ANCILLARY SERVICES IN RESTRUCTURED ENVIRONMENT OF POWER SYSTEM

In a restructured power market, apart from the firm transaction of the energy and power, independent system operator (ISO)  make arrangement for certain additional services to maintain the reliability and quality of power supply. Such additional services are required for maintaining active and reactive power balance, variation in frequency and voltage with in allowable limits in event of emergency handling of power system such as black start capability etc. In monopolistic market structure, these services have been integral part of the electricity company where as in restructured electricity markets a separate mechanism exists for such services named as ancillary services. The present paper has investigated into various ancillary services and their necessity to ensure safe and secure operation of power system.

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