A SVPWM to Eliminate Common-Mode Voltage for Multilevel Inverters

Abstract

This paper presents a new space vector pulse width modulation (SVPWM) to eliminate common-mode voltage (CMV) for multilevel inverters. The proposed SVPWM is performed in a new coordinate system, in which the converter voltage vectors have only integer entries and the absolute coordinate increment between adjacent vectors is equal to 1. The location of the reference vector, detection of the nearest three CMV vectors, and duty cycles of the nearest three CMV vectors are all obtained by simple calculations, no lookup table is needed and the SVPWM is computationally fast. Compared with earlier pulse width modulations (PWMs), the realization of the CMV vectors is very simple, and the CMV of multilevel inverters are limited to zero with any modulation index. Because the SVPWM is independent of the level number of the inverter, the proposed SVPWM is suitable for any level of inverter. This paper also thoroughly compares the proposed SVPWM with prior PWMs. Experimental results are also given in the paper.

Investigations on EMI Mitigation Techniques: Intent to Reduce Grid-Tied PV Inverter Common Mode Current and Voltage

“…The reference modulating signals are mathematically defined as follows: (5) In this technique, approximately 17% of third harmonics components are added in the reference waveform of classical SPWM [29,30,34]. The reference waveform of the method third harmonics injection can be also expressed as follows:…”

Vector Weighting Approach and Vector Space Decoupling Transform in a Novel SVPWM Algorithm for Six‐Phase Voltage Source Inverter

“…In this way, we can synthesize 12 voltage vectors which have the same distribution as the traditional two vector SVPWM algorithm, but the magnitude is different. So the reference voltage vector v r in -subspace can be synthesized by using 12 midvectors, and the basic principle is the same as the traditional two vector SVPWM algorithm, the dwell time of mid-vectors Ta and Tb can be calculated according to (5), and |V max | must be replaced by the variable |V max |, and the dwell time of vectors 3 , and v 4 can be obtained by…”

“…Compared with the pulse width modulation (PWM) control algorithm for conventional three-phase motors, the PWM method for six-phase motors is more flexible [1][2][3][4][5][6]. At present, carrier-type PWM algorithm, permanent-magnet synchronous motor SVPWM algorithm, and current hysteresis PWM algorithm are three of the PWM algorithms that are commonly used for multiphase two-level voltage source inverter (VSI) [7,8].…”

Dynamic and Adjustable New Pattern Four-Vector SVPWM Algorithm for Application in a Five-Phase Induction Motor

“…Many SVPWM control methods have been proposed to solve the above problems in different applications [8][9][10][11][12][13][14][15][16][17][18]. A new coordinate system SVPWM method was developed to eliminate common-mode voltage for multi-level inverters [8]; a five-phase SVPWM algorithm based on a modulation function was used to improve the computing speed and precision, replacing the traditional multiplication and division operation [9,10]; zero-sequence signal injection for a carrier-type multiphase inverter was used to improve PWM wave characteristics and reduce the influence of harmonics on the system [11]; reference voltage decomposition was used to calculate a multi-level space vector to simplify calculations and optimize the switching state [12]; a model of a three-phase VSI (voltage source inverter) and CSI (current source inverter) was presented and the THD (total harmonic distortion) of two models was analyzed based on the SVPWM technique [13]; and a novel SVPWM control technique for a nine-phase induction motor was used to improve the linear modulation region and create a better harmonic profile [14]. The random SVPWM method has attracted attention as a solution in recent years [15][16][17][18].…”