Abstract
Operation of isolated systems with a large share of generation from renewable energy sources represents a real challenge from the aspect of system stability. The transition from conventional generation systems such as diesel generators and synchronous machines to renewable energy sources is especially challenging if the observed system is not electrically interconnected with neighbouring power systems. This paper investigates transient stability of the microgrid, which is predominantly powered by solar and wind power plants, following the set of the selected disturbances: three-phase short circuit at the connection point of the wind power plant, three-phase short circuit at the connection point of the solar power plant, and finally, the sudden cessation of generation from the solar power plant due to cloud coverage. System support is provided by battery energy storage systems, which are modeled using so- called grid-forming inverters. For the purpose of comparative analysis, the same disturbances were repeated, but this time the system support is provided by the conventional diesel generators. For the analysis of the mentioned disturbances, it is necessary to dynamically model all the elements, in order to show their behavior as accurately as possible and consequently their role in controlling the voltage and frequency in the system. The dynamic models used in simulations are taken from the library available in the used software DIgSILENT Power Factory, but have been updated according to the recommendations from the latest WECC (Western Electricity Coordinating Council) manuals. The main goal of this study was verifying the transient stability of an isolated microgrid powered by non-synchronous energy sources.
Published Version
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