Outlet current-limiting reactor value determination method of flexible direct current power distribution system interface device

A flexible DC power distribution and current limiting reactor technology, applied in electrical components, power transmission AC network, emergency protection circuit devices, etc. and other problems to achieve the effect of improving the reliability of power supply

Active Publication Date: 2019-06-07
SOUTH CHINA UNIV OF TECH
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  • Application Information

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Problems solved by technology

Among them, the AC circuit breaker operates for a long time, which will cause the power electronic equipment to withstand a larger and longer fault current; the use of the fault self-clearing capability sub-module will increase the loss and investment of the system during steady-state operation, and will improve the control of the system. Difficulty; and DC circuit b

Method used

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  • Outlet current-limiting reactor value determination method of flexible direct current power distribution system interface device
  • Outlet current-limiting reactor value determination method of flexible direct current power distribution system interface device
  • Outlet current-limiting reactor value determination method of flexible direct current power distribution system interface device

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[0026] Example

[0027] Such as figure 1 As shown, a method for determining the value of the outlet current-limiting reactor of the interface device of a flexible DC power distribution system includes the following steps:

[0028] S1 is based on the topology of ±10kV flexible DC power distribution system, such as figure 2 Shown. The number of inverters in the system N=6, and the VSC outlet capacitance is C VSC =1500μF, current-limiting reactor is L VSC , The bridge arm reactor is L q ; DCSST outlet capacitance is C DCSST =10000μF, current-limiting reactor is L DCSST ; DC cable inductance is L Cable , The resistance is R Cable .

[0029] S2VSC outlet discharge circuit such as image 3 Shown. According to the discharge circuit, the discharge process can be equivalent to a second-order capacitive inductance circuit superimposed on a first-order inductance circuit, and the fault current flowing through the DC circuit breaker can be obtained.

[0030]

[0031] Where: R Cstray(VS...

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Abstract

The present invention discloses an outlet current-limiting reactor value determination method of a flexible direct current power distribution system interface device. Discharge circuits under bipolarshort-circuit faults at different positions at the outlet of the interface device are analyzed through +/-10kV multi-end flexible direct current power distribution system topological structure and theinterface device topological structure, and the opening capacity of a direct current circuit breaker is combined to obtain a current-limiting reactor value to be accessed by the outlet of the interface device in a condition of meeting the open capacity of the direct current circuit breaker. The method scientifically and effectively determines the current-limiting reactor device at the outlet of the interface device so as to improve the system power supply reliability and provide reference for over-voltage and over-current research of the system in future.

Description

technical field [0001] The invention relates to the field of fault analysis of a ±10kV multi-terminal flexible DC power distribution system, in particular to a method for determining the value of an outlet current-limiting reactor of an interface device of a flexible DC power distribution system. Background technique [0002] With the development of distributed energy technology, energy storage technology, sensitive electronic loads, and large data centers, the flexible DC power distribution system based on modular multilevel converters is an important development trend of future urban distribution networks. When a bipolar short-circuit fault occurs in the system, the fault current rises rapidly due to capacitor discharge, which will cause a huge impact on the equipment, which will affect the safe and reliable operation of the system. [0003] In order to prevent the equipment from being impacted by the fault current, it is necessary to isolate the fault in time. The current...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J3/36
CPCY02E60/60
Inventor 韩永霞高毓群张竞涵肖芳磊郭芳赵宇明
Owner SOUTH CHINA UNIV OF TECH
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