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Switching Modulation Optimization for Efficiency Maximization in a Single-Stage Series Resonant DAB-Based DC-AC Converter

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2023年第5期11卷 5454-5469页

作者： Morsali, Payam Dey, Saikat Mallik, Ayan Akturk, Akin Arizona State Univ Power Elect & Control Engn Lab PEACE Mesa AZ 85287 USA Arizona State Univ Ira A Fulton Sch Engn Mesa AZ 85287 USA CoolCAD Elect LLC College Pk MD USA

This article presents a novel design and loss optimization technique for a single-stage dc-ac series resonant dual active bridge (SR-DAB) converter by considering an all-harmonic-inclusive general harmonic approximation (GHA)-oriented converter model. The proposed work considers the design level optimization of an SR-DAB and its control-based optimization by employing a simplified mathematical approach to obtain the LC-tank instantaneous and rms currents. Also, the zero-voltage-switching (ZVS) range of operation is vastly improved by applying the GHA model. A series of comparisons in terms of dc-ac rms currents, ZVS region, and turn-off current of all transistors are conducted at different loads and different modulation techniques to prove the advantage of the proposed optimized design and control optimizations over the traditional DAB-based dc-ac converters. Finally, a gallium nitride (GaN)-/silicon carbide (SiC)-based hardware prototype to connect a 40-V/500-W solar panel to the 120- V-rms ac grid is developed, and a quantitative comparison of the efficiencies at different modulation strategies for standard DAB and SR-DAB is presented where the proposed design using advanced triple-phase-shift (ATPS) modulation exhibits a peak efficiency of 95.8% for the SR-DAB.

关键词： Modulation Optimization Inductors Bridge circuits Switches Mathematical models Impedance DC-AC converter design optimization dual active bridge (DAB) fixed-frequency isolated converters low current stress optimized inductor current series resonant dual active bridge (SR-DAB) single-stage converter triple-phase-shift (TPS)

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A Simple and Effective Open-Circuit-Fault Diagnosis Method for Grid-Tied Power Convertersu-A New Technique Based on Tellegens Theorem

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2023年第2期11卷 2203-2213页

作者： Zhang, Mingyuan Zhang, Zhenbin Li, Zhen Wang, Jinyu Zhang, Yongfeng Liu, Shiming Shandong Univ Sch Elect Engn Jinan 250061 Peoples R China Xi An Jiao Tong Univ Sch Elect Engn Xian 710049 Peoples R China Univ Jinan Sch Elect Engn Jinan 250024 Peoples R China

Grid-tied power converters are widely adopted in renewable energy integration systems. Reliable operation of such power converters is highly desirable, which relies on effective fault diagnosis and ride-through techniques. In this work, we propose a new open-circuit fault diagnosis method for grid-tied power converters based on Tellegen's theorem, which is fast in fault detection and accurate in faulty component location. We first developed a "quasi-power" concept to define the relationship between current and voltage magnitudes for the underlying power converter. The value of the afore-developed quasi-power in this proposal depends solely on the connection state (i.e., the switch position and status) of a power converter, resulting in its good features of robustness to parameter variations and immunity to operation changes. Thereafter, we propose a fault diagnosis method based on the quasi-power of a converter, which is able to identify any faulty component among all the semiconductor switches (i.e., the insulated gate bipolar translators (IGBTs) and freewheeling diodes) at a time-scale of only one sampling period. As a case study, the proposed technique is incorporated into a well-known model predictive control (MPC) framework of a grid-tied two-level (2L) power converter and tested at a lab-constructed test bench. Experimental results confirm its effectiveness.

关键词： Circuit faults Fault diagnosis Switches Switching circuits Power electronics Insulated gate bipolar transistors Voltage Fault diagnosis grid-tied power converters open-circuit fault Tellegen's theorem

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A Common-Grounded Single-Phase AC/Bipolar DC Hybrid Microgrid With a Four-Leg Interlinking Converter

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2023年第5期11卷 5337-5353页

作者： Naghizadeh, Mohadeseh Hojabri, Hossein Muljadi, Eduard Shahid Bahonar Univ Kerman Dept Elect Engn Kerman *** Iran Auburn Univ Dept Elect & Comp Engn Auburn AL 36849 USA

Hybrid microgrids (HMGs) are more flexible and require fewer power converters than ac and dc microgrids (MGs);however, the number of wires/buses in HMGs is still considerable, especially when there are multiple voltage levels in the dc subgrid. There are five wires/buses in conventional single-phase ac/bipolar dc (BDC) HMGs, two (phase and neutral) in the ac subgrid, and three (positive, zero, and negative) in the BDC subgrid. This article presents a new four-wire architecture with a common zero and neutral bus for a single-phase ac/BDC HMG that features a new bidirectional interlinking converter (IC). Using the proposed structure, the number of wires/buses and total costs are reduced without increasing the number of IC switches or complicating its control method. Besides, the common zero and neutral bus in the proposed structure provides proper grounding for both subgrids, reduces leakage current (approximate to 0 mA), and improves fault tolerability in dc fault conditions. For this purpose, the dc-side fault ride-through (FRT) capabilities of the conventional and proposed ICs are compared by driving their mathematical models under dc fault conditions. The most severe currents experienced by conventional IC switches in a resistive grounded system are 760 A under positive and 1300 A under negative and zero terminal-to-ground (ZG) fault conditions. However, the proposed IC does not experience any overcurrent in ZG fault conditions, and its switches' current stresses are reduced to 170 A for positive and 320 A for negative terminal-to-ground fault conditions. To validate the performance of the proposed IC and its modulation technique, simulation results in PSCAD/EMTDC environment and experimental results based on a scaled-down prototype are presented.

关键词： Integrated circuits Microgrids Costs Grounding Leakage currents Transformers Topology 3-D space vector modulation fault tolerability four-leg interlinking converter (IC) grounding leakage current single-phase ac/bipolar dc (BDC) hybrid microgrid (HMG)

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A Self-Tuning Adaptive Control Scheme for a Grid-Connected Three-Phase PV System

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2022年第5期10卷 5709-5716页

作者： Bhunia, Malay Subudhi, Bidyadhar NIT Rourkela Elect Engn Dept Rourkela 769008 India Indian Inst Technol Goa Sch Elect Sci Ponda 403401 Goa India

This article presents a new self-tuning sinusoidal recursive controller (STSRC) for handling the uncertainties and disturbances in a three-phase grid-connected photovoltaic system (GCPVS). The performance of a GCPVS is greatly influenced by the uncertainties, such as intermittency in solar irradiation, change in capacitance and equivalent series resistance (ESR) of dc-link capacitor, and variation of impedance between the inverter and the grid. This STSRC comprises improved linear sinusoidal tracer-based recursive least-square estimation (IRLS) to achieve robust performances, despite the parametric uncertainties through real-time estimation of its parameters, and updation of its gains. The efficacy of the proposed STSRC is verified through simulation using MATLAB/Simulink and experimental studies pursued on a 2.5-kW prototype. It is observed that STSRC exhibits superior tracking of PV voltage with reduced ripple and improved grid current with reduced total harmonic distortion (THD) of 1.66%. The estimation accuracy is found above 92%.

关键词： Estimation Uncertainty Power harmonic filters Inverters Capacitors Covariance matrices Integrated circuits Adaptive control photovoltaic (PV) system recursive least-square estimation (RLS) sinusoidal tracer

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High-Frequency-Linked Three-Port Converter With Optimized Control Strategies Based on Power System Load Flow Concepts for PV-Battery systems

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2022年第1期10卷 1032-1045页

作者： Haque, Md Mejbaul Wolfs, Peter J. Alahakoon, Sanath Blaabjerg, Frede Cent Queensland Univ Sch Engn & Technol Rockhampton Qld 4701 Australia Aalborg Univ Dept Energy Technol DK-9220 Aalborg Denmark

This article proposes an optimized modulation and control strategy for high-frequency-linked three-port converters (HFL-TPCs), which is conceptually derived from the generalized load flow equations of a typical power system. The power system analogy explains why single phase shift (SPS) modulation results in higher reactive currents that reduce the overall converter efficiency. The SPS converter also loses zero-voltage switching (ZVS) at lower power operations. The proposed optimized quintuple phase shift (QPS) modulation method allows dynamic control of duty cycles of the HF square wave voltages that potentially control the real and reactive power flows of the HFL-TPC. The QPS modulation phase variables are applied to derive the generalized models of the HFL-TPC using a harmonic analysis approach. Harmonic analysis and the optimized modulation strategy greatly simplify the theoretical analysis of the HFL-TPC compared to a piecewise time-domain approach. A detailed power loss model of the HFL-TPC is also discussed. To verify the practical feasibility of the proposed optimized modulation strategies, a 60-V, 400-W HFL-TPC is built and tested. Simulation and experimental results show that the proposed modulation method reduces reactive power, improves efficiency, and maintains the ZVS operation over a wide voltage and power range.

关键词： Phase modulation Zero voltage switching Bridge circuits Load flow Power systems High frequency Analytical models Converter efficiency harmonic analysis optimized quintuple phase shift (QPS) modulation reactive power minimization zero-voltage switching (ZVS)

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Design of Efficient AI Accelerator Building Blocks in Quantum-Dot Cellular Automata (QCA)

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ieee journal on emerging and selected topics in circuits and systems 2022年第3期12卷 703-712页

作者： Mamdouh, Ahmed Mjema, Mbonea Yemiscioglu, Gurtac Kondo, Satoshi Muhtaroglu, Ali Middle East Tech Univ Dept Elect & Elect Engn Northern Cyprus Campus TR-99738 Kalkanli Gtizelyurt Turkey Middle East Tech Univ Ctr Sustainabil Northern Cyprus Campus TR-99738 Kalkanli Gtizelyurt Turkey Middle East Tech Univ Math Res & Teaching Grp Northern Cyprus Campus TR-99738 Kalkanli Gtizelyurt Turkey

Digital circuit design technologies based on Quantum-Dot Cellular Automata (QCA) have many advantages over CMOS, such as higher intrinsic switching speed up to Terahertz, lower power consumption, smaller circuit footprint, and higher throughput due to compatibility of the inherent signal propagation scheme with pipelining. Hence, QCA is a perfect candidate to provide a circuit design framework for applications such as Artificial Intelligence (AI) accelerators, where real-time energy-efficient performance needs to he delivered at low cost. A novel QCA design approach based on optimal mix of Majority and NAND-NOR-INVERTER (NNI) gates with USE (Universal, Scalable, Efficient) clocking scheme, has been investigated in this work for latency and energy consumption improvements to fundamental building blocks in AI-accelerators, including multipliers, adders, accumulators and SRAMs. The common 4 x 4 Vedic multiplier has been redesigned using the proposed approach, and simulated to yield 62.8% reduction in cell count, 82.2% reduction in area, and 71.2% reduction in latency. 83% reduction in cell count, 94.5% reduction in area, and 94.6% reduction in latency was simulated for the proposed 8-bit PIPO register. The proposed SRAM cell design is estimated to have similar improvement figures to those achieved by the sub-blocks, such as the D-Latch, which has been simulated to exhibit 44.4% reduction in cell count, 50% reduction in both area and latency, and 73% reduction in energy dissipation. The contributions from this work can be directly applied to low cost, high throughput, energy efficient AI-accelerators that can potentially deliver orders of magnitude better energy-delay characteristics than their CMOS counterparts, and significantly better energy-delay characteristics than state-of-the-art QCA implementations.

关键词： Quantum cellular automata quantum-dots nanotechnology integrated circuits Al accelerators SRAM

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How to Feed a Growing Population-An IoT Approach to Crop Health and Growth

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ieee journal on emerging and selected topics in circuits and systems 2021年第3期11卷 435-448页

作者： Grimblatt, Victor Jego, Christophe Ferre, Guillaume Rivet, Francois Synopsys Santiago 7630635 Chile Univ Bordeaux IMS Lab F-33076 Bordeaux France

Humankind consumes the planet's resources beyond what the Earth can provide with estimations according 9.2 billion human beings in 2050 consuming yearly almost twice the resources the Earth can provide. Crop production needs to increase by 70% to be able to feed all the population. A convenient way to address this issue is to produce efficiently respecting the planet. Non-invasive technology at a low cost is a solution to monitor crop growth and health, helping small to medium farmers to increase their productivity keeping in mind the conservation of the planet. circuits and systems offer large range of possibilities. We propose to investigate IoT with medium cost sensors to deliver real time, affordable and precise data processing for agriculture producing an Automated Decision-Making systems (ADMS). This paper is a detailed analysis of plant parameters, sensors and their compatibility with affordable ADMS based IoT systems. Some experimentation of critical parameters show their impacts for plant growth and health. An overview of an IoT system under development is introduced.

关键词： Agriculture Sensors Internet of Things Soil Sensor systems Plants (biology) circuits and systems IoT ADMS environment sensing precise agriculture plant growth sensors

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Editorial Introduction to JSTQE Issue on High Density Integrated Multipurpose Photonic circuits

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ieee journal OF selected topics IN QUANTUM ELECTRONICS 2023年第6期29卷

作者： Perez-Lopez, Daniel Zhuang, Leimeng Tait, Alex Guo-Qiang, Lo Patrick Ipron Programmable Photon SL Valencia Spain Intel Corp Mountain View CA USA S Univ Queen&x0027 Kingston ON Canada Adv Micro Foundry Singapore Singapore

The papers in this special section focus on high density integrated multipurpose photonic circuits. The growing maturity of integrated photonic technology makes it possible to build increasingly large and complex photonic circuits on the surface of a chip, enabling a generation of photonic circuits that can be programmed using software for a wide variety of functions. Programmability and reconfigurability in photonic integrated circuits allow both multipurpose devices and systems with unprecedent adaptability and flexibility. This emerging field is one of the fastest-growing fields in photonics with applications including optical signal processing, computing and quantum photonics.

关键词： Special issues and sections Photonic integrated circuits Integrated circuits Optical signal processing Quantum computing Photonics

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Guest Editorial Introduction to the Special Section on the 2023 RFIC Symposium

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ieee journal OF SOLID-STATE circuits 2024年第5期59卷 1300-1300页

作者： Okada, Kenichi Tokyo Inst Technol Elect & Elect Engn Tokyo 1528550 Japan

This special section of the ieee journal of Solid-State circuits presents the expanded versions of selected articles presented at the 2023 Radio Frequency Integrated circuits Symposium (RFIC) held in San Diego, CA, USA, during June 11-13, 2023. The RFIC Symposium is the world's premier conference focused on RF and millimeter-wave (mmWave) integrated circuits and systems technology. In addition to showcasing state-of-the-art high-frequency IC design techniques, the conference has evolved to encompass a wide range of emerging technologies and applications, including wireless/wireline communication, cryogenic technology, and other innovations in RF, millimeter-wave, terahertz-wave, and analog/mixed-signal ICs. The collection of papers in this special Section reflects the diversity and multidisciplinary nature of the RFIC Symposium.

关键词： Special issues and sections Meetings Radiofrequency integrated circuits

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Quantitative Modeling and Analysis of Switching Oscillations of Cascode GaN Devices in Half-Bridge Converters

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2022年第5期10卷 5446-5463页

作者： Luo, Bin Luo, Guangzhao Li, Sihai Northwestern Polytech Univ Sch Automat Xian 710060 Peoples R China

Having high efficiency and power density, the motor drives based on wide bandgap (WBG) devices can better meet the requirements for developing more electric aircraft (MEA). However, the fast switching characteristic of gallium nitride (GaN) devices has led to undesirable voltage and current oscillations during turn-ON and turn-OFF processes, thus decreasing the reliability of the electric drive system. The complicated structure of cascode GaN devices and various parasitic parameters in the device and the half-bridge converter make the switching oscillation modeling of cascode GaN device comparatively complex. In this article, an equivalent circuit approach in consideration of nonlinear characteristics in voltage-dependent junction capacitances is presented to model the switching oscillation for high-voltage (650 V) cascode GaN-based half-bridge converters. Quantitative mathematical models are derived to provide a theoretical analysis of the switching oscillation for turn-on and turn-off processes of cascode GaN devices. Furthermore, the influences of device and circuit parameters on the oscillation are investigated in detail, offering a reliable guidance to the gate driver and print circuit board design. Finally, experimental studies on the basis of cascode GaN and custom cascodes are carried out to validate the modeling approach. The results have proved that one of the root causes of the oscillations is how the different parasitics interact.

关键词： Oscillators Gallium nitride Switches Logic gates Voltage Capacitors Switching circuits Bridge converter equivalent circuits gallium nitride (GaN) devices parasitic parameters switching oscillation

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