Control method of switched inductor Z-source midpoint clamping type three-level inverter
A three-level inverter, switching inductor technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve the problem of infinite output voltage gain, reduce voltage utilization, system Stability reduction and other problems, to achieve the effect of low output common mode voltage, reduced switching loss, and high operating efficiency
Active Publication Date: 2021-07-13
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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Problems solved by technology
The above single Z-source inverter improves the boost factor to a certain extent and reduces the system cost, but its boost capability cannot meet the needs of high-power application systems
Under ideal conditions, the single z-source NPC inverter and the DC / DC boost converter can also obtain infinite voltage gain, but due to the limited voltage withstand capability of the inverter switch, and the direct duty ratio D and the modulation degree M are mutually Relevant, if the modulation degree is increased, the switch stress is reduced at this time, and the voltage utilization rate is reduced at the same time, so that the system stability is reduced, so the output voltage gain cannot be infinite in practical applications
Method used
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Embodiment 1
[0061] Embodiment 1: Switched inductor Z source NPC type three-level inverter
[0062] Switched inductor Z-source NPC inverter topology
[0063] Such as figure 2 The circuit topology shown is a switched inductor Z-source NPC inverter. This topology aims to improve the boost ratio. In the traditional Z-source NPC circuit structure, two inductors and four diodes are introduced to form two upper and lower switched inductor networks. When the circuit switches, the energy of the capacitor is stored and transmitted, and the inductor is periodically switched between parallel charging and series discharging, which makes this topology have a higher boost factor and is suitable for high-power application systems.
[0064] Working Principle of Switched Inductor Z Source NPC Inverter
[0065] The working principle of the switched inductor Z-source NPC inverter is similar to that of the traditional Z-source inverter, and it is divided into direct and non-straight-through operating state...
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Abstract
The invention discloses a control method of a switched inductor Z-source midpoint clamping type three-level inverter. The switched inductor Z-source midpoint clamping type three-level inverter comprises a Z-source network circuit and an NPC three-level inverter, wherein the Z-source network circuit and the NPC three-level inverter are cascaded. The Z-source network circuit and the NPC three-level inverter are respectively a pre-stage circuit and a post-stage circuit; the NPC three-level inverter is provided with three bridge arms which are connected in parallel, and each bridge arm is provided with four power switches which are connected in series; and the Z-source inverter is different from a traditional direct-current inverter in that two inductors L1 and L2 and a plurality of diodes are added; the performance of the inverter is improved by adding the direct connection; and according to the control method of the switched inductor Z-source midpoint clamping type three-level inverter, the waveform distortion of the output voltage of the inverter can be remarkably reduced, and the output voltage can be improved.
Description
technical field [0001] The invention relates to a control method for a switch inductance Z source midpoint clamping type three-level inverter. Background technique [0002] The three-level inverter is an inverter topology developed in recent years that can realize high-voltage and high-power electric energy conversion. Compared with the two-level inverter, it has the advantages of lower output harmonic content, reduced power switching loss, and small switching stress under the same frequency condition. In a variety of different multi-level inverter topologies, such as cascaded inverters, midpoint-mounted inverters, capacitor-mounted inverters, etc., midpoint-mounted inverters are widely used. However, due to the constraints of its own topology, this inverter cannot output a higher voltage than its own DC source. Therefore, in applications such as fuel cells and photovoltaic systems, it is necessary to add a pre-stage inverter circuit to increase the output voltage. In orde...
Claims
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Login to View More IPC IPC(8): H02M7/487
CPCH02M7/487
Inventor 朱俊杰李勇郑志安宁重阳
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY