Research in New Renewable Energy Wow and Renewable Energy ukiengineenng Dr Li Ran
Research in New & Renewable Energy Dr. Li Ran
Wind power
Wind Power
Recent studies in Wind Power Grid Doubly Fed Induction Generator Gearbox Filter Wind turbine 4Q Converter DFIG Grid Fault Ride Through
Recent Studies in Wind Power Gearbox Wind Turbine Doubly Fed Induction Generator 4Q Converter Filter Grid DFIG Grid Fault Ride Through
Renewable Energy Networks Grid code sets out requirements for grid interconnection Most current renewable generation systems are treated as negative load Future systems MUsT contribute to system frequency and voltage control Grid interconnection usually makes or breaks project Development of many (ALL?) renewable energy converter systems have concentrated on the device itself without detailed thought of how to convert the power for grid interconnection Future developments MUST consider the system
Renewable Energy Networks ▪ Grid code sets out requirements for grid interconnection. ▪ Most current renewable generation systems are treated as “negative” load. ▪ Future systems MUST contribute to system frequency and voltage control. ▪ Grid interconnection usually “makes or breaks” a project. ▪ Development of many (ALL?) renewable energy converter systems have concentrated on the device itself without detailed thought of how to convert the power for grid interconnection. ▪ Future developments MUST consider the system as a whole – REQUIRES INTEGRATED SYSTEM
Grid Code-Example o The value of grid-fault ride-through is increasingly appreciated. Grid code, e. g. Scottish Hydro-Electric Guidance Note A wind farm must remain connected under the following conditions depending on fault voltage reduction and registered capacity of wind farm wind farm registered capacity voltage during fault <30MW >=30MW 0% July 2005 January 2004 15% January 2004 before January 2004 The voltage refers to that on the transmission system(275 or 132 KM Transformer impedance and fault infeed from the wind farm are likely to result in a higher voltage at generator terminal Fault is cleared in 140 ms for 132 kV and 100 ms for 275 kV system Backup clearance time can extend to 300 ms
Grid Code - Example ● The value of grid-fault ride-through is increasingly appreciated. ● Grid code, e.g. Scottish Hydro-Electric Guidance Note A wind farm must remain connected under the following conditions depending on fault voltage reduction and registered capacity of wind farm. wind farm registered capacity voltage during fault <30 MW >=30 MW 0% July 2005 January 2004 15% January 2004 before January 2004 ● The voltage refers to that on the transmission system (275 or 132 kV). Transformer impedance and fault infeed from the wind farm are likely to result in a higher voltage at generator terminal. ● Fault is cleared in 140 ms for 132 kV and 100 ms for 275 kV system. Backup clearance time can extend to 300 ms