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Phase-locked loop

A phase-locked loop and three-phase technology, applied to the phase angle between voltage and current, automatic power control, instruments, etc., can solve the problems of PLL response speed reduction, reference signal unbalanced design, etc.

Inactive Publication Date: 2014-02-19
ABB TECH AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In some cases, however, reducing the PLL bandwidth may not be an acceptable solution since the response speed of the PLL may therefore also be significantly reduced
[0006] Furthermore, the imbalance of the reference signal can cause problems for designs based on SRF-PLL methods [7], [10]

Method used

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Embodiment Construction

[0020] Some applications may require knowledge of the phase angle of the three-phase reference signal and the magnitude of the underlying positive sequence component. Some applications may also require additional information such as the angular frequency of the reference signal and an estimate of the positive and negative sequences of the fundamental components. For example, this could be three-phase grid connection systems such as power conditioning equipment, flexible AC transmission systems (FACTS), power line conditioners, regenerative drives, uninterruptible power supplies (UPS), grid connection inverters for alternative energy sources, and others The case in distributed generation and storage systems.

[0021] The present disclosure discloses a method for estimating the phase angle of a three-phase reference signal. The method is capable of providing clean estimates of the phase angle and magnitude of the fundamental positive sequence component of a three-phase referenc...

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Abstract

A phase-locked loop for estimating a phase angle of a three-phase reference signal. The phase-locked loop comprises means for calculating an estimated first state and an estimated second state at a fundamental frequency on the basis of the reference signal and the estimated fundamental frequency, means for calculating a fundamental positive sequence component of the reference signal on the basis of the first state and the second state, means for calculating a direct component and a quadrature component in a reference frame synchronous with the phase angle on the basis of the fundamental positive sequence component and an estimated phase angle, and means for determining estimates of the estimated fundamental frequency and the estimated phase angle on the basis of the quadrature component.

Description

technical field [0001] The present invention relates to synchronization with a three-phase reference signal, and in particular to situations where the reference signal is unbalanced and / or subject to harmonic distortion. Background technique [0002] In some applications, it may be important to be able to synchronize to a reference signal. For example, in distributed generation, grid-connected power converters must often be synchronized with the phase and frequency of the utility grid. [0003] A phase-locked loop (PLL) can be used to synchronize with the signal. A PLL can be formed in various ways [1]. For example, Synchronous Reference Frame Phase-Locked Loop (SRF-PLL) [2] is a widely used PLL technique, which is able to detect the phase angle and frequency of a reference signal. [0004] Different designs have been proposed based on the SRF-PLL approach [3]-[7]. Like many other designs, SRF-PLL is based on the assumption of linearizability, that is, results are locall...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08
CPCG01R25/00H03L7/08H02J3/40
Inventor 何艺文格拉尔多·埃斯科巴尔萨米·彼得松
Owner ABB TECH AG