Powerside’s Post

I'm excited to share that our paper, "Planning for Electric Vehicle Evacuations: Energy, Infrastructure, and Storage Needs," has been accepted for an oral presentation at the 2024 IEEE Vehicle Power and Propulsion Conference (IEEE VPPC 2024) in Washington, DC, USA, from October 7-10, 2024. With the rapid increase in electric vehicle (EV) adoption, addressing their power needs during disaster evacuations is crucial, especially when the grid fails. Our paper offers a comprehensive analysis of EV energy requirements during evacuations using a pragmatic stochastic methodology. It evaluates the power needs of charging infrastructure across various evacuation scenarios and benchmarks them against existing infrastructure in several California cities. Moreover, the paper explores the necessary size of backup lithium battery storage to ensure EVs are adequately powered during evacuations without grid support. I want to thank Prof. Ricardo de Castro for his insightful analyses in developing the pragmatic stochastic methodology and his invaluable contributions to this paper. I also want to thank my Ph.D. advisor, Prof. Sarah Kurtz, for her persistent support and guidance throughout this project. #Electric_vehicles #Energy_storage #lithium_batteries #charging_infrastructure #renewables https://lnkd.in/gMZXyxnF

Watch the recording of our webinar on Test-Driven Design: Digital Control of Grid-Tied Converters to explore cutting-edge techniques in power electronics and grid modernization. Learn from experts at Universidade Federal de Santa Maria - GEPOC - Power Electronics and Control Research Group as they demonstrate the power of test-driven design and real-time simulation in enhancing converter reliability and performance. Don't miss the insights from this webinar on digital control, grid-connected converters, and the future of grid modernization - register to watch here: https://lnkd.in/dDfuvV8M #PowerElectronics #GridModernization #TestDrivenDesign #DigitalControl #GridConnectedConverters #RenewableEnergy

march 17, 2024. 6:37 PM. hello Dr. Wang we talked about this before I took your three phase and a two phase demonstration. Gave you credit during the presentation and played it before this attached presentation on an earlier paper I wrote in 2018 but it was not delivered because of Covid until like 2022. I mentioned audience, which was the IEEE PES switch gear committee and clearwater Florida, that is quite evident that the notching or the harmonic content between three phase and what you showed for two phase shows the lower harmonic content, and I kept clicking between the two models that you had created to show the audience the details I’ve seen in many other documents, created by Westinghouse corporation. That’s kind of been buried, because we elected to go with three phase rather than what Tesla originally designed, which doesn’t have a DC component. DC component I mean the cancellation of the third harmonic by the fifth seventh ninth and higher harmonics between the major sources of a 3 system, the rotor bars are infinite number. In one of your other post, you showed this mathematics by running for near series and also you did that demonstration little over year ago, showing that the harmonic content essentially went to zero as it would do so if you ran the mathematical equations. So the offer to you is if you could run this model from the back of a napkin envelope sketch that I just sent onto your post I would again play it at another eye Tripoli meeting this fall in front of the utilities of IEEE on Tuesday. I like a year ago I don’t have any formal slot to provide other than the lobby or something like that to various members but you know I’m really important that I show this to utilities cause I think you’d be interested in what southern California Edison is doing because essentially they’re using a peterson or resonant circuit tune system to eliminate the harmonic content that I been discussing. Attached is that presentation but the Tuesday luncheon. You’ll also see the California Edison presentation, which is a real system that they’ve been operating. This topic came up in 2019 at the San Diego conference and last fall. I talked about it to numerous people Siemens, ABB so on. Many people are interested in this detail, but they don’t have all the magnetics people in the modeling people like you - you are now very good at this. we both work for our Dr. Foss, I’m just old-school did it Excel and another methods. Bingsen Wang, PhD

Are you interested in #gridforming power converters, their fault ride through capability and dynamics for different grid strength during saturation and faulty condition when there are large grid disturbances such as voltage dips, voltage phase jumps, and rapid frequency changes? So, I am pleased to announce that our article with an original idea entitled "FRT Capability of Grid-Forming Power Converters: an Anti-Windup Scheme," is available under the Early Access area in the journal of IEEE Transactions on Power Electronics. I would like to express my sincere gratitude to my supervisors and colleagues during the project, Peiyuan Chen, Massimo Bongiorno, Bengt Johansson from Solvina AB, and Ritwik Majumder from Epiroc. The project was financed by The Swedish Energy Agency International under VindEl program. #Grid_Code Requirements #Fault_ride_through #GridFormingConformity #ENTSO #National_Grid #VDE Chalmers University of Technology Enjoy Reading :)

As our first collaboration with Prof. Xiongfei Wang, I am honored to share our preprint entitled "Operating Grid-Forming Converters with Power Angle in the Four-Quadrant Range" which was submitted recently to IEEE Transactions on Smart Grid. Link: https://lnkd.in/dPFVDkEi Well, you may ask: what would be the advantages of operating a GFM converter in scenarios with SCR<1 and with δ in four-quadrant range? The answer may be found in the Fig. 1 of our work, where one can observe that as the short-circuit level decreases, the operation with high loading brings higher injected reactive power. In the extreme scenario when SCR<1, the operation with δ in second and third quadrants could bring the benefit of enhanced voltage support while keeping the output current within the capacity of the converter. The contributions of this work are the following: > it is demonstrated that operation with δ in four quadrant range is physically possible when SCR<1 for any condition of grid impedance X/R ratio; > a strategy for enhancement of transient stability of GFM converters in weak grid scenarios is proposed, which is applicable for dispatchable Virtual Oscillator Control (dVOC-) and Virtual Synchronous Generator (VSG-) based GFM converters; > a proposal of a new PF-related quantity, termed in this work as Weighted Power Factor (WPF), which is invariant to changes in grid impedance X/R ratio and can bring a more accurate information on converter loading. This work is an improved version of our previous work presented in [1], where we presented a strategy for dVOC-based GFM converters in ultra-weak grid scenarios, so that the GFM converter could operate with SCR<1 with δ in the four-quadrant range in dominantly inductive lines. In preparing this work we realized that the transient stability limit of δ of 90 electrical degrees was first elaborated by Charles P. Steinmetz (a.k.a. The Wizard of Schenectady) more than one hundred years ago in the context of parallel operation of Synchronous Machines [2] and has been applied ipsis litteris for transient stability analysis and enhancement methods for GFM converters. We hope that our work may open a new perspective on how to leverage the enhanced power processing capabilities of power converters in providing services to the power grids. We thank Graduate Program in Electrical Engineering/Universidade Federal de Campina Grande, CNPq and CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior for funding this work. Please take a look at our work and, if possible, provide some comments/critics. It is all about pursuing the excellence! [1] A. J. G. Abrantes-Ferreira, A. C. Oliveira, and A. M. Lima, “Dispatchable virtual oscillator inverter: Fault mitigation in weak grids,” in Conf. Rec. IEEE/ECCE, Nashville, USA, 2023, pp. 1059–1066 [2] C. P. Steinmetz, “Power control and stability of electric generating stations,” Trans. Am. Inst. Electr. Eng., vol. 39, no. 2, pp. 1215–1287, 1920

I had the pleasure of participating in the #SPEEDAM 2024 (International Symposium on Power Electronics, Electrical Drives, Automation, and Motion) conference held in beautiful Ischia (Naples) last week. During the conference, I presented a paper titled "Optimal Sizing of Supercapacitor-Based Energy Storage for DC Rail Transit Systems Using an Analytic Hierarchy Process Approach." This paper introduces a novel multi-objective optimal linear power flow method to determine the optimal size of wayside energy storage systems within DC rail transit systems.

📚 Compulsory reading for all power system stability engineers! New TB 928! 🔎 As the energy transition gains momentum worldwide – which comes along with a dominating role of converter-based generation - power grids undergo fundamental changes. 👨💻 👩💻 Therefore, novel stability-related challenges need to be solved. Here, the recently published CIGRE Technical Brochure 928 - Multi-frequency stability of converter-based modern power provides a crucial contribution by presenting state-of-the-art stability analysis and instability mitigation methods. 👌 From a personal point of view, it has been a pleasure to work with such an extraordinary group of experts, and support some of the sub-tasks. 🎉 Congratulations to the convenor Łukasz Kocewiak, the secretary Christoph Buchhagen, and all group members for this remarkable result! #Cigre #CigreC4 #powergrids #powersystems #stability #energytransition #HVDC #FACTS #batterystorage #offshorewindenergy #hydrogen #powerelectronics #electrolyzers #EV  #charginginfrastructure #emobility #EMT https://lnkd.in/eieUM7G9

💡 Worth a read! New CIGRE TB 928! 📖 A key contribution to understanding, analyzing, and mitigating instability in modern power systems! #Cigre #CigreC4 #powergrids #powersystems #stability #energytransition #HVDC #FACTS #batterystorage #offshorewindenergy #hydrogen #powerelectronics #electrolyzers #EV  #charginginfrastructure #emobility  #EMT    #mosaicgridsolutions 

Peltier control - a game changer when it comes to battery modelling! Peltier elements must be some of the coolest electrical devices I have ever come across (pun intended). They use the thermoelectric/Peltier effect, which is itself quite unbelievable - an ability to use electric current to pump heat in a solid state device. Simply put, one side gets hot and the other cold under current flow, with the opposite happening when you reverse the current. For two very sweaty years of my PhD I developed a very low cost, ultra fast Peltier controller with Alastair Hales. Today we have scaled that up at About:Energy and we use it for all of our battery testing. Check out our blog here which covers how this impacts battery modelling: https://lnkd.in/dSUA_d6k

The removal of the conductor length for supply side connections is especially interesting to me. It open up solutions and keeps us more in line with the service conductors.