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Half-bridge modular multi-level single-phase inverter and modulation method

A modular multi-level, single-phase inverter technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., to reduce the number of capacitors, achieve accurate output, and increase energy density Effect

Active Publication Date: 2022-07-26
SHANGHAI JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent still has room for improvement in reducing the size of the inverter and simplifying the modulation strategy of the inverter

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  • Half-bridge modular multi-level single-phase inverter and modulation method
  • Half-bridge modular multi-level single-phase inverter and modulation method
  • Half-bridge modular multi-level single-phase inverter and modulation method

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Embodiment Construction

[0034] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.

[0035] According to a modulation method of a half-bridge modular multi-level single-phase inverter provided by the present invention, the method includes: step 1: calculating the switching period T of system operation from a given operating frequency f; step 2: starting time of the period , based on a given capacitor voltage rating V C , DC side rated voltage V DC and the AC side modulation voltage v * AO , calculate the number N of sub-modules working in mode S1 and mode S2 1 , N 2 ; Step 3: Measure the c...

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Abstract

The invention provides a half-bridge modular multi-level single-phase inverter and a modulation method, comprising: a capacitor bridge arm and a modular multi-level bridge arm; the modular multi-level bridge arm includes: two ports sub-module; the capacitor bridge arm and the modular multilevel bridge arm each include a DC positive terminal, a DC negative terminal and an AC terminal; the DC positive terminal of the capacitor bridge arm and the modular multilevel terminal The DC positive terminal of the bridge arm is connected to the positive terminal of the DC power supply; the DC negative terminal of the capacitor bridge arm is connected to the DC negative terminal of the modular multi-level bridge arm and is connected to the negative terminal of the DC power supply The AC terminal of the bridge arm of the capacitor and the AC terminal of the modular multi-level bridge arm together constitute the AC output port of the single-phase inverter. The novel nearest-level approximation modulation strategy proposed by the present invention for the topology can realize accurate topology output and maintain the effective operation of the system.

Description

technical field [0001] The invention relates to the field of direct current power transmission and the field of power electronic converter design and control, in particular to a half-bridge modular multi-level single-phase inverter and a modulation method. Background technique [0002] The rapid development of power electronic technology and the wide application of power electronic equipment have significantly improved the controllability and intelligence of the power grid, and promoted the transformation of the power grid form. A large number of HVDC transmission lines and equipment have appeared in the AC grid. DC load and DC distribution system will also be an important part of the future power system. In the future, there will be a multi-voltage level AC-DC hybrid situation in the power system. As the core equipment of DC-AC power conversion, the steady-state and dynamic performance of the inverter will directly affect the safe and stable operation of the grid side and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/797H02M7/483
CPCH02M7/797H02M7/483H02M1/0074H02M1/0077H02M7/4835
Inventor 朱淼陈阳马建军王晗徐莉婷蔡旭
Owner SHANGHAI JIAOTONG UNIV
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