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Capacitor voltage fluctuation suppression method of modular multilevel matrix converter

A modular multi-level, matrix converter technology, applied in the direction of converting AC power input to DC power output, electrical components, circuit devices, etc., can solve problems such as excessive capacitor voltage fluctuations, and achieve the effect of increasing control complexity

Active Publication Date: 2021-10-29
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to solve the problem that the sub-module capacitor voltage fluctuates too much when the M3C runs at the same input and output frequency

Method used

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  • Capacitor voltage fluctuation suppression method of modular multilevel matrix converter
  • Capacitor voltage fluctuation suppression method of modular multilevel matrix converter
  • Capacitor voltage fluctuation suppression method of modular multilevel matrix converter

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Embodiment Construction

[0047] The specific method described in the present invention will be described in more detail below in conjunction with the accompanying drawings of the present invention.

[0048] The capacitive voltage fluctuation suppression method of the modularized multilevel matrix converter of the embodiment of the present invention comprises the following steps:

[0049] Step 1. Model the converter according to the input and output voltage and current of the system to obtain the power of the bridge arm, and then obtain the expression of the voltage fluctuation of the sub-module capacitor;

[0050] like figure 1 As shown, according to the topology of the 3×3 modular multilevel matrix converter M3C, the system specifically includes 9 bridge arms, and each bridge arm includes N sub-module units and a bridge arm inductor L. Each sub-module unit consists of an H-bridge as well as a capacitor, where figure 1 The upper right is the H-bridge sub-module, which specifically includes 4 power s...

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Abstract

The invention relates to a capacitor voltage fluctuation suppression method for a modular multilevel matrix converter, which comprises the following steps of: step 1, modeling the converter according to input and output voltage and current of a system to obtain the power of a bridge arm, and further obtaining an expression of capacitor voltage fluctuation of a sub-module; step 2, analyzing leading factors causing bridge arm capacitor voltage according to the obtained formula of the capacitor voltage fluctuation ripples of the sub-modules; and step 3, providing parameter design of a double-sine-wave bridge arm injection method under the condition that the input frequency and the output frequency are similar. According to the invention, the condition that the capacitor voltage fluctuation of the sub-module is too large under the working condition can be effectively inhibited, and the input and output of the system are not influenced at all.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a method for suppressing capacitance voltage fluctuations of a modularized multilevel matrix converter. Background technique [0002] Modular Multilevel Matrix Converter (M3C) is a relatively novel topology for realizing AC-AC conversion. At present, it has been able to realize AC frequency conversion between three phases and other AC conversions. At the same time, it has the advantages of modularization and large number of levels, and has the advantages of both the traditional matrix converter (Matrix Converter, MC) and the back-to-back structure of the modular multilevel converter (MMC). It is also very advantageous in the low frequency state. In addition, in the fields of wind power generation and tidal power generation, M3C has excellent application prospects because of its good dynamic and static characteristics. like figure 1 The topological structure...

Claims

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Application Information

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IPC IPC(8): H02M7/487H02M1/12H02M1/15H02M7/5387H02J3/24
CPCH02M7/487H02M1/12H02M1/15H02M7/53871H02J3/241Y02E10/76
Inventor 卢浩杭丽君何震何远彬曾平良
Owner HANGZHOU DIANZI UNIV
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