Abstract
This paper proposes a “grey-box” dynamic equivalent model for medium voltage active distribution networks, taking into account a heterogeneous fleet of generation technologies alongside the latest European grid codes requirements. It aims to properly represent the transient behavior of the system upon large voltage disturbances in the transmission side. The proposed equivalent model is composed by four main components: two equivalent generation units, one for converter-connected units’ representation, and another accounting for the synchronous generation units’ portfolio; an equivalent composite load model; and a battery energy storage system, also converter-connected to the grid. The model’s parameters are estimated by an evolutionary particle swarm optimization algorithm, by comparing a fully-detailed model of a medium voltage distribution network with the equivalent model’s frequency domain’s responses of active and reactive power flows, at the boundary of distribution-transmission interface substation.
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