Special Session: Delay-Dependent Stability Analysis of Coordinated Voltage Control of a PV Park

Communication-based coordination between power converters in a PV park aims at faster response to voltage and frequency events and improved transient response. However, communication introduces significant delays that reduce the ability for fast respond, decrease stability margin and degrade performance. Accurate analysis of its impact on stability becomes increasingly complicated as the number of converters increases. This paper presents a method for accurate and computationally efficient delay-dependent stability analysis for high-dimensional model of multi-converter PV parks in time-domain, based on the reduced-order Discretized Lyapunov Functional (DLF) method, a variant of Lyapunov-Krasovskii Functionals.