**8. References**


2. One might think that the larger number of FACTS devices integrated in a practical power systems, the greater increase in the system loadability, based in experience, this supposition is not always true, there is a maximum increase on load margin with

3. System loadability analysis: To guide the decision making of the expert engineers, the power flow solution with consideration of FACTS devices should take in consideration the critical situation due to severe loading conditions and fault in power system, so it is important to maintain the voltage magnitudes within admissible values at consumer

4. Power loss analysis: Power loss is also an important indice used by expert engineers in power system operation and planning. Based on experience and simulation results, it is not always true that the larger number of FACTS devices integrated in a practical power systems, the greater decrease in power loss. Optimal location and coordination

5. Optimal location of FACTS devices is not introduced in this first version of SimFACTS, user can choose, number and location of FACTS devices based on his personal experience, for example in this case study we can get the same power quality indices (power loss, voltage deviation, and system loadability) using only three SVC Conrollers

This chapter discusses the development of an educational simulator for the FACTS devices. The motivation of this first version of simulator is to provide the undergraduate engineers students with a simple and flexible tool about the principle of FACTS modelling and the contribution of FACTS devices to enhance power quality. The simulator has been developed under the simple graphic user interface (GUI) from MATLAB program. In this first version the user can edit, modify and save the FACTS parameters proposed for each type of Controllers in a specified file (Data) and choose location of different FACTS based on the

Power quality analysis based series FACTS devices (TCSC Model), and Hybrid devices (UPFC Model) can be demostrated using the same strategy, due to the limited chapter length, new results related to these devices will be given in details with the next new

Abur, A., F. H. Magnago and Y. Lu, Educational toolbox for power system analysis, *IEEE* 

Acha, E., Fuerte-Esquivel C, Ambiz-Perez (2004), FACTS Modelling and Simulation in

Canizares, C. A., Power flow and transient stability models of FACTS controllers for voltage

Coelho, L. S., R. C. Thom Souza, and V. Cocco mariani, (2009) Improved differential

evoluation approach based on clutural algorithm and diversity measure applied to

*Computer Application in Power*, vol. 13, no. 4, Oct. 2000, pp. 31-35.

respect to the compensation level (number and size of FACTS devices).

bus under abnormal situation (load increase and contingency).

results given by power flow and his personnel practical experience.

and angle stability studies, *IEEE Proceeding* , 2000

Power Networks*.* John Wiley & Sons.

installed at critical buses.

**7. Conclusion** 

chapter.

**8. References** 

between multi types of FACTS devices is an important research axes.

solve economic load dispatch problems, *Journal of Mathemtics and Computers in Simulation*.


**10** 

**A Power Quality Monitoring System**

Krisda Yingkayun1 and Suttichai Premrudeepreechacharn2

The problems about power quality have increasingly caused a failure or a malfunction of the end user equipment for the past few years up to now. The problems have concerned with either voltage or current frequency deviation. To have the power quality monitoring done flowingly and completely, the measurement takes an important role on voltage, current, frequency, harmonic distortion and waveforms. Many researchers have used methods of power quality measurement (Dugan et al., 2002; Baggini, 2008) while other researchers have used various protocols to control the system (Auler & d'Amore, 2002). Others have presented the data acquisition based on PC (Batista et al., 2003) or Power Line Communication (Hong et al., 2005) or TMS320CV5416 DSP Processor (Rahim bin Abdullah & Zuri bin Sha'ameri, 2005). Another researcher has applied ARM and DSP processor (Yang & Wen, 2006) or has only applied DSP processor (Salem et al., 2006) to monitoring power quality in real time. In the meantime, the detecting fault signals of power fluctuation in real time and a power quality monitoring for real-time fault detection using real-time operating system (RTOS) are proposed (Yingkayun & Premrudeepreechacharn, 2008,2009) and the low cost power quality monitoring system is suggested (So et al., 2000; Auler & d'Amore,

This chapter has developed the idea of power quality monitoring system via the Ethernet network based on the embedded system with the two selected ARM7 microcontrollers: ADUC7024 and LPC2368. On account of ADUC7024, it has a function of sampling waveforms and of writing the sampling signals to the external memory. Meanwhile, LPC2368 can execute the main tasks: detecting the fault signals; storing fault data in SD-CARD up to 2 GB; and communicating with PC or laptop via the Ethernet network. The power quality monitoring on the embedded system suggested can acquire the voltage, the status and the frequency. It can send them via network at real time, can operate as stand alone equipment and can display the fault signals in real time of power fluctuation. But anyhow, when being absent, we can download the fault data from the site place, depending on the program configuration. In this case the fault signals can be displayed on the screen of the PC or laptop at real time or can be done after as desired. Moreover, there can be a single

**1. Introduction** 

2009), for example.

**Based on the Embedded System** 

**Via the Ethernet Network** 

*1Rajamangala University of Technology Lanna,* 

*2Chiang Mai University* 

*Thailand* 

