Method for restraining imbalance and deformation of double-feedback type wind generator set stator current

Abstract

The invention relates to a method for restraining the current imbalance and aberrance of a stator of a double-feed wind generating set. The voltage of the stator as well as the positive sequence component and the non-positive sequence component of a fundamental wave of the current are obtained by detection and calculation; by comparing and adjusting the active power and the reactive power which are calculated by the specified values of a master active power and a master reactive power, the voltage at the stator side and the positive sequence component and transformation of coordinate, the specified value of the positive sequence current of a rotor in a static coordinate system is obtained; the specified value of the control quantity of a rotor three-phase current restraining the current imbalance and aberrance of the stator is obtained by the non-positive sequence component by calculation, overlapped with the specified value of the positive sequence current of the fundamental wave of the rotor; after adjustment, the specified value of the voltage of the rotor is output which is used for controlling an inverter at the rotor side to feed a needed field current to a rotor winding of the double-feed generator; thereby restraining the adverse effects caused by the current imbalance and aberrance of the stator by detecting the voltage of the stator and the positive sequence component and the non-positive sequence component of the fundamental wave of the current as well as carrying out overlapping control of the rotor current.

Description

technical field [0001] The invention relates to a method for suppressing the unbalance and distortion of the stator current of a double-fed wind power generating set, and belongs to the control field of the double-fed wind power generating set. Background technique [0002] Double-fed wind power generation technology is the mainstream technology widely used in large-scale wind turbines. This technology controls the rotor current of the generator through the power electronic converter, so that the wind generator can realize variable speed and constant frequency operation, which greatly improves the While improving the power generation efficiency, it realizes the independent adjustment of the output active power and reactive power of the generator. Compared with the direct-drive variable-speed constant-frequency wind power generation technology, the capacity of the power electronic converter is small, and the total cost of the unit is also greatly reduced. [0003] The doubly...

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Problems solved by technology

[0018] The technical problem to be solved by the present invention is to propose a method for suppressing the doubly-fed wind power generation system for the existing control technology of the doubly-fed wind power generating set, in view of problems such as heating and vibration caused by ignoring the system voltage imbalance or distortion. The Method of Stator Current Unbalance and Distortion of Generating Set

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