Pub Date : 2016-03-20DOI: 10.1109/APEC.2016.7467853
P. Shenoy, Orlando Lazaro, R. Ramani, Mike Amaro, W. Wiktor, J. Khayat, B. Lynch
This paper presents the first monolithically integrated two-phase series capacitor buck converter. This converter achieves over 60 A/cm3 current density. The series capacitor buck converter topology enables high frequency (HF) operation up to 5 MHz per phase without special magnetics or compound semiconductors. An adaptive constant on-time controller provides fast load transient response and fixed frequency operation in steady state. The series capacitor is precharged before switching and monitored to protect against faults. Experimental results for a 12 V input, 1.2V/10A output application demonstrate higher peak efficiency than a conventional buck converter while operating at 4 times higher switching frequency.
{"title":"A 5 MHz, 12 V, 10 A, monolithically integrated two-phase series capacitor buck converter","authors":"P. Shenoy, Orlando Lazaro, R. Ramani, Mike Amaro, W. Wiktor, J. Khayat, B. Lynch","doi":"10.1109/APEC.2016.7467853","DOIUrl":"https://doi.org/10.1109/APEC.2016.7467853","url":null,"abstract":"This paper presents the first monolithically integrated two-phase series capacitor buck converter. This converter achieves over 60 A/cm3 current density. The series capacitor buck converter topology enables high frequency (HF) operation up to 5 MHz per phase without special magnetics or compound semiconductors. An adaptive constant on-time controller provides fast load transient response and fixed frequency operation in steady state. The series capacitor is precharged before switching and monitored to protect against faults. Experimental results for a 12 V input, 1.2V/10A output application demonstrate higher peak efficiency than a conventional buck converter while operating at 4 times higher switching frequency.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126910663","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 : 2016-03-20DOI: 10.1109/APEC.2016.7468002
Jiangbiao He, N. Weise, Lixiang Wei, N. Demerdash
Reliability of multilevel power converters has received increased attention over the past few years, due to the relatively high component failure probability caused by the large number of switching devices utilized in the converter topologies. Thus, the fault-tolerant operation of multilevel converters plays an essential role in safety-critical industrial applications. This paper introduces an improved fault-tolerant inverter topology based on the conventional three-level T-Type neutral-point-clamped (NPC) inverter. Unlike other existing three-phase four-leg fault-tolerant inverter topologies, the fault-tolerant T-Type inverter topology proposed here can significantly enhance the overall thermal overload capability of the inverter, in addition to providing desired fault-tolerant capability. The operating principle of this proposed fault-tolerant T-Type inverter is detailed in this paper, and simulation results are presented to verify the advantages of this improved inverter topology.
{"title":"A fault-tolerant topology of T-Type NPC inverter with increased thermal overload capability","authors":"Jiangbiao He, N. Weise, Lixiang Wei, N. Demerdash","doi":"10.1109/APEC.2016.7468002","DOIUrl":"https://doi.org/10.1109/APEC.2016.7468002","url":null,"abstract":"Reliability of multilevel power converters has received increased attention over the past few years, due to the relatively high component failure probability caused by the large number of switching devices utilized in the converter topologies. Thus, the fault-tolerant operation of multilevel converters plays an essential role in safety-critical industrial applications. This paper introduces an improved fault-tolerant inverter topology based on the conventional three-level T-Type neutral-point-clamped (NPC) inverter. Unlike other existing three-phase four-leg fault-tolerant inverter topologies, the fault-tolerant T-Type inverter topology proposed here can significantly enhance the overall thermal overload capability of the inverter, in addition to providing desired fault-tolerant capability. The operating principle of this proposed fault-tolerant T-Type inverter is detailed in this paper, and simulation results are presented to verify the advantages of this improved inverter topology.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129078022","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 : 2016-03-20DOI: 10.1109/APEC.2016.7468090
Luca Bizjak, E. Bodano, A. Gotovac, Sergii Tkachov
This paper describes a novel concept of PWM phase and frequency synchronization. This approach applies for digitally controlled switched mode power supplies (SMPS) which need to regulate the switching frequency externally. One of the well-known advantages of having a system with a controllable switching behavior is the mitigation of the Electromagnetic Interference (EMI), which leads to the system cost reduction as a smaller input filter is required. The proposed solution overcomes analog and digital state of the art drawbacks such as limitation of the synchronization frequency range, susceptibility to noise and glitches, undesired overshoots/undershoots on the output voltage and the tuning of the IC digital clock which leads to an over-constrained design. In order to confirm the synchronization performance the proposed solution is implemented as part of an SMPS controller integrated in a 130nm BCD (Bipolar-CMOS-DMOS) technology. The output voltage over/under-shoot caused by an abrupt frequency synchronization change has been analyzed and measured. The frequency and phase settling time have been characterized with respect to various configurations. The robustness against synchronization frequency and phase noise has been measured for different noise levels.
{"title":"A digital implementation for PWM phase-frequency synchronization in SMPS systems","authors":"Luca Bizjak, E. Bodano, A. Gotovac, Sergii Tkachov","doi":"10.1109/APEC.2016.7468090","DOIUrl":"https://doi.org/10.1109/APEC.2016.7468090","url":null,"abstract":"This paper describes a novel concept of PWM phase and frequency synchronization. This approach applies for digitally controlled switched mode power supplies (SMPS) which need to regulate the switching frequency externally. One of the well-known advantages of having a system with a controllable switching behavior is the mitigation of the Electromagnetic Interference (EMI), which leads to the system cost reduction as a smaller input filter is required. The proposed solution overcomes analog and digital state of the art drawbacks such as limitation of the synchronization frequency range, susceptibility to noise and glitches, undesired overshoots/undershoots on the output voltage and the tuning of the IC digital clock which leads to an over-constrained design. In order to confirm the synchronization performance the proposed solution is implemented as part of an SMPS controller integrated in a 130nm BCD (Bipolar-CMOS-DMOS) technology. The output voltage over/under-shoot caused by an abrupt frequency synchronization change has been analyzed and measured. The frequency and phase settling time have been characterized with respect to various configurations. The robustness against synchronization frequency and phase noise has been measured for different noise levels.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129118350","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 : 2016-03-20DOI: 10.1109/APEC.2016.7468173
Zhen Xin, Rende Zhao, Xiongfei Wang, P. Loh, F. Blaabjerg
The Second-Order Generalized Integrator (SOGI) was used as a building block for the SOGI-Quadrature-Signal Generator (SOGI-QSG) which has been widely used for grid synchronization, frequency estimation, and harmonic extraction over the past decade. This paper further investigates its integration and differentiation characteristics, with four new integrators and differentiators proposed. Theoretical analysis shows that the proposed SOGI-QSG based integration and differentiation methods can effectively overcome the drawbacks of the pure integrator and differentiator. The proposed four new methods are the frequency-adaptive integrator, the frequency-adaptive differentiator, the frequency-fixed integrator and the frequency-fixed differentiator respectively. The effectiveness of the proposed methods and the correctness of the theoretical analysis are finally evaluated by experimental results.
{"title":"Four new applications of Second-Order Generalized Integrator Quadrature Signal Generator","authors":"Zhen Xin, Rende Zhao, Xiongfei Wang, P. Loh, F. Blaabjerg","doi":"10.1109/APEC.2016.7468173","DOIUrl":"https://doi.org/10.1109/APEC.2016.7468173","url":null,"abstract":"The Second-Order Generalized Integrator (SOGI) was used as a building block for the SOGI-Quadrature-Signal Generator (SOGI-QSG) which has been widely used for grid synchronization, frequency estimation, and harmonic extraction over the past decade. This paper further investigates its integration and differentiation characteristics, with four new integrators and differentiators proposed. Theoretical analysis shows that the proposed SOGI-QSG based integration and differentiation methods can effectively overcome the drawbacks of the pure integrator and differentiator. The proposed four new methods are the frequency-adaptive integrator, the frequency-adaptive differentiator, the frequency-fixed integrator and the frequency-fixed differentiator respectively. The effectiveness of the proposed methods and the correctness of the theoretical analysis are finally evaluated by experimental results.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123352999","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 : 2016-03-20DOI: 10.1109/APEC.2016.7467965
WeiZhong Ma, Xiaogao Xie, Yang Han, Hao Deng
Control scheme for TRIAC dimming high PF single-stage LED driver with adaptive bleeder circuit and nonlinear current reference is studied in this paper. The target of the control scheme is to achieve high efficiency and high compatibility to different kinds of TRIAC dimmers. The control scheme includes adaptive bleeder circuit control, operation modes control, non-linear current reference and output current estimation. The adaptive bleeder circuit regulates the bleeder current according to the phase angle to reduce the loss. The driver operates in boundary conduction model under large phase angle for achieving high efficiency and operates in discontinuous conduction mode with adaptive off-time control for frequency limitation. In order to achieve wide dimming angle, a non-linear current reference circuit is proposed. The output current estimation circuit is applied to estimate the output current so that the switch can be driven directly. Three topologies of TRIAC dimmable driver including floating buck, floating buck-boost and flyback with proposed control schemes are presented in this paper. Detailed theoretical analysis and optimal design considerations are presented. Finally, a 63V/135mA LED driver prototype based on floating buck-boost topology with the proposed control scheme was built up. High dimmer compatibility has been achieved.
{"title":"Control scheme for TRIAC dimming high PF single-stage LED driver with adaptive bleeder circuit and non-linear current reference","authors":"WeiZhong Ma, Xiaogao Xie, Yang Han, Hao Deng","doi":"10.1109/APEC.2016.7467965","DOIUrl":"https://doi.org/10.1109/APEC.2016.7467965","url":null,"abstract":"Control scheme for TRIAC dimming high PF single-stage LED driver with adaptive bleeder circuit and nonlinear current reference is studied in this paper. The target of the control scheme is to achieve high efficiency and high compatibility to different kinds of TRIAC dimmers. The control scheme includes adaptive bleeder circuit control, operation modes control, non-linear current reference and output current estimation. The adaptive bleeder circuit regulates the bleeder current according to the phase angle to reduce the loss. The driver operates in boundary conduction model under large phase angle for achieving high efficiency and operates in discontinuous conduction mode with adaptive off-time control for frequency limitation. In order to achieve wide dimming angle, a non-linear current reference circuit is proposed. The output current estimation circuit is applied to estimate the output current so that the switch can be driven directly. Three topologies of TRIAC dimmable driver including floating buck, floating buck-boost and flyback with proposed control schemes are presented in this paper. Detailed theoretical analysis and optimal design considerations are presented. Finally, a 63V/135mA LED driver prototype based on floating buck-boost topology with the proposed control scheme was built up. High dimmer compatibility has been achieved.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121386691","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 : 2016-03-20DOI: 10.1109/APEC.2016.7468182
Teng Liu, Zeng Liu, Jinjun Liu, Qingyun Dou
Grid-connected Voltage Source Inverter (VSI) with LCL filters, controlled by proportional-resonant compensator, is very popular in utility application for its better power quality feature, while it is prone to instability especially under weak grid condition. This paper deals with this issue utilizing the terminal impedances of the inverter and the grid. Firstly, the instability mechanism is revealed by modeling the inverter output impedance, and it is observed that the item, contributing to the instability, is a sudden peak in the magnitude of the inverter output admittance. Moreover, it is found that this peak is inevitable, and is introduced by a stable designed inverter with high current control loop bandwidth. Secondly, to dampen out this peak for mitigating the instability, a novel control method based on adding lag compensator directly into the current control loop is proposed without extra needs on the current and voltage sensors. Lastly, the effectiveness of the proposed instability mitigation scheme is verified both by the simulation and experimental results.
{"title":"Mechanism analysis and mitigation of instability in grid-connected Voltage Source Inverter with LCL filters based on terminal impedance","authors":"Teng Liu, Zeng Liu, Jinjun Liu, Qingyun Dou","doi":"10.1109/APEC.2016.7468182","DOIUrl":"https://doi.org/10.1109/APEC.2016.7468182","url":null,"abstract":"Grid-connected Voltage Source Inverter (VSI) with LCL filters, controlled by proportional-resonant compensator, is very popular in utility application for its better power quality feature, while it is prone to instability especially under weak grid condition. This paper deals with this issue utilizing the terminal impedances of the inverter and the grid. Firstly, the instability mechanism is revealed by modeling the inverter output impedance, and it is observed that the item, contributing to the instability, is a sudden peak in the magnitude of the inverter output admittance. Moreover, it is found that this peak is inevitable, and is introduced by a stable designed inverter with high current control loop bandwidth. Secondly, to dampen out this peak for mitigating the instability, a novel control method based on adding lag compensator directly into the current control loop is proposed without extra needs on the current and voltage sensors. Lastly, the effectiveness of the proposed instability mitigation scheme is verified both by the simulation and experimental results.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121390730","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 : 2016-03-20DOI: 10.1109/APEC.2016.7468132
J. Neely, J. Johnson, J. Delhotal, S. Gonzalez, M. Lave
Increasing the penetration of distributed renewable sources, including photovoltaic (PV) sources, poses technical challenges for grid management. The grid has been optimized over decades to rely upon large centralized power plants with well-established feedback controls, but now non-dispatchable, renewable sources are displacing these controllable generators. By programming autonomous functionality into distributed energy resources-in particular, PV inverters-the aggregated PV resources can act collectively to mitigate grid disturbances. This paper focuses on the problem of frequency regulation. Specifically, the use of existing IEC 61850-90-7 grid support functions to improve grid frequency response using a frequency-watt function was investigated. The proposed approach dampens frequency disturbances associated with variable irradiance conditions as well as contingency events without incorporating expensive energy storage systems or supplemental generation, but it does require some curtailment of power to enable headroom for control action. Thus, this study includes a determination of the trade-offs between reduced energy delivery and dynamic performance. This paper includes simulation results for an island grid and hardware results for a testbed that includes a load, a 225 kW diesel generator, and a 24 kW inverter.
{"title":"Evaluation of PV frequency-watt function for fast frequency reserves","authors":"J. Neely, J. Johnson, J. Delhotal, S. Gonzalez, M. Lave","doi":"10.1109/APEC.2016.7468132","DOIUrl":"https://doi.org/10.1109/APEC.2016.7468132","url":null,"abstract":"Increasing the penetration of distributed renewable sources, including photovoltaic (PV) sources, poses technical challenges for grid management. The grid has been optimized over decades to rely upon large centralized power plants with well-established feedback controls, but now non-dispatchable, renewable sources are displacing these controllable generators. By programming autonomous functionality into distributed energy resources-in particular, PV inverters-the aggregated PV resources can act collectively to mitigate grid disturbances. This paper focuses on the problem of frequency regulation. Specifically, the use of existing IEC 61850-90-7 grid support functions to improve grid frequency response using a frequency-watt function was investigated. The proposed approach dampens frequency disturbances associated with variable irradiance conditions as well as contingency events without incorporating expensive energy storage systems or supplemental generation, but it does require some curtailment of power to enable headroom for control action. Thus, this study includes a determination of the trade-offs between reduced energy delivery and dynamic performance. This paper includes simulation results for an island grid and hardware results for a testbed that includes a load, a 225 kW diesel generator, and a 24 kW inverter.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116374026","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 : 2016-03-20DOI: 10.1109/APEC.2016.7468275
T. Baier, B. Piepenbreier
This paper investigates the performance of a magnetically coupled T-Source-Inverter (TSI) for extra low voltage and high current applications. As the TSI is part of the well-known group of inverters with impedance source networks, it is capable to boost the output voltage beyond the level of the input voltage within a single stage. This boost operation is achieved by inserting a new operational state called `shoot through'. By using a proper turns ratio for the transformer design, the TSI can theoretically reach the same boost factor compared to inverters with impedance source networks without coupled inductors (e.g. Z-Source and Quasi-Z-Source) while operating with a smaller shoot through duty cycle. Considering the fact that it is not possible to build an ideal transformer, the coupling coefficient of the transformer respectively the leakage inductance determines its performance. For that reason, this paper focuses on a practical extra low voltage and high current application of the TSI and its limitations which are exposed in the section of the experimental results.
{"title":"Bidirectional magnetically coupled T-Source Inverter for extra low voltage application","authors":"T. Baier, B. Piepenbreier","doi":"10.1109/APEC.2016.7468275","DOIUrl":"https://doi.org/10.1109/APEC.2016.7468275","url":null,"abstract":"This paper investigates the performance of a magnetically coupled T-Source-Inverter (TSI) for extra low voltage and high current applications. As the TSI is part of the well-known group of inverters with impedance source networks, it is capable to boost the output voltage beyond the level of the input voltage within a single stage. This boost operation is achieved by inserting a new operational state called `shoot through'. By using a proper turns ratio for the transformer design, the TSI can theoretically reach the same boost factor compared to inverters with impedance source networks without coupled inductors (e.g. Z-Source and Quasi-Z-Source) while operating with a smaller shoot through duty cycle. Considering the fact that it is not possible to build an ideal transformer, the coupling coefficient of the transformer respectively the leakage inductance determines its performance. For that reason, this paper focuses on a practical extra low voltage and high current application of the TSI and its limitations which are exposed in the section of the experimental results.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126462615","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 : 2016-03-20DOI: 10.1109/APEC.2016.7467908
Chenhao Nan, R. Ayyanar
The 48V - 14V automotive power system is gaining acceptance - due to the increasing number and power rating of electrical and electronic components in vehicles to support advanced functionalities. Multiphase synchronous bi-directional buck/boost converter is currently employed for connecting two bus voltages. However, it has low efficiency at high frequency operation and high EMI noise due to its hard-switching. A zero-voltage transition bi-directional buck/boost converter with coupled inductor is proposed for this application, which provides ZVS for main switches and ZCS for auxiliary switches, and features wide ZVS range and low loss in auxiliary branch. The operating principles including ZVS/ZCS mechanism, details of circuit design, and experimental results from a 1 MHz and 250 W prototype are presented.
{"title":"A 1 MHz bi-directional soft-switching DC-DC converter with planar coupled inductor for dual voltage automotive systems","authors":"Chenhao Nan, R. Ayyanar","doi":"10.1109/APEC.2016.7467908","DOIUrl":"https://doi.org/10.1109/APEC.2016.7467908","url":null,"abstract":"The 48V - 14V automotive power system is gaining acceptance - due to the increasing number and power rating of electrical and electronic components in vehicles to support advanced functionalities. Multiphase synchronous bi-directional buck/boost converter is currently employed for connecting two bus voltages. However, it has low efficiency at high frequency operation and high EMI noise due to its hard-switching. A zero-voltage transition bi-directional buck/boost converter with coupled inductor is proposed for this application, which provides ZVS for main switches and ZCS for auxiliary switches, and features wide ZVS range and low loss in auxiliary branch. The operating principles including ZVS/ZCS mechanism, details of circuit design, and experimental results from a 1 MHz and 250 W prototype are presented.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126401516","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 : 2016-03-20DOI: 10.1109/APEC.2016.7468242
W. Choi, Woongkul Lee, B. Sarlioglu
Grid-connected inverters (GCIs) are power electronics interfaces to connect distributed energy resources into the grid. In order to improve the performance of distributed energy resources as well as maintain the high power quality of the grid, it is important to understand the characteristic of GCIs with appropriate controllers depending on its applications. This paper presents a study on the effect of grid inductance on quality of the grid current when there are multiple parallel-connected inverters to the grid. The model includes three-phase two-level voltage source inverters, output LCL filter, the grid, and voltage-oriented PI controller with a power controller. Parallel GCI systems are mathematically modeled. Frequency responses of grid current are investigated according to different grid inductances. A parallel grid-connected inverter system is simulated using MATLAB Simulink in order to present the effect of grid inductance on grid current and power quality.
{"title":"Effect of grid inductance on grid current quality of parallel grid-connected inverter system with output LCL filter and closed-loop control","authors":"W. Choi, Woongkul Lee, B. Sarlioglu","doi":"10.1109/APEC.2016.7468242","DOIUrl":"https://doi.org/10.1109/APEC.2016.7468242","url":null,"abstract":"Grid-connected inverters (GCIs) are power electronics interfaces to connect distributed energy resources into the grid. In order to improve the performance of distributed energy resources as well as maintain the high power quality of the grid, it is important to understand the characteristic of GCIs with appropriate controllers depending on its applications. This paper presents a study on the effect of grid inductance on quality of the grid current when there are multiple parallel-connected inverters to the grid. The model includes three-phase two-level voltage source inverters, output LCL filter, the grid, and voltage-oriented PI controller with a power controller. Parallel GCI systems are mathematically modeled. Frequency responses of grid current are investigated according to different grid inductances. A parallel grid-connected inverter system is simulated using MATLAB Simulink in order to present the effect of grid inductance on grid current and power quality.","PeriodicalId":143091,"journal":{"name":"2016 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126459958","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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