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A dfig impedance reshaping control method for direct power control without phase-locked loop

A phase-locked loop-free, power control technology, applied in control systems, control generators, generator control circuits, etc., can solve the problems of complex impedance analysis, resonance, and reduction of high-frequency phase margin, so as to improve the phase margin. degree, suppress high-frequency resonance, and ensure the effect of tracking ability

Active Publication Date: 2021-04-16
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the frequency coupling characteristics, the DFIG system impedance will become a multiple-input multiple-output model, which complicates the difficulty of impedance analysis
Although the phase margin of the DFIG system based on direct power control without a phase-locked loop has been improved after the phase-locked loop is removed, but the high frequency has obvious capacitive, which will cause the DFIG system to be prone to inductive weak current There is a potential resonance risk under the grid; and when the degree of frequency coupling increases with parameter changes, the high frequency phase margin of the system decreases and resonance occurs

Method used

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  • A dfig impedance reshaping control method for direct power control without phase-locked loop
  • A dfig impedance reshaping control method for direct power control without phase-locked loop
  • A dfig impedance reshaping control method for direct power control without phase-locked loop

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Embodiment 1

[0045]figure 1 For a DIFG impedance remodeling control block diagram of a non-lock-locked loop direct power control according to the present invention, a DFIG system based on unlocked phase loop direct power control can be in a fixed angular velocity ω.1= 100πRAD / S is implemented in the virtual reference system to avoid grid phase detection. Virtual phase angle θv= Ω1T can be used for coordinate transformation. However, the DFIG based on the direct power control of the lock-locked loop is high-frequency resonance problem in the sensible weaknesses, so the present invention passesfigure 1 The phase margin of DFIG-free-locking rhodo direct power control is improved, and the phase margin of Direct power control of phaseless locked loop is improved. The added virtual impedance is composed of phase remodeling links and filters. The design principle of the phase reshaping link is to make targeted compensation by analyzing the main factors affecting high-frequency resonance. The function...

Embodiment 2

[0061]This embodiment provides a DFIG impedance remodeling control system for direct power control without locked loop, including:

[0062]DFIG Impedance High Frequency Capacitive Analysis Unit: Depending on the equivalent single input single output impedance Birdcha, analyzing the DFIG impedance high-frequency capacitive characteristics of non-locked rings direct power control;

[0063]High frequency resonance analysis unit: According to the DFIG impedance high-frequency capacitive characteristics of non-locked loop direct power control, the cause of high frequency resonance is analyzed by DFIG high frequency simplification model, and the parameter sensitivity is analyzed by DFIG high frequency;

[0064]DFIG impedance remodeling unit: According to the relationship between the frequency coupling characteristic strength and the direct power control of the non-locked ring, the introduction of the voltage feedforward type virtual impedance performs DFIG impedance remodeling, and performs parame...

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Abstract

The invention discloses a DFIG impedance remodeling control method and system without phase-locked loop direct power control. The impedance reshaping control method of the present invention includes the steps of: analyzing the DFIG impedance high-frequency capacitance characteristics of the direct power control without phase-locked loop according to the equivalent single-input single-output impedance Bode diagram; High-frequency capacitance characteristics, through the DFIG high-frequency simplified model, analyze the cause of high-frequency resonance and parameter sensitivity; according to the relationship between the frequency coupling characteristic strength and the DFIG phase margin of direct power control without phase-locked loop The feed-forward virtual impedance is used to reshape the DFIG impedance, and the parameters are designed; according to the equivalent single-input and single-output impedance Bode diagram, the DFIG phase margin and reshaping effect after adding the voltage feed-forward virtual impedance are analyzed. The invention reduces the frequency coupling characteristic of the DFIG system, improves the phase margin of the DFIG under the inductive weak grid, and suppresses high-frequency resonance.

Description

Technical field[0001]The present invention belongs to the technical field of dual feedforward motor control, and is specifically a DFIG impedance remodeling control method and system for direct power control without locked loop.Background technique[0002]As the renewable energy penetration rate is increasing, the wind energy conversion system based on the doubly fedinduction generator, DFIG is widely used in practice. Since DFIG has the characteristics of low cost, high durability and small power rated power, the installed capacity of the DFIG system is increasing.[0003]The phase-locked loop can achieve the synchronization of the DFIG and the grid by getting the grid angle, so it is widely used in the DFIG control system. However, when the DFIG system operates at an unbalanced or harmonic distortion grid voltage, the performance of the conventional phase-locked loop is deteriorated due to the high oscillation of the estimated phase and frequency. . To avoid the influence caused by th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/00H02J3/38H02P101/15
CPCH02J3/381H02P9/007H02P2101/15H02J3/002H02J2203/10H02J2203/20H02J2300/28
Inventor 马骏超黄弘扬彭琰陆承宇
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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