A novel control strategy for PV system participating in frequency regulation

What is it about?

A novel control strategy is proposed for the two-stage three phase PV system participating in frequency regulation considering changing operation conditions. Specifically, the DC-link voltage control is developed to mimic the inertia characteristic via utilizing the energy stored in the DC-link capacitor. In addition, PV systems operate at a deloading mode under normal operation to offer power reserve and the designed droop control enables PV systems to offer primary frequency regulation support. Considering the uncertainty characteristic of solar power production, the droop gain is adaptively adjusted according to the primary reserve capacity.

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Why is it important?

With the increasing penetration of renewables, severe challenges occur towards frequency regulation in power systems. In this context, it is necessary to enable solar system participate in system frequency control. Our proposed control could enable solar system contribute inertia response. In addition, it could contribute primary control reserve for system.