Voltage dips due to direct connection of induction generators in low head hydro electric schemes

This paper analyses phenomena which affect voltage dip due to direct connection of induction generators running close to synchronous speed to electrical distribution systems in low head hydroelectric power schemes. The paper examines transient phenomena on connection of induction generators at close to synchronous speed in determining whether costly system reinforcement may be avoided thus making many uneconomic developments viable while satisfying constraints of permissible voltage dip if the transient phenomena is taken duly into account. More use of renewable energy in electricity supply thus reducing greenhouse gas emissions from fossil plant will therefore result. The analysis is based on a detailed induction generator model with single and double rotor bar simulation using Park´s equations with simulation of rotor dynamics on connection of the generator to the electrical supply