One of the main features Microgrids is ability to operate in both grid-connected mode and islanding mode. In each operation, distributed energy resources (DERs) can be operated under grid-forming or grid-following control strategies. mode, DERs usually work strategy, while at least one must strategy A microgrid may experience remarkable fluctuations voltage current due an unintentional event. To achieve a smooth transition mitigate disturbance effect, this paper proposes includes a) linear...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper describes a control approach applied on doubly fed induction generator (DFIG) to provide both voltage and frequency regulation capabilities, hence, an improvement in the dynamic behavior of microgrid system. The system is assumed be portion medium distribution feeder supplied by two distributed generation (DG) units, i.e., gas-turbine synchronous variable-speed wind turbine with DFIG....

Wind energy integration into microgrids, has introduced new challenges to management systems because of its intermittent behaviour. Owing continuous changes in generation and consumption, the price is volatile. This study proposes a two‐stage stochastic framework for day‐ahead scheduling microgrids. Uncertainties associated wind power generation, real‐time electricity load demand are considered. Different scenarios generated using autoregressive moving‐average method then reduced...

In this article, we prove a general theorem which establishes the existence of limiting distributions for wide class error terms from prime number theory. As corollary to our main theorem, deduce previous results Wintner [On asymptotic distribution remainder term Amer. J. Math.57 (1935), 534–538], Rubinstein and Sarnak [Chebyshev's bias, Experiment. Math.3 (1994), 173–197] Ng [The summatory function Möbius function, Proc. London Math. Soc. (3) 89 (2004), 361–389]. addition, establish in an...

The recent increasing penetration of plug-in electric vehicles (PEVs) has provided an opportunity to develop individual PEVs aggregators who benefit from coordinating the vehicles. Optimal self-scheduling such aggregator, considering network operation indices, and distribution system operator's (DSO's) policies on aggregator's performance are key issues investigated in this paper. proposed method maximizes daily profit through participating day-ahead real-time electricity markets offering...

In this paper, a new stochastic framework is proposed to study expansion planning problem of energy storage systems in microgrids, which contain renewable resources and responsive loads. Fluctuations on wind solar generation, microgrid islanding capability load's variations have considered as sources uncertainties, are modelled by sets scenarios. Reserve constrains cover nature uncertainties. Optimization prepared two-stage programming. Due presence discrete continues variables, mathematical...

Increasing the penetration of renewables on prosumers' side brings about operational challenges in distribution grid due to their variable and uncertain behavior. In fact, these resources have increased net load fluctuation during recent years. this article, flexibility-oriented stochastic scheduling a microgrid is suggested capture variability at level. scheduling, flexibility limits are set manage desirable level for main operator. The uncertainties considered, under control by risk-averse...

With the expansion of HVDC grids, short-circuit faults and their protection issues are among main challenges these networks, which should be given more attention. This article presents an investigation DC side fault current in grids during transient period. Also, a fast robust algorithm is introduced that essential for secure appropriate operation. The Short-Time Fourier Transform (STFT) applied to extract frequency components current, time features utilized as basis proposed algorithm. A...

Dual mode operation capability of distributed energy resources in microgrids is an attractive feature that makes these systems a promising solution for improving reliability and economy the power system. However, transition between microgrid modes (grid-connected islanding) may lead to significant deviation voltage current because inconsistency phase, frequency, amplitude. To minimize fluctuations provide smooth transition, this paper presents optimal control framework based on linear...

Doubly-fed induction generators (DFIG) are widely used in wind energy generation systems. During a grid voltage drop, performance is degraded with rotor over current deteriorating the fault-ride through (FRT) capability of DFIG wind-energy system. In this paper, complete mathematical model proposed. The considered fed by source converter whereas stator connected to directly. Output power and electromagnetic torque controlled using field-oriented control (FOC). Simulation results show...