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

TL;DR

This paper analyzes and implements Dead-Zone Virtual Oscillator Control in isolated micro-grids, demonstrating its stability and performance improvements through simulations and real-time validation.

Contribution

It introduces a Dead-Zone VOC strategy with voltage control, analyzing its stability and compatibility in isolated micro-grids and PV-inverter systems.

Findings

Enhanced voltage droop profile with DZVOC

Stable operation in various micro-grid scenarios

Validated results through MATLAB Simulink and Typhoon HIL

Abstract

This paper explores the analysis and implementation of the Virtual Oscillator Control (VOC) strategy for inverters aiming to enhance stability amidst the ever-increasing generation of renewable energy sources like solar PV. Key objectives include implementation and analysis of a Dead-Zone VOC (DZVOC) three-phase battery-inverter system with an additional voltage control loop, study of its stability and performance in an isolated micro-grid and exploration of their use alongside widely used grid following PV-inverter system. By modeling independent microgrids under various cases with scenarios: VOC inverters of varying capacities and VOC inverters in conjunction with PV inverters, 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.