Estimation of hydrogenerator rotor dynamic thermal margine

Field winding temperature of the synchronous generator is one limiting factors shaping PQ capability curve. Therefore great operational importance to have information about this estimated with utmost accuracy. It can be measured directly using built-in sensors or determined indirectly. With increasing penetration renewable energy sources into high-voltage transmission system, fundamental changes happen in way conventional generating units work, including hydrogenerators. They are facing new operating modes characterized by rapid load and an increased number start-stop cycles. These operation lead additional thermal stress hydrogenerator parts, rotor. In order able respond demands that they faced with, it necessary estimate actual capacity rotor its influence on dynamic