The dynamic behaviour of the frequency in Electrical Power Systems (EPSs) s directly related to the balance between the mechanical power and the electrical power of each generator system. In the operation of EPSs, a nominal value is established as a reference for the balance of powers, the load changes (electrical power) are reflected in the level of the frequency, which makes it necessary to modify the mechanical power to restore the equilibrium. When faced with small changes in load, it is generally possible to modify the mechanical power without having appreciable deviations from the frequency; this is not possible in the case of significant generation losses, so frequency control is carried out through changes in electric power. This paper presents an approach of load frequency control of distributed generation system using a proportionalintegral-derivative (PID) controller optimized by a stochastic optimization method known as Genetic Algorithm.

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