**9. References**


<sup>\*</sup> Corresponding Author

[9] E.F. Fuchs and M.A.S. Masoum. "Power quality in power systems and electrical machines" .Academic Press, 2008.

18 An Update on Power Quality

solution of research work related to harmonics.

 and Khaled E Addoweesh *Department of Electrical Engineering, King Saud University, Riyadh, Saudi Arabia* 

Electric Power Systems Research, 79(1):80–88, 2009.

*Department of Electrical Engineering, King Saud University, Riyadh, Saudi Arabia Saudi Aramco Chair in Electrical Power, Department of Electrical Engineering, King Saud* 

[1] A.M. Al-Zamil and D.A. Torrey. "A passive series, active shunt filters for high power

[2] S.J.Chapman. "Electric machinery fundamentals". McGraw-Hill Science/

[3] C.J. Chou, C.W. Liu, J.Y. Lee, and K.D. Lee. "Optimal planning of large passiveharmonic filters set at high voltage level". Power System IEEE Transactions on,

[4] JC Das. "Passive filters-potentialities and limitations". In Pulp and Paper Industry Technical Conference, 2003. Conference Record of the 2003 Annual, pages 187–197. IEEE, 2003. [5] F. De la Rosa and Engnetbase. "Harmonics and power systems". Taylor&Francis, 2006. [6] A. Eid, M. Abdel-Salam, H. El-Kishky, and T. El-Mohandes. "Active power filters for harmonic cancellation in conventional and advanced aircraft electric power systems."

[7] I. F II. "IEEE recommended practices and requirements for harmonic control in

[8] L.G. Franquelo, J. Napoles, R.C.P. Guisado, J.I. Leon, and M.A. Aguirre. "A flexible selective harmonic mitigation technique to meet grid codes in three-level PWM

converters". Industrial Electronics, IEEE Transactions on, 54(6):3022–3029, 2007.

applications". Power Electronics, IEEE Transactions on, 16(1):101–109, 2001.

This chapter summarizes one of the major power quality problems that is the reason of many power system disturbances in an electrical network. The possible sources of harmonics are discussed along with their effects on distribution system components including the transformers, switch gears and the protection system. The regulatory standards for the limitation of harmonics and their measurement techniques are also presented here. The purging techniques of harmonics are also presented and various kind of harmonic filters are briefly presented. To strengthen the knowledge base, this chapter has also discussed the control of harmonics using PWM techniques. By this chapter we have attempted to gather the technical information in this field. A thorough understanding of harmonics will provide the utility engineers a framework that is often required in the

**8. Conclusion** 

**Author details** 

*University, Riyadh* 

**9. References** 

 \*

Corresponding Author

Engineering/Math, 2005.

electrical power systems". 1993.

15(1):433–441, 2000.

Yasin Khan

Hadeed Ahmed Sher\*


[27] N. Pecharanin, M. Sone, and H. Mitsui. "An application of neural network for harmonic detection in active filter". In Neural Networks, 1994. IEEE World Congress on Computational Intelligence., 1994 IEEE International Conference on, volume 6, pages 3756–3760. IEEE, 1994.

**Chapter 2** 

© 2013 Mohod and Aware, licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

© 2013 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution,

**Power Quality and Grid Code Issues in Wind** 

The aim of the electric power system is to produce and deliver to the consumer's electric energy of defined parameters, where the main quantities describing the electric energy are the voltage and frequency. During normal operation of system the frequency varies as a result of the variation of the real power generated and consumed. At the same time, because of voltage drops in the transmission lines and transformers it is impossible to keep the voltage at the nominal level in all the nodes of the power system. It is also impossible to keep an ideal sinusoidal shape of the voltage or current waveform due to the nonlinearities in many devices use for electric energy generation, transmission and at end users. That is why the electric power system require to keep the quantities near the nominal value[1]-[5].

Recently, the deregulated electricity market has also opened the door for customers own distributed generation due to economical and technical benefit. The liberalization of the grid leads to new management structures, in which the trading of energy is important. The need to integrate the renewable energy like wind energy into power system is to minimize the environmental impact on conventional plant of generation. The conventional plant uses fossil fuels such as coal & petroleum products to run the steam turbines and generate the thermal power. The fossil fuel consumption has an adverse effect on the environment and it is necessary to minimize the polluting and exhausting fuel. The penetration of renewable energy especially wind has been increasing fast during the past few years and it is expected to rise more in near future. Many countries around the world are likely to experience similar penetration level. During the last decade of the twentieth century, worldwide wind energy

Today's trends are to connect all size of generating units like wind farm,solar farm,biogas generation and conventional source like coal,hydro,nuclear power plant in to the grid

and reproduction in any medium, provided the original work is properly cited.

**Energy Conversion System** 

Sharad W. Mohod and Mohan V. Aware

http://dx.doi.org/10.5772/54704

**1. Introduction** 

Additional information is available at the end of the chapter

capacity is doubled approximately every three years.

system shown in Fig.1.0

