A low-voltage ride-through control method for self-enclosed electromagnetic coupling speed-regulated wind turbines

Abstract

The invention provides a low-voltage ride-through control method for a self-sealing type electromagnetic coupling speed-regulating wind generation set, aiming at solving the problem that current double-feedback type and full-power conversion type wind generation sets and a synchronous power generator in a conventional power plant have different gird-connected interfaces. The invention provides the low-voltage ride-through control method for the self-sealing type electromagnetic coupling speed-regulating wind generation set. A self-sealing type electromagnetic coupling speed-regulating device is jointed with a gearbox high-speed shaft and an electrical excitation synchronous power generator rotor shaft and power is transmitted to the side of an electrical excitation synchronous power generator from the side of a gearbox; and a gird-connected interface is the electrical excitation synchronous power generator. According to the self-sealing type electromagnetic coupling speed-regulating wind generation set and the control method thereof, pollution to a power grid, which is possibly caused by the connection of a frequency converter and the power grid, is avoided, and the gird-connected interfaces of the wind generation set and the conventional power plant are the same; and a power grid friendly type target of the wind generation set is really realized and further development of wind power, namely a clean energy source, is facilitated.

Description

technical field [0001] The invention relates to the field of wind power, in particular to a control method for a self-enclosed electromagnetic coupling speed-regulating wind turbine. Background technique [0002] The current mainstream wind turbines are doubly-fed and full-power conversion wind turbines, both of which can change the speed of the wind rotor with the change of wind speed, thereby realizing the ability to capture wind energy to the maximum. However, as the proportion of wind power in the power grid increases, the demand for wind turbines to participate in supporting the voltage and frequency of the power grid continues to increase. In these two aspects, the current wind power generation unit has shortcomings compared with conventional power generation units. [0003] In terms of grid voltage support, the stator of the generator in the doubly-fed wind turbine is directly connected to the grid, and a drop in the grid voltage will cause overcurrent of the stator a...

AI Technical Summary

Problems solved by technology

However, since power electronic switchgear is very sensitive to overvoltage and overcurrent, overvoltage or overcurrent may cause damage to the switchgear in a short period of time, so the overload capacity of power electronic switchgear is very limited compared with synchronous generators , which makes it difficult for the reactive power generated by doubly-fed and full-power conversion wind turbines to support the grid voltage when the grid voltage drops

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