Overview of Sub-synchronous Oscillation in Wind Power System

Abstract

Nowadays with the improvement in the degree of emphasis on new energy, the wind power system has developed more and more rapidly over the world. Usually the wind plants are located in the remote areas which are far from the load centers. Generally series compensated AC transmission and high voltage DC transmission are made use of to improve the transmission capacity as two main effective ways which can solve the problem of large scale wind power transmission. The paper describes the three kinds of impact varieties and impact mechanisms in the sub-synchronous oscillation phenomena of wind power system based on doubly fed induction generator (DFIG) wind generators. At last, we point out the important problem that should be stressed in the wind power system.

Recent development and future trends of resonance in doubly fed induction generator system under weak grid

“…The potential risk of SSTI between the HVDC and wind farms is given in [46]. Moreover, [47] gave the conclusion that SSTI normally related to the thermal power plant. The scope of this paper is SSR in the DFIG system.…”

Probability Assessment of Characteristics of Sub-Synchronous Oscillation in D-PMSG-Based Wind Power Generation System

“…With the data of SSO frequencies and dampings under 3.5 m/s, 5 m/s, 6 m/s, 7 m/s, 9.5 m/s and 10.5 m/s in Table 1 and Table 4, the functions of f sub = ϕ f (v) and D = ϕ d (v) are obtained with LSM polynomial curve fitting, selecting the orthogonal basis function subspace µ = m/s, respectively, and the standard deviation δ = 3.7 [8] of the location of D-PMSG-based WPGS, and obtain the probability density Weibull distribution function of the wind speed according to (11)- (14). Then use the Monte Carlo method to randomly extract 8000 samples of the wind speed, and the PDFs and CDFs of the SSO frequency and damping caused by the change of wind speed under one D-PMSG and multiple D-PMSGs scenarios are obtained based on the proposed assessment method shown in Fig.…”

“…Because the impedance analysis method ignores the characteristics of controller parameter asymmetry and AC-DC side dynamic coupling, it is difficult to accurately model and analyze the influence of wind speed on SSO [13]. As for the eigenvalue analysis method, which is a rigorous and accurate analysis method based on linear system theory [14], it can be used to accurately analyze the characteristics of SSO under a determined wind speed operation condition.…”