Frequency Regulation Improvement in Power Systems using an Output-Feedback Approach

Fossil fuels are widely used for power generation, but they are increasingly scarce, polluting, and expensive. For this reason, the incorporation of energy generation from renewable sources is increasing at an accelerated rate in recent years in the electricity sector. The injection of large amounts of wind and photovoltaic energy into the electrical system must consider the changes that the stability of the system may undergo, being the frequency stability directly affected by the renewable and variable generation, and therefore, strategies must be implemented to guarantee the safety and reliability in the operation of the electrical system. The main contributions of this paper are: 1) the implementation of an observer-based state feedback control for case studies of typical generation power systems, to improve the frequency behavior of the system, so that it maintains correctly regulated and reaches the steady state without the presence of oscillations and in a shorter period of time; 2) the implementation of the super twisting controller to compensate for the intermittency of renewable generation in a power system, and whose action contributes significantly to the system frequency stability, achieving rapid convergence in finite time and without steady state error. For the case studies, the results were satisfactory, demonstrating that both control techniques are highly efficient.