Transient stability risk assessment method of electric power system containing large-scale wind power station

Abstract

The invention discloses a transient stability risk assessment method of an electric power system containing a large-scale wind power station. The method comprises the following steps: establishing a power grid fault uncertainty model; obtaining a predicated fault set according to a power grid fault; calculating the fault occurrence probability of the predicated fault set; simulating a typical wind speed scene, and carrying out interval division on a wind speed sample; calculating wind speed interval probability; carrying out time-domain simulation analysis on each wind speed scene and a fault scene and constructing a non-linear utility function; calculating to obtain a fault severity degree; calculating a risk index under each scene and obtaining a general transient stability risk index according to the risk index of each scene. The assessment method disclosed by the invention considers the uncertainty of wind speeds and the uncertainty of a system fault state, and a scene simulation and interval probability analysis method is adopted and is used for researching system transient stability under each wind speed scene; the defect of a traditional method that the time consumption is great is overcome; the method for measuring the fault severity degree meets the objective reality better.

Description

technical field [0001] The invention relates to the technical field of power system transient stability risk assessment, in particular to a power system transient stability risk assessment method including a large-scale wind farm. Background technique [0002] With the increasingly severe energy and environmental problems, the utilization of renewable energy has received more and more attention. Among them, wind power is the fastest growing and most mature power generation technology among renewable energy sources. As the scale and capacity of wind farms continue to increase, the impact of wind power access on the security and stability of the power system cannot be ignored. After large-scale wind power is connected to the grid, among the many problems brought to the safe and stable operation of the entire power system, the system transient stability risk deserves special attention, which is of great significance for ensuring the effective access of wind power and grid secu...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for assessing the transient stability risk of a power system with a large-scale wind farm, so as to solve the problems of incomplete uncertainty factors and evaluation results that do not conform to objective reality in the current transient stability risk assessment with a wind farm.

Images