Advanced load frequency control design approaches for a power system with penetration of renewable energy sources

Due to the boost of power systems interconnection as well as penetration of renewable energy (RE) power generation, the loads are varying dynamically. So there is a need of control of system frequency. The major objective of this thesis is aimed at advanced load frequency control (LFC) design approaches for a power system with penetration of RE power generation. First of all, the background and motivation of this topic are introduced, followed by the research status summary of three main components used in the proposed control scheme, namely, power system interconnection, LFC and battery energy storage system (BESS). After that, the concept of LFC in a interconnected power system with BESS is coined. Then, different types of battery models are introduced. And based on the I type Thevenin equivalent circuit, BESS model is set up. Subsequently, an adaptive variable droop control strategy is introduced to mitigate the defects of conventional control strategy. After that, every link in LFC including governor, turbine, GRC, generator and load are elaborated. On this basis, the single area LFC model is built. Afterwards, considering the power exchange in tie line, the single area LFC model is expanded to multi-area LFC model. Together with the proposed BESS, the model for LFC in a multi-area power system with BESS is established. Finally, the proposed models are tested based on Matlab/Simulink. The simulation findings show that the suggested control scheme is able to significantly improve the dynamic response of the power system to a sudden load change, and has certain practical engineering significance.Master of Science (Power Engineering