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Suppression method for zero-sequence voltage caused by dual inverter switching dead area

A zero-sequence voltage, dual-inverter technology, which is applied in motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problems of zero-sequence voltage in the system and affect system performance, etc.

Active Publication Date: 2015-04-08
HARBIN INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of zero-sequence voltage in the system due to the addition of dead time when the switching signals of the dual inverters on the common DC bus, thereby affecting the performance of the system, and provides a dual inverter switching dead zone Suppression methods that lead to zero sequence voltage

Method used

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  • Suppression method for zero-sequence voltage caused by dual inverter switching dead area
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  • Suppression method for zero-sequence voltage caused by dual inverter switching dead area

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specific Embodiment approach 1

[0060] Specific implementation mode one: the following combination Figure 1 to Figure 15 Describe this embodiment, the suppression method of the zero-sequence voltage caused by the dead zone of the double inverter switch described in this embodiment, the suppression method is based on the SVPWM modulation using a combination of switches that do not generate zero-sequence voltage, the suppression method first The three-phase voltage signal of the double inverter is collected by the voltage sensor, and the three-phase voltage signal is the three-phase voltage signal after RC low-pass filtering; then the three-phase voltage signal is processed to obtain the system zero-sequence voltage; then according to The zero-sequence voltage of the system is calculated in the dead zone to obtain the compensation voltage vector, so that the zero-sequence voltage generated by the compensation voltage vector offsets the zero-sequence voltage of the system to realize the suppression of the zero-...

specific Embodiment approach 2

[0062] Specific Embodiment 2: This embodiment will further explain Embodiment 1. The method for obtaining the zero-sequence voltage of the system is: the three-phase voltage signals of the dual inverters collected by the voltage sensor are summed and calculated through an operational amplifier circuit, The calculated result is converted into a digital system zero-sequence voltage through an analog-to-digital converter.

[0063] The conversion of the summation result in this embodiment can be realized by the A / D of the DSP, and the analog quantity is converted into a digital quantity.

specific Embodiment approach 3

[0064] Specific implementation mode three: this implementation mode further explains implementation mode two, and the method for obtaining the compensation voltage vector is:

[0065] First, reverse the polarity of the zero-sequence voltage of the system to obtain the polarity of the zero-sequence voltage generated by the compensation voltage vector;

[0066] Then according to the polarity of the zero-sequence voltage generated by the compensation voltage vector and the sector where the reference voltage vector U* is located, determine the switch combination of the compensation voltage vector;

[0067] Then by increasing the conduction time of one of the two switch signals with the maximum duty cycle, the conduction time of the switch signal is increased to 2 times the dead zone time, thereby obtaining an action time of 2 times the dead zone Time-compensated voltage vector.

[0068] The zero-sequence voltage generated by the compensation voltage vector obtained in this embodi...

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Abstract

The invention discloses a suppression method for zero-sequence voltage caused by a dual inverter switching dead area, belongs to the technical field of inverter control and aims to solve the problems that a system has zero-sequence voltage and system performances are affected due to addition of dead time when common direct-current bus dual inverter switching signals are switched. Based on SVPWM (space vector pulse width modulation) performed by a switch combination without zero-sequence voltage, the suppression method includes the steps: firstly, acquiring three-phase voltage signals after RC (resistance-capacitance) low-pass filter of dual inverters by a voltage sensor; processing the three-phase voltage signals to obtain system zero-sequence voltage; performing dead area compensation calculation according to the system zero-sequence voltage to obtain a compensation voltage vector, offsetting the system zero-sequence voltage by the zero-sequence voltage generated by the compensation voltage vector, and suppressing the system zero-sequence voltage. The suppression method is used for suppressing the zero-sequence voltage caused by the dual inverter switching dead area.

Description

technical field [0001] The invention relates to a method for suppressing zero-sequence voltage caused by a double-inverter switch dead zone, and belongs to the technical field of inverter control. Background technique [0002] The drive system of open-winding AC motors is powered by dual inverters, and the performance of the drive system of open-winding AC motors is improved compared to the drive system of star-connected winding AC motors with single-ended power supply. According to whether the DC buses of the dual inverters are connected in parallel, the dual inverters are divided into dual inverters with a common DC bus and dual inverters with an isolated DC bus. Among them, the buses of the common DC bus dual inverters are connected in parallel and powered by a DC power supply, which has the advantage of simple structure, but because the sum of the motor three-phase winding currents is not clamped to zero, there is a potential zero-sequence voltage in the system and zero...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02P21/14H02P27/12
CPCH02M7/5387H02P27/085H02M1/0038
Inventor 安群涛段建东毕恺韬孙力
Owner HARBIN INST OF TECH
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