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Showing papers in "International Transactions on Electrical Energy Systems in 2019"





Journal ArticleDOI
TL;DR: In this paper, the authors focused on the existing controllers in terms of their merits and limitations and explored the state of the art of the local power distribution system especially on renewable energy resources along with energy storage methods.
Abstract: Microgrid implementation requires effective and efficient strategies for controlling the grid parameters. Various problems are encountered with the deployment of distributed generation in terms of reverse power, an imbalance between power generation and nonlinear load. This paper is focused on the existing controllers in terms of their merits and limitations. Furthermore, the state of the art of the local power distribution system especially on renewable energy resources along with energy storage methods is explored. Reliability and stability of power flow between sources and consumers via voltage source inverter are also considered. The emerging microgrid concept in islanding and grid-connected mode using different controller along with soft computing algorithm are presented. This paper gives the reader fast insight into the context of the controller and its application.

64 citations


Journal ArticleDOI
TL;DR: A novel adaptive fractional-order PID (AFOPID) control of a permanent magnetic synchronous generator (PMSG) based wind energy conversion system (WECS), which attempts to extract the maximum wind power by using a linear perturbation observer.
Abstract: This paper designs a novel adaptive fractional-order PID (AFOPID) control of a permanent magnetic synchronous generator (PMSG) based wind energy conversion system (WECS), which attempts to extract the maximum wind power by using a linear perturbation observer. The combinatorial effect of generator nonlinearities and parameter uncertainties, unmodelled dynamics, stochastic wind speed variation is aggregated into a perturbation, which is then estimated in the real-time by a linear extended-state observer (ESO) called high-gain state and perturbation observer (HGSPO). Besides, the perturbation estimate is employed as an auxiliary control signal which is fully compensated by a fractional-order PID (FOPID) controller to achieve a globally robust control consistency, simple structure and high reliability, as well as an improved tracking performance compared to that of PID control. In addition, AFOPID does not require an accurate PMSG model while only the measurement of d-axis current and mechanical rotation speed is required, which parameter is optimally tuned by particle swarm optimization (PSO). Four case studies are carried out, including step change of wind speed, low-turbulence stochastic wind speed, high-turbulence stochastic wind speed, and generator parameter uncertainties, respectively. Simulation results verify the effectiveness and superiority of AFOPID compared to that of PID, FOPID, and nonlinear control.

63 citations


















Journal ArticleDOI
TL;DR: This review summarizes and updates the important aspects ofUVLS and provides principle understanding of UVLS, which are critical in planning such defense schemes and will serve as one‐stop information for power system engineers, designers, and researches.
Abstract: A blackout is usually the result of increasing load beyond the transmission capacity of the power system. One of the main reasons for power blackouts is voltage collapse. To avoid this problem, the proper corrective measures called load shedding is required. In critical and extreme emergencies, under voltage load shedding (UVLS) is performed as a final remedy to avoid a larger scale voltage collapse. Therefore, UVLS is considered state of the art to achieve voltage stability. This review summarizes and updates the important aspects of UVLS; it also provides principle understanding of UVLS, which are critical in planning such defense schemes. Moreover, this article provides a discussion on recent state-of-art UVLS schemes applied in various power industries. Additionally, the pros and cons of the conventional and computational intelligence techniques are discussed. It is envisioned that this work will serve as one-stop information for power system engineers, designers, and researches.