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n-output single-phase n+1 switch group mmc inverter and its control method

A switch group, inverter technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve problems such as increasing engineering costs, solve the problem of voltage equalization, improve quality, The effect of reducing engineering costs

Active Publication Date: 2016-06-22
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 N AC lines with different frequencies are connected, 2N MMC converters are required, which greatly increases the engineering cost

Method used

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  • n-output single-phase n+1 switch group mmc inverter and its control method

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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 and protection of the present invention are not limited thereto.

[0020] refer to figure 1 , the N-output single-phase N+1 switch group MMC inverter of the present invention includes a DC power supply U dc , a capacitor bridge arm, a switch bridge arm and N loads; the capacitor bridge arm consists of N+1 capacitors (C 1 、C 2 ,...,C N+1 ) in series, and the switch bridge arm consists of N+1 switch groups (B 1 , B 2 ,...,B N+1 ), the first inductance L 1 and the second inductance L 2 formed in series; the i-th switch group B of the switch bridge arm i consists of n power switching units (SM Bi1 , SM Bi2 ,...,SM Bin ) in series, where the value of i is 1 to N+1; one end of the kth load is connected to the k+1th capacitor C of the...

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Abstract

The invention provides an N-output single-phase N+1-switch-group MMC inverter and a control method of the N-output single-phase N+1-switch-group MMC inverter. The inverter comprises a direct current power source, a capacitor bridge arm, a switch bridge arm and N loads. The capacitor bridge arm is formed by N+1 capacitors in a series connection mode, and the switch bridge arm is formed by N+1 switch groups, a first inductor and a second inductor in a series connection mode. The ith switch group of the switch bridge arm is formed by n power switch units in a series connection mode, wherein the i ranges from 1 to N+1. One end of the kth load is connected to the positive pole of the k+1th capacitor of the capacitor bridge arm, and the other end of the kth load is connected to the upper end of the k+1th switch group of the switch bridge arm, wherein the k ranges from 1 to N-1. One end of the Nth load is connected to the positive pole of the N+1th capacitor of the capacitor bridge arm, and the other end of the Nth load is connected to the lower end of the N+1th switch group of the switch bridge arm. According to the inverter, carrier phase-shifting PWM control is adopted, and N n+1-level alternating voltages can be output.

Description

technical field [0001] The invention relates to the field of module combined multilevel (MMC) converters, in particular to an N-output single-phase N+1 switch group MMC inverter 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 2N switching converter, the single-phase N+1 switching converter reduces N-1 switches and corresponding driving circuits, and has certain advantages in applications considering cost and volume. However, the two single-phase outputs of the N+1 switching converter are both two-level, and the output AC waveform is relatively poor. In addition, the voltage stress of each switch in the N+...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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