Frequency stability control of sending-end power grid with multiple resources

High shares of renewables and power electronics (“double-high”) have become the main development trends for future power systems. In this context, power systems will face the practical problem of insufficient inertia and frequency regulation capability. This paper investigates frequency stability enhancement of the sending-end power grid by incorporating regulation capabilities of multiple resources. Based on power flow and transient calculation data, an equivalent model of frequency response for a practical power grid is established and validated. The frequency response under different scenarios considering various disturbance and renewable output scenarios is conducted, taking into account the simultaneous participation of resources such as direct current frequency limit control, energy storage, and renewables of different scales in frequency regulation to improve frequency stability and mitigate the risk of renewables trippings. Simulation results indicate that incorporating the potential frequency regulation capabilities of multiple resources into “double-high” frequency control strategy plays an important role in improving transient frequency response, reducing the risk of renewable tripping, and enhancing frequency stability margins.