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Back-to-back HVDC transmission system and control method based on virtual synchronous machine

A technology of direct current transmission system and virtual synchronous machine, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., to achieve the effects of reducing rotational inertia, ensuring operational reliability, and good technological advancement

Active Publication Date: 2019-01-15
XJ ELECTRIC +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the current academic research on Virtual Synchronous Machine (VSM) technology only focuses on a single VSC or its frequency modulation and voltage regulation control

Method used

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  • Back-to-back HVDC transmission system and control method based on virtual synchronous machine
  • Back-to-back HVDC transmission system and control method based on virtual synchronous machine
  • Back-to-back HVDC transmission system and control method based on virtual synchronous machine

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Embodiment Construction

[0033] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0034] An embodiment of a back-to-back direct current transmission system based on a virtual synchronous machine of the present invention:

[0035] Such as image 3 VSC-HVDC shown, the system contains two converters VSC 1 and VSC 2 , where VSC1 is the first converter, its active power regulation part performs DC voltage control, VSC 2 is the second converter, and its active power regulation part performs active power control. VSC 1 and VSC 2 The control system consists of two parts: virtual synchronous machine control, current control and modulation. Among them, the virtual synchronous machine control part is composed of the first active power adjustment module, the first reactive power adjustment module, the second active power adjustment module, the second reactive power adjustment module and the virtual synchronous machine body algo...

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Abstract

The invention relates to a back-to-back direct current transmission system based on a virtual synchronous machine and a control method thereof. The system comprises two inverters directly connected tothe direct current side. The difference between the collected actual direct current voltage and the set direct current voltage command is regulated by a regulator to generate a first power difference. Inverting the second mechanical power for active power regulation in the virtual synchronous machine control mode of the second converter, and summed with the first power difference, a first mechanical power which performs active power regulation in a virtual synchronous machine control mode as a first converter, First, the second mechanical power is used for generating the electric angle of thealternating current of the first and second converters. The back-to-back HVDC transmission system based on the virtual synchronous machine technology of the invention can effectively improve the frequency modulation capability of the system and ensure the safe and stable operation of the electric power system under the condition that the installed capacity demand of the generator set is reduced and the equivalent rotational inertia of the electric network is reduced.

Description

technical field [0001] The invention belongs to the field of high-voltage power transmission, and in particular relates to a back-to-back direct current power transmission system and a control method based on a virtual synchronous machine. Background technique [0002] With the adjustment of my country's energy structure and the advancement of power grid construction planning, the flexible DC transmission system has been widely used due to its advantages of independent and flexible controllable active power and reactive power, no need for grid commutation voltage, and power supply to isolated island areas. Developing in the direction of high pressure and large capacity. [0003] At present, the voltage source converter based high voltage direct current transmission system (Voltage Source Converter Based High Voltage Direct Current, VSC-HVDC) based on fully controlled power electronic devices mostly adopts the conventional PI double-loop decoupling based on the synchronous rot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/24H02J3/38H02J3/18
CPCH02J3/18H02J3/24H02J3/36H02J3/38H02J3/388Y02E40/30Y02E60/60
Inventor 杨美娟吴金龙王先为刘永慧姚为正
Owner XJ ELECTRIC
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