Power system operation with wind energy integrations

Abstract

Wind energy with its low environmental impacts and sustainability has taken up a large share of the electricity generation market and it is expected to grow. The original power systems are primarily dominated by synchronous generators while wind generators utilize asynchronous induction machine to convert wind energy into electricity. Moreover, wind speed is not controllable. The integrations of wind energy into power systems have a great impact on power system operation. The influences brought by wind generators should be understood for maintaining secure and reliable operation of power systems. The inclusion of power electronic devices enables the variable speed operation of the wind generators. It largely facilitates the integrations of wind energy. This thesis considers doubly fed induction generators (DFIGs) type of wind generators. The appropriate modelling of wind generators for power system analysis is discussed. Three aspects of power system operations are considered in this thesis, which are steady state, small signal stability and transient stability analysis. The effects of wind energy integrations on these three aspects of power systems are investigated in detail. Different cases studies are provided throughout the thesis to illustrate effects brought by wind energy and arrive at the conclusions.