**2. Grid connected operation of SCIG**

The SCIG has the following main parts: (1) Gear Box, (2) cage induction generator, (3) soft starter, and (4) Capacitor for power factor compensation.

*An Algorithm for Default Detection of Wind Turbine Generators DOI: http://dx.doi.org/10.5772/intechopen.104793*

**Figure 2.** *Classification of wind turbine generator.*

#### **Figure 3.**

```
Fixed speed SCIG wind turbines from [4].
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The SCIG is a very simple structure of WTG used in the system. SCIG is directly connected to the grid using a starter and transformer. A soft starter is available in starting only to limit high inrush current. This is the most widely used structure worldwide due to less maintenance and simple design. The main disadvantage is that full power cannot be extracted from the grid. The SCIG needs high reactive power, which the capacitor bank locally supplies, as shown in **Figure 3**. The machine is run above synchronous speed using pitch control.
