A Method for Wind Farm Reactive Power Controlling using DIgSILENT and MATLAB

In order to regulate the voltages of Point of Common Coupling (PCC) and single wind turbine in a wind farm, it is necessary to control the output of reactive power of wind turbines, and in some case, it also need to control static var compensators (SVCs) or static var generators (SVGs) of the wind farm to satisfy the voltage set-point requirement. The accuracy of reactive power control system decides the control level of grid voltage. In order to improve the accuracy, this paper introduces modeling and simulation method of wind farm reactive power control system using DIgSILENT and MATLAB. At first, it introduces the modeling process and co-calling principle of the two kinds of software tools, and then emphasizes that it develops a kind of advanced wind farm reactive power control logic to realize control accuracy improvement in MATLAB, whereas the power quality and distribution logic of reactive power among wind turbines are simulated and assessed. In the end, taking an Inner Mongolia wind farm with 33 double-fed wind turbines as a test application, the wind farm reactive power control model is verified by comparing real wind farm operating data and simulation results, and the result shows that the accuracy of reactive power control system is higher than traditional method.