A Minimal Capacitor Modular Converter for Ultra-Dense Power Conversion

10.36227/techrxiv.15020040.v1 ◽

2021 ◽

Author(s):

Mahima Gupta

Keyword(s):

Low Frequency ◽

Design Feature ◽

Building Blocks ◽

Topology Design ◽

Power Electronic ◽

Density Reduction ◽

Weakest Link ◽

Ac Power ◽

Detailed Simulation ◽

Modular Converter

<div>Modular multilevel power electronic converters are considered an increasingly critical family of converters for myriad high voltage high power applications. With the ever-growing emphasis on electrification of the economy, they play a crucial role in serving energy sources and loads whose electrical ratings go beyond the ratings of the conventional power electronic building blocks. In particular, modular multilevel converter (MMC) topology enjoy its dominance in such applications due to modularity, scalability, performance and fault-tolerance capability. However, the MMC topology design imposes low-frequency ac components on the module capacitors and thus is inhibited by the capacitor size. Capacitor sizing plays a significant role in the overall system’s size, cost and reliability. This paper introduces a minimal capacitor module based topology for DC to three-phase AC conversion. The unique design feature of the module includes minimal capacitor requirement due to elimination of single-phase ac power processing requirements. Together with improved power density, reduction of capacitor size permits the use of only film capacitors thus eliminating the weakest link of the overall system. Along with the step-by-step analytical derivation of the proposed approach, the paper presents detailed simulation studies, comparative analysis and experimental results from a proof-of-concept laboratory-scale prototype.</div>

Download Full-text

Scaling the controllable network transformer (CNT) to utility-level voltages with direct AC/AC power electronic building blocks (PEBBs)

2013 IEEE Energy Conversion Congress and Exposition ◽

10.1109/ecce.2013.6647099 ◽

2013 ◽

Cited By ~ 4

Author(s):

Amrit R. Iyer ◽

Prasad Rajendra Kandula ◽

Rohit Moghe ◽

Frank C. Lambert ◽

Deepak M. Divan

Keyword(s):

Building Blocks ◽

Power Electronic ◽

Utility Level ◽

Ac Power

Download Full-text

Multi-Stranded Coronal Loops: Quantifying Strand Number and Heating Frequency from Simulated Solar Dynamics Observatory (SDO) Atmospheric Imaging Assembly (AIA) Observations

Solar Physics ◽

10.1007/s11207-021-01848-8 ◽

2021 ◽

Vol 296 (6) ◽

Author(s):

Thomas Williams ◽

Robert W. Walsh ◽

Stephane Regnier ◽

Craig D. Johnston

Keyword(s):

Energy Content ◽

Time Lag ◽

Low Frequency ◽

Building Blocks ◽

Coronal Loops ◽

Loop Model ◽

Solar Dynamics Observatory ◽

Heat Deposition ◽

Total Energy Content ◽

Solar Dynamics

AbstractCoronal loops form the basic building blocks of the magnetically closed solar corona yet much is still to be determined concerning their possible fine-scale structuring and the rate of heat deposition within them. Using an improved multi-stranded loop model to better approximate the numerically challenging transition region, this article examines synthetic NASA Solar Dynamics Observatory’s (SDO) Atmospheric Imaging Assembly (AIA) emission simulated in response to a series of prescribed spatially and temporally random, impulsive and localised heating events across numerous sub-loop elements with a strong weighting towards the base of the structure: the nanoflare heating scenario. The total number of strands and nanoflare repetition times is varied systematically in such a way that the total energy content remains approximately constant across all the cases analysed. Repeated time-lag detection during an emission time series provides a good approximation for the nanoflare repetition time for low-frequency heating. Furthermore, using a combination of AIA 171/193 and 193/211 channel ratios in combination with spectroscopic determination of the standard deviation of the loop-apex temperature over several hours alongside simulations from the outlined multi-stranded loop model, it is demonstrated that both the imposed heating rate and number of strands can be realised.

Download Full-text

Resonant controllers with three-degree of freedom for AC power electronic converters

2014 IEEE Energy Conversion Congress and Exposition (ECCE) ◽

10.1109/ecce.2014.6953618 ◽

2014 ◽

Author(s):

A. Lidozzi ◽

L. Solero ◽

F. Crescimbini ◽

M. Di Benedetto ◽

S. Bifaretti

Keyword(s):

Degree Of Freedom ◽

Power Electronic ◽

Power Electronic Converters ◽

Ac Power ◽

Three Degree Of Freedom

Download Full-text

Modified T-type Three-level AC-DC Converter Based Multi-functional Compensator for Three-phase AC Power System with Low Frequency Pulsed Load

IEEE Transactions on Industrial Electronics ◽

10.1109/tie.2021.3130322 ◽

2021 ◽

pp. 1-1

Author(s):

Jianxin Zhu ◽

Hongfei Wu ◽

Lin Li ◽

Jiangfeng Wang ◽

Ming Hua ◽

...

Keyword(s):

Power System ◽

Low Frequency ◽

Ac Power ◽

Three Phase

Download Full-text

Design of a Low Inductance Power Module Based on Low Temperature Co-fired Ceramic

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/2016cicmt-tp2a1 ◽

2016 ◽

Vol 2016 (CICMT) ◽

pp. 000032-000038

Author(s):

Atanu Dutta ◽

Simon S. Ang

Keyword(s):

Low Temperature ◽

Coefficient Of Thermal Expansion ◽

Semiconductor Devices ◽

Building Blocks ◽

Wide Bandgap ◽

Switching Frequency ◽

Full Potential ◽

Power Electronic ◽

Power Module ◽

Parasitic Inductance

Abstract Efficient, compact, and reliable power electronic modules are building blocks of modern day power electronic systems. In recent times, wide bandgap semiconductor devices, such as, silicon carbide (SiC) and gallium nitride (GaN), are widely investigated and used in the power electronic modules to realize power dense, highly efficient, and fast switching modules for various applications. For high power applications is it required to parallel and series several devices to achieve high current and high voltage specifications, which results in larger current conducting traces. One of the major obstacles in using these wideband gap power semiconductor devices are the internal module stray inductance that is associated with these current conducting traces. With increasing demand for higher switching frequency, the internal module parasitic inductance must be reduced to as minimum as possible in order to utilize the full potential of the wide bandgap devices. A multi-layer approach of low-temperature co-fired ceramic (LTCC) to package the wide bandgap devices is investigated. The multi-layer design freedom by using LTCC can be utilized to reduce the footprint of the overall power module, electrical interconnects, hence, reducing the package parasitic inductance. LTCC also facilitates high temperature operations and has a coefficient of thermal expansion matching with wide bandgap devices. In this paper, we report on a LTCC based power module design where LTCC is utilized as an isolation layer between the source and the drain of the power devices. A simulation based parasitic inductance analysis and electro-thermal-mechanical study is performed using ANSYS Workbench Tools to investigate the feasibility of this LTCC based design.

Download Full-text

Piezoelectric Nanogenerators for Mechanical Energy Harvesting

International Symposium on Microelectronics ◽

10.4071/isom-2011-tp5-paper3 ◽

2011 ◽

Vol 2011 (1) ◽

pp. 000367-000375

Author(s):

Xudong Wang

Keyword(s):

Energy Harvesting ◽

Mechanical Energy ◽

External Disturbance ◽

Low Frequency ◽

Life Time ◽

Building Blocks ◽

Metal Electrode ◽

Ultrasonic Waves ◽

Piezoelectric Potential ◽

Piezoelectric Thin Film

Piezoelectric ZnO nanowires (NWs) have recently been demonstrated as a promising concept to harvest micro- and nano-scale mechanical energy from the surroundings. It is named nanogenerator. The operation principle relies on the bending of NWs by an external disturbance which creates piezoelectric potential along the deformed surfaces. The piezoelectric potential was predicted to be hundreds of milivolts per NW and the optimal power output per NW could reach a few nanowatts when it is under resonant oscillation. The first nanogenerator prototype was fabricated with vertically aligned ZnO NW arrays that were placed beneath a zigzag-shaped metal electrode with a small gap. In this design, all the NWs can be actuated simultaneously and continuously by ultrasonic waves, leading to the production of a continuous DC current. A textile fiber based nanogenerator has been developed for harvesting low-frequency vibration/friction energies. A piezoelectric thin film based nanogenerator was demonstrated to convert low-speed wind energy into electricity through the stimulated oscillation. These devices have the potential to fundamentally improve the mechanical energy harvesting capability with advanced nanostructure building blocks and compact designs, which might eventually lead to an effective power source for self-powered electronic systems with higher energy density, higher efficiency, longer life time, as well as lower cost.

Download Full-text

Design and Analysis of Two Piezoelectric Cymbal Transducers with Metal Ring and Add Mass

Sensors ◽

10.3390/s19010137 ◽

2019 ◽

Vol 19 (1) ◽

pp. 137 ◽

Cited By ~ 2

Author(s):

Wenjie Wang ◽

Weihao Shi ◽

Peter Thomas ◽

Mingsui Yang

Keyword(s):

Simulation Analysis ◽

Low Frequency ◽

High Strength ◽

Structural Parameter ◽

Metal Ring ◽

Cavity Structure ◽

Good Consistency ◽

Frequency Transducer ◽

Detailed Simulation ◽

Transducer Design

Based on traditional sandwich structure, two piezoelectric transducers were designed to meet the strict underwater application backgrounds such as high pressure, corrosion resistance, and high strength. Both transducers integrated most of previous researches while one transducer has a multilayer cavity structure which is different from the other structure and previous transducer structures. After a detailed simulation analysis of every structural parameter, key parameters were pointed out to have an obvious influence on its performance. Then, two models were constructed and compared with chosen sets of geometry parameters and manufacturing process, which can also provide a reference for low-frequency transducer design. The simulation results and experimental results of our transducers show a good consistency which indicates the cavity structure can reduce the resonance frequency.

Download Full-text