High-voltage ride-through method for double-fed wind turbine generator set

Abstract

The invention provides a high-voltage ride-through method for a double-fed wind turbine generator set. The high-voltage ride-through method comprises the following steps of 1, collecting a three-phase voltage U<abc> of a grid-connection point of the double-fed wind turbine generator set, and calculating a fundamental wave positive sequence voltage U1 according to the three-phase voltage U<abc>; and 2, determining whether the generator end voltage of the double-fed wind turbine generator is increased or not according to the value of the fundamental wave positive sequence voltage U1, if so, enabling a rotor side current convertor to start a reactive voltage compensation control strategy, and enabling a grid side current converter to start a direct current side voltage control strategy so as to realize high-voltage ride-through of the double-fed wind turbine generator set. Compared with the prior art, a hardware protection circuit is not required to be added within a 130%Un range by adoption of the high-voltage ride-through method for the double-fed wind turbine generator set provided by the invention; and the high-voltage ride-through of the double-fed wind turbine generator set can be realized by only coordinative control of the rotor side current convertor and the grid side current converter of the double-fed wind turbine generator set.

Description

technical field [0001] The invention relates to the field of new energy access and control, in particular to a high-voltage ride-through method for a doubly-fed wind turbine. Background technique [0002] The grid-connected operation of large-scale wind power has brought some negative impacts on the safe and stable operation of the power system. The world's major wind power developed countries have successively formulated wind power grid-connected guidelines to regulate the grid-connected behavior of wind power. Among them, the low-voltage ride-through of wind power The ability has attracted much attention. After continuous research and engineering practice, the low-voltage ride-through technology of double-fed wind turbines based on the crowbar on the rotor side and the chopper discharge resistor on the DC side has been widely used in engineering applications, and the low-voltage ride-through capability of wind power has been significantly enhanced. [0003] However, low vo...

AI Technical Summary

Problems solved by technology

Invention patent "A doubly-fed wind turbine high-voltage ride-through control method", patent number 201310102599, provides a dual energy consumption circuit based on the rotor crowbar and the DC side chopper, which controls the rotor current and the DC bus voltage within its own tolerance range However, this method requires the design of additional hardware protection circuits, and when the Crowbar operates, the wind turbine will be in a power out of control state, which is not the preferred solution for high voltage ride-through of the double-fed wind turbine

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