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Dual-output single-phase three-switch-group MMC inverter without direct current bias and control method thereof

A technology with no DC bias and three switch groups, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve problems such as increasing engineering costs, solve voltage equalization problems, reduce The effect of project cost and quality improvement

Active Publication Date: 2014-04-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when two AC lines with different frequencies are connected, two MMC converters are required, which greatly increases the engineering cost

Method used

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  • Dual-output single-phase three-switch-group MMC inverter without direct current bias and control method thereof
  • Dual-output single-phase three-switch-group MMC inverter without direct current bias and control method thereof
  • Dual-output single-phase three-switch-group MMC inverter without direct current bias and control method thereof

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Embodiment Construction

[0019] In order to further illustrate the content and characteristics of the present invention, the specific implementation of the present invention will be described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto.

[0020] refer to figure 1 , the dual-output single-phase three-switch group MMC inverter without DC bias of the present invention includes a DC power supply U dc , the first capacitance C 1 , the second capacitance C 2 , the third capacitor C 3 , a switch bridge arm, a first load and a second load; the switch bridge arm consists of an upper switch group H, a middle switch group M, a lower switch group L and a coupled inductance (L H :L L ) in series; the upper switch group H consists of N power switch units (SM H1 , SM H2 ,...,SM HN ) in series, and the middle switch group M consists of N power switch units (SM M1 , SM M2 ,...,SM MN ) in series, and the lower switch group L consi...

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Abstract

The invention provides a dual-output single-phase three-switch-group MMC inverter without direct current bias and a control method of the inverter. The inverter comprises a direct current power supply, a first capacitor, a second capacitor, a third capacitor, a switch bridge arm, a first load and a second load. The switch bridge arm is formed by connecting an upper switch group, a middle switch group, a lower switch group and a coupled inductor in series. The upper switch group, the middle switch group and the lower switch group are respectively formed by connecting N power switch units in series. One end of the first load is connected to the middle point of the first capacitor and the middle point of the second capacitor, and the other end of the first load is connected to the upper end of the middle switch group. One end of the second load is connected to the middle point of the second capacitor and the middle point of the third capacitor, and the other end of the second load is connected to the lower end of the middle switch group. Carrier phase shifting PWM control is adopted for the inverter, two paths of N+1 level alternating voltages without direct current bias can be output, and the inverter is suitable for high-pressure, high-power and dual-load occasions. The coupled inductor in the inverter can be replaced by two independent inductors.

Description

technical field [0001] The invention relates to the field of module combined multilevel (MMC) converters, in particular to a dual-output single-phase three-switch group MMC inverter without DC bias and a control method thereof. Background technique [0002] At present, power converters are developing in the direction of miniaturization, high reliability and low loss. Under this trend, there are two directions for improving the converter: reducing passive components or improving the topology of the converter to reduce active components. New progress in the direction of source devices. Compared with the traditional four-switch converter, the single-phase three-switch converter reduces one switch and the corresponding drive circuit, and has certain advantages in the application considering cost and volume. However, the two single-phase outputs of the three-switch converter are both two-level, and the output AC waveform is relatively poor. In addition, the voltage stress on ea...

Claims

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Application Information

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IPC IPC(8): H02M7/537H02M7/483
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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