Stability in Isolated Grids: Implementation and Analysis of the Dead-Zone Virtual Oscillator Control in Simulink and Typhoon HIL

This paper explores the analysis and implementation of the Dead-Zone Virtual Oscillator Control (DZVOC) strategy for grid-forming inverters aiming to enhance stability amidst the ever-increasing penetration of renewable energy sources like photo-voltaic and wind. Key objectives include implementation and analysis of a DZVOC three-phase battery-inverter system with a voltage control loop on top, study of its stability and performance in an isolated micro-grid and exploration of their use alongside a grid following PV-inverter system with a hysteresis band current control. By modelling independent microgrids under various cases such as VOC inverters of varying capacities and a VOC inverter in conjunction with a PV inverter, this research addresses critical aspects of power-sharing, compatibility, response times, and fault ride-through potential, as well as improving the voltage droop profile of a general DZVOC control. The simulation is executed in Matlab Simulink and validated with real-time simulation using the Typhoon-HIL 404.