Electronic Load for Parameter Characterization in Equivalent Circuit Models of Lithium-Ion Batteries-Suelen Bampi 1,* , Gierri Waltrich 1 , Anderson Vaccari 2 1Federal University of Santa Catarina, Postgraduate Program in Electrical Engineering, Florianopolis - SC, Brasil. 2Vale S.A, Development and Innovation Sector, Vila Velha - ES, Brasil.

 Electronic Load for Parameter Characterization in Equivalent Circuit Models of Lithium-Ion Batteries Suelen Bampi1,*, Gierri Waltrich 1, Anderson Vaccari2 1 Federal University of Santa Catarina, Postgraduate Program in Electrical Engineering, Florianopolis - SC, Brasil. 2 Vale S.A, Development and Innovation Sector, Vila Velha - ES, Brasil. 

 ABSTRACT The applications and implemented volume of lithium-ion batteries have been gaining momentum each year. Aiming to contribute to the development of research in this area, this paper presents the design and implementation of an electronic load focused on characterizing parameters inherent to equivalent circuit models (ECM). ECMs are commonly applied for estimating the State of Charge (SoC), State of Health (SoH), and Remaining Useful Life (RUL) of lithium batteries. In this paper, an electrical design of an electronic load was implemented and validated through laboratory instrumentation to obtain characteristic data from a lithium titanate cell. The data from the tests performed on the cell were used as input for a SoC estimation algorithm based on the Extended Kalman Filter (EKF) to help corroborate the prototype's performance. The results comprise the performance of the electronic load, the results associated with the parameterization tests of the lithium cells, and the results obtained for the cell’s SoC estimation using the EKF.

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https://www.scielo.br/j/epot/a/ZShrcqBM9QL6k33XyFSLSFj/?format=pdf&lang=en

Analysis and Implementation of a Single-Phase Bridgeless Hybrid Switched-Capacitor Rectifier in Discontinuous Conduction Mode for Power Factor Correction-

 

Analysis and Implementation of a Single-Phase Bridgeless Hybrid Switched-Capacitor Rectifier in Discontinuous Conduction Mode for Power Factor Correction

 Chrystian Mumic 1,∗, Marcus V. Soares 2, Yales R. de Novaes 1, Alan J. Watson 3 1Santa Catarina State University, Dept of Electrical Engineering, Joinville, Brazil. 2Silicon Austria Labs, Division Power Electronics, Graz, Austria. 3University of Nottingham, Dept. Electrical and Electronic Engineering, Nottingham, United Kingdom.

ABSTRACT 

This work presents the quantitative and qualitative analysis, as well as the experimental results of a practical implementation of the Single-Phase Bridgeless Hybrid Switched Capacitor Rectifier operating in discontinuous conduction mode (DCM) to achieve a high input power factor. Operating in DCM provides several advantages, including natural power factor correction (PFC) behavior of the input current and reduced semiconductor switching losses. The paper begins with a literature review on key studies of hybrid switched-capacitor converters with a high power factor. Subsequently, the converter analysis, including its modulation scheme, operational stages and design methodology, is detailed. The proposed approach is validated with results from a practical prototype implementation, achieving an output voltage of 1200 V and an output power of 315 W from an input voltage of 220 V. The converter demonstrated an efficiency of 97.3%, a power factor of 0.99, and harmonic distortion levels within the limits specified by IEC61000-3-2.

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https://www.scielo.br/j/epot/a/5y7jTFXzM53WrZB7W5zKdWP/?format=pdf&lang=en

UAPFs topologies with UPS features for low and medium voltage applications-Welflen Ricardo Nogueira Santos1 , Eisenhawer de Moura Fernandes2, Edison Roberto Cabral da Silva2, Marcus Andre Barros Nogueira Carneiro1, Antonio Airton Carneiro de Freitas1, Patryckson Marinho Santos3

 

UAPFs topologies with UPS features for low and medium voltage applications 

 Welflen Ricardo Nogueira Santos1 , Eisenhawer de Moura Fernandes2, Edison Roberto Cabral da Silva2, Marcus Andre Barros Nogueira Carneiro1, Antonio Airton Carneiro de Freitas1, Patryckson Marinho Santos3 1Electrical Engineering Department, Federal University of Piauí, Campus Universitário Ministro Petrônio Portella, s/n Bairro Ininga, 64049-550, Teresina – PI, Brazil 2Mechanical Engineering Department, Federal University of Campina Grande, R. Aprígio Veloso, 882 – Universitário, 58429-900, Campina Grande – PB, Brazil 3Electrical Engineering Department, Federal University of Maranhão, Av. dos Portugueses, 1966 – Vila Bacanga, 65080-805, São Luís – MA, Brazil

 Abstract: Some configurations of universal active power filter (UAPF) with uninterruptible power supplies (UPSs) features for single-phase applications are proposed in this study focus on a reduced number of power electronic switches. All proposed configurations, composed by two-leg converters, compensate for current and voltage harmonics and provide power factor control close to one. Comparisons between the structures are made in terms of converters voltage capabilities, shared-leg, and capacitor currents. The model of the systems, including the equations and control system, is detailed described. Steady-state analysis of the proposed configurations demonstrates the existence of a load angle, which reduces the converters current, increasing the efficiency of the proposed systems. A complete set of simulated and experimental results are presented. 

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https://www.academia.edu/27448011/A_Novel_AC_UPS_With_High_Power_Factor_and_Fast_Dynamic_Response?email_work_card=view-paper 

YAKOVLEV,Streklov, El'stin, Khaikin - Problems in Undergraduate Physics Volume II Electricity and Magnetism

 

This set of four books of problems is based on a translation of a Russian collection which has been in use by students in physics at Moscow State University and the Moscow Physico-Technical In­stitute for a number of years. Where appropriate, answers and solutions to the problems are given in the second part of each volume.

VIEW BOOK : https://archive.org/details/problems-in-undergraduate-physics-volume-ii-electricity-and-magnetism

Stability Enhancement of Inverter-dominated power systems with virtual inertia control by Lalitha Subramanian -THÈSE Pour obtenir le grade de DOCTEUR DE L’UNIVERSITÉ GRENOBLE ALPES Spécialité : GENIE ELECTRIQUE

Stability Enhancement of Inverter-dominated power systems with virtual inertia control Lalitha Subramanian THÈSE Pour obtenir le grade de DOCTEUR DE L’UNIVERSITÉ GRENOBLE ALPES Spécialité : GENIE ELECTRIQUE 

 SUMMARY

 The electric power system has been traditionally energized by synchronous machines like steam turbines, hydro turbines, and diesel engines. These rotating machines inherently contribute to the system resilience by providing rotational inertia. The presence of an adequate inertia in the system provides the liberty of allowing a control delay for the governor-input valve controls to respond to the frequency deviation. With the displacement of synchronous machines by converter-connected sources, the reduction of inherent system inertia is evident. However, there is also a counterpoised observation that the required amount of inertia in the transformed power system is reduced, given the faster response of the converter-based DERs. Therefore, we resort to synthetic inertia to improve the resilience of a low-inertia grid. In this context, this thesis explores questions such as: What is the adequate synthetic inertia/frequency response capability for a stable power system? How can we quantify the flexibility required to provide this adequate inertia? Does inertia greater than the adequate level necessarily indicate a higher stability margin? How different is the effect of distributed synthetic inertia on the oscillatory stability compared to synchronous inertia? Firstly, the aspects of flexibility and methods to characterize them for an adequate synthetic inertia and fast-frequency response are addressed. A generalized virtual storage flexibility model has been proposed to quantify the heterogeneous bidirectional flexibilities and their combination to provide a certain level of synthetic inertia. As an illustration, a hybrid energy storage system has been sized to provide synthetic inertia and fast-frequency response for a standard power network.The subsequent chapters discuss synthetic inertia and fast-frequency control actuated by PV systems with hybrid energy storage. In this thesis, inverter control has been explored with a complete DC-side model takes into account the effects of PV intermittency, unlike most research works on inverter control that assumes a sufficiently large DC source/sink. Synthetic inertia controllers are categorized as grid-following and grid-forming topologies, which significantly affect their impact on system stability. Conventionally, the inertia and damping parameters are tuned and fixed over a scheduled time slot based on the available flexibility. It has been identified that a higher inertia is required on the occurrence of a disturbance to limit the rate of frequency deviation and a higher damping is required for a faster settling time. Therefore, for each of the control topologies, a rule-based real-time inertia tuner has been proposed to optimize the frequency deviation, its rate, and the settling time. The algorithm has been improved through a model predictive control with a rate-based linearization. The rate-based linearization extends the model validity to the transient zones.For systems with multiple grid-formers and multiple frequency responsive units, a distributed optimization problem has been formulated and solved to collectively tune the inertia and damping parameters which are constrained by the available flexibilities.The efficacy of distributed grid-forming and grid-following synthetic inertia in replacing their synchronous counterpart in a microgrid has been compared. Microgrid regulation in grid-connected and islanded modes have been studied by modeling the DERs with discussed control strategies. The impact of the two types of synthetic inertia controls on the small signal stability of the system are examined by modal analysis and bifurcation plots to derive the conditions for oscillatory stability in a microgrid with distributed synthetic inertia reserves. The effectiveness of the proposed control strategies in restoring the frequency stability of low-inertia systems has been validated by power hardware-in-the-loop experimentation.

VIEW FULL THESIS: https://theses.hal.science/tel-03505925v1/document