Pub Date : 2012-11-12DOI: 10.1109/ECCE.2012.6342595
Yue Zhao, W. Qiao, Long Wu
Because of the high robustness to system structure and parameter uncertainties, discrete-time sliding-mode observer (DSMO) has become a promising candidate for sensorless digital control of interior permanent magnet synchronous machines (IPMSMs). However, it is challenging to achieve fully sliding mode under a low sampling frequency, especially for high speed and heavy load applications. In order to overcome this problem, a multilayer DSMO is proposed to estimate the rotor position from the extended back electromagnetic force (EMF). To guarantee a fast response to speed and torque variations, the width of the boundary layer of the DSMO is designed to be adaptive to speed and torque variations. A parameter adaption scheme based on control law and sliding-mode dynamics is proposed for selecting the width of the boundary layer and the observer gain. The proposed multilayer DSMO is validated by simulations and experimental results on a 150 kW IPMSM drive system used for hybrid electric vehicles.
{"title":"Sensorless control for IPMSMs based on a multilayer discrete-time sliding-mode observer","authors":"Yue Zhao, W. Qiao, Long Wu","doi":"10.1109/ECCE.2012.6342595","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342595","url":null,"abstract":"Because of the high robustness to system structure and parameter uncertainties, discrete-time sliding-mode observer (DSMO) has become a promising candidate for sensorless digital control of interior permanent magnet synchronous machines (IPMSMs). However, it is challenging to achieve fully sliding mode under a low sampling frequency, especially for high speed and heavy load applications. In order to overcome this problem, a multilayer DSMO is proposed to estimate the rotor position from the extended back electromagnetic force (EMF). To guarantee a fast response to speed and torque variations, the width of the boundary layer of the DSMO is designed to be adaptive to speed and torque variations. A parameter adaption scheme based on control law and sliding-mode dynamics is proposed for selecting the width of the boundary layer and the observer gain. The proposed multilayer DSMO is validated by simulations and experimental results on a 150 kW IPMSM drive system used for hybrid electric vehicles.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85911756","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342766
H. Mirzaee, S. Bhattachary, S. Bala
In this paper the design issues of a medium-voltage DC amplifier with a multi-pulse thyristor bridge front-end are presented. A medium voltage dc amplifier is needed in de-risking new technologies coming onboard future electric ships. Based on the required system dynamic specifications, an initial design reveals the problems with a multi-pulse thyristor front-end, and then provides a novel solution to meet the requirements, are presented. The proposed system solution is validated through both simulation and experimental results.
{"title":"Design issues in a medium-voltage DC amplifier with a multi-pulse thyristor bridge front-end","authors":"H. Mirzaee, S. Bhattachary, S. Bala","doi":"10.1109/ECCE.2012.6342766","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342766","url":null,"abstract":"In this paper the design issues of a medium-voltage DC amplifier with a multi-pulse thyristor bridge front-end are presented. A medium voltage dc amplifier is needed in de-risking new technologies coming onboard future electric ships. Based on the required system dynamic specifications, an initial design reveals the problems with a multi-pulse thyristor front-end, and then provides a novel solution to meet the requirements, are presented. The proposed system solution is validated through both simulation and experimental results.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84174340","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342784
T. Butschen, Zhan Wang, M. Kaymak, R. D. De Doncker
The focus of this paper is the presentation of an innovative realization of a compact package and a small-sized gate drive unit (GDU) for a dual gate commutated thyristor (Dual-GCT). The package includes, like in an internally commutated thyristor (ICT) [1], the turn-off but additionally the turn-on unit to achieve fast turn-on (1000 A/μs) and -off (320 A/μs) switching. The new gate drive design is significantly smaller (reduction of 85 % compared to a standard GDU) and less complex. A temperature-resistant (up to 125°C) package for a Dual-GCT is achieved.
{"title":"Compact high temperature package with smart size optimized gate drive unit for assembling the Dual-ICT","authors":"T. Butschen, Zhan Wang, M. Kaymak, R. D. De Doncker","doi":"10.1109/ECCE.2012.6342784","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342784","url":null,"abstract":"The focus of this paper is the presentation of an innovative realization of a compact package and a small-sized gate drive unit (GDU) for a dual gate commutated thyristor (Dual-GCT). The package includes, like in an internally commutated thyristor (ICT) [1], the turn-off but additionally the turn-on unit to achieve fast turn-on (1000 A/μs) and -off (320 A/μs) switching. The new gate drive design is significantly smaller (reduction of 85 % compared to a standard GDU) and less complex. A temperature-resistant (up to 125°C) package for a Dual-GCT is achieved.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78283202","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342262
S. Ben-Yaakov, Alon Blumenfeld, A. Cervera, M. Evzelman
A switched-capacitor based equalization scheme is proposed for overcoming the adverse effect of shaded panels in a serially connected PV array. The proposed solution is based on a modular approach, in which each two panels are connected to a resonant switched-capacitor converter. The distribution of currents and power extraction improvement have been derived and verified experimentally and design guidelines to meet desired power loss level requirements have been developed. The experimental equalizing module was designed for 185W PV panels and was found to boost the maximum available power by about 50% when interfaced with two serially connected PV panels under insolation ratios between 20% and 100%. The analytical, simulation and experimental results suggest that the proposed approach is effective in extracting all available power with relatively high efficiency.
{"title":"Design and evaluation of a modular resonant switched capacitors equalizer for PV panels","authors":"S. Ben-Yaakov, Alon Blumenfeld, A. Cervera, M. Evzelman","doi":"10.1109/ECCE.2012.6342262","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342262","url":null,"abstract":"A switched-capacitor based equalization scheme is proposed for overcoming the adverse effect of shaded panels in a serially connected PV array. The proposed solution is based on a modular approach, in which each two panels are connected to a resonant switched-capacitor converter. The distribution of currents and power extraction improvement have been derived and verified experimentally and design guidelines to meet desired power loss level requirements have been developed. The experimental equalizing module was designed for 185W PV panels and was found to boost the maximum available power by about 50% when interfaced with two serially connected PV panels under insolation ratios between 20% and 100%. The analytical, simulation and experimental results suggest that the proposed approach is effective in extracting all available power with relatively high efficiency.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77838044","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342811
A. Zaheer, D. Kacprzak, G. Covic
Inductive Power Transfer (IPT) has proved its capability as a safe, convenient and efficient solution for electric vehicle (EV) charging systems by providing sufficient power levels with tolerance to lateral displacement. The magnetic design of the receiver/secondary and transmitter/primary pads is the most critical part of an IPT system design. This paper presents the performance of a Bipolar Pad (BPP) receiver in a lumped IPT system for EV charging systems and compares it against the performance of a recently proposed receiver design, Double-D Quadrature Pad (DDQP). A 3D finite element modeling tool, which has shown good agreement between measured and simulated results in the past, is used to simulate all the models presented in this paper. The prototype models are also built and tested to verify the simulated results. Although it has been shown that the polarized single sided flux pad design, Double-D Pad (DDP), has much better performance than the non-polarized single sided flux pad design, Circular Pad (CP), still the ability of a receiver pickup to interoperate with both types of transmitters is considered to be highly desirable. In this paper the performance of a BPP receiver is compared against the performance of a DDQP receiver when used with either a DDP transmitter or a CP transmitter. The results show that the BPP receiver approximately matches the output levels provided by a DDQP receiver while using less amount of copper. Finally, the possibility of improving the ability of both the BPP and DDQP receivers to interoperate with both DDP and CP transmitters by changing the receiver ferrite structure is investigated. The results however indicate that for both the BPP and the DDQP receiver designs, the traditional ferrite structure exhibits best material usage efficiency amongst the design possibilities considered in this paper.
{"title":"A bipolar receiver pad in a lumped IPT system for electric vehicle charging applications","authors":"A. Zaheer, D. Kacprzak, G. Covic","doi":"10.1109/ECCE.2012.6342811","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342811","url":null,"abstract":"Inductive Power Transfer (IPT) has proved its capability as a safe, convenient and efficient solution for electric vehicle (EV) charging systems by providing sufficient power levels with tolerance to lateral displacement. The magnetic design of the receiver/secondary and transmitter/primary pads is the most critical part of an IPT system design. This paper presents the performance of a Bipolar Pad (BPP) receiver in a lumped IPT system for EV charging systems and compares it against the performance of a recently proposed receiver design, Double-D Quadrature Pad (DDQP). A 3D finite element modeling tool, which has shown good agreement between measured and simulated results in the past, is used to simulate all the models presented in this paper. The prototype models are also built and tested to verify the simulated results. Although it has been shown that the polarized single sided flux pad design, Double-D Pad (DDP), has much better performance than the non-polarized single sided flux pad design, Circular Pad (CP), still the ability of a receiver pickup to interoperate with both types of transmitters is considered to be highly desirable. In this paper the performance of a BPP receiver is compared against the performance of a DDQP receiver when used with either a DDP transmitter or a CP transmitter. The results show that the BPP receiver approximately matches the output levels provided by a DDQP receiver while using less amount of copper. Finally, the possibility of improving the ability of both the BPP and DDQP receivers to interoperate with both DDP and CP transmitters by changing the receiver ferrite structure is investigated. The results however indicate that for both the BPP and the DDQP receiver designs, the traditional ferrite structure exhibits best material usage efficiency amongst the design possibilities considered in this paper.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82273914","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342610
Yu Du, A. Huang
The conventional digital PWM modules satisfy the resolution requirement of the phase-shift modulation signals for the dual active bridge type converters when the switching frequency is smaller than 25kHz. However, at ultra high frequency the resolution is too low to control the converter. A high resolution digital phase-shift modulation scheme to improve the resolution of the phase-shift angle by a factor around 50 is proposed for a 500kHz dual active bridge type converter. The implementation issues such as the micro-edge positioning and deadtime generation are discussed. The experimental measurement of the gate signal time change with different input angles verifies the high resolution of the phase-shift angle with the proposed scheme. When the maximum phase-shift angle is 30°, a resolution of 0.09% is obtained and the closed-loop digital control with presented high resolution modulation scheme is validated in a 500kHz prototype.
{"title":"A high resolution digital phase-shift modulation scheme for ultra-high frequency dual active bridge converters","authors":"Yu Du, A. Huang","doi":"10.1109/ECCE.2012.6342610","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342610","url":null,"abstract":"The conventional digital PWM modules satisfy the resolution requirement of the phase-shift modulation signals for the dual active bridge type converters when the switching frequency is smaller than 25kHz. However, at ultra high frequency the resolution is too low to control the converter. A high resolution digital phase-shift modulation scheme to improve the resolution of the phase-shift angle by a factor around 50 is proposed for a 500kHz dual active bridge type converter. The implementation issues such as the micro-edge positioning and deadtime generation are discussed. The experimental measurement of the gate signal time change with different input angles verifies the high resolution of the phase-shift angle with the proposed scheme. When the maximum phase-shift angle is 30°, a resolution of 0.09% is obtained and the closed-loop digital control with presented high resolution modulation scheme is validated in a 500kHz prototype.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81386221","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342220
K. Sano, M. Takasaki
This paper proposes a dc circuit breaker for voltage source converter (VSC) based high voltage dc (HVDC) transmission systems. The dc circuit breaker is a solid-state breaker which consists of many semiconductor devices in series with maintaining equal voltage balancing, making it possible to apply to high voltage applications. Moreover, the surge voltage across the circuit breaker is reduced by employing a freewheeling diode. In a system rated at 300 MW in power and 250 kV in dc voltage, conduction loss of the proposed circuit breaker consisting of 4.5 kV devices is estimated at 0.045% of the rated power, which is enough small comparing to the VSCs' power loss. A downscaled HVDC transmission system model rated at 10 kW in power and 360 V in dc voltage was built and a series of experimental results demonstrate the dc fault clearing and rapid restoration of power transmission.
{"title":"A surge-less solid-state dc circuit breaker for voltage source converter based HVDC transmission systems","authors":"K. Sano, M. Takasaki","doi":"10.1109/ECCE.2012.6342220","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342220","url":null,"abstract":"This paper proposes a dc circuit breaker for voltage source converter (VSC) based high voltage dc (HVDC) transmission systems. The dc circuit breaker is a solid-state breaker which consists of many semiconductor devices in series with maintaining equal voltage balancing, making it possible to apply to high voltage applications. Moreover, the surge voltage across the circuit breaker is reduced by employing a freewheeling diode. In a system rated at 300 MW in power and 250 kV in dc voltage, conduction loss of the proposed circuit breaker consisting of 4.5 kV devices is estimated at 0.045% of the rated power, which is enough small comparing to the VSCs' power loss. A downscaled HVDC transmission system model rated at 10 kW in power and 360 V in dc voltage was built and a series of experimental results demonstrate the dc fault clearing and rapid restoration of power transmission.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82352853","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 : 2012-11-12DOI: 10.1109/TPEL.2014.2343615
Huimin Zhou, Junjian Zhao, Yehui Han
This paper presents a new concept of module-integrated converters called PV balancers for photovoltaic applications. The proposed concept enables independent maximum power point tracking (MPPT) for each module, and dramatically decreases the requirements for power converters. The power rating of a PV balancer is less than 20% of its counterparts, and the manufacturing cost is thus significantly reduced. In this paper, two architectures of PV balancers are proposed, analyzed, realized, and verified through simulation and experimental results. It is anticipated that the proposed approach will be a low-cost solution for future photovoltaic power systems.
{"title":"PV balancers: Concept, architectures, and realization","authors":"Huimin Zhou, Junjian Zhao, Yehui Han","doi":"10.1109/TPEL.2014.2343615","DOIUrl":"https://doi.org/10.1109/TPEL.2014.2343615","url":null,"abstract":"This paper presents a new concept of module-integrated converters called PV balancers for photovoltaic applications. The proposed concept enables independent maximum power point tracking (MPPT) for each module, and dramatically decreases the requirements for power converters. The power rating of a PV balancer is less than 20% of its counterparts, and the manufacturing cost is thus significantly reduced. In this paper, two architectures of PV balancers are proposed, analyzed, realized, and verified through simulation and experimental results. It is anticipated that the proposed approach will be a low-cost solution for future photovoltaic power systems.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78703576","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}
LCL filter characterized with high harmonic current attenuating performance and low cost are suitable for medium and high power grid-connected inverters. But, the resonance poles endanger the safety of operation, and the active damping (AD) is an effective means to increase the system security. This paper focus on the theoretical exercise of possible strategies to damp the resonance of grid-connected inverter with LCL-filter, the systematical synthesis method for AD is presented, and a unified analytical model for AD is proposed. The AD structures are listed based on single-state variable and single-compensator, and the effective AD strategies are distinguished by root locus. And then, the published AD approaches can be involved in derived AD structures, and the novel AD approach is successfully proposed. The characteristics and performance of the proposed AD approach is analyzed, and its validity is verified by experiment results to demonstrate the success of the theoretical exercise of active damping strategies.
{"title":"Synthesis of active damping for grid-connected inverters with an LCL filter","authors":"Huafeng Xiao, X. Qu, Shaojun Xie, Jinming Xu","doi":"10.15866/IREE.V8I2.1750","DOIUrl":"https://doi.org/10.15866/IREE.V8I2.1750","url":null,"abstract":"LCL filter characterized with high harmonic current attenuating performance and low cost are suitable for medium and high power grid-connected inverters. But, the resonance poles endanger the safety of operation, and the active damping (AD) is an effective means to increase the system security. This paper focus on the theoretical exercise of possible strategies to damp the resonance of grid-connected inverter with LCL-filter, the systematical synthesis method for AD is presented, and a unified analytical model for AD is proposed. The AD structures are listed based on single-state variable and single-compensator, and the effective AD strategies are distinguished by root locus. And then, the published AD approaches can be involved in derived AD structures, and the novel AD approach is successfully proposed. The characteristics and performance of the proposed AD approach is analyzed, and its validity is verified by experiment results to demonstrate the success of the theoretical exercise of active damping strategies.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76026854","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342349
Ho-Ta Lin, T. Liang, Shih-Ming Chen, Kuan-Wen Li
This study proposes a method to forecast the state of charge (SOC) of Li-ion batteries using Fuzzy inference system and Fuzzy identification. In this study, 5 pieces of Li-Co batteries were used in this research for the life-cycle testing. The cycle testing includes CC (0.5C)/CV (4.2V) charge, CC (0.2, 0.4, 0.6, 0.8, 1C) discharge, and the rest time (one minute). The life-cycle testing indicates the relations of the voltage, the discharging time and the SOC with various life-cycles and various discharging currents. This study forecast the SOC with the data of the above, Fuzzy inference system and Fuzzy identification. This study also compares the SOC forecast accuracy using Fuzzy inference system, Fuzzy identification, and Fuzzy inference system combined with Fuzzy identification. The testing results reveal that the average error, the standard deviation, the maximum error, and the minimum error of the forecasted SOC was -0.4%, 6%, 18% and 25.1%, respectively. The 81.48% of the forecasted SOC error is within ± 5%.
{"title":"Forecasting the state-of-charge of Li-ion batteries using fuzzy inference system and fuzzy identification","authors":"Ho-Ta Lin, T. Liang, Shih-Ming Chen, Kuan-Wen Li","doi":"10.1109/ECCE.2012.6342349","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342349","url":null,"abstract":"This study proposes a method to forecast the state of charge (SOC) of Li-ion batteries using Fuzzy inference system and Fuzzy identification. In this study, 5 pieces of Li-Co batteries were used in this research for the life-cycle testing. The cycle testing includes CC (0.5C)/CV (4.2V) charge, CC (0.2, 0.4, 0.6, 0.8, 1C) discharge, and the rest time (one minute). The life-cycle testing indicates the relations of the voltage, the discharging time and the SOC with various life-cycles and various discharging currents. This study forecast the SOC with the data of the above, Fuzzy inference system and Fuzzy identification. This study also compares the SOC forecast accuracy using Fuzzy inference system, Fuzzy identification, and Fuzzy inference system combined with Fuzzy identification. The testing results reveal that the average error, the standard deviation, the maximum error, and the minimum error of the forecasted SOC was -0.4%, 6%, 18% and 25.1%, respectively. The 81.48% of the forecasted SOC error is within ± 5%.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87455422","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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