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Multi-target cooperative control method for doubly-fed wind power generation system under harmonic power grid voltage

A doubly-fed wind power generation and grid voltage technology, applied in wind power generation, single grid parallel feeding arrangement, etc., can solve the problems of not considering the output current capacity of the converter, control target operation restrictions, etc.

Active Publication Date: 2019-05-28
CHONGQING UNIV
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  • Abstract
  • Description
  • 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-target cooperative control method for doubly-fed wind power generation system under harmonic power grid voltage
  • Multi-target cooperative control method for doubly-fed wind power generation system under harmonic power grid voltage
  • Multi-target cooperative control method for doubly-fed wind power generation system under harmonic power grid voltage

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Embodiment Construction

[0044] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

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

[0046] figure 2 It is a structural block diagram showing 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, machine-side positive sequence current control module and machine-side harmonic current loop module 3, grid-side converter 4, grid-side The converter optimal control target selection module 5 , the grid-side positive sequence current control module and the grid-side harmonic ...

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Abstract

The invention discloses a multi-target cooperative control method for a doubly-fed wind power generation system under harmonic power grid voltage. The method relates to the control of a grid-side converter and a rotor-side converter. Harmonic current instruction values of different control targets of the rotor-side converter and the grid-side converter of the doubly-fed wind power generation system are calculated respectively; under the condition of different harmonic distortion rates of the power grid voltage, a control target is selected according to the active power output range of the doubly-fed wind power generation system; the electromagnetic torque ripple of the doubly-fed wind power generation system is obviously inhibited, the pulsation of the total output active power and reactive power of the doubly-fed wind power generation system is inhibited, the output electric energy quality of the system is improved, the operation safety of a transmission shaft system is protected, theservice life of the transmission shaft system is prolonged, and the operation and maintenance cost is reduced.

Description

technical field [0001] The invention relates to a multi-objective coordinated control method of a doubly-fed wind power generation system under harmonic grid voltage, in order to improve the operation performance of a doubly-fed wind farm under grid harmonic conditions, 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 due to their advantages of variable speed and constant frequency operation and small converter capacity. The 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 grid, due to f...

Claims

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Application Information

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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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