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

By K.R. Padiyar

4. 2 research of induction generator impression: frequency scanning process 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 a hundred and twenty 121 five. INTERACTIONS WITH strength method STABILIZER five. 1 creation 121 five. 2 easy thought 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 creation 137 6. 2 HVDC converters and regulate 138 6. three Modelling of HVDC method for learn of torsional interactions 147 6. four research of torsional interactions -A simplified process 153 6. five A case learn 156 6. 6 A simplified damping torque research 161 6. 7 regulate 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 two hundred eight. INTERACTIONS WITH sequence COMPENSATORS 205 eight. 1 advent 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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It is assumed that the base frequency is same for all the coils. /. / tj IB ). The base current and flux in coil are defined as IB and 'lj;B dropping the subscript 1. 59) suggests the possibility of first referring the quantities to coil 1 using turns ratio (if specified) and then expressing them in per unit with respect to the base quantities defined for coil 1. 60) where Remarks 1. If turns ratios are known, the base currents (and fluxes) for coil j (j=2,3 ... n) are defined in terms of the base quantities for coil 1 and the turns ratios.

In general, the vectors of matrix [Q] are not orthogonal. 4. 134) 5. The column vectors of the matrix [Q] are also called as mode shapes. The elements of a vector determine the participation of different masses (in relation to that of the generator rotor) in a particular mode of torsional oscillations. 6 State equations The state equations for the mechanical system can be expressed either based on (a) coupled multimass model or (b}decoupled modal model. Both approaches will be illustrated by taking an example of a four mass system made up of High Pressure (HP), Intermediate Pressure(IP), Low Pressure (LP) turbines and the generator rotor.

4 3 2Laa2 = Lq 3 + 2Laa2 = Laao - LabO Choice of constants kd , kq and ko The transformation [Cp ] defined by Eq. 18) is most general as no assumptions are made regarding the constants kd , kq and ko . S. of Eq. e. 49) The major advantage of a power invariant transformation is that the mutual inductances in the transformed network are reciprocal. For example, Md'J VI, = MkdaJ and M Jd = 2"3 M aJ k d MdJ = MJd = ftMa J For kd = In what follows, we will use a power invariant transformation by selecting the following values kd = /J = k q, ko = If As mentioned earlier, the positive value of kq indicates that q-axis is lagging the direct axis, whereas in the original transformation by Park, q-axis is assumed to lead d-axis.

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