Publications (27)
Distribution System Flexibility Characterization: A Network-Informed Data-Driven Approach
Qi Li, Jianzhe Liu, Bai Cui +2
A distribution system can flexibly adjust its substation-level power output by aggregating its local distributed energy resources (DERs). Due to DER and network constraints, charac…
Balancibility: Existence and Uniqueness of Power Flow Solutions under Voltage Balance Requirements
Bowen Li, Bai Cui, Feng Qiu +1
In distribution systems, power injection variability due to growing penetrations of distributed energy resources (DERs) and dispatchable loads can lead to power quality issues such…
Safe Reconnection Time for Large-Scale Data Center Loads: An Analytical Framework for Transient Stability Assessment
Ahmed Mesfer Alkhudaydi, Bai Cui
The rapid growth of large, power-electronics-rich data center (DC) loads is creating new operational challenges for bulk power systems. A key risk arises when a DC uninterruptible…
Managing Wildfire Risk and Promoting Equity through Optimal Configuration of Networked Microgrids
Sofia Taylor, Gabriela Setyawan, Bai Cui +2
As climate change increases the risk of large-scale wildfires, wildfire ignitions from electric power lines are a growing concern. To mitigate the wildfire ignition risk, many elec…
A Generalized LinDistFlow Model for Power Flow Analysis
Jianqiao Huang, Bai Cui, Xinyang Zhou +1
This paper proposes a new linear power flow model for distribution system with accurate voltage magnitude estimates. The new model can be seen as a generalization of LinDistFlow mo…
Robust Trajectory-Constrained Frequency Control for Microgrids Considering Model Linearization Error
Yichen Zhang, Chen Chen, Tianqi Hong +3
The capability to switch between grid-connected and islanded modes has promoted adoption of microgrid technology for powering remote locations. Stabilizing frequency during the isl…
A New Voltage Stability-Constrained Optimal Power Flow Model: Sufficient Condition, SOCP Representation, and Relaxation
Bai Cui, Xu Andy Sun
A simple characterization of the solvability of power flow equations is of great importance in the monitoring, control, and protection of power systems. In this paper, we introduce…
Day-Ahead Offering for Virtual Power Plants: A Stochastic Linear Programming Reformulation and Projected Subgradient Method
Weiqi Meng, Hongyi Li, Bai Cui
Virtual power plants (VPPs) are an emerging paradigm that aggregates distributed energy resources (DERs) for coordinated participation in power systems, including bidding as a sing…
Enabling Grid-Aware Market Participation of Aggregate Flexible Resources
Bai Cui, Ahmed Zamzam, Andrey Bernstein
Increasing integration of distributed energy resources (DERs) within distribution feeders provides unprecedented flexibility at the distribution-transmission interconnection. With…
DER Day-Ahead Offering: A Neural Network Column-and-Constraint Generation Approach
Weiqi Meng, Hongyi Li, Bai Cui
In the day-ahead energy market, the offering strategy of distributed energy resource (DER) aggregators must be submitted before the uncertainty realization in the form of price-qua…
Unified Sensitivity-Based Heuristic for Optimal Line Switching and Substation Reconfiguration
Zongqi Hu, Weiqi Meng, Bai Cui
Optimal transmission switching (OTS) determines which transmission lines to remove from service to minimize dispatch costs. Unlike topology design, it alters the operational status…
Network-Cognizant Time-Coupled Aggregate Flexibility of Distribution Systems Under Uncertainties
Bai Cui, Ahmed Zamzam, Andrey Bernstein
Increasing integration of distributed energy resources (DERs) within distribution feeders provides unprecedented flexibility at the distribution-transmission interconnection. To ex…
Counterexample to Equivalent Nodal Analysis for Voltage Stability Assessment
Bai Cui, Zhaoyu Wang
Existing literature claims that the L-index for voltage instability detection is inaccurate and proposes an improved index quantifying voltage stability through system equivalencin…
Incorporating energy storage and user experience in isolated microgrid dispatch using a multi-objective model
Yang Li, Zhen Yang, Dongbo Zhao +3
In order to coordinate multiple different scheduling objectives from the perspectives of economy, environment and users, a practical multi-objective dynamic optimal dispatch model…
Online Distribution System State Estimation via Stochastic Gradient Algorithm
Jianqiao Huang, Xinyang Zhou, Bai Cui
Distribution network operation is becoming more challenging because of the growing integration of intermittent and volatile distributed energy resources (DERs). This motivates the…
Solvability of Power Flow Equations Through Existence and Uniqueness of Complex Fixed Point
Bai Cui, Xu Andy Sun
Variations of loading level and changes in system topological property may cause the operating point of an electric power systems to move gradually towards the verge of its transmi…
Thermal conductivity reduction in (ZrTaNbTi)C high entropy carbide from extrinsic lattice defects
Cody A. Dennett, Zilong Hua, Eric Lang +2
High entropy carbides ceramics with randomly-distributed multiple principal cations have shown high temperature stability, low thermal conductivity, and possible radiation toleranc…
High-Fidelity Large-Signal Order Reduction Approach for Composite Load Model
Zixiao Ma, Zhaoyu Wang, Dongbo Zhao +1
With the increasing penetration of electronic loads and distributed energy resources (DERs), conventional load models cannot capture their dynamics. Therefore, a new comprehensive…
Optimal Power Flow for DC Networks with Robust Feasibility and Stability Guarantees
Jianzhe Liu, Bai Cui, Daniel K. Molzahn +3
With high penetrations of renewable generation and variable loads, there is significant uncertainty associated with power flows in DC networks such that stability and operational c…
Novel Region of Attraction Characterization for Control and Stabilization of Voltage Dynamics
Bai Cui, Ahmed Zamzam, Guido Cavraro +1
In this paper, we study the monitoring and control of long-term voltage stability considering load tap-changer (LTC) dynamics. We show that under generic conditions, the LTC dynami…
A Cycle-Based Solvability Condition for Real Power Flow Equations
Puskar Neupane, Bai Cui
Certifying power flow solvability is important for reliable power system operations under volatile operating conditions, but solving power flow equations repeatedly can be costly a…
Switching Device-Cognizant Sequential Distribution System Restoration
Anmar Arif, Bai Cui, Zhaoyu Wang
This paper presents an optimization framework for sequential reconfiguration using an assortment of switching devices and repair process in distribution system restoration. Compare…
Fault Diagnosis and Bad Data Detection of Power Transmission Network - A Time Domain Approach
Zhenyu Tan, Yu Liu, Hongbo Sun +1
Fault analysis and bad data are often processed in separate manners. In this paper it is proved that fault as well as bad current measurement data can be modeled as control failure…
Engineering Phonons in Compositionally Complex Carbide Ceramics
Linu Malakkal, Jarin C French, Lanh Trinh +6
In the pursuit of advanced ceramic materials with exceptional irradiation-resistance and high-temperature tolerance for nuclear applications, compositionally complex carbides (CCCs…
Optimizing DER Aggregate Flexibility via Network Reconfiguration
Feixiang Zhang, Hongyi Li, Bai Cui +1
The aggregate flexibility region of distributed energy resources (DERs) quantifies the aggregate power shaping capabilities of DERs. It characterizes the distribution network's pot…
A Wirtinger Power Flow Jacobian Singularity Condition for Voltage Stability in Converter-Rich Power Systems
Ahmed Mesfer Alkhudaydi, Bai Cui
The progression of modern power systems towards converter-rich operations calls for new models and analytics in steady-state voltage stability assessment. The classic modeling assu…
A Necessary Condition for Power Flow Insolvability in Power Distribution Systems with Distributed Generators
Zhaoyu Wang, Bai Cui, Jianhui Wang
This paper proposes a necessary condition for power flow insolvability in power distribution systems with distributed generators (DGs). We show that the proposed necessary conditio…