Opposite Triangle Carrier with SVPWM for Common-Mode Voltage Reduction in Dual Three Phase Motor Drives

Abstract

The common-mode voltage (CMV) generated by the switching operation of the pulse width modulation (PWM) inverter leads to bearing failure and electromagnetic interference (EMI) noises. To reduce the CMV, it is necessary to reduce the magnitude of dv/dt and change the frequency of the CMV. In this paper, the range of the CMV is reduced by using opposite triangle carrier for ABC and XYZ winding group, and the change in frequency in the CMV is reduced by equalizing the dwell time of the zero voltage vector on ABC and XYZ winding group of dual three phase motor.

Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

“…In order to suppress the leakage current, the common mode voltage should be reduced or kept constant. To reduce the CMV for the traditional three-phase two-level H6 VSIs, both the PWM control methods [30][31][32][33][34][35][36][37][38] and system topology reconfiguration [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57] are introduced. In addition, the solutions for the CMV reduction of the impedance-source inverter topologies were also developed.…”

“…The active zero-state PWM and near-state PWM methods, and the remote-state SVM method in [33], can offer the constant CMV by using only the three active states in the odd active or even vectors. Moreover, the combination of other states can be applied to reduce the amplitude value of CMV, introduced in [34][35][36]. However, this solution limits modulation index range and output voltage quality, which reduces the output quality of the inverter.…”

“…The leakage current can be suppressed by reducing the amplitude and frequency of the CMV or breaking the PV array from the grid on the DC side of the inverter system. In recent years, many approaches have been made to overcome the CMV and leakage current in transformerless PV inverters [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The SVM control method is generally implemented to control the traditional threephase two-level H6 VSI.…”