Abstract

This paper describes a permissive load frequency control (LFC) real life model for long-term time domain simulations. The model represents a supplementary control system to governor control systems based on area control error (ACE) calculation. Each forth second, ACE will be checked. If ACE is outside of its dead-band, one signal will be generated and broadcasted to all power plants involved in secondary control. Considering the received signal (positive or negative) and power plant participation factors, each power plant will react in order to reduce ACE. This LFC type is around 20 years in service in the Serbian power system with minimum maintenance. The advantage of this LFC is that it is simple, reliable, it can follow strict ENTSO- E rules, and it could be implemented to all generation types including renewable sources. The paper does not bring a new LFC methodology. However, it provides a contribution to modelling existing LFCs.

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