Pub Date : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709486
Arvind H Kadam, S. Williamson
Nowadays, the LCL (inductor-capacitor-inductor) filter is an integral part of every power electronic converter system operating on current control. Though higher order, the LCL filter due to its high harmonic suppression capability are widely adopted in back-to-back converter systems or grid connected converter systems. Normally, with LCL filter, the control system follows double closed loop with outer loop controlling DC voltage and inner loop controlling AC current. However, for some special applications like common DC-bus-configured motor emulator (ME) system, the DC bus voltage is not required to be controlled. In addition, the presence of LCL filter introduces cross coupling of flux and torque component in case of AC motor emulation. The double closed loop control is generally adopted to decouple torque and flux components, however the controller design is more complex process. Therefore, this paper presents a single loop control of a common DC-bus-configured ME system with LCL filter based on state feedback linearization method. The decoupling equations in direct and quadrature axis are derived here. The simulation results presented for a 2.0 kW PMSM motor validate the stability as well as closed loop operation of the system with single loop control.
{"title":"Single Loop Control of a Common DC-Bus-Configured Traction Motor Emulator Using State Feedback Linearization Method","authors":"Arvind H Kadam, S. Williamson","doi":"10.1109/SPEC52827.2021.9709486","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709486","url":null,"abstract":"Nowadays, the LCL (inductor-capacitor-inductor) filter is an integral part of every power electronic converter system operating on current control. Though higher order, the LCL filter due to its high harmonic suppression capability are widely adopted in back-to-back converter systems or grid connected converter systems. Normally, with LCL filter, the control system follows double closed loop with outer loop controlling DC voltage and inner loop controlling AC current. However, for some special applications like common DC-bus-configured motor emulator (ME) system, the DC bus voltage is not required to be controlled. In addition, the presence of LCL filter introduces cross coupling of flux and torque component in case of AC motor emulation. The double closed loop control is generally adopted to decouple torque and flux components, however the controller design is more complex process. Therefore, this paper presents a single loop control of a common DC-bus-configured ME system with LCL filter based on state feedback linearization method. The decoupling equations in direct and quadrature axis are derived here. The simulation results presented for a 2.0 kW PMSM motor validate the stability as well as closed loop operation of the system with single loop control.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115236121","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709469
Karamat Adavi, Christian Kessler, R. Ruf
This article presents a non-isolated 650W DC-DC converter with an input voltage range of 150V until 700V. A novel buck-boost topology with two low-side MOSFETs was designed by combining the classical buck topology and boost topology. This novel topology configuration has an advantage in selecting gate driver integrated circuit (IC), since the IC does not need to provide high-side gate signals. To control gate signals of the two low-side MOSFETs, a new analog control circuitry was proposed and implemented. A 290V output voltage and 650W output power prototype were fabricated to evaluate the effectiveness of the proposed converter. The measurements are validated a peak efficiency of 98.11% in boost mode and 97.45% in buck mode at a switching frequency of 100kHz.
{"title":"A non-isolated 650W DC-DC converter using a novel buck-boost topology with two low-side MOSFETs","authors":"Karamat Adavi, Christian Kessler, R. Ruf","doi":"10.1109/SPEC52827.2021.9709469","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709469","url":null,"abstract":"This article presents a non-isolated 650W DC-DC converter with an input voltage range of 150V until 700V. A novel buck-boost topology with two low-side MOSFETs was designed by combining the classical buck topology and boost topology. This novel topology configuration has an advantage in selecting gate driver integrated circuit (IC), since the IC does not need to provide high-side gate signals. To control gate signals of the two low-side MOSFETs, a new analog control circuitry was proposed and implemented. A 290V output voltage and 650W output power prototype were fabricated to evaluate the effectiveness of the proposed converter. The measurements are validated a peak efficiency of 98.11% in boost mode and 97.45% in buck mode at a switching frequency of 100kHz.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123485900","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}
Small signal analysis methods in frequency domain and time domain have been frequently proposed to identify stability issue of grid-connected inverter. However, it fails to deal with nonlinear characteristics caused by variation of different operating points. This paper presents a nonlinear stability analysis method to investigate the effects of nonlinear components on stability of grid-connected inverter, where the nonlinearity of inductor is addressed as an example to investigate the nonlinear stability mechanism. The model of nonlinear inductor is first established by describing function method. Then, the transfer function with nonlinear plant and linear plant is established by loop transformation method. Moreover, the nonlinear stability criterion is developed by identifying the relationship of describing function of nonlinear plant and Nyquist diagram of linear plant. Simulation and experimental results validate the effectiveness of the proposed nonlinear stability analysis method, which can provide the guideline to optimize inverter parameters at design stage so as to avoid the potential instability issues caused by nonlinear components.
{"title":"A Nonlinear Stability Analysis Method of Grid-Connected Inverter","authors":"Yanbo Wang, Dong Liu, Zhan Shen, Qi Zhang, F. Deng, Zhe Chen","doi":"10.1109/SPEC52827.2021.9709445","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709445","url":null,"abstract":"Small signal analysis methods in frequency domain and time domain have been frequently proposed to identify stability issue of grid-connected inverter. However, it fails to deal with nonlinear characteristics caused by variation of different operating points. This paper presents a nonlinear stability analysis method to investigate the effects of nonlinear components on stability of grid-connected inverter, where the nonlinearity of inductor is addressed as an example to investigate the nonlinear stability mechanism. The model of nonlinear inductor is first established by describing function method. Then, the transfer function with nonlinear plant and linear plant is established by loop transformation method. Moreover, the nonlinear stability criterion is developed by identifying the relationship of describing function of nonlinear plant and Nyquist diagram of linear plant. Simulation and experimental results validate the effectiveness of the proposed nonlinear stability analysis method, which can provide the guideline to optimize inverter parameters at design stage so as to avoid the potential instability issues caused by nonlinear components.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130556232","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709470
Xiaorui Wu, Jing Xiao, Shuai Han, Wenlan Gong, Ning Wu
Inductive power transfer is one of the most effective ways to provide flexible power for mobile devices. Whereas, in practical application, because of the skin-effect loss and proximity-effect loss, when the inductive power transfer system works at high frequency (MHz), the resistance of coil would increase rapidly. The increase of coil resistance leads to the decrease of power amount and transmission efficiency. Therefore, a spatial spiral layout was proposed, which can significantly reduce the skin-effect and proximity-effect loss at high operation frequency. The special coil structure can significantly decrease the resistance of coil and improve the power amount and transmission efficiency of inductive power transfer system at high frequency operation.
{"title":"Improvement in Efficiency of Inductive Power Transfer Using Spatial Spiral Layout","authors":"Xiaorui Wu, Jing Xiao, Shuai Han, Wenlan Gong, Ning Wu","doi":"10.1109/SPEC52827.2021.9709470","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709470","url":null,"abstract":"Inductive power transfer is one of the most effective ways to provide flexible power for mobile devices. Whereas, in practical application, because of the skin-effect loss and proximity-effect loss, when the inductive power transfer system works at high frequency (MHz), the resistance of coil would increase rapidly. The increase of coil resistance leads to the decrease of power amount and transmission efficiency. Therefore, a spatial spiral layout was proposed, which can significantly reduce the skin-effect and proximity-effect loss at high operation frequency. The special coil structure can significantly decrease the resistance of coil and improve the power amount and transmission efficiency of inductive power transfer system at high frequency operation.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130434682","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709490
Achim Vedde, M. Neuburger, C. Cheshire, F. Gliese
In this paper, a hybrid common mode EMI filter is presented. The EMI filter used consists of a passive EMI filter with an added active feedback loop. The passive components are not only used for the noise attenuation but also for measuring the noise and inserting the feedback signal. The noise is measured at the common mode choke on an additional winding and is fed back inversely amplified via the Y capacitors. This technique reduces the unwanted noise current by inserting a counter current. With the topology used, the size of the common mode choke can be reduced significantly in comparison to a pure passive EMI filter. The calculation of the proposed hybrid filter design as well as the implementation and noise measurements are shown in this paper. The hybrid EMI filter is compared with a passive EMI filter to display its advantages.
{"title":"Optimization of a Passive Common Mode EMI Filter by Adding an Active Feedback Loop","authors":"Achim Vedde, M. Neuburger, C. Cheshire, F. Gliese","doi":"10.1109/SPEC52827.2021.9709490","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709490","url":null,"abstract":"In this paper, a hybrid common mode EMI filter is presented. The EMI filter used consists of a passive EMI filter with an added active feedback loop. The passive components are not only used for the noise attenuation but also for measuring the noise and inserting the feedback signal. The noise is measured at the common mode choke on an additional winding and is fed back inversely amplified via the Y capacitors. This technique reduces the unwanted noise current by inserting a counter current. With the topology used, the size of the common mode choke can be reduced significantly in comparison to a pure passive EMI filter. The calculation of the proposed hybrid filter design as well as the implementation and noise measurements are shown in this paper. The hybrid EMI filter is compared with a passive EMI filter to display its advantages.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127490160","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709309
Ngetich E Kiprotich, Jean de Dieu Hakizimana, Enock Chambile
East Africa’s electrification is at odds with United Nations goals to provide clean modern energy for all by 2030 despite possessing a vast potential for Renewable energy (RE). The increasing demand for energy coupled with continuous reliance on non-renewable energy resources as the least-cost power generation option contributes highly to climate change. This study aims to explore the implication of RE transition on the cost of electricity generation and greenhouse gas emission. The study applied a scenario capacity expansion model (System Planning Test) to investigate the implication of changing penetration level of RE from the reference least-cost solution in existing policy documents on the overall costs of building and operating an electrical system and the derived carbon dioxide emission level. The results showed that the relationship between RE and the electricity system cost is nonlinear. This implies that small changes in the level of renewable penetration relative to the least-cost solution result in small changes in the system costs while large deviation leads to large changes in the system costs. The higher levels of RE deployment lead to high reduction of carbon dioxide but with higher overall system costs. While lower levels of RE leads to higher carbon dioxide emission levels at lower system costs. Thus evaluating the trade-off between emission saving and system cost, shows that cost of avoiding emissions is incremental to RE deployment and declines as RE is curtailed. Thus initiatives to promote RE growth in order to meet the Sustainable Development Goals have been proposed.
{"title":"Exploring Implication of Renewable Energy Transition on the Cost of Electricity and Green House Gases Emission in East African Countries","authors":"Ngetich E Kiprotich, Jean de Dieu Hakizimana, Enock Chambile","doi":"10.1109/SPEC52827.2021.9709309","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709309","url":null,"abstract":"East Africa’s electrification is at odds with United Nations goals to provide clean modern energy for all by 2030 despite possessing a vast potential for Renewable energy (RE). The increasing demand for energy coupled with continuous reliance on non-renewable energy resources as the least-cost power generation option contributes highly to climate change. This study aims to explore the implication of RE transition on the cost of electricity generation and greenhouse gas emission. The study applied a scenario capacity expansion model (System Planning Test) to investigate the implication of changing penetration level of RE from the reference least-cost solution in existing policy documents on the overall costs of building and operating an electrical system and the derived carbon dioxide emission level. The results showed that the relationship between RE and the electricity system cost is nonlinear. This implies that small changes in the level of renewable penetration relative to the least-cost solution result in small changes in the system costs while large deviation leads to large changes in the system costs. The higher levels of RE deployment lead to high reduction of carbon dioxide but with higher overall system costs. While lower levels of RE leads to higher carbon dioxide emission levels at lower system costs. Thus evaluating the trade-off between emission saving and system cost, shows that cost of avoiding emissions is incremental to RE deployment and declines as RE is curtailed. Thus initiatives to promote RE growth in order to meet the Sustainable Development Goals have been proposed.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127838642","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709480
Alphonse Kwitonda, Ir. Mulugeta GebreHiwot GebreMichael, Eric Nziyumva
Energy plays an important role in the global economy and the significant portion of global energy demand is met by burning fossil fuels which are non-renewable and with limited lifespan. One of the difficulties the electrical industry is facing currently is the production and efficiency utilization of energy. Due to environmental issues, the entire world is encouraged to develop different renewable energy technologies in electrical power generation to save the planet. The energy is managed well by bringing in an efficiency, reliable and environmentally friendly storage system. A very well-known worldwide energy storage technology is chemical battery. However, due to short life span of chemical batteries, the intermittency of solar energy, and its environmental issues, pumped hydroelectric energy storage technology has been found advantageous. In this paper, the study and analysis of power generation and load demand on the Rwandan network have been done to know the availability of renewable energy which needs to be stored during light loads and released during peak loads hours. As per the study, there are 204 MWh which can be stored on daily basis. After concluding that Rwandan electric network has renewable energies to be stored during light loads, the survey around Lake Kivu on Rwandan side to find out the candidate places suited for pumped hydroelectric energy storage have been carried out where one site among five candidate sites has been selected as the best-suited place. Then, 36 MW pumped hydropower plant has been designed and its operational economic feasibility study has been also done. Simulation with MATLAB/Simulink has been carried out. The study results show that currently having the storage system will remove completely 27.6% of diesel power generation on Rwandan electric network. Moreover, the studies confirmed better operability of the system with a round trip efficiency of 81%.
{"title":"Technical Feasibility Study of Pumped Storage Hydro Power Plant on Lake Kivu","authors":"Alphonse Kwitonda, Ir. Mulugeta GebreHiwot GebreMichael, Eric Nziyumva","doi":"10.1109/SPEC52827.2021.9709480","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709480","url":null,"abstract":"Energy plays an important role in the global economy and the significant portion of global energy demand is met by burning fossil fuels which are non-renewable and with limited lifespan. One of the difficulties the electrical industry is facing currently is the production and efficiency utilization of energy. Due to environmental issues, the entire world is encouraged to develop different renewable energy technologies in electrical power generation to save the planet. The energy is managed well by bringing in an efficiency, reliable and environmentally friendly storage system. A very well-known worldwide energy storage technology is chemical battery. However, due to short life span of chemical batteries, the intermittency of solar energy, and its environmental issues, pumped hydroelectric energy storage technology has been found advantageous. In this paper, the study and analysis of power generation and load demand on the Rwandan network have been done to know the availability of renewable energy which needs to be stored during light loads and released during peak loads hours. As per the study, there are 204 MWh which can be stored on daily basis. After concluding that Rwandan electric network has renewable energies to be stored during light loads, the survey around Lake Kivu on Rwandan side to find out the candidate places suited for pumped hydroelectric energy storage have been carried out where one site among five candidate sites has been selected as the best-suited place. Then, 36 MW pumped hydropower plant has been designed and its operational economic feasibility study has been also done. Simulation with MATLAB/Simulink has been carried out. The study results show that currently having the storage system will remove completely 27.6% of diesel power generation on Rwandan electric network. Moreover, the studies confirmed better operability of the system with a round trip efficiency of 81%.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130206196","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709436
Nipuna Rajapaksha, S. Jayasinghe, H. Enshaei, N. Jayarathne
Three-phase induction motors (IMs) are one of the most employed electric machines in industrial and household applications. Condition monitoring of these machines is essential to avoid unplanned maintenance and thereby enhance the availability. Artificial Intelligence (AI) technologies are emerging as an advanced tool for automating condition monitoring process to detect incipient faults at early stages. Machine Learning (ML) algorithms have been identified as a promising approach for condition monitoring of IMs and predicting maintenance to avoid failures. However, selecting the suitable ML algorithm for a given application is challenging because there is no predefined set of application-based algorithms. In addition, raw data processing and feature selection need careful attention to improve the accuracy of the results. This paper reviews supervised ML algorithms that can be used for condition monitoring of IMs and identifies their benefits and drawbacks. It then discusses how the dominant features from raw data can be selected through time domain and frequency domain analysis using the acoustic data collected from a three-phase induction motor. The study investigates classification accuracy of each ML algorithm and a procedure for selecting an algorithm based on the experimental results. Results of this study show that Support Vector Machines (SVM) algorithm outperforms other competing algorithms in condition monitoring of IMs when the dominant frequency components obtained through Fast Fourier Transform (FFT) are used as training data.
{"title":"Supervised Machine Learning Algorithm Selection for Condition Monitoring of Induction Motors","authors":"Nipuna Rajapaksha, S. Jayasinghe, H. Enshaei, N. Jayarathne","doi":"10.1109/SPEC52827.2021.9709436","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709436","url":null,"abstract":"Three-phase induction motors (IMs) are one of the most employed electric machines in industrial and household applications. Condition monitoring of these machines is essential to avoid unplanned maintenance and thereby enhance the availability. Artificial Intelligence (AI) technologies are emerging as an advanced tool for automating condition monitoring process to detect incipient faults at early stages. Machine Learning (ML) algorithms have been identified as a promising approach for condition monitoring of IMs and predicting maintenance to avoid failures. However, selecting the suitable ML algorithm for a given application is challenging because there is no predefined set of application-based algorithms. In addition, raw data processing and feature selection need careful attention to improve the accuracy of the results. This paper reviews supervised ML algorithms that can be used for condition monitoring of IMs and identifies their benefits and drawbacks. It then discusses how the dominant features from raw data can be selected through time domain and frequency domain analysis using the acoustic data collected from a three-phase induction motor. The study investigates classification accuracy of each ML algorithm and a procedure for selecting an algorithm based on the experimental results. Results of this study show that Support Vector Machines (SVM) algorithm outperforms other competing algorithms in condition monitoring of IMs when the dominant frequency components obtained through Fast Fourier Transform (FFT) are used as training data.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133994593","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709460
Shaetrun Pathmanathan, Amir Hakemibarabadi, M. Vilathgamuwa
A growing heart failure population necessitates medical interventions beyond which waiting for transplants can provide. Ventricular Assist Devices (VAD) have proven a preliminarily successful bridging therapy until transplantation. Developments have enabled VADs as a destination therapy, potentially avoiding life threatening circumstances while on the transplant waiting list. The percutaneous driveline required to power, control and measure VAD performance threatens life extension premise with infections. Wireless power and data transfer proves a promising solution. To enable its demand flexibility, a feedback loop that can function despite implant environment complications, is required. This research explores the development and analysis of wireless power transfer assistive feedback communications, to reveal feedback loop delays caused by the implant environment and the hardware itself.Numerical estimates and Finite Element Simulations (FES) establish the presence of delay to a Medical Implant Communications Service (MICS) band radiofrequency signal. Experimental measurements, confirm the presence of environmentally inherent delays. Signaled measurements indicate significantly larger systemic delays. Inductive Power Transmission (IPT) simulations indicate adverse effects to the IPT system’s performance from systemic delays applied to the feedback loop. The system is adjusted to counter the effects of the adversary delay. Pre-and post-tuned responses indicate unavoidable effects of systemic delays.
{"title":"Analysis of Transcutaneous Communication Delays in a Wirelessly Powered Ventricular Assist Device","authors":"Shaetrun Pathmanathan, Amir Hakemibarabadi, M. Vilathgamuwa","doi":"10.1109/SPEC52827.2021.9709460","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709460","url":null,"abstract":"A growing heart failure population necessitates medical interventions beyond which waiting for transplants can provide. Ventricular Assist Devices (VAD) have proven a preliminarily successful bridging therapy until transplantation. Developments have enabled VADs as a destination therapy, potentially avoiding life threatening circumstances while on the transplant waiting list. The percutaneous driveline required to power, control and measure VAD performance threatens life extension premise with infections. Wireless power and data transfer proves a promising solution. To enable its demand flexibility, a feedback loop that can function despite implant environment complications, is required. This research explores the development and analysis of wireless power transfer assistive feedback communications, to reveal feedback loop delays caused by the implant environment and the hardware itself.Numerical estimates and Finite Element Simulations (FES) establish the presence of delay to a Medical Implant Communications Service (MICS) band radiofrequency signal. Experimental measurements, confirm the presence of environmentally inherent delays. Signaled measurements indicate significantly larger systemic delays. Inductive Power Transmission (IPT) simulations indicate adverse effects to the IPT system’s performance from systemic delays applied to the feedback loop. The system is adjusted to counter the effects of the adversary delay. Pre-and post-tuned responses indicate unavoidable effects of systemic delays.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122591780","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709461
Jayani Karunarathna, U. Madawala, C. Baguley, F. Blaabjerg, Monika Sandelic
Fast electric vehicle charging systems (FEVCSs) are becoming popular, but to assure long-term operation, further research on battery lifetime is necessary. This is because FEVCSs use high charging currents, and consequently subject Li-Ion batteries to high levels of average state of charge (SOC) and temperatures within a short period of time. Thus, degradation mechanisms, such as Lithium plating and electrolyte breakdown, are inevitable in Li-Ion batteries, leading to reduced battery capacity and lifetime. Therefore to investigate the battery reliability of FEVCSs, this paper proposes a two-stage modeling approach. Using the proposed model, the impact of SOC and temperature on the reliability of the battery as well as the reliability of a Li-Ion battery under typical fast EV charging conditions are investigated, and results are presented to show how the battery reliability deteriorates under fast charging conditions.
{"title":"Battery Reliability of Fast Electric Vehicle Charging Systems","authors":"Jayani Karunarathna, U. Madawala, C. Baguley, F. Blaabjerg, Monika Sandelic","doi":"10.1109/SPEC52827.2021.9709461","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709461","url":null,"abstract":"Fast electric vehicle charging systems (FEVCSs) are becoming popular, but to assure long-term operation, further research on battery lifetime is necessary. This is because FEVCSs use high charging currents, and consequently subject Li-Ion batteries to high levels of average state of charge (SOC) and temperatures within a short period of time. Thus, degradation mechanisms, such as Lithium plating and electrolyte breakdown, are inevitable in Li-Ion batteries, leading to reduced battery capacity and lifetime. Therefore to investigate the battery reliability of FEVCSs, this paper proposes a two-stage modeling approach. Using the proposed model, the impact of SOC and temperature on the reliability of the battery as well as the reliability of a Li-Ion battery under typical fast EV charging conditions are investigated, and results are presented to show how the battery reliability deteriorates under fast charging conditions.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125506092","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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