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Short-circuit fault ride-through and recovery method for direct current side of HVDC on basis of mixed type MMC

一种短路故障、恢复方法的技术，应用在交流功率输入变换为直流功率输出、电力传输交流网络、交流网络电压调整等方向，能够解决造价昂贵、高压大容量场合很少应用、技术不成熟等问题

Active Publication Date: 2015-01-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3) Use DC-side equipment (such as DC circuit breakers) to isolate fault points, but DC circuit breakers have disadvantages such as difficulty in extinguishing arcs, difficult dissipation of line energy, high cost, and immature technology, so they are rarely used in high-voltage and large-capacity occasions
[0007] Although the above three fault handling methods can protect the converter station, they cannot provide security for the connected AC system, nor can they provide support for DC fault recovery

Method used

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  • Short-circuit fault ride-through and recovery method for direct current side of HVDC on basis of mixed type MMC
  • Short-circuit fault ride-through and recovery method for direct current side of HVDC on basis of mixed type MMC
  • Short-circuit fault ride-through and recovery method for direct current side of HVDC on basis of mixed type MMC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] A short-circuit fault on the DC side is detected, and the DC voltage becomes 0kV; according to the stability requirements of the connected AC system and DC line, set the reference value of the active power transmitted by the hybrid MMC to 0MW, and the reactive power that needs to be injected into the AC system The reference value is 1MVAR, and the AC voltage reference value e required to be output by each phase of the MMC when the DC side short-circuit fault rides through is obtained iv_ref ; calculate u if_p , u ih_p , u if_n and u ih_n They are:

[0099] u if _ p = - e iv _ ref ( 1 - 1 2 m ) + U dc 1 4 ...

Embodiment 2

[0107] A short-circuit fault on the DC side is detected, and the DC voltage becomes 0kV; according to the stability requirements of the connected AC system and DC line, set the reference value of the active power transmitted by the hybrid MMC to 0MW, and the reactive power that needs to be injected into the AC system The reference value is 1MVAR, and the AC voltage reference value e required to be output by each phase of the MMC when the DC side short-circuit fault rides through is obtained iv_ref ; calculate u if_p , u ih_p , u if_n and u ih_n They are:

[0108] u if _ p = - 1 2 e iv _ ref - 1 4 U dc + 1 2 m U ...

Embodiment 3

[0116] A short-circuit fault on the DC side is detected, and the DC voltage becomes 0kV; according to the stability requirements of the connected AC system and DC line, set the reference value of the active power transmitted by the hybrid MMC to 0MW, and the reactive power that needs to be injected into the AC system The reference value is 1MVAR, and the AC voltage reference value e required to be output by each phase of the MMC when the DC side short-circuit fault rides through is obtained iv_ref ; calculate u if_p , u ih_p , u if_n and u ih_n They are:

[0117] u if _ p = - e iv _ ref ( 1 - x - 1 2 m + xm ) + ...

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Abstract

The invention discloses a short-circuit fault ride-through and recovery method for a direct current side of HVDC on the basis of a mixed type MMC. According to the method, under the premise that a current converter is not blocked, the short-circuit fault ride-through and recovery of the direct current side can be completed through control of the current converter, mechanical equipment does not need to act, the current converter does not need to be restarted in the recovery process, and therefore the fault response and recovery speed is high. The method is especially effective for impermanent short-circuit faults frequently caused when electric transmission lines are overhead lines, the faults on the direct current side are isolated, and reactive and active support can be provided for an alternating current and direct current system, and the transient stability of the connected alternating current and direct current system can be improved.

Description

technical field [0001] The invention belongs to the technical field of multi-level power electronic converters, and more specifically relates to a hybrid MMC-based short-circuit fault ride-through and recovery method on the HVDC DC side. Background technique [0002] Modular Multilevel Converter Based High Voltage Direct Current (MMC-HVDC) system based on Modular Multilevel Converter Based High Voltage Direct Current (MMC-HVDC) has been used in flexible has gained a place in direct current transmission. However, whether it is an offshore MMC-HVDC project using submarine cables or an onshore MMC-HVDC project using overhead lines, DC faults are a serious type of fault that must be considered in their design and operation, especially for overhead lines In the HVDC project, the probability of DC faults is much higher than that in the HVDC project where the transmission line is a cable. [0003] There are currently three methods to deal with DC faults: [0004] 1) Use the AC s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/12
CPCH02J3/12H02J3/36H02M1/32H02M1/325H02M7/4835
Inventor 胡家兵徐克成路茂增郑皖宁
Owner HUAZHONG UNIV OF SCI & TECH
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