54 citations · 89 across the 13 of their papers we have counts for
13 papers
Challenges and Opportunities for Second-life Batteries: A Review of Key Technologies and Economy
Xubo Gu, Hanyu Bai, Xiaofan Cui +5
Due to the increasing volume of Electric Vehicles in automotive markets and the limited lifetime of onboard lithium-ion batteries (LIBs), the large-scale retirement of LIBs is immi…
Fast-Response Variable Frequency DC-DC Converters Using Switching Cycle Event-Driven Digital Control
Xiaofan Cui, Al-Thaddeus Avestruz
This paper investigates a new method to model and control variable-frequency power converters in a switching-synchronized sampled-state space for cycle-by-cycle digital control. Th…
A Unified Analytical Method to Quantify Three Types of Fast Frequency Response from Inverter-based Resources
Shuan Dong, Xin Fang, Jin Tan +3
With more inverter-based resources (IBRs), our power systems have lower frequency nadirs following N-1 contingencies, and undesired under-frequency load shedding (UFLS) can occur.…
Overcoming High Frequency Limitations of Current-Mode Control Using a Control Conditioning Approach -- Part II: Implementation and Hardware
Xiaofan Cui, Al-Thaddeus Avestruz
This article is the second part of a paper series about interference in extremum (i.e., peak or valley) current-mode control, which applies to both fixed and variable switching fre…
Overcoming High Frequency Limitations of Current-Mode Control Using a Control Conditioning Approach -- Part I: Modeling and Analysis
Xiaofan Cui, Al-Thaddeus Avestruz
Current-mode control is one of the most popular controller strategies for power converters. With the advent of wide bandgap devices including GaN and SiC, higher switching frequenc…
A Note on Low-Pass Filter Conditioning for Current-Mode Control
Xiaofan Cui, Al-Thaddeus Avestruz
The low-pass filter is a classic control conditioning approach for high-frequency current-mode control. However, no existing literature discusses the large-signal stability criteri…
A Note on Comparator-Overdrive-Delay Conditioning for Current-Mode Control
Xiaofan Cui, Guanyu Qian, Al-Thaddeus Avestruz
Comparator-overdrive-delay conditioning is a new control conditioning approach for high-frequency current-mode control. No existing literature rigorously studies the effect of the…
Large-Signal Stability Guarantees for Cycle-by-Cycle Controlled DC-DC Converters
Xiaofan Cui, Al-Thaddeus Avestruz
Stability guarantees are critical for cycle-by-cycle controlled dc-dc converters in consumer electronics and energy storage systems. Traditional stability analysis on cycle-by-cycl…
Lite-Sparse Hierarchical Partial Power Processing for Second-Use Battery Energy Storage Systems
Xiaofan Cui, Alireza Ramyar, Peyman Mohtat +4
The explosive growth of electric vehicles (EVs) is leading to a surge in retired EV batteries, which are typically recycled despite having nearly 80% available capacity. Repurposin…
Comparing Power Processing System Approaches in Second-Use Battery Energy Buffering for Electric Vehicle Charging
Xiaofan Cui, Alireza Ramyar, Jason Siegel +3
The heterogeneity in pack voltages and capacity of aged packs limits the performance and economic viability of second-use battery energy storage systems (2-BESS) due to issues of r…
Large-Signal Stability Criteria in DC Power Grids with Distributed-Controlled Converters and Constant Power Loads
Fangyuan Chang, Xiaofan Cui, Mengqi Wang +2
The increasing adoption of power electronic devices may lead to large disturbance and destabilization of future power systems. However, stability criteria are still an unsolved puz…
Singular Perturbation Theory for a Finite-Dimensional, Discrete-Time Chi Nonlinear System
Xiaofan Cui, Al-Thaddeus Avestruz
This paper develops the singular perturbation theory for a particular discrete-time nonlinear system which models the saturating inductor buck converter using cycle-by-cycle digita…
Correct-by-construction control synthesis for buck converters with event-triggered state measurement
Liren Yang, Xiaofan Cui, Al-Thaddeus Avestruz +1
In this paper, we illustrate a new correct-by-construction switching controller for a power converter with event-triggered measurements. The event-triggered measurement scheme is b…