Direct-current on-off device based on Si IGBT device and SiC JFET device parallel combination design and control method
A technology of DC interruption and control method, applied in the field of power electronics, can solve the problems of unsatisfactory rapidity, low reliability, difficult to achieve synchronization, etc., to reduce control complexity, meet rapidity requirements, and improve shutdown. The effect of reliability
Inactive Publication Date: 2021-06-29
HUNAN UNIV
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[0006] The present invention provides a DC breaking device and a control method based on the parallel combination design of Si IGBT devices and SiC JFET devices, which solves the problem of arcing in existing DC circuit breakers when cutting short-circuit currents and isolating fault points in DC power distribution systems, and the rapidity Can not meet the requirements, low reliability, complex control, difficult to achieve synchronization during the shutdown process; and the existing DC circuit breaker has a complex structure and large volume
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[0033]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0034] This embodiment is a DC breaking device designed based on the parallel combination of Si IGBT devices and SiC JFET devices, such as figure 1 As shown, it is mainly composed of a sampling module, an optocoupler isolation module, a single-chip microcomputer control module, a drive module, and a main switch module. The sampling module is connected to the main circuit, the optocoupler isolation module is connected to the sampling module, and the single-chip m...
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The invention discloses a direct-current on-off device based on Si IGBT device and SiC JFET device parallel combination design, and a control method. The direct-current on-off device comprises a sampling module, an optical coupler isolation module, a single-chip microcomputer control module, a driving module and a main switch module which are electrically connected in sequence, wherein the sampling module is connected with a main circuit, and the main switch module is connected with the main circuit. The control method comprises the steps that: the single-chip microcomputer control module judges the state of a power distribution system according to a threshold relation set by a main circuit current signal and the single-chip microcomputer control module; and the driving module drives a main switch module device to act according to the circuit state judgment result of the single-chip microcomputer control module. The problem that a plurality of SiC JFET devices cannot be turned off at the same time when being turned off due to the fact that a normally-on SiC JFET device bears overvoltage in the turn-off process is solved.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and relates to a DC breaking device and a control method designed based on the parallel combination of Si IGBT devices and SiC JFET devices. Background technique [0002] Most of the existing distributed renewable power sources mainly output DC power, and at the same time, the terminal load of the distribution network mostly uses DC power supply. Therefore, the medium and low voltage DC power distribution system is expected to become the future development trend. As one of the keys to the medium and low voltage DC power distribution system, fast and reliable DC breaking technology is an important guarantee to ensure the safe and reliable operation of the system. There are three kinds of existing DC circuit breakers: mechanical type, hybrid type and all solid state. [0003] Among them, there is a mechanical switch inside the mechanical DC circuit breaker, which makes the breaking time ...
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IPC IPC(8): H02H7/26H02H3/02
CPCH02H3/02H02H7/268
Inventor 涂春鸣肖标郭祺高家元肖凡龙柳姜飞兰征
Owner HUNAN UNIV