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Open-loop synchronization method

An open-loop synchronization and voltage signal technology, which is applied in the direction of measuring devices, instruments, and the phase angle between voltage and current, can solve problems such as low detection accuracy, high grid frequency requirements, and complex filter structure, etc., to achieve Fast response speed, high precision, and improved anti-interference effect

Active Publication Date: 2018-01-19
CHINA AGRI UNIV
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Problems solved by technology

[0005] In order to overcome the lack of stability of the closed-loop synchronization technology in the existing synchronization technology, the structure of the closed-loop synchronization using a filter is complex, and the open-loop synchronization technology has too high a requirement for the grid frequency and the detection accuracy is not high. An open-loop synchronization technology is proposed. synchronization technology

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Embodiment Construction

[0032] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] refer to figure 1 , figure 1 It is a flowchart of an open-loop synchronization method provided by an embodiment of the present invention, and the method includes:

[0034] S1, get the three-phase voltage u of the power grid a , u b and u c , and perform Clark transformation on the three-phase voltage to obtain u α and u β , and then undergo the first Park transformation to obtain the first voltage signal and the second voltage signal.

[0035] Specifically, first collect the three-phase voltage of the power grid, where the three-phase voltage includes three data u a , u b and u c , through the Clark transformation, so as to obtain the converted voltage sig...

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Abstract

The invention provides an open-loop synchronization method, and the method comprises the steps: obtaining three-phase voltages ua, ub and uc of a power grid, carrying out the Clark transformation of the three-phase voltages, obtaining u alpha and u beta, carrying out first Park transformation, and obtaining a first voltage signal and a second voltage signal; filtering interference components in the first and second voltage signals through a moving averaging filter, and obtaining a third voltage signal and a fourth voltage signal; carrying out the second Park transformation of the third and fourth voltage signals, and obtaining a fifth voltage signal and a sixth voltage signal; and carrying out the detection of a phase angle of the power grid according to a rotating angle of the first Parktransformation, a rotating angle of the second Park transformation, and the fifth and sixth voltage signals. According to the invention, the method enables a structure to remain stable under any condition, and achieves the higher response speed and precision.

Description

technical field [0001] The present invention relates to the technical field of grid synchronization, and more specifically, to an open-loop synchronization method. Background technique [0002] The consumption of traditional energy and the environmental problems it brings always affect the survival and development of human beings, and sound the alarm for the future development of human beings. At present, the whole world has begun to actively solve this problem: actively develop and apply wind energy, solar energy, geothermal energy, water energy, tidal energy and other renewable energy sources. Due to its rich resources and clean and non-polluting characteristics, renewable energy has attracted worldwide attention and attention. In order to improve the utilization rate of renewable clean energy, it is necessary to connect the renewable energy power generation system and the power system to the grid through a power converter in practical applications. The power converter r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00
Inventor 薛蕙张焱王珂林歆昊
Owner CHINA AGRI UNIV