One-phase five-level inverter

A five-level, inverter technology, applied in the direction of adjusting electrical variables, single-network parallel feeding arrangements, instruments, etc., can solve the problems of non-isolated photovoltaic grid-connected systems, poor high-frequency common-mode current suppression Problems such as large and high-frequency common-mode current can reduce the risk of bridge arm shoot-through, reduce the frequency of bridge arm commutation, and achieve the effects of wide operating voltage range

CN103326606AActive Publication Date: 2013-09-25HOYMILES POWER ELECTRONICS INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-09-25

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Abstract

The invention discloses a one-phase five-level inverter. The one-phase five-level inverter comprises a common ground type three-level switching circuit, a filter circuit and a power frequency inversion circuit. For being realized specifically, the inverter comprises six power switches from S1 to S6, two diodes from D1 to D2, and a one-phase output filter F. The output of the inverter is five levels, and the inverter has the advantages of being high in inversion efficiency and reliability and simple in control mode. Meanwhile, through the voltage clamp mode, the inverter can eliminate high-frequency common mode current danger in a non-isolated type grid-connected inverter system effectively. Thus, the inverter is especially suitable for being applied to a non-isolated type photovoltaic grid-connected system.
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Description

technical field

[0001] The invention belongs to the technical field of power electronics, and in particular relates to a single-phase five-level inverter. Background technique

[0002] With the intensification of the global energy crisis and environmental problems, vigorously developing renewable clean energy has become the focus of energy development in countries all over the world. Photovoltaic power generation has shown good development prospects due to its rich resources and wide distribution. However, photovoltaic power generation has problems such as high power generation cost and low energy density. Therefore, how to reduce costs and improve energy conversion efficiency has become a challenging engineering topic for photovoltaic power generation systems.

[0003] In the photovoltaic grid-connected system, the photovoltaic grid-connected inverter is responsible for converting the DC power generated by the photovoltaic cell array into AC power, and then delivering it t...

Examples

Embodiment Construction

[0027] In order to describe the present invention more specifically, the technical solutions and related working principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as image 3 As shown, a single-phase five-level inverter includes: a common ground type three-level conversion circuit, a filter circuit and a power frequency inverter circuit; the input source is a photovoltaic battery; where:

[0029]The common-ground three-level conversion circuit is used to convert the DC voltage generated by the photovoltaic cell into a three-level DC voltage; in this embodiment, it includes an input capacitor C1, two MOS transistors S1-S2, flying capacitor C2 and Diodes D1-D2; wherein, the anode of the input capacitor C1 is connected to the drain of the MOS transistor S1 and the anode of the photovoltaic cell, the source of the MOS transistor S1 is connected to the anode of the flying capac...