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Pulse width modulation method for H-bridge cascading-type inverter

A pulse width modulation and inverter technology, which is applied in the direction of converting irreversible DC power input into AC power output, output power conversion device, high-efficiency power electronic conversion, etc. The research results of the inverter are rare, and the calculation complexity of the switching angle is increased, so as to achieve the effect of reducing the total harmonic current distortion rate, low switching frequency and reducing switching loss.

Active Publication Date: 2017-04-12
中国船舶重工集团公司第七一二研究所
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Problems solved by technology

[0006] SOPWM can effectively solve the problems of low switching frequency power quality and instantaneous power balance of H-bridge units; since SOPWM has been researched in two-level and three-level inverters, it is applied to multi-level H-bridge cascading type inverter will increase the complexity of switching angle calculation, so the research results of multi-level H-bridge cascaded inverter based on SOPWM are rare

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  • Pulse width modulation method for H-bridge cascading-type inverter
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  • Pulse width modulation method for H-bridge cascading-type inverter

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[0044] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0045] Such as figure 1 As shown, considering the complexity of circuit topology and modulation method, five-level is a multi-level topology that is widely used. The present invention takes five-level inverters to drive asynchronous motors as an example. The analysis of the flat inverter is similar.

[0046] The switching angle optimization calculation process of the H-bridge cascaded inverter SOPWM method is as follows: figure 2 shown, including the following steps:

[0047] Step S10

[0048] According to the performance requirements of the control system, the number of switching angles and the modulation ratio m interval of a single H-bridge inverter in a 1 / 4 cycle are determined. Let the maximum allowable operating frequency of the switching device be f smax , the fundamental voltage frequency is f 1 , for a single H-bridge inverter,...

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Abstract

The invention discloses a pulse width modulation method for an H-bridge cascading-type inverter, and the method comprises the following steps: setting a specific function optimization target with the minimum harmonic current, and a nonlinear constraint with the H-bridge power balance; solving an initial switching angle value of a corresponding modulation degree through employing a genetic algorithm; solving an optimal switching angle value through employing a nonlinear programming function Fmincon; carrying out the planning of switching angle values in a whole modulation ratio range, and carrying out the serialization of the switching angle values in an allowed specific function index. The method employs a multilevel synchronization optimization pulse width modulation method to effectively solve problems of energy quality at low switching frequency and the instantaneous power balance of an H-bridge module, and is successfully used in the field of AC transmission.

Description

technical field [0001] The invention relates to a modulation method of a multilevel inverter, in particular to a synchronous optimization pulse width modulation method of an H-bridge cascaded inverter. Background technique [0002] Traditional multi-level modulation techniques include carrier phase-shifted PWM (CPS-PWM), stacked PWM (Phase disposition pulse-width modulation, PD-PWM), multi-level space vector PWM (Space vector pulse-width modulation, SVPWM) and multi-level SHEPWM (Selective harmonic elimination pulse-width modulation, SHEPWM), etc. [0003] CPS-PWM can automatically realize the power balance of the H-bridge unit, but the voltage utilization rate is low. PD-PWM cannot naturally achieve power balance, and the pulse sequence of each power module needs to be cycled within half a cycle. When multi-level SVPWM is applied to multi-level inverters, when the number of output voltage levels is greater than 5, the voltage vector selection and action time calculation a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/49H02M1/088
CPCH02M1/088H02M7/49H02M1/0054Y02B70/10
Inventor 邱长青张新民高晓峰陈伟方华松
Owner 中国船舶重工集团公司第七一二研究所
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