Pub Date : 2018-09-01DOI: 10.1109/ECCE.2018.8557355
M. Iacchetti, R. Deodhar, Alexander C. Smith, K. Mishima
The performance of a high-speed air-cored induction machine (IMs) using capacitors to provide resonant operation is analyzed in this paper. Resonance can be obtained using the stator and rotor capacitors appropriately tuned with the machine inductances, though alternative options may be considered instead of rotor capacitors. The aim is to develop a simple analytical model for air-cored resonant induction machines and to use this to obtain an understanding of the operating principles and the limitations and issues. The analysis is based on the classical IM equivalent circuit supplemented with stator and rotor capacitors and considers different control scenarios to derive key expressions for resonance conditions, capacitor values, peak torque and efficiency and related slip values. The aim of this paper is to provide a full understanding of air-cored resonant IMs to assess the practicality of these machines.
{"title":"Modelling and Operating Characteristics of Air-Cored Resonant Induction Machines","authors":"M. Iacchetti, R. Deodhar, Alexander C. Smith, K. Mishima","doi":"10.1109/ECCE.2018.8557355","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8557355","url":null,"abstract":"The performance of a high-speed air-cored induction machine (IMs) using capacitors to provide resonant operation is analyzed in this paper. Resonance can be obtained using the stator and rotor capacitors appropriately tuned with the machine inductances, though alternative options may be considered instead of rotor capacitors. The aim is to develop a simple analytical model for air-cored resonant induction machines and to use this to obtain an understanding of the operating principles and the limitations and issues. The analysis is based on the classical IM equivalent circuit supplemented with stator and rotor capacitors and considers different control scenarios to derive key expressions for resonance conditions, capacitor values, peak torque and efficiency and related slip values. The aim of this paper is to provide a full understanding of air-cored resonant IMs to assess the practicality of these machines.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114311279","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 : 2018-09-01DOI: 10.1109/ECCE.2018.8557934
N. B. de Freitas, C. Jacobina, M. Cunha, J. P. R. A. Méllo
In this paper, three multilevel single-phase converters with two dc sources and two shared legs are proposed and applied as inverters. One configuration has five legs and the other has eight legs. The configurations utilize injection transformers and, when isolation is not required, one transformer can be removed of proposed and conventional configurations. The calculation of the transformers turns ratio that improve the system symmetry is provided. The proposed configurations are compared with cascaded h-bridge and a single-phase shared leg converter with one dc source in terms of several characteristics. Compared with the conventional configurations, the proposed ones have more levels per transformer when the configurations have the same number of legs. The proposed configurations are interesting in terms of semiconductor losses for high voltage and low current applications. Experimental results are shown to demonstrate the feasibility of the system.
{"title":"Cascaded Transformer Symmetric Single-Phase Converters with Two DC Sources","authors":"N. B. de Freitas, C. Jacobina, M. Cunha, J. P. R. A. Méllo","doi":"10.1109/ECCE.2018.8557934","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8557934","url":null,"abstract":"In this paper, three multilevel single-phase converters with two dc sources and two shared legs are proposed and applied as inverters. One configuration has five legs and the other has eight legs. The configurations utilize injection transformers and, when isolation is not required, one transformer can be removed of proposed and conventional configurations. The calculation of the transformers turns ratio that improve the system symmetry is provided. The proposed configurations are compared with cascaded h-bridge and a single-phase shared leg converter with one dc source in terms of several characteristics. Compared with the conventional configurations, the proposed ones have more levels per transformer when the configurations have the same number of legs. The proposed configurations are interesting in terms of semiconductor losses for high voltage and low current applications. Experimental results are shown to demonstrate the feasibility of the system.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114325750","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 : 2018-09-01DOI: 10.1109/ECCE.2018.8557520
Chao Wu, H. Nian, Qi Zhou, P. Cheng, B. Pang, Dan Sun
This paper proposes a novel harmonic impedance modeling method of doubly fed induction generator (DFIG) considering the dead time effect. The dead time of the rotor side converter (RSC) will induce distorted voltage to the rotor side of DFIG. By obtaining the transfer function from stator voltage and rotor distorted voltage to stator current, the admittance of RSC+DFIG can be deduced. Considering that the harmonic currents caused by the dead time work as a current source, the Norton equivalent circuit of RSC+DFIG can be obtained. In this way, the harmonic currents not only caused by the grid harmonic voltages but also the dead time effect can be both accurately acquired, which is very useful for the harmonic currents analysis for wind farm. Furthermore, the impedance characteristic of RSC+DFIG is also obtained which is useful for harmonic resonance analysis. Finally, the correctness of the equivalent circuit and stator harmonic currents is validated by the simulation results.
{"title":"Harmonic Impedance Modeling of DFIG Considering Dead Time Effect of Rotor Side Converter","authors":"Chao Wu, H. Nian, Qi Zhou, P. Cheng, B. Pang, Dan Sun","doi":"10.1109/ECCE.2018.8557520","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8557520","url":null,"abstract":"This paper proposes a novel harmonic impedance modeling method of doubly fed induction generator (DFIG) considering the dead time effect. The dead time of the rotor side converter (RSC) will induce distorted voltage to the rotor side of DFIG. By obtaining the transfer function from stator voltage and rotor distorted voltage to stator current, the admittance of RSC+DFIG can be deduced. Considering that the harmonic currents caused by the dead time work as a current source, the Norton equivalent circuit of RSC+DFIG can be obtained. In this way, the harmonic currents not only caused by the grid harmonic voltages but also the dead time effect can be both accurately acquired, which is very useful for the harmonic currents analysis for wind farm. Furthermore, the impedance characteristic of RSC+DFIG is also obtained which is useful for harmonic resonance analysis. Finally, the correctness of the equivalent circuit and stator harmonic currents is validated by the simulation results.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116140757","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 : 2018-09-01DOI: 10.1109/ECCE.2018.8557988
Juncheng Lu, Ruoyu Hou, Di Chen
The market and opportunities are growing for GaN HEMTs in high-power applications. In many cases, GaN HEMTs need to be paralleled to increase the power capability or to enhance the efficiency. Unbalanced loss distribution among paralleled switches could cause overtemperature issues potentially, which will result in the derating of the power stage or even cause system failure. An analytical loss model is derived to analyze the tolerance of device characteristics variation for parallel. An auto-balancing mechanism for both switching loss and conduction loss is observed with paralleled GaN HEMTs due to the negative temperature coefficient of transconductance in the whole operating range. Stable operation is expected under all conditions without preselecting GaN HEMTs for parallel. Metal-core PCB based 240A/650V power modules are built with randomly selected GaN HEMTs and tested under high-power conditions. The junction temperatures of paralleled GaN HEMTs are measured to monitor the loss distribution, and the characteristic of GaN HEMTs in parallel is verified.
{"title":"Loss Distribution among Paralleled GaN HEMTs","authors":"Juncheng Lu, Ruoyu Hou, Di Chen","doi":"10.1109/ECCE.2018.8557988","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8557988","url":null,"abstract":"The market and opportunities are growing for GaN HEMTs in high-power applications. In many cases, GaN HEMTs need to be paralleled to increase the power capability or to enhance the efficiency. Unbalanced loss distribution among paralleled switches could cause overtemperature issues potentially, which will result in the derating of the power stage or even cause system failure. An analytical loss model is derived to analyze the tolerance of device characteristics variation for parallel. An auto-balancing mechanism for both switching loss and conduction loss is observed with paralleled GaN HEMTs due to the negative temperature coefficient of transconductance in the whole operating range. Stable operation is expected under all conditions without preselecting GaN HEMTs for parallel. Metal-core PCB based 240A/650V power modules are built with randomly selected GaN HEMTs and tested under high-power conditions. The junction temperatures of paralleled GaN HEMTs are measured to monitor the loss distribution, and the characteristic of GaN HEMTs in parallel is verified.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116327504","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 : 2018-09-01DOI: 10.1109/ECCE.2018.8557661
N. F. Roslan, A. Luna, J. Rocabert, J. I. Candela, P. Rodríguez
The control of active and reactive power for the Renewable Energy Sources (RES) based power plants are very important. The injection of active and reactive power to the grid is normally controlled at the Point of Common Connection (PCC) where this point is typically far away from the power converter station. This paper proposed a controlling principle which is based on virtual flux approach that permits to control remotely the power injected at the PCC. The results will show that the Virtual Flux (VF) estimation is capable to estimate the grid voltage in any point of the network as well as the capability of the control principle to inject the specific amount of active and reactive power at a point that can be some kilometers away. In this paper, the basic principle for the remote power control is presented and the effectiveness of the proposed system has been validated by experimental studies.
{"title":"Remote Power Control Strategy Based on Virtual Flux Approach for the Grid Tied Power Converters","authors":"N. F. Roslan, A. Luna, J. Rocabert, J. I. Candela, P. Rodríguez","doi":"10.1109/ECCE.2018.8557661","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8557661","url":null,"abstract":"The control of active and reactive power for the Renewable Energy Sources (RES) based power plants are very important. The injection of active and reactive power to the grid is normally controlled at the Point of Common Connection (PCC) where this point is typically far away from the power converter station. This paper proposed a controlling principle which is based on virtual flux approach that permits to control remotely the power injected at the PCC. The results will show that the Virtual Flux (VF) estimation is capable to estimate the grid voltage in any point of the network as well as the capability of the control principle to inject the specific amount of active and reactive power at a point that can be some kilometers away. In this paper, the basic principle for the remote power control is presented and the effectiveness of the proposed system has been validated by experimental studies.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"76 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116350378","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 : 2018-09-01DOI: 10.1109/ECCE.2018.8557580
S. Hazra, S. Bhattacharya
In this paper, a control strategy is presented to operate a dual active bridge (DAB) converter at optimal operating point in terms of minimized reactive component of current. To interface a supercapacitor based energy storage system with the dc grid to absorb oscillating energy a DAB can be used. A DAB can provide galvanic isolation and can cater high voltage gain required to integrate a low voltage supercapacitor module with a higher voltage dc-link (voltage ratio more than 5). During operation, the voltage of the supercapacitor varies in wide range due to storage of oscillating energy. Also, during charging of the supercapacitor from zero voltage at the start of the operation and discharging to zero voltage at the end of the operation the voltage ratio varies from $infty$ to 1.0. Due to large deviation of the voltage ratio from unity the reactive power in the DAB is increased. To minimize the reactive power flow an optimization method based on fundamental components is presented in this paper. By reducing the reactive component of the current overall current of the DAB for a fixed power flow is reduced. Experimental results showing implementation of the optimal solution are presented.
{"title":"Minimizing Reactive Current of a High Gain Dual Active Bridge Converter for Supercapacitor Based Energy Storage System Integration","authors":"S. Hazra, S. Bhattacharya","doi":"10.1109/ECCE.2018.8557580","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8557580","url":null,"abstract":"In this paper, a control strategy is presented to operate a dual active bridge (DAB) converter at optimal operating point in terms of minimized reactive component of current. To interface a supercapacitor based energy storage system with the dc grid to absorb oscillating energy a DAB can be used. A DAB can provide galvanic isolation and can cater high voltage gain required to integrate a low voltage supercapacitor module with a higher voltage dc-link (voltage ratio more than 5). During operation, the voltage of the supercapacitor varies in wide range due to storage of oscillating energy. Also, during charging of the supercapacitor from zero voltage at the start of the operation and discharging to zero voltage at the end of the operation the voltage ratio varies from $infty$ to 1.0. Due to large deviation of the voltage ratio from unity the reactive power in the DAB is increased. To minimize the reactive power flow an optimization method based on fundamental components is presented in this paper. By reducing the reactive component of the current overall current of the DAB for a fixed power flow is reduced. Experimental results showing implementation of the optimal solution are presented.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"23 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113979629","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 : 2018-09-01DOI: 10.1109/ECCE.2018.8558239
Sufei Li, Cheng Gong, J. Mayor, R. Harley, T. Habetler
This paper proposes a computationally efficient method to analyze the eddy current loss of the stator winding strands in the end stator region of large synchronous generators. The stepped shape with increased radii of the stator end packets exposes the stator coils to the intensive radial airgap flux and leads to winding temperature rise due to the resultant eddy currents. In the end region, the profile of the proximity loss induced by the slot leakage flux varies axially due to the variation of the slot configuration. In this paper, a quasi-3D formulation of the generator end region is adopted to account for the impacts of the stepped stator geometries and end fringing effect on the airgap flux. Then, the airgap flux impinging each copper strand is solved based on the conformal mapping method that allows for the slotting effect. Furthermore, a subdomain field model is proposed to predict the cross-slot leakage flux distribution with different slot/coil configurations. The strand eddy current loss density is then estimated based on the magnetic field solved in this region. The method is verified by the agreement between the results generated by the proposed efficient method and the corresponding 3D finite element analyses (FEAs), which are validated by the agreement between their predicted results and the measured temperatures.
{"title":"Efficient Calculation of the Strand Eddy Current Loss Distributions in the End Stepped-Stator Region of Large Synchronous Generators","authors":"Sufei Li, Cheng Gong, J. Mayor, R. Harley, T. Habetler","doi":"10.1109/ECCE.2018.8558239","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8558239","url":null,"abstract":"This paper proposes a computationally efficient method to analyze the eddy current loss of the stator winding strands in the end stator region of large synchronous generators. The stepped shape with increased radii of the stator end packets exposes the stator coils to the intensive radial airgap flux and leads to winding temperature rise due to the resultant eddy currents. In the end region, the profile of the proximity loss induced by the slot leakage flux varies axially due to the variation of the slot configuration. In this paper, a quasi-3D formulation of the generator end region is adopted to account for the impacts of the stepped stator geometries and end fringing effect on the airgap flux. Then, the airgap flux impinging each copper strand is solved based on the conformal mapping method that allows for the slotting effect. Furthermore, a subdomain field model is proposed to predict the cross-slot leakage flux distribution with different slot/coil configurations. The strand eddy current loss density is then estimated based on the magnetic field solved in this region. The method is verified by the agreement between the results generated by the proposed efficient method and the corresponding 3D finite element analyses (FEAs), which are validated by the agreement between their predicted results and the measured temperatures.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124322798","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 : 2018-09-01DOI: 10.1109/ECCE.2018.8558410
Ye Tang, R. Burgos, Chi Li, D. Boroyevich
Per the latest revision of the IEEE Std 1547, PV inverters will be required to provide reactive power regulation services in the near future. Accordingly, the stability impact of PV inverters in distribution grids attracts more and more attention. Compared to the positive sequence impedance method, the D-Q frame impedance matrix method is more accurate for grid-tied PV inverters that have non-symmetrical control in DQ frame, including DC voltage loop and phase locked loop (PLL). This paper uses the D-Q frame impedances of utility-scale PV farm and the generalized Nyquist Criterion (GNC) to assess the stability in medium voltage distribution grids. A comparison is done for PV farm under different Q control modes. The control mode of volt-var mode changes PV terminal impedance signs and magnitude significantly, and may cause stability problem, as a result of interaction of voltage control of multiple PV inverters in parallel. Hardware experiments show the accuracy of PV impedances from derivation based on small signal model.
{"title":"Utility-Scale PV Inverter Impedances in D-Q Frame Under Different Q-Control Modes","authors":"Ye Tang, R. Burgos, Chi Li, D. Boroyevich","doi":"10.1109/ECCE.2018.8558410","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8558410","url":null,"abstract":"Per the latest revision of the IEEE Std 1547, PV inverters will be required to provide reactive power regulation services in the near future. Accordingly, the stability impact of PV inverters in distribution grids attracts more and more attention. Compared to the positive sequence impedance method, the D-Q frame impedance matrix method is more accurate for grid-tied PV inverters that have non-symmetrical control in DQ frame, including DC voltage loop and phase locked loop (PLL). This paper uses the D-Q frame impedances of utility-scale PV farm and the generalized Nyquist Criterion (GNC) to assess the stability in medium voltage distribution grids. A comparison is done for PV farm under different Q control modes. The control mode of volt-var mode changes PV terminal impedance signs and magnitude significantly, and may cause stability problem, as a result of interaction of voltage control of multiple PV inverters in parallel. Hardware experiments show the accuracy of PV impedances from derivation based on small signal model.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"408 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124329255","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 : 2018-09-01DOI: 10.1109/ECCE.2018.8557936
Lalitha Subramanian, H. B Gooi
Droop scheduling plays an important role in the microgrid frequency regulation market, as the well-known proportional load sharing may be practically inapplicable in many cases of inverter-based microgrids. The drooping capability of each inverter unit in the microgrid is determined by the availability and response time of its associated energy storage. However, some renewable energy-based units may be chosen to operate at the maximum power point because of their zero fuel cost. This scenario demands some high capacity units to operate with a high or infinite droop coefficient, thereby restricting their contribution to the frequency regulation. In this work, we examine the influence of this droop variation on the small signal stability of the microgrid using the root locus technique. We then substitute some of the existing droop-controlled units with virtual inertia control at critical nodes to study the effect of coordinated droop and inertia control. Finally, the choice and size of energy storage necessary to emulate a certain level of inertia and droop are compared. The study shows that the stability of the system may be enhanced while saving on the economics of storage requirement if the inertia and droop control act in a coordinated manner.
{"title":"Stabilizing Droop Variation of Converter-Connected Generation in Autonomous Microgrids with Virtual Inertia Control","authors":"Lalitha Subramanian, H. B Gooi","doi":"10.1109/ECCE.2018.8557936","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8557936","url":null,"abstract":"Droop scheduling plays an important role in the microgrid frequency regulation market, as the well-known proportional load sharing may be practically inapplicable in many cases of inverter-based microgrids. The drooping capability of each inverter unit in the microgrid is determined by the availability and response time of its associated energy storage. However, some renewable energy-based units may be chosen to operate at the maximum power point because of their zero fuel cost. This scenario demands some high capacity units to operate with a high or infinite droop coefficient, thereby restricting their contribution to the frequency regulation. In this work, we examine the influence of this droop variation on the small signal stability of the microgrid using the root locus technique. We then substitute some of the existing droop-controlled units with virtual inertia control at critical nodes to study the effect of coordinated droop and inertia control. Finally, the choice and size of energy storage necessary to emulate a certain level of inertia and droop are compared. The study shows that the stability of the system may be enhanced while saving on the economics of storage requirement if the inertia and droop control act in a coordinated manner.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124072331","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 : 2018-09-01DOI: 10.1109/ECCE.2018.8557517
Aswad Adib, Fariba Fateh, M. Shadmand, B. Mirafzal
This paper presents a second order model for stability analysis of grid-connected voltage source inverters (VSIs). VSIs are commonly modeled as ideal voltage sources for analysis. However, this approach cannot guarantee accuracy since it does not take into consideration the dominant states of the inverter. In this paper, a reduced-order model based on balanced truncation method is derived from a comprehensive twelfth-order model for a grid-connected VSI. The developed second-order model is computationally modest while providing an accurate representation of the system characteristic. The efficacy of the developed model is verified through time-domain simulations and root locus studies of the model eigenvalues against its full-order counterpart.
{"title":"A Reduced-Order Technique for Stability Investigation of Voltage Source Inverters","authors":"Aswad Adib, Fariba Fateh, M. Shadmand, B. Mirafzal","doi":"10.1109/ECCE.2018.8557517","DOIUrl":"https://doi.org/10.1109/ECCE.2018.8557517","url":null,"abstract":"This paper presents a second order model for stability analysis of grid-connected voltage source inverters (VSIs). VSIs are commonly modeled as ideal voltage sources for analysis. However, this approach cannot guarantee accuracy since it does not take into consideration the dominant states of the inverter. In this paper, a reduced-order model based on balanced truncation method is derived from a comprehensive twelfth-order model for a grid-connected VSI. The developed second-order model is computationally modest while providing an accurate representation of the system characteristic. The efficacy of the developed model is verified through time-domain simulations and root locus studies of the model eigenvalues against its full-order counterpart.","PeriodicalId":415217,"journal":{"name":"2018 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124111349","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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