Transient stability analysis method for power system with doubly-fed wind turbines based on safety domain
A transient stability and power system technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems that do not consider the influence of DFIG
Inactive Publication Date: 2017-11-28
TIANJIN UNIV
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However, in previous studies on DSR, the influence of DFIG was not considered
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[0025] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.
[0026] The present invention is a method for analyzing the transient stability of a power system with doubly-fed wind turbines based on the safety domain, and its implementation flow chart is as follows figure 1 shown, including the following steps:
[0027] Step 1: Determine the fault line L of the power system based on the actual power system data, based on the synchronous generator, double-fed fan and load dynamic model F , Fault clearing time t c , The convergence step size d of the search process for the critical stable point c , extended critical point search disturbance step size d r ; The synchronous generator ignores the biaxial model of the damping winding, wh...
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The present invention discloses a double fed induction generator contained electric power system transient stability analysis method based on a security domain. The method comprises the steps of based on the model parameters, determining the related parameters of an electric power system; setting a Case A as the electric power system in which a double fed induction generator is not accessed; setting a Case B as that the double fed induction generator is accessed in a bus of a power grid to substitute for a synchronous generator on the bus; determining the parameter space of a current electric power system security domain, searching a critical point of the electric power system and fitting a corresponding dynamic security domain boundary; comparing and analyzing the dynamic security domains of the Case A and the Case B; researching the change reason of the dynamic security domain of the electric power system after the access of the double fed induction generator, and analyzing the influence to the electric power system transient stability after the access of the double fed induction generator. The double fed induction generator contained electric power system transient stability analysis method based on the security domain of the present invention uses a hyperplane to fit to inject the boundary of the dynamic security domain of the electric power system containing the double fed induction generator in the power space and within an engineering concerned range, and discloses the influence of the access of the double fed induction generator to the electric power system transient stability.
Description
technical field [0001] The invention belongs to the field of power system stability, and in particular relates to a method for analyzing the transient stability of a power system. Background technique [0002] Modern large-scale wind farms generally use variable-speed constant-frequency units such as Double Fed Induction Generator (DFIG) to improve the efficiency and controllability of wind farms. DFIG has the advantages of flexible control mode, small capacity of frequency conversion device, wide range of speed adjustment and high efficiency, but its dynamic characteristics are quite different from traditional synchronous motors. [0003] With the increase of wind power penetration, the impact of a large number of doubly-fed wind farms on the stability of the power system cannot be ignored. Up to now, scholars at home and abroad have carried out a lot of research on the stability of power systems containing DFIG. However, when the existing literature studies the influence...
Claims
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IPC IPC(8): H02J3/00G06F17/50
CPCY02E60/00
Inventor 秦超余贻鑫曾沅周宝柱刘艳丽
Owner TIANJIN UNIV