Page 210 - Hybrid-Renewable Energy Systems in Microgrids

190 Hybrid-Renewable Energy Systems in Microgrids

Figure 9.34 Turbine speed response.

3 Conclusion

In this chapter small signal analysis and stability enhancement of FSWT genera-
tor system using SDBR has been reported. A detailed small signal stability analy-
sis model has been developed for the grid connected fixed speed WTGS including
SDBR, which includes two-mass drive train, IG, capacitor bank, transmission line,
and SDBR. Based on the analytical and time domain analyses the following conclu-
sions have been drawn.
1. The eigenvalue analysis of WTGS including SDBR is performed by both analytical and time
domain linMOD approaches for the sake of preciseness. Participation factor analysis reveals
the origin of the different modes, whereas sensitivity analysis shows variation of eigenvalue
with respect to the change of any system parameters with and without SDBR.
2. It is found that SDBR improves the dynamic performance of the system during small distur-
bances such as voltage dip condition, loss of load, and so on.
3. It is also found that incorporation of a small SDBR dynamically during network disturbance
such as a grid fault condition has been found an effective means to enhance the stability of a
grid-connected fixed speed WTGS. Using the developed model, it is also possible to find the
effects of different system parameters on transient stability of the grid-connected WTGS.
The results presented in this study helps to investigate the effects of system param-
eters on different modes, determination of the critical parameter sets, value of SDBR
which is sufficient to damp out the oscillations. Finally, it can be concluded that,
SDBR can be a useful means to augment the stability of FSWT generator system
without the installation of any expensive FACT device.