Seven-level circuit, grid-connected inverter and modulation method and device for grid-connected inverter

A modulation method and seven-level technology, applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve the problem that transformerless inverters cannot realize DC input source and AC load electrical Isolation, inability to balance leakage current and high efficiency at the same time

Active Publication Date: 2012-10-03
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0004] However, since the transformerless inverter cannot realize the electrical isolation between the DC input source and the AC load, the leakage current problem is one of the key indicators of its reliabili

Method used

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  • Seven-level circuit, grid-connected inverter and modulation method and device for grid-connected inverter
  • Seven-level circuit, grid-connected inverter and modulation method and device for grid-connected inverter
  • Seven-level circuit, grid-connected inverter and modulation method and device for grid-connected inverter

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Embodiment Construction

[0090] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0091] see figure 1 , which is the circuit diagram of the first embodiment of the application of the seven-level circuit of the present invention to the grid-connected inverter.

[0092] A seven-level circuit includes a DC boost circuit and a symmetrical double Buck circuit connected in parallel with a DC power supply.

[0093] The DC boost circuit includes: a fourth capacitor CB1 and a DC chopper connected in parallel with the DC power supply; the common end of the second switching tube T2 and the second diode D2 is connected to the DC chopper and the fourth capacitor CB1 The eighth switch tube TB2 is connected between the common terminals of the two.

[0094]The symmetrical double Buck circuit includes: the first capacitor C1 and t...

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Abstract

The invention provides a seven-level circuit. The seven-level circuit comprises a direct current boosted circuit and a symmetrical double Buck circuit, wherein the direct current boosted circuit comprises: a fourth capacitor and a direct current chopper are connected with a direct current power supply in parallel, and an eighth switch tube is connected between the common terminal of a second switch tube and a second diode and the common terminal of the direct current chopper and a fourth capacitor; the symmetrical double Buck circuit comprises: a first capacitor and a second capacitor are connected in series and then are connected with the two sides of the direct current power supply in parallel, a first diode and a second diode are connected in series and then are connected with the direct current power supply in parallel, a first switch tube is arranged between the first capacitor and the first diode, and a second switch tube is arranged between the second diode and the second capacitor; a first inductor is arranged between the first diode and the output end of the seven-level circuit; a second inductor is arranged between the common terminal of the second switch tube and the second diode and the output end of the seven-level circuit; and the common point of the first capacitor and the second capacitor is connected with the common point of the first diode and the second diode. The invention provides the seven-level circuit, a grid-connected inverter and a modulation method and a modulation device for the grid-connected inverter, which takes leakage current and high efficiency into consideration.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a seven-level circuit, a grid-connected inverter and a modulation method and device thereof. Background technique [0002] The classification of inverters is generally divided into off-grid inverters and grid-connected inverters according to the different application occasions and control methods of the inverters. It can be divided into transformer-isolated inverters and transformerless inverters. [0003] Due to the advantages of simple system structure, high efficiency, small size and low cost, the transformerless inverter has been developed rapidly. [0004] However, since the transformerless inverter cannot realize the electrical isolation between the DC input source and the AC load, the leakage current problem is one of the key indicators of its reliability. [0005] In order to obtain higher efficiency, a unipolar modulation strategy is often used, and the tradi...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M1/088
Inventor 汪洪亮赵为
Owner SUNGROW POWER SUPPLY CO LTD
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