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Stability analysis method of rotor-side converter of doubly-fed fan based on speed control

A rotor-side converter and doubly-fed fan technology, applied in wind power generation, AC network to reduce harmonics/ripples, single-network parallel feeding arrangement, etc., can solve problems affecting system stability, harmonic instability, power grid Voltage distortion and other problems, to achieve the effect of accurate impedance calculation results

Active Publication Date: 2018-12-11
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

The inverter is one of the main harmonic sources in the system. After the harmonic current is injected into the grid, it will cause the distortion of the grid voltage. In severe cases, it will affect the stability of the system and cause harmonic instability.

Method used

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  • Stability analysis method of rotor-side converter of doubly-fed fan based on speed control
  • Stability analysis method of rotor-side converter of doubly-fed fan based on speed control
  • Stability analysis method of rotor-side converter of doubly-fed fan based on speed control

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The stability analysis method of the double-fed fan rotor side converter based on speed control provided by the present invention, such as figure 1 As shown, the main steps are: establish the circuit model of the rotor side converter of the double-fed fan under the dq axis; establish the current inner loop control and speed control model according to the control block diagram; establish the mathematical model of the influence of coordinate transformation according to the relationship between the circuit and the control ; and then derive the closed-loop output impedance and return ratio matrix of the rotor-side converter; and use the generalized Nyquist stability criterion to judge the influence of various parameters including wind speed on the stability of the DFIG converter. The details are as follows:

[0036] According to coordinate...

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Abstract

The invention discloses a stability analysis method of a rotor-side converter of a double-fed fan based on rotational speed control, Firstly, the circuit model of the rotor-side converter of the double-fed fan under the dq axis is established, then the current inner loop control and the speed control model are established according to the control block diagram, and the mathematical model of the coordinate transformation influence is established according to the relationship between the circuit and the control. Then the closed-loop output impedance and the back-ratio matrix of the rotor-side converter are derived. The influence of various parameters including wind speed on the stability of the doubly-fed fan converter is judged by the generalized Nyquist stability criterion. A method for analyze stability features that that connection mode of stator and rotor in doubly-fed fan and the influence of wind speed in the conversion of electric energy to mechanical energy are taken into account, Accurate impedance model is established and the influence of each parameter on system stability is analyzed. Harmonic instability and other harmful phenomena harming the power system can be avoidedby adjusting the parameters.

Description

technical field [0001] The invention relates to the technical field of doubly-fed induction wind power generators, in particular to a stability analysis method for a doubly-fed wind turbine rotor side converter based on speed control. Background technique [0002] Doubly-fed induction wind turbine has the advantages of good grid-connected stability and decoupling control of active and reactive power, and has already occupied a non-negligible position in new energy power generation. Among them, the rotor-side converter, as an inverter, is a power electronic device that feeds energy back to the grid, and plays a key role in the entire system. The inverter is one of the main harmonic sources in the system. After the harmonic current is injected into the grid, it will cause the distortion of the grid voltage. In severe cases, it will affect the stability of the system and cause harmonic instability. [0003] The impedance-based stability analysis method can be used to analyze t...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/386H02J3/01H02J2203/20Y02E10/76Y02E40/40
Inventor 刘志刚刘静
Owner SOUTHWEST JIAOTONG UNIV
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