Pub Date : 2024-12-31DOI: 10.30941/CESTEMS.2024.00044
Mahmoud-Reza Kheiri;Arash Kiyoumarsi;Hasan Zamani
In this manuscript, a new axial-flux permanent-magnet machine (AFPMM) is designed, analyzed, improved, and successfully tested. A double-sided AFPM generator with four layers of stator winding is initially designed using a well-known quasi-3D analytical method. Then, the designed machine is simulated using commercial software. It is shown that modification techniques are required to improve the performance of both the torque ripple and the ratio of the third to the fundamental harmonics of the induced voltage. Therefore, a new improvement technique is proposed, in which the layers of the stator winding are shifted relative to each other. While this new technique significantly improves the third harmonic problem, the design still has a high torque ripple and, thus, it is suggested to combine the proposed method with the conventional magnet shifting technique. It is revealed numerically that the resulting combination properly resolves both third harmonic and torque ripple problems. Therefore, this design is considered the main design of the present manuscript. In the end, a prototype of the main design is manufactured and tested. It is shown that the measurement results are in good agreement with those of numerical software.
{"title":"Design, Analysis, and Torque and Induced Phase Voltage Improvement of an Axial-Flux Permanent-Magnet Synchronous Machine","authors":"Mahmoud-Reza Kheiri;Arash Kiyoumarsi;Hasan Zamani","doi":"10.30941/CESTEMS.2024.00044","DOIUrl":"https://doi.org/10.30941/CESTEMS.2024.00044","url":null,"abstract":"In this manuscript, a new axial-flux permanent-magnet machine (AFPMM) is designed, analyzed, improved, and successfully tested. A double-sided AFPM generator with four layers of stator winding is initially designed using a well-known quasi-3D analytical method. Then, the designed machine is simulated using commercial software. It is shown that modification techniques are required to improve the performance of both the torque ripple and the ratio of the third to the fundamental harmonics of the induced voltage. Therefore, a new improvement technique is proposed, in which the layers of the stator winding are shifted relative to each other. While this new technique significantly improves the third harmonic problem, the design still has a high torque ripple and, thus, it is suggested to combine the proposed method with the conventional magnet shifting technique. It is revealed numerically that the resulting combination properly resolves both third harmonic and torque ripple problems. Therefore, this design is considered the main design of the present manuscript. In the end, a prototype of the main design is manufactured and tested. It is shown that the measurement results are in good agreement with those of numerical software.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"8 4","pages":"404-413"},"PeriodicalIF":0.0,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10818788","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.30941/CESTEMS.2024.00046
Huawei Zhou;Xiaolong Xiang;Yibo Li;Tao Tao
Finite-control-set model predictive control (FCS-MPC) has advantages of multi-objective optimization and easy implementation. To reduce the computational burden and switching frequency, this article proposed a simplified MPC for dual three-phase permanent magnet synchronous motor (DTP-PMSM). The novelty of this method is the decomposition of prediction function and the switching optimization algorithm. Based on the decomposition of prediction function, the current increment vector is obtained, which is employed to select the optimal voltage vector and calculate the duty cycle. Then, the computation burden can be reduced and the current tracking performance can be maintained. Additionally, the switching optimization algorithm was proposed to optimize the voltage vector action sequence, which results in lower switching frequency. Hence, this control strategy can not only reduce the computation burden and switching frequency, but also maintain the steady-state and dynamic performance. The simulation and experimental results are presented to verify the feasibility of the proposed strategy.
{"title":"Simplified Model Predictive Current Control for Dual Three-Phase PMSM with Low Computation Burden and Switching Frequency","authors":"Huawei Zhou;Xiaolong Xiang;Yibo Li;Tao Tao","doi":"10.30941/CESTEMS.2024.00046","DOIUrl":"https://doi.org/10.30941/CESTEMS.2024.00046","url":null,"abstract":"Finite-control-set model predictive control (FCS-MPC) has advantages of multi-objective optimization and easy implementation. To reduce the computational burden and switching frequency, this article proposed a simplified MPC for dual three-phase permanent magnet synchronous motor (DTP-PMSM). The novelty of this method is the decomposition of prediction function and the switching optimization algorithm. Based on the decomposition of prediction function, the current increment vector is obtained, which is employed to select the optimal voltage vector and calculate the duty cycle. Then, the computation burden can be reduced and the current tracking performance can be maintained. Additionally, the switching optimization algorithm was proposed to optimize the voltage vector action sequence, which results in lower switching frequency. Hence, this control strategy can not only reduce the computation burden and switching frequency, but also maintain the steady-state and dynamic performance. The simulation and experimental results are presented to verify the feasibility of the proposed strategy.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"8 4","pages":"447-454"},"PeriodicalIF":0.0,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10818790","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.30941/CESTEMS.2024.00047
Yuting Lu;Beichen Ding;Kaide Huang;Guodong Feng
For permanent magnet synchronous machines (PMSMs), accurate machine model is critical for high performance maximum torque per ampere (MTPA) control. However, as motor speed increases, the nonlinearity such as core loss effect will affect the accuracy of machine model and thus the performance of online MTPA control. This paper firstly investigates the performance of the model based MTPA control under different motor speeds through modeling, simulation and experiments, which indicates that the accuracy of MTPA control is greatly reduced especially under high-speeds due to machine nonlinearity. Hence, this paper proposes an efficient nonlinearity compensation model based on polynomial fitting to model and compensate the MTPA error as motor speed increases. Considering both core loss and magnetic saturation effects, the compensation model is a nonlinear polynomial of speed and stator current. To obtain the fitting data, a derivative modeling method is proposed to compute the actual and detected MTPA angles under different speeds, in which the derivative model of torque to current ratio is fitted and the MTPA angle is obtained by setting the derivative model to zero. The proposed compensation model is both computation effective and easy to use for MTPA control, as it computes the compensation term that can be directly combined to other model-based methods. The proposed model is evaluated with experiments and comparisons on a test motor to show the performance improvement.
{"title":"Core Loss Effect Modeling and Compensation for Improved MTPA Control of PMSM Drive under High-Speed Conditions","authors":"Yuting Lu;Beichen Ding;Kaide Huang;Guodong Feng","doi":"10.30941/CESTEMS.2024.00047","DOIUrl":"https://doi.org/10.30941/CESTEMS.2024.00047","url":null,"abstract":"For permanent magnet synchronous machines (PMSMs), accurate machine model is critical for high performance maximum torque per ampere (MTPA) control. However, as motor speed increases, the nonlinearity such as core loss effect will affect the accuracy of machine model and thus the performance of online MTPA control. This paper firstly investigates the performance of the model based MTPA control under different motor speeds through modeling, simulation and experiments, which indicates that the accuracy of MTPA control is greatly reduced especially under high-speeds due to machine nonlinearity. Hence, this paper proposes an efficient nonlinearity compensation model based on polynomial fitting to model and compensate the MTPA error as motor speed increases. Considering both core loss and magnetic saturation effects, the compensation model is a nonlinear polynomial of speed and stator current. To obtain the fitting data, a derivative modeling method is proposed to compute the actual and detected MTPA angles under different speeds, in which the derivative model of torque to current ratio is fitted and the MTPA angle is obtained by setting the derivative model to zero. The proposed compensation model is both computation effective and easy to use for MTPA control, as it computes the compensation term that can be directly combined to other model-based methods. The proposed model is evaluated with experiments and comparisons on a test motor to show the performance improvement.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"8 4","pages":"436-446"},"PeriodicalIF":0.0,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10818786","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.30941/CESTEMS.2024.00049
Xiaoguang Zhang;Ruifang Chen
To address the performance degradation of permanent magnet synchronous motor (PMSM) drives caused by parameter mismatches between actual motor and ideal model in complex industrial environment, an improved model predictive voltage control (I-MPVC) approach without motor parameters is presented in this article. Unlike traditional MPVC where accurate motor parameters are heavily relied on, a motor parameter-independent (MPI) prediction model is constructed to eliminate parameter dependency. Firstly, an incremental voltage prediction model is developed where the influence of resistance and flux linkage mismatches is reduced. Then, an inductance parameter-independent (IPI) factor model, which solely relies on the current and voltage information, is further designed. Besides, the proposed approach takes lower computational complexity, as well as simpler parameter tuning steps, which offers significant benefits for real-time applications in industrial fields. Finally, experiments are conducted to validate the feasibility and superiority of the proposed approach.
{"title":"An Improved Model Predictive Voltage Control for PMSM Drives without Motor Parameters","authors":"Xiaoguang Zhang;Ruifang Chen","doi":"10.30941/CESTEMS.2024.00049","DOIUrl":"https://doi.org/10.30941/CESTEMS.2024.00049","url":null,"abstract":"To address the performance degradation of permanent magnet synchronous motor (PMSM) drives caused by parameter mismatches between actual motor and ideal model in complex industrial environment, an improved model predictive voltage control (I-MPVC) approach without motor parameters is presented in this article. Unlike traditional MPVC where accurate motor parameters are heavily relied on, a motor parameter-independent (MPI) prediction model is constructed to eliminate parameter dependency. Firstly, an incremental voltage prediction model is developed where the influence of resistance and flux linkage mismatches is reduced. Then, an inductance parameter-independent (IPI) factor model, which solely relies on the current and voltage information, is further designed. Besides, the proposed approach takes lower computational complexity, as well as simpler parameter tuning steps, which offers significant benefits for real-time applications in industrial fields. Finally, experiments are conducted to validate the feasibility and superiority of the proposed approach.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"8 4","pages":"471-480"},"PeriodicalIF":0.0,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10818789","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-27DOI: 10.30941/CESTEMS.2024.00037
Mehrage Ghods;Jawad Faiz;Hamed Gorginpour
Nowadays, there is considerable research interest in proposing modern permanent magnet (PM) electric machine structures for applications such as electric vehicles. Several radial and axial topologies with different arrangements of PM in the stator and rotor have been introduced for PM Vernier motors (PMVM) with the aim of increasing the performance characteristics such as power factor, efficiency, rotational torque, torque density and wider constant torque-speed region. Meanwhile, the spoke PM arrangement has provided higher torque density than the surface and V-shaped arrangement. But in contrast, the V-shaped arrangement has a more sinusoidal flux and less cogging torque. In this paper, a 620 W, 12-slot 16-pole Vernier PM motor with a fractional slot arrangement. Consequent K-shaped pole is introduced, which has the advantages of spoke and V-shaped magnetic arrangements. After presenting and confirming the concept of the proposed structure based on functional comparison with conventional structures, an analytical modeling based on the harmonic analysis method is introduced to accurately predict the performance of the machine, and finally the proposed structure is prototyped and the experimental results are simulated and modeling are compared.
{"title":"Design and Evaluation of a Consequent Pole K-Shaped Permanent Magnet Motor for Outboard Application using a Hybrid Mathematical Model","authors":"Mehrage Ghods;Jawad Faiz;Hamed Gorginpour","doi":"10.30941/CESTEMS.2024.00037","DOIUrl":"https://doi.org/10.30941/CESTEMS.2024.00037","url":null,"abstract":"Nowadays, there is considerable research interest in proposing modern permanent magnet (PM) electric machine structures for applications such as electric vehicles. Several radial and axial topologies with different arrangements of PM in the stator and rotor have been introduced for PM Vernier motors (PMVM) with the aim of increasing the performance characteristics such as power factor, efficiency, rotational torque, torque density and wider constant torque-speed region. Meanwhile, the spoke PM arrangement has provided higher torque density than the surface and V-shaped arrangement. But in contrast, the V-shaped arrangement has a more sinusoidal flux and less cogging torque. In this paper, a 620 W, 12-slot 16-pole Vernier PM motor with a fractional slot arrangement. Consequent K-shaped pole is introduced, which has the advantages of spoke and V-shaped magnetic arrangements. After presenting and confirming the concept of the proposed structure based on functional comparison with conventional structures, an analytical modeling based on the harmonic analysis method is introduced to accurately predict the performance of the machine, and finally the proposed structure is prototyped and the experimental results are simulated and modeling are compared.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"8 4","pages":"379-393"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10770092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, a magnetic field modulation model considering the influence of phase angles is established for the analysis and weakening of the cogging torque of the permanent magnet synchronous wind generations. Compared with the existing analytical model, the modulation effect of the magnetic field harmonics and phase angle on the cogging torque components is analyzed in the new model. Firstly, flux density model with phase angle characteristics is derived, and the relationship of the cogging torque and magnetic field harmonic is analyzed using energy method. Then, based on the magnetic modulation mechanism, the impact of the phase angle and magnetic field harmonics on the coupling relationship among cogging torque components is analyzed. All cogging torque components are classified as a combination of multiple positive and negative harmonic components, and the contribution characteristics of the components are determined by the harmonic combination and phase angle characteristics. Based on the finite element model (FEM), the magnetic field modulation model of the cogging torque is proved. On the basis of the conclusions obtained, it is further explained that the suppression mechanism of rotor-step skewing is a mutual complementary effect of the positive components and negative cogging components, and the main harmonic is effectively offset by selecting the seasonable of segment number and skewed angle of rotor. Finally, in order to verify the validity of the analysis method, the no-load line back EMF and cogging torque of optimized prototype is tested, and the experimental results agree well with the FEM results.
{"title":"Analysis and Reduction of Cogging Torque of Permanent Magnet Synchronous Wind Generators Based on the Magnetic Field Modulation Mechanism","authors":"Zexing Li;Chao Liu;Yiwen Fan;Zixuan Zhang;Jiakuan Xia","doi":"10.30941/CESTEMS.2024.00040","DOIUrl":"https://doi.org/10.30941/CESTEMS.2024.00040","url":null,"abstract":"In this paper, a magnetic field modulation model considering the influence of phase angles is established for the analysis and weakening of the cogging torque of the permanent magnet synchronous wind generations. Compared with the existing analytical model, the modulation effect of the magnetic field harmonics and phase angle on the cogging torque components is analyzed in the new model. Firstly, flux density model with phase angle characteristics is derived, and the relationship of the cogging torque and magnetic field harmonic is analyzed using energy method. Then, based on the magnetic modulation mechanism, the impact of the phase angle and magnetic field harmonics on the coupling relationship among cogging torque components is analyzed. All cogging torque components are classified as a combination of multiple positive and negative harmonic components, and the contribution characteristics of the components are determined by the harmonic combination and phase angle characteristics. Based on the finite element model (FEM), the magnetic field modulation model of the cogging torque is proved. On the basis of the conclusions obtained, it is further explained that the suppression mechanism of rotor-step skewing is a mutual complementary effect of the positive components and negative cogging components, and the main harmonic is effectively offset by selecting the seasonable of segment number and skewed angle of rotor. Finally, in order to verify the validity of the analysis method, the no-load line back EMF and cogging torque of optimized prototype is tested, and the experimental results agree well with the FEM results.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"8 4","pages":"463-470"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10770096","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-27DOI: 10.30941/CESTEMS.2024.00038
Ye Zhang;Zixin Li;Fanqiang Gao;Jinhao Zhang;Cong Zhao;Yaohua Li
In the cascaded H-bridge inverter (CHBI) with supercapacitor and dc-dc stage, inherent second-order harmonic power flows through each submodule (SM), causing fluctuations in both the dc-link voltage and the dc-dc current. There exist limitations in handling these fluctuations at variable output frequencies when employing proportional-integral (PI) control to the dc-dc stage. This paper aims to coordinately control these second-order harmonic voltage and current fluctuations in the CHBI. The presented method configures a specific second-order harmonic voltage reference, equipped with a maximum voltage fluctuation constraint and a suitable phase, for the dc-dc stage. A PI-resonant controller is used to track the configured reference. This allows for regulating the second-order harmonic fluctuation in the average dc-link voltage among the SMs within a certain value. Importantly, the second-order harmonic fluctuation in the dc-dc current can also be reduced. Simulation and experimental results demonstrate the effectiveness of the presented method.
{"title":"Coordinated Control of Second-Order Harmonic Voltage and Current Fluctuations in Cascaded H-Bridge Inverter with Supercapacitor and DC-DC Stage at Variable Output Frequencies","authors":"Ye Zhang;Zixin Li;Fanqiang Gao;Jinhao Zhang;Cong Zhao;Yaohua Li","doi":"10.30941/CESTEMS.2024.00038","DOIUrl":"https://doi.org/10.30941/CESTEMS.2024.00038","url":null,"abstract":"In the cascaded H-bridge inverter (CHBI) with supercapacitor and dc-dc stage, inherent second-order harmonic power flows through each submodule (SM), causing fluctuations in both the dc-link voltage and the dc-dc current. There exist limitations in handling these fluctuations at variable output frequencies when employing proportional-integral (PI) control to the dc-dc stage. This paper aims to coordinately control these second-order harmonic voltage and current fluctuations in the CHBI. The presented method configures a specific second-order harmonic voltage reference, equipped with a maximum voltage fluctuation constraint and a suitable phase, for the dc-dc stage. A PI-resonant controller is used to track the configured reference. This allows for regulating the second-order harmonic fluctuation in the average dc-link voltage among the SMs within a certain value. Importantly, the second-order harmonic fluctuation in the dc-dc current can also be reduced. Simulation and experimental results demonstrate the effectiveness of the presented method.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"8 4","pages":"481-492"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10770095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid state circuit breakers (SSCBs) based on full-controlled devices such as IGBT and based on half-controlled devices such as thyristor have their respective advantages. The mixture device solid state circuit breaker (M-SSCB) combines the advantages together and can achieve lower loss, high efficiency, active and reliable blocking at the same time. However, the conduction loss will increase significantly when the topology expanding to a bidirectional topology because the bidirectional line commutation switch (LCS) structure composed of two groups of IGBTs in reverse series. In this paper, a novel discrete branch mixture SSCB (DBM-SSCB) is proposed, bidirectional current only flows through one IGBT that has the obvious conduction losses advantage at the same voltage and current level. Only one energy-absorbing component is shared by two discrete branches can guarantee optimal costs and volume. By calculation, the proposed DBM-SSCB can reduce the conduction loss about 30.4% in 10 kV MVDC system, while retaining other advantages of the mixture device SSCB, such as without introducing additional thyristors, charging power supply and the ability to actively interrupt bidirectional fault currents. The blocking principles and designing guidelines are presented in detail, the feasibility is verified by 500 V-18 A simulation results and scale-down experiment, the engineering calculation and simulation of 10 kV-1 kA prototype is completed and compared with other DCCBs. Experimental results and comparative analysis show that the proposed DBM-SSCB has both lower losses and significant performance advantages thus has a good engineering application prospect.
基于IGBT等全控器件的固态断路器和基于晶闸管等半控器件的固态断路器各有优点。混合装置固态断路器（M-SSCB）将这些优点结合在一起，可以同时实现低损耗、高效率、主动可靠的封锁。然而，由于双向线路换流开关（LCS）结构是由两组反向串联的igbt组成的，当拓扑扩展到双向拓扑时，导通损耗会显著增加。本文提出了一种新型的离散支路混合SSCB (DBM-SSCB)，双向电流只流过一个IGBT，在相同电压和电流水平下具有明显的导通损耗优势。只有一个吸能组件由两个离散的分支共享，才能保证最优的成本和体积。经计算，DBM-SSCB在10 kV MVDC系统中可降低约30.4%的导通损耗，同时保留了混合装置SSCB的其他优点，如不引入额外的晶闸管、充电电源和主动中断双向故障电流的能力。详细介绍了阻塞原理和设计准则，通过500 v - 18a仿真结果和缩小实验验证了其可行性，完成了10 kV-1 kA样机的工程计算和仿真，并与其他dccb进行了比较。实验结果和对比分析表明，所提出的DBM-SSCB具有较低的损耗和显著的性能优势，具有良好的工程应用前景。
{"title":"A Novel Discrete Branch Bidirectional Solid-State Circuit Breaker Based on Mixture Device","authors":"Qingpeng Zeng;Jin Zhu;Songming He;Daoqi Wang;Tongzhen Wei","doi":"10.30941/CESTEMS.2024.00042","DOIUrl":"https://doi.org/10.30941/CESTEMS.2024.00042","url":null,"abstract":"Solid state circuit breakers (SSCBs) based on full-controlled devices such as IGBT and based on half-controlled devices such as thyristor have their respective advantages. The mixture device solid state circuit breaker (M-SSCB) combines the advantages together and can achieve lower loss, high efficiency, active and reliable blocking at the same time. However, the conduction loss will increase significantly when the topology expanding to a bidirectional topology because the bidirectional line commutation switch (LCS) structure composed of two groups of IGBTs in reverse series. In this paper, a novel discrete branch mixture SSCB (DBM-SSCB) is proposed, bidirectional current only flows through one IGBT that has the obvious conduction losses advantage at the same voltage and current level. Only one energy-absorbing component is shared by two discrete branches can guarantee optimal costs and volume. By calculation, the proposed DBM-SSCB can reduce the conduction loss about 30.4% in 10 kV MVDC system, while retaining other advantages of the mixture device SSCB, such as without introducing additional thyristors, charging power supply and the ability to actively interrupt bidirectional fault currents. The blocking principles and designing guidelines are presented in detail, the feasibility is verified by 500 V-18 A simulation results and scale-down experiment, the engineering calculation and simulation of 10 kV-1 kA prototype is completed and compared with other DCCBs. Experimental results and comparative analysis show that the proposed DBM-SSCB has both lower losses and significant performance advantages thus has a good engineering application prospect.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"8 4","pages":"493-503"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10770091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For permanent magnet synchronous machine (PMSM), the machine model is critical to predict the operating states for motor control, which, however, can be greatly affected by system nonlinearities. Hence, this paper investigates accurate machine modeling for control and parameter estimation. In the proposed approach, the PMSM model with saturated inductances is used as the base model, and this paper investigates modeling and compensation of the offsets to the base model due to system nonlinearities such as saturation and core loss effects for accurate machine modeling and voltage prediction. Specifically, the offsets to the base model are modeled using nonlinear functions with variable coefficients to compensate saturation and core loss effect, which can achieve better accuracy without changing the model structure. A differential estimation model is derived to estimate the model coefficients from a small amount of measurements with simplified procedure. Moreover, the model offset calculation is both computation and memory efficient with simplified implementation. The contribution is to improve the machine model accuracy and achieve precise voltage prediction for practical applications. Experiments, comparisons and the application to temperature estimation are conducted on a test interior PMSM to validate the proposed approach.
{"title":"Nonlinearity Estimation and Compensation for Accurate PMSM Modeling and Voltage Prediction","authors":"Beichen Ding;Yuting Lu;Chunyan Lai;Weiwen Peng;Kaide Huang;Guodong Feng","doi":"10.30941/CESTEMS.2024.00034","DOIUrl":"https://doi.org/10.30941/CESTEMS.2024.00034","url":null,"abstract":"For permanent magnet synchronous machine (PMSM), the machine model is critical to predict the operating states for motor control, which, however, can be greatly affected by system nonlinearities. Hence, this paper investigates accurate machine modeling for control and parameter estimation. In the proposed approach, the PMSM model with saturated inductances is used as the base model, and this paper investigates modeling and compensation of the offsets to the base model due to system nonlinearities such as saturation and core loss effects for accurate machine modeling and voltage prediction. Specifically, the offsets to the base model are modeled using nonlinear functions with variable coefficients to compensate saturation and core loss effect, which can achieve better accuracy without changing the model structure. A differential estimation model is derived to estimate the model coefficients from a small amount of measurements with simplified procedure. Moreover, the model offset calculation is both computation and memory efficient with simplified implementation. The contribution is to improve the machine model accuracy and achieve precise voltage prediction for practical applications. Experiments, comparisons and the application to temperature estimation are conducted on a test interior PMSM to validate the proposed approach.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"8 4","pages":"394-403"},"PeriodicalIF":0.0,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10705034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-03DOI: 10.30941/CESTEMS.2024.00035
Jinyang Han;Hepeng Su;Weichao Li;Hao Yuan
Vector-controlled AC motor drives utilize pulse width modulation (PWM) to synthesize the desired output voltage of the voltage source inverter (VSI). In space vector PWM (SVPWM) techniques, the average realization of the space vector applying the volt-sec balance principle results in an instantaneous error voltage that generates high frequency torque ripple. It may lead to an increase in motor vibration and acoustic noise. This article presents a high frequency torque ripple prediction model based on stator flux ripple and proposes a targeted designed variable switching frequency PWM (VSFPWM) strategy to diminish high frequency torque ripple. The switching frequency is dynamically adjusted according to the peak value of the predicted stator flux ripple to mitigate high frequency torque ripple. In contrast to existing strategies, the strategy outlined in this article directly suppresses high frequency torque ripple, thus remaining unaffected by inaccurate motor parameters. Additionally, due to the introduction of the power factor angle, the proposed strategy can better adapt to the full speed range operating conditions of the motor. Detailed simulations and experiments are provided to validate the effectiveness of the proposed strategy.
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