Article
Mathematics, Applied
David Juher, David Rojas, Joan Saldana
Summary: This paper examines the bifurcations of limit cycles in an epidemic model with two types of aware individuals. The alerting decay rate and the rate of creation of aware individuals in the model are nonlinearly dependent on the disease prevalence, while all other transition rates remain constant. The study uses numerical computation and the Poincare map to analyze the stability of the limit cycles in the ODE model, and also establishes conditions for the existence of an endemic equilibrium. Stochastic simulations are conducted to confirm the bistability scenarios observed in the ODE model solutions under a very low rate of imported cases.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Mathematics, Applied
Nicola Vassena
Summary: Motivated by investigating multistationarity in biochemical systems, this paper addresses saddle-node bifurcations for chemical reaction networks with general kinetics. The authors identify structural network conditions that guarantee the bifurcation behavior and develop a method to identify the proper bifurcation parameters. Specific bifurcation parameters for Michaelis-Menten and Hill kinetics are explicitly provided. Examples of applications include reversible feedback cycles, the central carbon metabolism of Escherichia coli, and autocatalytic networks.
SIAM JOURNAL ON APPLIED DYNAMICAL SYSTEMS
(2023)
Article
Computer Science, Artificial Intelligence
Debanjan Mukherjee, Sourav Mallick, Abhishek Rajan
Summary: Most practical engineering optimization problems are highly nonlinear and nonconvex, making it difficult for traditional optimization techniques to find optimal solutions. Population-based meta-heuristic techniques have gained popularity for their ability to handle the nature of these problems. A new Levy Flight based Adaptive Particle Swarm Optimization technique is proposed to overcome these challenges and is shown to outperform other PSO variants in various tests.
APPLIED SOFT COMPUTING
(2022)
Article
Mathematics, Applied
Hebai Chen, Yilei Tang, Dongmei Xiao
Summary: In this paper, a quintic Lienard system was studied, showing that the system exhibits at most two limit cycles in the saddle case. Necessary and sufficient conditions were obtained for the existence of two limit cycles and a two-saddle heteroclinic loop. The study included a global bifurcation diagram and various bifurcation types such as Hopf, Bautin, two-saddle heteroclinic loop, and double limit cycles.
Proceedings Paper
Computer Science, Theory & Methods
Katharina Kaiser, Johanna Vorwerk, Marc Hohmann, Stavros Karagiannopoulos, Fabian Streiff, Gabriela Hug
Summary: This paper investigates the lower bound of steady-state voltage stability protection for power systems. An iterative method is proposed to determine the optimal lower voltage bound by tracing the transfer limit surface to increase the minimum voltage magnitude at the maximum loading point.
2023 IEEE BELGRADE POWERTECH
(2023)
Article
Automation & Control Systems
Debanjan Mukherjee, Sourav Mallick
Summary: To cope with the increasing load demand, the system needs to run at the maximum loading level without compromising its security limits. The Static Synchronous Series Compensator (SSSC) is preferred among existing FACTS devices to further increase the system-MLL. The SSSC parameters are optimized and validated using a dynamic model in MATLAB/SIMULINK. The research also focuses on improving the efficiency of the PV-SSSC through MPPT and FAO techniques.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2023)
Article
Mathematics, Applied
Yidan Wang, Zhouchao Wei, Haozhe Liu, Wei Zhang
Summary: This paper investigates the global dynamics of node-saddle piecewise linear refracted systems with a linear separation line, focusing on the behavior of homogeneous orbits, limit cycles, and other phenomena arising from non-smooth properties. The main results include the existence and stability of limit cycles and homoclinic orbits in bounded areas, as well as a qualitative proposition of equilibria at infinity using the Lienard canonical form. Finally, a schematic representation of the possibilities of all topologically inequivalent global phase portraits is provided using the Poincare disc.
DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES S
(2023)
Article
Engineering, Electrical & Electronic
Sina Hashemi, Hamid Lesani, Mohammad Reza Aghamohammadi
Summary: The paper proposes an integrated approach for determining adaptive settings for network controlling equipment with the aim of ensuring maximum loadability limit incorporated into the minimization of total operating cost.
ELECTRICAL ENGINEERING
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Jayanta Piri, Gautam Bandyopadhyay, Mainak Sengupta
Summary: In today's deregulated electric power systems, both government and private utilities participate in the generation, transmission, and distribution sectors. The ownership of each sector may belong to different agencies or companies. The strength of a transmission system, which evacuates power from generating stations and supplies it to different load points, is crucial for ensuring adequate power supply. Loadability studies, which maximize the system load without violating operating constraints, play an important role in planning a power system. A new search algorithm has been proposed in this study to calculate the loadability of a transmission system and determine its maximum loadability.
2023 INTERNATIONAL CONFERENCE ON COMPUTER, ELECTRICAL & COMMUNICATION ENGINEERING, ICCECE
(2023)
Article
Engineering, Electrical & Electronic
Suprovat Ghosh, Suchismita Tewari, Abhijit Biswas, Amlan Chakrabarti
Summary: This paper reports on unique InGaAs-based ISFET sensor devices with a sensing gate and traditional floating gate, using different barrier materials. Among them, the single barrier sensor device shows the highest threshold voltage sensitivity and I-ON/I-OFF ratio sensitivity, surpassing the conventional Nernst limit.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Computer Science, Information Systems
Zhongyan Xu, Shengyu Tao, Hongtao Fan, Jie Sun, Yaojie Sun
Summary: This study proposes a power limit control strategy to coordinate the MPPT algorithm and BES accessibility, which directly controls the inverter output current according to power limit instructions from electric operation control centers.
Article
Engineering, Electrical & Electronic
Jingxi Yang, Chi K. Tse, Meng Huang, Dong Liu
Summary: This paper investigates the interaction between grid-following rectifiers and the grid in modern power systems, identifying three routes to voltage instability and reporting the occurrence of supercritical Hopf bifurcation, successive saddle-node bifurcation of periodic orbits, subcritical Hopf bifurcation, and departure from a stable basin of attraction. The current loop of the rectifier plays a crucial role in these bifurcation behaviors. It is recommended to increase the bandwidth of the current loop to trigger Bautin bifurcation and avoid subcritical Hopf bifurcation for voltage stability.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Shota Omi, Yasuyuki Shirai
Summary: This research proposes a robust calculation method for Voltage Stability Margin (VSM) based on the optimal power flow direct method. Results from evaluation on various power systems show that the proposed method can calculate VSM more reliably compared to conventional methods.
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING
(2021)
Article
Energy & Fuels
Sharmistha Nandi, Sriparna Roy Ghatak, Parimal Acharjee, Fernando Lopes
Summary: Due to the increasing number of electric vehicle charging stations and additional power consumption, the overall power system performance suffers, leading to voltage profile degradation, stability reduction, increased losses, and the possibility of voltage collapse. To address these problems, unique formulae like the maximum load multiplier and practical load multiplier have been developed to consider line resistance. These formulae enable quick assessment of suitable capacities and the number of electric vehicles that can be charged simultaneously in the charging station. The proposed technique is simple, computationally inexpensive, and applicable to both transmission and distribution systems.
Proceedings Paper
Energy & Fuels
Pierre O. Dorile, Daniel R. Jagessar, Lizbeth Guardado, Roy A. McCann, Mojtaba Ahanch
Summary: With the threat of climate change, a significant amount of renewable energy sources are being integrated into traditional transmission grids, with wind energy being the fastest growing. The operation and planning of these grids with large wind farms pose challenges to operators and planners, requiring a systematic approach for integration. This study presents an iterative QV modal analysis to determine the strength of each region of the power system and the maximum loadability of each region, using methodologies applied to the IEEE 14 bus system with a large wind farm.
2021 IEEE PES/IAS POWERAFRICA CONFERENCE
(2021)
Review
Engineering, Multidisciplinary
Antonio J. Conejo, Xuan Wu
Summary: This paper provides a tutorial overview of robust optimization in power systems, including robust optimization, adaptive robust optimization, and distributionally robust optimization. The paper also describes and analyzes short-term operation problems and long-term planning problems to illustrate the applications of these optimization methods.
OPTIMIZATION AND ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Xuan Wu, Antonio J. J. Conejo
Summary: The paragraph describes a distribution system involving a supplying utility, prosumers, and conventional consumers, who interact through a distribution market. The prosumers optimize their hourly production/consumption, while the market operator derives hourly locational marginal prices (LMPs) using a minimum social-cost problem. Conventional consumers accept these prices, and the supplying utility sells energy at given prices. The interdependent problems of the prosumers and the market operator form an equilibrium problem, which is shown to be equivalent to an optimization problem.
IEEE TRANSACTIONS ON SMART GRID
(2023)
Review
Engineering, Electrical & Electronic
Line A. Roald, David Pozo, Anthony Papavasiliou, Daniel K. Molzahn, Jalal Kazempour, Antonio Conejo
Summary: Electric power systems and their stakeholders are facing increasing uncertainty caused by renewable energy, market liberalization, and climate change. This paper provides an overview of existing methods for modeling and optimizing problems affected by uncertainty, targeting researchers familiar with power systems and optimization. It also reviews important applications of optimization under uncertainty in power systems and discusses future research directions.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Federico Milano
Summary: This paper presents a generalization of the Park transform based on the Frenet frame, illustrating the features of the Frenet frame through various examples.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Engineering, Electrical & Electronic
Reza Mahroo, Amin Kargarian, Mahdi Mehrtash, Antonio J. Conejo
Summary: This paper proposes a hybrid column-and-constraint-generation augmented-Lagrangian algorithm to efficiently solve the robust security-constrained dynamic transmission expansion planning problem. The algorithm decomposes the problem into a master problem and a set of subproblems decomposable by time period. The computationally expensive master problem is further decomposed into three computationally efficient sub-master problems. The proposed algorithm shows efficient performance in solving security-constrained dynamic transmission expansion planning problems based on simulation results.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Jianzhe Liu, Yichen Zhang, Antonio J. Conejo, Feng Qiu
Summary: DC microgrids have potential applications in renewable integration, but the negative impedance effect of constant power loads (CPLs) can lead to instability. This paper proposes an innovative control synthesis algorithm to guarantee a theoretically guaranteed region of attraction (ROA) for a general DC microgrid, covering its entire operating range.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Gonzalo E. Constante-Flores, Antonio J. Conejo, Ricardo M. Lima
Summary: This article proposes a solution method for the large-scale stochastic unit commitment problem that includes weekly energy storage and significant weather-dependent stochastic generating capacity. By decomposing the problem into a mixed-integer linear master problem and linear and continuous subproblems, and using conditional value-at-risk as a risk measure, we improve the standard Benders decomposition method with the column-and -constraint generation algorithm. Our computational experiments demonstrate the effectiveness of the proposed decomposition method.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Spyros Chatzivasileiadis, Petros Aristidou, Ioannis Dassios, Tomislav Dragicevic, Daniel Gebbran, Federico Milano, Claudia Rahmann, Deepak Ramasubramanian
Summary: This paper collects the challenges and opportunities arising from millions of controllable devices deployed in power systems. The shift towards converter-interfaced resources brings both threats and opportunities, with new dynamic phenomena and instability on one hand, and decentralized response to disturbances on the other. The goal is to tap into the flexibility potential of these devices for safe power system operation, but it requires addressing modeling and control challenges. This paper identifies and describes these challenges.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Fabrizio De Caro, Antonio Pepiciello, Federico Milano, Alfredo Vaccaro
Summary: This paper proposes a novel data-driven algorithm called Monte Carlo Consensus Clustering (M3C) for measurement-based coherency detection in power systems. Unlike traditional clustering techniques, M3C automatically identifies the optimal and stable number of coherent groups affected by time-varying phenomena in power system operation. The proposed methodology is tested and validated using the IEEE 39-bus system. Results are compared with other existing clustering techniques and statistically analyzed using the Friedman test with post-hoc analysis, highlighting the advantages of the proposed approach.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Francesco Sanniti, Roberto Benato, Federico Milano
Summary: This paper investigates the transient behavior and frequency stability of a grid with a large share of distributed energy resources (DERs) during a bottom-up restoration process. Motivated by a real-world scenario, where the tripping of the DER frequency protections led to frequency instability and system collapse, the authors propose a DER control strategy based on estimating the rate of change of frequency and implementing fast frequency regulation. Through comprehensive stochastic analysis in the time domain, it is demonstrated that the proposed control strategy effectively prevents instability during the restoration process.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Muhammad Adeen, Federico Bizzarri, Davide del Giudice, Samuele Grillo, Daniele Linaro, Angelo Brambilla, Federico Milano
Summary: This letter presents a technique to calculate the variance of algebraic variables of power system models represented as a set of stochastic differential-algebraic equations. The technique utilizes the solution of a Lyapunov equation and requires the calculation of the state matrix of the system. The accuracy is evaluated by comparing the results with those obtained with Monte Carlo time domain simulations. Finally, the computational efficiency of the proposed approach is demonstrated through a case study based on a 1479-bus dynamic model of the all-island Irish transmission system compared to the Monte Carlo method.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Editorial Material
Engineering, Electrical & Electronic
Rui Bo, Linquan Bai, Antonio J. Conejo, Jianzhong Wu, Tao Jiang, Fei Ding, Babak Enayati
Summary: Driven by clean energy goals, the power industry is undergoing significant transformations, transitioning from a centralized power grid to a decentralized, localized control paradigm. Establishing local and distribution-level electricity markets is an effective solution for managing distributed energy resources and uncovering their value.
IEEE TRANSACTIONS ON SMART GRID
(2023)
Article
Engineering, Electrical & Electronic
Junru Chen, Wenjia Si, Muyang Liu, Federico Milano
Summary: This article studies the synchronization stability of Grid-Following Converter (GFL) and finds that faults cause variations of grid voltage and frequency, which affect the synchronization stability. The study shows that phase-angle jump affects the initial perturbance of GFL, while frequency affects the transient responses and stability boundary.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Sheng Chen, Antonio J. Conejo, Zhinong Wei
Summary: The power industry has introduced flexible ramping products (FRPs) to improve operational flexibility necessary for high penetration of renewables. However, FRPs are primarily provided by natural-gas-fired power generators and their capability to offer ramping service is dependent on the operational conditions of the natural gas system. To address this, a power-gas coordination model is developed, considering the requirement of FRPs. The model includes energy-FRP co-optimization in the power market and FRP-deployment gas constraints in the natural-gas market.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Xuan Wu, Antonio J. Conejo, Jianzhe Liu
Summary: In pursuit of resilience enhancement, this study proposes a hierarchical decision-making framework for the interaction between proactive consumers and the supplying utility through an electricity distribution system. The framework aims to identify optimal solutions for all stakeholders, including the electric utility, proactive consumers, and non-proactive consumers. Realistic distribution system cases are analyzed in this study.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
