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Microgrid is a newly proposed organization of distributed generation system. It can operate in net-connected mode and islanded mode, when the operation switches between the two types of mode, the variety power will emerge. If this happens, the level of the system voltage will be fluctuating in a wide range, and the system frequency will also be fluctuating in an unacceptable range. The load power...
This paper analyzes the factors influencing the recovery process of a particular micro-grid (MG) following a short-circuit. The MG is supplied by a classical synchronous generator (SG), which performs the MG voltage regulation through its excitation system and by an induction generator (IG). The MG frequency is kept at a constant value by the use of dump load circuit (DL). Simulations are carried...
This paper discusses modeling of a micro-grid with PV-Wind-Diesel generator hybrid system and its operations. The PV system is modeled with a DC/AC inverter with a pre-defined Maximum Power Point Tracking (MPPT) control. Fixed speed induction generator based wind turbines are used to model the wind farm. The diesel generator controls are modeled with droop governor and automatic voltage regulator...
The frequency stability analysis in an autonomous microgrid (MG) with renewable energy sources (RES) is a continuously studied issue. This paper presents an original method for modeling an autonomous MG with a battery energy storage system (BESS) and a wind power plant (WPP), with the purpose of frequency stability analysis. A reduced order model is developed, considering only the dominant elements...
This paper reports the study of dynamic behaviour of an integrated distributed generation (DG) system comprising wind turbines (WTs), solid-oxide fuel cell (SOFC) and microturbine (MT) under variable loading profile. WTs coupled to permanent magnet generators (PMGs) are combined with the SOFC and the MT to meet the total load demand. The fluctuations in the output of the WTs due to wind speed variations...
This paper examines stability performances of a micro-grid application under both small and large disturbances, including islanding mode of operation. The system modeled encompasses dynamics and control of the doubly-fed induction generator, wind turbine, synchronous generator, and constant-power load. Fluctuation of wind speed is modeled using Weibull distribution. Simulated test results reveal that...
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