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Direct-current solid-state circuit breaker

A solid-state circuit breaker and DC bus technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of judging the fault state of faulty circuits, unable to detect stable current and voltage signals, etc.

Active Publication Date: 2020-05-29
中国船舶集团有限公司第七一一研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the controller cannot detect stable current and voltage signals at the end of the DC circuit breaker connected to the fault circuit, and thus cannot judge whether the fault state of the fault circuit has improved through the current and voltage signals of the fault circuit.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0046] Figures 1 to 2 A preferred embodiment according to the invention is shown. The DC solid-state circuit breaker of this embodiment is used to connect the energy source and the DC bus of the DC power grid, and to control the on-off of the circuit between the energy source and the DC bus. The energy source of this embodiment is the battery pack 130 . The DC solid state circuit breaker includes an energy source terminal 170 for connecting to an energy source, and a DC bus terminal 180 for connecting to a DC bus. The positive pole of the energy source terminal 170 is used to connect with the positive pole of the energy source. The negative pole of the energy source terminal 170 is used to connect with the negative pole of the energy source. The positive pole of the DC bus terminal 180 is used to connect with the positive pole of the DC bus. The negative pole of the DC bus terminal 180 is used to connect with the negative pole of the DC bus. This achieves electrical isol...

Embodiment approach 2

[0070] image 3 Another preferred embodiment according to the invention is shown. The switching circuit 210 , the freewheeling circuit 220 , the filter capacitor 260 and the energy source terminal 270 in the second embodiment are the same as the switching circuit 110 , the freewheeling circuit 120 , the filter capacitor 160 and the energy source terminal 170 in the first embodiment. The difference between Embodiment 2 and Embodiment 1 is that the energy source is a generator set 230 . The low-voltage side of the buck-boost circuit 240 is connected to the generator set 230 through a filter inductor 250 and a filter (not shown in the figure). The emitter of the IGBT2 of each bidirectional Buck-Boost circuit is only connected to the negative pole of the DC bus terminal 280 , but not connected to the generator set 230 . Moreover, the controller 290 controls the buck-boost circuit 240 to perform rectification, so as to convert the alternating current generated by the generator se...

Embodiment approach 3

[0072] The invention also provides an implementation manner of a direct current power grid. The DC power grid in this embodiment includes a DC bus-tie solid-state circuit breaker and the aforementioned DC solid-state circuit breaker. The positive and negative poles of the DC bus terminal of the DC solid state circuit breaker correspond to the positive and negative poles of the DC bus connected to the DC grid. The DC bus-tie solid-state circuit breaker is similar to the DC solid-state circuit breaker with quick cut-off function in the prior art, and will not be repeated here.

[0073] Such as Figure 5 The DC grid shown provides electrical energy to the ship's DC electric propulsion system. Specifically, in the DC power grid, the energy source 1 is connected to the left busbar of the distribution network 1 through the DC solid state circuit breaker 1, and the energy source 2 is connected to the right busbar of the distribution network 1 through the DC solid state circuit brea...

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Abstract

The invention provides a direct-current solid-state circuit breaker. The direct-current solid-state circuit breaker comprises a switching circuit, a freewheeling inductor and a freewheeling capacitor;the switching circuit comprises an IGBT, two first switching diodes and two second switching diodes; one end of the freewheeling inductor is connected with the first end of the switching circuit; theother end of the freewheeling inductor is connected to the anode of the direct-current bus end of the direct-current solid-state circuit breaker; one end of the freewheeling capacitor is connected tothe anode of the direct-current bus end; the other end of the freewheeling capacitor is connected to the cathode of the direct-current bus end and the cathode of an energy source end. Therefore, a freewheeling circuit can maintain an approximately stable current value at the direct-current bus end, and realizes the constant current control of the direct-current bus end; and the controller can monitor the state of a direct-current circuit where the direct-current bus is located according to the current and / or voltage of the direct-current bus end, determine whether the direct-current circuit where the direct-current bus is located is in a fault state all the time, and determine whether to control an IGBT to be in an off state all the time so as to achieve a selective protection function.

Description

technical field [0001] The present invention relates generally to the field of DC power grids, and more particularly to a DC solid-state circuit breaker. Background technique [0002] In the prior art, the ship's electric propulsion system is powered by an internal combustion engine-driven generator set for the ship's electric propulsion system. However, the marine environment is complex and changeable, and the load of the electric propeller used to drive the ship is constantly changing. When the load of the electric propulsion (propeller) changes, the speed of the internal combustion engine cannot adapt to the change of load at this time, and the internal combustion engine deviates from the optimal load point, the fuel in the internal combustion engine cannot be fully burned, and the combustion efficiency of the fuel is greatly reduced. Dropped significantly. And the incomplete combustion of fuel will produce a large amount of nitrogen oxides and sulfur oxides. This not ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 冯玉龙杨璇王春杰李骁朱一航段征
Owner 中国船舶集团有限公司第七一一研究所
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