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Shuai Gao - IEEE Xplore Author Profile

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This paper proposes an improved contour-integral algorithm based on exact number counting inside the interesting region to calculate critical eigenvalues of large-scale power systems. Firstly, the difference between the eigenvalues inside and outside the region of the non-hermitian matrix is derived using trapezoidal integral. Based on this difference, a small matrix can be skillfully constructed ...Show More
The grid-connected wind turbine (WT) normally requires the phase-lock loop (PLL) to ensure the integration of wind energy. However, improper settings of control parameters in PLL and weak AC grid condition might bring about negative damping for the system. To overcome these, this paper presents a design of DC voltage synchronization control (DVSC) for permanent magnet synchronous generator (PMSG) ...Show More
This paper proposes an improved stochastic estimation method based on contour integral to estimate the number of critical eigenvalues. The stochastic estimation method transforms the eigenvalue numbers' calculation into summing the traces of a series of inverse matrices. And then, a stochastic strategy is used to estimate the trace of the inverse matrix. However, the method results in an unaccepta...Show More
Sub-synchronous resonance (SSR) has become a serious potential threat for both generators and power grid in the modern power system. To deal with this problem, a voltage source converter (VSC) based controller named sub-synchronous resonance dynamic suppressor (SSRDS) is proposed and designed by genetic algorithm and simulated annealing (GA-SA). The control strategy of the SSRDS and its mechanism ...Show More
Multimodal sub-synchronous resonance (SSR) induced by the interactions between the generator shafts and the fixed series capacitors has become a serious threat for the power system. To overcome this, a voltage source converter (VSC) based controller for multimodal SSR suppression, named sub-synchronous resonance dynamic suppressor (SSRDS), is presented and analyzed in this paper. The controller is...Show More
With the large-scale access of renewable energy, the problem of sub-synchronous oscillation (SSO) caused by the interaction between the direct-drive permanent magnetic synchronous generators (D-PMSGs)-based wind farm and weak AC grid has attracted people's attention. Focusing on this topic, the study presents an analysis of the SSO mechanism by establishing the double input and double output trans...Show More
The STATCOM will have different effects on suppressing sub-synchronous resonance (SSR) phenomenon of the power system when connected to different locations. This paper makes a comparison of the effect of STATCOM connected to different locations for SSR suppression. By analyzing the equivalent circuit structure of the power system with the STATCOM connected to the generator port or grid side, it is...Show More