Dynamic equivalent modeling of wind farm considering HVRT characteristic

Abstract

Power system with high integration of wind power appeals to be increasingly complicated in system simulation. It is meaningful to establish an accurate and convenient model considering dynamic characteristics of wind farm connected to power system. In this paper, an equivalent model is proposed focus on the high voltage ride through (HVRT) features of wind turbines. Firstly, the structure of wind power via high voltage direct current (HVDC) is investigated, and then the transient control strategy is designed in accordance with the grid code. Secondly, we select pre-fault voltage, active power, wind speed, post-fault voltage and action of chopper as input variable matrix according to mathematical model. On the basis of selected variables, the equivalent group number is obtained by using max-min distance clustering method. And then the multi-machine equivalent model of wind farm is built based on the clustering results. Finally, according to case verification of 15-turbine wind farm, the proposed equivalent model can reflect HVRT operating characteristics of wind farm more accurately.