Multi-port hybrid DC circuit breaker with adaptive reclosing and control method

A hybrid DC, control method technology, applied in the direction of automatic disconnection emergency protection device, circuit device, emergency protection circuit device, etc., can solve the problems of no adaptive reclosing function, long energy consumption time of arrester, high manufacturing cost, etc. , to achieve the effect of reducing configuration costs, shortening power supply recovery time, and avoiding hazards

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

AI Technical Summary

Problems solved by technology

[0005] The inventors found that the existing hybrid DC circuit breakers have the following problems: (1) high manufacturing cost; (2) the arrester takes a long time to consume energy and dissipates a large amount of energy; (3) there is no adaptive reclosing function

Method used

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  • Multi-port hybrid DC circuit breaker with adaptive reclosing and control method
  • Multi-port hybrid DC circuit breaker with adaptive reclosing and control method
  • Multi-port hybrid DC circuit breaker with adaptive reclosing and control method

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Experimental program
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Effect test

Embodiment 1

[0051] Such as figure 1 As shown, Embodiment 1 of the present disclosure provides a multiport hybrid DC circuit breaker (MPHCB) with an adaptive reclosing function, including: n ports and a load transfer switch on each port (load commutation switch, LCS), fast mechanical switch (ultra-fast disconnector, UFD) and residual current switch (residual current breaker, RCB); n diode branches D 1 -D n ; a one-way main breaker (main breaker, MB), which is composed of a large number of power electronic modules based on full-control devices and lightning arresters connected in parallel; a bypass switch (bypass switch, BS) and its parallel current-limiting resistor R c (The value is 2.5kΩ in the application scenario of 500kV voltage level); a diode D g with the dissipation resistor R g (The value is 10Ω in the application scenario of 500kV voltage level) series branch.

[0052] Compared with the configuration scheme of two-port HCB, the circuit breaker in this embodiment retains the f...

Embodiment 2

[0115] Embodiment 2 of the present disclosure provides a computer-readable storage medium, on which a program is stored. When the program is executed by a processor, the multi-port hybrid DC circuit breaker with adaptive reclosing described in Embodiment 1 of the present disclosure is implemented. A step in the control method, the steps are:

[0116] assuming t 0 A short-circuit fault occurs at the first port of the port at any time, and the fault current of each port starts to rise;

[0117] at t 1 At any time, the multi-port hybrid DC circuit breaker receives the trip command from the line protection, starts to isolate the faulty port, closes the main breaker, locks the first load transfer switch, and commutates the fault current to the main breaker;

[0118] at t 2 After the current of the first mechanical switch drops to zero, the first mechanical switch starts to open;

[0119] at t 3 At this moment, the opening of the first mechanical switch is completed, and the ma...

Embodiment 3

[0125] Embodiment 3 of the present disclosure provides an electronic device, including a memory, a processor, and a program stored in the memory and operable on the processor. When the processor executes the program, the implementation as described in Embodiment 1 of the present disclosure is achieved. The steps in the multi-port hybrid DC circuit breaker control method with adaptive reclosing, the steps are:

[0126] assuming t 0 A short-circuit fault occurs at the first port of the port at any time, and the fault current of each port starts to rise;

[0127] at t 1 At any time, the multi-port hybrid DC circuit breaker receives the trip command from the line protection, starts to isolate the faulty port, closes the main breaker, locks the first load transfer switch, and commutates the fault current to the main breaker;

[0128] at t 2After the current of the first mechanical switch drops to zero, the first mechanical switch starts to open;

[0129] at t 3 At this moment,...

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Abstract

The present disclosure provides a multi-port hybrid DC circuit breaker with self-adaptive reclosing and a control method thereof, including multiple ports, and each port sequentially passes through a load transfer switch, a mechanical switch, a residual current switch and a one-way main break switch. Connected at one end; the second end of the main break switch is connected to the first end of the energy dissipation resistor through a current limiting resistor, the current limiting resistor is connected in parallel with a bypass switch, and the second end of the energy dissipation resistor is connected to the negative end of the first diode connection, the positive terminal of the first diode is grounded; the connection between the load transfer switch and the mechanical switch corresponding to each port is connected to the first end of the energy dissipation resistor through the second diode; The energy consumption time and energy consumption pressure of the arrester have the function of adaptive reclosing, which can greatly reduce the impact of transient faults on overhead lines, greatly shorten the power supply recovery time after a transient fault occurs in the DC power grid, and avoid permanent faults in the event of a fault. The hazards that may be caused by reclosing the DC circuit breaker in the event of a permanent fault.

Description

technical field [0001] The present disclosure relates to the technical field of DC side fault isolation and restoration of a flexible DC power grid, in particular to a multi-port hybrid DC circuit breaker with adaptive reclosing and a control method. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Compared with the AC system and the traditional DC transmission system based on grid commutation, the flexible DC grid based on modular multilevel converter has decoupling control of active and reactive power, no commutation failure problem, and can be passive With advantages such as network power supply, it is an ideal way for large-scale renewable energy to be connected to the grid. However, due to the low-impedance characteristics of the flexible DC grid, when a fault occurs on the DC side, the fault current can reach several times or even ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/06
CPCH02H7/268H02H3/066
Inventor 邹贵彬张烁魏秀燕高厚磊张成泉
Owner SHANDONG UNIV
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