# Southeast Asia Hydropower Station Weak Grid VSG Energy Storage Support A 3 MW virtual synchronous machine provides inertia for the weak grid, reducing frequency deviation by 41%. The regional grid is dominated by hydropower and relies on diesel backup during the dry season, resulting in pronounced frequency fluctuations. The project deployed 3 MW of grid-forming energy storage using virtual synchronous machine (VSG) control. Results Provides inertia and voltage support for the weak grid Frequency deviation reduced by 41% Diesel generator start/stop cycles reduced by 70%