Stability analysis method for doubly-fed fan grid-connected system

A system stability, doubly-fed fan technology, applied in wind power generation, AC network circuit, single-network parallel feeding arrangement, etc., can solve problems such as no research reports.

Active Publication Date: 2019-03-08
YUNNAN POWER GRID
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Problems solved by technology

In DFIG, there are rotor-side converters and grid-side converters at the same time, and the rotor-side co

Method used

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  • Stability analysis method for doubly-fed fan grid-connected system
  • Stability analysis method for doubly-fed fan grid-connected system
  • Stability analysis method for doubly-fed fan grid-connected system

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Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] In the first step, the small-signal impedance model of the converter port on the rotor side of the DFIG is established in polar coordinates. combine figure 1 In the specific example shown, the port characteristics of the rotor converter need to consider the dynamics of the doubly-fed induction motor and the control dynamics of the rotor converter. The rotor-side converter adopts a common phase-locked loop plus double-loop vector control, and the rotor converter satisfies the following assumptions condition:

[0052] Assumption 1: The inner loop control of the converter has voltage feedforward and decoupling items, and the voltage feedforward is considered to be fully compensated. The delay of the PWM modulation link is negligible.

[0053] Assumption 2: Rotor speed ω r and power reference The dynamic response of the motor...

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Abstract

The invention discloses a stability analysis method for a doubly-fed fan grid-connected system, and belongs to the technical field of electrical engineering. According to the method, small signal impedance models of a rotor side converter port and a network side converter port of a double-fed fan are built under polar coordinates; and a small signal impedance model of a network port of a power grid side is built under the polar coordinates. According to the built small signal impedance models of the rotor side converter port and the network side converter port of the double-fed fan, and smallsignal impedance model of the network port, calculation is performed to obtain generalized impedance of the ports of the double-fed fan and generalized impedance of the network port of the power gridside; the two generalized impedances are divided to obtain a corresponding ratio; and the stability of the doubly-fed fan grid-connected system is judged according to a Nyquist criterion. The method can be used for analyzing the stability of the doubly-fed fan grid-connected system, and provides a theoretical foundation for understanding an oscillation mechanism caused after access of large-scalewind power to a power grid.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a method for analyzing the stability of a double-fed fan grid-connected system. Background technique [0002] As the global energy crisis continues to intensify and environmental pollution becomes more and more serious, renewable clean energy power generation represented by photovoltaics and wind energy is receiving more and more attention. my country's energy resources are unevenly distributed, and there is a long-term need for large-scale and long-distance transmission of electric energy. The grid connection of high-proportion renewable energy clusters has become an important trend in the future development of the new energy power generation industry. [0003] Among them, doubly-fed wind turbines require a small converter capacity and low power loss, so they are widely used in wind power generation systems. However, with the increase of the penetrati...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386H02J2203/20Y02E10/76
Inventor 黄伟曾丕江吴琛刘旭斐辛焕海杨超然贺家发
Owner YUNNAN POWER GRID
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