Pre-synchronization method and system, and terminal equipment

A pre-synchronization, step-by-step approximation technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of inverter system output fluctuation, affecting inverter system stability, grid phase angle, frequency mutation, etc.

Active Publication Date: 2020-10-27
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 and system, and terminal equipment
  • Pre-synchronization method and system, and terminal equipment
  • Pre-synchronization method and 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 invention is suitable for the technical field of electrical control, and discloses a pre-synchronization method and system, and terminal equipment, and the method comprises the steps: obtaining the real-time angular frequency of a power grid based on an ECAP capturing unit; obtaining an angular frequency self-constructed by the inverter system; and based on a linear approximation method, gradually approximating the angular frequency self-constructed by the inverter system to the real-time angular frequency of the power grid. According to the method, when the phase angle and the frequency of the power grid are suddenly changed or the harmonic content of the power grid is relatively high, the output of the inverter system is not influenced, and the inverter system can stably operate andhas relatively 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 Applications(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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