Papers by MASSIMO LA SCALA
Institution of Engineering and Technology eBooks, Aug 5, 2016
This chapter discusses a methodology for the assessment of corrective control actions to be imple... more This chapter discusses a methodology for the assessment of corrective control actions to be implemented in power system after the occurrence of a severe contingency. This pre-calculation can be intended as one of the contingency screening functions to be developed within each Supervisory Control and Data Acquisition (SCADA)/Energy Management Systems (EMS) control cycle and in the framework of online Dynamic Security Assessment (DSA). It is assumed that, based on latest system state information and calculations carried out for a selected number of severe fault events, pre-calculated control actions can be applied on actuators during the power system transient that follows such contingencies. The methodology can be adopted, for example, for the arming of Remedial Actions Schemes based on load shedding, generation shedding, Flexible AC Transmission Systems (FACTS) or any other fast actuator. The goal is preserving power system stability and its integrity even after that a specific severe contingency had occurred. The proposed methodology is based on the conversion of a dynamic optimization problem in the continuous time domain, into a static optimization problem in the discrete time domain. In order to show the key working principle of the proposed approach, a dynamic optimization problem is first formulated in his general form and then solved with the classical method and through discretization. Finally, the methodology is explicitly adapted to the set of equations and constraints that represent the dynamic behaviour of power systems. The same general methodology is then also applied to the solution of a preventive control optimization problem.
IEEE Transactions on Power Systems, 2006
This paper presents two mathematical models and one methodology to solve a transmission network e... more This paper presents two mathematical models and one methodology to solve a transmission network expansion planning problem considering uncertainty in demand. The first model analyzed the uncertainty in the system as a whole; then, this model considers the uncertainty in the total demand of the power system. The second one analyzed the uncertainty in each load bus individually. The methodology
In this paper a stochastic reactive power market clearing is presented. In this market, the expec... more In this paper a stochastic reactive power market clearing is presented. In this market, the expected value of the total payment by the independent system operator is minimized by using particle swarm optimization algorithm. By using the developed stochastic reactive power market model, the impacts of synchronous generators’ forced outage rates on reactive power market’s cost has investigated. Numerical studies have been performed on the IEEE 24-bus Reliability Test System (RTS). The results evidenced that the lower the forced exit rate of the units, the lower the cost paid by the independent operator of the system to settle the reactive power market.
Distributed energy management systems (EMS) open up several alternative design options. Metacompu... more Distributed energy management systems (EMS) open up several alternative design options. Metacomputing allows joining of parallel and distributed environments to build decentralized, fault tolerant and geographically widespread computer systems. In this paper, we illustrate a metacomputing implementation of contingency analysis applied to real-time transient stability analysis (TSA)
2022 IEEE 7th International Energy Conference (ENERGYCON), May 9, 2022
Power Systems Computation Conference, 2002
IEEE International Conference on Probabilistic Methods Applied to Power Systems, 2002
IEEE Power Engineering Society General Meeting, Jun 1, 2007
... Integrating Dynamic Optimization Methodologies with WAMS technologies S. Bruno, Member, IEEE,... more ... Integrating Dynamic Optimization Methodologies with WAMS technologies S. Bruno, Member, IEEE, M. De Benedictis, Member, IEEE, M. La Scala, Fellow, IEEE A 1-4244-1298-6/07/$25.00 ©2007 IEEE. ... 5. Fig. 5. Rotor angle of a generator at S. Filippo del Mela (test #1) ...
Large Engineering Systems Conference on Power Engineering, 2000
Real-time monitoring of power system dynamics can help in identifying poorly damped modes of osci... more Real-time monitoring of power system dynamics can help in identifying poorly damped modes of oscillation and possible threats to the security of the system. System monitoring can avoid or mitigate the effects of black-outs if equipped with a good man-machine interface. In this paper, a monitoring architecture based on wavelet spectral analysis and WAMS is proposed. The wavelet analysis of
IEEE Transactions on Power Systems, 2000
AbstractThis paper deals with the development of a nonlinear programming methodology for evaluat... more AbstractThis paper deals with the development of a nonlinear programming methodology for evaluating Load Shedding (LS) as a corrective action to improve the dynamic security of power systems when angle or voltage instability is detected. A centralized correc-tive control is ...
IEEE Transactions on Industry Applications, Mar 1, 2023
Small-sized non-synchronous islands, which are inherently characterized by low system inertia, wi... more Small-sized non-synchronous islands, which are inherently characterized by low system inertia, will face in the next years the challenge of integrating larger and larger amount of renewable energy sources, leading to further reduction of inertia. Several means to support inertia and frequency transients have been proposed in the literature, including energy storage systems, distributed generation, and demand response. LED street lighting systems are widespread control resources, which in a smart grid scenario, can be regulated by means of local or remote control signals. This article investigates the possibility to regulate the power consumption of LED street lighting to provide frequency support in a system characterized by reduced total inertia. Tests are carried out integrating the simulation of the non-synchronous power system of an Italian small island with the response of an actual LED street lamp, in a Power Hardware-in-the-Loop testing environment. Both synthetic inertia and fast frequency response approaches are tested and discussed.
IEEE PowerTech Conference, 1999
Summary form only given. The aim of this paper is to introduce a new methodology, based on dynami... more Summary form only given. The aim of this paper is to introduce a new methodology, based on dynamic optimization, for assessing preventive control actions to guarantee dynamic security of power systems. In order to mitigate the effect of a contingency, in terms of steady-state or transient violation such as overloads, unacceptable transient voltage dips, system instability, preventive actions are applied as soon as a potentially dangerous violation is detected during a contingency screening. The proposed approach entails the ability to force the system trajectories in an acceptable state space domain under a set of severe but credible contingencies and gives indications about preventive actions when necessary. The approach is sufficiently general to improve the transient behavior of a power system with regard to different objectives such as: to enforce angle stability of the system constraining rotor angle deviations and minimizing the integral of transient kinetic energy across the whole trajectory; and to avoid transient voltage stability using a signal energy based on an integral form of the voltage magnitude at each bus of the system. This methodology consists of an optimization procedure where: the objective function is aimed at minimizing control action efforts; inequality constraints confine the trajectory of the system in a practical domain of the state space ensuring a feasible behavior of the system, power quality, etc.; and equality constraints derive from the discretization of the differential-algebraic equations of the power system sparse representation
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Papers by MASSIMO LA SCALA