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  • Todorovski, Mirko  (8)
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  • 1
    Language: English
    In: International Journal of Electrical Power and Energy Systems, 2015, Vol.73, p.157(6)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.ijepes.2015.05.012 Byline: Vladimir Zdraveski, Mirko Todorovski, Ljupco Kocarev Abstract: * We present an algorithm for dynamic intelligent load balancing (DILB) in a PDN. * The algorithm is heuristic, generic, recursive, fast and applicable in a real PDN. * We improve the overall load balance in a PDN and minimize active power losses. * We test the algorithm on existing PDN models and address the achieved improvement. Article History: Received 27 June 2014; Revised 30 April 2015; Accepted 5 May 2015
    Keywords: Algorithms – Analysis
    ISSN: 0142-0615
    Source: Cengage Learning, Inc.
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  • 2
    Language: English
    In: The European Physical Journal Special Topics, 2014, Vol.223(12), pp.2387-2409
    Description: Transient stability and steady-state (small signal) stability in power girds are reviewed. Transient stability concepts are illustrated with simple examples; in particular, we consider three methods for computing region of attraction: time-simulations, extended Lyapunov function, and sum of squares optimization method. We discuss steady state stability in power systems, and present an example of a feedback control via a communication network for the 10 Unit 39 Bus New England Test system.
    Keywords: Electrical Engineering ; Computer Science;
    ISSN: 1951-6355
    E-ISSN: 1951-6401
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  • 3
    Description: Efficient control of power systems is becoming increasingly difficult as they gain in complexity and size. We propose an automatic control strategy that regulates the mechanical power output of the generators in a power grid based on information obtained via a communication infrastructure. An algorithm that optimizes steady-state stability of a power grid by iteratively adding communication links is presented. The proposed control scheme is successfully applied to the IEEE New England and IEEE RTS 96 power systems, leading to a significant increase in the steady-state stability of the systems and an improvement in their overall robustness. The resulting communication network topology differs significantly from the transmission grid topology. This shows how complex the steady- state control for power systems is, influenced by the generators configuration, the transmission network topology, and the manner by which control is executed. Comment: Submitted and currently under review in IEEE Transactions on Circuits and Systems - 2
    Keywords: Computer Science - Systems And Control ; Mathematics - Optimization And Control ; Nonlinear Sciences - Adaptation And Self-Organizing Systems
    Source: Cornell University
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  • 4
    Language: English
    In: IEEE Journal on Emerging and Selected Topics in Circuits and Systems, September 2017, Vol.7(3), pp.349-358
    Description: Efficient control of power systems is becoming increasingly difficult as they gain in complexity and size. By considering a power grid and a communication infrastructure as a multiplex network, we propose an automatic control strategy that regulates the mechanical power output of the generators based on information obtained via communication links (wireless or wired). An algorithm that optimizes steady-state stability of a power grid by iteratively adding communication links is presented. The proposed control scheme is successfully applied to the IEEE New England and the IEEE RTS 96 power systems, leading to a significant increase in the steady-state stability of the systems and an improvement in their overall robustness. The resulting communication network topology differs significantly from the transmission grid topology. This shows how complex the steady-state control for power systems is, influenced by the generators' configuration, the transmission network topology, and the manner by which control is executed.
    Keywords: Power System Stability ; Multiplexing ; Power Grids ; Steady-State ; Stability Criteria ; Generators ; Power Systems ; Smart Grid ; Control ; Stability ; Multiplex Networks ; Engineering
    ISSN: 2156-3357
    E-ISSN: 2156-3365
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  • 5
    Language: English
    In: New Journal of Physics, 2014, Vol.16(11), p.115011 (14pp)
    Description: Plug-in electric vehicles (PEVs) can serve in discharge mode as distributed energy and power resources operating as vehicle-to-grid (V2G) devices and in charge mode as loads or grid-to-vehicle devices. It has been documented that PEVs serving as V2G systems can offer possible backup for renewable power sources, can provide reactive power support, active power regulation, load balancing, peak load shaving, can reduce utility operating costs and can generate revenue. Here we show that PEVs can even improve power grid transient stability, that is, stability when the power grid is subjected to large disturbances, including bus faults, generator and branch tripping, and sudden large load changes. A control strategy that regulates the power output of a fleet of PEVs based on the speed of generator turbines is proposed and tested on the New England 10-unit 39-bus power system. By regulating the power output of the PEVs we show that (1) speed and voltage fluctuations resulting from large disturbances can be significantly reduced up to five times, and (2) the critical clearing time can be extended by 20–40%. Overall, the PEVs control strategy makes the power grid more robust.
    Keywords: Computer Science - Systems And Control ; Mathematics - Optimization And Control ; Nonlinear Sciences - Adaptation And Self-Organizing Systems;
    E-ISSN: 1367-2630
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  • 6
    Language: English
    In: IEEE Transactions on Circuits and Systems II: Express Briefs, April 2017, Vol.64(4), pp.422-426
    Description: This brief proposes a dynamic intelligent load balancing and reactive power compensation switch plugin for power meters and a smart scalable system architecture applicable as an add-on to the existing power distribution networks. The load-balancing module will improve the load balance in a network and thus decrease power losses, whereas the distributed reactive power compensator will decrease the total reactive power. The novel approach is presented from its IT/networks perspective as well as from the physical layer with oscilloscope measurements and time analysis of the phase-swapping event.
    Keywords: Reactive Power ; Switches ; Capacitors ; Servers ; Load Management ; Circuits and Systems ; Phase Measurement ; Dynamic Intelligent Load Balancing ; Load Balancing ; Power Distribution Network (Pdn) ; Reactive Power Compensation ; Engineering
    ISSN: 1549-7747
    E-ISSN: 1558-3791
    Source: IEEE Conference Publications
    Source: IEEE Journals & Magazines 
    Source: IEEE Xplore
    Source: IEEE Journals & Magazines
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  • 7
    Language: English
    In: International Journal of Electrical Power and Energy Systems, December 2015, Vol.73, pp.157-162
    Description: Using hierarchical, client–server addressing concepts and identifying the load balancing problem among phases in 3-phase systems, we propose a novel, very simple algorithm for dynamic intelligent load balancing (DILB), that decreases the power losses in a power distribution network (PDN). Our solution is easily applicable to every part of a PDN, without essential changes to the last-line power installation. We present the DILB-extended PDN architecture, the algorithm itself as well as the results of the simulation on the well known IEEE 34-Bus, 37-Bus and 123-Bus networks that confirm the expected level of active power losses minimization.
    Keywords: Power Distribution Network ; Load Balancing ; Dynamic Intelligent Load Balancing ; Engineering
    ISSN: 0142-0615
    E-ISSN: 1879-3517
    Source: ScienceDirect Journals (Elsevier)
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  • 8
    Description: Plug-in electrical vehicles (PEV) are capable of both grid-to-vehicle (G2V) and vehicle-to-grid (V2G) power transfer. The advantages of developing V2G include an additional revenue stream for cleaner vehicles, increased stability and reliability of the electric grid, lower electric system costs, and eventually, inexpensive storage and backup for renewable electricity. Here we show how smart control of PEVs can improve the stability of power grids using only local frequency measurements. We evaluate the proposed control strategy on the IEEE Case 3 and the IEEE New England power systems. The results show that V2G leads to improved steady-state stability, larger region of stability, reduced frequency and voltage fluctuations during transients and longer critical clearing times. Comment: 18 pages, 7 figures, subbmited for review in Elsevier's International Journal of Electrical Power & Energy Systems
    Keywords: Computer Science - Systems And Control
    Source: Cornell University
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