Recursive Secondary Controller for Voltage Profile Improvement Based on Primary Virtual Admittance Control

This paper proposes a recursive, virtual admittance based, secondary controller for DG units that improves the voltage profile in distribution networks. First, adaptation of concept goal regulation is explained. Then, recursive developed to periodically update gains. The formulated as an optimization problem with current and stability limitations constraints. Measurements across grid, transmitted through low-bandwidth communications, are used simplify calculations, resulting algorithm. Weight vectors included objective function allow participation flexibility each converter. Results show primary able mitigate over- under-voltages steady state under transient conditions. Subsequently, shown further improve profiles grid. Experimental results obtained from laboratory environment, comprising three grid emulator, validate functionality complete control structure.