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The tie-line power oscillation of two-area interconnected system after power impact is derived strictly. The dynamic equations before the disturbance and after the disturbance are constructed and the variation of the tie-line power is derived. Based on the theory of distribution of impact power in power systems, the tie-line power of two-area system after power impact is derived. The expressions of...
In this paper the coordination of the low voltage ride through capability and the crowbar protection of DFIG are discussed. Different protection strategies for over-current and low voltage protection are presented. Effect of different short-circuit impedance, different wind generator pre-fault output power and different fault types on transient stability of connected grid are studied. Simulation in...
As a clean renewable energy, wind energy draws more and more attention around the world. In case of high wind speed or low speed but substantial installed wind power capacity, wind turbine generators (WTGs) will take the place of traditional power plant partly. Under the circumstance, the transient stability will change. Therefore, in this article, the synthetical dynamic model of WTG is introduced...
In this paper the analysis of small signal stability of grid-connected doubly fed induction generators (DFIG) is presented. The detailed model of grid-connected DFIG wind turbine is firstly established, and the eigenvalues are classified and characterized based on participation factors. Then the modal analysis including its converter and pitch controllers is studied, and model simplification of the...
As the level of wind power penetration into the grid increases, reactive power control will become more critical for wind farms with fixed-speed wind turbine generators. Capacitor banks are used for reactive power compensation in wind power plant (WPP). This paper focuses on our effort to develop a method to determine the number, sizes and control strategy of capacitor banks. To solve this problem,...
Based on eigenvalue analysis of small signal stability analysis, mechanism of large power oscillations of inter-area lines caused by local mode is studied by right eigenvector characteristic and generator power-angle characteristic. Eigenvalue of local mode is changing with running conditions and relations between the elements of right eigenvector of all generators also are changed. When power deviations'...
The impact of load characteristics and the low-voltage load shedding schedule on dynamic voltage stability is studied for part of the power grid in Beijing. The research is conducted on a real-time digital simulation (RTDS) system and based on the projected data for the power grid in the Northern China region. We show that under severe shortage of active power, the larger proportion of asynchronous...
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