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2024 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2024

作者： Algikar, Pooja Mili, Lamine Karra, Kiran Algikar, Akash Hassine, Mohsen Ben Electrical and Computer Engineering Northern Virginia Center Virginia Tech United States Protocol Labs Los AngelesCA United States Synopsys Inc Telangana Hyderabad India University of El Manar Department of Computer Science Tunisia

ISBN: (纸本)9798350313604

The dynamics of a power system with a significant presence of renewable energy resources are growing increasingly nonlinear. This nonlinearity is a result of the intermittent nature of these resources and the switching behavior of their power electronic devices. Therefore, it is crucial to address these nonlinearity in the blind source separation methods. In this paper, we propose a blind source separation of a linear mixture of dependent sources based on copula statistics that measure the non-linear dependence between source component signals structured as copula density functions. The source signals are assumed to be stationary. The method minimizes the Kullback-Leibler divergence between the copula density functions of the estimated sources and of the dependency structure. The proposed method is applied to data obtained from the time-domain analysis of the classical 11-Bus 4-Machine system. Extensive simulation results demonstrate that the proposed method based on copula statistics converges faster and outperforms the state-of-the-art blind source separation method for dependent sources in terms of interference-to-signal ratio. © 2024 IEEE.

关键词： Blind source separation

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A Measurement-Based Robust Non-Gaussian Process Emulator Applied to Data-Driven Stochastic Power Flow

A Measurement-Based Robust Non-Gaussian Process Emulator App...

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2022 IEEE Power and Energy Society General Meeting, PESGM 2022

作者： Algikar, Pooja Xu, Yijun Mili, Lamine Electrical and Computer Engineering Northern Virginia Center Virginia Tech Falls ChurchVA22043 United States

ISBN: (数字)9781665408233

ISBN: (纸本)9781665408233

In this paper, we propose a robust non-Gaussian process emulator based on the Schweppe-type generalized maxi-mum likelihood estimator, which is trained on metered time series of voltage phasors and power injections to perform stochastic power flow. Power system data are often corrupted with outliers caused by fault conditions, power outages, and extreme weather, to name a few. The proposed emulator bounds the influence of the outliers using weights calculated based on projection statistics, which are robust distances of the data points associated with the rows vectors of the factor space. Specifically, the developed estimator is robust to vertical outliers and bad leverage points while retaining good leverage points in the measurements of the training dataset. The proposed method is demonstrated on an unbalanced radial IEEE 33-Bus system heavily integrated with renewable energy sources. © 2022 IEEE.

关键词： Outages

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Effect of Magnetic Couplings on Conducted EMI of GaN-Based PFC Converter 14

Effect of Magnetic Couplings on Conducted EMI of GaN-Based P...

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14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025

作者： McGrew, Tyler Li, Qiang Virginia Tech Center for Power Electronic Systems The Bradley Department of Electrical and Computer Engineering BlacksburgVA United States

ISBN: (纸本)9798331516116

Wide-bandgap power devices have enabled power supplies to increase in density while maintaining high efficiency. However, EMI issues remain one of the most challenging aspects when designing a power converter. These issues are often caused by parasitic near-field couplings which can degrade or bypass the attenuation of the EMI filter. This paper investigates how parasitic magnetic couplings impact the conducted noise of a high-frequency PFC converter using PCB-winding inductor. Analytical models are presented for both differential mode (DM) and common mode (CM) noise, including the effects of magnetic couplings between the PFC inductor and EMI filter. Then, three ferrite inductor core designs are evaluated to demonstrate how the core's geometry and permeability affect its leakage magnetic field. Choosing the optimal core design is shown to significantly reduce the magnetic field outside the PFC inductor, which reduces DM noise by more than 20 dB and reduces CM noise by 7 dB. © 2025 IEEE.

关键词： Magnetic levitation

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Small-Signal Analysis and External Ramp Design for Multiphase Current-Mode Constant On-Time Control with Phase Overlapping 14

Small-Signal Analysis and External Ramp Design for Multiphas...

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14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025

作者： Sridhar, Sundaramoorthy Li, Qiang Virginia Tech Center for Power Electronic Systems The Bradley Department of Electrical and Computer Engineering BlacksburgVA United States

ISBN: (纸本)9798331516116

High-current processor core voltage regulators (VRs) use current-mode constant on-time (COT) control to simplify phase interleaving and achieve high control bandwidth. Reducing VR bus voltage and increasing phase count results in steady-state phase overlapping within their operating duty range. With phase overlap, a smaller external ramp reduces the inner current loop stability margin and introduces large magnitude peaks in control-to-output response. These peaks could lead to double crossover, reduce gain margin, and make high-bandwidth outer voltage loop unstable in phase overlapping regions. Increasing the ramp damps these peaks and improves the gain margin but reduces the phase margin at the target bandwidth. Hence, this paper simplifies infinite-order describing function model and provides external ramp design guidelines to attain desired stability margin at the target bandwidth. The simplified model and small-signal analysis are validated using SIMPLIS simulation and experiments from a six-phase current-mode COT buck converter. © 2025 IEEE.

关键词： Image coding

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Electromechanical Wave Propagation for Disturbance Arrival Time Assessment in Power Systems

Electromechanical Wave Propagation for Disturbance Arrival T...

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IEEE General Meeting Power& Energy Society

作者： Somayeh Yarahmadi Pooja Algikar Lamine Mili Electrical and Computer Engineering Northern Virginia Center Virginia Tech

Rotor angle instability in a power system can yield cascading failures and, eventually, blackouts. In the literature, recent studies investigate the propagation pattern of the Electromechanical Waves (EMWs) throughout the transmission system produced by rotor angle deviations. Interestingly, they show that the EMWs propagate with a velocity much smaller than the speed of light. Consequently, the EMW arrival time to buses should be considered as one of the disturbance analysis criteria and accounted for in the design of the power system control. However, in these studies, the EMWs are modeled under the assumptions of a uniform distribution of the generator inertias, and the voltages, the length of lines, and the line parameters in the entire power system are respectively equal to each other. This paper relax some of these assumptions in that it analyzes the EMW propagation by considering a nonuniform distribution of the generators’ inertias throughout the transmission system while the generators’ internal reactances and line reactances are accounted for. Simulations performed on the New England 39-bus 10-Machine system revealed that the EMW velocity is significantly reduced when the generator reactances are accounted for when the inertia distribution is based on the line admittances. Also, it shows the dependency of the EMW propagation on the disturbance frequency.

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On the chronological understanding of the homogeneous dielectric barrier discharge

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High Voltage 2023年第6期8卷 1132-1150页

作者： Xinpei Lu Zhi Fang Dong Dai Tao Shao Feng Liu Cheng Zhang Dawei Liu Lanlan Nie Chunqi Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina College of Electrical Engineering and Control Science Nanjing Tech TechnologyNanjingChina School of Electric Power South China University of TechnologyGuangzhouChina Institute of Electrical Engineering Chinese Academy of SciencesBeijingChina Frank Reidy Research Center for Bioelectrics Old Dominion UniversityNorfolkVirginiaUSA Department of Electrical and Computer Engineering Old Dominion UniversityNorfolkVirginiaUSA

Dielectric barrier discharges(DBD)are widely utilised non‐equilibrium atmospheric pressure plasmas with a diverse range of applications,such as material processing,surface treatment,light sources,pollution control,and *** the course of several decades,extensive research has been dedicated to the generation of homogeneous DBD(H‐DBD),focussing on understanding the transition from H‐DBD to filamentary DBD and exploring strategies to create and sustain H‐*** paper first discusses the in-fluence of various parameters on DBD,including gas flow,dielectric material,surface conductivity,and mesh ***,a chronological literature review is presented,highlighting the development of H‐DBD and the associated understanding of its un-derlying *** encompasses the generation of H‐DBD in helium,nitrogen,and ***,the paper provides a brief overview of multiple‐current‐pulse(MCP)behaviours in H‐*** objective of this article is to provide a chronological un-derstanding of homogeneous dielectric barrier discharge(DBD).This understanding will aid in the design of new experiments aimed at better comprehending the mechanisms behind H‐DBD generation and ultimately assist in achieving large‐volume H‐DBD in an air environment.

关键词： dielectric barrier pollution

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H2/H∞ Robust Observed-State Feedback Control Based on Slack LMI-LQR for LCL-Filtered Inverters

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IEEE Transactions on Industrial Electronics 2023年第5期70卷 4785-4798页

作者： Tran, Thuy Vi Kim, Kyeong-Hwa Lai, Jih-Sheng Seoul National University of Science and Technology Department of Electrical and Information Engineering Research Center for Electrical and Information Technology Seoul01811 Korea Republic of Virginia Polytechnic Institute and State University Future Energy Electronics Center Department of Electrical and Computer Engineering BlacksburgVA24061 United States

A robust controller for an LCL-filtered grid-connected inverter (GCI) is presented in this article in the context of the system model uncertainties and nonideal grid environment. Under the occurrence of exogenous inputs from parameter drifts affecting the controller and observer, the H2/H∞ approach of the linear quadratic regulator control is developed to obtain the state-feedback gain and observer gain with the system stability guarantee by means of Lyapunov stability theory. Furthermore, the use of slack-linear matrix inequalities to handle parameter-dependent Lyapunov functions in synthesizing the robust controller can achieve a less conservative condition than the conventional quadratic stability. System robustness and stability are assessed through the closed-loop pole map and the discrete-time frequency analysis approaches. Hardware experiments are conducted for the LCL-filtered GCI to validate the feasibility and effectiveness of the proposed control method. Fair comparisons with the conventional schemes are also performed to highlight the superior performance of the proposed scheme. © 1982-2012 IEEE.

关键词： Stability criteria

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Parasitic Capacitance Analysis of Integrated Transformers with Parallel Windings

Parasitic Capacitance Analysis of Integrated Transformers wi...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Yuan, Tianlong Jin, Feng Li, Qiang Virginia Polytechnic and State University Center for Power Electronics Systems Bradley Department of Electrical and Computer Engineering Blacksburg United States

ISBN: (纸本)9798350376067

The electric transportation market has experienced rapid growth in recent years, driven by increasing environmental concerns. Resonant converters play a crucial role in this sector due to their ability to provide isolation and regulation functions with high efficiency. A resonant inductance embedded transformer is a critical component of the LLC resonant converter, significantly influencing the power density of the entire system, particularly in high-power applications. To achieve higher power density, the operating frequency often exceeds hundreds of kilohertz. At such high frequencies, parasitic capacitance cannot be ignored, as it may cause electromagnetic interference (EMI) issues. In high-power applications, integrated transformers with parallel windings are commonly used, adding complexity to the system. Measuring the parasitic capacitance of these transformers becomes increasingly challenging. This paper presents various measurement methods for an integrated transformer with parallel windings in a 30 kW LLC resonant converter. The results obtained from different measurement techniques were consistent with each other and with simulation results, validating the accuracy of the methods employed. © 2024 IEEE.

关键词： Resonant converters

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Analysis and Comparison of Integrated Planar Transformers for CLLC Resonant Converters

Analysis and Comparison of Integrated Planar Transformers fo...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Yuan, Tianlong Jin, Feng Yu, Gibum Li, Qiang Virginia Polytechnic and State University Center for Power Electronics Systems Bradley Department of Electrical and Computer Engineering Blacksburg United States

ISBN: (纸本)9798350376067

The advancement of electric vehicles and green energy technologies necessitates on-board chargers (OBCs) with higher power density and reduced costs. Integrated planar magnetics emerge as a highly competitive option due to their superior power density and ease of manufacturing compared to traditional magnetic designs. However, detailed flux analysis, particularly the distribution on the plate, remains essential for evaluating various transformer structures. This paper presents a comprehensive comparison of different core structures for integrated transformers, validated through an 11-kW CLLC resonant converter prototype with a 98.4% peak efficiency and 420 W/inch3 power density. © 2024 IEEE.

关键词： Resonant converters

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Modeling and Analysis of The Balance Network for Common Mode EMI Noise Suppression

Modeling and Analysis of The Balance Network for Common Mode...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Yang, Qiuzhe Wang, Shuo Li, Qiang Virginia Tech Center for Power Electronics Systems Bradley Department of Electrical and Computer Engineering BlacksburgVA24061 United States

ISBN: (纸本)9798350376067

This paper presents the model of the balance technique for common mode noise suppression. Considering the resonance due to the self-parasitic capacitance of the inductor in the balance network, coupling between the inductors is essential to compensate for the impact of self resonance. The derived model illustrates how the coupling coefficient affects the balance condition. To verify the model, three coupled inductors with different coupling coefficients are designed. A voltage-gain based method is proposed to simulate the real noise source in the balance network. And the voltage ratio between the balance bridges can be experimentally measured. The result matches the prediction very well and verifies the balance model. © 2024 IEEE.

关键词： Interference suppression

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