DFIG unbalanced power grid voltage compensation method based on phase-locked-loop-free self-synchronization control

A technology of power grid voltage and compensation method, applied in the direction of multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, electrical components, etc., can solve the threat to the operation performance of the unit, and the phase-locked loop cannot quickly and accurately track the power grid Voltage signal, affecting control stability and other issues

Active Publication Date: 2020-11-10
ZHEJIANG UNIV +1
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Problems solved by technology

However, the traditional unbalanced voltage compensation method based on PCC voltage closed-loop has some shortcomings: 1) In the voltage closed-loop, the reference value of the negative sequence voltage can only be set to 0, which will seriously threaten the operation performance of the unit; 2) It is necessary to extract the positive and negati...

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  • DFIG unbalanced power grid voltage compensation method based on phase-locked-loop-free self-synchronization control
  • DFIG unbalanced power grid voltage compensation method based on phase-locked-loop-free self-synchronization control
  • DFIG unbalanced power grid voltage compensation method based on phase-locked-loop-free self-synchronization control

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Embodiment Construction

[0049] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0050] The system implementation of the self-synchronization control DFIG unbalanced power grid voltage compensation method without phase-locked loop of the present invention is as follows: figure 2 As shown, the system mainly includes a 1.65MW DFIG1, a voltage source converter 2 connected to the DFIG rotor winding, a stator three-phase voltage detector 3, a stator three-phase current detector 4, a three-phase coordinate system to a virtual dq coordinate System coordinate transformation module 5, power calculation module 6, negative sequence voltage reference command value calculation module 7, stator flux linkage calculation module 8, rotor position detection optical code disc 9, speed differentiator 10, rotor command reference voltage calculation 11, vi...

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Abstract

The invention discloses a DFIG unbalanced power grid voltage compensation method based on phase-locked-loop-free self-synchronization control, and the method comprises the steps: avoiding the introduction of a phase-locked loop by presetting a fixed rotation angular frequency dq coordinate system on the basis of conventional direct power control, and compensating a power grid voltage unbalanced component by adding a direct resonator, so multi-coordinate transformation is not needed. The system is simple in control structure, and can be used for quickly compensating when the power grid voltageis unbalanced and drops, so the power quality of a power grid is improved. Meanwhile, the method can flexibly set the compensation coefficient, can achieve the full-range compensation of the PCC voltage, and gives consideration to the power quality of a power grid and the operation performance of a unit.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a DFIG unbalanced grid voltage compensation method based on self-synchronization control without a phase-locked loop. Background technique [0002] Since the doubly-fed induction generator (DFIG) has the advantages of small converter capacity and flexible and adjustable power, the proportion of wind turbines based on DFIG in new energy power generation is increasing. The system structure of DFIG generators is as follows: figure 1 shown. At present, most of the wind farms in my country are distributed in remote areas, so the line impedance is relatively large, usually showing the characteristics of a weak grid; under the condition of a weak grid, wind power grid connection points (PCC) usually have large power quality problems, such as voltage fluctuations, voltage unbalanced etc. [0003] Due to the randomness of wind power generation, DFIG-based generators usu...

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Application Information

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IPC IPC(8): H02J3/38H02J3/46H02J3/26
CPCH02J3/26H02J3/381H02J3/46H02J2203/20H02J2300/28Y02E40/50
Inventor 年珩童豪秦世耀李少林贺敬
Owner ZHEJIANG UNIV
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