Utilização de um banco de baterias para regulação de frequência de uma microrrede aplicando técnica de controle LQR
Keywords: Frequency, Batteries, Linear Quadratic Regulator, Synthetic inertia
AbstractEven though Brazil is a reference in renewable energy participation on its electric matrix, there is still a motivation to diversify this matrix, for three reasons: water resource dependency; abundance of energy resources and maturity of technological development. With the reduction of generation and storage system costs, there is a trend to increase other renewable resources participation, beyond the hydraulic such as wind and solar energy. Nonetheless, related to their construction characteristics, wind and solar technologies are unable to naturally add inertia to the electric system. Thus, the large renewable energy insertion presents a challenge to electrical system operation. Therefore, it’s necessary to develop new alternatives to supply the disturbances caused, in particular, to the frequency range of the grid. In this context, this work proposes a LQR controller technic applied on a Battery Energy Storage System (BESS) for primary frequency regulation. Besides that, a dead band is used with the purpose that the system acts only on major disturbances. As a way of comparison, the Droop control is simulated for the same model. The simulations were performed using the Matlab Simulink® software.