An Aggregated Frequency Response Model for Power Systems with Renewables

The continuous increase of renewable energy weakens the ability to maintain system frequency security, significantly changes system frequency response characteristics. This paper proposes an aggregated frequency response model considering renewable energy generation participation in the system frequency regulation. Firstly, virtual synchronous generators are assembled for renewable energy to simulate the inertia response and governor droop control of the synchronous generators. Then a multi-machine system frequency response model containing renewable energy is constructed and transformed into a single machine equivalent model for simplifying calculation using the equivalent aggregated method. Finally, the model proposed in this paper has been verified to be effective and accurate by using the IEEE 39-Bus system.