Flexible direct current transmission submodule and flexible direct current transmission system
A flexible direct current and electronic transmission technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as unnegligible, uncontrollable conduction interference, device performance degradation, etc., to achieve the effect of ensuring work performance and eliminating conduction interference
Active Publication Date: 2019-10-25
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
However, in practical applications, due to the parasitic capacitance characteristics between devices and circuits such as inductors, resistors, chip pins, and shielding boxes, the equivalent value of parasitic capacitance in many cases (such as high-frequency transmission) is relatively large, so in specific calculations cannot be ignored in
In the flexible DC power transmission system, the parasitic capacitance between the shielding box and the circuit will have a great impact on the driving signal, and then introduce uncontrollable conduction interference, resulting in a decrease in the performance of the device (such as a slow turn-on speed), and the entire circuit signal Oscillation occurs
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[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all belong to the protection scope of the present invention.
[0021] In addition, the terms first, second, etc. in the specification and claims are only used for the descriptive purpose of distinguishing the same technical feature, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features, Sequence or chronological order is not necessarily depicted, either. The terms are interchangeable under appropriate circumstances. Thu...
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The invention discloses a flexible direct current transmission submodule, which comprises a first capacitor, an IGBT power unit and a shielding box, wherein an emitter of the IGBT is connected with the shielding box through a driving lead, and a gate of the IGBT is connected with the shielding box through the first capacitor; and the element capacitance of the first capacitor is configured to compensate the balance difference of a Kelvin bridge formed by the interelectrode capacitance of the IGBT and the parasitic capacitance of the shielding box. The invention further discloses a flexible direct current transmission system which comprises the flexible direct current transmission submodule. According to the flexible direct current transmission submodule and the flexible direct current transmission system disclosed by the invention, the interference caused by parasitic capacitance is eliminated by constructing the balanced Kelvin bridge, so that the driving signal tends to be normal, and the working performance of the whole transmission system is ensured.
Description
technical field [0001] The invention relates to the application field of semiconductor elements, in particular to a flexible direct current transmission sub-module and a flexible direct current transmission system. Background technique [0002] Flexible DC transmission technology is a new generation of DC transmission technology with voltage source converter as the core. It has the advantages of good controllability, flexible operation mode, and flexible adjustment of AC system voltage. It is widely used in various grid power supply systems. In the flexible DC transmission system, the application of high-power semiconductor devices is more and more extensive, and the reliability of the insulated gate bipolar transistor (IGBT) has gradually become one of the key factors to measure the safety and performance of the power system. [0003] Generally speaking, the instantaneous voltage and current generated by the IGBT in the flexible DC transmission system during the turn-on and...
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IPC IPC(8): H02M1/44
CPCH02M1/44
Inventor 项阳黎小林刘磊厉天威李敏李斌唐力
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD