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Milano, Federico
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Milano, Federico
Official Name
Milano, Federico
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Now showing 1 - 10 of 23
- PublicationEfficient implementation of MPC-based AGC for real-world systems with low inertiaThe paper discusses practical implementation and computational aspects of an AGC scheme based on model predictive control (MPC) for a real-world power system, namely the all-island Irish transmission system. This system is particularly interesting from the frequency regulation point of view due to the high penetration of wind power generation. This leads to a significant reduction in system inertia, which in turn impacts on the ability of the system operator to regulate the system frequency. The paper compares the performance of the MPC-based AGC with a conventional AGC based on PI controllers and draws relevant conclusions. The case study is a high-resolution simulation of a 1479-bus model of the Irish electrical grid with significant wind penetration, stochastic loads, and controller delays.
463Scopus© Citations 14 - PublicationFrequency Participation FactorsThis paper discusses two quantitative and complementary approaches to evaluate the participation of synchronous generators and interconnection buses on local bus frequency variations during electromechanical transients. Both approaches are based on the concept of frequency divider formula recently proposed by the authors on these transactions. A thorough comparison of the two approaches is provided considering several scenarios and three networks, namely the New England 39-bus test system, the all-island 1,479-bus Irish transmission system, and the ENTSO-E 21,177-bus transmission system.
510Scopus© Citations 6 - PublicationValidating Two Novel Equivalent Impedance EstimatorsCertain approaches to appraising voltage stability use an equivalent impedance to characterise the wider power system. This letter proposes two newways of inferring an appropriate equivalent impedance from a powersystem's admittance matrix. Continuation power flow simulations are used to validate the quality of the new estimators, and to benchmark them against some extant approaches.
488 - PublicationModel Predictive Control-Based AGC for Multi-Terminal HVDC-Connected AC gridsMulti-terminal high-voltage direct current (MTDC) grids are seen as the enabling technology in the development of massive scale international grids such as the European supergrid. It is expected that these grids can play a significant role in regulating ac system frequencies. To date, many proportional-integral (PI) controller-based techniques have been proposed for frequency regulation in ac MTDC-connected grids. In this paper, model predictive control (MPC) is proposed as a means of implementing automatic generation control, while minimizing dc grid power losses. The advantages of using MPC versus PI are highlighted with regard to improvements in both frequency and dc grid regulation, while explicitly considering both delays and dc voltage constraints.
529 - PublicationAnalysis of the Impact of Microgrid Penetration on Power System DynamicsThe paper proposes a stochastic model to analyse the dynamic coupling of the transmission system, the electricity market, and microgrids. The focus is on the impact of microgrids on the transient response of the system and, in particular, on frequency variations. Extensive Monte Carlo simulations are performed on the IEEE 39-bus system, and show that the dynamic response of the transmission system is affected in a nontrivial way by both the number and the size of the microgrids.
440Scopus© Citations 29 - PublicationSimApi, a smartgrid co-simulation software platform for benchmarking building control algorithmsThis paper describes an open source smart grid software infrastructure for co-simulation between cloud-based energy management systems and a building energy model. The core component of the infrastructure is an API, which provides a protocol abstraction as a decoupling mechanism between the control algorithms and the building, thereby facilitating the development and testing of intelligent controllers. The open-source infrastructure can be utilised for the development and benchmarking of smart grid demand response algorithms aimed at reducing the energy consumption and the carbon footprint of buildings, while facilitating the integration of renewable energies into the power system.
499Scopus© Citations 21 - PublicationSimplified Model to Study the Induction Generator Effect of the Subsynchronous Resonance PhenomenonThis letter presents a simple model of induction machines able to appraise the induction generator effect of the subsynchronous resonance phenomenon. The proposed model is general and can be applied to induction machines utilized in wind power applications, such as doubly-fed induction generators. A rigorous stability analysis is carried out based on the proposed model. This analysis shows that the induction generator effect leads to a Neimark–Sacker bifurcation.
676Scopus© Citations 25 - PublicationSmall-Signal Stability Analysis for Non-Index 1 Hessenberg Form Systems of Delay Differential-Algebraic Equations(Institute of Electrical and Electronics Engineers (IEEE), 2016-07-11)
; This paper focuses on the small-signal stability analysis of systems modelled as differential-algebraic equations and with inclusions of delays in both differential equations and algebraic constraints. The paper considers the general case for which the characteristic equation of the system is a series of infinite terms corresponding to an infinite number of delays. The expression of such a series and the conditions for its convergence are first derived analytically. Then, the effect on small-signal stability analysis is evaluated numerically through a Chebyshev discretization of the characteristic equations. Numerical appraisals focus on hybrid control systems recast into delay algebraic-differential equations as well as a benchmark dynamic power system model with inclusion of long transmission lines.346Scopus© Citations 48 - PublicationModeling, Simulation, and Comparison of Control Techniques for Energy Storage SystemsThis paper describes the modeling and formulation of a variety of deterministic techniques for energy storage devices, namely the PI, H-infinity, and sliding mode controllers. These techniques are defined based on a general, yet detailed, energy storage device model, which is accurate for transient stability analysis. The paper also presents a thorough statistical comparison of the performance and robustness of the considered control techniques, using stochastic dynamic models and a variety of disturbances and scenarios. The case study is based on a 1479-bus model of the all-island Irish transmission system and an energy storage device actually installed in the system.
859Scopus© Citations 44 - PublicationOn the Stability Analysis of Systems of Neutral Delay Differential EquationsThis paper focuses on the stability analysis of systems modeled as neutral delay differential equations (NDDEs). These systems include delays in both the state variables and their time derivatives. The proposed approach consists of a descriptor model transformation that constructs an equivalent set of delay differential algebraic equations (DDAEs) of the original NDDEs. We first rigorously prove the equivalency between the original set of NDDEs and the transformed set of DDAEs. Then, the effect on stability analysis is evaluated numerically through a delay-independent stability criterion and the Chebyshev discretization of the characteristic equations.
606Scopus© Citations 46