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Bidirectional combined type direct current breaker and control method thereof

A technology of a DC circuit breaker and a control method, which is applied to circuit devices, emergency protection circuit devices, and automatic disconnection emergency protection devices, etc., can solve the problems of circuit breaker breaking failure, exceeding the turn-off capacity of semiconductor devices, and large short-circuit current. , to achieve the effect of improved work performance, sufficient media recovery time, and reliable media recovery

Active Publication Date: 2016-01-27
中国船舶重工集团公司第七一二研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the current transfer time is too long due to unreasonable circuit design, the short-circuit current transferred to the semiconductor device is very large, which may exceed the shutdown capability of the semiconductor device, resulting in the breaking failure of the circuit breaker

Method used

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  • Bidirectional combined type direct current breaker and control method thereof
  • Bidirectional combined type direct current breaker and control method thereof
  • Bidirectional combined type direct current breaker and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] see Figure 5 As shown, it is an equivalent circuit when the bidirectional hybrid DC circuit breaker disclosed in the present invention works in the first working mode and the system current flows from the system terminal J1 to the system terminal J2. The breaking process is as follows:

[0053] refer to Image 6 shown in t t 0 In the stage, the mechanical switch S is in the closed state, and the load current flows through the mechanical switch S. t = t 0 At the moment, the system has a short-circuit fault, and the mechanical switch S current i S With short circuit current i 0 increase began to rise;

[0054] exist t = t 1 At the moment, the mechanical switch S is turned off, and the thyristor T1 is turned on at the same time. Under the action of the arc voltage, the current is forced to transfer from the mechanical switch S to the thyristor T1. i S reduce, i T1 Increase;

[0055] exist t = t 2 At the moment, the current is completely transferred to...

Embodiment 2

[0069] see Figure 7 As shown, it is an equivalent circuit when the bidirectional hybrid DC circuit breaker disclosed in the present invention operates in the second working mode and the system current flows from the system terminal J1 to the system terminal J2.

[0070] refer to Figure 8 shown, the breaking process is in t = t 3 Before the moment, it is exactly the same as the first working mode in Embodiment 1;

[0071] exist t =t 3At the moment, the mechanical switch S contacts reach a sufficient distance, the bridge arms T4-T5 in the thyristor bridge and the thyristor T2 are turned on at the same time, and the capacitor C discharges the inductance L to generate a large pulse current, forcing the current in the thyristor T1 to gradually flow to the L-C circuit. transfer, result i T1 reduce, i C Increase;

[0072] Since the thyristor T1 is always in the conducting state, the voltage across the thyristor T2 is a reverse voltage. Although T2 has a conducting signal...

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Abstract

The present invention discloses a bidirectional combined type direct current breaker and a control method thereof. The bidirectional combined type direct current breaker comprises a principal current circuit, a no-voltage circuit, a null-current circuit and an energy absorption circuit, wherein the principal current circuit, the no-voltage circuit, the null-current circuit and the energy absorption circuit are in parallel. The principal current circuit employs a mechanical switch; the no-voltage circuit employs a bi-directional semiconductor switch formed through anti-parallel thyristors; the null-current circuit is a bi-directional pulse current circuit formed by a precharge capacitor, an inductor and a thyristor bridge; and the energy absorption circuit employs a metal-oxide varistor. The present invention further discloses a control method of the bidirectional combined type direct current breaker. According to the invention, the no-voltage circuit employs thyristors so that the on-state voltage drop is small and the current commutation speed is fast, and a mechanical switch has sufficient dielectric recovery time and post arc dielectric recovery is reliable; a null-current circuit is adopted to realize quick shutdown of the thyristors, and the breaking capacity of a breaker is great; and two working modes are convenient to be realized, and the working capability of the breaker is easy to be improved. The bidirectional combined type direct current breaker and the control method thereof are applicable to the fault protection of a bi-directional direct current power system, with small loss of long-term flow passage, rapid breaking motion, high work reliability and the like.

Description

technical field [0001] The invention belongs to the technical field of power system fault protection, and in particular relates to a bidirectional hybrid DC circuit breaker and a control method thereof. Background technique [0002] Due to its remarkable advantages, DC power systems have been widely used in ships, mines, rail transit and new energy power generation in recent years. With the continuous development of DC power systems and the increasingly stringent power quality requirements of users, traditional mechanical circuit breakers are difficult to meet the special needs of modern large-capacity DC power grid protection, and there is an urgent need for new protection equipment that can quickly and reliably break DC circuits. [0003] DC solid state circuit breakers implemented with pure semiconductor switches, such as figure 1 As shown, the use of fully-controlled semiconductor devices to achieve long-term current flow and fault current breaking of the system has the...

Claims

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Application Information

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IPC IPC(8): H02H3/087
Inventor 彭振东杨晨光任志刚姜楠朱红桥
Owner 中国船舶重工集团公司第七一二研究所
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