On the estimation of transient state of power system by discrete nonlinear observer

Abstract

H. TAKATA S.NAKAGAK1 Kyushu I n s t i t u t e o f TechnologyKitakyushu, Japan S.TAKATA, Member IEEE This paper presents a new nonlinear observer ( extended linear observer ) w h i c h e s t i m a t e s t h e t r a n s i e n t state of power system. The t r a n s i e n t s t a t e of the power system is represented as a continuous time nonlinear d i f f e r e n t i a l e q u a t i o n and observation of output is obtained as a d i s c r e t i z e d v a l u e a t every cycle of system frequency by using the mean v a l u e d e t e c t i n g c i r c u i t device, The n o n l i n e a r . d i f f e r e n t i a 1 e q u a t i o n of state is d i s c r e t i z e d a t e a c h o b s e r v a t i o n i n s t a n t by Taylor expansion, and then the theory of discrete linear observersis a p p l i e d t o t h e d i s c r e t i z e d system. D i g i t a l computer simulation confirms that the observer estimates t h e state s u c c e s s f u l l y n o t o n l y in t h e case of hunting b u t a l s o i n s t e p -o u t t r a n s i e n t state of a synchronous machine,

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