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The simulation study of active GUPFC system is carried out using MATLAB Simulink platform. MATLAB (matrix laboratory) is a multioptional numerical computing environment and programming language. It is developed by MathWorks Inc. MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces and interfacing with programs written in other languages, including C, C++, Java, Fortran and Python. An additional package, Simulink, adds graphical multi-domain simulation and Model-Based Design for dynamic and embedded systems. The simulations carried out with the following conditions and assumptions:

1 Hardware: Intel Core i5 2,450 M CPU, 2.5 GHz, 4 GB RAM with Win 7, 64 bit OS.

2 Software: MATLAB Simulink (7.10.0.499) 2010a release

3 Simulation time: 3.00 s

4 Simulation solver: ode23tb (stiff/TR-BDF2)

5 Simulation type: Variable step

6 Simulation relative tolerance: 1e−3: 0.001

The active GUPFC is simulated for the simplified general test system as shown in Figure 2.14. The test system parameters presented in the Appendix. With a grid connection, the system uses power for load feeders, whereas the system without grid connection continues to supply power to TPS auxiliaries using active GUPFC. Hence a load of TPS auxiliaries is always taken care of by active GUPFC.

The system illustrated above is simulated for two phases to a ground fault with phases A and B (R and Y) and phases B and C (Y and B) using MATLAB Simulink. The simulation conducted without GUPFC, with GUPFC and with active GUPFC for common test conditions. The combined result is plotted with load voltage against time and illustrated in Figure 2.15. The sequence of events is as shown in Table 2.2.