Cascaded multilevel single-phase inverter and cascaded multilevel three-phase inverter adopting novel three-terminal switching networks
A switching network and multi-level technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve the problems of inductance loss and large output harmonics
Active Publication Date: 2015-02-04
SOUTH CHINA UNIV OF TECH
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However, the inductance losses and output harmonics are still large
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[0029] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but it is not intended to determine the key or important part of the present invention, nor is it intended to limit the scope of the present invention. With reference to the following description of the embodiments of the present invention in conjunction with the accompanying drawings, it will be easier to understand the above and other purposes, features and advantages of the present invention. of.
[0030] see Figure 1A , a cascaded multi-level single-phase half-bridge inverter using a new three-terminal switch network, including: two input power supplies (V1, V2), four input filter capacitors (C1, C2, C3, C4) , four power switches (S1, S2, S3, S4) and their body diodes (D1, D2, D3, D4), two anti-phase coupled two-winding transformers (T1, T2), two filter inductors (L1 , L2) and an output filter capacitor C5, four power diodes (D5, ...
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A cascaded multilevel single-phase half-bridge inverter adopting novel three-terminal switching networks disclosed by the invention comprises four power switch tubes and body diodes thereof, four input filter capacitors, two reversely-coupled two-winding transformers, two output filter inductors, a filter capacitor, and four power diodes. The cascaded multilevel single-phase half-bridge inverter can be extended into single-phase full-bridge inverter and three-phase bridge inverter circuits of two structures. The four power switch tubes, the four power diodes and the two reversely-coupled two-winding transformers constitute cascading of two three-terminal switching networks. Compared with a general two-level or traditional multilevel inverter topology, no dead zone needs to be set between the power switch tubes of upper and lower bridge arms of each three-terminal switching network, the power switch tubes can be switched on to work simultaneously, and multi-level output is realized at an inverter neutral point. Therefore, the output voltage harmonic is improved, the size and volume of the output filter inductors are reduced, and the loss of switching devices is reduced. The system material cost is reduced, and the system performance of the inverter is improved.
Description
technical field [0001] The invention relates to a multi-level inverter, specifically a cascaded multi-level single-phase inverter and a three-phase inverter using a novel three-terminal switch network. Background technique [0002] Inverters convert direct current to alternating current. Inverters are an important part of uninterruptible power supplies (UPS) and new energy power generation systems such as wind energy, solar photovoltaic, and fuel cells. Conversion efficiency and output harmonics are the most important electrical indicators of the inverter. High conversion efficiency can reduce power loss, and low harmonics can improve power quality. [0003] The loss of power devices and output filter inductors in the inverter limits the improvement of inverter efficiency. At the same time, fierce market competition, rising prices of raw materials such as power switch tubes and steel and copper have brought great cost pressure to inverter manufacturers. At present, due to...
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Login to View More IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 胡炎申谢运祥
Owner SOUTH CHINA UNIV OF TECH