Reduction of Common-Mode Voltage in Multiphase Two-Level Inverters Using SPWM With Phase-Shifted Carriers

Space Vector Pulse Width Modulation with Reduced Common Mode Voltage and Current Losses for Six-Phase Induction Motor Drive with Three-Level Inverter

“…The common mode voltage can be considered as the voltage between the load neutral point and the midpoint of the DC bus [13]. So, the CMV is the same as von in Equation (13) and is given by:…”

“…The high frequency, high amplitude and large step size (dv/dt) of CMV produces bearing currents via parasitic capacitances which may lead to insulation and bearing failures [10], mechanical vibration [11] and also bearing undesirable electromagnetic interference (EMI) [12]. Several PWM techniques based on sinusoidal PWM [13][14][15] or SVPWM [16][17][18][19][20] strategies have been applied to reduce the CMV in multiphase systems. The researchers tried to reduce the CMV by phase shifting of carrier signal in control system of five-phase and six-phase (both symmetrical and asymmetrical) two-level voltage source inverters feeding R-L load, which leads to higher phase current harmonic and distortion [13].…”

“…Several PWM techniques based on sinusoidal PWM [13][14][15] or SVPWM [16][17][18][19][20] strategies have been applied to reduce the CMV in multiphase systems. The researchers tried to reduce the CMV by phase shifting of carrier signal in control system of five-phase and six-phase (both symmetrical and asymmetrical) two-level voltage source inverters feeding R-L load, which leads to higher phase current harmonic and distortion [13]. In literature, [14][15] three career based PWM methods were analyzed in terms of CMV generation on a five phase coupledinductor inverter with R-L load.…”

“…Moreover, most of the mentioned researches for reducing the CMV were done on multiphase inverter with an R-L, and the machine performance like electromagnetic torque ripple is not analyzed. Also, the presence of undesirable zcomponent currents in SPIM imposes a considerable limitation in PWM method (because lower number of space vectors can be applied) and it may lead to a challenge with CMV eliminating or reducing techniques, and is not considered in the above mentioned studies [13][14][15][16] and [20]. On the other hand, many researchers tried to reduce z-component currents in multi-phase drives without considering CMV production [5][6][7][8][9].…”

A Modified Controller for Three-Level Three-Phase Voltage Source Inverter based on Laguerre Functions

“…Pulse width modulation (PWM) methods have been widely applied to the control of VSI. Among a variety of PWM techniques, sinusoidal PWM (SPWM) and space vector PWM (SVPWM) are two mature techniques [9,10]. Other popular controllers include current controllers, such as the hysteretic current controller and the model predictive controller (MPC) [11,12].…”