chang-Hua Lin, Hwa-Dong Liu, Chien-Ming Wang","doi":"10.1109/IFEEC47410.2019.9015150","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9015150","url":null,"abstract":"This study realizes a new solar-power generation system that can complete the global maximum power point tracking (GMPPT) control under uniform irradiation and partial shading conditions (UIC and PSC, respectively). The MCU of the proposed system calculates the IGMPP of the photovoltaic (PV) module to accurately execute GMPPT on the basis of the PV module current (Ipv), power (Ppv) and temperature trend line slope (dIpv/dPpv). The microcontroller unit can then confirm whether the PV module suffers from shading according to the slope (dIpv/dPpv) and immediately executes the PSC mode control strategy to calculate the VGMPP of the PV module, thereby accurately tracking the GMPP. The proposed algorithm is compared with the existing methods. Such model is then practically experimented from the irradiance levels of 1000 W/m2 and under PSC. Experimental results confirm that the performance of the algorithm is better than those of the traditional hill-climbing algorithm and perturbation and observation methods.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116900761","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}
{"title":"An active cell-to-cell balancing circuit with planar coupled inductors for series connected batteries","authors":"Wei Yang, Jiye Han, Xiaofang Liu, Shiyan Yang","doi":"10.1109/IFEEC47410.2019.9014977","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9014977","url":null,"abstract":"The active cell-to-cell equalizers can achieve energy transfer between two cells, which may be an effective equalization method in some battery applications. This paper proposes a new direct cell-to-cell active equalizer using planar coupled inductors. The new circuit allows the energy to transfer directly between any two cells by fly-back operation or Buck-Boost operation which gives a short balancing path and guarantees a fast equalization speed. The planar coupled inductors are adopted for high power density. The results of balancing test with a six-20Ah Lithium-ion battery string show the validity of the circuit.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117301469","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}
Tomoyuki Mannen, D. Yamaguchi, K. Wada, H. Obara, T. Sai, K. Miyazaki, M. Takamiya, T. Sakurai
{"title":"Effect on Digital Active Gate Control of a Practical IGBT Full-Bridge Inverter with the Additional DC-Link Capacitor Close to Power Devices","authors":"Tomoyuki Mannen, D. Yamaguchi, K. Wada, H. Obara, T. Sai, K. Miyazaki, M. Takamiya, T. Sakurai","doi":"10.1109/IFEEC47410.2019.9014996","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9014996","url":null,"abstract":"This paper proposes and evaluates an active gate control method of switching waveform design with digital gate drivers for a practical full-bridge inverter equipped with additional dc-link capacitors. The full-bridge inverter employs 1700-V, 150-A IGBT power modules and has a practical circuit layout with additional capacitors. The experimental system has a capability of optimizing driving patterns for shaping the designed switching waveform. In experimental verification, active gate control can suppress the surge voltage from 70% to 10% with 30% lower switching loss in three different circuit layout of the proposed practical 50-kVA full-bridge inverter. As a result, this paper reveals that active gate control achieves reduction in effect of stray inductance and increases a freedom of the circuit layout in power converters.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117138859","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}
{"title":"Research on Adaptive Direct Torque Control Based on Online Parameter Estimation Applied to Surface Permanent Magnet Motor","authors":"Lon-Jay Cheng, I-Hsuan Wu, M. Tsai","doi":"10.1109/IFEEC47410.2019.9015012","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9015012","url":null,"abstract":"This paper proposed an online motor parameter estimation method to improve performance of direct torque control based on model prediction approach. The proposed parameter estimation adopts Popov's Hyper Stability Theorem to estimate accurate motor parameters, such as stator resistance, stator inductance and rotor flux linkage, which are critical for torque and flux estimation. The parameter estimation method is verified by a hardware in the loop emulation platform and thus proves the feasibility of the proposed method.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115372674","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}
Shih-Hao Kuo, Chien-Chun Huang, Li-Shiun Tsai, H. Chiu
{"title":"Research on Symmetrical LLC Converter Applied to DC Transformer","authors":"Shih-Hao Kuo, Chien-Chun Huang, Li-Shiun Tsai, H. Chiu","doi":"10.1109/IFEEC47410.2019.9014984","DOIUrl":"https://doi.org/10.1109/IFEEC47410.2019.9014984","url":null,"abstract":"This paper analyzes the advantages of asymmetric LLC converter applied to a bidirectional DC transformer. The symmetric LLC converter has the same voltage gain curve in the forward and reverses directions due to the symmetry of the resonant tank, and its voltage gain is one at the first resonant frequency. Through the reverse current generated by the transformer's magnetizing inductance and the external inductor, although the switching frequency sets the first resonant frequency, the primary and secondary switches can achieve zero voltage switching under any load conditions. The controller only needs to use the open loop circuit to synchronize the switching signals of the primary side and the secondary side to complete the automatic bidirectional power flow action, which has the advantage of the simple control. This paper analyzes the above advantages by theory and verifies the correctness of the arguments by simulation and implementation. The implementation of an 18kW prototype symmetric LLC bidirectional DC transformer as a verification, its efficiency performance is more than 97%.","PeriodicalId":230939,"journal":{"name":"2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127005692","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}