Reducing Common-Mode Voltage of Three-Phase VSIs using the Predictive Current Control Method based on Reference Voltage

Abstract

A model predictive current control (MPCC) method that does not employ a cost function is proposed. The MPCC method can decrease common-mode voltages in loads fed by three-phase voltage-source inverters. Only non-zero-voltage vectors are considered as finite control elements to regulate load currents and decrease common-mode voltages. Furthermore, the three-phase future reference voltage vector is calculated on the basis of an inverse dynamics model, and the location of the one-step future voltage vector is determined at every sampling period. Given this location, a non-zero optimal future voltage vector is directly determined without repeatedly calculating the cost values obtained by each voltage vector through a cost function. Without utilizing the zero-voltage vectors, the proposed MPCC method can restrict the common-mode voltage within ± V dc /6, whereas the common-mode voltages of the conventional MPCC method vary within ± V dc /2. The performance of the proposed method with the reduced common-mode voltage and no cost function is evaluated in terms of the total harmonic distortions and current errors of the load currents. Simulation and experimental results are presented to verify the effectiveness of the proposed method operated without a cost function, which can reduce the common-mode voltage.

Common Mode Voltage Suppression Method Based on Model Predictive Control for a Permanent Magnet Synchronous Motor Considering Current Error Limit

“…According to eqn (6), the values of the CMV corresponding to all of the 8 voltage vectors can be calculated as is shown in Table 1. As can be seen from Table 1, two zero vectors (V 0 and V 7 ) corresponding to the CMV amplitude V dc / 2, and six non-zero vectors (V 1 ~ V 6 ) corresponding to the CMV amplitude V dc /6.…”

“…This method removes two zero vectors, leaving only six non-zero vectors as candidates. References [6] and [7] use the idea of deadbeat control to achieve CMV suppression. Although this method can reduce the computational burden, but the differential part will produce a lot of noise.…”

A Comprehensive Double-Vector Approach to Alleviate Common-Mode Voltage in Three-Phase Voltage-Source Inverters with a Predictive Control Algorithm

“…In VSIs, the fast switching operation results in common-mode (CM) voltage, which has been considered the cause of over voltage stress to surrounding electronic systems [3][4][5][6][7][8]. To alleviate the amplitude of the CM voltage, multifarious studies have been conducted with a PWM algorithm that is designed by only selecting the non-zero active vectors, and this is because the zero vectors produce the highest CM voltage [3][4][5][6][7][8]. However, when the inverter is controlled by only using the non-zero active vectors without selecting the zero vectors, the Total Harmonic Distortion (THD) and error of the output currents of the inverter inevitably deteriorate.…”

Model Predictive Control Method with Constant Switching Frequency to Reduce Common-Mode Voltage for PMSM Drives

“…On the other hand, the model predictive control methods [14,15] to reduce the CMV (MPC-RCMV) have also been proposed in [16][17][18][19][20][21][22]. e MPC-RCMV method proposed in [16] adopts only six nonzero voltage vectors (VVs) to calculate the cost function and the CMV amplitude is reduced without utilizing zero VVs.…”

“…To eliminate the CMV spikes caused by the dead time, the method proposed in [19] preexcludes, from the candidates for future vectors, those voltage vectors which can increase the common-mode voltage during the dead time. A MPC-RCMV strategy without calculating the cost function is proposed in [20], where the nonzero optimal future VV is determined according to the basis of an inverse dynamics model. A two-vector based MPC-RCMV is proposed in [21], where two nonzero VVs are selected at every control period.…”