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Control and Operation Method of Current Source HVDC Transmission System

A high-voltage DC, current source technology, applied in power transmission and AC networks, etc., can solve the problems of fast rising speed, large short-circuit current, and difficulty in rapid removal or isolation of short-circuit fault protection, so as to improve flexibility, economy, and good performance. running effect

Active Publication Date: 2021-10-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the capacitance of the DC bus in the voltage source HVDC transmission system, the short-circuit fault poses a huge challenge to the HVDC transmission system. difficult to protect

Method used

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  • Control and Operation Method of Current Source HVDC Transmission System
  • Control and Operation Method of Current Source HVDC Transmission System
  • Control and Operation Method of Current Source HVDC Transmission System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Embodiment 1: as figure 1 As shown, the present invention provides a current source type high-voltage direct current transmission system, including:

[0095] The AC grid 1.14 of the power system 3 at the receiving end, which is connected to the primary side of the isolation transformer 1.13;

[0096] The secondary side of the isolation transformer 1.13 is connected in parallel with the three-phase filter capacitor 1.12, and connected in series with the current source inverter 1.11;

[0097] The current source inverter 1.11 is connected in series with the smoothing reactors 1.5 and 1.6 of the power system 1 at the transmission end through smoothing reactors 1.9 and 1.10 and two DC bus cables 1.7 and 1.8;

[0098] The smoothing reactors 1.5 and 1.6 of the power system 1 at the transmission end are connected to the current source rectifier 1.4;

[0099] The current source rectifier 1.4 is connected in parallel with the three-phase filter capacitor 1.3, and connected in s...

Embodiment 2

[0107] Embodiment 2: as figure 2 As shown, the present invention provides a current source multi-terminal direct current transmission system connecting an offshore wind farm and an onshore power system, including:

[0108] The AC grid 2.14 of the power system 3 at the receiving end, which is connected to the primary side of the isolation transformer 2.13;

[0109] The secondary side of the isolation transformer 2.13 is connected in parallel with the three-phase filter capacitor 2.12 and connected in series with the current source inverter 2.11;

[0110] The current source inverter 2.11 is connected in series with the smoothing reactors 2.5 and 2.6 of the offshore wind farm 1 through smoothing reactors 2.9 and 2.10 and two DC bus cables 2.7 and 2.8;

[0111] The smoothing reactors 2.5 and 2.6 of the offshore wind farm 1 are connected to the current source rectifier 2.4;

[0112] The current source rectifier 2.4 is connected in parallel with the three-phase filter capacitor 2...

Embodiment 3

[0118] Embodiment 3: as image 3 As shown, the present invention provides a current source type high-voltage direct current transmission system capable of supplying power to a passive electrical network, including:

[0119] An AC grid 3.1 in a distributed power system, which is connected to a three-phase filter inductor 3.2;

[0120] The three-phase filter inductor 3.2 is connected in parallel with the three-phase filter capacitor 3.3, and connected in series with the current source rectifier 3.4;

[0121] The current source rectifier 3.4 is connected in series with the current source inverter 3.6 through the DC bus inductor 3.5;

[0122] The current source inverter 3.6 is connected in parallel with the three-phase filter capacitor 3.7 and connected in series with the three-phase filter inductor 5.8;

[0123] The three-phase filter inductor 3.8 is connected in series with the main grid 3.10 through a circuit breaker 3.9, and connected in parallel with the three-phase load 3....

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Abstract

The invention discloses two kinds of current source type multi-terminal DC power transmission systems connecting multiple power systems and a current source type high-voltage DC power transmission system capable of supplying power to passive power networks, including: a power system consisting of two power transmission terminals and A current-source multi-terminal direct current transmission system composed of a power system at the receiving end; a current-source multi-terminal direct current transmission system composed of two offshore wind farms at the sending end and an onshore power system at the receiving end; A current source HVDC power transmission system composed of a source distributed power system that can supply power to a passive electrical network. The invention also discloses the corresponding control technologies of the three systems, and the protection strategy independent of the DC circuit breaker in the case of a DC fault of the current source multi-terminal DC transmission system composed of multiple power systems, so that the system can operate effectively. This technical solution reveals the effectiveness of the current source converter for multi-terminal direct current transmission and power supply to passive power networks.

Description

technical field [0001] The invention belongs to the field of multi-terminal high-voltage direct current transmission systems, and in particular relates to several current source type multi-terminal high-voltage direct current transmission systems and operating methods. Background technique [0002] In order to solve the shortage of traditional energy and the increasing environmental degradation, countries around the world have begun to realize the importance of transitioning from clean traditional energy to clean energy. However, limited by the capacity of the power system, most renewable energy has not been effectively utilized, and even the phenomenon of "abandoning wind" and "abandoning light" has occurred. Due to the intermittent nature of new energy generation, AC power grids cannot directly accept new energy sources. High-voltage direct current transmission and direct current power grids are one of the effective technical means to solve this problem. [0003] With the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 王政刘鹏程徐阳程明
Owner SOUTHEAST UNIV