Pub Date : 2020-10-11DOI: 10.1109/ECCE44975.2020.9236148
M. Haider, M. Guacci, D. Bortis, J. Kolar, Y. Ono
State-of-the-art variable speed drive inverter systems are typically employing 1200 V Si IGBTs with antiparallel freewheeling diodes, resulting in a large overall semiconductor chip area, relatively high switching losses and/or low switching frequencies, and causing a substantial on-state voltage drop in both current directions, which inherently limits the peak and part-load efficiency. SiC MOSFETs are seen as natural future replacement of Si IGBTs, since they benefit from high switching speeds and low on-state resistances, which drastically reduces switching and conduction losses. However, the high switching speed of SiC devices results in a dv/dt-stress on the motor windings of up to 60...80 V/ns, which must be limited to 3...6 V/ns in order to prevent partial discharge phenomena and/or progressive insulation aging. Full sinewave filtering could solve this issue, but would also reduce the achievable performance improvement, as a higher switching frequency and/or a bulky filter would be required. Therefore, this paper comparatively evaluates different dv/dt-limitation approaches proposed in literature, i.e. active, hybrid and passive filter concepts, for a next generation 10kW SiC PWM inverter supplied from an 800V DC-bus. First, the different filter concepts are described and analyzed, and in a second step their design procedure is explained based on the design space approach. Afterwards, a Pareto optimization is conducted and Pareto optimal designs are selected, evaluated and compared regarding efficiency and power density. All considered filter designs outperform a state-of-the-art typically 98.3% efficient IGBT inverter drive. The hybrid filter enables a part-load (at 8 kW) efficiency of 99.0% for a dv/dt limited to 6 V/ns. If higher dv/dt -values can be tolerated, e.g. 12 V/ns, 99.3% part-load efficiency with a power density above 80 kW/L can be achieved by the active concept.
最先进的变速驱动逆变系统通常采用1200 V Si igbt和反平行自由旋转二极管，导致整体半导体芯片面积大，相对较高的开关损耗和/或低开关频率，并导致两个电流方向上的大量导通状态电压下降，这固有地限制了峰值和部分负载效率。SiC mosfet被视为Si igbt的自然替代品，因为它们受益于高开关速度和低导通状态电阻，从而大大降低了开关和传导损失。然而，SiC器件的高开关速度导致电机绕组上的dv/dt应力高达60…80V/ns，必须限制在3V/ns，以防止局部放电现象和/或逐渐老化的绝缘。全正弦波滤波可以解决这个问题，但也会降低可实现的性能改进，因为需要更高的开关频率和/或笨重的滤波器。因此，本文比较评估了文献中提出的不同dv/dt限制方法，即有源、混合和无源滤波器概念，用于由800V直流母线供电的下一代10kW SiC PWM逆变器。首先，描述和分析了不同的滤波器概念，第二步，基于设计空间方法解释了它们的设计过程。然后进行帕累托优化，从效率和功率密度两个方面对帕累托最优设计进行选择、评价和比较。所有考虑的滤波器设计都优于最先进的典型98.3%效率的IGBT逆变器驱动器。混合滤波器在dv/dt限制为6 V/ns的情况下，使部分负载(8 kW)效率达到99.0%。如果可以容忍更高的dv/dt值，例如12 V/ns，则可以通过有源概念实现功率密度高于80 kW/L的部分负载效率达到99.3%。
{"title":"Analysis and Evaluation of Active/Hybrid/Passive dv/dt-Filter Concepts for Next Generation SiC-Based Variable Speed Drive Inverter Systems","authors":"M. Haider, M. Guacci, D. Bortis, J. Kolar, Y. Ono","doi":"10.1109/ECCE44975.2020.9236148","DOIUrl":"https://doi.org/10.1109/ECCE44975.2020.9236148","url":null,"abstract":"State-of-the-art variable speed drive inverter systems are typically employing 1200 V Si IGBTs with antiparallel freewheeling diodes, resulting in a large overall semiconductor chip area, relatively high switching losses and/or low switching frequencies, and causing a substantial on-state voltage drop in both current directions, which inherently limits the peak and part-load efficiency. SiC MOSFETs are seen as natural future replacement of Si IGBTs, since they benefit from high switching speeds and low on-state resistances, which drastically reduces switching and conduction losses. However, the high switching speed of SiC devices results in a dv/dt-stress on the motor windings of up to 60...80 V/ns, which must be limited to 3...6 V/ns in order to prevent partial discharge phenomena and/or progressive insulation aging. Full sinewave filtering could solve this issue, but would also reduce the achievable performance improvement, as a higher switching frequency and/or a bulky filter would be required. Therefore, this paper comparatively evaluates different dv/dt-limitation approaches proposed in literature, i.e. active, hybrid and passive filter concepts, for a next generation 10kW SiC PWM inverter supplied from an 800V DC-bus. First, the different filter concepts are described and analyzed, and in a second step their design procedure is explained based on the design space approach. Afterwards, a Pareto optimization is conducted and Pareto optimal designs are selected, evaluated and compared regarding efficiency and power density. All considered filter designs outperform a state-of-the-art typically 98.3% efficient IGBT inverter drive. The hybrid filter enables a part-load (at 8 kW) efficiency of 99.0% for a dv/dt limited to 6 V/ns. If higher dv/dt -values can be tolerated, e.g. 12 V/ns, 99.3% part-load efficiency with a power density above 80 kW/L can be achieved by the active concept.","PeriodicalId":433712,"journal":{"name":"2020 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132581765","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 : 2020-10-11DOI: 10.1109/ECCE44975.2020.9235985
Zhicheng Guo, Soumik Sen, S. Rajendran, Qingyun Huang, Xianyong Feng, A. Huang
This paper presents the design of a 200-kW medium-frequency transformer (MFT) based on low loss magnetic core (FINEMET® FT-3TL). Parallel-concentric winding structure is utilized to increase the current carrying capability and reduce the leakage inductance. Based on the parallel-concentric winding concept, a novel insulation structure with two-layer 3D printed bobbins is further proposed. The developed MFT achieves a power density higher than 19 kW/L. The electrical insulation system is tested at AC peak 14 kV voltage and DC 25kV voltage. In addition, the partial discharge test is conducted at AC 8.5kV peak voltage to ensure a partial discharge (PD)-free design. Finally, the MFT is applied to a medium voltage solid-state transformer (SST) to verify the design.
{"title":"Design of a 200 kW Medium-Frequency Transformer (MFT) With High Insulation Capability","authors":"Zhicheng Guo, Soumik Sen, S. Rajendran, Qingyun Huang, Xianyong Feng, A. Huang","doi":"10.1109/ECCE44975.2020.9235985","DOIUrl":"https://doi.org/10.1109/ECCE44975.2020.9235985","url":null,"abstract":"This paper presents the design of a 200-kW medium-frequency transformer (MFT) based on low loss magnetic core (FINEMET® FT-3TL). Parallel-concentric winding structure is utilized to increase the current carrying capability and reduce the leakage inductance. Based on the parallel-concentric winding concept, a novel insulation structure with two-layer 3D printed bobbins is further proposed. The developed MFT achieves a power density higher than 19 kW/L. The electrical insulation system is tested at AC peak 14 kV voltage and DC 25kV voltage. In addition, the partial discharge test is conducted at AC 8.5kV peak voltage to ensure a partial discharge (PD)-free design. Finally, the MFT is applied to a medium voltage solid-state transformer (SST) to verify the design.","PeriodicalId":433712,"journal":{"name":"2020 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128897638","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 : 2020-10-11DOI: 10.1109/ECCE44975.2020.9235414
Jianghui Yu, R. Burgos
Converters having Integrated Capacitor Blocked Transistor (ICBT) cells provide a new method to transfer high power in medium voltage or high voltage systems. One ICBT cell operates as a single switching device, series-connected ICBT cells operate as a single high-voltage device without suffering from large additional losses or the requirement of fast balancing controls. Converters with ICBT cells have the modularity and scalability like Modular Multilevel Converters but require much lower cell capacitances. The operation of converters with ICBT cells are analyzed. Different switching states and commutation sequences are presented. Based on the results, control methods are proposed to achieve desired converter outputs, low cell capacitor voltage ripples and cell capacitor voltage balance. The operation and control of converters having ICBT cells are demonstrated by simulation results in PLECS and LTspice.
{"title":"Operation and Control of Converters Having Integrated Capacitor Blocked Transistor Cells","authors":"Jianghui Yu, R. Burgos","doi":"10.1109/ECCE44975.2020.9235414","DOIUrl":"https://doi.org/10.1109/ECCE44975.2020.9235414","url":null,"abstract":"Converters having Integrated Capacitor Blocked Transistor (ICBT) cells provide a new method to transfer high power in medium voltage or high voltage systems. One ICBT cell operates as a single switching device, series-connected ICBT cells operate as a single high-voltage device without suffering from large additional losses or the requirement of fast balancing controls. Converters with ICBT cells have the modularity and scalability like Modular Multilevel Converters but require much lower cell capacitances. The operation of converters with ICBT cells are analyzed. Different switching states and commutation sequences are presented. Based on the results, control methods are proposed to achieve desired converter outputs, low cell capacitor voltage ripples and cell capacitor voltage balance. The operation and control of converters having ICBT cells are demonstrated by simulation results in PLECS and LTspice.","PeriodicalId":433712,"journal":{"name":"2020 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133771947","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 : 2020-10-11DOI: 10.1109/ECCE44975.2020.9235674
Lu Yue, M. Saeed, Inhwan Lee, Xiu Yao
One major challenge regarding series-connected IGBTs is the protection against over-current faults, besides voltage balancing among the devices. In this paper, an over-current protection method based on desaturation detection is proposed for series-connected IGBTs which are controlled by a digital signal processor (DSP) to realize voltage sharing. A hardware test platform was built, which is capable of generating current spikes of various magnitudes and durations. Different aspects of system behavior under fault are characterized to provide design guidance to ensure safety. Finally, experimental results show that the proposed series IGBT control can achieve voltage balance without slowing down the switching transients. Additionally, the desaturation circuit can detect an over-current in less than 1 μs. Furthermore, with the proposed protection method, the fault can be fully cleared depending solely on voltage balancing circuits, while maintaining voltage balance during the entire process.
{"title":"Over-current Protection for Series-connected IGBTs based on Desaturation Detection","authors":"Lu Yue, M. Saeed, Inhwan Lee, Xiu Yao","doi":"10.1109/ECCE44975.2020.9235674","DOIUrl":"https://doi.org/10.1109/ECCE44975.2020.9235674","url":null,"abstract":"One major challenge regarding series-connected IGBTs is the protection against over-current faults, besides voltage balancing among the devices. In this paper, an over-current protection method based on desaturation detection is proposed for series-connected IGBTs which are controlled by a digital signal processor (DSP) to realize voltage sharing. A hardware test platform was built, which is capable of generating current spikes of various magnitudes and durations. Different aspects of system behavior under fault are characterized to provide design guidance to ensure safety. Finally, experimental results show that the proposed series IGBT control can achieve voltage balance without slowing down the switching transients. Additionally, the desaturation circuit can detect an over-current in less than 1 μs. Furthermore, with the proposed protection method, the fault can be fully cleared depending solely on voltage balancing circuits, while maintaining voltage balance during the entire process.","PeriodicalId":433712,"journal":{"name":"2020 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133815632","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 : 2020-10-11DOI: 10.1109/ECCE44975.2020.9235403
E. Garza-Arias, J. Rosas-Caro, J. E. Valdez-Resendiz, J. Mayo-Maldonado, G. Escobar-Valderrama, J. Loranca-Coutiño, C. Villarreal-Hernandez, Leonardo J. Valdivia
This paper proposes a new fourth-order dc-dc boost converter, developed as an improved version of the traditional Zeta converter, the main advantages of the proposed quasi-zeta converter are: (i) it can be constructed with a commercial half-bridge transistors package, in contrast with the traditional Zeta converter in which the diode and transistor are not connected to the same node, this characteristic makes easier constructing a high power converter with the proposed configuration, (iii) inductors drain a current smaller than the input current, which reduces the size of inductors, finally, (iii) both input and output current are non-pulsating, which reduces the possibility of having EMI problems. Converter design expressions are formulated with a time-domain analysis. The large signal non-linear model is provided along with a linear small-signal approximation. A comparative evaluation shows the proposed converter requires 55% to the energy stored in inductors to comply with a required input current ripple in comparison with the super-boost converter. Experimental results are provided to verify the principle of the proposed converter.
{"title":"A Novel Boost Converter Topology with Non-Pulsating Input and Output Current","authors":"E. Garza-Arias, J. Rosas-Caro, J. E. Valdez-Resendiz, J. Mayo-Maldonado, G. Escobar-Valderrama, J. Loranca-Coutiño, C. Villarreal-Hernandez, Leonardo J. Valdivia","doi":"10.1109/ECCE44975.2020.9235403","DOIUrl":"https://doi.org/10.1109/ECCE44975.2020.9235403","url":null,"abstract":"This paper proposes a new fourth-order dc-dc boost converter, developed as an improved version of the traditional Zeta converter, the main advantages of the proposed quasi-zeta converter are: (i) it can be constructed with a commercial half-bridge transistors package, in contrast with the traditional Zeta converter in which the diode and transistor are not connected to the same node, this characteristic makes easier constructing a high power converter with the proposed configuration, (iii) inductors drain a current smaller than the input current, which reduces the size of inductors, finally, (iii) both input and output current are non-pulsating, which reduces the possibility of having EMI problems. Converter design expressions are formulated with a time-domain analysis. The large signal non-linear model is provided along with a linear small-signal approximation. A comparative evaluation shows the proposed converter requires 55% to the energy stored in inductors to comply with a required input current ripple in comparison with the super-boost converter. Experimental results are provided to verify the principle of the proposed converter.","PeriodicalId":433712,"journal":{"name":"2020 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133842200","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 : 2020-10-11DOI: 10.1109/ECCE44975.2020.9236358
Hyoung-Kyu Yang, Zeeshan Aleem, Junhyuk Lee, Jung-Wook Park
In this paper, an improved constant power generation (CPG) method is proposed for grid-connected photovoltaic (PV) systems with the fast response under dynamic irradiance condition. Because the penetration level of PV system is rapidly increasing in the power grid, the grid codes have been revised to limit feed-in power, which requires CPG methods. However, conventional CPG methods have the limitation in slow converging speed due to a number of iterations. Therefore, they have large power overshoot and undershoot resulting in the overloading of grid. To figure it out, the proposed CPG method directly estimates the constant power point to converge without voltage steps and decision-making processes. Then, the fast response under dynamic irradiance condition can be achieved with the minimized tracking error. The operating principle of proposed CPG method is firstly explained in detail. Thereafter, its performance is analyzed and compared with that of conventional CPG methods by simulation test.
{"title":"Constant Power Generation Method for Grid-Connected Photovoltaic Systems With Fast Response Under Dynamic Irradiance Condition","authors":"Hyoung-Kyu Yang, Zeeshan Aleem, Junhyuk Lee, Jung-Wook Park","doi":"10.1109/ECCE44975.2020.9236358","DOIUrl":"https://doi.org/10.1109/ECCE44975.2020.9236358","url":null,"abstract":"In this paper, an improved constant power generation (CPG) method is proposed for grid-connected photovoltaic (PV) systems with the fast response under dynamic irradiance condition. Because the penetration level of PV system is rapidly increasing in the power grid, the grid codes have been revised to limit feed-in power, which requires CPG methods. However, conventional CPG methods have the limitation in slow converging speed due to a number of iterations. Therefore, they have large power overshoot and undershoot resulting in the overloading of grid. To figure it out, the proposed CPG method directly estimates the constant power point to converge without voltage steps and decision-making processes. Then, the fast response under dynamic irradiance condition can be achieved with the minimized tracking error. The operating principle of proposed CPG method is firstly explained in detail. Thereafter, its performance is analyzed and compared with that of conventional CPG methods by simulation test.","PeriodicalId":433712,"journal":{"name":"2020 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115341899","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 : 2020-10-11DOI: 10.1109/ECCE44975.2020.9235965
Zhiwei Zhang
This paper proposes a dual three phase rare-earth free spoke-type ferrite permanent magnet traction motor. First, the machine topology and drive system configuration of the proposed design is illustrated. The design specifications and requirements are introduced. Some key design parameters on torque performance are investigated, including the effect of iron bridges, effect of rotor pole shaping, and rotor skewing. The demagnetization risk of the proposed design is also evaluated. Finally, the open-circuit electromagnetic characteristics and on-load torque capability are predicted by finite element analysis. The performance of the proposed design is compared to the rare-earth interior permanent magnet motor and synchronous reluctance motor. The toque density is competitive to that of rare-earth permanent magnet motor with fractional slot concentrated windings. More importantly, the proposed dual three phase spoke-type ferrite traction motor offers several advantages, including low-cost, non-rare-earth magnets, and fault tolerant.
{"title":"Dual Three Phase Rare-Earth Free Spoke-Type Permanent Magnet Synchronous Traction Motor Using Ferrite Magnets","authors":"Zhiwei Zhang","doi":"10.1109/ECCE44975.2020.9235965","DOIUrl":"https://doi.org/10.1109/ECCE44975.2020.9235965","url":null,"abstract":"This paper proposes a dual three phase rare-earth free spoke-type ferrite permanent magnet traction motor. First, the machine topology and drive system configuration of the proposed design is illustrated. The design specifications and requirements are introduced. Some key design parameters on torque performance are investigated, including the effect of iron bridges, effect of rotor pole shaping, and rotor skewing. The demagnetization risk of the proposed design is also evaluated. Finally, the open-circuit electromagnetic characteristics and on-load torque capability are predicted by finite element analysis. The performance of the proposed design is compared to the rare-earth interior permanent magnet motor and synchronous reluctance motor. The toque density is competitive to that of rare-earth permanent magnet motor with fractional slot concentrated windings. More importantly, the proposed dual three phase spoke-type ferrite traction motor offers several advantages, including low-cost, non-rare-earth magnets, and fault tolerant.","PeriodicalId":433712,"journal":{"name":"2020 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115513125","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 : 2020-10-11DOI: 10.1109/ECCE44975.2020.9235734
Deok-Jae Kwon, Jun-Hyuk Im, Mudassir Raza Siddiqi, J. Hur
Imperfect rare-earth magnets due to unavoidable imperfection during slicing/grinding, magnetizing and assembling processes significantly degrade the performance of interior permanent magnet synchronous motor. The robust design strategies during the stable manufacturing process can ensure the reliability of the end products. However, if there is the imperfection of the production quality distribution due to assignable causes, only robust design strategies cannot guarantee complete reliability. Therefore, detection techniques for assignable causes are essential to ensure the reliability of the end products. For this reason, the detection technique is suggested in this paper. The detection technique can be used to detect the indicators of process control in consideration of the imperfections of the rare earth magnets in the manufacturing process has been studied.
{"title":"Detection Technique for Manufacturing Imperefection of Rare-earth Magnets on IPMSM","authors":"Deok-Jae Kwon, Jun-Hyuk Im, Mudassir Raza Siddiqi, J. Hur","doi":"10.1109/ECCE44975.2020.9235734","DOIUrl":"https://doi.org/10.1109/ECCE44975.2020.9235734","url":null,"abstract":"Imperfect rare-earth magnets due to unavoidable imperfection during slicing/grinding, magnetizing and assembling processes significantly degrade the performance of interior permanent magnet synchronous motor. The robust design strategies during the stable manufacturing process can ensure the reliability of the end products. However, if there is the imperfection of the production quality distribution due to assignable causes, only robust design strategies cannot guarantee complete reliability. Therefore, detection techniques for assignable causes are essential to ensure the reliability of the end products. For this reason, the detection technique is suggested in this paper. The detection technique can be used to detect the indicators of process control in consideration of the imperfections of the rare earth magnets in the manufacturing process has been studied.","PeriodicalId":433712,"journal":{"name":"2020 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115552716","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 : 2020-10-11DOI: 10.1109/ECCE44975.2020.9236261
Gaowen Liang, Hossein Dehghan Tafti, G. Farivar, J. Pou, C. Townsend, G. Konstantinou
In operation of the modular multilevel converter (MMC)-based battery energy storage system (BESS), different submodules (SMs) may be required to provide a different amount of active power, which is defined as inter-SM active power disparity in this paper. This happens in various conditions, for example, when some SMs have faulty batteries and thus, cannot process any active power. This paper proposes a general analysis of the inter-SM active power disparity limits of the modular multilevel converter-based battery energy storage systems. An analytical method is provided to derive the maximum/minimum power that any subset of SMs in one arm can provide. Based on the derived results, the active power limits of SMs are nonlinear with the number of SMs. Both simulation and experimental results are provided, which verify the proposed analysis and method. The proposed analysis facilitates the design and operation of the MMC-based BESSs.
{"title":"Analysis of the Inter-Submodule Active Power Disparity Limits of Modular Multilevel Converter-Based Battery Energy Storage Systems","authors":"Gaowen Liang, Hossein Dehghan Tafti, G. Farivar, J. Pou, C. Townsend, G. Konstantinou","doi":"10.1109/ECCE44975.2020.9236261","DOIUrl":"https://doi.org/10.1109/ECCE44975.2020.9236261","url":null,"abstract":"In operation of the modular multilevel converter (MMC)-based battery energy storage system (BESS), different submodules (SMs) may be required to provide a different amount of active power, which is defined as inter-SM active power disparity in this paper. This happens in various conditions, for example, when some SMs have faulty batteries and thus, cannot process any active power. This paper proposes a general analysis of the inter-SM active power disparity limits of the modular multilevel converter-based battery energy storage systems. An analytical method is provided to derive the maximum/minimum power that any subset of SMs in one arm can provide. Based on the derived results, the active power limits of SMs are nonlinear with the number of SMs. Both simulation and experimental results are provided, which verify the proposed analysis and method. The proposed analysis facilitates the design and operation of the MMC-based BESSs.","PeriodicalId":433712,"journal":{"name":"2020 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115603246","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 : 2020-10-11DOI: 10.1109/ECCE44975.2020.9235404
Hao Ding, Leyue Zhang, Ahmed Hembel, B. Sarlioglu
The integrated motor-compressor integrates a flux-switching permanent magnet (FSPM) machine with an axial-flow compressor by shaping the rotor poles of the motor into airfoils. The airfoil-shaped rotor functions as the rotor of a motor as well as the rotor of an axial-flow compressor. The airfoil-shaped rotor poles need to be skewed by the proper blade stagger angle to perform optimal thermodynamic performance with an optimal attack angle. The objective of this paper is to investigate the effects of the stagger angle of the airfoil-shaped rotor on the thermodynamic performance of the integrated motor-compressor with respect to the compression power, compressor stage efficiency, flow turn angle, and total pressure ratio by velocity triangles and mean line calculations. The effects of skew of the stator on the electromagnetic performance of the integrated motor-compressor in terms of winding factor, cogging torque, magnet losses, winding resistance, and iron losses are evaluated by analytical equations and 3-D finite element analysis (FEA).
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