In this paper, the dynamic behavior and performance of an asynchronous generator used as a prime mover in wind turbines is analyzed and simulated when connected to an isolated (island) grid. Unlike large grids connected to the power system where voltage and frequency are almost constant and imposed by the main grid, there is no large backup source in isolated grids; therefore, the wind turbine generator itself will be responsible for providing voltage, frequency, and active and reactive power balance. These conditions cause specific challenges such as severe voltage and frequency changes due to wind fluctuations, heavy load startup, short circuit, or sudden load disconnection. In this study, the transient and steady-state behavior of the system in different operational scenarios has been investigated using MATLAB software Simulink, and the simulation results have been presented. The changes in various signals such as frequency, synchronous generator speed, and synchronous condenser reactive power have been shown along with Fourier analysis of the signals. The main objective was to evaluate the ability of the asynchronous generator to maintain voltage and frequency stability of the isolated network and to identify its limitations and weaknesses in such conditions.
Jelokhanian et al. (Sat,) studied this question.
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