Impedance calculation method of double-fed fan rectifier based on double closed loop control

A technology of double closed-loop control and impedance calculation, which is applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc.

Inactive Publication Date: 2018-11-23
SOUTHWEST JIAOTONG UNIV
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Since the rectifier uses switching devices to introduce nonlinear characteristics, the establis

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  • Impedance calculation method of double-fed fan rectifier based on double closed loop control
  • Impedance calculation method of double-fed fan rectifier based on double closed loop control
  • Impedance calculation method of double-fed fan rectifier based on double closed loop control

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Embodiment Construction

[0059] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The impedance calculation method of double-fed fan rectifier based on double closed-loop control provided by the present invention, such as figure 1 As shown, the whole system is mainly divided into two parts: circuit and control. The main steps are: establish the relationship between electrical quantities according to the circuit topology; establish the mathematical model of the control part according to the control block diagram; establish the link between the circuit and the control The mathematical model of the phase-locked loop part; the expression of the closed-loop impedance is derived; and the method of calculating the impedance value by inputting disturbances at different frequencies verifies the correctness of the impedance calculation method. The details are as follows:

[0060] According to Clark coordinate transformation a...

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Abstract

The invention discloses an impedance calculation method of a double-fed fan rectifier based on double closed loop control, comprising establishing a relationship expression between electrical quantityand control quantity according to circuit topology and control block diagram, deriving an expression of the closed-loop impedance and verifying the expression of the closed-loop impedance. Establisha relational expression between the electrical quantity according to the circuit topology, comprising a duty ratio signal, a direct current side voltage, a grid-side voltage and a grid-side current, establish a mathematical model of current inner loop control and voltage outer loop control parts according to the control block diagram, then establish a mathematical model of phase-locked loop part according to relationship between the circuit and the control, and jointly derive an expression of the closed-loop impedance expression; finally, verify the correctness of the impedance calculation method by inputting the disturbance at different frequencies and calculating the impedance value. According to the impedance calculation method of the double-fed fan rectifier based on double closed loopcontrol, a foundation for the stability study of the double-fed fan rectifier is laid, and parameters can be adjusted by impedance analysis to avoid phenomena that harm the power system such as harmonic instability and the like.

Description

technical field [0001] The invention relates to the technical field of stability analysis of a double-fed fan grid-side rectifier, in particular to a method for calculating the impedance of a double-fed fan rectifier based on double closed-loop control. Background technique [0002] As a clean and environmentally friendly green energy, wind energy has received more and more attention in recent years. Doubly-fed induction wind turbine has become one of the mainstream models in the field of wind power generation due to its good grid-connected stability and the advantages of decoupling control of active power and reactive power. However, as a power electronic component, the rectifier has some inherent defects in its structure, which may seriously affect the power quality and stability of the system. Among them, there are phenomena such as harmonic instability, which will not only deteriorate the supply environment of the grid system , causing the control system to be disordere...

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Application Information

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IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 刘志刚刘静
Owner SOUTHWEST JIAOTONG UNIV
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