By K.R. Padiyar

4. 2 research of induction generator impact: frequency scanning approach 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 a hundred and twenty 121 five. INTERACTIONS WITH energy approach STABILIZER five. 1 creation 121 five. 2 easy thought 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 keep watch over 137 6. 1 creation 137 6. 2 HVDC converters and regulate 138 6. three Modelling of HVDC procedure for examine of torsional interactions 147 6. four research of torsional interactions -A simplified strategy 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 advent 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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4 ANALYSIS OF SUBSYNCHRONOUS RESONANCE IN POWER SYSTEMS PER UNIT QUANTITIES It is common to express voltages, currents and impedances in per unit by choosing appropriate base quantities. The advantages of an appropriate per unit system are 1. The numerical values of currents and voltages are related to their rated values irrespective of the size of the machine. 2. The per unit impedances on the machine base lie in a narrow range for a class of machines of similar design. 3. The number of parameters required is minimized.

9. The equations for this excitation system are given below. 9. Simplified block diagram of a static excitation system The signal Va is the output of Power System Stabilizer (PSS). The modelling of PSS is considered in chapter five. 1 MODelLING OF TURBINE GENERATOR MECHANICAL SYSTEM General The rotor of a Turbine Generator (T-G) unit is a complex mechanical system made up of several rotors of different sizes, each with mechanical shaft sections and couplings. Turbine sections contain a number of discs which may be integral or attached to the rotor.

AVR stands for Automatic Voltage Regulator while ESS stands for Excitation System Stabilizer. PSS stands for Power System Stabilizer which acts on a control signal derived from rotor speed to damp low frequency oscillations of the generator rotor. 8. Functional Block diagram of excitation control system There are three distinct types of excitation systems based on the power source for the exciter. 1. DC excitation system(DC) which utilizes a DC generator with commutator. 2. AC excitation system(AC) which uses alternators and either stationary or rotating rectifiers to produce the direct current for the field.