Abstract
In this study, a novel control topology based on the BATS Echolocation Algorithm is utilised to enable successful integration of voltage source converters (VSCs) in weak grids. A linear power-damping and synchronising controller, consisting of two major sections, automatically synchronises a VSC to a grid by supplying damping and synchronising power components, and enables effective full power injection even under very weak grid circumstances. For frequency and angle regulation, the controller employs cascaded angle, frequency, and power loops. The controller simulates the dynamic behaviour of synchronous machines, making grid integration easier and providing a virtual inertia control framework for VSCs to dampen power and frequency oscillations. While the linear controller provides stable and smooth operation in many circumstances, it cannot guarantee system stability in weak grids when big unexpected shocks quickly shift system dynamics to the nonlinear zone. To overcome this complexity, the BATS Echolocation Algorithm-based controller was created to assist the linear controller and improve system performance in the face of large-signal nonlinear disturbances such as self-synchronization, disturbances in grid frequency and angle, high power injection in very weak grids, and fault-ride-through conditions.
Keywords: - Power Damping, DG; VSC; PV Arrays
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