A method for overcurrent detection and breaking control of a solid state circuit breaker
A solid-state circuit breaker, overcurrent detection technology, applied in emergency protection circuit devices, measurement using digital measurement technology, electrical components, etc. Break control, enhance the price advantage, the effect of low cost
Active Publication Date: 2021-09-24
FORETECH ELEC APP JIANGSU CORP
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Problems solved by technology
This method has simple structure, high precision, and low cost, but it has obvious disadvantages such as large power consumption caused by series resistance and small applicable current.
Indirect methods such as figure 2 As shown, the current signal in the circuit is detected by Hall and other current sensors, which overcomes the shortcomings of the direct method, but the high-speed current sensor is expensive, and its reliability is reduced in an environment with high interference noise, which weakens the relative power of solid-state circuit breakers. Advantages over mechanical circuit breakers
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[0028] The technical solution of the present invention will be further introduced below in combination with specific implementation methods and accompanying drawings. image 3 It is a schematic diagram of the method of the present invention, including a conduction voltage detection circuit of a semiconductor device, a voltage fitting module, a digital-to-analog conversion module, a voltage comparison module, a logic synthesis module, a driving circuit, and the like. A certain type of semiconductor device is taken as an example below to describe the specific implementation manner of the present invention.
[0029] The volt-ampere characteristic curve of this type of IGBT is as follows Figure 4 shown. In order to realize fault current detection, it is only necessary to judge the conduction current i of the semiconductor device CE Is it greater than the set threshold i th . Depend on Figure 4 It can be seen that the conduction current i of the semiconductor CE and turn-on...
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The invention discloses a fault current detection and breaking control method suitable for a solid-state circuit breaker, which belongs to the field of power distribution and utilization in power systems. The method mainly includes a semiconductor device current detection module, an overcurrent threshold setting and output module, an overcurrent signal comparison and logic synthesis module, and the like. The present invention utilizes the inherent volt-ampere characteristics of semiconductor devices to realize current detection by detecting the turn-on voltage of the device, and obtains an overcurrent threshold signal through polynomial fitting calculation, without adding additional sampling resistors in the circuit, and does not increase additional losses; There is also no need for a high-cost current sensor, and it is easy to realize fast fault detection and disconnection control.
Description
technical field [0001] The invention relates to the field of power distribution and power utilization, in particular to a fault current detection and breaking control technology of a solid-state circuit breaker. Background technique [0002] With the large-scale access of new energy sources such as photovoltaics and the improvement of users' requirements for power supply quality and reliability, the shortcomings and disadvantages of the AC distribution network make it difficult to meet the needs of modern and future distribution networks. DC distribution network has the advantages of low line loss, good power supply quality and long distance, and has become the development direction of distribution network widely concerned by academia and industry. However, the key problem faced by the DC power distribution technology is the elimination of faults. Unlike AC current, DC current does not have a natural zero-crossing point, and the current rises very fast when a short-circuit ...
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IPC IPC(8): H02H7/26G01R19/25
CPCG01R19/25H02H7/263H02H7/268
Inventor 雷家兴丁高峰林鹤云余鹏飞孙开原虞国荣
Owner FORETECH ELEC APP JIANGSU CORP