Extended Virtual Inertia Control Design for Power System Frequency Regulation

According to the growing share of renewable energy and power electronic interfaces in power systems, the inertia/damping of power systems are critically decreased, which introduce the new stability issues, leading to system instability and power failures. Confronted with this problem, this research proposes an extended design of virtual inertia control based on a practical system to emulate inertia and damping properties simultaneously, improving system frequency stability and performance. The proposed control loop uses the derivative control technique, which creates a second-order characteristic, enabling higher-level application of inertia and damping into the system. The results show that the stabilizing effect of the presented technique is superior to the conventional virtual inertia control under different test scenarios including the reduction of system inertia and damping, load changes, and change in RESs penetration.