Download Analysis of Subsynchronous Resonance in Power Systems by K.R. Padiyar PDF

By K.R. Padiyar

4. 2 research of induction generator influence: frequency scanning strategy 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 hooked up turbine turbines a hundred and twenty 121 five. INTERACTIONS WITH energy method STABILIZER five. 1 advent 121 five. 2 uncomplicated notion within the program 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 watch over 137 6. 1 creation 137 6. 2 HVDC converters and keep watch over 138 6. three Modelling of HVDC method for learn of torsional interactions 147 6. four research of torsional interactions -A simplified technique 153 6. five A case learn 156 6. 6 A simplified damping torque research 161 6. 7 keep watch over 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 reviews 216 eight. four Mitigation of SSR with TCSC 223 eight. five Static Synchronous sequence Compensator (SSSC) 229 8.

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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. The length of the rotor system may extend over 50 m and weigh several hundred tons. The system also has a number of smaller components including turbine blades, rotor coils, retaining rings, blowers and pumps.

As mentioned before, the revised convention is adopted here. 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.

_ d~. )i. lr = v. 8) where v; [ Rs [ Ra 1= ~ [ Rr 1 0 = [-vJ 0 0 0) 0 ~a ~a [f 0 Rh 0 0 0 0 Rg 0 0 0 0 Rk 1 [U3 ) is a unit matrix of dimension 3 Note: Generator convention is used in expressing the voltage equations. The currents are assumed to be leaving the coil at the terminals and the terminal voltages are assumed to be voltage drops in the direction of the currents. This is contrary to the motor convention (see Fig. 2) Because ofthe generator convention, the sign associated with vJ is negative (to sustain a field current in steady state).

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