By K.R. Padiyar

ISBN-10: 1461375770

ISBN-13: 9781461375777

ISBN-10: 1461556333

ISBN-13: 9781461556336

4. 2 research of induction generator impression: frequency scanning strategy eighty three four. three research of torsional interaction(TI) 87 four. four nation equations and eigenvalue research ninety six four. five An set of rules for computing torsional modes 108 four. 6 Countermeasures for SSR III four. 7 Torsional oscillations in parallel hooked up turbine turbines one hundred twenty 121 five. INTERACTIONS WITH energy approach STABILIZER five. 1 advent 121 five. 2 simple proposal within the program of PSS 122 five. three layout of PSS 126 five. four Torsional interplay with PSS one hundred thirty five. five A case examine 132 6. INTERACTIONS WITH HVDC CONVERTER regulate 137 6. 1 creation 137 6. 2 HVDC converters and keep watch over 138 6. three Modelling of HVDC approach for examine of torsional interactions 147 6. four research of torsional interactions -A simplified technique 153 6. five A case examine 156 6. 6 A simplified damping torque research 161 6. 7 regulate of torsional interplay 167 7. INTERACTIONS WITH SHUNT COMPENSATORS 169 7. 1 creation 169 7. 2 Static Var Compensator 171 7 . three Torsional Interactions with SVC 186 7. four Static Condenser(STATCON) 189 7. five Torsional interactions with STATCON 196 7. 6 A simplified research of torsional interplay with voltage controller two hundred eight. INTERACTIONS WITH sequence COMPENSATORS 205 eight. 1 creation 205 eight. 2 Thyristor managed sequence Compensator 206 eight. three Modelling of TCSC for SSR reports 216 eight. four Mitigation of SSR with TCSC 223 eight. five Static Synchronous sequence Compensator (SSSC) 229 8.

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The per unit inductances are identical to per unit reactances. 3. In general, Xfh xdf = Xdh = Xde "# Xad. = Xde = Xdh However, Canay (1983) showed that if = Xd - Xc, = xdf where Xc is the per unit characteristic reactance, then Xfh 4. The use of Bfd (instead of vf) is convenient as, in steady state, the open circuit voltage at the terminals of a synchronous machine is Bfd . 5. In what follows, the per unit quantities will be used and denoted (for convenience) without placing any bar on the symbols.

Hence the self inductance matrix of rotor coils is not altered. 4. Eq. 22) shows that stator coils 'a','b' and 'c' are replaced by fictitious 'd', 'q' and '0' coils from Park's transformation. Out of these, '0' coil (in which zero-sequence current io flows) has no coupling with the rotor coils and may be neglected if io = O. Since the (transformed) mutual inductance terms between d,q coils and the rotor coils are constants, it can be interpreted that d and q coils rotate at the same speed as the rotor.

Tm is the net mechanical torque produced by the prime mover. FHP, FIP and FLP are the fractions of the mechanical torque (or power) produced by HP, IP and LP turbines respectively. It is assumed that initial slip (Smo) is zero. 143) where Am is a matrix of order 2m x 2m where m is the number of masses, Bml and Bm2 are column vectors of order 2m. State Equations Using Modal Quantities As mentioned earlier, it is possible to transform the system equations into decoupled form using modal inertias, spring constants and damping parameters.

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