Coordination of Utility-Scale PV Plant and Wind Power Plant in Interarea-Oscillation Damping

This article proposes a coordinated control scheme of a utility-scale photovoltaic (PV) power plant and a wind power plant (WPP) to support voltage stability and provide fast recovery after the grid faults in a power system with high penetration renewable energy sources (RES). The operation of PV and wind plants are time-shifted by approximately twelve hours. PV generates during the daytime, and wind plants usually produce peak power at night. Seasonally, the PV plants generate peak power on summer days, and wind plants produce maximum power during winter nights. These characteristics present an opportunity to use both types of renewables to complement each other in producing power and transforming energy, and also in providing active damping to safeguard the power system. To achieve these goals, two separate power oscillation damping (POD) control loops have been included for active and reactive power modulation in both PV and WPP. In both PV and WPP, an active power damping function without any power curtailment and a reactive power damping function modulating the reactive current (
I
_Q
) on the voltage control loop have been included. This article uses the nearest synchronous generator's local bus angle and speed as feedback for each of these loops. The performance of the proposed coordinated scheme based on the time of the day has been verified in a two-area system using the PSCAD simulator. The effectiveness of the control schemes has been investigated during the different timings of the day by observing the efficiency and the response time of the post-fault oscillations mitigation and the voltage restoration.