{"title":"On the Elimination of Pulsed Output Current in Z-loaded Chargers/Rectifiers","authors":"G. Carli, S. Williamson","doi":"10.1109/APEC.2009.4802907","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802907","url":null,"abstract":"As proven in literature, the Z-loaded rectifier is an alternative topology for PFC applications requiring wide output voltage controllability. The main advantage of the Z-rectifier is the availability of two control signals allowing buck-boost operation. This raises the possibility of regarding the Z-rectifier as a novel single-stage PFC converter with ripple-less output regulation, whereby one control signal is used for input current shaping, while the other for reduction of pulsating output current in charger applications. This paper qualifies the advantages over the typical 2-stage approach and describes how decoupling the two control signals and forcing one of them to be placed within its useful range can accomplish such a scheme. Simulations are presented to confirm the mathematical derivations.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120919793","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}
Xuancai Zhu, Chengrui Du, G. Shen, Min Chen, Dehong Xu
{"title":"Analysis of the Non-detection Zone with Passive Islanding Detection Methods for Current Control DG System","authors":"Xuancai Zhu, Chengrui Du, G. Shen, Min Chen, Dehong Xu","doi":"10.1109/APEC.2009.4802682","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802682","url":null,"abstract":"Islanding detection and anti-islanding protection are the essential functions of the gird-connected inverter in DG systems. This paper focuses on the Non-Detection Zone (NDZ) with passive islanding detection method for the DG system with the current control scheme. The parameters of the point of common coupling such as the voltage amplitude and frequency are studied through mathematical derivation. The NDZ regions of the passive islanding detection methods such as OVP/UVP, OFP/UFP are drawn base on the mathematical derivation. And the analysis is verified by the experiment results upon a fuel cell powered DG system with the current control scheme.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121146908","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":"Implementation of Grid-connected Single-phase Inverter Based on FPGA","authors":"Eunsoo Jung, S. Sul","doi":"10.1109/APEC.2009.4802767","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802767","url":null,"abstract":"Exploiting the capability of an FPGA, a digital current controller of a single-phase inverter for grid interface is designed and implemented. A Proportional and Resonant (PR) controller realized in a parallel structure in the FPGA is used to reduce the harmonic current to ac grid. The harmonic compensators based on the PR controller are implemented up to the 19th order. The size of the LCL filter has been extremely reduced because the switching frequency is increased to 100 kHz. The validity of the FPGA based grid-connected single-phase inverter has been evaluated by experimental results.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121313345","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}
H. D. Thai, O. Deleage, H. Chazal, Y. Lembeye, R. Rolland, J. Crebier
{"title":"Design of Modular Converters; Survey and Introduction to Generic Approaches","authors":"H. D. Thai, O. Deleage, H. Chazal, Y. Lembeye, R. Rolland, J. Crebier","doi":"10.1109/APEC.2009.4802853","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802853","url":null,"abstract":"This paper presents a new approach based on converter networks using elementary cells (ec). It deals with the beginning of research and development carried out on the design of the \"ec\", the random command and the magnetic coupling among the elementary cells. This paper introduces at first the recent works carried out on interleaved \"ec\" and power electronics converters (cvs) into networks: from basic interleaving approaches, trying to minimize filter sizes up to highly coupled solutions trying to optimize sizes but also current and voltage levels. In the next sections of the paper, the modular approach will be presented. The paper presents a study showing how a random mode control is used to simplify the implementation of a generic \"ec\" into any network. Evaluating the output voltage filtering criteria, we compare classical synchronous interleaved and random mode controls. Then, the paper focuses on the design and the characterization of the elementary cell and especially on its active part. The last part of the paper focuses on magnetic coupling for converter coupling and filtering. Experimental results underline the importance of coupling among elementary cells and inside the corresponding \"cvs\" and an analytical study of magnetic coupling is presented. An 2n-windings transformer formed of n identical three-winding transformers is used to connect the \"ec\" among them. The aims of these studies are to improve electrical management of modular \"cvs\" network without any constraints on the modularity and the genericity of the approach.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121386875","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":"Power Loss Analyses for Dynamic Phase Number Control in Multiphase Voltage Regulators","authors":"W. Qiu, C. Cheung, S. Xiao, G. Miller","doi":"10.1109/APEC.2009.4802640","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802640","url":null,"abstract":"To improve efficiency over a wide load range, it is important to dynamically adjust the operational phase number in multiphase voltage regulators. This paper analyzes in detail the power loss profile of a synchronous multi-phase buck converter and defines the optimal phase number under different load conditions. Experimental results are provided to verify the theoretical results.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127890953","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":"Analysis and Design of a Non-Isolated Bidirectional ZVS-PWM Active Clamped DC-DC Converter","authors":"P. Das, G. Moschopoulos","doi":"10.1109/APEC.2009.4802857","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802857","url":null,"abstract":"A new soft-switched bidirectional dc-dc converter is proposed in the paper. The proposed converter can operate with soft-switching, a continuous inductor current, fixed switching frequency, and the switch stresses of a conventional PWM converter regardless of the direction of power flow. These features are due to a very simple auxiliary circuit that is operational regardless of the direction of power flow. In the paper, the operation and design of the converter are discussed and its feasibility is confirmed with experimental results obtained from a prototype.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126408232","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}
Min Chen, Cheng Chen, M. Gao, Chonglei Shao, Z. Qian
{"title":"Improved Parallel Igniter for Electronic Ballast of HID Lamps","authors":"Min Chen, Cheng Chen, M. Gao, Chonglei Shao, Z. Qian","doi":"10.1109/APEC.2009.4802870","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802870","url":null,"abstract":"Electronic ballast requires a high voltage igniter to start up the HID lamps. An improved parallel igniter is proposed in this paper. The basic mechanism of it has been analysed and design principle is developed. Based on this parallel igniter, the lamp series inducotr can be optimized seperately. This improves the performance of both the igniter and lamp inductor. The simulation and experimental results verified that the proposed igniter satisfies the pulse requirement especially when the HID lamps start up above the frequency of several hundred kHz.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128022250","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":"Renewable Energy Systems Instability Involving Grid-Parallel Inverters","authors":"M. Cespedes, Jian Sun","doi":"10.1109/APEC.2009.4802943","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802943","url":null,"abstract":"This paper presents a study of renewable energy system stability based on impedance models of the sources and the grid. The focus is grid-parallel inverters controlled in the current injection mode. System stability analysis based on source output impedance and load input impedance is generalized to current-source systems. Output impedance modeling of current-controlled PWM inverters for grid interface of renewable sources is presented to provide the necessary impedance models for system stability analysis. The effects of current control loop design and output filter configurations on the inverter output impedance are considered. A practical method to measure grid impedance using a frequency analyzer is presented, and the associated difficulties due to the presence of harmonics in the grid voltage are discussed. An example system involving a single-phase grid-connected inverter is presented to demonstrate the application of the proposed system analysis method.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130059322","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":"Active Fault Protection for High Power IGBTs","authors":"Lihua Chen, F. Peng","doi":"10.1109/APEC.2009.4802956","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802956","url":null,"abstract":"An active fault protection method is proposed to prevent the IGBTs from being damaged should they be under over-current and short circuit fault conditions. A closed-loop gate drive method is used to effectively control the IGBT turn-off switching speed independent of the fault type or resultant over-current level. Compared with conventional solutions, the proposed method can limit fault current level, minimize energy loss with fast shut down transient, and control voltage overshoot. Also, no additional hardware circuit or soft shut down process is need. Even if an over-current fault condition can not be effectively detected, the automatically controlled IGBT turn-off switching speed can avoid a dangerous voltage overshoot across the power device. This new feature can significantly improve the robustness of the power system and cannot be achieved with the conventional approaches.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134187306","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}
Yanping Yin, Xu Yang, Yongjiang Bai, Qiaoliang Chen, Li Jin, Zhaoan Wang
{"title":"A Novel Phase-shift Control Scheme for Interleaved Boost Converters Operating in Critical Conduction Mode","authors":"Yanping Yin, Xu Yang, Yongjiang Bai, Qiaoliang Chen, Li Jin, Zhaoan Wang","doi":"10.1109/APEC.2009.4802834","DOIUrl":"https://doi.org/10.1109/APEC.2009.4802834","url":null,"abstract":"Interleaving techniques are adopted to reduce input/output current or voltage ripples for converters with critical conduction mode. The paper studies and implements two types of phase-shift control schemes for critical interleaved boost PFC converters. Sub-harmonic oscillation phenomena occur at high line voltage when one of them is adopted. So this paper presents a quantitative analysis on the phenomena and proposes a novel phase-shift control scheme. Experimental results are presented in order to verify the feasibility and performance of the novel phase-shift control scheme.","PeriodicalId":200366,"journal":{"name":"2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134298426","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}