Abstract:
Short-term voltage instability/fast voltage collapse or unacceptably slow voltage recovery is a growing industry problem. We have described the problem, the mechanism of voltage collapse, and its consequences. As we have taken low inertia induction motors that are mainly used in air-conditioners as the preluding factor when accidental multi-phase short circuit taken place in parallel feeder. So the detailed performance characteristics of induction motor, which impede the voltage recovery and rapid decline of system voltage, are described. Even though the tripping by primary relay system partially recovers the voltage, inadequate reactive power support aggravate the voltage profile, and entire system is completely shut down and system has to be restarted. To avoid the massive power loss the dynamic reactive power is injected by innovative super conductorised rotor laid synchronous motor, which is discussed in detailed as a solution.
Synchronous condensers are an attractive source of dynamic VARs (both inductive and capacitive) to improve system stability and maintain voltages under varying load conditions and contingencies. A synchronous condenser is a rotating machine that runs synchronized with the grid. Its field is controlled with a voltage regulator to either generate or absorb reactive power as needed by the power system. Dynamic Superconducting Condenser (DSC) machines upgrade existing technology by using a conventional armature mated with a field winding made from High Temperature Superconducting (HTS) wires. The result is a DSC that is both more efficient and has lower maintenance than conventional machines. It can provide up to 8 pu current for short periods to support transient VAR requirements. It supports the grid as infinite reactive power source for a short time to prevent voltage collapse.
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