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Power Quality Issues in Grid Connected Wind Farms. by A.D.Thirumoorthy Tamil Nadu Electricity Board India. Wind Energy. Large untapped potential in India ~ 65,000 – 100,000 MW
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Power Quality Issues in Grid Connected Wind Farms by A.D.Thirumoorthy Tamil Nadu Electricity Board India
Wind Energy • Large untapped potential in India ~ 65,000 – 100,000 MW • Technologies: Synchronous and Asynchronous Generators (with and without gears), New hybrid technologies are being introduced • Turbine unit sizes: 500 kW to 1.65 MW, may go up to 2.0 MW in near future • Leading States: Tamil Nadu – 4200 MW, Maharashtra – 1800 MW, Gujarat 1400 MW • Costs ~ Rs 6-6.5 Cr / MW subject to project size, location, technology
Voltage Vs Var • Leading reactive power raises local voltage • Lagging reactive power lowers local voltage Add capacitors to counteract low voltage conditions Add reactors to counteract high voltage conditions, Turn off capacitors
Case Study (Voltage Sag in Wind Mills) • This is a typical case of Wind Mills tripping due to Voltage Sag • Voltage Sag caused by tripping of another feeder in the same Sub Station due to earth fault • Rise in load current experienced • Suspect of induction Generator aiding the fault
Voltage Dip in WM Feeder -49.61%
Voltage Dip -51.4%
Tripping of WM Due to Sag Loss of WM Generation -42.5%
Case Study (Voltage Swell) • This a case study of Voltage Swell • Voltage swell caused in a Wind Mill connected feeder • Voltage Swell seen when Wind Mill connected feeder is isolated manually • Voltage swell due to discharge of Capacitors connected for PF correction
Voltage Rise in Wind Mill Feeder During Supply Failure +15.37%