____ A b s t r a c t -Hydro-Quebec has s t u d i e d many a l t e r n a t i v e s f o r i m p r o v i n g t h e t r a n s i e n t performance o f t h e i r l a r g e power system. c e , o r adding s e r i e s compensation t o t h e i r major 735 kV l i n e s and making t h e system work i n c o n j u n c t i o n w i t h a s m a l l e r number o f S V C ' s . This paper r e p o r t s on t h e SVC c o n t r o l s t a b i l i t y s t u d i e s undertaken as p a r t o f t h a t o v e r a l l system improvement p r o j e c t . --Keywords: S t a t i c -V a r Compensators, S e r i e s Compensat i o n , C o n t r o l S t a b i l i t y . E i g e n v a l u e A n a l y s i s ___-INTRODUCTION S t a t i c VAR Compensators (SVCls) i n many l o c a t i o n s a r e key elements f o r m a i n t a i n i n g t h e s t a b i l i t y o f t h e Hydro Quebec (H-Q) t r a n s m i s s i o n system. Rapid response t o v o l t a g e d e v i a t i o n i s i m p o r t a n t f o r t h e SVC's t o p r o v i d e such b e n e f i t s , b u t i s l i m i t e d by cons i d e r a t i o n s o f s t a b i l i t y w i t h i n t h e SVC v o l t a g e -c o nt r o l loop. A s t u d y was undertaken t o d e t e r m i n e t h e maximum response r a t e w h i c h c o u l d reasonably be expected f o r t h e SVC's i n t h e v a r i o u s new network designs b e i n g c o n s i d e r e d f o r i m p r o v i n g t h e Hydro Quebec transm'ission system [1,2]. An i m p o r t a n t a s p e c t o f SVC c o n t r o l s t a b i l i t y i s i n t e r a c t i o n w i t h t h e many resonances o f t h e t r a n s m i ss i o n network. This a s p e c t had been observed i n t h e e a r l y s t u d i e s o f SVC a p p l i c a t i o n t o t h e H -Q network [3,4], and has a l s o been s t u d i e d by GE i n an E P R I r e s e a r c h p r o j e c t [5]. I n a d d i t i o n t o t h e resonances a s s o c i a t e d w i t h shunt c a p a c i t a n c e on t h e t r a n s m i s s i o n system ( s h u n t -c a p a c i t a n c e resonance modes), i n t e r a ct i o n s w i t h HVDC systems and w i t h s e r i e s c a p a c i t o r s were o f concern i n t h e u p g r a d i n g o f t h e network. This s t u d y i n v e s t i g a t e d these issues, t h e key r e s u l t s o f which a r e expected t o be o f i n t e r e s t t o t h e i n d u s t r y . OBJECTIVES The p r i m a r y o b j e c t i v e s o f t h i s p r o j e c t were t o : 1. Determine t h e b e s t a d j u s t m e n t f o r t h e SVC v o l t a g e r e g u l a t o r s . This means p r o v i d i n g maximum a c h i e va b l e r a t e -o f -r e s p o n s e , w h i l e r e m a i n i n g s t a b l e f o r major c o n t i n g e n c i e s . I d e n t i f y p o t e n t i a l problems w i t h adding s e r i e s compensation, c o n s i d e r i n g i n t e r a c t i o n s w i t h t h e SVC's, and i d e n t i f y SVC c o n t r o l m o d l f i c a t i o n s which c o u l d improve performance. I d e n t i f y p o t e n t i a l problems due t o i n t e r a c t i o n s between t h e SVC's and t h e HVDC systems. APPROACH Two d i f f...
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