Resumo:
The growing integration of wind and photovoltaic power plants into electrical power
systems has transformed the global and national energy matrix, bringing new challenges
to the planning of the operation and expansion of Bulk Power Systems (BPS). The high
participation of these non-dispatchable sources, known as Inverter-Based Generators (IBGs),
requires the adaptation of grid procedures and expansion criteria, originally designed for
the predominance of synchronous generators. In this scenario, entities such as WECC and
EPRI have developed generic dynamic models that allow the behaviour of these plants and
also of storage systems (BESS) to be represented in electromechanical stability studies,
enabling more realistic analyses and supporting the evolution of network procedures. From
a dynamic point of view, there are characteristics common to wind, photovoltaic, and
BESS plants that also permeate the SEPs to which they are connected, such as: reduction
of equivalent inertia and short-circuit power of the SEP, rapid response of inverters, and
ability to provide synthetic inertia through IBG-based resources. In this context, this
dissertation investigates Root Mean Square (RMS) transient evaluations in electrical
systems, applying the WECC’s generic dynamic models and emphasising the system’s
frequency response, with a focus on the use of synthetic inertia in a practical case. The
case study is structured based on a real subtransmission system, whose simulations were
performed in the ANATEM programme, considering academic methodological freedom.
