Space‐vector‐based hybrid PWM for reduced line current ripple and common mode voltage in paralleled interleaved three‐phase two‐level converter

Abstract

This paper proposes a hybrid space vector modulation (HBSVM) to reduce line current ripple while maintaining the optimal common mode voltage and zero sequence circulating current peak. The analysis reveals that the vector errors can be reduced by an equivalent basic vector with an adjustable length, which is synthesised by two basic vectors of the same vector angle. Then, a variable k is defined to denote the distribution of the two basic vectors. In addition, due to the implementation of k, a special vectors timing sequence is proposed. With the proposed generalised sequence, this paper investigates the current ripple over the switching period. Furthermore, we derive a map of the optimal distribution factor k opt to minimise the current ripple. Each 30° sector is divided into three subsectors; each applies k opt to minimise the current ripple. With the proposed two variables (p and q), a simple flowchart for k opt selection in the whole space vector plane is developed. The proposed HBSVM uses the optimal distribution k opt according to the position of the reference voltage, achieving the minimised line current ripple. The proposed HBSVM achieves the best line current quality while maintaining the optimal ZSCC and CMV peak, as validated by experiments.

Study on Harmonic Suppressing Performance of Random Space Vector PWM in Electric Vehicle

“…In the electric driving system, the motor converts electrical energy into mechanical motion that drives the vehicle; and the power inverter changes the direct current (DC) form from the battery to the alternating current (AC) form fed to the motor. The space vector pulse width modulation (SVPWM) widely used in the motor vector control generates the pulse control signals for the inverter based on the volt-second balance principle [5,6]; therefore, the harmonic is inevitable besides the required fundamental in the output phase voltage and current, which results in the harmonic electromagnetic torque [7,8,9,10]. The traditional deterministic SVPWM strategy exhibits prominent clustering harmonics with big amplitudes around the switching frequency and its integer multiples because of the fixed pattern with switching frequency or period, fixed pulse positioning method, and so on.…”

An optimal zero‐sequence voltage injection‐based common‐mode voltage reduction pulse‐width modulation for the reduction of common‐mode voltages in both amplitude and third‐order component

“…As one of the key technologies of 2L-VSIs, pulse width modulation (PWM) strategies have been received great attention by the researchers. Many PWM strategies have been proposed to realize various control objectives, such as output waveform quality improvement [1,2], switching losses reduction [3,4], common-mode voltage (CMV) suppression [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], and dead time compensation [20,21]. With the increase in switching frequency of power electronic devices, the CMV produced by 2L-VSIs causes some negative effects.…”

Simplified hybrid space vector modulation for multilevel diode clamped converter

“…Along with the evolution of MLC topologies, numerous research papers have grown up around the theme of modulation techniques dedicated to MLCs control [3, 5–7]. Among them, space vector modulation (SVM) has emerged as powerful modulation technique due to its significant advantages in terms of waveform quality improvement, full utilisation of DC‐bus and suitability for digital applications [3, 8].…”