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Grid-Forming MMC: A Comparison Between Single- and Dual-Loop Control Approaches 网格形成MMC:单环和双环控制方法的比较
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684077
Cleiton M. Freitas, E. Watanabe, L. Monteiro
{"title":"Grid-Forming MMC: A Comparison Between Single- and Dual-Loop Control Approaches","authors":"Cleiton M. Freitas, E. Watanabe, L. Monteiro","doi":"10.1109/COBEP53665.2021.9684077","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684077","url":null,"abstract":"This work presents an analysis of the grid-forming Modular Multilevel Converter (MMC), in the frequency domain, when it is controlled through single or dual-loop implementation. The dual-loop approach presents an inner current-loop control gathered with the external voltage-loop control, whereas the single-loop only presents a voltage-loop control for the grid-forming capability. In both cases, the control algorithms were implanted in a natural reference frame, including resonant controllers. The paper follows an impedance-modeling approach for introducing the analytical representation of the MMC in the frequency domain. These representations are, in fact, the linearized Teéenin-equivalent models of the single- and dual-loop grid-forming MMC. The results showed that the inner current-loop control is a feasible approach for damping specific resonant peaks of the Thevenin-equivalent impedance. In other words, the current-control loop adds a resistive parcel in MMC impedance in the frequency range in which the resonant peaks appear. As a consequence, the LC resonance between this impedance and the capacitor bank in the main bus is damped. The article also contains some switching-level EMTDC/PSCAD simulations to validate the work.","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126143224","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}
引用次数: 2
A Comparative Analysis of the Main Methods for Tracing PV Characteristic Curve Through Experimental Tests 通过试验对比分析了PV特性曲线示踪的主要方法
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684074
João T. de Carvalho Neto
{"title":"A Comparative Analysis of the Main Methods for Tracing PV Characteristic Curve Through Experimental Tests","authors":"João T. de Carvalho Neto","doi":"10.1109/COBEP53665.2021.9684074","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684074","url":null,"abstract":"In recent years, many different techniques for inspecting and diagnosing photovoltaic (PV) cells and PV modules in laboratories have been evaluated in detail. Most of them consist of analysis by obtaining the characteristic curve of the PV source. Several methods of obtaining current and voltage PV curves are addressed in the literature. However, they still do not address the experimental aspects of implementation and the obtained results from these methods. This paper consists of a comparative analysis of the main methods of obtaining PV cells' current vs voltage characteristic curves, observing the following aspects that characterize their effectiveness: flexibility, fidelity, and response time to trace the curve, complexity, cost of implementation, and applicability. The main methods analyzed in this project are variable resistance, electronic load, capacitive load, and DC-DC converters.","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127068282","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}
引用次数: 0
vv- DTC for Healthy and Faulty Operation of an Asymmetrical Six - Phase Induction Machine Drive System With Single Neutral 单中性点不对称六相感应电机驱动系统健康与故障运行的vv- DTC
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684138
V. B. Melo, Gilielson F. da Paz, I. S. de Freitas
{"title":"vv- DTC for Healthy and Faulty Operation of an Asymmetrical Six - Phase Induction Machine Drive System With Single Neutral","authors":"V. B. Melo, Gilielson F. da Paz, I. S. de Freitas","doi":"10.1109/COBEP53665.2021.9684138","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684138","url":null,"abstract":"This paper discusses a Direct Torque Control (DTC) strategy for an asymmetrical six-phase induction machine drive system that makes use of an isolated single neutral. By means of simulations, it is shown that the proposed method provides proper healthy and postfault operation when a single-phase open-circuit fault occurs. A natural fault-tolerance feature is observed, since the control algorithm does not need to be reconfigurated when the system migrates from healthy to postfault operation.","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127587369","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}
引用次数: 1
Three-port isolated DC-DC converter with LQG/LTRI robust control applied to photovoltaic systems with energy storage 基于LQG/LTRI鲁棒控制的三端口隔离DC-DC变换器应用于储能光伏系统
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684068
D. P. Damasceno, Clauson Sales do N. Rios, Samanta Gadelha Barbosa, L. Barreto, wilkley bezerra correia, Fabricio Gonzalez Nogueira, D. de S. Oliveira
{"title":"Three-port isolated DC-DC converter with LQG/LTRI robust control applied to photovoltaic systems with energy storage","authors":"D. P. Damasceno, Clauson Sales do N. Rios, Samanta Gadelha Barbosa, L. Barreto, wilkley bezerra correia, Fabricio Gonzalez Nogueira, D. de S. Oliveira","doi":"10.1109/COBEP53665.2021.9684068","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684068","url":null,"abstract":"This work proposes to use a centralized multi-variable control strategy for an isolated three-port DC-DC converter, which interfaces a photovoltaic panel, a battery, and a DC bus. The proposed control consists of a Linear Quadratic Gaussian (LQG) approach with Loop Transfer Recovery (LTR) and integral action (LQG/LTRI) applied in a multivariable state-space model. It is designed to maintain stabilization and voltage tracking performance in the presence of step-type disturbances typical of abrupt variations in the solar incidence and load levels. Finally, simulation and experimental results are presented and discussed to validate the performance of the proposed approach.","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124412827","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}
引用次数: 0
Development of a Control Strategy for Power Management of an Electric Vehicle Hybrid Energy Storage System 电动汽车混合动力储能系统电源管理控制策略的研究
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684137
Matheus J. C. Souza, Lucas F. R. Lago, S.T. Faceroli, M. Rodrigues
{"title":"Development of a Control Strategy for Power Management of an Electric Vehicle Hybrid Energy Storage System","authors":"Matheus J. C. Souza, Lucas F. R. Lago, S.T. Faceroli, M. Rodrigues","doi":"10.1109/COBEP53665.2021.9684137","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684137","url":null,"abstract":"This paper focuses on a control strategy for the DC-DC converters of a two-level hierarchical control system for power management of a battery/supercapacitor-based electric vehicle hybrid energy storage system. Control strategy and detailed controller design are described. Simulation results are considered for evaluation of the performance of proposed approach regarding different scenarios using standard drive cycle data.","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121314188","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}
引用次数: 2
Analysis of Modulation Techniques for Reducing Common Mode Voltage in Variable Speed Drive Systems 变速传动系统中降低共模电压的调制技术分析
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684048
Sofia Maria Almeida Dias, N. Rocha, Gilielson Figueredo da Paz, I. Soares de Freitas
{"title":"Analysis of Modulation Techniques for Reducing Common Mode Voltage in Variable Speed Drive Systems","authors":"Sofia Maria Almeida Dias, N. Rocha, Gilielson Figueredo da Paz, I. Soares de Freitas","doi":"10.1109/COBEP53665.2021.9684048","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684048","url":null,"abstract":"This article proposes a comparative analysis between some control techniques that are able to considerably reduce the Common Mode Voltage (CMV), which is one of the main causes of failures in induction machines. Among the various solutions, there is the implementation of the Space Vector Modulation (SVM) and its variations, which depend on the choice and application of selected voltage vectors, such as Space Vector Pulse Width Modulation (SVPWM), Active Zero Space Pulse Width Modulation (AZSPWM) and others. It is also possible to implement the triggering of switches through the Finite Set Model Predictive Control (FS-MPC). Thus, computational simulations were carried out in order to obtain this analysis between strategies that reduce the CMV.","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123696940","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}
引用次数: 0
Comparative Analysis of PSO techniques applied in a Single-Phase Grid-Tied PV System PSO技术在单相并网光伏系统中的应用对比分析
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684047
Guilherme de L. Lopes, L. P. Sampaio, S. D. da Silva
{"title":"Comparative Analysis of PSO techniques applied in a Single-Phase Grid-Tied PV System","authors":"Guilherme de L. Lopes, L. P. Sampaio, S. D. da Silva","doi":"10.1109/COBEP53665.2021.9684047","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684047","url":null,"abstract":"Due to the nonlinearities present in the PV array characteristic curves (current versus voltage and power versus voltage), it is mandatory the use of maximum power point tracking (MPPT) to ensure the maximum PV array power has been extracted. Furthermore, when the PV array is subjected to partial shading conditions, the MPPT algorithms must deal with problems associated with global and local maximum powers. Therefore, to deal with partial shading problems, this paper presents a comparative analysis between the particle swarm optimization technique and its variations, such as PSO Classic (PSO 1), PSO Non-linear (PSO 2) and PSO Improved-Chaos (PSO 3). By simulation results the PSO techniques are evaluated to each other taking into account the time to reach the global maximum power, the extracted PV array power, as well as the power oscillation in steady-state.","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"313 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114295012","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}
引用次数: 2
Study of High Step-up Non-isolated DC-DC Converters 高升压非隔离DC-DC变换器的研究
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684149
A. A. de Melo Bento, Christian Mothe de Castro, Lucas Cheida Galvão Sanches Garcia
{"title":"Study of High Step-up Non-isolated DC-DC Converters","authors":"A. A. de Melo Bento, Christian Mothe de Castro, Lucas Cheida Galvão Sanches Garcia","doi":"10.1109/COBEP53665.2021.9684149","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684149","url":null,"abstract":"Several high gain DC-DC converters are presented in the technical literature, including isolated and non-isolated solutions. Such converters are widely employed in single-phase low power PV and UPS. A comparative study involving four non-isolated topologies is carried out in this paper and considers features as efficiency, robustness, dynamics, cost, volume, and modularization capability. The study is supported by simulation and experimental essays to confirm theory and feasibility, respectively","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124300919","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}
引用次数: 0
Estimation of Electromagnetic Losses Associated with the Buck Ferrite Core Inductor Buck铁氧体铁芯电感电磁损耗的估计
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684125
Juan Pablo Ochoa Avilés, J. D. dos Reis, E. M. Vicente, E. R. Ribeiro
{"title":"Estimation of Electromagnetic Losses Associated with the Buck Ferrite Core Inductor","authors":"Juan Pablo Ochoa Avilés, J. D. dos Reis, E. M. Vicente, E. R. Ribeiro","doi":"10.1109/COBEP53665.2021.9684125","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684125","url":null,"abstract":"Direct current (DC-DC) converters, for example, buck, boost, buck-boost, etc., present different types of energy losses, which are converted into heat. In the literature, there are several analyses of losses associated with semiconductor and energy storage elements. However, recently the analysis of the losses associated with the electromagnetic elements that make up these topologies has been considered. In this context, this article presents a computational evaluation, based on Steinmetz's equations and finite element analysis using the MatEditor software, to estimate the electromagnetic losses in ferrite cores in the inductor of the buck converter. This evaluation is performed to the cores manufactured in Brazil because their datasheets do not allow to obtain an estimate of core loss as function of the magnetic flux continuous variation. Thus, from the proposed approach, it is possible to create graphs to visually assess the electromagnetic losses of the ferrite core and choose the core with the smallest loss in order to use it to construct the buck converter inductor.","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123020854","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}
引用次数: 0
Comparative Performance Analysis of Grid-Forming Strategies Applied to Disconnectable Microgrids 可分离微电网成网策略的性能比较分析
2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI: 10.1109/COBEP53665.2021.9684127
A.J.G. Abrantes-Ferreira, A. Lima
{"title":"Comparative Performance Analysis of Grid-Forming Strategies Applied to Disconnectable Microgrids","authors":"A.J.G. Abrantes-Ferreira, A. Lima","doi":"10.1109/COBEP53665.2021.9684127","DOIUrl":"https://doi.org/10.1109/COBEP53665.2021.9684127","url":null,"abstract":"In the scenario of growing penetration of Distributed Generation (DG) units, grid-forming (GFM) strategies are emerging as important candidates to become key players in future low inertia grids. These methods are either based on emulation of synchronous machines at different levels of abstraction or based on the behavior of nonlinear oscillators, the so-called dispatchable Virtual Oscillator Control (dVOC). However, it is not clear which are the strengths and weaknesses of each GFM technique in a general comparative scenario of operation in systemic operation. In this work, part of this question were addressed, where firstly a novel Linear-Droop dVOC-based strategy is proposed and qualitatively compared to another dVOC-based strategy and to Conventional Doop Control in a application scenario of a disconnectable low-voltage microgrid with the aim of evaluating the transient and steady state performance in scenarios of (dis)connenction of loads in both grid-connected and islanded operating modes through time-domain simulations via PSIM™. dVOC-based methods presented overall superior transient performance compared to Droop Control, reaching settling times 8x faster for islanded-mode operation and 4x faster for grid-connected operation. Furthermore, for operation with higher X/R ratio dVOC-based methods presented overall superior transient and steady-state performance compared to Droop Control. On the other hand, the results showed that dVOC-based methods regulates inverter output voltage and frequency based on droop relationships of internal oscillator model quantities, making unclear what is the behavior of quantities at the output of the inverter, which may degrade effectiveness of active and reactive power sharing between GFM units.","PeriodicalId":442384,"journal":{"name":"2021 Brazilian Power Electronics Conference (COBEP)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123324970","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}
引用次数: 2
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