Direct-drive wind power converter high-voltage ride-through control method

Abstract

The present invention relates to a direct-drive wind power converter high-voltage ride-through control method. The method comprises the following steps: the step 1, obtaining the positive sequence phase angle and the negative sequence phase angle of network voltage; the step 2, obtaining the positive sequence component and the negative sequence component of output current of the converter line side under d-axis and q-axis rotational coordinates; the step 3, performing proportional-resonant (PR) control closed-loop regulation of the positive sequence component and the negative sequence component of output current of the converter line side under d-axis and q-axis rotational coordinates; the step 4, defining the positive sequence reference current Iq* as (img file='DDA0001265780080000011. TIF' wi='525' he='110' / ); and the step 5, performing adaptive adjustment of a reference value Udc* set by the converter direct current bus voltage outer ring according to the amplitude of the network voltage. The direct-drive wind power converter high-voltage ride-through control method employs the positive sequence component and the negative sequence component of output current to commonly control output of modulating waves, employs the proportional-resonant controller to perform closed-loop regulation, performs adaptive adjustment of a reference value Udc* set by the converter direct current bus voltage outer ring according to the amplitude of the network voltage without overmodulation phenomenon, and satisfies the grid-connected harmonic wave requirement.

Description

technical field [0001] The invention relates to a direct-drive wind power generation system, in particular to a high-voltage ride-through control method for a direct-drive wind power converter. Background technique [0002] The power grid system is often due to load switching or line faults and other reasons, resulting in power grid overvoltage phenomenon, which is one of the transient faults of the power grid. As wind turbines are connected to the grid on a larger scale and the interaction between the wind power grid-connected system and the grid, the fault handling capability of wind turbines is particularly important. The grid side of the direct-drive wind power converter is directly connected to the grid. When the grid voltage suddenly rises, not only the power on the grid side cannot be sent out, but the power on the machine side is still flowing into the converter continuously, which will lead to The voltage on the DC bus inside the generator rises rapidly, causing th...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a control method for high-voltage ride-through of direct-drive wind power converters, which is used to solve the problem of short-time ride-through control of direct-drive wind power converters when a high-voltage fault occurs in the grid voltage

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