A double-buck full-bridge grid-connected inverter based on frequency multiplication modulation

A double step-down and inverter technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of large filter inductor volume, large current harmonic content, and large leakage current etc. to achieve low total harmonic distortion, reduce DC components, and reduce switching losses

Inactive Publication Date: 2019-12-17
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a double-buck full-bridge grid-connected inverter based on frequency multiplication modulation, which solves the problem of large current harmonic content and leakage current of the existing double-buck grid-connected inverter. The problem of large volume and high cost of large and filter inductors

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  • A double-buck full-bridge grid-connected inverter based on frequency multiplication modulation
  • A double-buck full-bridge grid-connected inverter based on frequency multiplication modulation
  • A double-buck full-bridge grid-connected inverter based on frequency multiplication modulation

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[0027] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0028] Such as figure 1 As shown, a double-buck full-bridge grid-connected inverter based on frequency multiplication modulation, including power switch tube S 5 , power switch tube S 5 The drain and DC voltage U dc connected to the positive pole, S 5 The sources of the power switches S 1 Drain, diode D 2 The negative pole of the power switch tube S 3 drain and diode D 4 The negative pole is connected; the power swit...

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Abstract

The invention discloses a dual buck full-bridge grid-connected inverter based on frequency multiplication modulation, the dual buck full-bridge grid-connected inverter comprises a power switch tube S5, wherein a drain of the power switch tube S5 is connected with a positive electrode of direct current voltage Udc, and a source of the S5 is respectively connected with the drain of a power switch tube S1, a negative electrode of a diode D2, the drain of a power switch tube S3 and the negative electrode of a diode D4. For the inverter provided by the invention, frequency multiplication modulationis used on the aspect of control, under the premise of constant switching frequency, working frequency is improved to double of the original frequency, thus, higher output voltage frequency can be obtained and grid-connected electrical energy quality is improved; isolation between an alternating current side and a direct current side is realized structurally, and direct current component of the grid-connected voltage is reduced; moreover, the switch tube is in a half-cycle working mode, thus, switch loss is reduced, continuing current circuit grid-connected current does not pass through a body diode which has relatively poor performance, so, the dual buck full-bridge grid-connected inverter has the advantages of low grid current total harmonic distortion and high reliability.

Description

technical field [0001] The invention relates to the field of photovoltaic grid-connected inverters, in particular to a double-buck full-bridge grid-connected inverter based on frequency multiplication modulation. Background technique [0002] Although the existing double Buck full-bridge grid-connected inverter has the advantages of high DC voltage utilization rate, no common-mode leakage current, three-level output, and low loss, there are two DC inductors in the circuit, which are large in size and difficult to operate. At this time, only one inductor is always in the working state, resulting in low utilization of magnetic components, high system cost, and low power density; in addition, the decoupling between the DC side and the AC side of the inverter is not realized, which makes the DC component of the grid-connected current The content is higher. If the bipolar frequency multiplication modulation strategy is adopted, the equivalent operating frequency of the grid-conn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387
CPCH02M7/5387
Inventor 代云中李佳李祎杜程茂庄圣贤张荣飞
Owner SOUTHWEST PETROLEUM UNIV
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