Publications de Pulkit Nahata | EPFL Graph Search

Bayesian Error-in-Variables Models for the Identification of Distribution Grids

Jean-Sébastien Hubert Brouillon, Giancarlo Ferrari Trecate, Pulkit Nahata

The increasing integration of renewable energy requires a good model of the existing power distribution infrastructure, represented by its admittance matrix. However, a reliable estimate may either be missing or quickly become obsolete, as distribution gri ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2023

A Unified Passivity-Based Framework for Control of Modular Islanded AC Microgrids

Giancarlo Ferrari Trecate, Pulkit Nahata

Voltage and frequency control in an islanded ac microgrid (ImG) amounts to stabilizing an a priori unknown ImG equilibrium induced by loads and changes in topology. This article puts forth a unified control framework, which, while guaranteeing such stabili ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2022

Consensus-Based Current Sharing and Voltage Balancing in DC Microgrids with Exponential Loads

Giancarlo Ferrari Trecate, Pulkit Nahata, Mustafa Sahin Turan

2022

Identification of AC Distribution Networks With Recursive Least Squares and Optimal Design of Experiment

Giancarlo Ferrari Trecate, Pulkit Nahata

The increasing penetration of intermittent distributed energy resources in power networks calls for novel planning and control methodologies which hinge on detailed knowledge of the grid. However, reliable information concerning the system topology and par ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2022

Bayesian Methods for the Identification of Distribution Networks

Jean-Sébastien Hubert Brouillon, Giancarlo Ferrari Trecate, Pulkit Nahata

The increasing integration of intermittent renewable generation, especially at the distribution level, necessitates advanced planning and optimisation methodologies contingent on the knowledge of the admittance matrix, capturing the topology and line param ...

IEEE2021

Hierarchical Control of Islanded Microgrids with Flexible Structures

Pulkit Nahata

The primary objective of this doctoral thesis is the design and development of hierarchical control schemes for the overall operation and control of Islanded mGs (ImGs) with flexible structuresâ or, with no reference topologies. The control methodologies ...

EPFL2021

Hierarchical Control in Islanded DC Microgrids With Flexible Structures

Alessio La Bella, Giancarlo Ferrari Trecate, Pulkit Nahata

Hierarchical architectures stacking primary, secondary, and tertiary layers are widely employed for the operation and control of islanded dc microgrids (dcmGs) composed of distribution generation units (DGUs), loads, and power lines. However, a comprehensi ...

2020

A Passivity-Based Approach to Voltage Stabilization in DC Microgrids with ZIP loads

Giancarlo Ferrari Trecate, Michele Tucci, Pulkit Nahata, Raffaele Soloperto, Andrea Martinelli

We consider the application of passivity theory to the problem of voltage stabilization in DC microgrids, which are composed of distributed generation units, dynamic RLC lines, and nonlinear ZIP (constant impedance, constant current, and constant power) lo ...

2020

On Existence of Equilibria, Voltage Balancing, and Current Sharing in Consensus-Based DC Microgrids

Giancarlo Ferrari Trecate, Pulkit Nahata

This work presents new secondary regulators for current sharing and voltage balancing in DC microgrids, composed of distributed generation units, dynamic RLC lines, and nonlinear ZIP (constant impedance, constant current, and constant power) loads. The pro ...

IEEE2020

A Supervisory Control Structure for Voltage-Controlled Islanded DC Microgrids

Alessio La Bella, Giancarlo Ferrari Trecate, Pulkit Nahata

In this work, we propose a supervisory control structure in islanded DC microgrids such that a well scheduled and balanced utilization of various resources is achieved. Our supervisory control layer rests on top of a voltage-controlled primary layer and co ...

2019

Passivity-based Voltage and Frequency Stabilization in AC microgrids

Giancarlo Ferrari Trecate, Pulkit Nahata

In this paper, we investigate the stability of an islanded AC microgrid (ImG) composed of Distributed generation units (DGUs), dynamic power lines, and loads. Each DGU is equipped with a local controller to ensure desired voltage and frequency in the ImG. ...

IEEE2019

Voltage Stabilization in MVDC Microgrids Using Passivity-Based Nonlinear Control

Giancarlo Ferrari Trecate, Pulkit Nahata, Andrea Martinelli

This paper investigates the application of passivity-based nonlinear control to the problem of primary voltage stabilization in medium-voltage DC microgrids (MVDC mGs) given by the interconnection of nonlinear distributed generation units (DGUs) and power ...

IEEE2018

Distributed Cyber-Attack Detection in the Secondary Control of DC Microgrids

Giancarlo Ferrari Trecate, Pulkit Nahata, Mustafa Sahin Turan

The paper considers the problem of detecting cyber-attacks occurring in communication networks typically used in the secondary control layer of DC microgrids. The proposed distributed methodology allows for scalable monitoring of a microgrid and is able to ...

2018

A Passivity-Based Approach to Voltage Stabilization in DC Microgrids

Giancarlo Ferrari Trecate, Michele Tucci, Pulkit Nahata, Raffaele Soloperto

We consider the application of passivity theory to the problem of voltage stabilization in DC microgrids (DCmGs) given by the interconnection of Distributed Generation Units (DGUs), dynamic RL lines, and loads. We first provide a novel result on stable int ...

IEEE2018

Distributed Cyber-Attack Detection in the Secondary Control of DC Microgrids

Giancarlo Ferrari Trecate, Pulkit Nahata, Mustafa Sahin Turan

The paper considers the problem of detecting cyber-attacks occurring in communication networks typically used in the secondary control layer of DC microgrids. The proposed distributed methodology allows for scalable monitoring of a microgrid and is able to ...

IEEE2018

A Decentralized Switched System Approach to Overvoltage Prevention in PV Residential Microgrids

Pulkit Nahata, Florian Dörfler

In this paper, we consider the problem of overvoltage arising in PV residential microgrids due to excessive power injection into the grid by the PV generators. We propose a decentralized switched controller to curtail excess active power in order to avoid ...

2017