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Three-phase four-wire inverter overcurrent protection method, device and equipment

A three-phase four-wire system and overcurrent protection technology, which is applied in the field of power grids and can solve problems such as burnout of three-phase four-wire system inverters

Active Publication Date: 2020-04-07
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the over-current protection of the three-phase four-wire inverter cannot be carried out in time, it is easy to cause the three-phase four-wire inverter to be burned out.

Method used

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  • Three-phase four-wire inverter overcurrent protection method, device and equipment
  • Three-phase four-wire inverter overcurrent protection method, device and equipment
  • Three-phase four-wire inverter overcurrent protection method, device and equipment

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Embodiment Construction

[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0068] The embodiment of the present invention provides an overcurrent protection method, device and equipment for a three-phase four-wire inverter, which reduces the calculation of the three-phase four-wire inverter when an overcurrent occurs. The amount of calculation of the maximum current per unit value in the current shortens the response time for the overcurrent protection of the three-phase four-wire inverter, and timely implements the overcurrent protec...

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Abstract

The invention provides an overcurrent protection method for a three-phase four-wire inverter, which is applied to the three-phase four-wire inverter. The three-phase four-wire inverter is externally connected to an LCL filter so as to be integrated into a power grid through the LCL filter. Only a current amplitude of one-phase current needs to be calculated as a maximum current amplitude through atype of a fault occurring in the power grid, and so the calculation amount is small. When overcurrent protection is carried out on the three-phase four-wire inverter, the response time is also short.The overcurrent protection of the three-phase four-wire inverter is carried out in time, and so the three-phase four-wire inverter is prevented from being burned out. In addition, the invention alsoprovides an overcurrent protection device and equipment for the three-phase four-wire inverter which have the same effects.

Description

technical field [0001] The invention relates to the field of power grids, in particular to an overcurrent protection method, device and equipment for a three-phase four-wire inverter. Background technique [0002] With the development of science and technology, the demand for energy in various fields is increasing. In order to solve the contradiction between energy shortage, energy utilization, environmental protection and energy demand growth in the process of economic development in various countries, improve energy utilization efficiency and develop new energy , Strengthening the use of renewable energy has become an inevitable choice. Distributed generators composed of renewable energy such as wind energy and light energy. [0003] As the terminal of the power system, the three-phase four-wire distribution network often has unbalanced loads and short-circuit faults, especially single-phase ground faults and two-phase ground faults. The grid inverter can be better appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/122H02J3/38
CPCH02H7/1225H02J3/38
Inventor 袁智勇喻磊马溪原雷金勇陈柔伊段卫国胡洋黄安迪
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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