Small signal stability analysis method for power system including asynchronous wind farm based on safety domain

Abstract

The invention discloses a small signal stability analysis method for a power system including an asynchronous wind farm based on a safety domain, and the method comprises the steps: (1), determining asynchronous generator, an asynchronous fan and a control system thereof and network frame topology parameters, setting a scene without the asynchronous wind farm as a scene A, and setting a scene with the asynchronous wind farm as a scene B; (2), carrying out the feature value analysis of the rated operation states of the scenes A and B, and carrying out the screening to obtain an electromechanical oscillation mode in a system; (3), carrying out the disturbing of the active output and reactive compensation capacity of the asynchronous wind farm in the scene B and the active output of the synchronous wind farm, recalculating a feature value, analyzing the change of the damping of the electromechanical oscillation mode, and constructing a parameter space of the small signal stability domain; (4), searching small signal stability critical points in the scenes A and B, and constructing a small signal stability of the scene A and a small signal stability of the scene B; (5), comparing thechanges of the small signal stability domains of a system in the scenes A and B, and analyzing the impact on the small signal stability of the system from the asynchronous wind farm grid connection.

Description

Technical field [0001] The invention belongs to a power system analysis method, and in particular relates to a small disturbance stability analysis method of a power system containing an asynchronous wind farm based on a security domain. Background technique [0002] The increasing problems of environmental pollution and energy crisis have made the development and utilization of clean renewable energy a consensus. Wind power is currently recognized as one of the most mature renewable energy sources with the greatest development potential. Compared with traditional thermal power plants, asynchronous fans, doubly-fed fans and permanent magnet direct drive units widely used in wind power plants have static / dynamic characteristics different from synchronous generators. In particular, asynchronous fans need to absorb reactive power from the system, which can be Poor control. With the large-scale grid connection and long-distance transmission of wind power, the safe and stable operat...

AI Technical Summary

Problems solved by technology

The variability, intermittency and uncertainty of wind power make the operation mode of the system more complex and changeable. With the help of the "point-by-point method", only a few specific operation modes can be analyzed for safety and stability, and it is difficult to completely cover all aspects of the system after the wind power is connected. possible mode of operation

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