Pre-synchronization method, system and terminal equipment

A pre-synchronization and preset threshold technology, applied in the direction of reducing/preventing power oscillation, AC network circuits, electrical components, etc., can solve problems such as inverter system output fluctuations, phase angle fluctuations, grid phase angles, and frequency mutations. achieve high robustness

Active Publication Date: 2022-04-12
SHIJIAZHUANG TONHE ELECTRONICS TECH CO LTD
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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a pre-synchronization method, system and terminal equipment to solve the problem of the phase-locked phase-locked The phase angle fluctuation of the inverter system will cause the output of the inverter system to fluctuate, which will affect the stability of the inverter system

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  • Pre-synchronization method, system and terminal equipment
  • Pre-synchronization method, system and terminal equipment
  • Pre-synchronization method, system and terminal equipment

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Embodiment Construction

[0038] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0039] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

[0040] figure 1 It is a schematic flowchart of the implementation of the pre-synchronization method provided by an embodiment of the present invention. For the convenience of description, only the parts related to the embodiment of the present invention a...

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Abstract

The present invention is applicable to the technical field of electrical control, and discloses a pre-synchronization method, system and terminal equipment. The method includes: obtaining the real-time angular frequency of the power grid based on the ECAP capture unit; obtaining the angular frequency constructed by the inverter system itself; The linear approximation method gradually approximates the angular frequency constructed by the inverter system to the real-time angular frequency of the power grid. The present invention does not affect the output of the inverter system when the phase angle and frequency of the grid change suddenly, or when the harmonic content of the grid is large, and the inverter system can run stably and has high robustness.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a pre-synchronization method, system and terminal equipment. Background technique [0002] With the depletion of traditional fossil energy, new energy power generation systems such as photovoltaic power generation and wind power generation have sprung up. An inverter system that can operate independently and grid-connected has become a research hotspot in recent years. Grid-connected and islanded operation are There are two normal operating states of the microgrid system, and whether the transition between grid connection and islanding is smooth is the key to judging whether the microgrid system is stable. Therefore, it is of great significance to reasonably design the control scheme of the inverter system. [0003] The traditional island grid-connected switching method uses a PLL phase-locked loop to achieve the same frequency and phase with the grid, that is, to a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40H02J3/38H02J3/24
CPCH02J3/40H02J3/241H02J3/388
Inventor 马群曹会平张浩赵子龙逯曼吴彦
Owner SHIJIAZHUANG TONHE ELECTRONICS TECH CO LTD
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