Pub Date : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590074
Csaba-Zoltan Kertesz
This paper presents the results of implementing the Wiring unit for Embedded Wizard, which offers the possibility of using functions familiar from Arduino projects inside a high level GUI building and prototyping environment. The unit allows students for easier microcontroller interfacing of their embedded GUI applications, so they can focus on studying UI and UX design concepts and doing online or offline prototyping of their applications without the need for extensive hardware testing.During the development of the Wiring-like framework also a large-scale study was performed about the usage of the framework in Arduino projects. Almost 200,000 Arduino source code files were analyzed from public GitHub repositories, and the findings about the topmost used functions and libraries are also presented in the paper.
{"title":"Creating a Wiring Framework for Embedded GUI Programming Course","authors":"Csaba-Zoltan Kertesz","doi":"10.1109/OPTIM-ACEMP50812.2021.9590074","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590074","url":null,"abstract":"This paper presents the results of implementing the Wiring unit for Embedded Wizard, which offers the possibility of using functions familiar from Arduino projects inside a high level GUI building and prototyping environment. The unit allows students for easier microcontroller interfacing of their embedded GUI applications, so they can focus on studying UI and UX design concepts and doing online or offline prototyping of their applications without the need for extensive hardware testing.During the development of the Wiring-like framework also a large-scale study was performed about the usage of the framework in Arduino projects. Almost 200,000 Arduino source code files were analyzed from public GitHub repositories, and the findings about the topmost used functions and libraries are also presented in the paper.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79822015","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 : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590043
Lucian Nicolae Tutelea, T. Staudt, I. Boldea
Ever larger torque density, efficiency at moderate costs are key requirements in energy cost critical power drives with applications like home appliances and robotics. In the search for better solutions the multipolar axial-flux PMSM and the multipolar-inner claw-pole stator PMSM evolved as major competitors very recently. In an effort to reduce computation time effort in the optimal design of the inner-claw-pole-stator PMSM for small power applications, to the end of using a single desktop competitive computer, the present paper develops a 3D-MEC (magnetic equivalent circuit model) for the case in point integrated into a dedicated MATLAB code with a unique multi-term objective function, with constraints on efficiency in 3 operation points (torque speed pairs), demagnetization avoidance at 2pu load, and the motor materials cost as the main term; all terms in USD. For a case study the output file provides numerical and graphical comprehensive data that are sufficient to approach the fabrication for four cases: round and slab copper or aluminum wire in ac coils Finally for one optimal design and main operation point key validation with 3D-FEM is offered. The computation time for one wire type with 30 runs from random starting points, on a typical desktop computer was 81.12 seconds, which is an order of magnitudes smaller than existing (arguably more precise) methods.
{"title":"Magnetic equivalent circuit – based optimal design code of high torque density and efficiency small power claw pole stator PM motor","authors":"Lucian Nicolae Tutelea, T. Staudt, I. Boldea","doi":"10.1109/OPTIM-ACEMP50812.2021.9590043","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590043","url":null,"abstract":"Ever larger torque density, efficiency at moderate costs are key requirements in energy cost critical power drives with applications like home appliances and robotics. In the search for better solutions the multipolar axial-flux PMSM and the multipolar-inner claw-pole stator PMSM evolved as major competitors very recently. In an effort to reduce computation time effort in the optimal design of the inner-claw-pole-stator PMSM for small power applications, to the end of using a single desktop competitive computer, the present paper develops a 3D-MEC (magnetic equivalent circuit model) for the case in point integrated into a dedicated MATLAB code with a unique multi-term objective function, with constraints on efficiency in 3 operation points (torque speed pairs), demagnetization avoidance at 2pu load, and the motor materials cost as the main term; all terms in USD. For a case study the output file provides numerical and graphical comprehensive data that are sufficient to approach the fabrication for four cases: round and slab copper or aluminum wire in ac coils Finally for one optimal design and main operation point key validation with 3D-FEM is offered. The computation time for one wire type with 30 runs from random starting points, on a typical desktop computer was 81.12 seconds, which is an order of magnitudes smaller than existing (arguably more precise) methods.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87533869","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 : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590059
R. Nemeş, S. Ciornei, Raluca Raia, M. Ruba, H. Hedesiu, C. Martis, C. Husar, M. Grovu
Designing and optimization of electric vehicles based on powerful computations, requires complex simulation models and modern analysis approaches. Software developers create tools able to perform highly accurate and reliable simulations, however concentrated on types of assemblies of the entire vehicle. Attempting to simulate a full vehicle using a single software, generally leads to many difficulties and non-reliable results. Co-simulations can solve partially this problem with the cost of very long simulation times using powerful computers. The present paper offers a solution to this issue, based on an integration software (National Instruments VeriStand), running online on a real-time target (PXI computer). VeriStand can link into one real-time simulation vehicle assemblies with models created in different software packages. Even more, it is possible to run the interconnected models and at the same time to output/input quantities from real hardware. In this philosophy, the urban electric vehicle model is created in Amesim software, specialized in electrical and mechanical designs. A ultracapacitors supplied urban electrical vehicle is modelled and simulated following this approach. The vehicle is simulated offline in Amesim environment and the output data is used in a real-time simulation to test the Simulink model of the supercapacitors in parallel with the operation of the real hardware.
{"title":"Hardware in the Loop Testing of an Urban Electric Vehicle Model Supplied with Supercapacitors","authors":"R. Nemeş, S. Ciornei, Raluca Raia, M. Ruba, H. Hedesiu, C. Martis, C. Husar, M. Grovu","doi":"10.1109/OPTIM-ACEMP50812.2021.9590059","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590059","url":null,"abstract":"Designing and optimization of electric vehicles based on powerful computations, requires complex simulation models and modern analysis approaches. Software developers create tools able to perform highly accurate and reliable simulations, however concentrated on types of assemblies of the entire vehicle. Attempting to simulate a full vehicle using a single software, generally leads to many difficulties and non-reliable results. Co-simulations can solve partially this problem with the cost of very long simulation times using powerful computers. The present paper offers a solution to this issue, based on an integration software (National Instruments VeriStand), running online on a real-time target (PXI computer). VeriStand can link into one real-time simulation vehicle assemblies with models created in different software packages. Even more, it is possible to run the interconnected models and at the same time to output/input quantities from real hardware. In this philosophy, the urban electric vehicle model is created in Amesim software, specialized in electrical and mechanical designs. A ultracapacitors supplied urban electrical vehicle is modelled and simulated following this approach. The vehicle is simulated offline in Amesim environment and the output data is used in a real-time simulation to test the Simulink model of the supercapacitors in parallel with the operation of the real hardware.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84122681","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 : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590066
Sohel Ahmad, Ulrich Kahnt
For the near-distance railway applications, DC feeding is suitable whose demand is on the rise. In DC traction power supply systems, the overhead lines or the third rails are energized from rectifier stations at certain intervals. The breaking of DC current results in a powerful arc since there is no zero crossing in this case. It makes the task of DC supply more challenging and use of power electronic components feasible [1]. To extinguish the generated arc, rectifier stations are equipped with DC circuit breakers. In mechanical DC circuit breakers, the arc burning between the contacts moves into the arc quenching chamber due to its own thermal action. This process takes time while the fault currents continue to increase. Eventually, there is high wear and tear with a great deal of maintenance work. To get rid of these problems, a hybrid DC circuit breaker, otherwise known as the high-speed switching module (SSM), based on principle of power electronics, is used. This paper deals with the simulation of power circuit of SSM using ANSYS Twin Builder.
{"title":"Simulation of Power Electronics Based High-Speed Switching Module for DC Traction Applications","authors":"Sohel Ahmad, Ulrich Kahnt","doi":"10.1109/OPTIM-ACEMP50812.2021.9590066","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590066","url":null,"abstract":"For the near-distance railway applications, DC feeding is suitable whose demand is on the rise. In DC traction power supply systems, the overhead lines or the third rails are energized from rectifier stations at certain intervals. The breaking of DC current results in a powerful arc since there is no zero crossing in this case. It makes the task of DC supply more challenging and use of power electronic components feasible [1]. To extinguish the generated arc, rectifier stations are equipped with DC circuit breakers. In mechanical DC circuit breakers, the arc burning between the contacts moves into the arc quenching chamber due to its own thermal action. This process takes time while the fault currents continue to increase. Eventually, there is high wear and tear with a great deal of maintenance work. To get rid of these problems, a hybrid DC circuit breaker, otherwise known as the high-speed switching module (SSM), based on principle of power electronics, is used. This paper deals with the simulation of power circuit of SSM using ANSYS Twin Builder.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83939927","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 : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590014
M. Popescu, A. Bitoleanu, C. Suru
This paper is focused on the influence of the DC-circuit in a four-wire shunt active power filter with split capacitor in the case of strongly unbalanced loads. The quantitative aspects that characterize the power quality in the point of common coupling with a nonlinear and unbalanced load are presented for a concrete case study. After determining the nominal power of the shunt active power filter, the control structure of the compensation system based on the indirect current control is presented. The proposed design algorithm is based on a relationship between the DC-voltage ripple, its frequency, the apparent power of active power filter and the average value of the DC-voltage and on simulation results. The validation of the results is achieved both by simulation and experimentally.
{"title":"Theoretical and Experimental Evaluation of DC-Circuit Influence in Four-Wire Active Power Filter with Split Capacitor for Strongly Unbalanced Loads","authors":"M. Popescu, A. Bitoleanu, C. Suru","doi":"10.1109/OPTIM-ACEMP50812.2021.9590014","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590014","url":null,"abstract":"This paper is focused on the influence of the DC-circuit in a four-wire shunt active power filter with split capacitor in the case of strongly unbalanced loads. The quantitative aspects that characterize the power quality in the point of common coupling with a nonlinear and unbalanced load are presented for a concrete case study. After determining the nominal power of the shunt active power filter, the control structure of the compensation system based on the indirect current control is presented. The proposed design algorithm is based on a relationship between the DC-voltage ripple, its frequency, the apparent power of active power filter and the average value of the DC-voltage and on simulation results. The validation of the results is achieved both by simulation and experimentally.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73539678","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 : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590063
L. Barote, C. Marinescu
The state-of-charge (SOC), state-of-health (SOH) estimation and prediction of lithium-ion batteries remaining useful life (RUL) are critical for the safety and reliability of battery management systems (BMS) in electric vehicles (EVs). In this paper, two different methods are used to estimate how much memory is needed to evaluate the SOC and their performances regarding tracking accuracy, memory volume and computational complexity. The SOC and SOH cannot be directly measured and estimation is influenced by many factors, such us battery aging, ambient temperature and the current rate. The complex interrelationship of these factors causes the difficulties in the pursuit of a precise SOC estimation method. The important issue of this study is to obtain the SOC estimation for a specific Li-ion battery based on the behaviour of the battery during operation. The analyzed Li-ion battery is part of a micro-grid (MG) belonging to the Advanced Electrical Systems Research Centre within the Research and Development Institute of Transilvania University of Brasov, which provides around 20 kWh storage capacity. Through simulations, the analyzed SOC estimation method is verified to demonstrate the computational complexity and accuracy.
{"title":"Reserved memory for Li-ion battery SOC estimation method in applications with EV","authors":"L. Barote, C. Marinescu","doi":"10.1109/OPTIM-ACEMP50812.2021.9590063","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590063","url":null,"abstract":"The state-of-charge (SOC), state-of-health (SOH) estimation and prediction of lithium-ion batteries remaining useful life (RUL) are critical for the safety and reliability of battery management systems (BMS) in electric vehicles (EVs). In this paper, two different methods are used to estimate how much memory is needed to evaluate the SOC and their performances regarding tracking accuracy, memory volume and computational complexity. The SOC and SOH cannot be directly measured and estimation is influenced by many factors, such us battery aging, ambient temperature and the current rate. The complex interrelationship of these factors causes the difficulties in the pursuit of a precise SOC estimation method. The important issue of this study is to obtain the SOC estimation for a specific Li-ion battery based on the behaviour of the battery during operation. The analyzed Li-ion battery is part of a micro-grid (MG) belonging to the Advanced Electrical Systems Research Centre within the Research and Development Institute of Transilvania University of Brasov, which provides around 20 kWh storage capacity. Through simulations, the analyzed SOC estimation method is verified to demonstrate the computational complexity and accuracy.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74275712","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 : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590079
A. K., K. Selvajyothi
Traction motor forms an indispensable part of electric vehicle system. Making its right choice will ascertain the range anxiety, maximum speed and battery ratings required for the electric vehicle. The radical increase in the cost of rare earth magnet materials has pressurized all the countries to come up with rare earth magnet free motor as the traction choice. Interior permanent magnet synchronous motor (IPMSM) is the most widely used one although it suffers from the risk of demagnetization at higher temperatures. Due to the aforesaid reasons its popularity is diminishing. This scenario clearly indicates the requirement of feasibility check for Synchronous reluctance motor (SynRM) as the traction choice. This paper provides an in-depth discussion about the performance analysis of SynRM under the following heads: Peak torque capability, continuous thermal envelope, inverter rating and drive cycle analysis. Here the efficiency maps across the entire speed and torque range is studied with Worldwide Harmonized Light Vehicles Test Procedure (WLTP) Class 2 drive cycle. Thereafter these performance indies are compared with an IPMSM of comparable power rating. Another important aspect highlighted here is the tradeoff study between cost, weight and efficiency of the designed motor that will bring in a holistic picture.
{"title":"Performance Comparison of Synchronous Reluctance Motor and Interior Permanent Magnet Synchronous Motor for Traction Application","authors":"A. K., K. Selvajyothi","doi":"10.1109/OPTIM-ACEMP50812.2021.9590079","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590079","url":null,"abstract":"Traction motor forms an indispensable part of electric vehicle system. Making its right choice will ascertain the range anxiety, maximum speed and battery ratings required for the electric vehicle. The radical increase in the cost of rare earth magnet materials has pressurized all the countries to come up with rare earth magnet free motor as the traction choice. Interior permanent magnet synchronous motor (IPMSM) is the most widely used one although it suffers from the risk of demagnetization at higher temperatures. Due to the aforesaid reasons its popularity is diminishing. This scenario clearly indicates the requirement of feasibility check for Synchronous reluctance motor (SynRM) as the traction choice. This paper provides an in-depth discussion about the performance analysis of SynRM under the following heads: Peak torque capability, continuous thermal envelope, inverter rating and drive cycle analysis. Here the efficiency maps across the entire speed and torque range is studied with Worldwide Harmonized Light Vehicles Test Procedure (WLTP) Class 2 drive cycle. Thereafter these performance indies are compared with an IPMSM of comparable power rating. Another important aspect highlighted here is the tradeoff study between cost, weight and efficiency of the designed motor that will bring in a holistic picture.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88843625","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 : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590034
A. Martin, Liviu-Dănuţ Vitan, I. Torac, L. Tutelea, I. Boldea
This paper presents BEGA in generator mode with three three-phase winding and three diode bridge rectifier dc parallel-connected for full power. BEGA is a synchronous machine with a biaxial excitation: one along the d-axis produced by the dc excitation coils (fed through brushes on contactless) and another one along the q-axis produced by the PM. The low-cost ferrite PMs are placed in the flux barriers, in order to destroy the stator-produced q-axis flux linkage. The investigation is rooted in 4 a pole BEGA with 36 slots existing prototype so that FEM investigation is complemented by preliminary measurements related to power level and quality in faulty conditions.It was experimentally demonstrated (with common and insulated null between all three-phase winding sections) the fault-tolerant characteristics in different fault conditions (either interrupted phases or missing diodes). A clear view of the different fault effects on the harmonic spectrum is presented via Fast Fourier Transform (FFT) analysis.
{"title":"BEGA-biaxial excitation generator - operation for constant diode dc output voltage with 3,6,9 phases for increased redundancy","authors":"A. Martin, Liviu-Dănuţ Vitan, I. Torac, L. Tutelea, I. Boldea","doi":"10.1109/OPTIM-ACEMP50812.2021.9590034","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590034","url":null,"abstract":"This paper presents BEGA in generator mode with three three-phase winding and three diode bridge rectifier dc parallel-connected for full power. BEGA is a synchronous machine with a biaxial excitation: one along the d-axis produced by the dc excitation coils (fed through brushes on contactless) and another one along the q-axis produced by the PM. The low-cost ferrite PMs are placed in the flux barriers, in order to destroy the stator-produced q-axis flux linkage. The investigation is rooted in 4 a pole BEGA with 36 slots existing prototype so that FEM investigation is complemented by preliminary measurements related to power level and quality in faulty conditions.It was experimentally demonstrated (with common and insulated null between all three-phase winding sections) the fault-tolerant characteristics in different fault conditions (either interrupted phases or missing diodes). A clear view of the different fault effects on the harmonic spectrum is presented via Fast Fourier Transform (FFT) analysis.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84969206","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 : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590049
L. Tutelea, I. Torac, A. Isfanuti, A. Popa, I. Boldea
In an effort to increase the efficiency close to 0.97 for a power factor above 0.7, at maximum 70 tons (250,000USD) active weight (and cost) for 10 MW, 10rpm wind generator, a Ferrite spoke-PM and bonded NdFeB respectively, multi pole rotor, 3 phase radial air gap synchronous generator was designed here, with key FEM validation checks regarding the flux density distribution and torque waveform and Ldm, Lqm inductances for pure Iq field-oriented control (FOC). The rotor was provided with flux barriers in axis q, to further reduce q axis inductance and thus increase power factor. Two variants of rotor core geometry have been considered: one with a single lamination (without and with additional radial magnets) and one with detachable poles with flux barriers; in all, 6 rotor variants. It has been also proved that the generator can survive approx. 2.00 p.u. load without serious PM demagnetization.
{"title":"10MW, 10rpm, 30Hz spoke Ferrite and bonded NdFeB-rotor wind PMSG preliminary design with FEM validations for 6 rotor variants","authors":"L. Tutelea, I. Torac, A. Isfanuti, A. Popa, I. Boldea","doi":"10.1109/OPTIM-ACEMP50812.2021.9590049","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590049","url":null,"abstract":"In an effort to increase the efficiency close to 0.97 for a power factor above 0.7, at maximum 70 tons (250,000USD) active weight (and cost) for 10 MW, 10rpm wind generator, a Ferrite spoke-PM and bonded NdFeB respectively, multi pole rotor, 3 phase radial air gap synchronous generator was designed here, with key FEM validation checks regarding the flux density distribution and torque waveform and Ldm, Lqm inductances for pure Iq field-oriented control (FOC). The rotor was provided with flux barriers in axis q, to further reduce q axis inductance and thus increase power factor. Two variants of rotor core geometry have been considered: one with a single lamination (without and with additional radial magnets) and one with detachable poles with flux barriers; in all, 6 rotor variants. It has been also proved that the generator can survive approx. 2.00 p.u. load without serious PM demagnetization.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88095903","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 : 2021-09-02DOI: 10.1109/OPTIM-ACEMP50812.2021.9590036
Liangwei Huang, Chao Wu, Dao Zhou, F. Blaabjerg
Conventional vector current control (VCC) based grid-following inverters suffer from stability issues under weak grid, which attracts a lot of attention in recent years. Small-signal linearized model is an effective tool to analyze the stability of such nonlinear systems. In this paper, three small-signal stability analysis methods are compared, which are the state-space method, impedance analysis method, and equivalent single-input single-output (SISO) stability analysis method. These three methods are based on the same primitive system but with different input-output relations. Through strict analysis, it is found that the three methods basically predict the same stability boundary. Finally, the advantages and disadvantages of three methods are summarized and compared.
{"title":"Comparison of Three Small-Signal Stability Analysis Methods for Grid-Following Inverter","authors":"Liangwei Huang, Chao Wu, Dao Zhou, F. Blaabjerg","doi":"10.1109/OPTIM-ACEMP50812.2021.9590036","DOIUrl":"https://doi.org/10.1109/OPTIM-ACEMP50812.2021.9590036","url":null,"abstract":"Conventional vector current control (VCC) based grid-following inverters suffer from stability issues under weak grid, which attracts a lot of attention in recent years. Small-signal linearized model is an effective tool to analyze the stability of such nonlinear systems. In this paper, three small-signal stability analysis methods are compared, which are the state-space method, impedance analysis method, and equivalent single-input single-output (SISO) stability analysis method. These three methods are based on the same primitive system but with different input-output relations. Through strict analysis, it is found that the three methods basically predict the same stability boundary. Finally, the advantages and disadvantages of three methods are summarized and compared.","PeriodicalId":32117,"journal":{"name":"Bioma","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76506317","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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