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

A technology of DC transmission system and virtual synchronous machine, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., to achieve the effect of reducing rotational inertia, improving frequency modulation capability, and realizing seamless switching.

Active Publication Date: 2021-04-20
XJ ELECTRIC +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 DC transmission system and control method based on virtual synchronous machine
  • Back-to-back DC transmission system and control method based on virtual synchronous machine
  • Back-to-back DC 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 DC power transmission system and a control method based on a virtual synchronous machine. The system includes two converters directly connected to the DC side, and the difference between the collected actual DC voltage and the set DC voltage command is regulated by a regulator , to generate the first power difference; the second mechanical power for active power adjustment in the virtual synchronous machine control mode of the second converter is reversed, and summed with the first power difference, as the virtual power of the first converter The first mechanical power for active power adjustment in the synchronous machine control mode, the first and second mechanical powers are used to generate the electrical angle of the first and second converter alternating currents, the present invention is based on the back-to-back DC power transmission system of virtual synchronous machine technology, It can effectively improve the frequency modulation capability of the system and ensure the safe and stable operation of the power system under the condition that the demand for the installed capacity of the generator is reduced and the equivalent rotational inertia of the power grid 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 Patents(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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