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Simplified multi-level space vector pulse width modulation method for any-level single-phase cascaded H-bridge type converter and modulation soft core thereof

A technology of space vector pulse width and modulation method, which is applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., to avoid repeated design, low computational complexity, and strong scalability.

Inactive Publication Date: 2015-12-23
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the floating-point DSP in this structure still needs to complete the calculation work related to space vector modulation

Method used

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  • Simplified multi-level space vector pulse width modulation method for any-level single-phase cascaded H-bridge type converter and modulation soft core thereof
  • Simplified multi-level space vector pulse width modulation method for any-level single-phase cascaded H-bridge type converter and modulation soft core thereof
  • Simplified multi-level space vector pulse width modulation method for any-level single-phase cascaded H-bridge type converter and modulation soft core thereof

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Embodiment Construction

[0032] figure 1 It shows that the topological structure of single-phase cascaded H-bridge converter with any level number applicable to the present invention is as follows: the topology is divided into n units from top to bottom, and the DC side voltage of each H-bridge unit is E , converter output voltage u AB It is the sum of the output voltages of each H-bridge unit in this phase. Converter output current i AB by figure 1 The middle arrow points to the positive direction. The converter output voltage has (2n+1) levels: -nE, -(n-1)E, ... -2E, -E, 0, E, 2E, ... (n-1)E, nE. At the same time, it is defined that when the switch of the upper bridge arm of the H-bridge unit is turned on and the switch of the lower bridge arm is turned off, the state of the bridge arm is 1; when the switch of the upper bridge arm of the H-bridge unit is turned off, and the switch of the lower bridge arm is turned on, the state of the bridge arm is 0. Therefore, the voltage vector space has ...

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Abstract

The invention discloses a simplified multi-level space vector pulse width modulation method for an any-level single-phase cascaded H-bridge type converter and a modulation soft core thereof. At starting time of each switching period Ts, sampling of reference space voltage vectors Ur<(N)> is carried out to obtain reference space voltage vectors of all units one by one; section determination is carried out on the reference space voltage vectors Ur(1) <(N)>, Ur(2) <(N)>, ... Ur(n) <(N)> by using shared computing resources and calculation is carried out to obtain switching time; and shunting is carried out on switching time corresponding to all units based on multi-path signal selection and generation of PWM signals corresponding to all units is completed. With the method, modulation of the single-phase cascaded H-bridge type converter can be realized. On the basis of the technology, balanced energy distribution of all power units can be realized easily; the harmonic characteristics are good; the expandability is high; the computation complexity is low; digital realization becomes easy; and the dynamic and steady performances are excellent. The method can be applied to fields like a high-voltage high-power speed regulation system, a high-voltage direct-current power transmission system, and an electrical railway traction power supply system and the like.

Description

technical field [0001] The invention relates to the design and manufacture fields of a high-voltage and high-power speed regulation system, a high-voltage direct current transmission system, an electrified railway traction power supply system, and a high-power static var generator. Background technique [0002] In recent years, multilevel converters have received extensive attention in high-voltage and high-power applications due to their unique structural characteristics. At present, the common voltage source multilevel converters can be roughly divided into two categories: clamp type and cell cascade type. With the increase of the number of levels, the former requires a sharp increase in the number of switching devices and is not conducive to modularization, integration and expansion, so that it is limited in practical applications, while the cascaded H-bridge multilevel converter (cascaded H-bridge multilevel converter, CHMC) has been widely used in various fields due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
Inventor 宋文胜吴瑕杰熊成林冯晓云葛兴来王青元
Owner SOUTHWEST JIAOTONG UNIV
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