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Series converter based on Si IGBT/SiC MOS hybrid parallel devices, and fault operation control method thereof

A technology of series converters and devices, which is applied in the direction of output power conversion devices, electrical components, and high-efficiency power electronic conversion, and can solve the problem that series converters cannot simultaneously meet low turn-on loss, low switching loss, low cost, high overload and short circuit Capability, increased system maintenance costs, low reliability of converters, etc.

Inactive Publication Date: 2021-04-23
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The failure of a power device in the series converter based on SiC MOSFET will cause the shutdown of the entire converter, the reliability of the converter is low, the fault tolerance rate of the system is greatly reduced, and the later maintenance cost of the system is increased.
[0004] In summary, there are major problems at present: the series converters in the prior art cannot meet the application requirements of low turn-on loss, low switching loss, low cost, high overload and short-circuit capability, and high frequency at the same time, and the existing series converters The converter does not have fault operation capability, and the failure of a certain power device in the converter will cause the entire converter to stop running, reducing the reliability of the system, increasing maintenance costs and causing a certain degree of economic loss

Method used

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  • Series converter based on Si IGBT/SiC MOS hybrid parallel devices, and fault operation control method thereof
  • Series converter based on Si IGBT/SiC MOS hybrid parallel devices, and fault operation control method thereof
  • Series converter based on Si IGBT/SiC MOS hybrid parallel devices, and fault operation control method thereof

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Embodiment Construction

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0039] Such as figure 1 As shown, the present invention proposes a series converter based on a Si IGBT / SiC MOS hybrid parallel device. The series converter is a half-bridge structure, including three output terminals of DC positive, DC negative and AC, and the upper and lower bridge arms are symmetrical. Both the upper bridge arm and the lower bridge arm are composed of n+r hybrid parallel devices in series, of which n devices maintain the normal operation of the series converter, and r devices are used for redundancy. Each hybrid parallel device in the series converter consists of a A SiC MOS and b IGBTs are connected in parallel, that is, the drain of each SiC MOS in the hybrid parallel device is connected to the collector of each IGBT, the source of each SiC MOS is connected to the...

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Abstract

The invention discloses a series converter based on Si IGBT / SiC MOS hybrid parallel devices, and a fault operation control method thereof. The converter is of a half-bridge structure, an upper bridge arm and a lower bridge arm are each formed by connecting (n + r) hybrid parallel devices in series, n devices maintain normal operation, r devices are used as redundancy, each hybrid parallel device is formed by connecting a SiC MOSs and b IGBTs in parallel, each IGBT / SiC MOS comprises a driver, and the converter comprises a total central controller and is responsible for driving sequence, state monitoring and control strategy adjustment of devices. If a certain power device in the converter fails, the fault operation control strategy can judge the failure position in a switching period, uploads the operation condition of the converter, and adopts the control strategy to maintain normal operation. The converter provided by the invention considers the advantages of high voltage, high power, high frequency and high power density, and the provided fault control strategy can ensure that the converter continues to operate normally under the condition of device faults, so that the fault tolerance of the system is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a series converter based on a Si IGBT / SiC MOS hybrid parallel device and a fault operation control method thereof, belonging to the technical field of high-voltage high-power converters. Background technique [0002] At present, power electronic technology is widely used in many fields such as motor drive, flexible DC and uninterruptible power supply. Industrial applications have higher and higher demands for high voltage and high power of power electronic converters. Due to the constraints of on-resistance, device structure and production process, the voltage level of a single power device cannot meet the application requirements. Therefore, in some applications, the device is connected in series. Increase the voltage level of power electronic converters to meet application requirements. At the same time, in order to reduce the volume and weight of the converter, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
CPCH02M1/32Y02B70/10
Inventor 谢瑞林斌陈晴徐晗王霄鹤李景一傅春翔施朝晖徐鸥洋
Owner POWERCHINA HUADONG ENG COPORATION LTD
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