Abstract
As the grid-connected solar power system grows rapidly, virtual inertia control strategy (VICS) becomes crucial to enable stable grid integration. However, the existing VICS is lack of dynamic weather analysis with maximum power point tracking (MPPT) and fault-ride through (FRT) capabilities such as low voltage ride through (LVRT) and high voltage ride-through (HVRT). In this paper, the proposed adaptive VICS with variable moment of inertia (J) and damping factor (DP) demonstrates its effectiveness with faster frequency recovery, less overshooting and continuous stable operation under grid fault and dynamic weather. Case studies have been conducted in MATLAB®/Simulink simulation to demonstrate the feasibility of the proposed VICS. The frequency nadir has been improved by at least +0.95 Hz (+1.9%) compared to the conventional inverter and PI-based synchronverter. The simulation results are validated and verified by the emulated hardware based on Typhoon® Hardware-In-Loop (HIL) 402 real-time simulation. Overall, the proposed VICS is able to operate in stable condition by regulating grid frequency (fg) and voltage (vg) under varying irradiance and temperature, voltage sag/surge, sudden load changes and overloading conditions.
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