DefinePK

Abstract

Power Capacitors plays a vital role in reactive power compensation. When the capacitors are connected to the transmission line, it improves the reactive power. Although the reactive power is improved, there is a possibility for sub synchronous resonance created by this capacitors in the transmission line can travel to the generator side. The sub synchronous resonance causes electro-mechanical stress in the generator shaft which ultimately leads to malfunction of the entire system. It is necessary to find out operating modes of the generator and turbine when the line is compensated with capacitors. Once the operating modes are clear, torsion analysis will give the weak points in the turbine generator shaft which is encountered immediately when sub synchronous resonance arises. It is possible to damp the sub synchronous resonance when the weak points are monitored continuously, in this paper, three phase generator is coupled with a prime mover and the line is compensated with the series capacitors. The stress on the turbine is analyzed based on the torque of two rotating machines. Finite element method gives the weak points in the turbine generator shaft system.