Rotor Angle Stability with Voltage Stability:–
- Rotor Angle Stability refers to the ability of the synchronous machine of an interconnected power system to remove in synchronism after being subjected to a disturbances. Voltage stability refers to the ability of the power system to maintain steady acceptable voltages at all the buses in the system after being subjected to a disturbances.
- Rotor angle stability is normally concerned with integrating remote power plant to a large system over long transmission line whereas voltage stability is concerned with load area and load characteristics.
- Rotor angle stability is basically generator stability. Voltage stability is basically load stability.
- Rotor angle stability depends on the ability of each synchronous machine to maintain equilibrium between electromagnetic torque and mechanical torque. Voltage stability depends on the system to maintain equilibrium between load demand and load supply.
- If voltage collapse at a point in a transmission system it is an angle instability situation however if voltage collapse in a load area is a voltage instability.