Wide-area damping controller design of large-scale PV power plants in interconnected power systems

Abstract

High penetration of photovoltaic (PV) generation has become a reality in many power systems. The impacts of large-scale grid-connected PV on low frequency oscillation stability cannot be ignored. This paper presents a method for the wide-area damping controller design for the suppression of inter-area oscillation using auxiliary signals in PV controller. Firstly, the capability of low frequency oscillation suppression using PV is investigated. Then a low order damping controller for inter-area oscillation suppression is designed based on phase compensation. Dominant mode ratio (DMR) is also employed to select the optimal feedback signals of supplementary controller. Finally, a simulation model of two-area four-generator system with a large-scale grid-connected PV power plant is established. The effectiveness of damping controller is validated both from the results of eigenvalue analysis and time domain simulations.