{"title":"Electrical and Thermal Co-simulation Tool for LLC Converter","authors":"Yuqi Wei, Zhiqing Wang, Quanming Luo, A. Mantooth","doi":"10.1109/ECCE-Asia49820.2021.9479021","DOIUrl":"https://doi.org/10.1109/ECCE-Asia49820.2021.9479021","url":null,"abstract":"As one of the most popular isolated DC/DC converters, LLC resonant converter has found applications in many different industrial fields. Although traditional fundamental harmonic analysis (FHA) is widely adopted to analyze and design LLC resonant converter, high accuracy cannot be guaranteed, and considerable errors exist. Therefore, the driving force for this paper is to design an accurate LLC converter simulation tool, which including three aspects: 1) circuit model; 2) power loss model; 3) thermal model. These three aspects are closely related to each other. An accurate power loss model can only be obtained by using an accurate circuit model, and an accurate thermal model requires an accurate power loss model. Detailed discussions and comparisons for each model are presented in this paper. With the aid of the designed electrical and thermal simulation tool, analyzing and designing LLC resonant converter becomes convenient and time efficient. Meanwhile, education purpose of this paper is also of great importance, beginners could have a comprehensive understanding of an LLC resonant converter from circuit, power loss, and thermal perspectives.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130451332","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}
Zhi Bie, Jiantao Zhang, De'an Wang, K. Qian, Kai Song, Chunbo Zhu
{"title":"Area Expandable Wireless Charging System Using Multi-Inverter Array Type Transmitting Coils","authors":"Zhi Bie, Jiantao Zhang, De'an Wang, K. Qian, Kai Song, Chunbo Zhu","doi":"10.1109/ecce-asia49820.2021.9479000","DOIUrl":"https://doi.org/10.1109/ecce-asia49820.2021.9479000","url":null,"abstract":"This paper proposes a wireless charging system based on multi-inverter array type transmitting coils to solve the transmission power drop caused by the randomness of the receiver. Through the overlapping array arrangement of the transmitting coils and the switching of the transmitting coils, the mutual inductance between the receiving coil and the transmitting coil is kept stable in a more extensive range. In the case of using four transmitting coils, at the height of 100mm, the mutual inductance is reduced by less than 15% within the range of 880mm×880mm. The parallel resonant cavity is constructed by using the inverters of non-working coils to solve the problem caused by the mutual coupling between the transmitting coils.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127880031","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}
Xiongfeng Fang, Zeyu Hu, Yongfei Xing, Dongyu Wang, J. Xiong, Kai Zhang
{"title":"A DC Fault Current Limiting Method for HB-MMC Without Losing Control of AC Currents","authors":"Xiongfeng Fang, Zeyu Hu, Yongfei Xing, Dongyu Wang, J. Xiong, Kai Zhang","doi":"10.1109/ECCE-Asia49820.2021.9479364","DOIUrl":"https://doi.org/10.1109/ECCE-Asia49820.2021.9479364","url":null,"abstract":"Employing converters to limit the dc fault current is a good choice. By reducing the dc voltage, the fault current can be limited. Modular multilevel converters (MMCs) based on half-bridge submodules (HBSMs) are widely employed in high voltage direct current (HVDC) transmission systems. Most of the existing methods for HB-MMC to limit the dc fault current are at the cost of reducing the ac output voltage, which will lose control of ac currents and increase the ac grid's instability. A dc fault current limiting method for HB-MMC is proposed in this paper. The ac output voltage is not reduced during the dc fault current limiting period. Thus, the method will not disturb the ac grid. The common-mode voltage of each arm decides the dc voltage of HB-MMC. Common-mode voltages of the three phases are controlled separately to realize a significant current limiting effect. To avoid the arm overcurrent caused by increasing circuiting currents, the minimum common-mode voltage among the three phases is limited.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127962680","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":"A Novel Centralized Islanding Detection Scheme Using Teager-Kaiser Energy of Distribution-Level Synchrophasors","authors":"Kapil Chauhan, Ranjana Sodhi","doi":"10.1109/ECCE-Asia49820.2021.9479403","DOIUrl":"https://doi.org/10.1109/ECCE-Asia49820.2021.9479403","url":null,"abstract":"This paper proposes a novel Centralized Islanding Detector (CID) based on the synchrophasor data collected by the Distribution-level Phasor Measurement Unit (DPMU). The Teager-Kaiser energy of voltage phase angle difference between DG bus and reference substation bus is utilized as a key indicator to differentiate between Islanding and non-Islanding events. The efficacy of the proposed method is verified on a modified IEEE 33 bus test-system under various test scenarios such as loss of mains, single/multiple DG Island with zero/non-zero power mismatch, load shedding, capacitor switching, faults, motor starting, etc. Furthermore, superiority of the proposed method with other centralized Islanding detection schemes in terms of parameter selection, detection time, computational complexity and non detection zone is elaborated. The proposed indicator can work in accordance with advance distribution management system for wide-area situational awareness.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121300978","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}
Zeyu Hu, Xiongfeng Fang, Dongyu Wang, J. Xiong, Kai Zhang
{"title":"Double-Vector-Based Sequential Model Predictive Torque Control of Induction Motor","authors":"Zeyu Hu, Xiongfeng Fang, Dongyu Wang, J. Xiong, Kai Zhang","doi":"10.1109/ECCE-Asia49820.2021.9479047","DOIUrl":"https://doi.org/10.1109/ECCE-Asia49820.2021.9479047","url":null,"abstract":"Sequential model predictive torque control (SMPTC) has attracted wide attention because the weighting factor is eliminated. However, since only one voltage vector is applied in each control period, the torque ripple is large. To solve this problem, this paper proposes a double-vector-based sequential model predictive torque control (DSMPTC). In DSMPTC, when there are new voltage vectors among the combined voltage vectors, two voltage vectors are applied in one control period, otherwise, only one voltage vector is applied in one control period. The durations of voltage vectors are determined by torque deadbeat theory. The number of new voltage vectors is determined with a geometric method. The influence of the combined voltage vector sequence on the torque ripple and switching frequency is discussed. The simulation is carried out to verify the correctness of the proposed methods and conclusions. The simulation results show that the dynamic performance of DSMPTC is generally the same as SMPTC, while the steady-state performance of DSMPTC is greatly improved compared with SMPTC.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121420889","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":"Optimal Design of Battery Charging Converters Based on Energy Efficiency","authors":"Shubham Dhiman, K. Vasudevan","doi":"10.1109/ECCE-Asia49820.2021.9479355","DOIUrl":"https://doi.org/10.1109/ECCE-Asia49820.2021.9479355","url":null,"abstract":"In pursuit of efficient battery charging systems, zero-voltage switching phase shift full bridge (ZVS-PSFB) converter topology has been widely used for medium to high power levels. Also, there are zero-voltage zero-current switching (ZVZCS) techniques that implement secondary side passive auxiliary circuits and reduce the conduction loss in semiconductor devices resulting in better efficiency. However, battery charging is a nonlinear load where the power converter operates from heavy load to light load. In such operations, a power converter can be considered more efficient if it consumes less energy in a charging cycle rather than a high peak efficiency at a particular load. The aim of this paper is to investigate such an approach. The basic phase shift full bridge (PSFB) circuit and two efficiency improvement variants proposed in the literature (ZVZCS-PSFB) are considered for the study. An analytical approach is considered for estimating the losses over a full charging cycle. Rating of the battery charger considered is 40V-130V, 5kW. The study confirms the premise that higher efficiencies in certain load conditions is not a sufficient consideration in the design of battery charging converters. Simulation study is carried out in MATLAB/Simulink environment.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"30 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114118621","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":"Universal Smart Power Module Concept with High-speed Controller for Simplification of Power Conversion System Design","authors":"Koki Yamanokuchi, Hiroki Watanabe, Jun-ichi Itoh","doi":"10.1109/ECCE-Asia49820.2021.9478978","DOIUrl":"https://doi.org/10.1109/ECCE-Asia49820.2021.9478978","url":null,"abstract":"This paper proposes the modular power conversion systems based on an Universal Smart Power Module (USPM). In this concept, the Power Electronics Building Block (PEBB) is improved the flexibility and the expandability by integrating a high-speed power electronics controller, input/output filters among each USPM to realize the simplification of the power electronics design. The original point of USPM is that each power module operates independently because a high-speed power electronics controller is implemented on each power module. The power modules of PEBB are typically configured by the main power circuits and the gate driver. Therefore, the controller has to be designed specifically according to various applications although the advantages of PEBB are high flexibility and user-friendly. The contribution of USPM is the simplification of the system design including power electronics controller. On the other hand, autonomous distributed systems require the control method to suppress the interference in each module. In this paper, the configuration of USPM, example of the USPM system, and detail of the control method are introduced.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"57 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114124066","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 of Intermittent Control for Triple Active Bridge Converter to Suppress Cross-current","authors":"Takanobu Ohno, N. Hoshi","doi":"10.1109/ECCE-Asia49820.2021.9479013","DOIUrl":"https://doi.org/10.1109/ECCE-Asia49820.2021.9479013","url":null,"abstract":"Reactive power is transmitted between the power supplies connected with a three-winding transformer of Triple Active Bridge DC/DC converter controlled with conventional phase-shift control. This paper proposes a novel control method based on intermittent control to reduce the cross-current that causes reactive power transmission. In the proposed method, by intermittently turning off all gates of the active bridge connected to the power supply, the remaining two active bridges operate equivalently to Dual Active Bridge DC/DC converter. This method can reduce the reactive power, especially under the conditions where the power distribution of the power supplies is different. Also, this paper describes the experimental results of a 2 kW prototype TAB converter to verify the validity of the proposed method. As a result, it was confirmed that the entire power conversion efficiency was improved by up to 2.5 pt due to suppression of the cross-current.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114177287","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}
I. Aharon, Y. Shalom, Y. Dromi, A. Shemaryahu, J. Bernstein
{"title":"GaN based Ring Oscillator PWM Generator","authors":"I. Aharon, Y. Shalom, Y. Dromi, A. Shemaryahu, J. Bernstein","doi":"10.1109/ECCE-Asia49820.2021.9479141","DOIUrl":"https://doi.org/10.1109/ECCE-Asia49820.2021.9479141","url":null,"abstract":"The Pulsed width modulator is a fundamental circuit in any electronic power converter. In this paper a new topology for pulsed width modulator based on Gallium Nitride transistors is presented. First the circuit is analyzed for allowing the control of the switching frequency operation and the control of the on and off time. The proposed theory is validated by simulation and experiment. The results show that the proposed ring oscillator circuit is capable of being employed as a self-oscillating pulse width modulator even for very high frequency power converter.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"15 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120900462","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":"Rapid prediction of the state of charge and health of retired power batteries based on electrochemical impedance spectroscopy","authors":"Fan Luo, Haihong Huang","doi":"10.1109/ecce-asia49820.2021.9479375","DOIUrl":"https://doi.org/10.1109/ecce-asia49820.2021.9479375","url":null,"abstract":"Aiming at the problems of long time, low accuracy and high energy consumption in detecting the health status of retired power batteries at this stage, a rapid prediction method of battery state of charge (SOC) and state of health (SOH) based on electrochemical impedance spectroscopy (EIS) is proposed. First, through electrochemical impedance spectroscopy measurements of multiple retired power batteries with different SOHs at different SOCs and different temperatures, the relationship between impedance amplitude, phase angle and the equivalent circuit model parameters obtained by fitting and SOC at different temperatures are analyzed. Then, based on this, find the most stable impedance parameter to establish the battery SOC estimation algorithm to realize the rapid estimation of the SOC of the retired power battery;Finally, the EIS twice measurement method is proposed to quickly predict the state of charge and health of the retired power battery, and the minimum error of the verification experimental results is less than 1%. Using this method can greatly reduce test time, save energy, and achieve rapid estimation of unknown state of charge and health of the battery.","PeriodicalId":145366,"journal":{"name":"2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116144205","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}