A Comparison between Voltage and Reactive Power Feedback Schemes of DFIGs for Inter-Area Oscillation Damping Control

Abstract

Reactive power modulation of wind power plants is an effective way to damp inter-area oscillation in wind power penetrated power systems. For doubly fed induction generator (DFIG) based wind farms, there are two different ways to achieve reactive power modulation: one is via reactive power feedback control, and the other method is via voltage feedback control. While both of the control schemes are feasible, their effectiveness may differ, and there has not been a systematic comparison between them. This paper investigates the differences between these two feedback schemes for inter-area oscillation damping control. The principles of utilizing DFIG for damping control is introduced at first. Then, analytical techniques including the frequency domain analysis, µ-analysis and time domain analysis are used to systematically study the performance of the two control schemes against inter-area oscillation. The robustness of the control schemes with respect to the variety of system operation points is also studied. The results from this paper can provide an insight into the understatement of DFIG reactive modulation against oscillation and guidance for controller design.

Influence of Crowbar and Chopper Protection on DFIG during Low Voltage Ride Through

“…DFIG are electric generators where the field magnet windings and armature windings are separate. The stator of the DFIG is connected directly to the grid, while the rotor is connected through two back-to-back Voltage Source Converters (VSC) [9,10]. By feeding adjustable frequency, AC power to the field windings, the magnetic field can be made to rotate, allowing variation in motor or generator speed.…”

Eigen-Analysis Considering Time-Delay and Data-Loss of WAMS and ITS Application to WADC Design Based on Damping Torque Analysis

“…Otherwise, the data of the previous moment was adopted. As for the mathematical model, the input of WADC was directly calculated according to (6). A three-phase, short-circuit fault occurred at B8 and was cleared 0.01 s later.…”

“…With local signals and measurements, the conventional controller has limited ability to damp oscillations between areas [4]. Applications of the phasor measurement unit (PMU) and power system stabilizer (PSS) adopting remote signals make it possible and practicable to inhibit inter-area oscillations [5][6][7]. A salient characteristic of wide-area measurement systems (WAMS) is data corruption, including time-delay, data-loss, and disordering, which can prominently jeopardize a system's dynamic stability [8][9][10].…”