Multi-objective collaborative control method for doubly-fed wind power generation system under harmonic grid voltage

A doubly-fed wind power generation, grid voltage technology, applied in wind power generation, single-grid parallel feed arrangement, etc., can solve the problems of not considering the output current capacity of the converter, control target operation limit, etc., to improve grid-connected stability , Optimize the effect of running performance

Active Publication Date: 2021-07-27
CHONGQING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the actual output current capability of the converter is not considered, and the control target operation is limited

Method used

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  • Multi-objective collaborative control method for doubly-fed wind power generation system under harmonic grid voltage
  • Multi-objective collaborative control method for doubly-fed wind power generation system under harmonic grid voltage
  • Multi-objective collaborative control method for doubly-fed wind power generation system under harmonic grid voltage

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Embodiment Construction

[0044] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] figure 1 It is a schematic diagram of the structure of a 30MW doubly-fed wind power generation system connected to the power system. The doubly-fed wind turbine is connected to the large power grid through a public connection point.

[0046] figure 2 It shows the structural block diagram of the multi-objective cooperative control method of the doubly-fed wind power generation system under the harmonic grid voltage of the present invention. It includes control objects: rotor-side converter 1, rotor-side converter optimal control target selection module 2, generator-side positive sequence current control module and generator-side harmonic current loop module 3, grid-side converter 4, grid-side Converter optimal control target selection module 5 , grid side positive sequence current control module and grid side harmonic current loop mod...

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Abstract

The invention discloses a multi-objective cooperative control method for a doubly-fed wind power generation system under harmonic grid voltage. The method involves the control of a grid-side converter and a rotor-side converter; In the case of different harmonic distortion rates of the grid voltage, the control target is selected according to the active output range of the double-fed wind power generation system, which significantly inhibits the control of the double-fed wind power generation system. The electromagnetic torque fluctuation suppresses the pulsation of the total output active power and reactive power of the doubly-fed wind power system, improves the system output power quality, protects the operation safety of the transmission shaft, improves its service life, and reduces operation and maintenance costs.

Description

technical field [0001] The invention relates to a multi-objective cooperative control method for a doubly-fed wind power generation system under harmonic grid voltage, in order to improve the operating performance of a doubly-fed wind farm under the harmonic grid condition, and belongs to the field of new energy power generation. Background technique [0002] The proportion of wind power generation in the power system is getting higher and higher. Among them, double-fed wind turbines have become one of the mainstream models of wind power generation systems because of their advantages such as variable speed and constant frequency operation and small converter capacity. A doubly-fed induction machine includes a grid-side converter and a rotor-side converter. The stator winding of the doubly-fed induction motor is directly connected to the grid, and the rotor-side converter and the grid-side converter are connected to each other through a common DC bus. In the actual power gri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48
CPCY02E10/76
Inventor 姚骏孙鹏刘瑞阔刘远赵阳
Owner CHONGQING UNIV
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