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Four-terminal high-voltage direct current power transmission system

A power transmission system, high-voltage direct current technology, applied in the direction of power transmission AC network, etc., can solve problems such as complex control methods of multi-terminal direct current transmission systems, and achieve the effects of preventing failures, simple control methods, and preventing switch failures

Inactive Publication Date: 2017-05-31
六安市科宇专利技术开发服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing multi-terminal direct current transmission system control method is relatively complicated

Method used

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  • Four-terminal high-voltage direct current power transmission system
  • Four-terminal high-voltage direct current power transmission system

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Embodiment Construction

[0013] figure 1 The block diagram of the four-terminal HVDC transmission system: figure 1 The medium and high voltage direct current transmission system mainly includes: AC input power 101 , AC input power 102 , converter station 103 , converter station 104 , capacitor 105 , capacitor 106 , converter station 107 , and converter station 108 . The AC input power 101 and the AC input power are distributed power generation, thermal power or nuclear power, the converter stations 103 and 104 are rectifier converters, and the converter stations 107 and 108 are inverter converters. The AC input power source 101 inputs AC power to the converter station 103, and the converter station 103 outputs DC power to the converter station 107 through the DC bus bar, and outputs AC power after being inverted by the converter station 107, and the AC input power source 102 inputs AC power to the converter station 104, The converter station 104 outputs DC power to the converter station 108 through t...

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Abstract

The invention discloses a four-terminal high-voltage direct current power transmission system which comprises an alternating current input power supply 101, an alternating current input power supply 102, a converter station 103, a converter station 104, a capacitor 105, a capacitor 106, a converter station 107, a converter station 108, a monitoring system and an initial phase angle analysis system. Adjustment on active power and reactive power output by the system is realized by adjusting an initial phase angle of alternating current output by partial converter stations in a high-voltage direct current converter station, the system power control complexity is reduced, and adjusted system operation parameters can be effectively guaranteed to be in safe threshold ranges respectively, so that system faults caused by too high or too low power output by the system can be prevented, the temperature of a power transmission line is prevented from exceeding a safe operation allowable value, and line faults can not be caused.

Description

technical field [0001] The invention relates to a four-terminal high-voltage direct current transmission system, in particular to power control of a multi-terminal high-voltage direct current transmission system. Background technique [0002] Multi-terminal direct current transmission system (MTDC) refers to a direct current transmission system containing multiple rectification stations or multiple inverter stations. way of power transmission. MTDC power transmission system is mainly used in: to transmit electric energy from multiple energy bases to multiple load centers in the distance. As well as the improvement of power quality requirements, the hybrid MTDC power transmission technology based on conventional current source converters and voltage source converters, the MDTC power transmission technology based on FACTS, and the new MTDC technology based on VSC will be developed rapidly and will definitely improve The operational reliability and practicability of the MTDC ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 王杰义
Owner 六安市科宇专利技术开发服务有限公司