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A power transmission system adapted to global energy internet and its control method

A technology of energy Internet and power transmission system, which is applied in the field of power transmission system and its control, and can solve the problem of lack of topology structure and control method of power transmission system

Active Publication Date: 2021-09-10
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, it must be DC based on stability and controllability requirements; second, it must be UHV in view of transmission distance, transmission capacity and transmission efficiency requirements; finally, due to environmental and corridor restrictions, UHV DC based on LCC technology and overhead lines It is impossible for power transmission to go deep into every corner of the world, and the existing power transmission system lacks effective topology and control methods

Method used

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  • A power transmission system adapted to global energy internet and its control method
  • A power transmission system adapted to global energy internet and its control method
  • A power transmission system adapted to global energy internet and its control method

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Embodiment 1

[0091] According to the practice of China's power grid and the preliminary discussion, the possible parameters of the transmission scheme proposed by the present invention can be predicted. In this example, the feed end is rated with 800 kV, the rated current is 5000A, and the power is 8000MW, which has successful application experience in China. According to the manufacturing level of the cable, you can select the rated voltage of the VSC-class receiving end of 400 kV.

[0092] When the system is steady-state, the feeding end LCC system controls the transfer terminal output current at 5kA. The total DC voltage of the received end is 800 kV. The VSC class control controls its export DC voltage at 400kV, and the LCC-receiving exit DC voltage is controlled in 400kV. Therefore, when the system is steady-state operation, the DV system is injected into the DC system into the DC system, and the LCC class receiving end and the VSC class receive 4000 mW power, respectively.

[0093] (1) A...

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Abstract

The present invention relates to a power transmission system adapted to the global energy internet and its control method, including a receiving end system and a sending end system, the receiving end system includes a first receiving end and a second receiving end, and the first receiving end includes The LCC converter station, the second receiving end includes at least one VSC converter station, and the first receiving end LCC converter station is connected to the second receiving end VSC converter station through a DC cable; the second receiving end VSC converter station is connected by a DC cable; The end VSC converter station is used for electric energy conversion and feeds into the AC power grid in different regions; control devices are installed in the second receiving end VSC converter station and the first receiving end LCC converter station; the sending end system includes at least One LCC converter station; the LCC converter station of the sending-end system is connected to the first receiving-end LCC converter station of the receiving-end system through an overhead line. The technical solution provided by the invention adopts DC cables and VSCs, which solves the problem of transmitting large-capacity power to developed areas in Europe and the United States where corridors are difficult, and is easy to connect to the local power grid.

Description

Technical field [0001] The present invention belongs to the technical field of DC power transmission, and particularly relates to a control method of a power transmission system to adapt to the global energy Internet. Background technique [0002] Energy development of human society is facing resource constraints, environmental challenges and climate change. Accelerate the development and utilization of renewable energy, the implementation of cleaner alternative energy and alternative energy to build global Internet, it is to promote the energy revolution, the only way to achieve clean development. [0003] Considering the load position differences in resources and non-renewable energy scheduling, it is necessary the formation of large power. The first is the national power grid, such as the United States, Japan, European countries 1950-- currently being made to do the same in the 1980s as well as China, India, Brazil and other countries. Second is to build intercontinental netwo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J13/00
CPCH02J13/0086H02J3/36Y02E60/60Y04S40/128Y02E60/00
Inventor 刘杉余军贺之渊郭贤珊刘杰林畅
Owner STATE GRID CORP OF CHINA
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