Search for: large-scale-power-systems
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    Application of synchronised phasor measurements to wide-area fault diagnosis and location

    , Article IET Generation, Transmission and Distribution ; Vol. 8, issue. 4 , 2014 , pp. 716-729 ; ISSN: 17518687 Salehi-Dobakhshari, A ; Ranjbar, A. M ; Sharif University of Technology
    This study introduces a novel approach to power system fault diagnosis by synchronised phasor measurements. Conventionally, faults are diagnosed through the status of protective relays and circuit breakers which are activated following a fault. However, the hidden failures of the protection system has itself often been among the main suspects of partial or widespread blackouts. This study proposes an alternative fault diagnosis approach independent of the function of the protection system. An analytical method is introduced for power system fault diagnosis using dispersed synchronised measurements and bus impedance matrix (Zbus). Fault inception is first detected by local phasor measurement... 

    Composite power system adequacy assessment based on postoptimal analysis

    , Article Turkish Journal of Electrical Engineering and Computer Sciences ; Volume 21, Issue 1 , 2013 , Pages 90-106 ; 13000632 (ISSN) Safdarian, A ; Fotuhi Firuzabad, M ; Aminifar, F ; Sharif University of Technology
    The modeling and evaluation of enormous numbers of contingencies are the most challenging impediments associated with composite power system adequacy assessment, particularly for large-scale power systems. Optimal power flow (OPF) solution, as a widely common approach, is normally employed to model and analyze each individual contingency as an independent problem. However, mathematical representations associated with diverse states are slightly different in one or a few generating units, line outages, or trivial load variations. This inherent attribute brings a promising idea to speed up the contingency evaluation procedure. In this paper, postoptimal analysis (POA), as a well-recognized... 

    Power system stability assessment during restoration based on a wide area measurement system

    , Article IET Generation, Transmission and Distribution ; Volume 6, Issue 11 , 2012 , Pages 1171-1179 ; 17518687 (ISSN) Nourizadeh, S ; Karimi, M. J ; Ranjbar, A. M ; Shirani, A ; Sharif University of Technology
    Online power system stability assessment during restoration has not been strongly addressed yet. The introduction of wide area measurement systems (WAMS), however, made it possible to monitor the stability online. This study technically presents a detailed analysis of stability during restoration using WAMS. The power system build-up strategy is used as the restoration approach, based on which the early and the last stages of restoration are to divide the power system into islands and interconnect them, respectively. In fact, the practical use of WAMS at the early stages of restoration provides precise determination of generators loading steps. Moreover, unification of phase angle references... 

    Two-level optimal load-frequency control for multi-area power systems

    , Article International Journal of Electrical Power and Energy Systems ; Volume 53, Issue 1 , December , 2013 , Pages 540-547 ; 01420615 (ISSN) Rahmani, M ; Sadati, N ; Sharif University of Technology
    In large-scale power systems, classical centralized control approaches may fail due to geographically distribution of information and decentralized controllers result in sub-optimal solution for load-frequency control (LFC) problems. In this paper, a two-level structure is presented to obtain optimal solution for LFC problems and also reduce the computational complexity of centralized controllers. In this approach, an interconnected multi-area power system is decomposed into several sub-systems (areas) at the first-level. Then an optimization problem in each area is solved separately, with respect to its local information and interaction signals coming from other areas. At the second-level,... 

    Optimal multi-stage PMU placement in electric power systems using Boolean algebra

    , Article International Transactions on Electrical Energy Systems ; Volume 24, Issue 4 , 2015 , Pages 562-577 ; 20507038 (ISSN) Azizi, S ; Salehi Dobakhshari, A ; Nezam Sarmadi, S. A ; Ranjbar, A. M ; Gharehpetian, G. B ; Sharif University of Technology
    John Wiley and Sons Ltd  2015
    Placement of phasor measurement units (PMUs) in power systems has often been formulated for achieving total network observability. In practice, however, the installation process is not implemented at once, but at several stages, because the number of available PMUs at each time period is restricted due to financial problems. This paper presents a novel integer linear programming framework for optimal multi-stage PMU placement (OMPP) over a preset schedule, in order to improve the network observability during intermediate stages, in addition to its complete observability by the end of the PMU placement process. To precisely evaluate the network observability and fully exploit the potential of... 

    A sectionalizing method in power system restoration based on wide area measurement systems

    , Article EPEC 2010 - IEEE Electrical Power and Energy Conference: "Sustainable Energy for an Intelligent Grid", 25 August 2010 through 27 August 2010 ; August , 2010 ; 9781424481880 (ISBN) Nezam Sarmadi, S. A ; Salehi Dobakhshari, A ; Azizi, S ; Ranjbar, A. M ; Nouri Zadeh, S ; Sharif University of Technology
    This paper presents a novel sectionalizing method for the build-up strategy in power system restoration. Power system restoration is the procedure of restoring power system elements after a partial or a complete blackout. Because of its economic and political importance, different strategies have been developed for power system restoration. One of the most practical and economical is the build-up strategy that includes the process of restoring separated parts (islands) in the power system and interconnecting them afterwards. This paper intends to develop a systematic algorithm for sectionalizing a power system considering various constraints such as black-start capability of generators,... 

    Optimal placement of phasor measurement units using immunity genetic algorithm

    , Article IEEE Transactions on Power Delivery ; Volume 24, Issue 3 , 2009 , Pages 1014-1020 ; 08858977 (ISSN) Aminifar, F ; Lucas, C ; Khodaei, A ; Fotuhi Firuzabad, M ; Sharif University of Technology
    This paper investigates the application of immunity genetic algorithm (IGA) for the problem of optimal placement of phasor measurement units (PMUs) in an electric power network. The problem is to determine the placement sites of the minimal set of PMUs which makes the system observable. Incorporating immune operator in the canonical genetic algorithm (GA), on the condition of preserving GA's advantages, utilizes some characteristics and knowledge of the problems for restraining the degenerative phenomena during evolution, so as to improve the algorithm efficiency. This type of prior knowledge about some parts of optimal solution exists in the PMU placement problem. So, the IGA is adopted in... 

    Non-Stationary stabilized fast transversal RLS filter for online power system modal estimation

    , Article IEEE Transactions on Power Systems ; Volume 34, Issue 4 , 2019 , Pages 2744-2754 ; 08858950 (ISSN) Setareh, M ; Parniani, M ; Aminifar, F ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    Online monitoring of inter-area oscillations is a vital need for secure operation of large-scale power systems. This paper aims at online estimation of inter-area modes by a novel stabilized fast transversal recursive least squares (SFTRLS) filter running on ambient power system data received from phasor measurement units. The SFTRLS filter is a fast finite-impulse response adaptive filter that is widely used in communication applications, such as noise and echo cancelation. It has the lowest computational complexity among least-squares filters and directly calculates coefficients of the parametric model selected for identifying a system under study. In the proposed method, the SFTRLS filter... 

    Expansion planning of generation technologies in electric energy systems under water use constraints with renewable resources

    , Article Sustainable Energy Technologies and Assessments ; Volume 43 , 2021 ; 22131388 (ISSN) Pourmoosavi, M. A ; Amraee, T ; Firuzabad, M. F ; Sharif University of Technology
    Elsevier Ltd  2021
    Thermal power generation needs great volumes of water for cooling purposes. A multi-period Low Water Generation Expansion Planning (LW-GEP) model is proposed to plan the future generation mix including type, capacity, time of installation, and proper cooling system of generation technologies to supply the future electric peak loads under the water resource limitations. Different types of generation technologies with conventional and modern cooling systems are considered as expansion candidates in the proposed LW-GEP model. The access of candidate and existing power plants to the water resources are considered. Renewable resources as water smart solutions are integrated in the proposed energy...