February 2019
Intermediate
504 pages
18h 11m
English
Content preview from Dynamics and Control of Electric Transmission and Microgrids
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4Modeling and Simulation of Wind Power Generators
4.1 Introduction
Wind power is now a major source of energy in power grids and its share of overall energy production has grown rapidly in the past two decades. It is reported in [1] that the installed wind power generation world‐wide, which is currently more than 440 GW, is expected to exceed 760 GW by 2020. Large wind turbines with individual capacities of up to 6–8 MW are now available and large wind farms (onshore and offshore) having overall ratings of hundreds of megawatts are in operation. The availability of wind energy is variable, intermittent, and location dependent. This poses a challenge in grid operation if a large amount of wind generation is integrated into the grid. The injection of wind power into the grid has to be coordinated with the prevailing demand, available generation, storage, and transmission capacity so that the objectives of economy and reliability are met during power system operation.
While wind power is extracted using an electro‐mechanical system (a wind turbine coupled to a generator), the electrical configuration is different from conventional power plants, which use synchronous machines directly connected to the grid. The intermittent/varying nature of wind power availability and the operation at variable turbine speeds (to extract maximum power) favor the use of power‐electronic converters to interface generators to the electrical grid. Squirrel‐cage/wound‐rotor induction machines, wound‐rotor ...
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