Pub Date : 2018-10-01DOI: 10.1109/ACEPT.2018.8610667
Shengwen Li, Jinhao Wang, Tan Wang, Huijie Du, Yongze Duan, Han Gao, Runquan Meng, Lei Wang, Xiaoqing Han, Ming Wei, Bingjie Zhao, Peng Wang, L. Koh, Jianfang Xiao
In hybrid micro grid, the bidirectional AC/DC power converter (BIC) is required to guarantee voltage stability and power balance of AC and DC sub-grid. Based on analyzing the main circuit of BIC, this paper proposes a control strategy that not only realizes the function of bidirectional power conversion but also suppresses harmonic current. This control strategy combines the harmonic current detection algorithm based on Fryze-Buchholz-Depenbrock power theory and bidirectional power converting method. The control command for controlling the BIC to suppress the harmonic current is obtained by the proposed control strategy. Finally, the validity and practicability of the control strategy are verified by simulations.
{"title":"The Bidirectional AC/DC Power Converter with Capability of Suppressing the Harmonic Current in Hybrid Micro Grid","authors":"Shengwen Li, Jinhao Wang, Tan Wang, Huijie Du, Yongze Duan, Han Gao, Runquan Meng, Lei Wang, Xiaoqing Han, Ming Wei, Bingjie Zhao, Peng Wang, L. Koh, Jianfang Xiao","doi":"10.1109/ACEPT.2018.8610667","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610667","url":null,"abstract":"In hybrid micro grid, the bidirectional AC/DC power converter (BIC) is required to guarantee voltage stability and power balance of AC and DC sub-grid. Based on analyzing the main circuit of BIC, this paper proposes a control strategy that not only realizes the function of bidirectional power conversion but also suppresses harmonic current. This control strategy combines the harmonic current detection algorithm based on Fryze-Buchholz-Depenbrock power theory and bidirectional power converting method. The control command for controlling the BIC to suppress the harmonic current is obtained by the proposed control strategy. Finally, the validity and practicability of the control strategy are verified by simulations.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121805854","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 : 2018-10-01DOI: 10.1109/ACEPT.2018.8610729
Zih-Siang Huang, T. Liang, Kai-Hui Chen, Wei-Jing Tseng, Pin-Yi Liu
In this paper, a novel retrofit LED(Lighting-emitting diode) is proposed to replace the T8/40W fluorescent lamp. The proposed retrofit LED lamp contains a frequency sensing circuits, driving circuit and LED module, which is suitable for AC grid, electromagnetic ballast, and electronic ballast applications. The advantages of the proposed retrofit LED lamp are small size and easy to design. The frequency sensing circuits is constructed of a low-pass filter, peak detector circuit, and voltage comparator to clarify the input voltage frequency of the retrofit LED lamp. The operational principles of the proposed retrofit LED is analyzed and the key parameters of the proposed retrofit LED are designed. Then, the simulation software is used to verify the feasibility of the proposed retrofit LED lamp. Finally, a 22W retrofit LED prototype is built in the laboratory for both ballasts and universal AC grid voltage applications.
{"title":"Design and Implementation of a Novel Retrofit LED Lamp","authors":"Zih-Siang Huang, T. Liang, Kai-Hui Chen, Wei-Jing Tseng, Pin-Yi Liu","doi":"10.1109/ACEPT.2018.8610729","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610729","url":null,"abstract":"In this paper, a novel retrofit LED(Lighting-emitting diode) is proposed to replace the T8/40W fluorescent lamp. The proposed retrofit LED lamp contains a frequency sensing circuits, driving circuit and LED module, which is suitable for AC grid, electromagnetic ballast, and electronic ballast applications. The advantages of the proposed retrofit LED lamp are small size and easy to design. The frequency sensing circuits is constructed of a low-pass filter, peak detector circuit, and voltage comparator to clarify the input voltage frequency of the retrofit LED lamp. The operational principles of the proposed retrofit LED is analyzed and the key parameters of the proposed retrofit LED are designed. Then, the simulation software is used to verify the feasibility of the proposed retrofit LED lamp. Finally, a 22W retrofit LED prototype is built in the laboratory for both ballasts and universal AC grid voltage applications.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121217119","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 : 2018-10-01DOI: 10.1109/ACEPT.2018.8610772
S. Ooi, S. Mazzoni, A. Romagnoli
Natural Gas (NG), which represents 95% of the fuel mix in stationary power generation in Singapore, has been seen as the replacement of traditional pollutant-heavy fuels such as diesel. In the microgrid context, NG is a crucial raw material for powering principal components such as the Reciprocating Engine (RE), which provides the base load when the microgrid is in islanded mode. In this study, the effect of NG prices on the financial viability of operating a microgrid which integrates Combined Heat and Power, solar PV, electrochemical storage, vapour chiller and the main grid has been investigated. The economic dispatch of the components indicate that at an increase of NG price by 20 cents reduces the operating hours per day of the RE by nearly half, with the option of purchasing from the grid preferred instead. Furthermore, at a higher fuel price the battery is required to operate at a heavier duty cycle, thus reducing its lifetime. A positive Net Present Value (NPV) in the order of millions of SGD is obtained in the NG price range of SGD0.4-0.6 per kg after 20 years, whilst at a price of SGD0.8 per kg, the microgrid fails to provide a positive NPV. The option of regasification of LNG prior to feeding it into the RE has been found to provide a maximum amount of cold energy in the region of 500kWh per day.
{"title":"A Microgrid Application of Polygeneration System Fed by Natural Gas: Effect of Fuel Price on Investment Outlook","authors":"S. Ooi, S. Mazzoni, A. Romagnoli","doi":"10.1109/ACEPT.2018.8610772","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610772","url":null,"abstract":"Natural Gas (NG), which represents 95% of the fuel mix in stationary power generation in Singapore, has been seen as the replacement of traditional pollutant-heavy fuels such as diesel. In the microgrid context, NG is a crucial raw material for powering principal components such as the Reciprocating Engine (RE), which provides the base load when the microgrid is in islanded mode. In this study, the effect of NG prices on the financial viability of operating a microgrid which integrates Combined Heat and Power, solar PV, electrochemical storage, vapour chiller and the main grid has been investigated. The economic dispatch of the components indicate that at an increase of NG price by 20 cents reduces the operating hours per day of the RE by nearly half, with the option of purchasing from the grid preferred instead. Furthermore, at a higher fuel price the battery is required to operate at a heavier duty cycle, thus reducing its lifetime. A positive Net Present Value (NPV) in the order of millions of SGD is obtained in the NG price range of SGD0.4-0.6 per kg after 20 years, whilst at a price of SGD0.8 per kg, the microgrid fails to provide a positive NPV. The option of regasification of LNG prior to feeding it into the RE has been found to provide a maximum amount of cold energy in the region of 500kWh per day.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115369971","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}
In this article, a sequence pulse modulation (SPM) strategy is proposed to solve the problem that the DC voltage is imbalance among the modules of single-phase three-level Neutral Point Clamped Cascaded Rectifier (3LNPC-CR). The modulation achieves the DC side voltage balance of each module through three steps: (1) Phase disposition calculation; (2) SPM generator; (3) Rank function. In addition, this modulation also avoids the phenomenon of “voltage level jumping” on the grid side, which can effectively reduce the frequency of the switch. The correctness of the proposed modulation is verified by simulation and experiments.
{"title":"Sequence Pulse Modulation Strategy for Voltage Balance Based on Single-Phase Three-Level Neutral Point Clamped Cascaded Rectifier","authors":"Xiaoqiong He, Haolun Yu, Pengcheng Han, Xu Peng, Xiaoqiong He, Koh Leonghai","doi":"10.1109/ACEPT.2018.8610665","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610665","url":null,"abstract":"In this article, a sequence pulse modulation (SPM) strategy is proposed to solve the problem that the DC voltage is imbalance among the modules of single-phase three-level Neutral Point Clamped Cascaded Rectifier (3LNPC-CR). The modulation achieves the DC side voltage balance of each module through three steps: (1) Phase disposition calculation; (2) SPM generator; (3) Rank function. In addition, this modulation also avoids the phenomenon of “voltage level jumping” on the grid side, which can effectively reduce the frequency of the switch. The correctness of the proposed modulation is verified by simulation and experiments.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127169419","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 : 2018-10-01DOI: 10.1109/ACEPT.2018.8610856
Rajput Krishna Pal, D. N. Srikanth, Kannappan Lakshmanan
When we consider sea as a source of energy, tidal energy is one of the most assuring and doable options for extracting energy from the sea. The thrusting force behind the coastal hydrodynamics comes majorly from tides and their interaction with diverse coastal boundaries and it also depends on the seabed profile. The seabed profile and composition give rise to a surface roughness profile which creates a drag force on the flow and modifies the velocity field [1]. These complex characteristics are simplified to a certain level by dividing the tides effect into certain harmonic tidal constants which occurs as a combination of amplitude and phase. Alderney Race (between the islands of Alderney and the cape of La Hague, France) is one of such vital locations where tidal energy can be extracted at a large scale. In our study, the ocean boundaries are mainly forced by 8 tidal constants (Kl, K2, M2, N2, Ol, P1, Ql, S2) that provide motion to ocean water. These tidal constants are predicted from the LeProvost Tidal Database which is a set of legi files and was defined for the entire globe. Also, a quadratically varying friction coefficient function was employed to compensate for the seabed surface roughness. A finite element based 2-dimensional modeling (Advance circulation-ADCIRC) was conducted to estimate the tidal energy density in the region of Alderney Race. This model was validated with the field data collected at certain locations in Singapore and this formed a base for the validity of this model. The estimation of the average power density (APD) is derived from the velocity field, knowing APD to be proportional to the cube of the velocity value. The velocity field and tidal elevation calculated by the model are within the suitable limits as compared with the field data. This paper introduces a unique way of forecasting tidal energy power density using the open source software models and data sources with a maximum level of resolution. The data helps to site the higher tidal energy sites in a remote ocean location and thereby helps to minimize the deployment costs.
{"title":"Tidal Resource Modeling: Alderney Race","authors":"Rajput Krishna Pal, D. N. Srikanth, Kannappan Lakshmanan","doi":"10.1109/ACEPT.2018.8610856","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610856","url":null,"abstract":"When we consider sea as a source of energy, tidal energy is one of the most assuring and doable options for extracting energy from the sea. The thrusting force behind the coastal hydrodynamics comes majorly from tides and their interaction with diverse coastal boundaries and it also depends on the seabed profile. The seabed profile and composition give rise to a surface roughness profile which creates a drag force on the flow and modifies the velocity field [1]. These complex characteristics are simplified to a certain level by dividing the tides effect into certain harmonic tidal constants which occurs as a combination of amplitude and phase. Alderney Race (between the islands of Alderney and the cape of La Hague, France) is one of such vital locations where tidal energy can be extracted at a large scale. In our study, the ocean boundaries are mainly forced by 8 tidal constants (Kl, K2, M2, N2, Ol, P1, Ql, S2) that provide motion to ocean water. These tidal constants are predicted from the LeProvost Tidal Database which is a set of legi files and was defined for the entire globe. Also, a quadratically varying friction coefficient function was employed to compensate for the seabed surface roughness. A finite element based 2-dimensional modeling (Advance circulation-ADCIRC) was conducted to estimate the tidal energy density in the region of Alderney Race. This model was validated with the field data collected at certain locations in Singapore and this formed a base for the validity of this model. The estimation of the average power density (APD) is derived from the velocity field, knowing APD to be proportional to the cube of the velocity value. The velocity field and tidal elevation calculated by the model are within the suitable limits as compared with the field data. This paper introduces a unique way of forecasting tidal energy power density using the open source software models and data sources with a maximum level of resolution. The data helps to site the higher tidal energy sites in a remote ocean location and thereby helps to minimize the deployment costs.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128940249","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 : 2018-10-01DOI: 10.1109/ACEPT.2018.8610752
S. Manoj, N. Srikanth, P. Loganathan, M. Gobikrishnan
World relies heavily on petroleum-based products which causes a concern related to future bio-degradability. The adverse effects on environment caused by hydrocarbon-based oil leads to the development of environmental friendly alternative such as biolubricants. In recent years adoption of biolubricants in automotive, locomotive, aerospace and renewable systems is increasing, especially the use of biolubricants in renewable energy system such as for wind turbine gearbox and other systems have made renewables more meaningful towards a greener environment. Biolubricants are used because of their high lubricity, low toxicity, high viscosity index, higher flash point, high load carrying, anti-wear performance capability, rapid biodegradation with near zero greenhouse gas emissions and better compatible to working personnel in terms of safety. In this study, the tribological performance of the lubricants is experimentally evaluated. The first part of the results consists of evaluation of commercially available biolubricant vs synthetic gearbox oil as per ASTM 4172 Four-ball wear test machine standard. In the second part of the results, the effect of particulate additive such as graphene in biolubricant is been evaluated when compared to no additive synthetic gearbox oil. Additive concentration ranges from 100ppm-300ppm. Four test conditions have been evolved and tested for identifying the best combinations of highest tribological performance of the selected lubricants and additives respectively. Each result shown has been repeated five times for maximum repeatability thus ensuring best results on the wear and friction properties of the lubricants under test.
{"title":"Tribological Behaviour Of Bio-Leubricant With Additive For Wind Turbine Gear Box","authors":"S. Manoj, N. Srikanth, P. Loganathan, M. Gobikrishnan","doi":"10.1109/ACEPT.2018.8610752","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610752","url":null,"abstract":"World relies heavily on petroleum-based products which causes a concern related to future bio-degradability. The adverse effects on environment caused by hydrocarbon-based oil leads to the development of environmental friendly alternative such as biolubricants. In recent years adoption of biolubricants in automotive, locomotive, aerospace and renewable systems is increasing, especially the use of biolubricants in renewable energy system such as for wind turbine gearbox and other systems have made renewables more meaningful towards a greener environment. Biolubricants are used because of their high lubricity, low toxicity, high viscosity index, higher flash point, high load carrying, anti-wear performance capability, rapid biodegradation with near zero greenhouse gas emissions and better compatible to working personnel in terms of safety. In this study, the tribological performance of the lubricants is experimentally evaluated. The first part of the results consists of evaluation of commercially available biolubricant vs synthetic gearbox oil as per ASTM 4172 Four-ball wear test machine standard. In the second part of the results, the effect of particulate additive such as graphene in biolubricant is been evaluated when compared to no additive synthetic gearbox oil. Additive concentration ranges from 100ppm-300ppm. Four test conditions have been evolved and tested for identifying the best combinations of highest tribological performance of the selected lubricants and additives respectively. Each result shown has been repeated five times for maximum repeatability thus ensuring best results on the wear and friction properties of the lubricants under test.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122038963","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 : 2018-10-01DOI: 10.1109/ACEPT.2018.8610849
Yuan-Chao Niu, Ying-Ting Huang, C. Chen, Yaow-Ming Chen
Comparing with the metal-oxide-semiconductor field-effect transistor (MOSFET), the switching frequency of the gallium nitride enhancement mode high electron mobility transistor (GaN E-HEMT) can be significantly increased. However, the impacts of parasitic inductance and capacitance to the circuit performance should be taken into account for design considerations. In this paper, the gate drive circuit design for GaN E-HEMT is described in detail. The effectiveness of the design considerations is fully examined by the simulation software, LTSPICE with GaN E-HEMT model introduced by Efficient Power Conversion (EPC). From the simulation results, the parasitic effects caused by the parasitic components can be clearly observed. Thus, the simulation results can provide the insight of practical design. Finally, a buck converter with 1 MHz switching frequency is built according to these design considerations.
{"title":"Design Considerations of the Gate Drive Circuit for GaN HEMT Devices","authors":"Yuan-Chao Niu, Ying-Ting Huang, C. Chen, Yaow-Ming Chen","doi":"10.1109/ACEPT.2018.8610849","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610849","url":null,"abstract":"Comparing with the metal-oxide-semiconductor field-effect transistor (MOSFET), the switching frequency of the gallium nitride enhancement mode high electron mobility transistor (GaN E-HEMT) can be significantly increased. However, the impacts of parasitic inductance and capacitance to the circuit performance should be taken into account for design considerations. In this paper, the gate drive circuit design for GaN E-HEMT is described in detail. The effectiveness of the design considerations is fully examined by the simulation software, LTSPICE with GaN E-HEMT model introduced by Efficient Power Conversion (EPC). From the simulation results, the parasitic effects caused by the parasitic components can be clearly observed. Thus, the simulation results can provide the insight of practical design. Finally, a buck converter with 1 MHz switching frequency is built according to these design considerations.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127999385","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 : 2018-10-01DOI: 10.1109/ACEPT.2018.8610671
D. Sundar, S. Narasimalu, Yang Yaowen
One of the biggest challenges wind turbines in low speed wind regions (sudden extreme wind speeds) face, is bearing the sudden and excessive loads caused by typhoons and tropical cyclones in the region. The extreme turbulence and rapid change in the wind direction and speeds are the major causes of wind turbine failures. This leads to blade pitch angle error in the traditional pitching mechanism used for load alleviation, causing large responses in terms of rotor thrust and generator torque. This can potentially lead to fatal accidents. Hence, passive load alleviation techniques are gaining ground, bend to twist coupling of anisotropic composite laminates in particular. The induced twist when the laminate is under bending loads helps reduce excessive loads in the structure. This concept can be applied to the blades of the stalled wind turbines to withstand extreme loads. Previous research findings support this hypothesis and show that eliminating the pitching subsystems can help create lighter blades that require less maintenance. In this study, five single-ply and five two-ply laminates are analysed using a MATLAB program to determine their bending-twisting coupling coefficients, strains and stresses under an applied moment. For our loading condition, the study seems to indicate that the addition of the 25° ply is optimal in terms of reducing the stresses by twisting. Further work is required in order to understand the effect of the number of plies, ply architecture, different cross-sections, etc. on the bend-twist coupling of composite structures so as to incorporate it into a wind turbine blade spar.
{"title":"Study of Bend to Twist Coupling of Composite Laminates for Passive Load Alleviation of a Wind Turbine Blade","authors":"D. Sundar, S. Narasimalu, Yang Yaowen","doi":"10.1109/ACEPT.2018.8610671","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610671","url":null,"abstract":"One of the biggest challenges wind turbines in low speed wind regions (sudden extreme wind speeds) face, is bearing the sudden and excessive loads caused by typhoons and tropical cyclones in the region. The extreme turbulence and rapid change in the wind direction and speeds are the major causes of wind turbine failures. This leads to blade pitch angle error in the traditional pitching mechanism used for load alleviation, causing large responses in terms of rotor thrust and generator torque. This can potentially lead to fatal accidents. Hence, passive load alleviation techniques are gaining ground, bend to twist coupling of anisotropic composite laminates in particular. The induced twist when the laminate is under bending loads helps reduce excessive loads in the structure. This concept can be applied to the blades of the stalled wind turbines to withstand extreme loads. Previous research findings support this hypothesis and show that eliminating the pitching subsystems can help create lighter blades that require less maintenance. In this study, five single-ply and five two-ply laminates are analysed using a MATLAB program to determine their bending-twisting coupling coefficients, strains and stresses under an applied moment. For our loading condition, the study seems to indicate that the addition of the 25° ply is optimal in terms of reducing the stresses by twisting. Further work is required in order to understand the effect of the number of plies, ply architecture, different cross-sections, etc. on the bend-twist coupling of composite structures so as to incorporate it into a wind turbine blade spar.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114708795","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 : 2018-10-01DOI: 10.1109/ACEPT.2018.8610690
Yeong-Hyeok Jang, Si-Hwan Kim, Rae-Young Kim
In this paper, a model predictive control to reduce computation is proposed for the cascaded flying capacitor cell multilevel converter. The model predictive control is limited to applying to a multilevel topology because it requires too many predicted values of the control variables to be computed. The proposed control consists of three control steps and operates step by step. There is an advantage that fewer control operation is required since the predicted value of the control variable is obtained by using the terminal voltage level. The proposed control performs input current control, DC output voltage control, and flying capacitor voltage control. The performance of the proposed model predictive control is validated by simulating CFCC multilevel converter with two FC cells.
{"title":"Model Predictive Control for Cascaded Flying Capacitor Cell Multilevel Converter","authors":"Yeong-Hyeok Jang, Si-Hwan Kim, Rae-Young Kim","doi":"10.1109/ACEPT.2018.8610690","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610690","url":null,"abstract":"In this paper, a model predictive control to reduce computation is proposed for the cascaded flying capacitor cell multilevel converter. The model predictive control is limited to applying to a multilevel topology because it requires too many predicted values of the control variables to be computed. The proposed control consists of three control steps and operates step by step. There is an advantage that fewer control operation is required since the predicted value of the control variable is obtained by using the terminal voltage level. The proposed control performs input current control, DC output voltage control, and flying capacitor voltage control. The performance of the proposed model predictive control is validated by simulating CFCC multilevel converter with two FC cells.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129729833","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 : 2018-10-01DOI: 10.1109/ACEPT.2018.8610757
Stefan Selvarajoo, M. Schläpfer, Rui Tan
In recent years, electrical load forecasting has received continuous research efforts aiming to improve the short-term prediction accuracy of local energy demands. However, current methods are not able to take explicitly into account the dynamic spatial population distribution over the course of a day, which is particularly relevant in dense urban areas. In this paper, we harness society-wide mobile phone data to map the time-varying population distribution in the Trentino region, Italy, and to use these insights for a novel electrical load forecasting method. Our results demonstrate that the integration of aggregated mobile phone data yields compelling forecast models.
{"title":"Urban Electric Load Forecasting with Mobile Phone Location Data","authors":"Stefan Selvarajoo, M. Schläpfer, Rui Tan","doi":"10.1109/ACEPT.2018.8610757","DOIUrl":"https://doi.org/10.1109/ACEPT.2018.8610757","url":null,"abstract":"In recent years, electrical load forecasting has received continuous research efforts aiming to improve the short-term prediction accuracy of local energy demands. However, current methods are not able to take explicitly into account the dynamic spatial population distribution over the course of a day, which is particularly relevant in dense urban areas. In this paper, we harness society-wide mobile phone data to map the time-varying population distribution in the Trentino region, Italy, and to use these insights for a novel electrical load forecasting method. Our results demonstrate that the integration of aggregated mobile phone data yields compelling forecast models.","PeriodicalId":296432,"journal":{"name":"2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131043299","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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