Enhanced Non-linear PID-Based on Virtual Inertia Control to Enhance the Frequency Stability of a Hybrid Power System

The loss of system inertia caused by the replacement of conventional generating units with a high number of renewable energy sources (RESs) has an unfavorable impact on the power system's frequency stability, resulting in the power system's weakening. A low inertia hybrid power system may have a high frequency oscillation and have a real challenge to maintaining frequency stability under different operating conditions. To enhance the single area hybrid power system's frequency stability and save it from blackout, this paper introduces Enhanced Nonlinear PID (ENLPID) based on virtual inertia control (VIC) for a single area hybrid power system with a high contribution of RESs. The ENLPID based on VIC has a great effect in enhancing the frequency stability of the studied hybrid power system. This effect is remarkable in saving the frequency stability, improving the frequency response of the system. To achieve the optimal parameters of the ENLPID based on VIC, the particle swarm optimization (PSO) technique is used.