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Self-adaptive voltage droop control system and method for multi-terminal hybrid DC power transmission system

A self-adaptive voltage and hybrid DC technology, which is applied in the direction of DC network circuit devices, AC network circuits, electrical components, etc., can solve the problems of inaccurate allocation of power changes in multi-terminal hybrid DC transmission systems, power limitations of converter stations, etc., and achieve good results. The effect of technical and economic value, reduction of DC voltage fluctuation, and improvement of accuracy

Pending Publication Date: 2021-05-28
TIANJIN UNIV
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Problems solved by technology

[0003] At present, the traditional droop control cannot accurately distribute the power changes in the multi-terminal hybrid DC transmission system; and when the system is disturbed, the power limit of the converter station using the traditional droop control may occur

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  • Self-adaptive voltage droop control system and method for multi-terminal hybrid DC power transmission system
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  • Self-adaptive voltage droop control system and method for multi-terminal hybrid DC power transmission system

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Embodiment Construction

[0047] In order to further understand the invention content, characteristics and effects of the present invention, the following embodiments are enumerated hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0048] See Figure 1 to Figure 6 , an adaptive voltage droop control system for a multi-terminal hybrid direct current transmission system. The multi-terminal hybrid direct current transmission system includes: a converter A connected to the sending-end AC grid n , n=1,...N, N≥1; Converter B connected to the AC power grid at the receiving end m , m=1,2...M, M≥2; converter A n and converter B m Connection via DC busbar; converter A n commutation converter for the grid, converter B m is a voltage source converter; converter B 1 to B m At least one control system is provided with: an adaptive droop control module, a power outer loop control module, a current inner loop control module and a pulse width modulator; an adaptive ...

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Abstract

The invention discloses a self-adaptive voltage droop control system for a multi-terminal hybrid DC power transmission system. The system comprises a current converter An (n=1,... N, and N> / =1) connected with a transmitting-terminal power grid and a current converter Bm (m=1, 2... M, and M is greater than or equal to 2) connected with the receiving-terminal power grid; the current converter An is a power grid commutation current converter, and the current converter Bm is a voltage source current converter; at least one control system of the current converters B1 to Bm is provided with a self-adaptive droop control module, a power outer loop control module, a current inner loop control module and a pulse width modulator; the self-adaptive droop control module adjusts a droop coefficient through the available power variation, generates a power reference signal to the power outer loop control module through the droop coefficient, and then generates a control pulse to the corresponding current converter through the current inner loop and the pulse width modulator in sequence. The invention also discloses a self-adaptive voltage droop control method of the multi-terminal hybrid DC power transmission system. Thus, the accuracy of converter station power distribution is improved.

Description

technical field [0001] The invention relates to a control method of a power transmission system, in particular to an adaptive voltage droop control system and method of a multi-terminal hybrid direct current transmission system. Background technique [0002] At present, with the massive access of renewable energy and the continuous development of semiconductor devices, the power system has transformed from the traditional AC grid based on synchronous generators to a new power system with power electronics. Due to its good control ability and large-capacity power supply capability, as well as the ability to interconnect power grids of different frequencies, DC transmission is becoming a hot spot for research and development at home and abroad. Although the traditional DC transmission technology based on the commutation converter of the grid is mature, it has disadvantages such as commutation failure and large filter area. The HVDC transmission system based on the voltage sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J1/00
CPCH02J3/36H02J1/00H02J2203/20Y02E60/60
Inventor 朱介北张宇辰葛磊蛟俞露杰
Owner TIANJIN UNIV
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