By K.R. Padiyar

4. 2 research of induction generator influence: frequency scanning technique eighty three four. three research of torsional interaction(TI) 87 four. four country 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 attached turbine turbines one hundred twenty 121 five. INTERACTIONS WITH energy method STABILIZER five. 1 advent 121 five. 2 easy proposal within the software of PSS 122 five. three layout of PSS 126 five. four Torsional interplay with PSS a hundred thirty five. five A case learn 132 6. INTERACTIONS WITH HVDC CONVERTER keep an eye on 137 6. 1 advent 137 6. 2 HVDC converters and keep an eye on 138 6. three Modelling of HVDC approach for examine of torsional interactions 147 6. four research of torsional interactions -A simplified method 153 6. five A case learn 156 6. 6 A simplified damping torque research 161 6. 7 keep an eye on 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 2 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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1, Mag and Mak are positive. These terms are negative only if q-axis is assumed to be leading the d-axis. Hence, if d-axis is assumed to lead q-axis, it would be convenient to choose positive value of kq. 3. Note that there is no transformation of the rotor currents and flux linkages. 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.

6. If the operating frequency is same as the base frequency, the per umt m~uctances a~e identical_ to per unit corresponding reactances. Thus Xd = Ld, XdJ = MdJ, Xad = Lad etc. 2 Rotor base quantities The base power and frequency are same as for the stator circuits. The base currents for the rotor circuits in the d-axis are chosen such that the base field current or base d-axis damper current (in h coil) produces the same mutual flux (in the air gap) as produced by the base current flowing in the stator d-axis 32 ANALYSIS OF SUBSYNCHRONOUS RESONANCE IN POWER SYSTEMS coil.

Anderson and Fouad (1977) use different base quantities for voltage and current along with power-invariant Park's transformation. They define VB as (rms) rated line to neutral voltage and IB as rms line current. Although this results in identical base impedance as defined before, the per unit voltages, currents and fluxes are different which leads to different equations using inconvenient factors (of )3). 4. The choice of base quantities for the rotor is related to the choice of stator base quantities.

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