Research Article
A Comparative Study of Static VAR Systems for ImprovingVoltage Stability in Expansion of Mining Projects with Gearless Motor Drives
Table 4
Synchronous motors characteristics.
| | Names | M 1, M4 | M 2, M3, M5 |
| | Power (MVA) | 20 | 14.2 | | Nominal speed (rpm) | 9.3 | 11.5 | | Moment of inertia (kg·m2) | 34000000 | 27000000 | | Synchronous reactance d-axis nonsaturated Xd (p.u) | 0.89 | 0.93 | | Transient reactance d-axis nonsaturated Xd´ (p.u) | 0.34 | 0.37 | | Synchronous reactance q-axis nonsaturated Xq (p.u) | 0.7 | 0.77 | | Subtransient reactance q-axis nonsaturated Xq´´ (p.u) | 0.7 | 0.76 | | Damper circuit time constant in d-axis nonsaturated Td | 0.029 | 0.03 | | Damper circuit time constant in q-axis nonsaturated Tq | 0.028 | 0.03 | | Transient short-circuit time constant d-axis nonsaturated Td´ | 3.2 | 3.5 | | Subtransient short-circuit time constant q-axis nonsaturated Tq´´ | 0.028 | 0.029 |
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