A review on oscillations in Wind Park due to ferroresonance and subsynchronous resonance

Abstract

High penetration of renewable rotary generations like wind turbine to utility system causes contribution in power oscillations due to occurrence of different phenomena. Ferroresonance and subsynchronous resonance (SSR) in utility system are able to lead in power oscillation, instability of the system and devastating impact on rotary generators. Hence, investigation on impact of such oscillations on operation of nearby renewable rotary generations, like DFIG (doubly fed induction generator) in Wind Park seems to be beneficial to attain insightful guidelines for future of research in this field. SSR causes increasing the voltage, thus, it brings about saturation of transformer core and results in occurrence of ferroresonance. Ferroresonance causes frequency difference between two points in the network and consequently power oscillation, which is superimposed on torsional oscillation in SSR. Therefore, as SSR and ferroresonance encounter each other, they are investigated under one work to scrutinize impact of such phenomena on behaviour of DFIG. The results show deviation of electrical waveforms and devastating stress on mechanical parts of DFIG rotary components due to huge magnitude of electrical and mechanical quantities in effect of SSR and ferroresonance.

Dynamic Analysis and Suppression Strategy Research on a Novel Fractional-Order Ferroresonance System

“…Unlike resonance, ferroresonant oscillations are related not only to the system frequency, but also to other parameters like the magnetic flux of the transformer, damping resistors, and reactors; the system voltage magnitude; and the switching transient and steady state. Several studies with respect to the ferroresonant oscillation phenomenon, which is caused by nonlinear characteristics of the circuit in power transformers, have been widely reported in the literature [6][7][8]. Djebli et al [9] established an accurate dynamic model of a transformer considering the dependence of frequency and peak induction, and the impact of switching time and the eddy current in the core lamination on ferroresonant oscillations was studied.…”

Study on Hopf bifurcation types and dominant parameters of grid‐connected voltage source converter considering non‐linear saturation elements

“…Grid-connected voltage source converter (VSC)-dominated power systems are quickly becoming a common type of power system due to the rapid development of new energy sources like wind power, photovoltaic, and flexible high-voltage direct current (HVDC). However, grid-connected VSC-related subsynchronous oscillations have been reported globally [1][2][3][4].…”

“…Grid‐connected voltage source converter (VSC)‐dominated power systems are quickly becoming a common type of power system due to the rapid development of new energy sources like wind power, photovoltaic, and flexible high‐voltage direct current (HVDC). However, grid‐connected VSC‐related subsynchronous oscillations have been reported globally [1–4]. Most recent studies on oscillation mechanisms contend that dispersive oscillations in the system are usually caused by power sources, such as wind farms with negative equivalent resistances at subsynchronous frequencies [5–7].…”

Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers

“…The effects of ferroresonances on inductive voltage transformers (IVTs) are well-known and include core saturation, current and voltage distortion [ 4 ], overcurrents and overvoltages [ 5 ], temperature raises, vibration, noise, damages in the primary winding [ 6 ], and the displacement of the neutral potential of the transformers outside the normal voltage triangle [ 7 ]. Recent studies also establish severe effects on wind turbines with doubly fed induction generators (DFIG) [ 8 , 9 ], which become catastrophic if superimposed on subsynchronous resonances (SSR) [ 10 ].…”