Pub Date : 2020-03-19DOI: 10.18618/REP.2020.1.0051
F. V. Rocha, N. Rocha, V. B. Melo, E. R. C. Silva, C. Jacobina
– This paper presents a three-phase to single-phase six-leg converter for a wind energy conversion system based on Doubly-Fed Induction Generator (DFIG). The converter is composed of six legs and is divided in three parts: the grid-side converter (GSC), which is responsible for power factor and DC-link voltage controls, the stator-side converter (SSC), which guarantees the control of the stator voltage, and the rotor-side converter (RSC), which is responsible for vector control of the generator. One of the converter’s legs is shared by grid-side and stator-side converters. The main advantages of the proposed configuration compared to other topologies presented in the literature are providing balanced three-phase voltages to the DFIG, simple control system and not having any limitation with respect to synchronization between grid and stator voltages and DC-link voltage. The system model, pulse-width modulation (PWM) and control strategies are discussed and simulation and experimental results are presented in order to prove the feasibility of the system.
{"title":"THREE-PHASE TO SINGLE-PHASE GENERATION SYSTEM BASED ON DOUBLY-FED INDUCTION GENERATOR","authors":"F. V. Rocha, N. Rocha, V. B. Melo, E. R. C. Silva, C. Jacobina","doi":"10.18618/REP.2020.1.0051","DOIUrl":"https://doi.org/10.18618/REP.2020.1.0051","url":null,"abstract":"– This paper presents a three-phase to single-phase six-leg converter for a wind energy conversion system based on Doubly-Fed Induction Generator (DFIG). The converter is composed of six legs and is divided in three parts: the grid-side converter (GSC), which is responsible for power factor and DC-link voltage controls, the stator-side converter (SSC), which guarantees the control of the stator voltage, and the rotor-side converter (RSC), which is responsible for vector control of the generator. One of the converter’s legs is shared by grid-side and stator-side converters. The main advantages of the proposed configuration compared to other topologies presented in the literature are providing balanced three-phase voltages to the DFIG, simple control system and not having any limitation with respect to synchronization between grid and stator voltages and DC-link voltage. The system model, pulse-width modulation (PWM) and control strategies are discussed and simulation and experimental results are presented in order to prove the feasibility of the system.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126007764","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 : 2020-03-19DOI: 10.18618/rep.2020.1.0064
W. A. Venturini, J. Lenz, Henrique Jank, J. R. Pinheiro, L. Lopes, F. Bisogno
Resumo – Este trabalho propõe uma topologia de UPS de dupla conversão para a integração com painéis fotovoltaicos que permite o rastreamento do ponto de máxima potência sem a adição do usual conversor CC-CC para interface entre painéis e barramento CC. Os painéis são conectados diretamente ao barramento CC, e o MPPT é realizado pelo circuito de entrada. Através deste sistema, é possível alimentar cargas com uma tensão de saída regulada, independentemente dos distúrbios da tensão da rede pública, enquanto gerando energia fotovoltaica. Em caso de energia excedente, pode-se injetar corrente na rede, vez que o circuito de entrada possui característica bidirecional. O desempenho do sistema é validado através de resultados Hardware-in-the-Loop , os quais demonstram a funcionalidade da topologia proposta. Abstract – This work proposes a double-conversion UPS topology for the integration with photovoltaic panels that allows the maximum power point tracking without the addition of the usual DC-DC converter for interface between panels and DC-link. The panel arrangement is connected directly to the DC-link, and the MPPT is performed by the input circuit. Through this system it is possible to feed loads with a regulated output voltage regardless of mains voltage disturbances while generating PV energy. In case of power excess, current can be injected into the mains since the input circuit has a bidirectional characteristic. The system performance is validated through Hardware-in-the-Loop results, which demonstrate the functionality of the proposed topology.
{"title":"BIDIRECTIONAL DOUBLE-CONVERSION UNINTERRUPTIBLE POWER SUPPLY FOR INTEGRATION OF PHOTOVOLTAIC PANELS AND MPPT","authors":"W. A. Venturini, J. Lenz, Henrique Jank, J. R. Pinheiro, L. Lopes, F. Bisogno","doi":"10.18618/rep.2020.1.0064","DOIUrl":"https://doi.org/10.18618/rep.2020.1.0064","url":null,"abstract":"Resumo – Este trabalho propõe uma topologia de UPS de dupla conversão para a integração com painéis fotovoltaicos que permite o rastreamento do ponto de máxima potência sem a adição do usual conversor CC-CC para interface entre painéis e barramento CC. Os painéis são conectados diretamente ao barramento CC, e o MPPT é realizado pelo circuito de entrada. Através deste sistema, é possível alimentar cargas com uma tensão de saída regulada, independentemente dos distúrbios da tensão da rede pública, enquanto gerando energia fotovoltaica. Em caso de energia excedente, pode-se injetar corrente na rede, vez que o circuito de entrada possui característica bidirecional. O desempenho do sistema é validado através de resultados Hardware-in-the-Loop , os quais demonstram a funcionalidade da topologia proposta. Abstract – This work proposes a double-conversion UPS topology for the integration with photovoltaic panels that allows the maximum power point tracking without the addition of the usual DC-DC converter for interface between panels and DC-link. The panel arrangement is connected directly to the DC-link, and the MPPT is performed by the input circuit. Through this system it is possible to feed loads with a regulated output voltage regardless of mains voltage disturbances while generating PV energy. In case of power excess, current can be injected into the mains since the input circuit has a bidirectional characteristic. The system performance is validated through Hardware-in-the-Loop results, which demonstrate the functionality of the proposed topology.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127738611","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 : 2020-02-07DOI: 10.18618/rep.2020.1.0058
R. R. D. Lima, F. C. Melo, L. Freitas, G. B. Lima, D. Rodrigues, L. P. Pires
– This paper brings the design and development of a transformerless single-stage multistring photovoltaic current-source inverter (CSI), aiming exclusively the grid-tied operation. Due to the behavior as CSI, within the contributions of the present work there is the expansion of the literature of this type of topology through the implementation of control techniques and power operation usual in other topological structures. In addition, the proposed system was simulated in PSIM® and the computational and experimental results obtained showed a satisfactory behavior of the structure in favor of the injection of current in the grid with low harmonic distortion and high power factor, meeting national and international standards.
{"title":"Design and Development of a Grid-tied Transformerless Single-stage Multistring Photovoltaic CSI Inverter","authors":"R. R. D. Lima, F. C. Melo, L. Freitas, G. B. Lima, D. Rodrigues, L. P. Pires","doi":"10.18618/rep.2020.1.0058","DOIUrl":"https://doi.org/10.18618/rep.2020.1.0058","url":null,"abstract":"– This paper brings the design and development of a transformerless single-stage multistring photovoltaic current-source inverter (CSI), aiming exclusively the grid-tied operation. Due to the behavior as CSI, within the contributions of the present work there is the expansion of the literature of this type of topology through the implementation of control techniques and power operation usual in other topological structures. In addition, the proposed system was simulated in PSIM® and the computational and experimental results obtained showed a satisfactory behavior of the structure in favor of the injection of current in the grid with low harmonic distortion and high power factor, meeting national and international standards.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126531488","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 : 2020-02-06DOI: 10.18618/rep.2020.1.0003
F. Martinz, R. Destro, N. Ama, Kelly C. M. Carvalho, W. Komatsu, Lourenco Matakas Junior
Phase Locked Loops (PLLs) with in-loop Moving Average Filter (MAF) and a Proportional Integral (PI) controller are effective methods to achieve synchronization in grid-connected converters, since they have simple implementation, low computational burden and excellent filtering capability. However, they are known to be slow. The reasons are the MAF time delay and the PI controller tuning method, which makes the design of a fast control loop challenging. This paper demonstrates that the second-order Padé approximation is enough to achieve an accurate model for the MAF, and presents a controller design technique that results in the minimum settling times achievable for a MAF-PLL with a PI controller. Simulation and experimental results validate the proposed approach.
{"title":"MODELING AND DESIGN OF A FAST-DYNAMIC RESPONSE PHASE-LOCKED LOOP BASED ON MOVING AVERAGE FILTER","authors":"F. Martinz, R. Destro, N. Ama, Kelly C. M. Carvalho, W. Komatsu, Lourenco Matakas Junior","doi":"10.18618/rep.2020.1.0003","DOIUrl":"https://doi.org/10.18618/rep.2020.1.0003","url":null,"abstract":"Phase Locked Loops (PLLs) with in-loop Moving Average Filter (MAF) and a Proportional Integral (PI) controller are effective methods to achieve synchronization in grid-connected converters, since they have simple implementation, low computational burden and excellent filtering capability. However, they are known to be slow. The reasons are the MAF time delay and the PI controller tuning method, which makes the design of a fast control loop challenging. This paper demonstrates that the second-order Padé approximation is enough to achieve an accurate model for the MAF, and presents a controller design technique that results in the minimum settling times achievable for a MAF-PLL with a PI controller. Simulation and experimental results validate the proposed approach. ","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115753163","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 : 2020-02-05DOI: 10.18618/rep.2020.1.0045
Diego Teruo Mendes de Souza, Bruno Valverde, J. Pomilio
– Transformers with high-voltage operation may have undesired behavior due to the effects of their parasitic elements. In power electronics applications, if the primary voltage has harmonics, transformer resonances may be excited, causing high primary currents and secondary voltage stress, compromising the device isolation. This behavior is quite dangerous if the transformer operates without load, what means, without damping, because in this situation, the secondary voltage peak can reach more than two times the expected (rated) value. To protect the high frequency high voltage transformer against this dangerous operation, the overvoltage problem in open load condition is carefully explored and explained in this paper, with the proposition of different protection strategies to mitigate its effect, depending on the transformer parasitic elements values. The different strategies are analytically explained and validated by experimental results, showing their criteria design and effectiveness for the protection of high frequency high voltage transformers through the analysis of a 1 kVA, 311V, 20 kHz, 42/512 ferrite core transformer, showing its dynamics working alone and with each protection strategy.
{"title":"OVERVOLTAGE PROTECTION FOR HIGH FREQUENCY HIGH VOLTAGE POWER TRANSFORMERS","authors":"Diego Teruo Mendes de Souza, Bruno Valverde, J. Pomilio","doi":"10.18618/rep.2020.1.0045","DOIUrl":"https://doi.org/10.18618/rep.2020.1.0045","url":null,"abstract":"– Transformers with high-voltage operation may have undesired behavior due to the effects of their parasitic elements. In power electronics applications, if the primary voltage has harmonics, transformer resonances may be excited, causing high primary currents and secondary voltage stress, compromising the device isolation. This behavior is quite dangerous if the transformer operates without load, what means, without damping, because in this situation, the secondary voltage peak can reach more than two times the expected (rated) value. To protect the high frequency high voltage transformer against this dangerous operation, the overvoltage problem in open load condition is carefully explored and explained in this paper, with the proposition of different protection strategies to mitigate its effect, depending on the transformer parasitic elements values. The different strategies are analytically explained and validated by experimental results, showing their criteria design and effectiveness for the protection of high frequency high voltage transformers through the analysis of a 1 kVA, 311V, 20 kHz, 42/512 ferrite core transformer, showing its dynamics working alone and with each protection strategy.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116140793","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 : 2019-12-30DOI: 10.18618/rep.2019.4.0031
M. D. Vecchia, J. M. Andrade, Neilor C. Dal Pont, A. Kirsten, T. Lazzarin
This paper introduces a new family of nonisolated dc-dc converters that are generated by the integration of the active switched-capacitor (ASCC) and the conventional commutation cell (CCC). Based on the commutation cell concept, the new conceived hybrid active commutation cell (HACC) provides three different types of hybrid converters: buck, boost and buck-boost. All three converters are investigated in this study through the following approaches: topological stages, static gain analysis considering the switched capacitor features, generalization of the HACC and gain for M cells and steady-state analysis. The buck version presents a high conversion rate, which demonstrates that it has potential for step-down applications. To verify the proposed topologies, a prototype was built with the following specifications: 600 V input voltage, 150 V output voltage, 70 kHz switching frequency and 1 kW rated power. Efficiency close to 95% was obtained at 1 kW for the buck topology, which demonstrates that the proposed HACC can provide gain and high efficiency at the same time.
{"title":"Proposal, Analysis and Experimental Verification of Nonisolated DC-DC Converters Conceived from an Active Switched-Capacitor Commutation Cell","authors":"M. D. Vecchia, J. M. Andrade, Neilor C. Dal Pont, A. Kirsten, T. Lazzarin","doi":"10.18618/rep.2019.4.0031","DOIUrl":"https://doi.org/10.18618/rep.2019.4.0031","url":null,"abstract":"This paper introduces a new family of nonisolated dc-dc converters that are generated by the integration of the active switched-capacitor (ASCC) and the conventional commutation cell (CCC). Based on the commutation cell concept, the new conceived hybrid active commutation cell (HACC) provides three different types of hybrid converters: buck, boost and buck-boost. All three converters are investigated in this study through the following approaches: topological stages, static gain analysis considering the switched capacitor features, generalization of the HACC and gain for M cells and steady-state analysis. The buck version presents a high conversion rate, which demonstrates that it has potential for step-down applications. To verify the proposed topologies, a prototype was built with the following specifications: 600 V input voltage, 150 V output voltage, 70 kHz switching frequency and 1 kW rated power. Efficiency close to 95% was obtained at 1 kW for the buck topology, which demonstrates that the proposed HACC can provide gain and high efficiency at the same time.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"362 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133364105","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 : 2019-12-30DOI: 10.18618/rep.2019.4.0042
Carolina Knaesel, L. Michels, A. Batschauer, M. Mezaroba
Significant cost reduction of photovoltaic system components has changed the perspective of future application of these systems. Many installation sites currently discarded due to non-optimal orientations and partial shading conditions may become economically viable. Moreover, there is a tendency for the dissemination of building integrated photovoltaic systems (BIPV). An interesting approach to maximizing the power conversion Artigo submetido em 30/05/2019. Primeira revisão em 12/08/2019. Aceito para publicação em 09/12/2019 por recomendação do Editor Marcelo Cabral Cavalcanti. http://dx.doi.org/10.18618/REP.2019.4.0042 of these systems consider using parallel arrays of integrated modules (MIC) converters. In this approach all MICs operate independently of each other providing modularity and simplicity of installation and operation. In this work is proposed using a MIC topology based on a soft-switching high-gain isolated half-bridge dc-dc boost converter for this application. This converter is analyzed in detail and is proposed a new equation to determine the static gain of this topology considering the loss of cyclic ratio caused by the presence of the auxiliary switching inductance, a methodology for designing the auxiliary inductance aiming at guaranteeing the ZVS of all switches over a wide operating range, as well as the introduction of a cascaded control scheme for parallel operation of the MIC converters. Experimental results were obtained in similar 130 W prototypes operating with their outputs connected in parallel, demonstrating the viability of the topology for the application as well as the proposed control system.
光伏系统组件成本的显著降低改变了这些系统未来应用的前景。目前由于非最佳朝向和部分遮阳条件而废弃的许多安装地点可能在经济上可行。此外，建筑一体化光伏系统(BIPV)也有推广的趋势。一个有趣的方法来最大化功率转换Artigo submetido 30/05/2019。Primeira revision 9 em 12/08/2019。Aceito para public a o em 09/12/2019强烈推荐a o编辑马塞洛·卡布拉尔·卡瓦尔康蒂。这些系统的http://dx.doi.org/10.18618/REP.2019.4.0042考虑使用集成模块(MIC)转换器的并行阵列。在这种方法中，所有mic相互独立运行，提供模块化和简单的安装和操作。在这项工作中，建议使用基于软开关高增益隔离半桥dc-dc升压转换器的MIC拓扑。对该变换器进行了详细的分析，并提出了一个新的公式来确定该拓扑的静态增益，考虑到辅助开关电感的存在引起的循环比损失，一种旨在保证所有开关在宽工作范围内的ZVS的辅助电感设计方法，以及引入了级联控制方案，用于MIC变换器并联工作。在输出并联的类似130 W样机中获得了实验结果，证明了拓扑结构在应用以及所提出的控制系统中的可行性。
{"title":"High Voltage Gain Isolated DC-DC Converter for Integration in Photovoltaic Modules","authors":"Carolina Knaesel, L. Michels, A. Batschauer, M. Mezaroba","doi":"10.18618/rep.2019.4.0042","DOIUrl":"https://doi.org/10.18618/rep.2019.4.0042","url":null,"abstract":"Significant cost reduction of photovoltaic system components has changed the perspective of future application of these systems. Many installation sites currently discarded due to non-optimal orientations and partial shading conditions may become economically viable. Moreover, there is a tendency for the dissemination of building integrated photovoltaic systems (BIPV). An interesting approach to maximizing the power conversion Artigo submetido em 30/05/2019. Primeira revisão em 12/08/2019. Aceito para publicação em 09/12/2019 por recomendação do Editor Marcelo Cabral Cavalcanti. http://dx.doi.org/10.18618/REP.2019.4.0042 of these systems consider using parallel arrays of integrated modules (MIC) converters. In this approach all MICs operate independently of each other providing modularity and simplicity of installation and operation. In this work is proposed using a MIC topology based on a soft-switching high-gain isolated half-bridge dc-dc boost converter for this application. This converter is analyzed in detail and is proposed a new equation to determine the static gain of this topology considering the loss of cyclic ratio caused by the presence of the auxiliary switching inductance, a methodology for designing the auxiliary inductance aiming at guaranteeing the ZVS of all switches over a wide operating range, as well as the introduction of a cascaded control scheme for parallel operation of the MIC converters. Experimental results were obtained in similar 130 W prototypes operating with their outputs connected in parallel, demonstrating the viability of the topology for the application as well as the proposed control system.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131719587","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 : 2019-12-30DOI: 10.18618/rep.2019.4.0033
Gustavo Oliveira Fortes, Marcos Antônio Ferreira Mendes, P. C. Cortizo
– The use of series connected IGBTs is still a current subject in literature, despite such discussion having started in the 1990s. Though countless academic studies, there are currently no available commercial products on the market for medium voltage inverters (up to 4.16kV) and lower power (up to 1MW) using this technology. This is related to the difficulty of ensuring the dynamic and static voltage sharing between IGBTs, giving rise to relatively expensive complex firing circuits, when compared to the components they intend to control. Therefore, this article aims to present a simple and low-cost alternative, still effective for driving low voltage series-connected IGBTs, specifically for the encapsulation TO-247 type. Experimental results are presented showing the behavior of the solution under several operating conditions.
{"title":"Solução Integrada para o Disparo de IGBTs Conectados em Série Baseada no Comando Típico de Tiristores","authors":"Gustavo Oliveira Fortes, Marcos Antônio Ferreira Mendes, P. C. Cortizo","doi":"10.18618/rep.2019.4.0033","DOIUrl":"https://doi.org/10.18618/rep.2019.4.0033","url":null,"abstract":"– The use of series connected IGBTs is still a current subject in literature, despite such discussion having started in the 1990s. Though countless academic studies, there are currently no available commercial products on the market for medium voltage inverters (up to 4.16kV) and lower power (up to 1MW) using this technology. This is related to the difficulty of ensuring the dynamic and static voltage sharing between IGBTs, giving rise to relatively expensive complex firing circuits, when compared to the components they intend to control. Therefore, this article aims to present a simple and low-cost alternative, still effective for driving low voltage series-connected IGBTs, specifically for the encapsulation TO-247 type. Experimental results are presented showing the behavior of the solution under several operating conditions.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122518476","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 : 2019-12-30DOI: 10.18618/rep.2019.4.0032
Danilo Henrique Wollz, S. A. O. Silva, L. P. Sampaio
This work presents the development of an electronic wind emulator (EWEm), which involves the dynamic models of the wind turbine, the permanent magnet synchronous generator and the mechanical coupling turbine-generator. These models are used to generate the EWEm voltage references, which are synthesized by a three-phase three-wire voltage source inverter, so that a real wind turbine can be emulated at different wind speeds. As advantages, the proposed EWEm presents low cost of implementation and versatility in the emulation of different models of Artigo submetido em 25/04/2019. Primeira revisão em 13/06/2019. Aceito para publicação em 15/11/2019 por recomendação do Editor Marcello Mezaroba. http://dx.doi.org/10.18618/REP.2019.4.0032 commercial wind turbines, making possible the accomplishment of several researches in the laboratory. A three-phase controlled rectifier is used in the input stage of the EWEm to control the DC-bus voltage of the inverter, as well as drain sinusoidal currents from the grid, so that an effective power factor correction is achieved. Both mathematical models of the inverter and the input rectifier are represented in the synchronous reference frame dq. In order to validate the study, as well as to evaluate the static and dynamic performances of the proposed EWEm, experimental results are presented considering the system subjected to different types of load and wind profiles.
本文介绍了一个电子风模拟器(EWEm)的开发，该模拟器包括风力发电机、永磁同步发电机和机械耦合涡轮发电机的动力学模型。利用这些模型生成EWEm参考电压，通过三相三线制电压源逆变器合成EWEm参考电压，实现对真实风力机在不同风速下的仿真。所提出的EWEm具有低实施成本和通用性的优点，可用于仿真不同型号的Artigo submetido(25/04/2019)。Primeira revision 9 em 13/06/2019。Aceito para public a o em 15/11/2019强烈推荐a o编辑Marcello Mezaroba。http://dx.doi.org/10.18618/REP.2019.4.0032商用风力涡轮机，使得在实验室完成几项研究成为可能。在EWEm的输入级使用三相可控整流器来控制逆变器的直流母线电压，以及从电网中漏出正弦电流，从而实现有效的功率因数校正。逆变器和输入整流器的数学模型都用同步参考系dq表示。为了验证研究结果，以及评估所提出的EWEm的静态和动态性能，给出了考虑系统在不同类型负载和风廓线下的实验结果。
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Pub Date : 2019-12-30DOI: 10.18618/rep.2019.4.0044
P. Praça, José W.M. Araújo, D. Honório, D. S. Junior, L. Barreto
– This paper proposes the study and development of a single-stage multilevel AC-DC converter for application in Solid-State Transformers (SST). The proposed topology is based on the dual active bridge (DAB) converter associated with the three-state switching cell (3SSC). The converter’s structure is able to be scalled-up, by basic modules, and then be applied at high voltages, as well as operate as rectifier or inverter. In order to validate the entire study, a prototype was assembled with two 1 kW modules, with 110 V AC input voltage, 400 V primary and secondary bus voltage, and 20 kHz switching frequency. The experimental results clearly and consistently show the correct operation of the converter. The bi-directionality was demonstrated by the experimentals tests. The topology is capable of operating with high power factor and low THD, as well.
{"title":"Single-Stage AC-DC Cascaded Converter for Applications in Solid State Transformers","authors":"P. Praça, José W.M. Araújo, D. Honório, D. S. Junior, L. Barreto","doi":"10.18618/rep.2019.4.0044","DOIUrl":"https://doi.org/10.18618/rep.2019.4.0044","url":null,"abstract":"– This paper proposes the study and development of a single-stage multilevel AC-DC converter for application in Solid-State Transformers (SST). The proposed topology is based on the dual active bridge (DAB) converter associated with the three-state switching cell (3SSC). The converter’s structure is able to be scalled-up, by basic modules, and then be applied at high voltages, as well as operate as rectifier or inverter. In order to validate the entire study, a prototype was assembled with two 1 kW modules, with 110 V AC input voltage, 400 V primary and secondary bus voltage, and 20 kHz switching frequency. The experimental results clearly and consistently show the correct operation of the converter. The bi-directionality was demonstrated by the experimentals tests. The topology is capable of operating with high power factor and low THD, as well.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124741140","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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