Risk perception and early warning method and system for cascading failures of wind power base

Abstract

The invention relates to a risk perception and early warning method and a system for cascading failures of a wind power base. The method provided by the invention comprises the steps of acquiring real-time operation mode data of a power grid and a wind power plant through SCADA (supervisory control and data acquisition) and a WAMS (wide area measurement system), acquiring possible wind power disturbance of the current power grid by combining with historical data of the wind power plant so as to establish a reasonable failure set, establishing a wind power generating unit dynamic model and a fan safety protection model, simulating dynamic operating conditions of the wind power plant after the power grid breaks down, carrying out power grid transient stabilization analysis after the wind power base breaks down and carrying out static safety analysis after a failure is removed, carrying out calculation and evaluation on the safety stabilization condition of the current power grid after occurrence of the wind power disturbance through a series of indexes which are applicable to early warning for the cascading failures of large wind power bases, analyzing the risk of the occurrence of cascading failures of the large wind power base, and realizing online safety early warning for an electric power system after the wind disturbance. The method and the system provided by the invention are easy to implement, and can visually reflect safe and stable operation conditions of the electric power system including the large wind power base.

Description

technical field [0001] The invention relates to the field of power system simulation and calculation analysis, in particular to a wind power base cascading failure risk perception and early warning method and system thereof. Background technique [0002] The modern power grid has a large scale and complex operation mechanism. While the development of wind power technology provides more opportunities for the power grid, it also faces a series of challenges, which makes the operation and control of the power grid more complicated, and has great impact on the peak regulation, voltage quality, and safe and stable operation of the power grid. greater impact. Due to my country's vast territory, long power supply lines, and most wind farms are far away from the load center, the connected grid structure is relatively weak. Therefore, large-capacity wind turbines are connected to the grid in a concentrated manner, crowding out the transmission capacity of the grid. Especially in the...

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Problems solved by technology

[0011] The safety and stability of the power grid after wind power access is closely related to wind power characteristics, wind power installed capacity, system scale of wind power access to the grid, power structure and layout, and load characteristics. Moreover, wind power is random and intermittent. Traditional offline The stability analysis method cannot meet the requirements. It is necessary to track the operating conditions of the wind farm and the operation mode of the power grid in real time for online analysis, and use the dynamic security assessment and early warning system to realize the online warning of the transient stability of wind power disturbance and the static safety warning of the power grid after the fault is removed.

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