Wind energy is one of the most available and exploitable forms of renewable energy. Before the invention of steam engine, wind power had been used for centuries in sailing ships and then for pumping water and grinding grain. In the late 19th century, as electricity was generated using popular sources such as thermal and hydel power, wind energy fell into disfavor. However some countries did not have adequate fuel and water power resources, which led them to look for alternative ways of generating electricity. Denmark was one such country which pioneered the development of wind mills for generation of electricity in 1890s. As the installed capacity of wind power is significant and always increasing, the grid code focuses on the fault ride through capability of wind turbines which means that subsequential disconnection of wind turbine during grid faults is not accepted. In most of the countries, it is required that the Wind Electric Generator(WEG) should not trip for 625ms fault duration.When the speed of Squirrel Cage Induction Generator (SCIG) coupled to wind turbine exceeds the permissible upper limit , the protective devices will act in such a way that it trips.With regard to maintaining the short term voltage stability, all grid codes require that the voltage in the transmission power grid is re-established without subsequent disconnection of large wind farms. This chapter analyzes the impact of penetration level and load demand on the transient stability margin of squirrel cage induction generator(SCIG) coupled to wind turbine in the event of any unbalanced or balanced fault in the grid. Simulation is done in MATLAB Simulink and results are presented.
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Va Vanitha and Devarajan, Nb, “Analysis of transient stability margin of a wind farm using squirrel cage induction generator with fixed capacitance compensation”, European Journal of Scientific Research, vol. 59, pp. 370-382, 2011.