A DESIGN METHOD OF ADAPTIVE LOAD FREQUENCY CONTROL WITH DUAL-RATE SAMPLING

An adaptive control strategy for load frequency control, the purpose o f which is to reduce the transient errors in the frequency and schedul ed tie-line power deviations and to ensure zero steady state errors of these two quantities, is described. A dual-rate sampling self-tuning regulator whereby data sampling and control output are performed at di fferent rates is designed for interconnected power systems with unknow n deterministic load disturbances. The proposed control scheme is appl ied to a two-area power system provided with reheat thermal turbines a nd the control effects of the regulator are examined using digital sim ulation.