Novel double-fed wind generating set and run mode thereof

Abstract

The invention provides a novel double-fed wind generating set which comprises a double-fed current transformer, a fan, and a stator return circuit and a rotor return circuit of the fan. The stator return circuit is provided with a short circuit switch. A run mode of the novel double-fed wind generating set comprises the following two specific modes including a mouse cage run mode and a double-fed run mode. The mouse cage run mode includes that connection between the stator return circuit and a power grid is disconnected, the short circuit switch on the stator return circuit is closed, and electric energy generated by the rotor return circuit is transformed through the double-fed current transformer and is output to the power grid. The double-fed run mode includes that the connection between the stator return circuit and the power grid is recovered, the short circuit switch on the stator return circuit is opened, electric energy generated by the stator return circuit is directly output to the power grid, and electric energy generated by the rotor return circuit is transformed through the double-fed current transformer and is output to the power grid. The novel double-fed wind generating set and the run mode of the novel double-fed wind generating set are capable of improving a power curve of the novel double-fed wind generating set in a low wind speed section, improving generating capacity of the low wind speed section, and meanwhile improving low crossing capability of the novel double-fed win generating set. The novel double-fed wind generating set and the run mode of the novel double-fed wind generating set have the advantages of being low in cost, simple to control, easy to achieve and the like.

Description

technical field [0001] The invention relates to the technical field of clean energy, in particular to a design scheme of a novel doubly-fed wind power generating set and its operating mode. Background technique [0002] With the rapid development of wind power in China and the substantial increase in installed capacity, the development of areas with better wind resources has been basically completed. The current wind power owners have increasingly strong requirements for the development of weak wind areas. For a large number of double-fed wind turbines in operation at present, the operating range of the generator depends on the open voltage of the generator and the withstand voltage and capacity of the double-fed converter, which is generally between ±33% of the synchronous speed, such as a typical The speed range of 1.5MW 4-pole fan is generally 1000~2000rpm. In this speed range, the power generation is related to the fan speed. This makes it impossible for the generator ...

AI Technical Summary

Problems solved by technology

[0003] Under this trend, the disadvantages of doubly-fed wind turbines in the low wind speed section are not as good as direct-drive wind turbines.

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