A method of using the rotational kinetic energy of permanent magnet synchronous fan to improve the damping of power system

Abstract

A method for using the rotational kinetic energy of a permanent magnet synchronous draught fan for improving electric system damping comprises the following steps: step A, a parameter estimation method of a total least squares-rotation invariant subspace algorithm is used for identifying an inter-area oscillation mode frequency omega d according to a power fluctuation signal delta Pac of a tie line; step B, under a perturbation, the phase angle difference phi 2 between a fan rotor speed omega and wind power Pd is measured, the phase angle difference between the wind power Pd and an inter-area inertia center angular frequency omega COI is phi 1, and a phase angle phi 3 which needs compensation is calculated, wherein the phi 3 is equal to the sum of the phi 1 and the phi 2; then, a phase compensation method is used for setting a first time constant Ta and a second time constant Tb in a phase compensation link and a gain factor K in a gain link in a supplementary damping controller for the permanent magnet synchronous draught fan; step C, an inversion signal -Pac of the tie line is input into the supplementary damping controller so as to output a signal to adjust the rotating speed of the draught fan, wherein the signal is a draught fan rotating speed adjustment signal omega damp; therefore, the rotational kinetic energy of the draught fan is used for improving the electric system damping.

Description

technical field [0001] The invention relates to a method for improving the damping of a power system by using the rotational kinetic energy of a permanent magnet synchronous fan. Background technique [0002] Vigorously developing wind power is an important development direction of my country's future energy strategy. At present, several large-scale wind power bases are being built in my country. The National Energy Administration issued the "Twelfth Five-Year Plan for Wind Power Development", which proposed the development goals, development layout and construction priorities of my country's wind power from 2011 to 2020. Among them, the planning of wind power in 2015 and The installed capacity of the grid will reach 100 million kilowatts, and it will exceed 200 million kilowatts by 2020. According to the national plan, focus on the construction of 9 large-scale wind power bases in Hebei, Eastern Mongolia, Western Mongolia, Jilin, Gansu, Shandong, Jiangsu, Xinjiang and Heilo...

AI Technical Summary

Problems solved by technology

At present, permanent magnet synchronous fans have been widely used in wind power generation, but because the output power of permanent magnet synchronous fans is decoupled from the grid frequency, the output wind power does not respond to grid disturbances, so the current permanent magnet synchronous fans cannot provide damping for the grid

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