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Analysis and Experimental Verification of Reducing Intra-winding Capacitance in a Copper Foil Transformer 减小铜箔变压器绕组内电容的分析与实验验证
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124388
Rakesh Ramachandran, M. Nymand, Jesper Nielsen
{"title":"Analysis and Experimental Verification of Reducing Intra-winding Capacitance in a Copper Foil Transformer","authors":"Rakesh Ramachandran, M. Nymand, Jesper Nielsen","doi":"10.1109/APEC39645.2020.9124388","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124388","url":null,"abstract":"This paper demonstrates the reduction of intra-winding capacitance in a high efficiency copper foil transformer. High efficiency transformer have low ac-resistance and low leakage inductance due to extensive interleaving of the transformer winding. Often high interleaving in a transformer winding leads to an increase in the intra-winding capacitance. This paper analyze how to estimate the intra-winding capacitance in a copper foil transformer. Two transformers are designed for a 2.4 kW, 50 kHz isolated dc-dc converter and presented in this paper. By changing the winding configuration, the intra-winding capacitance of the transformer has been reduced from 692pF to 150pF without increasing the leakage inductance and the ac-resistance. Efficiency measurement for the 2.4 kW converter utilizing the proposed low intra-winding capacitance transformer is also presented in this paper.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114223147","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}
引用次数: 3
A New Modulation Strategy for Four-switch Buck-boost Converter with Reduced Freewheeling Current 减小自由流的四开关降压-升压变换器调制策略
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124107
Qi Liu, Qinsong Qian, Bowen Ren, Shen Xu, Weifeng Sun, Haisong Li
{"title":"A New Modulation Strategy for Four-switch Buck-boost Converter with Reduced Freewheeling Current","authors":"Qi Liu, Qinsong Qian, Bowen Ren, Shen Xu, Weifeng Sun, Haisong Li","doi":"10.1109/APEC39645.2020.9124107","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124107","url":null,"abstract":"A control method to achieve the minimum freewheeling current of the four-switch buck-boost (FSBB) converter is presented in this paper. Compared with the conventional method, the proposed method can make the best use of the energy stored in the junction capacitance of the boost stage to realize ZVS of the buck stage. Therefore, the soft-switching can be realized under the condition of the minimum freewheeling current and the efficiency is further improved. Based on the ZVS analysis, the minimum freewheeling current and the dead-time under different input conditions are determined. Moreover, the sampling circuit and the control parameter of the proposed method are also illustrated in this paper. Finally, the proposed method is verified on a 1MHz FSBB prototype.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114564002","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}
引用次数: 10
Computational Burden Reduction in Real-Time System Identification of Multi-Rail Power Converter by Re-using Covariance Matrix Approximation 基于协方差矩阵近似的多轨功率变换器实时系统识别计算量降低
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124314
Jin Xu, M. Armstrong, M. Al-Greer
{"title":"Computational Burden Reduction in Real-Time System Identification of Multi-Rail Power Converter by Re-using Covariance Matrix Approximation","authors":"Jin Xu, M. Armstrong, M. Al-Greer","doi":"10.1109/APEC39645.2020.9124314","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124314","url":null,"abstract":"This paper presents an approach to significantly reduce the computational burden of typical recursive algorithms used for real-time system identification. Recursive algorithms, such as Affine Projection (AP) and Recursive Least Square (RLS), contain two important updates per iteration cycle; the Covariance Matrix Approximation (CMA) update and the gradient vector (or cost function) update. Usually, the computational effort of updating CMA is much higher than that of updating gradient vector. Therefore, reusing CMA, calculated from the last iteration cycle, for the current iteration can result in computational cost savings for real-time system identification. This technique is particularly suitable for system identification-based adaptive control of complex power converter architectures suffering enormous computational burden. In the paper, this technique is applied for AP and RLS algorithms, for the purpose of identifying the parameters of a three-rail power converter.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"304 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116333283","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}
引用次数: 0
Performance Evaluation of Encoderless Control of Permanent Magnet Synchronous Machines using Predictive Current Observer Method 基于预测电流观测器的永磁同步电机无编码器控制性能评价
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124535
Kevin Lee, Yaojin Mo
{"title":"Performance Evaluation of Encoderless Control of Permanent Magnet Synchronous Machines using Predictive Current Observer Method","authors":"Kevin Lee, Yaojin Mo","doi":"10.1109/APEC39645.2020.9124535","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124535","url":null,"abstract":"Starting-up a position or speed sensorless permanent magnet synchronous machine (PMSM) under full load can be challenging. Because of the non-saliency characteristics in most surface mounted PMSMs, the high frequency injection (HFI) method which is effective in staring-up interior mounted PMSMs is invalid, unless significant saliency exists. Other starting methods include Volts/Hz control which is sensitive to load and machine parameters, and I-F control method. Like HFI, I-F method needs to be transitioned to other modes such as back- electromotive force (EMF) method when the motor speed reaches a certain threshold. Even though the predictive current method has been used in steady state operation, its PMSM starting characteristics have not been quantified in published literatures. This paper describes an encoderless control method based on an enhanced predictive current observer model for not only being able to startup a PMSM under full load smoothly, but also provide a stable operation in the wide speed range. Theoretical analysis including the predictive current observer structure, and simulation studies are presented to demonstrate the effectiveness from standstill to full speed under full load. Experimental results on a 15kW, 380V, 50Hz, 100Nm PMSM verify the feasibility of the analysis and design. The PMSM can accelerate from zero to rated speed of 1500r/min (RPM) smoothly at full load. The performance is repeatable at very low speed of 2Hz as well. In addition, the position tracking error is quantified when the PMSM parameters vary ±20% with stable operation, demonstrating the robustness of the solution in practical industry applications.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113979107","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}
引用次数: 0
Analysis of High Frequency AC Link Isolated Three Port Resonant Converter for UAV Applications 无人机用高频交流链路隔离三端口谐振变换器分析
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124438
Erdem Asa, K. Colak, D. Czarkowski, B. Ozpineci
{"title":"Analysis of High Frequency AC Link Isolated Three Port Resonant Converter for UAV Applications","authors":"Erdem Asa, K. Colak, D. Czarkowski, B. Ozpineci","doi":"10.1109/APEC39645.2020.9124438","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124438","url":null,"abstract":"A high frequency AC link isolated three port semi-bridgeless resonant converter is analyzed for unmanned aerial vehicle (UAV) applications in this study. The proposed topology is established by replacing rectifier lover diodes with synchronous switches. A phase shifted pulse width modulation (PS-PWM) technique adjusts bi-directional power flow between ports. Proposed control technique provides high efficiency by reducing switching losses with zero voltage switching (ZVS) and zero current switching (ZCS) in a wide power range regulation. Compared to integrated PWM converters in a bi-directional mode, the proposed topology reduces the number of converter stages and allows centralized control at high operating frequency. Theoretical and experimental results demonstrate the feasibility and effectiveness of the proposed converter at a full power of 500 W in laboratory conditions.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124382280","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}
引用次数: 4
Novel Methods for In-situ Direct Magnetic Loss Measurement in a DC-DC Converter DC-DC变换器原位直接磁损测量新方法
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124141
Lifang Yi, Jinyeong Moon
{"title":"Novel Methods for In-situ Direct Magnetic Loss Measurement in a DC-DC Converter","authors":"Lifang Yi, Jinyeong Moon","doi":"10.1109/APEC39645.2020.9124141","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124141","url":null,"abstract":"Timing skew between measurement channels can introduce an unacceptable error in power loss measurement, making in-situ magnetic loss measurement one of the most difficult engineering problems. This paper develops a mathematical model and provides two novel methods to realize insitu direct magnetic loss measurement. The mathematical model is first established to study the effects of timing skew on the measured/observed magnetic loss in a DC-DC converter. The first method, called Intersection method, is proposed and analyzed in detail. This method will illustrate how the actual timing skew and actual magnetic loss in circuit can be obtained with the aid of the mathematical model. The second method, called Derivative method, will be shown that it greatly enhances the accuracy and repeatability of the same measurements. The proposed methods are verified in simulation and experimentally validated in a conventional step-down DC-DC buck converter under various operating conditions and design parameters.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128041317","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}
引用次数: 1
Comparative Research on Compensation Controls for a Novel Three-Port Dynamic Voltage Restorer 一种新型三端口动态电压恢复器补偿控制的比较研究
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124347
Chenxing Sha, Jiangfeng Wang, Baolin Chen, Y. Xing, Hongfei Wu, Haibing Hu
{"title":"Comparative Research on Compensation Controls for a Novel Three-Port Dynamic Voltage Restorer","authors":"Chenxing Sha, Jiangfeng Wang, Baolin Chen, Y. Xing, Hongfei Wu, Haibing Hu","doi":"10.1109/APEC39645.2020.9124347","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124347","url":null,"abstract":"Dynamic voltage restorer (DVR) is an economical compensation device used to support grid voltage. A DC-DC converter is usually inserted to interface the energy storage with wide voltage range. However, the active power flows through two power conversion stages, which significantly reduces the efficiency. To address this issue, a three-port DVR (TPDVR) with dual DC ports is presented in this paper. As for the TPDVR, partial active power can be transferred within only one power conversion stage, thus increasing the efficiency. Compared with pre-sag control and in-phase control, minimum-energy control is always preferred for a DVR because it reduces the amount of active power needed from the DC-link. Nevertheless, once the sag is deep, the compensated voltage amplitude may be higher which claims higher DC-link voltage and the DC-DC converter cannot be avoided. Based on TPDVR, a detailed comparative research of different control strategies has been done. And the research shows that in-phase control is more suitable for TPDVR since it can restore grid voltage without using DC-DC converter over a wider range of sags. The characteristics of different controls for TPDVR are investigated and verified by experimental results.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125774308","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}
引用次数: 3
A Control Method for Smooth Transition from Motoring to Generating Modes in Switched Reluctance Machines 开关磁阻电机从电机模式平稳过渡到发电模式的控制方法
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124108
Okan Boler, Omer Gundogmus, Y. Sozer
{"title":"A Control Method for Smooth Transition from Motoring to Generating Modes in Switched Reluctance Machines","authors":"Okan Boler, Omer Gundogmus, Y. Sozer","doi":"10.1109/APEC39645.2020.9124108","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124108","url":null,"abstract":"This study presents a smooth transition algorithm to prevent the over currents in the phase windings of a switched reluctance machine (SRM) during transitions between motoring and generating modes. The proposed algorithm modifies the excitation angles of the SRM control during transitions by predicting the peak current of the phases for any operating conditions. Being applicable for a wide range of speed, the algorithm is discussed more for high speed operations due to the electromagnetic and mechanical dynamics of the SRMs. A Finite Element Analysis (FEA) of an 18/12 type SRM is utilized to develop its electromagnetic, circuit and mechanical models for the dynamic simulations. The performance of the proposed control algorithm is verified for various scenarios through the dynamic simulations.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127948858","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}
引用次数: 1
Soft Starting Strategy of Cascaded Dual Active Bridge Converter for High Power Isolated DC-DC Conversion 大功率隔离DC-DC转换级联双有源桥式变换器的软启动策略
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124400
Pengfei Yao, Xiaohua Jiang, FeiFred Wang
{"title":"Soft Starting Strategy of Cascaded Dual Active Bridge Converter for High Power Isolated DC-DC Conversion","authors":"Pengfei Yao, Xiaohua Jiang, FeiFred Wang","doi":"10.1109/APEC39645.2020.9124400","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124400","url":null,"abstract":"Dual active bridge (DAB) converter is promising in high power isolated dc-dc conversion applications. Soft starting of DAB converter is important to avoid current surge during starting and eliminate bulky external pre-charge circuits. A three step soft-starting strategy is proposed in this paper to simplify complex soft starting control, optimize charging speed, and reduce dc bias of transformer. The charging current and current stress are analyzed in detail. A suitable modulation strategy can be chosen that optimize pre-charge current, limit current stress and simplify control. Input voltage balance between cascaded modules can be achieved with the control of charging current. Transformer flux dc bias in soft-starting procedure is analyzed, and a control strategy is used to prevent transformer from saturated. The proposed soft starting strategy is verified by simulation in Matlab/Simulink, and is experimentally verified on a 300kW cascaded DAB converter prototype.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131937039","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}
引用次数: 3
Harmonic Current Depression for Medium Voltage Three-level Wind Power Converter with Active Damping Control 采用主动阻尼控制的中压三电平风电变流器谐波电流抑制
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI: 10.1109/APEC39645.2020.9124232
Zhijun Ma, Linyuan Zhou, Jinjun Liu
{"title":"Harmonic Current Depression for Medium Voltage Three-level Wind Power Converter with Active Damping Control","authors":"Zhijun Ma, Linyuan Zhou, Jinjun Liu","doi":"10.1109/APEC39645.2020.9124232","DOIUrl":"https://doi.org/10.1109/APEC39645.2020.9124232","url":null,"abstract":"Medium voltage three-level wind power converter is a good choice for the next generation 10-MW wind turbine. However, since switching frequency of medium voltage semiconductor device is strictly limited, harmonic current is hard to depress, especially for LCL type wind power converter. This paper presents an effective way to eliminate resonance current under low switching frequency. Active damping strategy, instead of passive damping, is adopted here. Detailed system model is built, which shows the converter harmonic terminal voltage, generated by the PWM section, introduces considerable the resonance harmonic current. To guarantee system stability, a negative proportion gain is used in the active damping feedback loop. According to the system model, a low pass filter is also adopted in the converter current feed-back loop, where harmonic current depression performance is greatly improved. Experimental results validate the theoretical analysis.","PeriodicalId":171455,"journal":{"name":"2020 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132029226","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}
引用次数: 1
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