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Hybrid DC transmission fault handling system and method based on current limiter and circuit breaker

A technology of hybrid DC power transmission and processing methods, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, usage of superconductor elements, electrical components, etc., can solve the problem of increasing the on-state loss of DC circuit breakers and cutting off fault currents Long time, high technical requirements for voltage equalization and current equalization, etc., to achieve the effect of shortening the duration, reducing dissipated energy, and suppressing the rise of DC short-circuit current

Active Publication Date: 2022-04-15
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical DC circuit breaker has strong load capacity, stable operation, small on-state loss, and large breaking capacity, but it takes a long time to cut off the fault current, and the equipment is easily burned by the arc when it is cut off; the solid-state DC circuit breaker cuts off quickly. However, a large number of power electronic switches need to be connected in series, which requires high voltage and current sharing technology, and the use of a large number of power electronic switches increases the on-state loss of the DC circuit breaker under normal conduction; HDCB combines mechanical switches with solid-state switches, It retains the advantages of small on-state loss, strong load capacity and fast response speed of solid-state switches of mechanical switches, and realizes fast and safe breaking of DC current

Method used

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  • Hybrid DC transmission fault handling system and method based on current limiter and circuit breaker
  • Hybrid DC transmission fault handling system and method based on current limiter and circuit breaker
  • Hybrid DC transmission fault handling system and method based on current limiter and circuit breaker

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example 1

[0070] Example 1: The fault start time is t 0 = 3s, the fault location is set at the midpoint of the DC transmission line, the fault resistance (also called transition resistance) is set to 1Ω, and the fault duration is 250ms. The resistance R of the resistive superconducting current limiter on the inverter side SC-VSC Set to 0Ω (no SFCL), 20Ω, 30Ω, 40Ω, 50Ω, and the resistance R of the resistive superconducting current limiter on the rectification side SC-LCC remain unchanged at 50Ω. The fault current response obtained at the LCC converter station and the VSC converter station is shown in Figure 9(a) and Figure 9(b), and the transient voltage of the hybrid DC circuit breaker at the side of the LCC converter station and the VSC converter station The responses are shown in Figure 10(a) and Figure 10(b). The response data of VSC converter station side is shown in attached table 2.

[0071] Attached Table 2 VSC converter station side fault response data when changing the SFCL...

example 2

[0073] Example 2: The fault start time is t 0 = 3s, the fault location is set at the midpoint of the DC transmission line, the fault resistance (also called transition resistance) is set to 1Ω, and the fault duration is 250ms. The resistance R of the resistive superconducting current limiter on the inverter side SC-VSC Set to 30Ω, the resistance R of the rectification side resistive superconducting current limiter SC-LCC Set to 50Ω, the delay time T of the main circuit breaker d The settings are 3ms, 4ms, 5ms, 6ms, 7ms. The fault current responses obtained at the LCC converter station and VSC converter station are shown in Figure 11(a) and Figure 11(b), and the transient voltage of the hybrid DC circuit breaker at the LCC converter station and VSC The responses are shown in Figure 12(a) and Figure 12(b). The response data at the VSC converter station side is shown in Attached Table 3.

[0074] Attached Table 3 VSC Converter Station Side Fault Response Data When Changing t...

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Abstract

The present invention relates to power system and automation technology, in particular to a hybrid DC transmission fault processing system and method based on a current limiter and a circuit breaker. The system is equipped with a set of resistive superconducting fault current limiters at the entrance and exit of the transmission line. Equipment and hybrid DC circuit breaker equipment, design a controllable delay to coordinate the action time interval of the resistive superconducting fault current limiter and the hybrid DC circuit breaker, so as to realize the cooperation between the two and effectively deal with the hybrid DC transmission system DC fault in . The method of this system is effective and applicable in dealing with DC faults, especially for voltage source converter type converter stations, which can effectively suppress the rise of DC fault current, reduce the duration of transient voltage, and significantly reduce the hybrid open circuit The converter dissipates energy, and this method can be used as an effective backup method for the commutation type converter station of the grid to ensure timely fault isolation. The robustness of the whole hybrid direct current transmission system is effectively improved.

Description

technical field [0001] The invention belongs to the field of electric power system and automation technology, and in particular relates to a hybrid DC transmission fault processing system and method based on a current limiter and a circuit breaker. Background technique [0002] Traditional HVDC (High Voltage Direct Current, HVDC) technologies include Grid Commutated (Line Commutated Converter, LCC) HVDC technology and Voltage Source Converter (Voltage Source Converter, VSC) HVDC technology. In recent years, hybrid DC transmission technology is a new type of realization scheme to achieve the goal of long-distance large-capacity transmission, and has attracted more and more attention from domestic and foreign scholars. Hybrid DC transmission technology combines the advantages of LCC-HVDC and VSC-HVDC. Using LCC converter stations as rectifier stations can effectively reduce costs; using VSC converter stations as inverter stations can enhance operational flexibility. In additi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02H02H7/26H02J3/36
CPCH02H9/023H02H7/268H02J3/36Y02E40/60Y02E60/60
Inventor 陈磊李国城丁蒙陈红坤田昕
Owner WUHAN UNIV
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