Pub Date : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579210
Hongchang Li, Xu Yang, Kangping Wang, X. Dong
Wireless Power Transfer (WPT) brings convenience and safety in many applications and serves as a research hot spot in recently years. Magnetic resonant coupling is widely implemented in WPT applications such as mobile devices and electric vehicles where large distance, large power amount and high efficiency are the three key requirements in real application. However, there are always trade-offs between these requirements even in theory. Former literatures failed to illustrate the complete relationships between these requirements. Based on the phasor analysis, this paper illustrates the operating principle of the whole circuit, attains the equivalent circuit models of the system and derives the physical essence of frequency characteristics. Then Maximum Efficiency Conditions (MEC), which achieves the maximum efficiency without sacrificing the requirements for power transfer distance and power amount, is summarized. It should be noted that the highest efficiency is achieved at the natural frequency of the receiver, instead of any split frequencies of the coupled resonances. Following the MEC, a WPT prototype was designed, which was composed of a full bridge inverter, a LC resonant transmitter, a LC resonant receiver and a full bridge rectifier. The resonant frequency of the transmitter was designed to be slightly lower than the inverter operation frequency-446 kHz to make an inductive load for the inverter so that all the MOSFETs operated in Zero-Voltage-Switching (ZVS) condition. For the experimental results, 300 W output power was obtained over a distance of 22 cm with 84% overall efficiency.
{"title":"Study on efficiency maximization design principles for Wireless Power Transfer system using magnetic resonant coupling","authors":"Hongchang Li, Xu Yang, Kangping Wang, X. Dong","doi":"10.1109/ECCE-ASIA.2013.6579210","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579210","url":null,"abstract":"Wireless Power Transfer (WPT) brings convenience and safety in many applications and serves as a research hot spot in recently years. Magnetic resonant coupling is widely implemented in WPT applications such as mobile devices and electric vehicles where large distance, large power amount and high efficiency are the three key requirements in real application. However, there are always trade-offs between these requirements even in theory. Former literatures failed to illustrate the complete relationships between these requirements. Based on the phasor analysis, this paper illustrates the operating principle of the whole circuit, attains the equivalent circuit models of the system and derives the physical essence of frequency characteristics. Then Maximum Efficiency Conditions (MEC), which achieves the maximum efficiency without sacrificing the requirements for power transfer distance and power amount, is summarized. It should be noted that the highest efficiency is achieved at the natural frequency of the receiver, instead of any split frequencies of the coupled resonances. Following the MEC, a WPT prototype was designed, which was composed of a full bridge inverter, a LC resonant transmitter, a LC resonant receiver and a full bridge rectifier. The resonant frequency of the transmitter was designed to be slightly lower than the inverter operation frequency-446 kHz to make an inductive load for the inverter so that all the MOSFETs operated in Zero-Voltage-Switching (ZVS) condition. For the experimental results, 300 W output power was obtained over a distance of 22 cm with 84% overall efficiency.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134508115","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579149
D. Sato, J. Itoh
In this paper, the losses of a drive system for electric vehicles (EVs) which consists of the interior permanent magnet synchronous motor (IPMSM) is analyzed. The applied power converter is distinguished into a 2-level inverter and a 3-level inverter, respectively. In addition, two modulations are applied typically in the inverter, known as Pulse width modulation (PWM) at low speed region and 1-pulse modulation (square wave modulation) at middle or high speed regions. This paper discusses the appropriate interchange point between these modulations in order to achieve minimum loss, by analyzing and comparing the losses for each of the inverter. The total loss is divided into the inverter loss and motor loss, where the inverter loss is calculated by the simulation and the motor loss is analyzed by two-dimensional finite element method (2D-FEM). As a result, the total loss which is composed of the 3-level inverter and the motor losses are shown lower than that of the 2-level inverter. The losses of the 3-level inverter decreases by 5.8% compared to that of the 2-level inverter at base speed. In addition, when the carrier frequency is 5 kHz, the loss of the motor drive system achieves the smallest. Furthermore, the losses of the motor drive system are evaluated by the experiment. According to the results, the high efficiency can be achieved by 1'pulse modulation.
{"title":"Total loss comparison of inverter circuit topologies with interior permanent magnet synchronous motor drive system","authors":"D. Sato, J. Itoh","doi":"10.1109/ECCE-ASIA.2013.6579149","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579149","url":null,"abstract":"In this paper, the losses of a drive system for electric vehicles (EVs) which consists of the interior permanent magnet synchronous motor (IPMSM) is analyzed. The applied power converter is distinguished into a 2-level inverter and a 3-level inverter, respectively. In addition, two modulations are applied typically in the inverter, known as Pulse width modulation (PWM) at low speed region and 1-pulse modulation (square wave modulation) at middle or high speed regions. This paper discusses the appropriate interchange point between these modulations in order to achieve minimum loss, by analyzing and comparing the losses for each of the inverter. The total loss is divided into the inverter loss and motor loss, where the inverter loss is calculated by the simulation and the motor loss is analyzed by two-dimensional finite element method (2D-FEM). As a result, the total loss which is composed of the 3-level inverter and the motor losses are shown lower than that of the 2-level inverter. The losses of the 3-level inverter decreases by 5.8% compared to that of the 2-level inverter at base speed. In addition, when the carrier frequency is 5 kHz, the loss of the motor drive system achieves the smallest. Furthermore, the losses of the motor drive system are evaluated by the experiment. According to the results, the high efficiency can be achieved by 1'pulse modulation.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"358 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133198542","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579232
Xuning Zhang, D. Boroyevich, R. Burgos, P. Mattavelli, Fred Wang
This paper presents a detailed analysis on the impact of dead time (DT) on the EMI performance of three-level neutral-point-clamping (3L-NPC) inverters with Common Mode Elimination (CME) modulation. The implementation method of CME modulation is presented and the benefits and drawbacks are discussed which shows that the benefit of CME modulation is highly related with the DT added to the system and make it less practical in a real system. By analyzing the switching states of one phase leg, the impacts of DT on CM voltage are discussed in detail. Based on this analysis, a DT compensation method for CME modulations is proposed, where the position of the compensated pulses need to be considered carefully to achieve both CM voltage reduction and the current distortion minimization. Both simulation and experimental verification are implemented to verify the analysis based on a 2.5 kW prototype and the results match well with the analysis and verify the proposed method.
{"title":"Impact and compensation of dead time on common mode voltage elimination modulation for neutral-point-clamped three-phase inverters","authors":"Xuning Zhang, D. Boroyevich, R. Burgos, P. Mattavelli, Fred Wang","doi":"10.1109/ECCE-ASIA.2013.6579232","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579232","url":null,"abstract":"This paper presents a detailed analysis on the impact of dead time (DT) on the EMI performance of three-level neutral-point-clamping (3L-NPC) inverters with Common Mode Elimination (CME) modulation. The implementation method of CME modulation is presented and the benefits and drawbacks are discussed which shows that the benefit of CME modulation is highly related with the DT added to the system and make it less practical in a real system. By analyzing the switching states of one phase leg, the impacts of DT on CM voltage are discussed in detail. Based on this analysis, a DT compensation method for CME modulations is proposed, where the position of the compensated pulses need to be considered carefully to achieve both CM voltage reduction and the current distortion minimization. Both simulation and experimental verification are implemented to verify the analysis based on a 2.5 kW prototype and the results match well with the analysis and verify the proposed method.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122366789","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579263
R. Aguilera, D. Quevedo, S. Vazquez, L. Franquelo
Predictive-Direct Power Control (P-DPC) is an attractive predictive control technique for AC/DC converters. This control strategy considers a dynamic power model of converter to forecast possible future converter behaviours. Thus, P-DPC provides an optimal switching pattern in order to directly control the active and reactive powers. Nevertheless, as will be shown in this work, this control method limits the converter operation range to a small power angle. In this work, we propose an improved P-DPC strategy, which allows one to extend the power angle operation range of an AC/DC converter while improving its power quality.
{"title":"Generalized Predictive Direct Power Control for AC/DC converters","authors":"R. Aguilera, D. Quevedo, S. Vazquez, L. Franquelo","doi":"10.1109/ECCE-ASIA.2013.6579263","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579263","url":null,"abstract":"Predictive-Direct Power Control (P-DPC) is an attractive predictive control technique for AC/DC converters. This control strategy considers a dynamic power model of converter to forecast possible future converter behaviours. Thus, P-DPC provides an optimal switching pattern in order to directly control the active and reactive powers. Nevertheless, as will be shown in this work, this control method limits the converter operation range to a small power angle. In this work, we propose an improved P-DPC strategy, which allows one to extend the power angle operation range of an AC/DC converter while improving its power quality.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130211697","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579152
Taekyun Kim, M. Jang, V. Agelidis
In recent years, commercial-grade silicon carbide (SiC) power semiconductor devices have shown promise to deliver the next generation of SiC-based power electronic converters operating at higher temperature/frequencies when compared with performances achieved by Si-based counterparts. This paper compares different types of SiC semiconductor devices, commercially available at present time. The performance of photovoltaic (PV) prototype converters, reported so far in the technical literature, utilizing SiC technologies and their potential and limitations are also analysed and reported. To fully exploit superior electrical and thermal properties of SiC devices in PV converters, technology directions with respect to converter characteristics and performance possibilities are discussed.
{"title":"Current status of silicon carbide power devices and their application in photovoltaic converters","authors":"Taekyun Kim, M. Jang, V. Agelidis","doi":"10.1109/ECCE-ASIA.2013.6579152","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579152","url":null,"abstract":"In recent years, commercial-grade silicon carbide (SiC) power semiconductor devices have shown promise to deliver the next generation of SiC-based power electronic converters operating at higher temperature/frequencies when compared with performances achieved by Si-based counterparts. This paper compares different types of SiC semiconductor devices, commercially available at present time. The performance of photovoltaic (PV) prototype converters, reported so far in the technical literature, utilizing SiC technologies and their potential and limitations are also analysed and reported. To fully exploit superior electrical and thermal properties of SiC devices in PV converters, technology directions with respect to converter characteristics and performance possibilities are discussed.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126309736","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579285
Ahmad Bashar Ataji, Y. Miura, T. Ise, Hiroki Tanaka
In this paper the control system for variable speed grid-connected doubly-fed induction generator (DFIG) is addressed, which is dedicated for natural gas-fired generation system. The control system features active and reactive power controller, negative-sequence compensation controller, and rotor position phase locked loop (PLL). The proposed active and reactive power controller is independent of the DFIG parameters, while having good dynamical performance similar to that of the decoupled P-Q controller. The negative-sequence compensation controller improves the output power quality by eliminating the negative-sequence component in the stator current. The rotor position PLL achieves sensorless control. Simulation and experimental results are provided for a 1.1 kW prototype DFIG.
{"title":"Machine parameter independent control of a grid-connected variable speed doubly-fed induction generator for gas engine generation systems","authors":"Ahmad Bashar Ataji, Y. Miura, T. Ise, Hiroki Tanaka","doi":"10.1109/ECCE-ASIA.2013.6579285","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579285","url":null,"abstract":"In this paper the control system for variable speed grid-connected doubly-fed induction generator (DFIG) is addressed, which is dedicated for natural gas-fired generation system. The control system features active and reactive power controller, negative-sequence compensation controller, and rotor position phase locked loop (PLL). The proposed active and reactive power controller is independent of the DFIG parameters, while having good dynamical performance similar to that of the decoupled P-Q controller. The negative-sequence compensation controller improves the output power quality by eliminating the negative-sequence component in the stator current. The rotor position PLL achieves sensorless control. Simulation and experimental results are provided for a 1.1 kW prototype DFIG.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126362813","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579122
T. Ishibashi, M. Okamoto, E. Hiraki, Toshihiko Tanaka, T. Hashizume, T. Kachi
Wide bandgap semiconductors, such as silicon carbide (SiC) and gallium nitride (GaN), are promised materials for next-generation power devices. The authors have recently fabricated a GaN-based high-electron-mobility transistor (HEMT), which is a normally-on device, for power electronics application. However, the power consumption in the constructed gate drive circuit increases when the GaN HEMT is used under higher-frequency operation. A new gate drive circuit with lower power consumption for the normally-on GaN HEMT is strongly required. In this paper, a new resonant gate drive circuit, which is most suitable for the newly fabricated GaN HEMT, is proposed. The validity and high practicability of the proposed resonant gate drive circuit are demonstrated by simulation and experimental results.
{"title":"Resonant gate driver for normally-on GaN high-electron-mobility transistor","authors":"T. Ishibashi, M. Okamoto, E. Hiraki, Toshihiko Tanaka, T. Hashizume, T. Kachi","doi":"10.1109/ECCE-ASIA.2013.6579122","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579122","url":null,"abstract":"Wide bandgap semiconductors, such as silicon carbide (SiC) and gallium nitride (GaN), are promised materials for next-generation power devices. The authors have recently fabricated a GaN-based high-electron-mobility transistor (HEMT), which is a normally-on device, for power electronics application. However, the power consumption in the constructed gate drive circuit increases when the GaN HEMT is used under higher-frequency operation. A new gate drive circuit with lower power consumption for the normally-on GaN HEMT is strongly required. In this paper, a new resonant gate drive circuit, which is most suitable for the newly fabricated GaN HEMT, is proposed. The validity and high practicability of the proposed resonant gate drive circuit are demonstrated by simulation and experimental results.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128998298","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579175
F. Wei, D. Vilathgamuwa, S. S. Choi, Xinan Zhang
This paper proposes an improved control of rotor side and load side converters with repetitive control in order to compensate the harmonic components in the stator voltage and current of the doubly-fed induction generator (DFIG) when connected with non-linear loads. The non-linear loads results in distorted stator voltage and current with subsequent power quality degradation and electromagnetic torque pulsations of DFIGs. The distorted stator voltage and current are compensated by the proposed hybrid control scheme with repetitive control (RC) based PI controller (PIRC). The harmonic components of different orders and negative sequence component of the stator voltage can be rejected using a single PIRC while most of the other alternative harmonic compensators require separate controllers for damping these components. The PIRC is applied in rotor side converter (RSC) for the purpose of stator voltage compensation and in line side converter (LSC) for stator current compensation, respectively. The simulation results are given and they show that the PIRC control scheme can eliminate stator voltage and current harmonic of stand-alone DFIG effectively.
{"title":"Improved control of rotor- and load-side converters of stand-alone DFIGs under nonlinear loads conditions","authors":"F. Wei, D. Vilathgamuwa, S. S. Choi, Xinan Zhang","doi":"10.1109/ECCE-ASIA.2013.6579175","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579175","url":null,"abstract":"This paper proposes an improved control of rotor side and load side converters with repetitive control in order to compensate the harmonic components in the stator voltage and current of the doubly-fed induction generator (DFIG) when connected with non-linear loads. The non-linear loads results in distorted stator voltage and current with subsequent power quality degradation and electromagnetic torque pulsations of DFIGs. The distorted stator voltage and current are compensated by the proposed hybrid control scheme with repetitive control (RC) based PI controller (PIRC). The harmonic components of different orders and negative sequence component of the stator voltage can be rejected using a single PIRC while most of the other alternative harmonic compensators require separate controllers for damping these components. The PIRC is applied in rotor side converter (RSC) for the purpose of stator voltage compensation and in line side converter (LSC) for stator current compensation, respectively. The simulation results are given and they show that the PIRC control scheme can eliminate stator voltage and current harmonic of stand-alone DFIG effectively.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127576193","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579230
Jong-Woo Kim, Duk-You Kim, Chong-Eun Kim, Jae-Hyun Kim, G. Moon
This paper proposes to disable standby converter for improving the efficiency of a server computer power supply. By disabling the standby flyback converter after DC/DC stage is turned on, losses in standby flyback converter are removed in normal mode. When it is disabled, all outputs of the standby flyback converter are provided by phase-shifted full-bridge (PSFB) converter, so that the PSFB converter operates by itself. Since PSFB converter has much higher efficiency than the standby flyback converter, the system efficiency can be improved in the entire load condition. The feasibility of the proposed structure has been verified with 90-265Vrms, 400V link voltage, 12V/62.5A main output, and 12V/2.1A standby output server power system.
{"title":"Disabling standby converter with phase-shifted full-bridge converter in server power supplies","authors":"Jong-Woo Kim, Duk-You Kim, Chong-Eun Kim, Jae-Hyun Kim, G. Moon","doi":"10.1109/ECCE-ASIA.2013.6579230","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579230","url":null,"abstract":"This paper proposes to disable standby converter for improving the efficiency of a server computer power supply. By disabling the standby flyback converter after DC/DC stage is turned on, losses in standby flyback converter are removed in normal mode. When it is disabled, all outputs of the standby flyback converter are provided by phase-shifted full-bridge (PSFB) converter, so that the PSFB converter operates by itself. Since PSFB converter has much higher efficiency than the standby flyback converter, the system efficiency can be improved in the entire load condition. The feasibility of the proposed structure has been verified with 90-265Vrms, 400V link voltage, 12V/62.5A main output, and 12V/2.1A standby output server power system.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127875730","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579166
Xiaojie Shi, Zhiqiang Wang, L. Tolbert, Fred Wang
This paper deals with the system structure and operating principle of a modular multilevel converter (MMC) with integrated arm inductors for improved performance. The proposed integrated inductors provide inductances not only for circulating current suppression, but also for switching ripple mitigation. Compared with the conventional MMC structure implemented with two separate inductors connected in both upper and lower arms by two magnetic cores, only one core is required for the arm inductor of each phase. Hence, the overall size, weight, and cost of magnetic components will be much lower than discrete ones. In addition, the relationships between the number of voltage levels, the equivalent differential inductance of the integrated inductor, and the total harmonic distortion (THD) of the phase voltage is analyzed based on the designed integrated inductor. Without differential inductance, the number of voltage levels should be more than 12 with N+1 phase shift PWM (PSPWM) or 8 with 2N+1 PSPWM to bring the THD below 5 %, while this goal can be achieved by 4 sub-modules MMC with only 2 mH differential mode (DM) inductance if N+1 modulation is applied, or 0.5 mH DM inductance if 2N+1 modulation is adopted. Simulation results for a three-phase inverter system are provided to support the theoretical considerations.
{"title":"Modular multilevel converters with integrated arm inductors for high quality current waveforms","authors":"Xiaojie Shi, Zhiqiang Wang, L. Tolbert, Fred Wang","doi":"10.1109/ECCE-ASIA.2013.6579166","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579166","url":null,"abstract":"This paper deals with the system structure and operating principle of a modular multilevel converter (MMC) with integrated arm inductors for improved performance. The proposed integrated inductors provide inductances not only for circulating current suppression, but also for switching ripple mitigation. Compared with the conventional MMC structure implemented with two separate inductors connected in both upper and lower arms by two magnetic cores, only one core is required for the arm inductor of each phase. Hence, the overall size, weight, and cost of magnetic components will be much lower than discrete ones. In addition, the relationships between the number of voltage levels, the equivalent differential inductance of the integrated inductor, and the total harmonic distortion (THD) of the phase voltage is analyzed based on the designed integrated inductor. Without differential inductance, the number of voltage levels should be more than 12 with N+1 phase shift PWM (PSPWM) or 8 with 2N+1 PSPWM to bring the THD below 5 %, while this goal can be achieved by 4 sub-modules MMC with only 2 mH differential mode (DM) inductance if N+1 modulation is applied, or 0.5 mH DM inductance if 2N+1 modulation is adopted. Simulation results for a three-phase inverter system are provided to support the theoretical considerations.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123245578","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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