Power assembly of three-level converter, and three-level converter
A technology for power components and converters, applied in the field of converters, can solve the problems of uneven distribution of IGBT device losses, increase the difficulty of radiator design, etc., and achieve the effect of uniform distribution of IGBT device losses
Active Publication Date: 2020-11-27
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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Problems solved by technology
[0003] However, in the existing NPC three-level converter, the losses borne by different IGBT devices are different, resulting in the uneven distribution of the losses of the IGBT devices of the NPC three-level converter, which increases the difficulty of heat sink design
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[0029] The characteristics and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only configured to explain the present invention, not to limit the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.
[0030] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation...
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The invention discloses a power assembly of a three-level converter, and the three-level converter. The power assembly of the three-level converter comprises a first NPC bridge arm unit, a second NPCbridge arm unit and a third NPC bridge arm unit, wherein the first NPC bridge arm unit comprises a plurality of NPC bridge arms which are connected in parallel; the second NPC bridge arm unit comprises a plurality of second NPC bridge arms which are connected in parallel; the third NPC bridge arm unit comprises a plurality of third NPC bridge arms which are connected in parallel; and the number ofthe second NPC bridge arms is the same as that of the first NPC bridge arms, and the number of the third NPC bridge arms is determined according to the loss ratio of the first NPC bridge arms to thethird NPC bridge arms. According to the embodiment of the invention, the loss of each NPC bridge arm unit of the three-level converter can be balanced, so that the IGBT device loss of the three-levelconverter is uniformly distributed.
Description
technical field [0001] The invention belongs to the technical field of converters, in particular to a power component of a three-level converter and the three-level converter. Background technique [0002] The wind power converter can realize the AC-DC-AC conversion between the wind turbine and the grid, and is one of the important core components of the wind turbine. The neutral point clamped (Neutral Point Clamped, NPC) three-level converter is a kind of wind power converter, which can use the low blocking voltage insulated gate bipolar transistor (Insulate Gate Bipolar Transistor, IGBT) device to realize DC The increase of the bus voltage can further increase the AC output voltage and expand the power level of the system, so it has been widely used. [0003] However, in the existing NPC three-level converter, the losses borne by different IGBT devices are different, resulting in uneven distribution of losses among the IGBT devices of the NPC three-level converter, which ...
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Login to View More IPC IPC(8): H02M7/487
CPCH02M7/487H02M1/0054Y02B70/10Y02E10/76H02M7/003H02M1/088H02J2300/28H02M7/5387
Inventor 符松格袁小峰
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD