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A Rotational Discontinuous Control Method for Modular Multilevel Converter

A modular multi-level, control method technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of large circuit loss, low circuit efficiency, carrier phase shift modulation switch The problem of high frequency can achieve the effect of improving circuit efficiency, low switching loss, and improving circuit reliability.

Active Publication Date: 2022-04-19
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carrier phase-shift modulation has limitations such as high switching frequency, large circuit loss, and low circuit efficiency.

Method used

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  • A Rotational Discontinuous Control Method for Modular Multilevel Converter
  • A Rotational Discontinuous Control Method for Modular Multilevel Converter
  • A Rotational Discontinuous Control Method for Modular Multilevel Converter

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Embodiment Construction

[0036] Below in conjunction with embodiment, the present invention is described in further detail:

[0037] like figure 1 As shown in the figure, there are N cascaded H-bridges cascaded in the figure. Applying a modular multilevel converter rotation discontinuous control method provided by the present invention to the H-bridge topology has fewer switches compared with the traditional modulation method The number of times, the switch in the circuit does not always operate at high frequency, but switches between high frequency and low frequency. Under the modulation of the rotating DPWM modulation wave, the left bridge arm modulation wave and the right bridge arm modulation wave of the circuit topology are generated. The left bridge arm Both the modulation wave and the right bridge arm modulation wave include a clamping part and a modulation part, which can effectively reduce the switching times and improve circuit efficiency. The side bridge arm modulation wave and the right br...

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Abstract

The invention discloses a rotation discontinuous control method of a modular multilevel converter, comprising the following steps: S1, determining the number N of cascaded H bridges, and determining the switching frequency k of the circuit according to the number N of cascaded H bridges Triangular carrier V c The phase shift angle θ and the required triangular carrier V c Number N; S2, determine the DC side voltage V of the circuit in , the resistive and inductive loads R and L in the circuit; S3, determine the modulation degree m and the clamping angle α, obtain the rotating DPWM modulation wave, and generate the left bridge arm modulation wave and the right bridge arm modulation wave of the corresponding circuit topology under the rotation DPWM modulation wave modulation The arm modulation wave, the left bridge arm modulation wave and the right bridge arm modulation wave all include a clamping part and a modulating part, which are compared with the triangular carrier wave to generate a driving signal, and then drive the circuit to complete the corresponding modulation process. During the clamping time, the switch remains normally on or off, and during the normal modulation time, the switch operates at high frequency.

Description

technical field [0001] The invention relates to the technical field of multilevel inverters, in particular to a method for non-continuous rotation control of a modularized multilevel inverter. Background technique [0002] In recent years, multilevel inverters have been widely used in high voltage and high power systems. Multilevel inverters have the advantages of high voltage system capability, low harmonic distortion, easy expansion and high fault tolerance. Therefore, multilevel inverters are widely used in HVDC transmission systems and renewable energy systems. Multilevel inverters have various topologies, among which cascaded H-bridges are one of the most widely used topologies. There are many modulation methods for cascaded H-bridges, including carrier phase shifting, carrier stacking, and discontinuous modulation. Carrier phase-shift modulation technology has great performance advantages, which can not only ensure the power balance between modules, but also ensure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M7/487H02M1/08
CPCH02M7/53873H02M7/487H02M1/08
Inventor 郭小强王凡王晓明卢志刚华长春马瑞斯·马利诺夫斯基乔瑟夫·格莱罗
Owner YANSHAN UNIV
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