**5.1 Demostration example using SVC controller**

The two SVC models based susceptance values and firing angle are included in the FACTS Simulator; the two models can be applied to a different practical power systems (smal, medium and large test systems). To understand the real contribution of the shunt FACTS controller (SVC) to enhance the power quality, the shunt controller integrated in a practical modified electrical network, IEEE 30-Bus. Voltage deviation ( Δ*V* ) power loss ( *Ploss* ), active power branch flow ( *Pij* ), and system loadability ( λ ), are the indices of power quality considred to demonstrate the improvement of power quality, to validate the flexibilite, and the simplicity of the proposed educational SimFACTS package based Matlab.

Fig. 25 shows the improvement of voltages profiles using multi SVC controllers installed at 8 buses. Fig. 26 shows the evolution of voltage profiles at all buses based continuation power flow without SVC integration, the loading factor is 2.9449 p.u. By integration SVC Controllers at 8 critical buses, the loading factor improved to 3.1418 p.u. Fig. 27 shows clearly the contribution of shunt FACTS controllers to improve the power system loadability. Details results related to the integration of series controllers (TCSC, SSSC) and hybrid controllers (UPFC) will be given in the next contribution.

The FACTS models integrated in the proposed educational power system control are those proposed by (Achat et al., 2004), and by Canizares (Canizares, C. A, at al., ). The Newton-Raphson algorithm is used to calculate all the electrical values involved in power system.. The FACTS simulation package is capable of doing interactive simulations for several types

Using this simplified and interactive program, user can easely understand the basic concept of this new technolgy based FACTS devices introduced to power system operation and control. During simulation user can access directly to the code source program of any desired function (Ybus, Newton-Raphson, SVC Model, STATCOM model, TCSC Model, UPFC Model, Graphic functions,) , user also can modify the content of existant models, and

*SVC with Variable Susceptance Model* 

*TCSC with Variable Reactance Model* 

Table. 1. List of FACTS models used in the first version (V1.0) of the SimFACTS package

The two SVC models based susceptance values and firing angle are included in the FACTS Simulator; the two models can be applied to a different practical power systems (smal, medium and large test systems). To understand the real contribution of the shunt FACTS controller (SVC) to enhance the power quality, the shunt controller integrated in a practical modified electrical network, IEEE 30-Bus. Voltage deviation ( Δ*V* ) power loss ( *Ploss* ), active

considred to demonstrate the improvement of power quality, to validate the flexibilite, and

Fig. 25 shows the improvement of voltages profiles using multi SVC controllers installed at 8 buses. Fig. 26 shows the evolution of voltage profiles at all buses based continuation power flow without SVC integration, the loading factor is 2.9449 p.u. By integration SVC Controllers at 8 critical buses, the loading factor improved to 3.1418 p.u. Fig. 27 shows clearly the contribution of shunt FACTS controllers to improve the power system loadability. Details results related to the integration of series controllers (TCSC, SSSC) and

the simplicity of the proposed educational SimFACTS package based Matlab.

hybrid controllers (UPFC) will be given in the next contribution.

λ

), are the indices of power quality

*TCSC with Variable Firing Angle Model* 

*SVC with Firing Angle Model* 

**5. Simulation test and results using SimFACTS** 

of controllers as shown in Table 1.

Shunt

Series

test the efficiency of the modiefd models.

Combined (Hybrid) *UPFC Model* 

**5.1 Demostration example using SVC controller** 

power branch flow ( *Pij* ), and system loadability (

Topology Model Identification

*STATCOM Model* 

*SSSC Model* 

Fig. 25. Voltage profiles normal condition: case: with and without SVC installation. *NSVC*=8: (10-17-19-21-22-24-27-29)

Fig. 26. Voltage profiles with continuation power flow: case: Without SVC

Understanding Power Quality Based FACTS

**29** 

**1** 

**2** 

**6. Results discussions** 

margin.

normal condition and at critical situations.

**13** 

**14** 

**3 4** 

**1**

**12** 

**16** 

**15** 

**27** 

**5** 

Fig. 29. Single line diagram for the modified IEEE 30-Bus test system (with FACTS devices)

The effeciency of the integrated of multi SVC controllers at different location is tested at

1. Voltage magnitude is one of the important indices of power quality. For a secure operation of the power system, it is important to maintain required level of security

**9** 

**17** 

**10** 

**18 1**

**23 24** 

**2**

**21** 

**6** 

**22** 

**8** 

**7**

Using Interactive Educational GUI Matlab Package 227

**26 25** 

Fig. 27. Voltage profiles with continuation power flow: case: With SVC installation: NSVC=8: (10-17-19-21-22-24-27-29)

Fig. 28. Voltage profiles improvement at critical bus (bus 30) with continuation power flow: case: With and without SVC installation: NSVC=8: (10-17-19-21-22-24-27-29)

**With Compensation (SVC)**

**Bus1 Bus2 Bus3 Bus4 Bus5 Bus6 Bus7 Bus8 Bus9 Bus10 Bus11 Bus12 Bus13 Bus14 Bus15 Bus16 Bus17 Bus18 Bus19 Bus20 Bus21 Bus22 Bus23 Bus24 Bus25 Bus26 Bus27 Bus28 Bus29 Bus30**

**0.5 1 1.5 2 2.5 3**

**Without SVC With SVC**

**Loading Parameter** λ **(p.u.)**

**0 0.5 1 1.5 2 2.5 3 3.5**

**Loading Parameter** λ **(p.u.)**

Fig. 28. Voltage profiles improvement at critical bus (bus 30) with continuation power flow:

case: With and without SVC installation: NSVC=8: (10-17-19-21-22-24-27-29)

Fig. 27. Voltage profiles with continuation power flow: case: With SVC installation:

λ**=3.1418 p.u**

**0.5**

NSVC=8: (10-17-19-21-22-24-27-29)

**0.5**

**0.6**

**0.7**

**0.8**

**0.9**

**Voltage (p.u)**

**1**

**1.1**

**1.2**

**1.3**

**0.6**

**0.7**

**0.8**

**0.9**

**Voltage (p.u)**

**1**

**1.1**

**1.2**

**1.3**

Fig. 29. Single line diagram for the modified IEEE 30-Bus test system (with FACTS devices)
