LQI-Type Load-Frequency Control with First-Order Sampling Holder under Consideration of Generation Rate Constraints

ABSTRACT

In previous paper, the authors proposed a new method of designing discrete-type load-frequency regulator with a first-order sampling holder which improves control performance against rampwise load disturbances.However,the discrete-type optimal control gains are decided by neglecting the significant system nonline-arities, i.e. generation rate constraints (GRC( from the mathematical model. In this paper, we modify the earlier discussion in order to consider the effects of GRC and derive the effective regulator which can act satisfactorily even in the presence of GRC.The control effects by the proposed regulator are examined using digital simulations of a two-area system provided with nonreheat type turbines.