Application of Soft-constrained Differential Games Theory to Robust Load Frequency Control

The high penetration of renewable energy sources in power systems will deteriorate power quality and affect frequency stability. This issue is more severe in a small-capacity area or island power system that is weakly linked to the main grid. For the deviations of frequency and tie-line power exchange in power systems with multi-source generation units, we proposed a new robust control strategy based on linear quadratic soft-constrained differential games theory to reduce the influence from variations of wind farms output. The results of simulation testify its effect and robustness.