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A fast fault recovery method for flexible DC distribution network with built-in energy storage converter

A distribution network failure and rapid recovery technology, applied in the field of power systems, can solve problems such as DC bus voltage fluctuations, inrush currents, bridge arm secondary overcurrent, etc., and achieve the goals of improving reliability, shortening time, and reducing voltage fluctuations Effect

Active Publication Date: 2021-09-24
JIANGSU ELECTRIC POWER CO +2
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  • Claims
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Problems solved by technology

However, during the MMC locking period, the capacitor voltage of each bridge arm sub-module is generally not the rated value during normal operation, direct unlocking will generate inrush current, the bridge arm has the risk of secondary overcurrent, and will cause DC bus voltage fluctuations after unlocking , which seriously affects the power quality of the distribution network, which is not conducive to the recovery of voltage sags and short-term power interruptions, especially for sensitive loads such as data centers, which have high requirements for power quality and power supply reliability

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  • A fast fault recovery method for flexible DC distribution network with built-in energy storage converter
  • A fast fault recovery method for flexible DC distribution network with built-in energy storage converter
  • A fast fault recovery method for flexible DC distribution network with built-in energy storage converter

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Embodiment Construction

[0051] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present invention will be clearly, completely and further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] Such as Figure 1-5 As shown, the flexible DC distribution network fault recovery method proposed by the present invention includes the following steps:

[0053] 1) Configure energy storage built-in converters (ie ESBC) at both ends of the flexible DC distribution network;

[0054] 2) Detect whether a bipolar short-circuit fault occurs on the DC side;

[0055] 3) If a fault occurs, block the energy storage built-in converter;

[0056] 4) Using the energy storage built-in converter to perform fault recovery.

[0057] In a preferred embodiment, detecting whether a bipolar short-circuit fault occurs on the DC side in step 2) includes comparing parameters before and...

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Abstract

A fast fault recovery method for flexible DC distribution network with built-in energy storage converter. It relates to a power system, and in particular to a method for rapid fault recovery of a flexible DC distribution network with built-in energy storage converter. It provides a way to achieve rapid fault recovery through coordination between the converter and energy storage in a separate excitation mode, aiming at the rapid recovery of the distribution network under bipolar short circuit faults, and the storage system that provides uninterrupted power supply during fault clearance. A fast fault recovery method for flexible DC distribution network with built-in converter. On the one hand, the invention provides power to important loads to ensure uninterrupted power supply during the fault clearance period; on the other hand, the sub-module capacitance voltage during the locking period is adjusted so that it reaches the rated value during normal operation before unlocking, reducing the The small voltage fluctuation when the converter is re-unlocked shortens the time for the converter to restart. Such a system coordinated control strategy can further ensure that the reliability of the entire distribution network system is improved.

Description

technical field [0001] The invention relates to a power system, in particular to a method for quickly recovering from faults in a flexible DC power distribution network with an energy storage built-in converter. Background technique [0002] With the gradual deepening of the industrial application of power electronics and the large-scale application of various distributed energy sources such as photovoltaics and wind energy, compared with the traditional AC distribution network, the DC distribution network has the advantages of high power supply reliability, low line loss, and harmonious It has the advantages of low wave content, narrow required transmission corridor, low line cost, and convenient access to new energy power and energy storage. It has broad application prospects in the fields of realizing distributed energy grid connection, urban distribution network, and offshore platform power supply. It has attracted extensive attention and research from experts and schola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/28
CPCH02J3/28H02J3/36Y02E60/60
Inventor 刘忠王冰冰詹昕许扬李培培梅军陈武范光耀
Owner JIANGSU ELECTRIC POWER CO
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