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Phase-locked-loop-free power grid synchronizing signal detection method with function of dual compensation

A synchronous signal, no phase-locked loop technology, applied in the direction of the phase angle between voltage and current, measuring devices, measuring electrical variables, etc., can solve the problem that the grid voltage synchronous phase detection accuracy is not high enough, and avoid grid voltage jumps. , strong versatility, strong portability

Inactive Publication Date: 2019-03-12
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a double-compensated phase-locked loop-free power grid synchronization signal detection method to solve the problem that the grid voltage synchronization phase detection accuracy is not high enough

Method used

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  • Phase-locked-loop-free power grid synchronizing signal detection method with function of dual compensation
  • Phase-locked-loop-free power grid synchronizing signal detection method with function of dual compensation
  • Phase-locked-loop-free power grid synchronizing signal detection method with function of dual compensation

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Embodiment Construction

[0042] Specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0043] Such as figure 2 and image 3 Commonly shown, a double compensation non-phase-locked loop power grid synchronization signal detection method, comprising the following steps:

[0044] S1. Use the controller to generate the reference sine signal and cosine signal, and obtain the low frequency component with an angular frequency close to 0 and the high frequency with an angular frequency close to twice the grid frequency thro...

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Abstract

The invention discloses a phase-locked-loop-free power grid synchronizing signal detection method with the function of dual compensation. By means of the method, the influence of grid pressure hopping, harmonic waves and frequency fluctuation on base wave synchronizing signals can be effectively avoided, and the portability is strong. The method is suitable for synchronizing phase detection of single / three phases, and has high universality.

Description

technical field [0001] The invention relates to the field of grid phase detection, in particular to a dual compensation non-phase-locked loop grid synchronization signal detection method. Background technique [0002] The detection of grid synchronous signal is one of the key technologies of AC / DC converter control. Voltage phase detection is usually a phase-locked loop (PLL) circuit (principle such as figure 1 shown) or software PLL implementation. The software phase-locked loop has the advantages of low cost, easy implementation, better capture and tracking performance, etc., so the software phase-locked loop is mostly used in the control algorithm. Typical software phase-locked loops include SSRF-SPLL (single synchronous reference frame SPLL, SSRF-SPLL) based on symmetrical component method, decoupled SPLL (decoupled double SRF-SPLL, DDSRF-SPLL) based on double synchronous coordinate system, and second-order based Generalized Integral Phase-Locked Loop Strategy. Howev...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R23/02G01R25/00
CPCG01R19/00G01R23/02G01R25/00
Inventor 熊成林宋智威杨皓黄路雷海冯晓云
Owner SOUTHWEST JIAOTONG UNIV
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