A novel controller for frequency regulation in a hybrid system with high PV penetration

In high penetration scenario of renewable, it is important that these sources contribute to the frequency control of power system. This paper investigates the frequency control aspects of an hybrid system with photovoltaic generation and conventional generators. A multi bus system with two conventional generators and twelve PV systems which are working away from the maximum power point of operation is the system used for the study. Frequency control contribution of the deloaded PVs with frequency control is simulated and the dependency of output power on the control parameters is shown with the help of simulations done on DigSILENT platform. An improved controller which considers not only the frequency deviation of the system but also the available reserve in the photovoltaic is proposed. This ensures that the PV with more reserve will participate more in the frequency control compared to those with less reserve so that distribution of the reserve over the different generators is achieved.