Improved Control of DFIG Systems During Network Unbalance Using PI–R Current Regulators

By Jiabing Hu, Yikang He, Lie Xu, Barry W. Williams. IEEE transactions on industrial electronics (1982. Print), 2009

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Analysis and Design of Resonant Current Controllers for Voltage-Source Converters by Means of Nyquist Diagrams and Sensitivity Function (2011, methodology): “In PR controllers, one usual approach is to employ Bode diagrams and to study the stability through the phase margin at the crossover frequency fc defined by the proportional gain [3], [4], [7], [9], [12], [16], [17], [21], [22], [31], [32].”
Overview of control systems for the operation of DFIGs in wind energy applications (2013, background): “reactive power of (23) have three terms: the mean value, a term proportional to sin(2ωet), and a term proportional to cos(2ωet) [98], [101], [102], [110].”