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Multi-target large powder inverter common-mode voltage suppressing method

A common-mode voltage and high-power technology, which is applied in the field of multi-objective high-power inverter common-mode voltage suppression, can solve the problems of common-mode voltage hazards of high-power converters, reduce harmonic content, and expand the scope of use , save volume space and weight effect

Inactive Publication Date: 2010-10-13
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

[0007] The purpose of the present invention is to solve the hazards of the common-mode voltage of the high-power converter itself and solve the problems in the suppression of the common-mode voltage by the SVPWM control strategy, so that the system performance will not be affected while the common-mode voltage is suppressed

Method used

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  • Multi-target large powder inverter common-mode voltage suppressing method
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  • Multi-target large powder inverter common-mode voltage suppressing method

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specific Embodiment approach

[0033] The topology of a diode-clamped three-level inverter is as follows: figure 1 shown. It can be seen that each phase of the three-level inverter consists of two DC voltage dividing capacitors C 1 、C 2 (C 1 =C 2 ), 4 main switch tubes, 4 anti-parallel freewheeling diodes and two clamping diodes. Compared with traditional two-level inverters, diode-clamped three-level inverters have the advantages of reducing electromagnetic interference (EMI) and du / dt, reducing switching losses, and improving system reliability. Assume that the devices in the circuit are ideal devices, regardless of their conduction voltage drop. Depend on figure 1 It is known that each phase bridge arm has three switching states, and the output voltage of each phase has three different levels relative to the neutral point. Taking phase A as an example, its working principle is as follows: ①When the switching tube S a1 , S a2 Simultaneously turn on S a3 , S a4 When shutting off at the same time...

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Abstract

The invention relates to a multi-target large powder inverter common-mode voltage suppressing method. A direct current component is superimposed on a traditional symmetrical sine-wave modulation signal to improve direct current voltage utilization ratio and a novel modulation signal is constructed on the basis of the superimposed direct current component to enable common-mod can be fully eliminated, reducing the harmonic content and improving the direct current voltage utilization ratio. By adopting the method to control a multi-level converter, since the switch status of the multi-level converter is limited in the zero common-mode voltage, the common-mode voltage of the inverter is enabled to be zero, the common-mode voltage can be fully eliminated, the harmonic content is reduced and the direct current voltage utilization ratio is also improved. The method has the advantages that the hardware circuit is not required to be added, the realization is simple and easy, the occupied internal memory is small and the generality is high. The method of the invention is suitable for any places in which large power multi-level converters are used, such as large power variable-frequency transmission systems and FACTS devices in power systems.

Description

technical field [0001] The invention relates to a multi-objective high-power inverter common-mode voltage suppression method, which belongs to the related technical field of multi-level inverters. Background technique [0002] With the extensive application of high-voltage and high-power AC motor frequency conversion speed regulation systems and the development of applications such as DC transmission, reactive power compensation, and power active filters in power systems, multi-level inverters have become a major part of the current power electronics technology. An important research hotspot that has attracted people's attention. However, with the wide application of high-voltage and high-power multilevel inverters, some problems have also been discovered. Multilevel inverters generate large common-mode voltages. The common mode voltage will destroy the motor winding insulation system, generate electromagnetic interference (EMI), generate bearing current to accelerate bear...

Claims

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Application Information

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IPC IPC(8): H02P27/08H02M1/12
Inventor 章勇高李银玲
Owner EAST CHINA JIAOTONG UNIVERSITY
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