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DC side fault protection system and method based on MMC submodule topology

A technology of fault protection and sub-modules, which is applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, power transmission AC networks, etc., and can solve the problems of reduced system safety and stability, accidental conduction of thyristors, and long fault isolation time, etc. problem, to achieve the effect of suppressing high forward voltage change rate, accelerating current decay, and preventing false conduction

Active Publication Date: 2018-02-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] In view of the above problems, the present invention provides a DC side fault protection system and method based on MMC sub-module topology to solve the problem of accidental conduction of thyristors, diode damage, and fault isolation caused by the double thyristor method when clearing the DC side faults of the MMC-HVDC system A long period of time leads to the problem of reduced system security and stability

Method used

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  • DC side fault protection system and method based on MMC submodule topology
  • DC side fault protection system and method based on MMC submodule topology
  • DC side fault protection system and method based on MMC submodule topology

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Embodiment 1

[0064] In order to verify the effectiveness of the DC side fault protection system and method based on the MMC sub-module topology, this embodiment builds an MMC-HVDC system simulation model on the RTDS platform for simulation verification, using such as Figure 5 The simulation model of the MMC-HVDC system shown is to simulate the forward voltage change rate of the thyristor S2 respectively. The fault location is 0km, 50km, and 150km away from the converter station outlet. The instantaneous fault simulation is performed, and the fault location is 0km, 50km, and 150km away from the converter station outlet. Permanent fault simulation.

[0065] (1) When the system is running normally, the simulation results of the voltage change rate borne by the thyristor S2 in the sub-module topology are as follows Figure 6 As shown, the simulation results of the high forward voltage change rate caused by switching the sub-module capacitance are as follows Figure 7 shown, compared Figure...

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Abstract

The invention belongs to the technical field of DC side relay protection of an MMC-HVDC system, and especially relates to a DC side fault protection system and method based on the MMC submodule topology. The system comprises an MMC-HVDC system current converter, a data read-in module, a logic judgment module and a protection action module, wherein the MMC-HVDC system current converter, the data read-in module, the logic judgment module and the protection action module are connected sequentially. The MMC-HVDC system current converter consists of MMC submodules and an additional resistor module,and the additional resistor module is formed by the parallel connection of an antiparallel IGBT and an additional resistor, and is connected to a DC side circuit in a series manner. Each MMC submodule is additionally provided with resistance-capacitance absorbing devices between a plurality of series thyristors, and is additionally provided with a group of antiparallel IGBTs and a diode. The method comprises the steps: data collection, low-voltage overcurrent protection logic judgment and fault current attenuation judgment. The method effectively solves the problems that a double-thyristor method causes the accidental conduction of the thyristors and the damages to the diodes during the removing of a DC side fault of an MMC-HVDC system and the long fault isolation time causes the reduction of the safety and stability of the system.

Description

technical field [0001] The invention belongs to the technical field of relay protection on the DC side of an MMC-HVDC system, and in particular relates to a DC side fault protection system and method based on MMC sub-module topology. Background technique [0002] The MMC topology based on the half-bridge sub-module is difficult to quickly deal with the severe impact from the DC side fault, which will cause serious impact on the AC and DC side systems. Therefore, properly handling DC line faults is a key issue that needs to be resolved urgently in engineering and academia. [0003] At present, relevant researches are being carried out on converter topologies with DC fault isolation capability. , put the submodule capacitor into the fault path with reverse polarity, thereby eliminating the fault current. The second type is mainly represented by the double thyristor method. After the DC line fails, in order to avoid the uncontrollable rectification bridge, the bridge arm path...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/087H02H7/125H02J3/36
CPCH02H3/087H02H7/125H02J3/36Y02E60/60
Inventor 马静项晓强康文博李沛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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