Control in power electronics and electrical drives : by Werner Leonhard; VDI/VDE-Gesellschaft Mess- und

By Werner Leonhard; VDI/VDE-Gesellschaft Mess- und Regelungstechnik

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Extra resources for Control in power electronics and electrical drives : proceedings of the second IFAC symposium, Düsseldorf, Federal Republic of Germany, 3-5 October 1977

Example text

C. voltage I absolute value ii i , ii blocks all the diodes. By increasing the voltage vector < o, simulation program the border conditions for UN c = Ux Uy {3 V3 2-2uP u u V3 V_r:_ 3 = 22 +� 2 <0 tends to step out begin conducting and an other conduction pattern is established. In the case of thyristors the condition for Pa and Nb is that the voltage vector be on the other side of the straight line PaNb . u are to be checked if the bridge is built up of diodes: from the hexagon. g. -= · By knowing that the vectors are varying in the positive rotation sense, the second condition may be dropped out.

From simi l a r reasons i t shoul d be opportune to cho i ce a re ference frame fi xed on the roto r , t h a t can be rea l i zed by i ntroduc i ng as i nput s i g n a l cuo the rota t i ng speed s i gnal cu r . Another poss i b i l i ty cons i s ts i n a cho i ce whi ch sha l l produce el ectri cal quanti ti e s h a v i n g constant v a l ue i n s teady operat i ng condi tion wi th s i nusoidal constant frequency i nput vol ­ tages . That cond i ti o n i s obta i na�l e wi th a speed wo hav i ng constant value equal to the one of a spati al vector produci ng the s a m e total rotati ng ang l e o f the vector Vs ; that 33 Generalized hybrid computer t e chnique cond i t i on may be equ i val ent to the o ther of refe rence frame fi xed on the rotor for a s tea ­ dy opera t i ng synchronous mach i ne .

A s exampl e i n fi g . s , Mar i o Lazzari and Franco Vi l lata 32 the pos i ti on of the vector Vs ( r , t ' , s , r ' , t , s ' ) a s a function o f the output termi na l s po ­ tenti a l , whi ch i s supposed assumi ng the v a l ues 0 and E ; i t i s al so repo rted the correspond i• ng modul e v a l ue . ·� Us Q S'o - V,senos r· fig . l 0 0 r t' s r' t s' V s= O R E E 0 0 E 0 E s 0 0 E E E 0 0 0 E 0 0 E E E T 0 0 E I n the b l ock C of fi g . s · The transfor�ation i s real i ­ zed by uti l i z i ng al so the l og i ca l output s i ­ gnal o f the bl ock D whi ch produces the c l a s s i ­ fi cation of the angl e o o by defi n i ng i ts po­ s i ti on wi th respect to s i x a ngu l a r i n terval s obtai ned by d i v i d i ng the ra nge - 1 80 , + 1 80 .

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