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DC voltage slope control method for multiterminal flexible DC power transmission system and system

A DC transmission system and DC voltage technology, applied in the electrical field, can solve problems such as inability to achieve constant voltage control

Active Publication Date: 2016-01-13
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a DC voltage slope control method and system for a multi-terminal flexible DC transmission system that can achieve power balance and voltage constant control in view of the problem that current methods cannot achieve constant voltage control

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  • DC voltage slope control method for multiterminal flexible DC power transmission system and system
  • DC voltage slope control method for multiterminal flexible DC power transmission system and system
  • DC voltage slope control method for multiterminal flexible DC power transmission system and system

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Embodiment Construction

[0042] see figure 1 , the multi-terminal flexible direct current transmission system includes at least two converters, at least one converter as the sending end, at least one converter as the receiving end, the sending end converter and the receiving end converter are connected through a direct current transmission line, each The sending-end converter transmits the DC power to the DC transmission line through the common point, and transmits the DC power to each receiving-end converter through the DC transmission line. In this embodiment, the multi-terminal flexible direct current transmission system includes 4 converters, wherein 2 converters serve as sending-end converters, and the other 2 converters serve as receiving-end converters. The converter can realize the conversion of alternating current to direct current or convert direct current to alternating current. The sending-end converter receives alternating current from the AC grid and converts alternating current to direc...

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Abstract

The invention discloses a DC voltage slope control method for multiterminal flexible DC power transmission system and a system. The DC voltage slope control method comprises steps of regulating DC voltage slope through a PI control algorithm according to the error between the DC voltage value and the preset stable voltage reference value, calculating the error amount according to the DC voltage slope, the preset DC voltage control input value, the DC voltage value of a sending terminal converter, the preset DC power control input value and the DC power, calculating at control amount through a PI control algorithm according to the error, and regulating DC power of the sending terminal converter according to the control amount in order to make the DC voltage of the sending terminal converter approximate to a preset stable voltage reference value. Through the fact that the DC voltage slope can perform self-adaption adjustment along the deviation of the DC voltage of the multi-terminal flexible DC power transmission system when the multi-terminal flexible DC power transmission system is disturbed, the invention cannot only regulate the DC power of the current converter to balance the inner power of the DC power transmission system, but also realizes the constant control of the voltage.

Description

technical field [0001] The invention relates to the electrical field, in particular to a DC voltage slope control method and system for a multi-terminal flexible DC transmission system. Background technique [0002] The multi-terminal DC transmission system can realize multi-source power supply, multi-drop power receiving, island power supply, and realize distributed energy and wind power grid integration. The multi-terminal DC grid includes several DC terminals. For the DC transmission system, the DC voltage must be kept within a limited range to ensure the normal operation of the power supply and load, otherwise the entire DC transmission system will collapse. In addition, when a certain converter is out of operation due to a fault, the remaining converters can withstand certain disturbances and then transition to a new stable operating point, so how to control each converter to ensure the stable operation of the DC transmission system and complete power supply Function i...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 魏承志张祥文安赵曼勇李岩傅闯袁智勇黄维芳牟敏金鑫叶睆
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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