Damping control method and system for electric power system provided with plurality of wind turbines

Abstract

The invention provides a damping control method and system for an electric power system provided with a plurality of wind turbines. The damping control method comprises the following steps: measuring wind turbine connecting line power signals and inter-regional communication connecting line power signals to obtain wind turbine connecting line power fluctuation signal sequences and inter-regional communication connecting line power fluctuation signal sequences; constructing an electric power system state space model according to the signal sequences in conjunction with a sub-space state space identification algorithm for the electric power system, wherein the model comprises a system matrix; calculating a dominant oscillation mode of the system matrix, and acquiring controllability of the wind turbine connecting line power fluctuation signal sequences to the dominant oscillation mode; selecting wind turbines to be equipped with additional damping controllers according to the controllability; and designing additional damping controller models through a phase compensation method, inputting the inter-regional communication connecting line power fluctuation signal sequences into the additional damping controllers, and outputting a wind turbine rotation speed adjusting signal to increase damping. Through the technical scheme of the invention, the effect of restraining low-frequency oscillation of the electric power system can be enhanced.

Description

technical field [0001] The invention relates to the technical field of wind power control, and more specifically, to a damping control method and system for a power system including multiple wind turbines. Background technique [0002] With the continuous shortage of fossil energy, wind power has become an important development direction of the future energy strategy of various countries. Wind power has the characteristics of cleanliness and low cost, and wind power has become one of the renewable energy technologies recognized in the world that is closest to large-scale commercialization. [0003] However, with the integration of new energy sources such as large-scale wind power into the grid, the long-distance large-capacity power transmission process may deteriorate the damping characteristics of the power system. Low-frequency oscillation threatens the safe and stable operation of the power grid. In order to suppress low-frequency oscillations, existing literature has ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a technical solution for the coordinated damping control of multiple fans, so as to solve the problem that the parameters of the additional damping controller in the power line system containing multiple fans in the prior art introduced in the background art are not optimal and the coordinated control is not strong , the problem that the suppression effect on the low-frequency oscillation of the power system is not strong

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