Feed-forward control method and device of grid-connected inverter, medium and wind generating set

Abstract

The invention provides a feed-forward control method and device of a grid-connected inverter, a medium and a wind generating set. The feed-forward control method can comprise the steps that first voltage is obtained based on capacitance voltage of a capacitor in a filter connected with the output end of the grid-connected inverter; obtaining a second voltage by filtering the capacitor voltage; multiplying the first voltage by a first weighting coefficient to obtain a first weighted voltage; multiplying the second voltage by a second weighting coefficient to obtain a second weighted voltage; adding the first weighted voltage and the second weighted voltage to obtain a feed-forward voltage control component; and controlling the grid-connected inverter based on the feed-forward voltage control component. According to the feed-forward control method and the feed-forward control device of the grid-connected inverter, the current harmonic wave of the grid-connected point can be reduced, and the phase angle stability margin is improved.

Description

technical field [0001] The present invention generally relates to the field of grid-connected inverters, and more particularly, to a feedforward control method and device of a grid-connected inverter, a medium and a wind power generator set. Background technique [0002] As the capacity of wind turbines connected to the power grid gradually increases, the harmonics at the grid-connected point of wind turbines are more and more concerned by power grid companies, and the requirements for the performance of grid-connected inverters are getting higher and higher. [0003] The grid-connected inverters connected to the wind farm are relatively scattered, and the wiring impedance in the field is complex, which requires the grid-connected inverter to have a certain adaptability to the grid impedance and adaptability to a wide range of grid impedance parameters. It can adapt to the operation requirements of both weak power grids and strong power grids. [0004] The grid-connected po...

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Problems solved by technology

[0005] However, grid voltage feedforward will introduce an additional grid-connected current positive feedback loop, which will greatly reduce the stability margin of the system, resulting in a decrease in the robust stability of the system to grid impedance

[0006] Furthermore, the phase angle stability margin when the capacitor voltage is fed forward is also relatively small

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