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Eight-switch-tube transformerless type photovoltaic grid-connected inversion circuit and control method

A technology of inverter circuit and switch tube, applied in the field of power electronic photovoltaic grid-connected power generation, can solve problems such as large leakage current, achieve the effects of improving efficiency, suppressing leakage current to ground, and eliminating reverse recovery loss

Active Publication Date: 2018-08-17
DONGGUAN MAUTEN ELECTRONICS TECH CO LTD
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  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of large ground leakage current in single-phase non-isolated photovoltaic grid-connected inverters, the present invention proposes a high-efficiency, low-leakage current non-isolated eight-switch tube transformerless photovoltaic grid-connected inverter circuit

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  • Eight-switch-tube transformerless type photovoltaic grid-connected inversion circuit and control method
  • Eight-switch-tube transformerless type photovoltaic grid-connected inversion circuit and control method
  • Eight-switch-tube transformerless type photovoltaic grid-connected inversion circuit and control method

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments of the present invention.

[0028] like figure 1 As shown, a schematic diagram of the topological structure of an eight-switch tube transformerless photovoltaic grid-connected inverter circuit provided by the present invention includes: a first voltage dividing capacitor C dc1 , the second voltage dividing capacitor C dc2 , the first freewheeling diode D 1 , the second freewheeling diode D 2 , the first switching tube S 1 , the second switch tube S 2 , the third switch tube S 3 , the fourth switch tube S 4 , the fifth switch tube S 5 , the sixth switch tube S 6 , the seventh switch tube S 7 , the eighth switch tube S 8 and the first filter inductor L 1 , the second filter inductance L 2 .

[0029] The first switch tube S 1 The collector of the DC source is respectively connected to the positive pole of the DC source and the first voltage divi...

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Abstract

The invention discloses an eight-switch-tube transformerless type photovoltaic grid-connected inversion circuit and a control method and belongs to the power electronics field. An inverter controls the motions of eight switch tubes in the inversion circuit through a given switch tube driving signal and forms a zero-level follow current loop through the motions of the switch tubes and diodes D1 andD2 in a follow current phase. The voltage of the follow current loop can be half of an input voltage in the follow current phase. The common mode voltage of the inverter always maintains Udc / 2. The high frequency pulsation of the common mode voltage can be eliminated and an earth leakage current is effectively restrained. Through constructing the new follow current loop, a follow current path ischanged so that the follow current path does not pass through a body diode with a large conduction loss and the conduction loss is reduced. Simultaneously, compared with other midpoint clamping modes,in a topology, there is no switch tube which is always in a high frequency work state, switch losses are reduced and efficiency is increased. The method possesses advantages that a topology structureis simple; the efficiency is high; and a modulation strategy is simple and so on.

Description

technical field [0001] The invention belongs to the technical field of power electronic photovoltaic grid-connected power generation, and specifically relates to an eight-switch tube transformerless photovoltaic grid-connected inverter circuit and a control method. Background technique [0002] With the depletion of traditional energy sources, it is imminent to seek new energy sources. Solar energy has become the first choice for new energy workers due to its endless and safe and reliable features. The single-phase non-isolated photovoltaic grid-connected inverter has the advantages of small size, light weight, low cost, simple structure and improved system efficiency because the transformer is removed, and it has become one of the mainstreams of research on photovoltaic grid-connected power generation systems. [0003] However, due to the removal of the transformer, the parasitic capacitance of the inverter to the ground and various filter inductors and filter capacitors i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/537H02M1/12H02J3/38
CPCH02J3/383H02M1/12H02M7/537H02M1/0051H02M1/0054H02M1/123Y02B70/10Y02E10/56
Inventor 廖志凌曹晨晨邱殿成徐长波
Owner DONGGUAN MAUTEN ELECTRONICS TECH CO LTD
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