Grid-connected synchronous phase-locked loop based on hybrid filtering unit

A synchronous phase-locked loop and filter unit technology, applied to the phase angle between voltage and current, harmonic reduction device, AC network to reduce harmonics/ripples, etc., can solve slow dynamic response, harmonic sensitivity, etc. problem, to achieve the effect of improving the phase-locking accuracy and optimizing the filtering effect

Pending Publication Date: 2021-06-29
SHENYANG UNIV
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  • Application Information

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Problems solved by technology

Some literatures propose methods such as dq coordinate system delay signal elimination operator (dqDSC) and notch filter (NF) to eliminate the DC offset in the PLL input, but these methods have the disadvantages of slow dynamic response and harmonic sensitivity

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  • Grid-connected synchronous phase-locked loop based on hybrid filtering unit
  • Grid-connected synchronous phase-locked loop based on hybrid filtering unit
  • Grid-connected synchronous phase-locked loop based on hybrid filtering unit

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Embodiment Construction

[0030] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

[0031] Aiming at the problem that the three-phase grid-connected phase-locked loop has insufficient filtering capability and is sensitive to the influence of DC offset when the grid voltage contains harmonics and DC offsets, the present invention provides a three-phase grid-connected system based on a hybrid filter unit PLL.

[0032] Realization principle of the present invention:...

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Abstract

The invention discloses a phase-locked loop based on a hybrid filtering unit, and belongs to the related technical field of power grid voltage phase signal detection and extraction. In order to solve the problem that a traditional three-phase grid-connected phase-locked loop cannot quickly and accurately realize phase locking under the conditions that power grid voltage is distorted and direct current offset voltage is mixed, the traditional three-phase grid-connected phase-locked loop based on a synchronous rotating coordinate system is improved, a hybrid filtering unit is introduced; and by utilizing the characteristic that the DC offset voltage and each harmonic voltage of the power grid voltage can be filtered at the same time, the method has the advantages of high filtering performance, strong anti-interference capability, fast dynamic response and the like. The phase-locked loop is mainly used for voltage phase detection when the power grid voltage is distorted and the direct current offset voltage is mixed.

Description

technical field [0001] The invention relates to the technical field of grid voltage phase detection and harmonic suppression, in particular to a grid-connected synchronous phase-locked loop based on a hybrid filter unit. Background technique [0002] With the development of new energy technology, more and more new energy power generation equipment such as wind power generation and solar power generation are integrated into the grid for operation, providing power to the grid, and obtaining grid synchronization signals such as the frequency, phase, and amplitude of the grid voltage is completed and The premise and foundation of network operation. [0003] The ideal grid phase-locked loop technology can effectively detect the synchronization signal of the grid in real time, and has been widely used. However, due to the connection of a large number of power electronic loads such as uncontrollable rectification and reactive power compensation to the grid, voltage imbalance or ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00H02J3/01
CPCG01R25/00H02J3/01Y02E40/40
Inventor 回楠木韩晓微吴宝举李云路
Owner SHENYANG UNIV
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