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By J F Herbst; International Federation of Automatic Control. Technical Committee on Applications

ISBN-10: 0080267092

ISBN-13: 9780080267098

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Extra resources for Automatic control in power generation, distribution, and protection : proceedings of the IFAC Symposium, Pretoria, Republic of South Africa, 15-19 September 1980

Sample text

Kurz and others ( 1 978) have shown that adaptive control al­ gorithms with good properties result by com­ bining RLS (recursive least squares ) RELS (recursive extended least squares) RML (recursive maximum likelihood) with DB (deadbeat) (minimum variance) . MV The assumption C ( z - 1 ) A ( z - 1 ) for the noise model simplifies the closed loop parameter estimation and the controller design consid­ erably . In general DB2 and MV3 are to be pre­ ferred because of the possibility to weight the process input by r or r ' .

A tion i n the de sign i s achieved by = ( 21 ) which are a noi se s imp l i fi ca­ assuming Power D igital Con trol Methods for C ( z- 1 ) = A (z - 1 ) . This leads to the (extended) minimum variance controller GMV3 (z) z B (z -1 ) F (z -1 -1 ) + br D (z ) l -1 -1 1 A (z- ) F (z ) + z - (d+l ) L ( z ) with F ( z- 1 ) (24) L ( z- 1 ) - (m- 1 ) + . . + lm- l z (25) For r = O the minimum variance controller follows GMV4 (z) L ( z-1 ) z B ( z- 1 ) F ( z- 1 ) ( 26 ) The poles of this controller may cancel the process zeros .

Poon e t a l . ���� 20 40 60 i Figure 7 : Dynamic response o f the (a� . 01 ... for 1 1 0 MW step demand increase Fig. 0} t ... c ... .. ;l -50 ! ] '" 0 20 40 60 60 (sec. ::;. j � .. 011 � v ! ; .. , c ... .. ... ; .. : 50 25 100 50 -5 e 1000) (a) frequency deviations (b ) tieline interchange deviations (c) area generation deviations ' Pc2 Fig . 7 ( c ) "' w Fig. , ... = in Area 2 � (aec . l-���� � o Figure 8 : Fig . B ( a ) Response of centralised AGC se rvocontroller to an " ELD- S " command t o shift 110 MW o f I spinning reserve to Area 2 ( parame ters as for Fig .

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Automatic control in power generation, distribution, and protection : proceedings of the IFAC Symposium, Pretoria, Republic of South Africa, 15-19 September 1980 by J F Herbst; International Federation of Automatic Control. Technical Committee on Applications


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