Abstract
This paper presented an accurate analysis of the instability in DFIG-based wind farms due to the use of series compensation and provided maximum power extraction from these farms using the high compensation without the unstable sub-synchronous oscillation occurrence. For this purpose, using modal analysis, it is first shown that the main cause of this instability is low wind speed in the high compensation. This issue causes the series compensated DFIG-based wind farms is unstable due to a sub-synchronous mode. In order to prevent the unstable sub-synchronous oscillation occurrence, a supplementary controller called SSRIPC and DFIG controllers are used. Also, for good dynamic response and proper use of the SSRIPC, an objective function considered based on three factors of minimum damping ratio, overshoot, and settling time of the oscillations. By accurate optimization of the proposed controller using root-locus and PSO algorithm, it is prevented the instability caused by sub-synchronous resonance and sub-synchronous control interaction that are classes of the sub-synchronous oscillations. IEEE SSR first benchmark model and MATLAB/Simulink software are used to validate the performance of the proposed method.
Highlights
Using capacitive series compensation of the line to increase the production power of the doubly-fed induction generator (DFIG) based wind farms, is more economical compared to other methods such as building the new transmission line, the network development and using the FACTS devices [1]
This paper proposed a method using a supplementary controller called the synchronous resonance (SSR) instability prevention controller (SSRIPC) to provide the high compensation level of the lines connected to the large DFIG-based wind farms at low wind speed without the unstable sub-synchronous oscillation occurrence
This paper studied and prevented the synchronous oscillation (SSO) phenomenon occurrence in the series compensated large DFIG-based wind farms using a supplementary controller called the SSR instability prevention controller (SSRIPC)
Summary
Using capacitive series compensation of the line to increase the production power of the doubly-fed induction generator (DFIG) based wind farms, is more economical compared to other methods such as building the new transmission line, the network development and using the FACTS devices [1]. The compensation level of the transmission lines connected to the DFIG-based wind farms is not high enough, because there is the probability of the sub-synchronous oscillation (SSO) phenomenon occurrence due to the high inductive properties of the DFIGs. The SSO is a phenomenon involving coincident oscillations between two or more power system elements, such as generator–turbine, series capacitor, power electronic controllers, and HVDC controllers. The SSR tends to involve interactions between a series compensated transmission systems and multi- mass turbine generators. It is a dynamic phenomenon with certain special characteristics and is of interest in power systems. There are two aspects of the SSR: self-excitation (SE) and torque amplification (TA)
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