62 citations · 237 across the 31 of their papers we have counts for
36 papers
Metastable opinion dynamics with hidden preferences: an Ising model with neutral agents
Simone Baldassarri, Vanessa Jacquier, Alessandro Zocca
We introduce a new Ising-type framework for opinion dynamics that explicitly separates private preferences from publicly expressed binary opinions and naturally incorporates neutra…
Dynamic Dimensioning of Frequency Containment Reserves: The Case of the Nordic Grid
Jöbke Janssen, Alessandro Zocca, Bert Zwart +1
One of the main responsibilities of a Transmission System Operator (TSO) operating an electric grid is to maintain a designated frequency (e.g., 50 Hz in Europe). To achieve this,…
Critical configurations of the hard-core model on square grid graphs
Simone Baldassarri, Vanessa Jacquier, Alessandro Zocca
We consider the hard-core model on a finite square grid graph with stochastic Glauber dynamics parametrized by the inverse temperature . We investigate how the transition betwee…
Uncovering Load-Altering Attacks Against N-1 Secure Power Grids: A Rare-Event Sampling Approach
Maldon Patrice Goodridge, Subhash Lakshminarayana, Alessandro Zocca
Load-altering attacks targetting a large number of IoT-based high-wattage devices (e.g., smart electric vehicle charging stations) can lead to serious disruptions of power grid ope…
Analysis of Cascading Failures Due to Dynamic Load-Altering Attacks
Maldon Patrice Goodridge, Alessandro Zocca, Subhash Lakshminarayana
Large-scale load-altering attacks (LAAs) are known to severely disrupt power grid operations by manipulating several internet-of-things (IoT)-enabled load devices. In this work, we…
Ising model on clustered networks: A model for opinion dynamics
Simone Baldassarri, Anna Gallo, Vanessa Jacquier +1
We study opinion dynamics on networks with a nontrivial community structure, assuming individuals can update their binary opinion as the result of the interactions with an external…
RangL: A Reinforcement Learning Competition Platform
Viktor Zobernig, Richard A. Saldanha, Jinke He +12
The RangL project hosted by The Alan Turing Institute aims to encourage the wider uptake of reinforcement learning by supporting competitions relating to real-world dynamic decisio…
Interface Networks for Failure Localization in Power Systems
Chen Liang, Alessandro Zocca, Steven H. Low +1
Transmission power systems usually consist of interconnected sub-grids that are operated relatively independently. When a failure happens, it is desirable to localize its impact wi…
Refining bridge-block decompositions through two-stage and recursive tree partitioning
Leon Lan, Alessandro Zocca
In transmission networks power flows and network topology are deeply intertwined due to power flow physics. Recent literature shows that specific network substructures named bridge…
Mixed-integer linear programming approaches for tree partitioning of power networks
Leon Lan, Alessandro Zocca
In transmission networks, power flows and network topology are deeply intertwined due to power flow physics. Recent literature shows that a specific more hierarchical network struc…
Hopping between distant basins
Maldon Goodridge, John Moriarty, Jure Vogrinc +1
We present the Basin Hopping with Skipping (BH-S) algorithm for stochastic optimisation, which replaces the perturbation step of basin hopping (BH) with a so-called skipping propos…
A Spectral Representation of Power Systems with Applications to Adaptive Grid Partitioning and Cascading Failure Localization
Alessandro Zocca, Chen Liang, Linqi Guo +2
Transmission line failures in power systems propagate and cascade non-locally. This well-known yet counter-intuitive feature makes it even more challenging to optimally and reliabl…
Line Failure Localization of Power Networks Part II: Cut Set Outages
Linqi Guo, Chen Liang, Alessandro Zocca +2
Transmission line failure in power systems prop-agate non-locally, making the control of the resulting outages extremely difficult. In Part II of this paper, we continue the study…
Adaptive Network Response to Line Failures in Power Systems
Chen Liang, Linqi Guo, Alessandro Zocca +2
Transmission line failures in power systems propagate and cascade non-locally. In this work, we propose an adaptive control strategy that offers strong guarantees in both the mitig…
Line Failure Localization of Power Networks Part I: Non-cut Outages
Linqi Guo, Chen Liang, Alessandro Zocca +2
Transmission line failures in power systems propagate non-locally, making the control of the resulting outages extremely difficult. In this work, we establish a mathematical theory…
An Integrated Approach for Failure Mitigation & Localization in Power Systems
Chen Liang, Linqi Guo, Alessandro Zocca +3
The transmission grid is often comprised of several control areas that are connected by multiple tie lines in a mesh structure for reliability. It is also well-known that line fail…
Large Fluctuations in Locational Marginal Prices
Tommaso Nesti, John Moriarty, Alessandro Zocca +1
This paper investigates large fluctuations of Locational Marginal Prices (LMPs) in wholesale energy markets caused by volatile renewable generation profiles. Specifically, we study…
Weighted Dyck paths for nonstationary queues
Gianmarco Bet, Jori Selen, Alessandro Zocca
We consider a model for a queue in which only a fixed number of customers can join. Each customer joins the queue independently at an exponentially distributed time. Assuming f…
A Metropolis-class sampler for targets with non-convex support
John Moriarty, Jure Vogrinc, Alessandro Zocca
We aim to improve upon the exploration of the general-purpose random walk Metropolis algorithm when the target has non-convex support , by reusing proposals…
Less is More: Real-time Failure Localization in Power Systems
Linqi Guo, Chen Liang, Alessandro Zocca +2
Cascading failures in power systems exhibit non-local propagation patterns which make the analysis and mitigation of failures difficult. In this work, we propose a distributed cont…
Temporal starvation in multi-channel CSMA networks: an analytical framework
Alessandro Zocca
In this paper we consider a stochastic model for a frequency-agile CSMA protocol for wireless networks where multiple orthogonal frequency channels are available. Even when the pos…
Frequency violations from random disturbances: an MCMC approach
John Moriarty, Jure Vogrinc, Alessandro Zocca
The frequency stability of power systems is increasingly challenged by various types of disturbances. In particular, the increasing penetration of renewable energy sources is incre…
Failure Localization in Power Systems via Tree Partitions
Linqi Guo, Chen Liang, Alessandro Zocca +2
Cascading failures in power systems propagate non-locally, making the control and mitigation of outages extremely hard. In this work, we use the emerging concept of the tree partit…
Optimization of stochastic lossy transport networks and applications to power grids
Alessandro Zocca, Bert Zwart
Motivated by developments in renewable energy and smart grids, we formulate a stylized mathematical model of a transport network with stochastic load fluctuations. Using an affine…