Control method for eliminating DC harmonic voltage for grid-side converter of double-fed wind power generator

A technology for grid-side converters and wind turbines, which is applied to electrical components, output power conversion devices, etc., can solve problems such as no method for separating positive and negative sequence components.

Active Publication Date: 2011-01-12
四方蒙华电(北京)自动化技术有限公司
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Problems solved by technology

In the literature "Research on the Control Strategy of PWM Rectifier under Unsymmetrical Power Grid Fault" (Master's Thesis of Zhejiang University, 2006.07.), the positive and negative sequence components are separated, but only the positive sequence components are considered in the positive sequence synchronous rotating coordinate system, and the establishment of control model, and did not propose a method for separating positive and negative sequence components
The document "VSC transmission operating under unbalanced AC conditions-analysis and control design" (IEEE Transactions On Power Delivery, 2005, 20(1): 427-434.) ba

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  • Control method for eliminating DC harmonic voltage for grid-side converter of double-fed wind power generator
  • Control method for eliminating DC harmonic voltage for grid-side converter of double-fed wind power generator
  • Control method for eliminating DC harmonic voltage for grid-side converter of double-fed wind power generator

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Embodiment Construction

[0044] The technical solution of the present invention will be further described in detail below in accordance with the drawings in the description and in conjunction with specific embodiments.

[0045] The topological structure of the wind turbine grid-side converter is as follows: figure 2 shown. In the figure e a 、e b 、e c is the three-phase grid voltage, i a i b ic is the three-phase input current of the grid-side converter, v a , v b , v c is the input voltage on the AC side of the grid-side converter, L s and R s is the equivalent incoming inductance and resistance, C dc and V dc is the DC side support capacitor and the DC side bus voltage, i loab is the load current on the DC side. The negative-sequence electromotive force component of the power grid will lead to grid-side current distortion. This conclusion can be obtained intuitively by establishing a model of the grid-side converter in the dq coordinate system.

[0046] For converters connected in a th...

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Abstract

The invention discloses a method for eliminating DC harmonic voltage for the grid-side converter of a double-fed wind power generator in the case of asymmetric power grid. The method adopts a phase-shift T/4 delay negative sequence fast separation method, which performs positive-negative sequence separation on the voltage and current of the three-phase power grid, wherein the positive-negative sequence separation method has simple calculation which only includes addition, subtraction, multiplication and division, fast response that the positive-negative sequence component can be worked out only in 5 m and small delay which facilitates the design of PI parameters. In order to obtain good control effect, the positive-negative double-dq current control with completely symmetric structure is adopted. Therefore, the positive-negative sequence current instructions are both DC components and the PI regulator can realize floating control.

Description

technical field [0001] The invention belongs to the field of grid-side converter control strategies in the field of wind power generation, and in particular relates to a method for eliminating DC voltage harmonics under the condition of voltage asymmetry. Background technique [0002] With the deterioration of the earth's environment and the shortage of energy sources, the development of new energy sources is particularly important. Among the current new energy sources, wind power has the most mature technology and the cost closest to conventional energy sources. It has developed rapidly in recent years and played an important role in alleviating the increasingly serious energy crisis and environmental pollution. The current mainstream wind turbine model is double-fed variable-speed constant-frequency wind turbines, which have been widely used due to their advantages such as adjustable power factor, high efficiency, and small capacity of converter devices. [0003] In doubl...

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Application Information

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IPC IPC(8): H02M1/12
Inventor 石山刘志超操丰梅刘树陈秋荣周志超
Owner 四方蒙华电(北京)自动化技术有限公司
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