Decentralized space vector pulse width modulation method for multilevel single-phase half bridge converters

This paper investigates the effect of (voltage source) inverter's non-linearity on the space vector pulse width modulation (PWM) method and the discontinuous PWM methods, DPWM0, DPWM1, and DPWM2. The inverter's non-linearity of dead-time and minimum pulse-width are considered. These non-linearity's impose distortion regions where their effects cannot be properly compensated. The distortion regions are identified for the various PWM methods in space vector diagram format. A method to switch between DPWM methods to avoid the distortion regions while minimizing switching losses is proposed for the middle modulation indexes. At high modulation indexes, a method to modify the DPWM1 switching function is proposed which preserves the fundamental component while taking into consideration the inverter's non-linearity. The proposed methods are experimentally verified and shown to reduce the harmonics in the motor phase currents which would normally be induced due to the inverter non-linear effects. As a result, the proposed method allows for smoother torque production

The articles introduces the basic principle of space-vector pulse width modulation(SVPWM), and its arithmetic and fixed parameter is presented in detail, present a space-voltage vector pulse width modulation(SVPWM) method based on the 2-phased hybrid stepper motor driven by H bridge. The experiment is simulated by Matlab/Simulink in at last, the simulation result proved that the arithmetic used SVPWM to control the 2-phase hybrid stepper motor is feasible.

With the development of power semiconductor and digital processor technology, the design and application of three-level inverter in electric multiple units(EMU) are more and more extensive. The traditional space vector pulse width modulation (SVPWM) method for the three-level inverter requires estimating the sectors and calculating a lot of trigonometric functions. As a result, the calculation of SVPWM method for microprocessor is very complicated and large. To reduce the calculation working of the PWM module, a SVPWM method based on 60° coordinate system for three-level inverter is focused and discussed in this paper. Finally, a vector control system of asynchronous motor based on DSP was built up to verify the feasibility of this SVPWM method in this paper. Experimental results show that the adopted method can omit a lot of trigonometric functions, and reduce the calculating burden of the control system.

Electric drive on an electric bike, consist of electric motor, power converter and electronic controller. These are the mover of electric vehicle system. This paper discussed the three-phase inverter with Space Vector Pulse Width Modulation (SVPWM) method as a three-phase induction motor drive in electric bike application. The discussed that are modeled by using MATLAB/SIMULINK. The purpose of this paper is to get the analysis of the three-phase inverter SVPWM as a three-phase induction motor drive with specification 500 W, 50 V, 50 Hz and 8 poles. Converter using a battery with a voltage 48 V. Before the battery voltage is converted by an inverter, battery voltage was increased through a boost converter up to 70.62 V. Through simulation with MATLAB software was obtained curve of sinusoidal voltage, current, and speed of the motor by SVPWM controlled system. In this paper also tested against changes in the value of the fundamental frequency inverter. Test results show that the inverter can be set the speed of the motor at a frequency of 20 Hz to 50 Hz. Electric drive on an electric bikes, consist of electric motor, power converter and electronic controller. These are the mover of electric vehicle systems. This paper discussed the three-phase induction motor supplied by Space Vector Pulse Width Modulation (SVPWM) inverter. They discussed that are modeled by using MATLAB/SIMULINK. The purpose of this paper is to get the analysis of the three-phase inverter SVPWM as a three-phase induction motor drive with specification 500 W, 50 V, 50 Hz and 8 poles. Converter using a battery with a voltage 48 V .

Variable frequency and variable voltage are increasingly supplied by a three-level voltage source inverter for variable speed applications. The appropriate output voltage at the line side of the inverter is obtained using a suitable pulse width modulation technique. This chapter investigates the three-level Diode Clamped or Neutral Point Clamped topology, which is a popular multi-level topology. The modulation wave is generated using two Sine-triangle methods and two Space Vector Pulse Width Modulation methods. To produce the PWM signals for the three phases, these modulation waves are compared to a triangular carrier. Instead of the three phase modulating waves used in SPWM, a rotating reference voltage vector is used as a voltage reference in SVPWM methods. The magnitude and frequency of the line side's fundamental variable are controlled by the magnitude and frequency of the reference vector, respectively. Because of its higher dc bus utilization and lower harmonic distortion than SPWM, Space Vector Modulation has become a common PWM technique for three-phase Voltage Source Inverters. In MATLAB/SIMULINK software, the four PWM methods are simulated and compared for THD and Capacitor Balance. Embedded Editor and Matlab Editor Functions are used to build the programs. As compared to Sine PWM, simulation results show that Space vector PWM better utilizes dc bus voltage, produces less THD, and improves capacitor balance.

In this paper, a novel approach to realize the carrier-based pulse width modulation (CBPWM) method for indirect matrix converter (IMC) is presented. The advantage of the proposed CBPWM method is that only one triangular carrier signal with constant gradient falling and rising edges is used to generate the PWM to the power switches in both the rectifier and the inverter stages of IMC. The analysis of the proposed CBPWM method is based on the space vector approach and the relationship between CBPWM and space vector pulse width modulation (SVPWM) methods is provided. In this paper, four CBPWM methods called: sinusoidal PWM, third harmonic injection PWM, symmetrical PWM and discontinuous PWM are presented. These different CBPWM schemes are established according to the distribution of zero vectors and the switching pattern of the SVPWM method. The comparison of output voltage performance with different CBPWM schemes are investigated. Compared to the conventional method the calculation time of the proposed method is reduced around 50%. Concretely, the calculation time of the SVPWM method is 45 μs, while the calculation time of the proposed method is 22 μs. The experiments have been carried out to show the effectiveness of the proposed method.

In this paper, speed-sensorless input-output linearisation controller (IOLC) based direct torque control (DTC) of induction motor (IM) is implemented in simulation. The switching states of the inverter are determined by the space vector pulse width modulation (SVPWM) method to provide switching conditions with constant switching frequency instead of the lookup table-based conventional DTC method. Thus the torque and flux fluctuations, total current harmonic distortions and switching loss are decreased. In this drive system, IOLC is used instead of proportional-integral (PI) controller to obtain voltage reference vector of the SVPWM. In order to increase the control performance, an extended Kalman filter (EKF)-based estimator is used for the estimation of stator resistance in addition to stator current, stator flux, rotor mechanical angular velocity and load torque. According to the simulation results, it is understood that the sensitivity of the drive system to stator resistance is eliminated by EKF-based estimator and a very high dynamic control performance is achieved with the accurate estimations of EKF algorithm.

The common-mode voltage in three-phase inverter may harm the motor drive system. If only non-zero space vector is used, it can be suppressed by appropriate Space Vector Pulse Width Modulation (SVPWM) method. In this paper, a Nonzero Vector Pulse Width Modulation (NZPWM) technique is proposed to suppress common-mode voltage for three-phase inverter. In sectors I, III and V, instead of the real zero voltage vectors, two opposite voltage vectors near to the active voltage vectors are utilized. In sectors II, IV and VI, the first active voltage vector and the voltage vector opposite to the first active voltage vector are utilized. Therefore, the amplitude of common-mode voltage can be reduced to one sixth of DC bus voltage. Simulation and experimental results show that the proposed NZPWM is effective for common-mode voltage suppression.

This study proposes a space vector pulse width modulation (SVPWM) driving method for the switched reluctance motor (SRM), which enables the use of a standard full‐bridge power converter to drive a three‐phase SRM with a ring structure, in place of the traditional asymmetric H‐bridge (AHB). Based on this driving topology, the SVPWM approach is employed to drive the SRM, and its performance is compared with that of the conventional SRM driving method utilising the AHB. The findings indicate that the SVPWM method can effectively reduce torque ripple in the SRM. Moreover, the experimental validation performed to verify the proposed driving topology and method yields results that closely align with the simulated outcomes.

This paper presents a simplified space vector pulse width modulation (SVPWM) method for multilevel converters based on a line voltages coordinate system. In the proposed SVPWM technique, the solution of the working space vectors and their dwelling time are simplified. In order to flexibly obtain different switching sequences, the nearest-level modulation (NLM) principle is applied. Hence, only one of three wording space vectors needs to be detected. The proposed algorithm is independent of level numbers and the generated redundant switching sequences can be used to improve the potential performance of multilevel converters. It is flexible, fast and finally verify by simulation and experimental results.

The direct torque control theory has achieved great success in the control of permanent magnet synchronous motor. A Direct Torque Control (DTC) scheme of Permanent Magnet Synchronous Motor (PMSM) is presented. Based on in-depth analysis of PMSM mathematical model in abc frame and  frame are established and the operation principle of DTC-SVPWM system, the relationships between the torque and fundamental components. A novel space vector pulse width modulation (SVPWM) method which has a feature of low harmonic is proposed. The proposed method is adopted to implement the direct torque control (DTC) of a three-phase PMSM. A large number of simulation results show that the DTC System of PMSM has fast response and good dynamic performance. Aiming at the direct torque control in PMSM Drives, in this paper explained the theoretical basis of the direct torque control (DTC) for PMSM firstly. Then explained the difference between the applications of DTC-SVPWM to PMSM. Finally the MATLAB/Simulink models were developed to examine the DTC- SVPWM for PMSM. The simulation results is presented in this paper.

Three-phase three-level transformer-less inverters are widely used in photovoltaic (PV) generation systems because of their low cost and high efficiency. However, common-mode (CM) currents in these inverters are so large that they threaten security and aggravate EMI problems. Some space vector pulse width modulation (SVM) methods have been developed to reduce CM current through reducing CM voltage, but they would also sacrifice the modulation index or efficiency. This paper proposes a new SVM method that suppresses the CM current without reducing the efficiency or the modulation index. Moreover, simultaneous switching during dead time is analyzed thoroughly and a compensation method is proposed to eliminate the influence of dead time. Experiments verify that compared with other methods, proposed method shows the best CM current suppression performance as well as the best efficiency characteristic.

The common-mode voltage (CMV) in voltage-source PWM inverters is harmful to motor drive systems. An enhanced space vector pulse width modulation (SVPWM) method based on the careful selection of intermediate vectors is proposed in this paper, aiming at the modulation range improvement whilst the CMV suppression in dual three-phase drive systems. The intermediate vectors are synthesized by large/small voltage vectors and a higher linear modulation range can be obtained compared with the existing method. The theoretical analysis and simulation results are presented to verify the proposed method.

Phase current is crucial for closed-loop control and system monitoring of a T-type three-level inverter (TThLI). However, the traditional space vector pulse width modulation (SVPWM) method cannot fully meet the minimum sampling time, which leads to the emergence of unobservable areas (UAs) in the neutral current sensor (NCS) phase current reconstruction system of TThLI. Moreover, the current zeropoint drift (ZPD) caused by temperature drift, aging, and noise affects the accuracy of NCS sampling. Regarding the issues above, this paper investigates the impact of UAs and ZPD on the NCS phase current reconstruction system and proposes an asymmetric SVPWM and error suppression (APES) phase current reconstruction method. The proposed method comprises two links: asymmetric SVPWM (ASVPWM) and ZPD error suppression. Firstly, the ASVPWM regulates the PWM waveforms according to composite zero vector and volt-second balancing principles and then generates three observable vectors whose dwell time is greater than the minimum sampling time to eliminate the UAs. Secondly, the ZPD errors are obtained and suppressed through the dynamic current triple sampling mechanism to improve reconstruction accuracy. Finally, experimental results show that the proposed APES method achieves an accuracy of 3.51% at the expense of a slight increase in total harmonic distortion.

The Four-switch Three-phase Inverter (FSTPI) based AC drive system has attracted much attention because it can decrease the total system cost and simplify the system topology. It can also realize a fault tolerant topology for a post-fault reconfiguration for the traditional Six-switch Three-phase Inverter (SSTPI). In this paper, the Field Oriented Control (FOC) of the Permanent Magnet Synchronous Motor (PMSM) fed by the FSTPI was studied. First, the space vector pulse width modulation method for FSTPI was discussed and three equivalent zero-vector methods were investigated. Second, the control principle of the PMSM-FOC system was discussed as well. Based on the above analysis, the control model for the system was simulated and the results indicate that the FSTPI-PMSM-FOC drive system can operate steadily and has satisfied dynamic torque feature.