An Accurate Forced Oscillation Location and Participation Assessment Method for DFIG Wind Turbine

Abstract

With the integration of wind energy, the widely used doubly fed induction generator wind turbines (DFIG-WT) could induce Power System forced oscillations (FOs), which threaten the safety of power grid. In this paper, an accurate FOs location method is proposed to pinpoint sources of FOs to the specific components inside a DFIG-WT and a participation assessment method is proposed to evaluate the role of DFIG-WTs in the FOs event. Firstly, the energy structure of the DFIG-WT is constructed and the correspondence between the physical components and energy structure of the DFIG-WT is established. Thus, the sources of FOs can be located by the energy flow among the converter, wind turbine and induction generator. Furthermore, the port-controlled Hamiltonian (PCH) method is used to analyze the influence of external disturbances to the potential energy of DFIG-WT, based on which the participation factor of the DFIG-WT in FOs event can be defined. The simulation results demonstrate that the proposed method is able to locate the oscillation sources accurately and reveal the participation of the DFIG-WT in FOs events effectively.

The observability and controllability metrics of power system oscillations and the applications

“…The method of participation factor in the power system can also reflect part of system observability and controllability degree (He et al, 2019;Huang et al, 2019;Lei et al, 2019;Zhou et al, 2019). To monitor oscillation, Lei et al (2019) and Huang et al (2019) respectively determined the type and locations of components causing oscillation by calculating the participation factor. To suppress oscillations, strong correlation variables were determined by the participation factor method, and then, a damping controller was designed (Zhou et al, 2019).…”

Construction of detailed energy function of double‐fed induction generator for small signal stability analysis of power systems with a high penetration of double‐fed induction generator

“…At present, some scholars in the industry have applied the energy analysis method to LFO and made great progress [11][12][13][14][15][16]. Literature [11][12][13] used the energy method to reveal the essence of LFO from a different perspective.…”

“…Therefore, research on the DFIG energy function is also emerging. Literature [16] constructed a brief energy structure of DFIG and established the corresponding relationship between the internal physical components of DFIG and the parts of the energy function. Then the established energy structure is applied to the location of the forced oscillation source.…”

Very Low-Frequency Oscillation Source Localization on Ireland's Power System

“…In the literature, numerous theoretical analyses for VLFO source identification are available [8][9][10][11][12][13][14][15], a detailed review can be found in [16]. However, it is well recognised that Dissipation Energy Flow (DEF) [17] [18] is considered one of the most promising and already has some practical success in real-world applications.…”