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.
Highlights
In the past few years, wind power penetration has significantly increased
This paper conducts a comparative analysis on the performance of doubly fed induction generator (DFIG) reactive power and voltage feedback control for inter-area oscillation damping control
The reactive power regulation and voltage regulation are all executed according to the control of DFIG output reactive power
Summary
In the past few years, wind power penetration has significantly increased. Among the various wind power generators, a doubly fed induction generator (DFIG) is the most widely used one in wind energy conversion systems [1]. The control capability of GSC and RSC gives DFIG additional advantages in flexible control over the conventional induction generators as concluded in [4]. Various interaction control, such as, power factor control and frequency control, may provide different damping contribution [5]. The output reactive power of DFIG is only related to the control reference value While both of the control schemes are feasible, their effectiveness varies and there has not been a systematic comparison between them. The main objective of this paper is to systematically and numerically investigate the differences between DFIG voltage and reactive feedback control schemes for inter-area oscillation damping. This paper is organized as follows: Section 1 gives the introduction; Section 2 describes the modeling of a test system including the control system of the rotor side converter; Section 3 shows the comparison results and gives the detailed discussion; and Section 4 provides the conclusions
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