Single-phase nine-level power converter based on coupling inductors
A technology of power converters and coupled inductors, applied in the field of multi-level power electronic power converters, can solve the problems of a large number of storage capacitors, complex topological structures, and unbalanced voltages, and achieve simple structure, flexible configuration, and low harmonic content Effect
Inactive Publication Date: 2013-01-16
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
When the number of output levels of the converter is relatively large, the diode-clamped topology will require a large number of clamping diodes, and the capacitor voltage balance on the DC side must be considered, which limits its application due to reliability and complexity.
For the flying capacitor multilevel converter, its advantage is that it has more output level combinations, so that the voltage of the capacitor can be balanced by optimizing the modulation strategy; the disadvantage is that when the number of levels of the converter increases, a large number of The storage capacitor, the topology is more complex
Since the cascaded H-bridge multilevel converter uses the H-bridge as the basic power unit, it has the advantages of modular layout and packaging, and there is no problem of unbalanced DC side voltage; however, an additional independent DC power supply is required
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[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0020] The first bridge arm, the second bridge arm, and the third bridge arm are composed of power electronic power devices, that is, the first to tenth fully controlled power electronic switching devices S 1 -S 10 and the first to fourteenth diodes D 1 -D 14 constitute. S below 1 -S 10 Take the case of IGBT as an example to illustrate the connection mode between each device:
[0021] Such as figure 1 As shown, the first bridge arm is controlled by the first switch S 1 , the second switch S 2 , the first diode D 1 and the second diode D 2 constitute. first switch S 1 The emitter of the second switch S 2 The collectors are connected to form the output terminal a of the first bridge arm. first diode D 1 positive pole of the first switch S 1 The emitter is connected to the first diode D 1 The negative pole of the first switch S 1...
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The invention provides a single-phase nine-level power converter based on coupling inductors, which is formed by two bridge arms with a diode clamping three-level structure, a single bridge arm with a two-level structure, two voltage-sharing capacitors and two coupling inductors. An output end of the single bridge arm with the two-level structure is used as one terminal of an output end of the single-phase nine-level power converter based on the coupling inductors. Output ends of the bridge arms with the diode clamping three-level structure are respectively connected with two non-public connection points of the two coupling inductors; and a public connection point of the two coupling inductors is used as the other terminal of the output end of the single-phase nine-level power converter based on the coupling inductors. The two coupling inductors are connected in sequence. The single-phase nine-level power converter can be used as a power converter including a single-phase inverter, a rectifier and the like; a three-phase nine-level power converter can be formed by the three converters to be applied to a three-phase field; and a power converter with more level quantity is formed by cascading connection disclosed by the invention under the condition needing high voltage.
Description
technical field [0001] The invention relates to a multi-level power electronic power converter, in particular to a single-phase nine-level voltage type power converter. Background technique [0002] In order to improve the voltage tolerance level, reduce the harmonic content of the output voltage, and reduce the electromagnetic interference caused by high dv / dt, multi-level power electronic power converters have always received extensive attention And research has also produced a large number of practical application devices. Relevant research institutions and R&D enterprises and units at home and abroad have also proposed multi-level power converters with various topological structures. [0003] Multilevel power electronic power converters mainly have three types of topologies: diode clamp, flying capacitor, and cascaded H-bridge. When the number of output levels of the converter is relatively large, the diode-clamped topology will require a large number of clamping diode...
Claims
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IPC IPC(8): H02M7/483
Inventor 赵鲁李子欣李耀华葛琼璇任晋旗马逊
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI