MMC flexible DC power grid adaptive fault clearing scheme based on source-network cooperation

一种柔性直流、故障清除的技术，应用在电气元件、电路装置、紧急保护电路装置等方向，能够解决成本昂贵、选择性不利影响、协调控制难度大等问题，达到降低闭锁的风险、提高速度、增强故障穿越能力的效果

Active Publication Date: 2021-06-01
TIANJIN UNIV
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Problems solved by technology

[0005] The source-side scheme takes advantage of the strong controllability of the converter station, but the method of controlling the fault current through the converter station during the fault clearing process will block the power transmission of the near-end converter station of the fault line, which will adversely affect the selectivity; the grid side In the scheme, it is absolutely selective to use DC circuit breakers to clear faults, but it is still difficult to develop high-speed and large-breaking capacity DC circuit breakers, which are expensive and difficult to coordinate and control

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  • MMC flexible DC power grid adaptive fault clearing scheme based on source-network cooperation
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  • MMC flexible DC power grid adaptive fault clearing scheme based on source-network cooperation

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Embodiment Construction

[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0041] The MMC flexible DC power grid self-adaptive fault clearing scheme based on source-network coordination of the present invention reduces the number of sub-modules invested by MMC through the control strategy during the DC fault period, reduces the DC voltage at the converter outlet, and is consistent with the grid-side pre-charging capacitor voltage Adaptive cooperation, to achieve the purpose of shutting off the fault current and clearing the fault.

[0042] figure 1 It is the topology diagram of the ±500kV four-terminal MMC DC grid system. Among them, grid-side circuit breakers are installed on each DC line, such as figure 2 shown. figure 2 The grid-side circuit breaker...

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Abstract

The invention discloses an MMC flexible DC power grid adaptive fault clearing scheme based on source-network cooperation. A network-side circuit breaker topological structure is installed at each of the two ends of each DC line of an MMC flexible DC power grid, and the network-side circuit breaker topological structure cooperates with a source-side control strategy when a fault occurs in the DC line so as to jointly isolate the fault; and when the system operates stably, a voltage regulation controller does not act, and after a fault occurs, the voltage regulation controller is started, and an output voltage regulation coefficient value is reduced so that the outlet voltage of a converter is correspondingly reduced and is matched with the voltage of a pre-charging capacitor of a topological structure of a network-side circuit breaker, and source-network matched fault isolation is realized. According to the invention, a fault isolation speed is greatly improved.

Description

technical field [0001] The invention relates to the technical field of protection and control of flexible DC power grids, in particular to an adaptive fault clearing scheme for MMC flexible DC power grids based on source-network coordination. Background technique [0002] As a new generation of power transmission technology, voltage source converter based high voltage direct current transmission (VSC-HVDC) has the advantages of independent control of active power and reactive power, no DC filter and no commutation failure, etc., and can be used for grid interconnection Large-scale transmission of renewable energy is one of the important directions for future power grid development and reform. The emergence of modular multilevel converters (MMC) has made flexible DC transmission continue to develop in the direction of high voltage and large capacity. MMC has become the preferred converter topology for flexible DC transmission systems, and has achieved worldwide Wide range of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/268Y02E60/60H02H3/025H02H3/066H02H3/0935H02H7/26
Inventor 陈晓龙韩小文李永丽李斌李博通
Owner TIANJIN UNIV
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