Control method for grid-connected operation of open-winding doubly-fed wind turbines in microgrid

Abstract

The invention relates to a control method for grid-connected operation of an open-winding doubly-fed wind power generator in a microgrid. By analyzing the power flow distribution state of the open-winding doubly-fed wind power generator under the grid-connected condition, the power range of the open-winding doubly-fed motor body and its system is obtained Limit, according to the power flow distribution of open-winding doubly-fed wind power generation equipment under grid-connected conditions, calculate the active power flow state and reactive power flow state, and finally classify according to the power flow characteristics of the equipment system, combined with grid-connected open-winding doubly-fed wind turbine The control strategy is constructed under the two modes of unit power factor operation and constant flux linkage operation, which solves the problem that the grid-connected open-winding doubly-fed motor cannot perform stable flux linkage control.

Description

technical field [0001] The invention belongs to the field of distribution network operation control, in particular to a control method for micro-grid open-winding doubly-fed wind generator grid-connected operation. Background technique [0002] Doubly-fed wind turbines have occupied a pivotal position in the field of new energy power generation. In the traditional grid-connected power generation mode of doubly-fed wind turbines, the system controls the stator current indirectly. And the system cannot fully control the total current. At the same time, the system cannot realize functions such as direct reactive power compensation, power quality control, and harmonic imbalance control, and has the disadvantages of complex system control and poor control effect. [0003] The neutral point of the open-winding doubly-fed wind turbine stator can be used to connect the converter in series. Under grid-connected conditions, the grid voltage is the vector sum of the stator voltage of ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a control method for the grid-connected operation of the open-winding doubly-fed wind power generator in the microgrid, which can solve the problem that the grid-connected open-winding doubly-fed wind power generator cannot perform stable flux linkage control

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