Flexible AC double-feed type wind generating and transmitting system

Abstract

This invention relates to a flexible AC double-feed wind power generating and transmitting system including a double feed wind-power generator, an AC excitation supply, a serial transformer, an inverse parallel two-way thyristor and a monitor devic, in which, the AC excitation supply includes a parallel side converter, a serial side converter and a capacitor, and the AC end of the parallel side converter is connected with the winding of the rotor of the generator, the two DC ends of which and the two DC ends of the serial side converter are connected with the two ends of the capacitor, the AC end of the serial converter is connected with the first winding of the serial transformer, the second winding of which is parallel to the inverse parallel two-way thyristor, one end of the winding is connected with a stator winding of a flywheel energy-stored motor and the monitor realizes by-pass protection by controlling the connection state of the inverse parallel two-way thyristor.

Description

technical field [0001] The invention belongs to distributed power generation technology and flexible AC transmission technology, in particular to a flexible AC double-fed wind power transmission system, which is applied to the power flow control of the distributed power generation system. Background technique [0002] According to my country's wind power planning goals, the national wind power installed capacity will reach 20 million kilowatts in 2020. Therefore, my country's power grid will become a modern hybrid power system with a large number of distributed renewable energy generators. A common feature of renewable energy is discontinuity and instability. Taking wind power generation as an example, the driving force of the wind generator is the wind, and the random fluctuation and intermittent nature of the wind determine that the output characteristics of the wind generator are also fluctuating and intermittent. When the capacity of the wind farm is small, the impact ...

AI Technical Summary

Problems solved by technology

The formation of the combined power grid makes the structure of the power grid increasingly complex. At the same time, the uncoordinated operation and dispatching will cause the power flow distribution in the power grid to be unreasonable, so that the transmission network often appears in the power transmission. , the above-mentioned problems cause a large amount of power loss in the large interconnected power grid or are forced to reduce the transmission capacity of the power grid, and even cause a catastrophe in the power system in severe cases, greatly affecting the operation and scheduling of the entire system

[0005] When the capacity of the distributed generation system accounts for a certain proportion of the capacity of the entire power system, the transmission system of the distributed generation system will also have the so-called "butterfly effect" caused by transmission failures, resulting in an area composed of a large number of distributed generation systems. The collapse of the power grid further caused the voltage collapse of a larger-scale power grid like "dominos" one after another

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