A doubly-fed wind power generation system under unbalanced grid voltage and a control method thereof

A double-fed wind power generation and grid voltage technology, which is applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as the double frequency fluctuation and positive sequence component change of the active and reactive power output of the DFIG system that cannot be simultaneously suppressed. , to achieve the effect of enhancing anti-interference ability, good response performance, and avoiding complex operations

Active Publication Date: 2018-12-21
ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER +3
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Problems solved by technology

[0004] However, the above control strategies have the following problems: ①When the grid voltage is unbalanced, the positive sequence component of the grid voltage also changes; the control goal of SGSC in this paper is to make the positive sequence component of the stator voltage equal to the positive sequence component of the grid voltage, and does not make the stator voltage equal to the positive sequence componen

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  • A doubly-fed wind power generation system under unbalanced grid voltage and a control method thereof
  • A doubly-fed wind power generation system under unbalanced grid voltage and a control method thereof
  • A doubly-fed wind power generation system under unbalanced grid voltage and a control method thereof

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[0044] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0045] On the basis of the traditional doubly-fed wind power generation system, the invention connects the SGSC in series with the stator loop, and connects the DC side to the DC capacitor link of the back-to-back PWM converter. Its function is to inject into the stator loop when the grid voltage occurs three-phase imbalance A series voltage makes the stator voltage unaffected by the grid voltage, overcomes the influence of the grid voltage imbalance on the DFIG itself, and improves the stable operation performance of the DFIG under the unbalanced grid voltage. On this basis, by analyzing the...

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Abstract

The invention provides a doubly-fed wind power generation system under unbalanced grid voltage and a control method thereof, The stator side voltage of the fan remains three-phase balance under the unbalanced network voltage by adding a series network-side converter, which ensures the three-phase current balance of the stator and the rotor, and improves the operation performance of the doubly-fedfan under the unbalanced network voltage. Based on the second harmonic generation (SHG) of power generated by series grid-side converter (SSC), a new method based on proportional-difference (DDD) is proposed in this paper. The control strategy of the parallel-networked converter of the resonant power compensator maximizes the power doubling component generated by the parallel-to-grid converter tobe equal to the power doubling component generated by the series-to-grid converter, thereby simultaneously suppressing the active and reactive power doubling fluctuations of the doubly-fed wind powergeneration system, and improving the output quality of the system; The anti-jamming ability of doubly-fed wind power generation system under grid voltage fault is greatly enhanced.

Description

technical field [0001] The invention belongs to the control technical field of a doubly-fed wind power generation system, and more specifically relates to a doubly-fed wind power generation system under an unbalanced grid voltage and a control method thereof. Background technique [0002] With the continuous development and maturity of power electronic technology and automatic control technology, clean energy power generation technology represented by wind power generation has made great progress. Due to the advantages of small converter capacity, decoupling control of active and reactive power, and good operating performance, it has been widely used in wind power generation systems. In practical applications, due to the particularity of the distribution of wind energy resources, many wind farms are located in remote areas where the power grid is relatively weak, and are connected to the main power grid through long transmission lines. Power single-phase loads may cause vol...

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Application Information

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IPC IPC(8): H02J3/26H02J3/38H02J3/24
CPCH02J3/386H02J3/24H02J3/26H02J2203/20Y02E10/76Y02E40/50
Inventor 郑婷婷康祎龙苗世洪刘子文刘卫明王建波韩英昆杨明威陈肖璐张平王达
Owner ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER
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