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Topological structure of LCC-VSC type hybrid DC transmission system and starting method of LCC-VSC type hybrid DC transmission system

An LCC-VSC, hybrid DC technology, applied in the field of power engineering, can solve the problem that LCC-VSC hybrid DC transmission system cannot be directly used, and achieve the effect of perfect and clear control strategy and smooth and stable start-up process

Inactive Publication Date: 2015-02-18
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing conventional HVDC system start-up methods and flexible HVDC start-up methods cannot be directly applied to the LCC-VSC hybrid HVDC system.
How to start the LCC-VSC hybrid DC transmission system smoothly has not been studied in the literature at home and abroad

Method used

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  • Topological structure of LCC-VSC type hybrid DC transmission system and starting method of LCC-VSC type hybrid DC transmission system
  • Topological structure of LCC-VSC type hybrid DC transmission system and starting method of LCC-VSC type hybrid DC transmission system
  • Topological structure of LCC-VSC type hybrid DC transmission system and starting method of LCC-VSC type hybrid DC transmission system

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Embodiment approach

[0023] figure 1 It is the topology diagram of the entire LCC-VSC hybrid DC transmission start-up system. In the figure, AC system 1 at both ends, AC circuit breaker 2, AC filter 3, converter transformer 4, LCC converter 5, smoothing reactor 6, DC line equivalent resistance 7, DC line equivalent reactance 8, DC side voltage stabilizing capacitor 9, VSC converter 10, VSC side connected transformer and phase reactor equivalent resistance 11, VSC side connected transformer and phase reactor Equivalent inductance 12.

[0024] Among them, the active power flow flows from the LCC converter 5 to the VSC converter 10, and the two ends are connected to the AC system through the AC circuit breaker. The AC filter 3 is installed on the AC side of the LCC converter 5 and the VSC converter 10, and the DC side is stable. The piezocapacitor 9 and the smoothing reactor 6 are respectively connected in parallel and in series on the DC line,

[0025] The rectifier station side uses two six-pulse...

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Abstract

The invention relates to a starting method of an LCC-VSC type hybrid DC transmission system. The method specifically comprises the steps that an LCC current converter is unlocked to conduct fixed DC current control, a DC side capacitor is charged, inertial element filtering is added for a current measuring value, current instruction values gradually rise to a rated value from zero, when the DC voltage rises to the rated value, a VSC current converter is unlocked to conduct fixed DC voltage control, power is gradually transmitted to a VSC side from an LCC side, and the starting process is completed. The starting method enables the LCC-VSC type hybrid DC transmission system to smoothly transit to be in a normal operation state from a dead halt state, the entire starting process is smooth and stable, meanwhile, the control strategy of the hybrid DC transmission system is complete and clear, and the system can accurately track target reference values to stably operate after starting is completed.

Description

[0001] technical field [0002] The invention belongs to the technical field of electric power engineering. It specifically relates to a LCC-VSC hybrid DC transmission system topology and start-up method (hybrid HVDC transmission technology Hybrid based on thyristor-based current source converter LCC and fully-controlled power electronic device voltage source converter VSC) HVDC). Background technique [0003] The LCC-VSC hybrid DC transmission technology uses a grid commutated converter LCC (line commutated converter) on the rectification side, and a voltage source converter (VSC) on the inverter side. The VSC current on the inverter side can be self-shutoff, does not require an external commutation voltage, does not rely on the AC system to maintain voltage and frequency stability, and can supply power to weak AC systems or passive networks. The LCC-VSC hybrid DC power transmission system meets the requirements of long-distance and large-capacity west-to-east power trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60H02J3/36
Inventor 余瑜
Owner HUBEI UNIV OF TECH