Notes Topic 8

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Unformatted text preview: ................8 8.3 Grid connection of synchronous generators ...........................................................................................9 8.4 Power Conditioning and Power Quality...............................................................................................10 8.4.1 Voltage Fluctuations or Flicker .....................................................................................................10 8.4.2 Power Factor..................................................................................................................................10 8.4.3 Harmonics......................................................................................................................................10 8.4.4 Islanding ........................................................................................................................................11 8.5 Battery Charging Control Systems.......................................................................................................11 8.5.1 Series Regulation. ..........................................................................................................................11 8.5.2 Shunt Regulation. ..........................................................................................................................12 8.6 Wind and Diesel Hybrid Mini Grids ....................................................................................................13 GRID CONNECTION AND POWER CONDITIONING Grid connection refers to the electrical interface between the electric generator within the turbine and the utility grid. The design of the turbine and in particular the type of generator used, fundamentally determines the requirements of the grid connection. In all modern wind turbines the, microprocessor based, supervisory control system manages the interface with the grid. The simplest form of grid connection is direct grid connection, where the generated power is directly exported to the utility grid without the use of a power converter. Fixed speed turbines using asynchronous generators commonly use this type of grid connection. Variable speed turbines often use a power converter, installed between the generator and the utility grid. This power converter enables the generator to operate independently from the influence of the grid characteristics. This type of grid connection is termed indirect. Most electricity utilities have enforced regulations regarding power quality (frequency, voltage, harmonics etc) that electricity generators must abide when grid feeding. The power conditioning system is designed to ensure that the turbine’s exported power meets these requirements. Utility power quality requirements may preclude some designs of turbines in certain applications (such as on weak grids), hence it is the responsibility of the wind farm planner to recognise the inherent characteristics of the various types of grid connection and power converters that manufacturers use. 8....
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This note was uploaded on 06/09/2011 for the course PV 5053 taught by Professor Aasd during the Three '11 term at University of New South Wales.

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