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Three-level inverter of single-phase mixed bridge

A three-level inverter, hybrid bridge technology, applied in electrical components, photovoltaic power generation, conversion of AC power input to DC power output, etc., can solve problems such as reducing system efficiency and reliability, increasing system complexity and cost, etc. , to achieve the effect of low cost, good output waveform quality and simple system

Active Publication Date: 2009-12-09
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN1375902 discloses a leakage current suppression method for an inverter, which requires an additional level of DC-DC converter and related detection and control circuits, which increases the complexity and cost of the system and reduces the system efficiency and reliability

Method used

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  • Three-level inverter of single-phase mixed bridge
  • Three-level inverter of single-phase mixed bridge
  • Three-level inverter of single-phase mixed bridge

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Embodiment Construction

[0014] figure 1 The single-phase hybrid bridge three-level inverter provided by the present invention includes six switching tubes T 1 ~T 6 , four diodes D 1 ~D 4 , two electrolytic capacitors C 1 and C 2 , an inductor L f and an AC filter capacitor C f , where T 1 ~T 4 , C 1 , C 2 ,D 1 ,D 2 Constitutes a three-level single-phase conversion unit clamped by a diode midpoint, T 5 ,T 6 , C 1 and C 2 Constitute a single-phase half-bridge conversion unit, D 3 with D 4 The series branch of D with 1 and D 2 The series branches are connected in parallel, D 3 with D 4 midpoint and T 5 and T 6 The midpoints of the bridge arms are connected. The output of the inverter bridge arm passes through L f and C f The formed LC filter is connected to the power grid. The input of the single-phase hybrid bridge three-level inverter is V b The battery pack is composed of multiple lead-acid batteries connected in series, and the rated voltage of the battery pack must be hi...

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Abstract

The invention discloses a three-level inverter of a single-phase mixed bridge, comprising six switching tubes T1 to T6, four diodes D1 to D4, two electrolytic capacitors C1 to C2 and one output filter; wherein the four switching tubes T1 to T4, the two electrolytic capacitors C1 to C2 and the diodes D1 and D2 form a three-level single-phase converter unit of a diode middle point clamping position, the switching tubes T5 and T6, and the two electrolytic capacitors C1 to C2 form a single-phase half-bridge converter unit, a serial-connection branch circuit of D3 and D4 is connected with a serial-connection branch circuit of D1 and D2 in parallel, and the middle point of the D3 and D4 is connected with the middle point of the bridge arm of T5 and T6. The three-level inverter can effectively inhibit ground leakage current of the inverter, and has the advantages of high efficiency and simple modulating method, and the three-level inverter is suitable for a power supply inverter system which has strict ground leakage current, such as no-transformer type photovoltaic grid-connection inverter and the like.

Description

technical field [0001] The invention relates to the technical field of DC-AC inverter, in particular to a single-phase three-level inverter. Background technique [0002] As countries around the world pay more attention to the development and application of new energy, power generation technologies based on new energy such as photovoltaics have been extensively researched and applied. In the grid-connected photovoltaic power generation system, the DC power generated by the photovoltaic array is generally converted into AC power by the grid-connected inverter to supply the load or merge into the grid. A large number of grid-connected inverters on the market have power frequency transformers on the output side to realize functions such as electrical isolation and voltage matching. However, the existence of power frequency transformers greatly increases the size and weight of grid-connected inverters, which is not suitable for It is applied in small and medium power occasions;...

Claims

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Application Information

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IPC IPC(8): H02M7/537
CPCY02E10/56H02M7/487
Inventor 段善旭刘邦银康勇
Owner HUAZHONG UNIV OF SCI & TECH
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