Advanced Damping Control Using Wide-Area Measurement Incorporating Communication Delay and Renewable Energy Sources

Abstract

State-of-art power systems are progressing rapidly due to the advent of converter-interfaced power generation. Power system stabilizers are commonly employed in synchronous generators to damp low-frequency oscillations. However, many of these generators have been decommissioned by converter-interfaced generations. This means that converter-interface-based wind and solar power plants should also commit to oscillation damping. In addition, renewable generators may be coordinated with power system stabilizers to enhance the damping. This paper recommended a new advanced design of damping control system using wide-area signal with converter-interfaced generations. The major contribution of this work is to improve the damping of low-frequency oscillations while keeping the frequency in the specified range taking into account renewable energy sources. This paper introduced a mixed H2/H∞ using non-convex optimization utilized to design damping controllers for renewable integrated power systems to secure system operation against low-frequency oscillation modes. This multi-objective control design permits for more reliable and precise specification of the recommendable closed-loop behavior. The proposed robust controller is tested on grid-forming wind turbine type-III DFIGs and generic dynamic PV plants integrated large study power systems, whereas robustness is evaluated against several perturbations and communication delay through dynamic simulation.

Keywords

• Low frequency oscillations
• Mixed ℋ2/ℋ∞
• Optimization
• converter-interfaced power generation
• robust controller
• time-delay