Effects of load capacity and ECS timing constant parameter on the dynamic behavior of grid connected wind farms

Abstract

The control of grid frequency in a power system is vital in order to maintain the frequency of the system within its nominal value. In this chapter, the dynamic behavior of a grid connected wind farm composed of a squirrel cage induction generator is presented. The considered grid is composed of steam turbines connected to the wind farm. An energy capacitor system is used to stabilize the wind farm during periods of wind speed change. Loads of various capacities are connected to the grid in order to test the robustness of the controllers of the energy capacitor system. Furthermore, the timing constant of the inbuilt DC–DC chopper of the energy capacitor system was varied considering the network having various load capacities. The system performance was evaluated using Power System Computer Design and Electromagnetic Transient Including DC (PSCAD/EMTDC). The same conditions of operation were used in investigating the various scenarios for effective comparison. The natural wind speed employed was the same for all the scenarios. The presented results show that small load capacity with high value of low pass filter time constant gave better responses of the grid frequency and the entire variables of the power network.