Pub Date : 2021-03-31DOI: 10.18618/REP.2021.1.0004
R. Reis, M. Kimpara, J. Pinto, B. Fahimi
– The switched reluctance motor (SRM) performance can be improved by either drive control and/or machine design. However, the drive control may be more complex and expensive depending on the SRM design, whereas a favorable SRM design may result in simpler and cheaper drive control system. In order to evaluate the SRM performance before designing the control/drive system, it is important carrying out a multiphysics simulation of the machine, in such way that if electromagnetics, structural and thermal performance do not cope with the requirements for simpler control/drive system, the SRM can be redesigned until reach a feasible goal. This paper presents a comprehensive simulation analysis of a 6/4 three-phase SRM using the finite element method as evaluation approach for future use in optimization design techniques. First, the main geometrical parameters of the motor were calculated and then static and dynamic simulations were conducted to analyze the motor electromagnetic performance. Afterwards, the natural frequencies and vibration modes were found through modal analysis. Finally, the thermal analysis was accomplished to investigate the internal temperature rise due to the copper losses. The analysis has been performed in ANSYS package, providing an insightful guidance for the near optimum motor designing stage.
{"title":"MULTI-PHYSICS SIMULATION OF 6/4 SWITCHED RELUCTANCE MOTOR BY FINITE ELEMENT METHOD","authors":"R. Reis, M. Kimpara, J. Pinto, B. Fahimi","doi":"10.18618/REP.2021.1.0004","DOIUrl":"https://doi.org/10.18618/REP.2021.1.0004","url":null,"abstract":"– The switched reluctance motor (SRM) performance can be improved by either drive control and/or machine design. However, the drive control may be more complex and expensive depending on the SRM design, whereas a favorable SRM design may result in simpler and cheaper drive control system. In order to evaluate the SRM performance before designing the control/drive system, it is important carrying out a multiphysics simulation of the machine, in such way that if electromagnetics, structural and thermal performance do not cope with the requirements for simpler control/drive system, the SRM can be redesigned until reach a feasible goal. This paper presents a comprehensive simulation analysis of a 6/4 three-phase SRM using the finite element method as evaluation approach for future use in optimization design techniques. First, the main geometrical parameters of the motor were calculated and then static and dynamic simulations were conducted to analyze the motor electromagnetic performance. Afterwards, the natural frequencies and vibration modes were found through modal analysis. Finally, the thermal analysis was accomplished to investigate the internal temperature rise due to the copper losses. The analysis has been performed in ANSYS package, providing an insightful guidance for the near optimum motor designing stage. ","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"193 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114049868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-31DOI: 10.18618/REP.2021.1.0053
P. Evald, G. Hollweg, R. Tambara, H. Grundling
– In this work, it is presented a new direct discrete-time robust adaptive PI (Proportional Integral) Controller for grid-injected current control loop of a voltage source converter with LCL filter. The mathematical background is based on Robust Model Reference Adaptive Control theory. However, the proposed controller is straightforward, it does not need a reference model and has capability to track directly currents reference. This approach simplifies significantly controller design, resulting in a reformulation of parameters vector used for adaptation of adjustable gains. It turns the controller robust to unmodelled dynamics, while avoid the complexity inherent to the conventional high order adaptive controllers for grid-connected power systems. Besides, it is highlighted that proposed controller does not need resonant controllers for grid disturbance rejection, or require any knowledge of grid parameters, lines impedance or load power demand. Also, due to its simple structure, it is easily implemented and does not require a high processing capacity. Furthermore, the effectiveness of the control strategy in terms of reference tracking, harmonics content and robustness to the grid impedance variation is corroborated through experiments.
{"title":"A DISCRETE-TIME ROBUST ADAPTIVE PI CONTROLLER FOR GRID-CONNECTED VOLTAGE SOURCE CONVERTER WITH LCL FILTER","authors":"P. Evald, G. Hollweg, R. Tambara, H. Grundling","doi":"10.18618/REP.2021.1.0053","DOIUrl":"https://doi.org/10.18618/REP.2021.1.0053","url":null,"abstract":"– In this work, it is presented a new direct discrete-time robust adaptive PI (Proportional Integral) Controller for grid-injected current control loop of a voltage source converter with LCL filter. The mathematical background is based on Robust Model Reference Adaptive Control theory. However, the proposed controller is straightforward, it does not need a reference model and has capability to track directly currents reference. This approach simplifies significantly controller design, resulting in a reformulation of parameters vector used for adaptation of adjustable gains. It turns the controller robust to unmodelled dynamics, while avoid the complexity inherent to the conventional high order adaptive controllers for grid-connected power systems. Besides, it is highlighted that proposed controller does not need resonant controllers for grid disturbance rejection, or require any knowledge of grid parameters, lines impedance or load power demand. Also, due to its simple structure, it is easily implemented and does not require a high processing capacity. Furthermore, the effectiveness of the control strategy in terms of reference tracking, harmonics content and robustness to the grid impedance variation is corroborated through experiments.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130041649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-31DOI: 10.18618/REP.2021.1.0057
Ezequiel Junior de Lima, Luiz Carlos De Freitas
– The concept of hosting capacity (HC) is becoming more widespread, as it is a comprehensive approach that allows understanding the impacts of distributed energy resources into the distribution system. Several methods for calculating HC have been developed in recent years and are classified into deterministic, stochastic and time series, each with its respective pros and cons. Within this context, in this paper the authors present a hybrid methodology that combines deterministic and time series methods to find a real feeder hosting capacity, located in “Poços de Caldas” city, Brazil, from the utility company “DMED”. This feeder was modeled and analyzed taking into account variations in loads and power injection by DER’s on the system’s buses. Finally, the results achieved demonstrate the effectiveness of the proposed methodology
-托管容量(HC)的概念正变得越来越普遍，因为它是一种全面的方法，可以理解分布式能源对配电系统的影响。近年来发展了几种计算HC的方法，分为确定性、随机和时间序列，每种方法都有各自的优点和缺点。在此背景下，作者提出了一种混合方法，结合了确定性和时间序列方法来寻找位于巴西“poos de Caldas”市的真正馈线承载能力，来自公用事业公司“DMED”。考虑到系统母线上DER的负载变化和功率注入，对馈线进行了建模和分析。最后，仿真结果验证了所提方法的有效性
{"title":"PROPOSAL OF A HYBRID METHODOLOGY FOR HOSTING CAPACITY ANALYSIS","authors":"Ezequiel Junior de Lima, Luiz Carlos De Freitas","doi":"10.18618/REP.2021.1.0057","DOIUrl":"https://doi.org/10.18618/REP.2021.1.0057","url":null,"abstract":"– The concept of hosting capacity (HC) is becoming more widespread, as it is a comprehensive approach that allows understanding the impacts of distributed energy resources into the distribution system. Several methods for calculating HC have been developed in recent years and are classified into deterministic, stochastic and time series, each with its respective pros and cons. Within this context, in this paper the authors present a hybrid methodology that combines deterministic and time series methods to find a real feeder hosting capacity, located in “Poços de Caldas” city, Brazil, from the utility company “DMED”. This feeder was modeled and analyzed taking into account variations in loads and power injection by DER’s on the system’s buses. Finally, the results achieved demonstrate the effectiveness of the proposed methodology","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116969206","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 : 2020-12-31DOI: 10.18618/rep.2020.4.0028
Allan Diego Maffezzolli, Rubens Tadeu Hock Júnior, A. Batschauer
{"title":"CURRENT LIMITATION OF A VOLTAGE-CONTROLLED VOLTAGE REGULATOR","authors":"Allan Diego Maffezzolli, Rubens Tadeu Hock Júnior, A. Batschauer","doi":"10.18618/rep.2020.4.0028","DOIUrl":"https://doi.org/10.18618/rep.2020.4.0028","url":null,"abstract":"","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128926340","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 : 2020-12-17DOI: 10.18618/rep.2020.4.00701
Don Tan
This paper attempts to summarize 10 major contemporary challenges for power electronics and system technology (PEAS technology). Historical background is first reviewed together with most recent technological advances. Recent advances are then discussed in detail. A recent breakthrough in megawatt system design and design verification is highlighted. We then articulate the challenges that PEAS technology is facing contemporarily. They are: Powering smart buildings, smart factories, and smart infrastructure, Renewable energy integration and structured microgrids, EV drives and vehicle power systems, Ultra-fast and ultra-efficient chargers, Appliances “White goods,” Server and data center power systems’ Wireless power transfer, Powering IoT and wireless sensor networks, Storage and “power dump,” and ATGC (All things grid connected), system integration, and dynamic control. These 10 areas present technical barriers for us to overcome and anticipated progress will help define the future of power electronics and its impact to the power and energy industry at large.
{"title":"POWER ELECTRONICS: HISTORICAL NOTES, RECENT ADVANCES AND CONTEMPORARY CHALLENGES","authors":"Don Tan","doi":"10.18618/rep.2020.4.00701","DOIUrl":"https://doi.org/10.18618/rep.2020.4.00701","url":null,"abstract":"This paper attempts to summarize 10 major contemporary challenges for power electronics and system technology (PEAS technology). Historical background is first reviewed together with most recent technological advances. Recent advances are then discussed in detail. A recent breakthrough in megawatt system design and design verification is highlighted. We then articulate the challenges that PEAS technology is facing contemporarily. They are: Powering smart buildings, smart factories, and smart infrastructure, Renewable energy integration and structured microgrids, EV drives and vehicle power systems, Ultra-fast and ultra-efficient chargers, Appliances “White goods,” Server and data center power systems’ Wireless power transfer, Powering IoT and wireless sensor networks, Storage and “power dump,” and ATGC (All things grid connected), system integration, and dynamic control. These 10 areas present technical barriers for us to overcome and anticipated progress will help define the future of power electronics and its impact to the power and energy industry at large.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127869716","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 : 2020-12-15DOI: 10.18618/rep.2020.4.0021
Yury Pontes, C. A. Silva, E. Junior
– Photovoltaic (PV) systems used in DC Nanogrids present prominent advantages associated with low maintenance need and operation costs. Owing to the low output voltage of the PV module, highly efficient high-voltage gain DC-DC converters are required for connection with the DC nanogrid. This work presents a novel DC-DC converter topology with current source characteristic for PV applications and current injection in DC nanogrids. The introduced converter uses coupled inductors and switched capacitors to achieve high voltage gain with low component count and without using extreme duty ratios. Besides, the main switch is turned on with nearly zero current, thus contributing to minimized switching losses. The qualitative and quantitative analyzes of the circuit are presented in detail and a prototype rated at 200 W is developed and evaluated in the laboratory. Experimental results demonstrate efficient renewable energy conversion, where the maximum efficiency is 96.8%.
{"title":"HIGH-VOLTAGE GAIN DC-DC CONVERTER FOR PHOTOVOLTAIC APPLICATIONS IN DC NANOGRIDS","authors":"Yury Pontes, C. A. Silva, E. Junior","doi":"10.18618/rep.2020.4.0021","DOIUrl":"https://doi.org/10.18618/rep.2020.4.0021","url":null,"abstract":"– Photovoltaic (PV) systems used in DC Nanogrids present prominent advantages associated with low maintenance need and operation costs. Owing to the low output voltage of the PV module, highly efficient high-voltage gain DC-DC converters are required for connection with the DC nanogrid. This work presents a novel DC-DC converter topology with current source characteristic for PV applications and current injection in DC nanogrids. The introduced converter uses coupled inductors and switched capacitors to achieve high voltage gain with low component count and without using extreme duty ratios. Besides, the main switch is turned on with nearly zero current, thus contributing to minimized switching losses. The qualitative and quantitative analyzes of the circuit are presented in detail and a prototype rated at 200 W is developed and evaluated in the laboratory. Experimental results demonstrate efficient renewable energy conversion, where the maximum efficiency is 96.8%.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115603817","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 : 2020-10-23DOI: 10.18618/rep.2020.4.0029
D. Mendonça, A. F. Cupertino, H. Pereira, S. Junior, R. Teodorescu
The cascaded H-bridge (CHB) is a popular topology for Static Synchronous Compensator (STATCOM) applications. Since this converter is composed of tens/hundreds of components, concerns related to reliability are inherent in the design of this converter. Generally, redundant cells are used, increasing “Manuscript received 05/05/2020; first revision 08/04/2020; accepted for publication 09/14/2020, by recommendation of Editor Demercil de Souza Oliveira Jr. http://dx.doi.org/10.18618/REP.2020.4.0029” the cost of STATCOM. Indeed, there is a potential for fault-tolerant operation when the overmodulation region is considered. This work explores the inherent redundancy of the delta-CHB in the overmodulation region. Initially, an analytical expression for the boundary between the linear region and overmodulation is determined and validated for different operating conditions. Then, the fault-tolerant is evaluated in a simulation environment, considering a case study of a 17 MVA/13.8 kV delta-CHB STATCOM composed of 24 cells per arm. Symmetric and asymmetric failures are addressed. The results indicate that the converter is capable of operating at rated conditions after 4 faults distributed in the three converter arms (5.5 % redundancy factor) without exceeding the recommended harmonic distortion values.
级联h桥(CHB)是静态同步补偿器(STATCOM)应用中常用的拓扑结构。由于该转换器由数十/数百个组件组成，因此与可靠性相关的问题是该转换器设计中固有的。一般使用冗余单元格，增加“Manuscript received 05/05/2020;第一版08/04/2020;根据编辑Demercil de Souza Oliveira Jr.的建议，接受于2020年9月14日出版http://dx.doi.org/10.18618/REP.2020.4.0029“STATCOM的成本。实际上，当考虑过调制区域时，存在容错操作的可能性。这项工作探讨了delta-CHB在过调制区域的固有冗余。首先，确定了线性区域和过调制之间边界的解析表达式，并在不同的工作条件下进行了验证。然后，以17 MVA/13.8 kV delta-CHB STATCOM为例，在模拟环境中对其容错性进行了评估。对称和非对称故障处理。结果表明，在不超过推荐谐波失真值的情况下，分布在三个变换器臂上的4个故障(冗余系数5.5%)能够在额定条件下运行。
{"title":"FAULT-TOLERANT STRATEGY FOR A DELTA-CHB-BASED STATCOM IN THE OVERMODULATION REGION","authors":"D. Mendonça, A. F. Cupertino, H. Pereira, S. Junior, R. Teodorescu","doi":"10.18618/rep.2020.4.0029","DOIUrl":"https://doi.org/10.18618/rep.2020.4.0029","url":null,"abstract":"The cascaded H-bridge (CHB) is a popular topology for Static Synchronous Compensator (STATCOM) applications. Since this converter is composed of tens/hundreds of components, concerns related to reliability are inherent in the design of this converter. Generally, redundant cells are used, increasing “Manuscript received 05/05/2020; first revision 08/04/2020; accepted for publication 09/14/2020, by recommendation of Editor Demercil de Souza Oliveira Jr. http://dx.doi.org/10.18618/REP.2020.4.0029” the cost of STATCOM. Indeed, there is a potential for fault-tolerant operation when the overmodulation region is considered. This work explores the inherent redundancy of the delta-CHB in the overmodulation region. Initially, an analytical expression for the boundary between the linear region and overmodulation is determined and validated for different operating conditions. Then, the fault-tolerant is evaluated in a simulation environment, considering a case study of a 17 MVA/13.8 kV delta-CHB STATCOM composed of 24 cells per arm. Symmetric and asymmetric failures are addressed. The results indicate that the converter is capable of operating at rated conditions after 4 faults distributed in the three converter arms (5.5 % redundancy factor) without exceeding the recommended harmonic distortion values.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"278 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124214846","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 : 2020-10-23DOI: 10.18618/rep.2020.4.0030
Leonardo A. Rodrigues, D. B. Chaves, F. Grigoletto
The nine-switch (9S) topology is an interesting alternative to the traditional three-phase backto-back converter because it allows the reduction of active semiconductors count. On the other hand, some applications have input dc voltages lower than that minimum required for the synthesis of ac voltages and an additional dc-dc stage is required. Furthermore, the Split-Source Inverter (SSI) aggregates the boost and inversion stage in a single power processing unit, eliminating multiple converters. This paper proposes the Nine-Switch Split-Source Inverter (9S-SSI) that joins the characteristisc of dual three-phase power ports with the dc voltage boost stage. In addition, a PWM strategy is proposed where the SV and scalar approaches are presented. Both approaches are correlated, however the first one allows the direct choice of switching vectors while Manuscript received 05/13/2020; first revision 09/13/2020; accepted for publication 10/15/2020, by recommendation of Editor Demercil de Souza Oliveira Jr. http://dx.doi.org/10.18618/REP.2020.4.0030 the second has the advantage of ease of implementation. Futhermore, the loss analysis and the dimentioning of power devices are presented. Simulation and experimental results are presented to demonstrate the good performance of the proposed topology and modulation strategy.
九开关(9S)拓扑结构是传统三相背靠背转换器的有趣替代方案，因为它允许减少有源半导体计数。另一方面，一些应用的输入直流电压低于合成交流电压所需的最低电压，并且需要额外的dc-dc级。此外，分源逆变器(SSI)将升压和反转级聚合在单个功率处理单元中，从而消除了多个转换器。本文提出了一种结合双三相电源端口特性和直流升压级的九开关分源逆变器(9S-SSI)。此外，还提出了一种基于SV和标量方法的PWM策略。两种方法都是相关的，但第一种方法允许直接选择切换向量，而稿件收到日期为2020年5月13日;第一版09/13/2020;经编辑Demercil de Souza Oliveira Jr.建议，接受于2020年10月15日出版http://dx.doi.org/10.18618/REP.2020.4.0030第二种方法具有易于实施的优点。此外，还对功率器件的损耗进行了分析和优化。仿真和实验结果证明了所提出的拓扑和调制策略的良好性能。
{"title":"Analysis and Modulation of Nine-Switch Split Source Inverter (9S-SSI)","authors":"Leonardo A. Rodrigues, D. B. Chaves, F. Grigoletto","doi":"10.18618/rep.2020.4.0030","DOIUrl":"https://doi.org/10.18618/rep.2020.4.0030","url":null,"abstract":"The nine-switch (9S) topology is an interesting alternative to the traditional three-phase backto-back converter because it allows the reduction of active semiconductors count. On the other hand, some applications have input dc voltages lower than that minimum required for the synthesis of ac voltages and an additional dc-dc stage is required. Furthermore, the Split-Source Inverter (SSI) aggregates the boost and inversion stage in a single power processing unit, eliminating multiple converters. This paper proposes the Nine-Switch Split-Source Inverter (9S-SSI) that joins the characteristisc of dual three-phase power ports with the dc voltage boost stage. In addition, a PWM strategy is proposed where the SV and scalar approaches are presented. Both approaches are correlated, however the first one allows the direct choice of switching vectors while Manuscript received 05/13/2020; first revision 09/13/2020; accepted for publication 10/15/2020, by recommendation of Editor Demercil de Souza Oliveira Jr. http://dx.doi.org/10.18618/REP.2020.4.0030 the second has the advantage of ease of implementation. Futhermore, the loss analysis and the dimentioning of power devices are presented. Simulation and experimental results are presented to demonstrate the good performance of the proposed topology and modulation strategy.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"232 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114422447","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 : 2020-09-30DOI: 10.18618/rep.2020.3.0013
Pierry M. Reinaldo, B. S. Dupczak, E. A. C. Neto
The presence of distributed generation (DG) in low-voltage networks is increasing, aiming at the use of photovoltaic solar energy. In the current model of energy compensation, only the injection of active power is foreseen. There is no commitment from the generating units to contribute to the voltage system regulation. For utilities, it is necessary to research the consequences caused by DG growth in the technical losses and consumers power quality. In this context, this work presents a study on the impacts caused by distributed photovoltaic generation in Celesc’s low-voltage network. Four feeders are evaluated, with different load profiles, using the OpenDSS simulation software. The results show profile changes in the technical losses and feeders voltages, depending on the DG power in the networks.
{"title":"Impact Assessment of Photovoltaic Distributed Generation on Celesc Low-Voltage Network","authors":"Pierry M. Reinaldo, B. S. Dupczak, E. A. C. Neto","doi":"10.18618/rep.2020.3.0013","DOIUrl":"https://doi.org/10.18618/rep.2020.3.0013","url":null,"abstract":"The presence of distributed generation (DG) in low-voltage networks is increasing, aiming at the use of photovoltaic solar energy. In the current model of energy compensation, only the injection of active power is foreseen. There is no commitment from the generating units to contribute to the voltage system regulation. For utilities, it is necessary to research the consequences caused by DG growth in the technical losses and consumers power quality. In this context, this work presents a study on the impacts caused by distributed photovoltaic generation in Celesc’s low-voltage network. Four feeders are evaluated, with different load profiles, using the OpenDSS simulation software. The results show profile changes in the technical losses and feeders voltages, depending on the DG power in the networks.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130897110","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 : 2020-09-07DOI: 10.18618/rep.2020.3.0025
K. Martin, O. Araújo, S. A. Bonaldo, M. F. D. Silva
This work presents the design and development of a lighting system based on light emitting diodes (LEDs) capable of accurately reproducing light spectra for applications that require a specific light spectrum. The proposed methodology uses Mathematical Programming, using a Mixed Integer Linear Programming model, to obtain the optimal combination of LED models that result in the spectrum as close as possible to the reference. The LEDs of each model selected by the optimization procedure are driven by an electronic Manuscript received 04/23/2020; first revision 07/31/2020; accepted for publication 09/01/2020, by recommendation of Editor Demercil de Souza Oliveira Jr. http://dx.doi.org/10.18618/REP.2020.3.0025 system composed of Buck converters with current control by hysteresis and control of light intensity by Pulse Width Modulation. The independent control of each LED model allows the possibility to vary the intensity and the spectral distribution of the light, adding flexibility to the lighting system. As a practical application, a system is developed to reproduce the spectrum of sunlight for different times of the day. Tests to validate the proposed methodology demonstrated that it is possible to reproduce certain spectra with fidelity, with an average relative error of 12% between the designed spectrum and the reference spectrum, considering the LED models available.
这项工作提出了一种基于发光二极管(led)的照明系统的设计和开发，该系统能够准确地再现需要特定光谱的应用的光谱。所提出的方法使用数学规划，使用混合整数线性规划模型，以获得LED模型的最佳组合，从而使光谱尽可能接近参考。通过优化程序选择的每个型号的led由04/23/2020收到的电子稿件驱动;第一版:2020年7月31日;通过编辑Demercil de Souza Oliveira Jr.的推荐，接受于2020年9月1日发表http://dx.doi.org/10.18618/REP.2020.3.0025系统由Buck转换器组成，通过磁滞控制电流，通过脉冲宽度调制控制光强。每个LED模型的独立控制允许改变光的强度和光谱分布的可能性，增加了照明系统的灵活性。作为一个实际应用，我们开发了一个系统来重现一天中不同时间的阳光光谱。验证所提出方法的测试表明，考虑到可用的LED模型，可以以保真度再现某些光谱，设计光谱与参考光谱之间的平均相对误差为12%。
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