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Hybrid direct current transmission system and control method thereof

A technology of hybrid direct current transmission and control method, which is applied in the direction of electric power transmission and alternating current network, etc., which can solve the problems such as the inability to directly complete the system starting and unlocking, and achieve the effects of ensuring reliability, realizing safe starting and improving reliability

Active Publication Date: 2019-11-08
XUCHANG XJ SOFTWARE TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a hybrid direct current transmission system and its control method, which is used to solve the problem that the hybrid direct current transmission system cannot directly complete the system start and unlock process according to the conventional direct current engineering structure.

Method used

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  • Hybrid direct current transmission system and control method thereof
  • Hybrid direct current transmission system and control method thereof
  • Hybrid direct current transmission system and control method thereof

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] System embodiment:

[0028] The hybrid direct current transmission system of this embodiment is a FBMMC-LCC type hybrid topology, such as figure 1 , 2 As shown, including the sending-end converter station and the receiving-end converter station, the sending-end converter station includes at least one FBMMC valve group, using a full-bridge FBMMC converter, and the receiving-end converter station includes at least one LCC valve group, using Traditional LCC converter. The sending-end converter station and the receiving-end converter station are connected by a DC line.

[0029] The control of this system consists of three stages, such as Figure 5 As shown, they are the pre-charging phase, starting phase, and steady-state phase respectively....

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Abstract

The invention relates to a hybrid direct current transmission system and a control method thereof. The starting and unlocking of an MMC-LCC hybrid DC transmission system is achieved through coordination between DC current control configured by a sending end converter station and the constant DC voltage control of a receiving end converter station, the safe starting of the hybrid DC transmission system is achieved, and the receiving end converter station reliably enters the active inversion state to reduce the risk of the cut-off of the starting and unlocking stage of the receiving end converter station, improve the reliability of the starting and unlocking of the hybrid DC transmission system and ensure the reliability, the safety and the stabilization of the hybrid DC transmission system.

Description

technical field [0001] The invention belongs to the technical field of hybrid direct current transmission, and in particular relates to a hybrid direct current transmission system and a control method thereof. Background technique [0002] The rapid development of modern power systems and the upgrading of power electronics technology have made great progress in DC transmission systems based on Modular Multilevel Converter (MMC) technology. The MMC converter has many advantages such as independent control of active and reactive power, no commutation failure, and power supply for passive island systems. At the same time, the MMC system also has the advantages of low switching frequency, small switching loss, no need for AC filter banks, and strong scalability, which makes MMC gradually realize engineering applications and can be used in high DC voltage and high-power transmission occasions. [0003] The structure of a conventional DC project is: the rectification side at the ...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 周晓风戴国安李瑞生倪传坤崔晨康建爽孙巍峰李星奎付艳李传西雷玉磊
Owner XUCHANG XJ SOFTWARE TECH