Adaptive Voltage Control to Coordinate Multiple PV Inverters as a Cluster

Abstract

Dynamic voltage support is a critical ancillary service in electric power networks, and with the increasing penetration of inverter-based renewable energy resources such as solar photovoltaics (PV), utilizing their idle capacity to provide dynamic voltage support is becoming indispensable. This paper proposes an adaptive voltage control method to coordinate multiple PV inverters as a cluster, realizing dynamic voltage support without relying on accurate system model parameters. Based solely on the measured input/output data of the controlled system, the proposed method dynamically linearizes the controlled system through online identification. Subsequently, a data-driven cooperative adaptive controller is designed to coordinate multiple PV inverters as a cluster. The method can effectively regulate the voltage at the point of common coupling (PCC) of the controlled PV cluster with adaptability to system changes. The stability of the proposed control method is theoretically clarified. Numerical simulation using MATLAB/Simulink shows the effectiveness of the proposed method.