A Modular Approach to Electrical Storage & Conversion Angel V. - - PowerPoint PPT Presentation

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Mar 20, 2023 272 likes •354 views

A Modular Approach to Electrical Storage & Conversion Angel V. Peterchev, Ph.D. Department of Psychiatry & Behavioral Sciences Department of Biomedical Engineering Department of Electrical & Computer Engineering Duke University

SLIDE 1

Angel V. Peterchev, Ph.D.

Department of Psychiatry & Behavioral Sciences Department of Biomedical Engineering Department of Electrical & Computer Engineering Duke University

A Modular Approach to Electrical Storage & Conversion

SLIDE 2

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Battery Man- age- ment Inverter Ctrl Ctrl Controller Storage Battery Array

DC AC

Battery Cell Grid Micro-Grid Home

Battery Electrical Energy Storage: State-of-Art

…

Expensive transformers & filters
Expensive high-voltage components
Weakest link determines performance
Suboptimial efficiency

Angel V. Peterchev, Duke University

SLIDE 3

Battery Cell

…

Ctrl Battery Cell Controller Low- Voltage Switch

Novel Modular “AC Battery”

Novel Low-Voltage Module

No expensive transformers & filters
Cheap, low-voltage components
Optimial efficiency
Easy battery cell balancing
Fault tolerant/swappable modules
Easy system scalability

Grid Micro-Grid Home

Angel V. Peterchev, Duke University

SLIDE 4

Time Voltage Dynamic transition

Modular AC Battery Operation

Battery Cell Cap

Angel V. Peterchev, Duke University

SLIDE 5

AC Battery Prototype

8 module system
Storage per module

˃ lead-acid battery (12 V, 7 Ah) ˃ aluminum electrolytic capacitor (1 mF) ˃ low-impedance ceramic capacitor (200 µF)

Switch update rate = 30

kHz; average module switching frequency = 3.75 kHz

Angel V. Peterchev, Duke University [Goetz et al, Proc Appl Power Electron Conf & Expo 2016]

SLIDE 6

Output Quality & Balancing

High-quality output
Total harmonic distortion < 5%
–86 dB spurious-free dynamic

range

Excellent long-term balancing
Tested 5 hour operation with

variable load

Module voltage std. dev. < 77

mV (median = 22 mV)

Battery voltages (V) RMS load current (A) Time (min) Voltage (V), Current (A) Time (ms)

[Goetz et al, Proc Appl Power Electron Conf & Expo 2016] Angel V. Peterchev, Duke University

SLIDE 7

Acknowledgements

Duke Stefan Goetz Zhongxi Li Chuang Wang Chris Dougher Jeff Glass Jie Liu Charles Parker Seed funding by Duke University Energy Initiative NC State University Srdjan Lukic Xinyu Liang Chengduo Zhang