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Novel dual-buck grid-connected inverter capable of eliminating common-mode leakage current

A leakage current, double step-down technology, applied in the field of new double step-down grid-connected inverters, can solve the problems of high price, increase inverter cost, reduce power density, etc., achieve high power density, improve reliability, The effect of reducing switching losses

Inactive Publication Date: 2017-11-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0033] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a new type of dual step-down grid-connected inverter that can eliminate the common-mode leakage current, and to solve the leakage current requirement of the traditional DFGI, which needs to add expensive large-volume filter capacitors The problem of increasing the cost of the inverter and reducing the power density

Method used

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  • Novel dual-buck grid-connected inverter capable of eliminating common-mode leakage current
  • Novel dual-buck grid-connected inverter capable of eliminating common-mode leakage current
  • Novel dual-buck grid-connected inverter capable of eliminating common-mode leakage current

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Embodiment Construction

[0071] Further describe the technical scheme of the present invention in detail below in conjunction with accompanying drawing:

[0072] It can be seen from the background technology that the root cause of the common-mode leakage current in the traditional DFGI is that the effective common-mode voltages of the positive half-cycle mode I and mode II are different, and the high frequency changes with the transition between mode I and mode II. To solve this problem, this embodiment does not have a filter capacitor C f In the case of DFGI, a switch tube S is connected in series at the positive end of the DC power supply of the traditional DFGI 5 ,Such as Figure 5 shown.

[0073] New dual-buck grid-connected inverter that eliminates common-mode leakage current, including freewheeling diode D 1 、D 2 、D 3 、D 4 , switch tube S 1 , S 2 , S 3 , S 4 , S 5 , filter inductance L 1 , L 2 , L g , where L g is the grid side filter inductance;

[0074] Photovoltaic DC input vo...

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Abstract

The invention discloses a novel dual-buck grid-connected inverter capable of eliminating common-mode leakage current. The positive end of the photovoltaic direct current input voltage uin is connected with S5, the other end of S5 is connected with D1, D2, S3, and S4, the positive end of D1 is connected with S1 and L1, the positive end of D2 is connected with S2 and L2, one end of S3 is connected with the positive end of D3, the negative end of D3 is connected with L1 and one end of Lg, the other end of Lg is connected with one end of the power grid voltage ug, S4 is connected with the positive end of D4, the other end of ug, the other end of L2, and the negative end of D4 are grounded, and S1 and S2 are connected with the negative end of uin. Compared with the convention dual-buck grid-connected inverter with a filtering capacitor, the novel dual-buck grid-connected inverter has low leakage current without the filtering capacitor.

Description

technical field [0001] The invention relates to the field of photovoltaic grid-connected inverters, in particular to a novel double-buck grid-connected inverter capable of eliminating common-mode leakage current. Background technique [0002] Grid-connected Inverter (GCI), as the core power conversion device of photovoltaic power generation equipment, requires GCI to have high power quality and reliability [1-3] . The traditional bridge GCI needs to set a dead time for the switching tubes of the same bridge arm to avoid bridge arm shoot-through, but the introduction of the dead time will increase the harmonics of the grid-connected current and reduce its power quality [4-5] . Non-isolated photovoltaic grid-connected inverter (NPGCI) has the advantages of small size, low cost and high efficiency. [6-8] . However, since there is no isolation transformer between the NPGCI photovoltaic DC side and the AC side, and there is a parasitic capacitance between the DC side and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/12
CPCH02M1/12H02M7/5387H02M1/0054H02M1/123Y02B70/10Y02E10/56
Inventor 代云中赵万明官子超张荣飞蒋林钟新梅谷雪琴施星瑞曾蕊周春华
Owner SOUTHWEST PETROLEUM UNIV