H∞ Robust Speed Control of Single-Shaft Microturbines Under Load Disturbances and Thermodynamic Uncertainties

Microturbines are widely used in distributed generation, combined heat and power (CHP) systems, and grid-support applications, where precise speed/frequency regulation is essential under highly variable loads and significant thermodynamic parameter uncertainties. This paper proposes a low-order H∞ robust controller for single-shaft microturbines that systematically addresses both exogenous load disturbances and endogenous parametric uncertainties (e.g., variations in compressor/turbine efficiencies, heat losses, and rotational inertia). The controller is synthesized using mixed-sensitivity loop-shaping combined with μ-analysis to guarantee robust stability and performance across the entire operating envelope. Closed-loop simulations under severe load steps, rapid frequency demands, demonstrate excellent disturbance rejection and setpoint tracking with minimal overshoot and settling time. Comparative results show that the proposed H∞ governor considerably outperforms conventional PID controller in terms of robustness, transient response, and steady-state accuracy, making it highly suitable for practical microturbine applications in modern power systems.

کلیدواژه ها:

H∞ ، PID ، Robust control ، Load Disturbances ، Microturbines ، Robustness