Pub Date : 2016-12-01DOI: 10.1109/SPEC.2016.7846134
Liping Wang, A. Romagnoli
There has been great interest on exploring the potential of waste heat extraction using thermoelectric generator (TEG) system on marine application, due to great amount of exhaust gas volume, many potential locations with consistent high temperature and availability of infinite cooling sea water. To improve the overall output performance of TEG system in terms of efficiency, proper system level engineering and integration have been considered crucial besides development of thermoelectric materials with larger ZT (figure of merit) value and optimal control strategy of electrical interface system. In this work, preliminary experimental investigation and numerical modelling optimization on the cooling system for a thermoelectric module level device are conducted. The predicted open-circuit voltages by thermoelectric simulation for device with conventional tubed water cooling plate are in good agreement with the measured experimental data for various hot exhaust temperatures. The model is then revised for further simulation to optimize the cooling plate design by examining detailed thermal performance and electrical current-voltage characteristics for the thermoelectric module device with varying electrical load. These investigations demonstrate that a local effective cooling system is important for high efficiency TEG implementation. This modulelevel observation serves to perceive how TEG system integrates as well as indicate potential improvement for TEG power conversion system. With good accuracy, the employed simulation tool is capable of rapidly characterizing TEG system level performance in future work.
{"title":"Cooling system investigation of thermoelectric generator used for marine waste heat recovery","authors":"Liping Wang, A. Romagnoli","doi":"10.1109/SPEC.2016.7846134","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7846134","url":null,"abstract":"There has been great interest on exploring the potential of waste heat extraction using thermoelectric generator (TEG) system on marine application, due to great amount of exhaust gas volume, many potential locations with consistent high temperature and availability of infinite cooling sea water. To improve the overall output performance of TEG system in terms of efficiency, proper system level engineering and integration have been considered crucial besides development of thermoelectric materials with larger ZT (figure of merit) value and optimal control strategy of electrical interface system. In this work, preliminary experimental investigation and numerical modelling optimization on the cooling system for a thermoelectric module level device are conducted. The predicted open-circuit voltages by thermoelectric simulation for device with conventional tubed water cooling plate are in good agreement with the measured experimental data for various hot exhaust temperatures. The model is then revised for further simulation to optimize the cooling plate design by examining detailed thermal performance and electrical current-voltage characteristics for the thermoelectric module device with varying electrical load. These investigations demonstrate that a local effective cooling system is important for high efficiency TEG implementation. This modulelevel observation serves to perceive how TEG system integrates as well as indicate potential improvement for TEG power conversion system. With good accuracy, the employed simulation tool is capable of rapidly characterizing TEG system level performance in future work.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129028339","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 : 2016-12-01DOI: 10.1109/SPEC.2016.7846166
Tsegay Hailu, L. Mackay, M. Gajić, J. Ferreira
Distributed Generation has created the need for new types of smart dc grids developments. The multiple generation sources, bi-directional power flow, power flow time co-ordination and management bring significant benefits as well as challenges for current ac electrical grids and emerging dc microgrids. In particular, the effect of voltage weak distribution systems on protection concepts and approaches needs to be understood, investigated, and accounted for. This paper describes principles of protection of voltage weak dc grid concepts. New alternative protection designs are proposed and their benefits and challenges are discussed. Likewise, special circuit configurations are proposed to improve fault discrimination. Fault-induced voltage transients are used to detect and isolate faulty part of the dc distribution grid.
{"title":"Protection coordination of voltage weak DC distribution grid: Concepts","authors":"Tsegay Hailu, L. Mackay, M. Gajić, J. Ferreira","doi":"10.1109/SPEC.2016.7846166","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7846166","url":null,"abstract":"Distributed Generation has created the need for new types of smart dc grids developments. The multiple generation sources, bi-directional power flow, power flow time co-ordination and management bring significant benefits as well as challenges for current ac electrical grids and emerging dc microgrids. In particular, the effect of voltage weak distribution systems on protection concepts and approaches needs to be understood, investigated, and accounted for. This paper describes principles of protection of voltage weak dc grid concepts. New alternative protection designs are proposed and their benefits and challenges are discussed. Likewise, special circuit configurations are proposed to improve fault discrimination. Fault-induced voltage transients are used to detect and isolate faulty part of the dc distribution grid.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130826233","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 : 2016-12-01DOI: 10.1109/SPEC.2016.7846107
K. Sun, T. Summers, C. Coates
The Ironless Axial Flux Permanent Magnet (IAFPM) machine, also referred to as air-cored or coreless machine is a variant of the AFPM machine with the iron removed from the stator. This allows the efficiency and power density of the machine to be further improved [1]-[4]. However, IAFPM motors generally have very low inductance (< 50μH) due to their ironless nature [5], which increases the design complexity of the drive system as the motor currents becomes difficult to control. If neglected, the large current ripple will produce significant torque ripple. The Multilevel Cascaded H-bridge (MLCHB) converter topology could potentially address this issue. This paper first provides an analysis of the IAFPM motor characteristics and control method, then it provides a review of topologies currently used to control IAFPM motors. Lastly the application of a MLCHB converter for the control of low inductance motors is introduced. Simulation results of an IAFPM motor with 5μH line inductance driven by a MLCHB converter are presented with comparisons made to existing strategies.
{"title":"Ironless axial flux permanent magnet motor control with multilevel cascaded H-bridge converter for electric vehicle applications","authors":"K. Sun, T. Summers, C. Coates","doi":"10.1109/SPEC.2016.7846107","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7846107","url":null,"abstract":"The Ironless Axial Flux Permanent Magnet (IAFPM) machine, also referred to as air-cored or coreless machine is a variant of the AFPM machine with the iron removed from the stator. This allows the efficiency and power density of the machine to be further improved [1]-[4]. However, IAFPM motors generally have very low inductance (< 50μH) due to their ironless nature [5], which increases the design complexity of the drive system as the motor currents becomes difficult to control. If neglected, the large current ripple will produce significant torque ripple. The Multilevel Cascaded H-bridge (MLCHB) converter topology could potentially address this issue. This paper first provides an analysis of the IAFPM motor characteristics and control method, then it provides a review of topologies currently used to control IAFPM motors. Lastly the application of a MLCHB converter for the control of low inductance motors is introduced. Simulation results of an IAFPM motor with 5μH line inductance driven by a MLCHB converter are presented with comparisons made to existing strategies.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130943686","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 : 2016-12-01DOI: 10.1109/SPEC.2016.7846176
W. Rodrigues, R. A. S. Santana, A. P. L. Cota, T. R. Oliveira, L. M. F. Morais, P. Cortizo
This paper investigates a Solid State Transformer (SST) based DC microgrid architecture, addressing the design and control of the multiple SST power conversion stages and the power management strategy required for its integration with other microgrid elements, such as storage devices and local distributed generation. The advantages of a SST in relation to conventional low frequency transformers are commonly listed as a substantial reduction of volume and weight, fault isolation capability, voltage regulation, harmonic filtering, reactive power compensation and power factor correction. The SST also constitutes the required infrastructure that will enable DC power distribution to homes and commercial buildings in the near future and provides a more efficient way to integrate storage devices and distributed generation into the electrical grid. In this sense the SST behaves as an energy router, which represents a key element in an intelligent power system. The behavior of the proposed architecture for different operating conditions and disturbances will be assessed through computational simulations in the software MATLAB/Simulink.
{"title":"Integration of solid state transformer with DC microgrid system","authors":"W. Rodrigues, R. A. S. Santana, A. P. L. Cota, T. R. Oliveira, L. M. F. Morais, P. Cortizo","doi":"10.1109/SPEC.2016.7846176","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7846176","url":null,"abstract":"This paper investigates a Solid State Transformer (SST) based DC microgrid architecture, addressing the design and control of the multiple SST power conversion stages and the power management strategy required for its integration with other microgrid elements, such as storage devices and local distributed generation. The advantages of a SST in relation to conventional low frequency transformers are commonly listed as a substantial reduction of volume and weight, fault isolation capability, voltage regulation, harmonic filtering, reactive power compensation and power factor correction. The SST also constitutes the required infrastructure that will enable DC power distribution to homes and commercial buildings in the near future and provides a more efficient way to integrate storage devices and distributed generation into the electrical grid. In this sense the SST behaves as an energy router, which represents a key element in an intelligent power system. The behavior of the proposed architecture for different operating conditions and disturbances will be assessed through computational simulations in the software MATLAB/Simulink.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121035752","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 : 2016-12-01DOI: 10.1109/SPEC.2016.7846009
Jiancheng Song, Shunqian Song, Bingni Qu
Nonlinear inductance profiles of switched reluctance motor (SRM) cause the complicated design of controllers, which leads to SRMs have not been widely applied in industries fileds. A traditional PI controller with fixed gain is easy to realize the control of SRMs. It can not provide good control performance over the whole range of speed regulation. To solve the problem, an adaptive PI controller of speed regulation, easy to achieve, is designed based on the characteristics of SRM in this paper. A first-order dynamic model in s domain is derived according to the simplified model of SRM. The relationship between PI parameters, average voltage and actual speed of the system is obtained based on the first-order dynamic model and then the adaptive adjustment of PI parameters is realized. The characteristics between traditional PI controller and adaptive PI controller have been compared by experiments, and results show that a better performance is achieved by adopting the adaptive PI controller. The system has rapid response with little overshoot, zero steady state error and high robustness to load torque disturbance.
{"title":"Application of an adaptive PI controller for a switched reluctance motor drive","authors":"Jiancheng Song, Shunqian Song, Bingni Qu","doi":"10.1109/SPEC.2016.7846009","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7846009","url":null,"abstract":"Nonlinear inductance profiles of switched reluctance motor (SRM) cause the complicated design of controllers, which leads to SRMs have not been widely applied in industries fileds. A traditional PI controller with fixed gain is easy to realize the control of SRMs. It can not provide good control performance over the whole range of speed regulation. To solve the problem, an adaptive PI controller of speed regulation, easy to achieve, is designed based on the characteristics of SRM in this paper. A first-order dynamic model in s domain is derived according to the simplified model of SRM. The relationship between PI parameters, average voltage and actual speed of the system is obtained based on the first-order dynamic model and then the adaptive adjustment of PI parameters is realized. The characteristics between traditional PI controller and adaptive PI controller have been compared by experiments, and results show that a better performance is achieved by adopting the adaptive PI controller. The system has rapid response with little overshoot, zero steady state error and high robustness to load torque disturbance.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121081444","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 : 2016-12-01DOI: 10.1109/SPEC.2016.7846220
Zhijia Wang, U. Madawala, Tian‐Hua Liu, D. Vilathgamuwa, D. Thrimawithana
Three-phase cage induction machines, configured in two series-connected and one isolated (TSCAOI) configuration, have earlier been proposed for variable speed single-phase electricity generation. Although steady-state characteristics of TSCAOI generators have previously been investigated, both the nature of torque due to unbalanced operation and its impact on overall performance are yet to be analyzed. This paper therefore carries out a detailed investigation into the torque production of the generator, analyzing both the average and fluctuating components of the torque under various operating conditions. Theoretical torque-speed characteristics of a 3 kW 4-pole TSCAOI configured generator are presented in comparison to simulations, discussing its salient features and limitations.
{"title":"Torque characteristics of TSCAOI configured induction generators","authors":"Zhijia Wang, U. Madawala, Tian‐Hua Liu, D. Vilathgamuwa, D. Thrimawithana","doi":"10.1109/SPEC.2016.7846220","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7846220","url":null,"abstract":"Three-phase cage induction machines, configured in two series-connected and one isolated (TSCAOI) configuration, have earlier been proposed for variable speed single-phase electricity generation. Although steady-state characteristics of TSCAOI generators have previously been investigated, both the nature of torque due to unbalanced operation and its impact on overall performance are yet to be analyzed. This paper therefore carries out a detailed investigation into the torque production of the generator, analyzing both the average and fluctuating components of the torque under various operating conditions. Theoretical torque-speed characteristics of a 3 kW 4-pole TSCAOI configured generator are presented in comparison to simulations, discussing its salient features and limitations.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116624782","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 : 2016-12-01DOI: 10.1109/SPEC.2016.7845997
M. Ramezani, O. Ojo
This paper sets forth the decoupling procedures for a triple-star interior permanent magnet machines where the inductances are mutually coupled between the three machine sets when the original model equations are transformed to the rotor reference frame. Dynamic and steady-state analyses based on this coupled model is complicated. It is very hard to ensure total independence of the controllers for the three sets of machine, thereby negatively affecting the dynamic response of the speed or toque control scheme. The proposed decoupling methodology is based on the standard rotor reference transformation of the natural variables, the result of which is decoupled using a transformation based on the eigenvectors of the resulting impedance matrix. The eigenvalues are the new diagonal elements of the impedance matrix. Some simulation results confirm the utility of the proposed decoupling methodology.
{"title":"Decoupling methodology and application to triple star interior permanent magnet machines","authors":"M. Ramezani, O. Ojo","doi":"10.1109/SPEC.2016.7845997","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7845997","url":null,"abstract":"This paper sets forth the decoupling procedures for a triple-star interior permanent magnet machines where the inductances are mutually coupled between the three machine sets when the original model equations are transformed to the rotor reference frame. Dynamic and steady-state analyses based on this coupled model is complicated. It is very hard to ensure total independence of the controllers for the three sets of machine, thereby negatively affecting the dynamic response of the speed or toque control scheme. The proposed decoupling methodology is based on the standard rotor reference transformation of the natural variables, the result of which is decoupled using a transformation based on the eigenvectors of the resulting impedance matrix. The eigenvalues are the new diagonal elements of the impedance matrix. Some simulation results confirm the utility of the proposed decoupling methodology.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121668148","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 : 2016-12-01DOI: 10.1109/SPEC.2016.7846181
Takuya Shijo, Shinya Kurachi, Yujiro Noda, H. Yamada, Toshihiko Tanaka
This paper presents the detection of small-foreign-metal particles using a 400 kHz SiC-MOSFETs high-frequency inverter. A 400 kHz SiC-MOSFETs high-frequency inverter is constructed and tested, and then applied to the small-foreign-metal particles detection on high-performance chemical films (HPCFs) with induction heating (IH). Experimental results demonstrate that the developed 400 kHz SiC-MOSFETs high-frequency inverter can heat small-foreign-metal particle on HPCFs with IH. Thus, small-foreign-metal particle can be detected with the help of a thermographic camera along with the constructed 400 kHz SiC-MOSFETs high-frequency inverter. Losses caused by SiC-MOSFETs are analyzed in detail to improve power conversion efficiency of the constructed high-frequency inverter. Experimental results also demonstrate that parallel connections of two SiC-MOSFETs effectively reduces the losses, where power conversion efficiency is 96.8 % and improved by 1.9 %.
本文介绍了一种利用400 kHz sic - mosfet高频逆变器检测微小外来金属颗粒的方法。构建并测试了400 kHz sic - mosfet高频逆变器，并将其应用于感应加热的高性能化学薄膜(HPCFs)上的微小外来金属颗粒检测。实验结果表明，所研制的400 kHz sic - mosfet高频逆变器可以对HPCFs上的微小外来金属颗粒进行IH加热。因此，借助热像仪以及构建的400 kHz sic - mosfet高频逆变器，可以检测到小的外来金属颗粒。为了提高所构建的高频逆变器的功率转换效率，详细分析了硅基mosfet的损耗。实验结果还表明，两个sic - mosfet并联可有效降低损耗，功率转换效率为96.8%，提高1.9%。
{"title":"A 400 kHz SiC-MOSFETs high-frequency inverter for small-foreign-metal particle detection","authors":"Takuya Shijo, Shinya Kurachi, Yujiro Noda, H. Yamada, Toshihiko Tanaka","doi":"10.1109/SPEC.2016.7846181","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7846181","url":null,"abstract":"This paper presents the detection of small-foreign-metal particles using a 400 kHz SiC-MOSFETs high-frequency inverter. A 400 kHz SiC-MOSFETs high-frequency inverter is constructed and tested, and then applied to the small-foreign-metal particles detection on high-performance chemical films (HPCFs) with induction heating (IH). Experimental results demonstrate that the developed 400 kHz SiC-MOSFETs high-frequency inverter can heat small-foreign-metal particle on HPCFs with IH. Thus, small-foreign-metal particle can be detected with the help of a thermographic camera along with the constructed 400 kHz SiC-MOSFETs high-frequency inverter. Losses caused by SiC-MOSFETs are analyzed in detail to improve power conversion efficiency of the constructed high-frequency inverter. Experimental results also demonstrate that parallel connections of two SiC-MOSFETs effectively reduces the losses, where power conversion efficiency is 96.8 % and improved by 1.9 %.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121731796","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 : 2016-12-01DOI: 10.1109/SPEC.2016.7846145
Seog Y. Jeong, H. G. Kwak, Gi C. Jang, C. Rim
A living object detection (LOD) system based on a comb pattern capacitive sensor with simple and cost-effective characteristics is applied to wireless EV chargers for the first time in this paper. The proposed LOD system mounted on a transmitter (Tx) pad adopts an optimal comb shape as a sensing pattern to obtain uniform capacitance capability. Unlike general applications using a capacitive sensor, the proposed capacitive sensor, which is applied to wireless EV chargers, inherently contains significant capacitive coupling between the living object and the ground. This capacitive coupling should be carefully considered in order to accurately sense any minimal capacitance change caused by the presence of a living object. In this paper, a static circuit model of the proposed capacitive sensor with a living object considering the ground effect and an RC integrator to detect even a tiny voltage difference are established and verified by experiments. The results show that when a living object is present, the measured capacitance by the proposed sensing pattern was increased by up to 27.5% compared to when there is no living object.
{"title":"Living object detection system based on comb pattern capacitive sensor for wireless EV chargers","authors":"Seog Y. Jeong, H. G. Kwak, Gi C. Jang, C. Rim","doi":"10.1109/SPEC.2016.7846145","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7846145","url":null,"abstract":"A living object detection (LOD) system based on a comb pattern capacitive sensor with simple and cost-effective characteristics is applied to wireless EV chargers for the first time in this paper. The proposed LOD system mounted on a transmitter (Tx) pad adopts an optimal comb shape as a sensing pattern to obtain uniform capacitance capability. Unlike general applications using a capacitive sensor, the proposed capacitive sensor, which is applied to wireless EV chargers, inherently contains significant capacitive coupling between the living object and the ground. This capacitive coupling should be carefully considered in order to accurately sense any minimal capacitance change caused by the presence of a living object. In this paper, a static circuit model of the proposed capacitive sensor with a living object considering the ground effect and an RC integrator to detect even a tiny voltage difference are established and verified by experiments. The results show that when a living object is present, the measured capacitance by the proposed sensing pattern was increased by up to 27.5% compared to when there is no living object.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123744863","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 : 2016-12-01DOI: 10.1109/SPEC.2016.7846182
C. Teixeira, J. Riedel, D. G. Holmes, B. Mcgrath
Unbalanced transformer impedances for three-phase dual active bridge (DAB) converters cause different zero voltage switching (ZVS) boundaries for each phase leg, which limit the converter soft switching regions. This paper uses harmonic analysis to demonstrate how asymmetrical PSSW modulation can be applied to shape each phase leg's ZVS boundary. The conclusions from the analysis provide guidelines to extend the ZVS range of practical three-phase DABs as is experimentally verified on a laboratory prototype.
{"title":"Extended soft switching operation of three-phase dual active bridge converters with unbalanced transformer impedances","authors":"C. Teixeira, J. Riedel, D. G. Holmes, B. Mcgrath","doi":"10.1109/SPEC.2016.7846182","DOIUrl":"https://doi.org/10.1109/SPEC.2016.7846182","url":null,"abstract":"Unbalanced transformer impedances for three-phase dual active bridge (DAB) converters cause different zero voltage switching (ZVS) boundaries for each phase leg, which limit the converter soft switching regions. This paper uses harmonic analysis to demonstrate how asymmetrical PSSW modulation can be applied to shape each phase leg's ZVS boundary. The conclusions from the analysis provide guidelines to extend the ZVS range of practical three-phase DABs as is experimentally verified on a laboratory prototype.","PeriodicalId":403316,"journal":{"name":"2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125599650","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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