Pub Date : 2012-10-01DOI: 10.1109/VPPC.2012.6422684
G. Reddy, S. Choudhari, S. Mohiuddin
This paper presents results of an experiment to estimate the harvestable green energy from vehicle suspension. In phase I, the integrated vehicle suspension is modeled and simulated using Matlab/Simulink. In phase II, real-time vibration data, from the vehicle suspension, was collected using a suspension travel sensor/data acquisition system. In phase III, the collected vibration-data is then used as the input to the simulink suspension model to estimate the harvestable energy per hour of driving. The estimated energy was around 2000 watt-hours per hour of driving. In phase IV with various case studies, it is observed that one can extract more energy in the city driving than the highway driving. The paper details the modeling and simulation of the vehicle suspension; the experimental setup to collect the real-time vibration-data; and finally presents analysis results in graphical format including: the actual vibration, the forces acting on the front and back suspensions, and last the harvested energy in watt-hours with time. And finally the potential for this energy is compared to the traditional regenerative energy in an electric vehicle is discussed.
{"title":"Estimation of harvestable green energy from vehicle suspension","authors":"G. Reddy, S. Choudhari, S. Mohiuddin","doi":"10.1109/VPPC.2012.6422684","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422684","url":null,"abstract":"This paper presents results of an experiment to estimate the harvestable green energy from vehicle suspension. In phase I, the integrated vehicle suspension is modeled and simulated using Matlab/Simulink. In phase II, real-time vibration data, from the vehicle suspension, was collected using a suspension travel sensor/data acquisition system. In phase III, the collected vibration-data is then used as the input to the simulink suspension model to estimate the harvestable energy per hour of driving. The estimated energy was around 2000 watt-hours per hour of driving. In phase IV with various case studies, it is observed that one can extract more energy in the city driving than the highway driving. The paper details the modeling and simulation of the vehicle suspension; the experimental setup to collect the real-time vibration-data; and finally presents analysis results in graphical format including: the actual vibration, the forces acting on the front and back suspensions, and last the harvested energy in watt-hours with time. And finally the potential for this energy is compared to the traditional regenerative energy in an electric vehicle is discussed.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129560464","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 : 2012-10-01DOI: 10.1109/VPPC.2012.6422576
Jae-Hyun Lee, Rae-Kwan Park, H. Mok, Kiwan Ju
Series hybrid electric vehicles (HEVs) have a power-train structure in which the engine, battery, generator, and traction motor are connected in series. As a result, the operational performance of HEVs depends on the performance of the traction machine. This paper proposes a traction torque control method for a series HEV application driven by an interior permanent-magnet synchronous machine (IPMSM). To this end, the method to preset the optimized flux linkage table was applied on the basis of the machine design data for torque control. The proposed method was verified by a test using a 120kW IPMSM.
{"title":"Traction torque control for HEV applications driven by an IPMSM using pre-set optimized flux linkage tables","authors":"Jae-Hyun Lee, Rae-Kwan Park, H. Mok, Kiwan Ju","doi":"10.1109/VPPC.2012.6422576","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422576","url":null,"abstract":"Series hybrid electric vehicles (HEVs) have a power-train structure in which the engine, battery, generator, and traction motor are connected in series. As a result, the operational performance of HEVs depends on the performance of the traction machine. This paper proposes a traction torque control method for a series HEV application driven by an interior permanent-magnet synchronous machine (IPMSM). To this end, the method to preset the optimized flux linkage table was applied on the basis of the machine design data for torque control. The proposed method was verified by a test using a 120kW IPMSM.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129644960","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 : 2012-10-01DOI: 10.1109/VPPC.2012.6422649
F. Kurokawa, M. Motomura, K. Ueno, H. Maruta
The purpose of this paper is to present a new neural network based method for digitally controlled dc-dc converters. In the presented method, the neural network predictor is used to modify the reference value of the output voltage in the PID control to improve the transient response. This neural network control operates in coordination with the PID control. At the first, the neural network is repeatedly trained to predict the output voltage using former predicted data for the modification of the reference. After the training, the reference in the PID control is modified by the predictor to improve the transient response. This training process proceeds repeatedly until the enough suppression of the output voltage against the load change is obtained. As a result, the undershoot of the output voltage is considerably suppressed from 3.4% to 2.0% compared with the conventional method. The convergence time is suppressed to 52% compared with conventional method's one. Therefore, it is confirmed that the proposed method has the superior performance to control dc-dc converters compared to the conventional method.
{"title":"A new neural network predictor for digital control DC-DC converter","authors":"F. Kurokawa, M. Motomura, K. Ueno, H. Maruta","doi":"10.1109/VPPC.2012.6422649","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422649","url":null,"abstract":"The purpose of this paper is to present a new neural network based method for digitally controlled dc-dc converters. In the presented method, the neural network predictor is used to modify the reference value of the output voltage in the PID control to improve the transient response. This neural network control operates in coordination with the PID control. At the first, the neural network is repeatedly trained to predict the output voltage using former predicted data for the modification of the reference. After the training, the reference in the PID control is modified by the predictor to improve the transient response. This training process proceeds repeatedly until the enough suppression of the output voltage against the load change is obtained. As a result, the undershoot of the output voltage is considerably suppressed from 3.4% to 2.0% compared with the conventional method. The convergence time is suppressed to 52% compared with conventional method's one. Therefore, it is confirmed that the proposed method has the superior performance to control dc-dc converters compared to the conventional method.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127327421","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 : 2012-10-01DOI: 10.1109/VPPC.2012.6422568
Yuan-Chih Chang, Jui-Teng Chan, Jian-Cheng Chen, Jeng-Gung Yang
In the applications of hybrid electrical vehicle (HEV) and electrical vehicle (EV) power systems, the permanent magnet synchronous machines (PMSM) provide better torque generating capabilities, higher power density and higher power conversion efficiency. This paper develops the permanent magnet synchronous generator (PMSG) drive for the electrical vehicle. The PMSM can be driven in both motor mode and generator modes, and the main objective of this study is to establish the PMSG drive for charging the batteries embedded in EV/HEV. The voltage and torque equations of the PMSG are derived in this study. In addition, the machine parameters including back-EMF constant, winding inductance and winding resistance are estimated. Therefore, the space-vector based feedforward current control scheme is proposed via the voltage equations. The corresponding duty ratio of each power semiconductor switch in the PMSG drive is determined by the single chip microcontroller. The power switches and power diodes are chosen according to the rating of the PMSG. After the establishment of the PMSG drive, some experimental results are measured to verify the generation performance. The soft starting of the PMSG drive is developed to avoid unsuspected voltage and current transients. High power conversion efficiency of the PMSG drive and low harmonic distortion of the generator winding current are obtained via the proposed current control scheme.
{"title":"Development of permanent magnet synchronous generator drive in electrical vehicle power system","authors":"Yuan-Chih Chang, Jui-Teng Chan, Jian-Cheng Chen, Jeng-Gung Yang","doi":"10.1109/VPPC.2012.6422568","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422568","url":null,"abstract":"In the applications of hybrid electrical vehicle (HEV) and electrical vehicle (EV) power systems, the permanent magnet synchronous machines (PMSM) provide better torque generating capabilities, higher power density and higher power conversion efficiency. This paper develops the permanent magnet synchronous generator (PMSG) drive for the electrical vehicle. The PMSM can be driven in both motor mode and generator modes, and the main objective of this study is to establish the PMSG drive for charging the batteries embedded in EV/HEV. The voltage and torque equations of the PMSG are derived in this study. In addition, the machine parameters including back-EMF constant, winding inductance and winding resistance are estimated. Therefore, the space-vector based feedforward current control scheme is proposed via the voltage equations. The corresponding duty ratio of each power semiconductor switch in the PMSG drive is determined by the single chip microcontroller. The power switches and power diodes are chosen according to the rating of the PMSG. After the establishment of the PMSG drive, some experimental results are measured to verify the generation performance. The soft starting of the PMSG drive is developed to avoid unsuspected voltage and current transients. High power conversion efficiency of the PMSG drive and low harmonic distortion of the generator winding current are obtained via the proposed current control scheme.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130743395","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 : 2012-10-01DOI: 10.1109/VPPC.2012.6422714
Hong-Jong Lee, Baek-haeng Lee, Dong-hyun Shin, Jin-Beom Jeong, Taehoon Kim, Hyun-Sik Song, Byounghoon Kim, W. Lim
The latest paradigm in the global automobile market is shifting toward environment-friendly vehicles (such as HEVs, PHEVs, and EVs), and high-efficiency, large-capacity lithium rechargeable batteries are being used to increase vehicle's fuel efficiency and extend the driving distance. However, there have been safety concerns, including batteries in recently sold environment-friendly vehicle catching fire. In order to address these issues and to secure safety, manufacturers of rechargeable batteries and environment-friendly vehicles are performing reliability tests prior to installing batteries in the vehicles. Most standards for temperature-related environmental tests for battery systems are in the works, and the ones that have been established adhere to the specifications for electrical systems installed in conventional automobiles. Therefore, this study analyzes the results of comparative experiments to assess whether the temperature environmental evaluation test guidelines for electrical systems in conventional vehicles can be applied to battery systems for environment-friendly automobiles.
{"title":"A study on the temperature stabilization time during temperature environmental test of the battery system for green cars","authors":"Hong-Jong Lee, Baek-haeng Lee, Dong-hyun Shin, Jin-Beom Jeong, Taehoon Kim, Hyun-Sik Song, Byounghoon Kim, W. Lim","doi":"10.1109/VPPC.2012.6422714","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422714","url":null,"abstract":"The latest paradigm in the global automobile market is shifting toward environment-friendly vehicles (such as HEVs, PHEVs, and EVs), and high-efficiency, large-capacity lithium rechargeable batteries are being used to increase vehicle's fuel efficiency and extend the driving distance. However, there have been safety concerns, including batteries in recently sold environment-friendly vehicle catching fire. In order to address these issues and to secure safety, manufacturers of rechargeable batteries and environment-friendly vehicles are performing reliability tests prior to installing batteries in the vehicles. Most standards for temperature-related environmental tests for battery systems are in the works, and the ones that have been established adhere to the specifications for electrical systems installed in conventional automobiles. Therefore, this study analyzes the results of comparative experiments to assess whether the temperature environmental evaluation test guidelines for electrical systems in conventional vehicles can be applied to battery systems for environment-friendly automobiles.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130233851","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 : 2012-10-01DOI: 10.1109/VPPC.2012.6422599
Jin-Gook Lee, Jae-sub Ko, Da-Eun Jeong, Hak-Gyun Jeong, Dae-kyong Kim, D. Chung
This paper proposes a variable step size incremental conductance(VSSIC) method for the maximum power point tracking(MPPT) control of a photovoltaic. The conventional perturbation & observation(PO) and IC MPPT control algorithm generally uses fixed step size. A small fixed step size will cause the tracking speed to decrease and tracking accuracy of the MPP will decrease due to large fixed step size. Therefore, this paper proposes the VSSIC MPPT algorithm that adjusts automatically step size according to operating conditions. To improve tracking speed and accuracy, when operating point is far from maximum power point(MPP), step size uses maximum value and when operating point is near from MPP, step size uses variable step size that adjust according to slope of curve. The validity of MPPT algorithm proposed in this paper proves through compare with conventional IC MPPT algorithm.
{"title":"High performance MPPT control of photovoltaic using VSSIC method","authors":"Jin-Gook Lee, Jae-sub Ko, Da-Eun Jeong, Hak-Gyun Jeong, Dae-kyong Kim, D. Chung","doi":"10.1109/VPPC.2012.6422599","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422599","url":null,"abstract":"This paper proposes a variable step size incremental conductance(VSSIC) method for the maximum power point tracking(MPPT) control of a photovoltaic. The conventional perturbation & observation(PO) and IC MPPT control algorithm generally uses fixed step size. A small fixed step size will cause the tracking speed to decrease and tracking accuracy of the MPP will decrease due to large fixed step size. Therefore, this paper proposes the VSSIC MPPT algorithm that adjusts automatically step size according to operating conditions. To improve tracking speed and accuracy, when operating point is far from maximum power point(MPP), step size uses maximum value and when operating point is near from MPP, step size uses variable step size that adjust according to slope of curve. The validity of MPPT algorithm proposed in this paper proves through compare with conventional IC MPPT algorithm.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130458804","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 : 2012-10-01DOI: 10.1109/VPPC.2012.6422528
J. Sim, Jae-Woo Jung, Yong-Hoon Kim, Byeong-Hwa Lee, Jung-Pyo Hong
Cogging torque and torque ripple of surface-mounted permanent magnet synchronous motor applied to electric power steering (EPS) have been one of the main concerns in manufacturing the EPS system. A variety of methods have been suggested to minimize cogging torque and torque ripple. However, this paper presents 2 different types of the motor and a comparative result from their characteristic analyses using finite element method. Both are composed of 8 poles/12 slots with concentrated windings while one have equal tooth widths and the other unequal tooth widths. Furthermore, it is scarcely possible to induce equations which express the relations among the 4 design parameters, eccentricity, angle between tooth tips, small tooth width, and pole arc. Therefore, this paper purposes optimization of unequal type for EPS motor through response surface methodology.
{"title":"Optimum design of SPMSM with concentrated windings and unequal tooth widths for EPS","authors":"J. Sim, Jae-Woo Jung, Yong-Hoon Kim, Byeong-Hwa Lee, Jung-Pyo Hong","doi":"10.1109/VPPC.2012.6422528","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422528","url":null,"abstract":"Cogging torque and torque ripple of surface-mounted permanent magnet synchronous motor applied to electric power steering (EPS) have been one of the main concerns in manufacturing the EPS system. A variety of methods have been suggested to minimize cogging torque and torque ripple. However, this paper presents 2 different types of the motor and a comparative result from their characteristic analyses using finite element method. Both are composed of 8 poles/12 slots with concentrated windings while one have equal tooth widths and the other unequal tooth widths. Furthermore, it is scarcely possible to induce equations which express the relations among the 4 design parameters, eccentricity, angle between tooth tips, small tooth width, and pole arc. Therefore, this paper purposes optimization of unequal type for EPS motor through response surface methodology.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131326151","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 : 2012-10-01DOI: 10.1109/VPPC.2012.6422540
Gyu-won Cho, Tea-Seok Jung, Gyu-Tak Kim
The inductance of IPMSM was calculated using a Direct Current Test(DCT) and Current Vector Control Test (CVCT). The CVCT has advantages related to the current phase angle, and does not require separate experiment equipment. However, large error at current phase angles of 0° and 90° is generated. By contrast, DCT can calculate the inductance at 0° and 90° only, but the precision is very high. In this paper, the inductance was calculated through CVCT and DCT and the results were compared and studied. The validity of the approach was verified through a torque performing experiment.
{"title":"The precision inductance estimation of IPMSM for vehicles","authors":"Gyu-won Cho, Tea-Seok Jung, Gyu-Tak Kim","doi":"10.1109/VPPC.2012.6422540","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422540","url":null,"abstract":"The inductance of IPMSM was calculated using a Direct Current Test(DCT) and Current Vector Control Test (CVCT). The CVCT has advantages related to the current phase angle, and does not require separate experiment equipment. However, large error at current phase angles of 0° and 90° is generated. By contrast, DCT can calculate the inductance at 0° and 90° only, but the precision is very high. In this paper, the inductance was calculated through CVCT and DCT and the results were compared and studied. The validity of the approach was verified through a torque performing experiment.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129201417","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 : 2012-10-01DOI: 10.1109/VPPC.2012.6422724
So-Yeon Kim, Byung-Geuk Cho, S. Sul
Korean navy is now investigating how new naval destroyer can be designed by Integrated Full Electric Propulsion (IFEP) system. The operating cost of the electric propulsion system is smaller than that of the mechanical propulsion system. However, the existing IFEP system is still spending an enormous fuel due to Navy's conservative operating concept-Dual Generator Operation-for higher reliability. To improve the fuel-efficiency of the IFEP power system, the Single Generator Operation (SGO) is a rational solution because it could maximize the load factor of the generator. But the SGO is difficult to be accepted by the Navy as a reliable operating concept without full back-up of the entire electric power including propulsion power. This paper proposes a novel IFEP system having Battery Energy Storage System (BESS) which can guarantee reliable SGO. The feasibility, effectiveness and some design requirements of the proposed Integrated Power System (IPS) is discussed by computer simulations and reference data.
{"title":"Feasibility study of Integrated Power System with Battery Energy Storage System for naval ships","authors":"So-Yeon Kim, Byung-Geuk Cho, S. Sul","doi":"10.1109/VPPC.2012.6422724","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422724","url":null,"abstract":"Korean navy is now investigating how new naval destroyer can be designed by Integrated Full Electric Propulsion (IFEP) system. The operating cost of the electric propulsion system is smaller than that of the mechanical propulsion system. However, the existing IFEP system is still spending an enormous fuel due to Navy's conservative operating concept-Dual Generator Operation-for higher reliability. To improve the fuel-efficiency of the IFEP power system, the Single Generator Operation (SGO) is a rational solution because it could maximize the load factor of the generator. But the SGO is difficult to be accepted by the Navy as a reliable operating concept without full back-up of the entire electric power including propulsion power. This paper proposes a novel IFEP system having Battery Energy Storage System (BESS) which can guarantee reliable SGO. The feasibility, effectiveness and some design requirements of the proposed Integrated Power System (IPS) is discussed by computer simulations and reference data.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125455463","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}
In the series-connected lithium-ion battery string application for electric vehicles, equalizer is needed to enhance battery cycle life and maintain the stable performance. The equalizer is taken as an important part of battery management system (BMS), which detects the voltage of each cell to determine the control strategy for equalizer. How to improve the efficiency and reduce loss is always the problem to be solved. This paper proposes a high efficiency nondissipative equalizer for series-connected battery string, which uses forward converter to transfer energy from the highest voltage battery to the lowest voltage one. Current feedback is taken to maintain the stability of output current by adjusting the duty of Pulse Width Modulation (PWM) signal. The proposed equalizer has characteristics such as low loss, high efficiency and short equalization time. The operation principle of the proposed equalizer and design analysis is presented in this paper. Experimental results verify that the proposed equalization method has good cell balancing performance.
{"title":"A high efficiency equalizer based on forward converter for series connected battery string","authors":"Jinlei Sun, Ren-gui Lu, Guo Wei, Bingliang Xu, Chunbo Zhu","doi":"10.1109/VPPC.2012.6422669","DOIUrl":"https://doi.org/10.1109/VPPC.2012.6422669","url":null,"abstract":"In the series-connected lithium-ion battery string application for electric vehicles, equalizer is needed to enhance battery cycle life and maintain the stable performance. The equalizer is taken as an important part of battery management system (BMS), which detects the voltage of each cell to determine the control strategy for equalizer. How to improve the efficiency and reduce loss is always the problem to be solved. This paper proposes a high efficiency nondissipative equalizer for series-connected battery string, which uses forward converter to transfer energy from the highest voltage battery to the lowest voltage one. Current feedback is taken to maintain the stability of output current by adjusting the duty of Pulse Width Modulation (PWM) signal. The proposed equalizer has characteristics such as low loss, high efficiency and short equalization time. The operation principle of the proposed equalizer and design analysis is presented in this paper. Experimental results verify that the proposed equalization method has good cell balancing performance.","PeriodicalId":341659,"journal":{"name":"2012 IEEE Vehicle Power and Propulsion Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126273476","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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