Browsing by Author "Pozzi, Massimo"

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    Comparing secondary voltage regulation and shunt compensation for improving voltage stability and transfer capability in the Italian power system
    (Elsevier, 2004-10-01) Cañizares, Claudio A.; Cavallo, Claudio; Pozzi, Massimo; Corsi, Sandro
    This paper concentrates on comparing the advantages and disadvantages, including costs, of using secondary voltage regulation (SVR) versus using shunt-connected controllers, in particular mechanical switched capacitors (MSC), static var compensators (SVC) and static synchronous compensators (STATCOM), to improve voltage stability (VS) and the external transfer capability (TC) of the Italian power network. Basic VS and TC concepts and tools, as well as the models of the various controllers, particularly SVR, used to obtain the results presented are described in detail. The model of the Italian system used and the assumptions made for these studies are also discussed. The paper demonstrates that SVR is an option that should be seriously considered in practice when trying to improve VS and TC of power systems.
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    STATCOM modeling for voltage and angle stability studies
    (Elsevier, 2002-12-28) Cañizares, Claudio A.; Pozzi, Massimo; Corsi, Sandro; Uzunovic, Edvina
    This paper proposes and validates models to accurately represent static synchronous shunt compensators (STATCOM) in voltage and angle stability studies of powers systems. The proposed STATCOM stability models are justified based on the basic operational characteristics of this flexible AC transmission system (FACTS) controller for both phase and PWM control strategies. These models are first validated by means of EMTP simulations on a test system, and then are implemented into two different programs used to study voltage and angle stability issues in the system. All details of the model implementation, the controls used, and the data for the test system are provided in the paper.