Simulation Model of Grid-Connected Inverter Based on Droop Control

This simulation model implements active power-frequency (P-f) and reactive power-voltage (Q-V) droop control methodologies. The P-f droop control regulates inverter output power by adjusting its frequency, which is critical for grid-support functions as it enables voltage and frequency stabilization in grid-connected operations. The control algorithm typically involves a proportional controller where frequency deviation (Δf) is calculated based on power mismatch, implemented through a feedback loop with gain adjustment. Conversely, Q-V droop control manages reactive power by modulating the inverter's voltage output, effectively improving power factor and enhancing system efficiency and stability. This is commonly achieved through voltage reference generation using reactive power error signals and PI controllers. By integrating both control strategies with appropriate weighting coefficients and protection logic, the model achieves comprehensive grid-connected inverter regulation while ensuring high-efficiency and stable operation under varying load conditions.