DC Bus Current Sensed Space Vector Pulsewidth Modulation for Three-Phase Inverter

This article proposes an optimized space vector pulsewidth modulation (SVPWM) strategy with minimum common-mode voltage (CMV). Compared with earlier SVPWM methods, the proposed optimized strategy is implemented in the 45 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^\circ$</tex-math></inline-formula> coordinates. Locating the sector triangle, calculating the duty cycles, and determining the switching sequences require only basic arithmetic operations, which greatly reduces the computational complexity. The switching state with minimum CMV corresponding to the space vector can be calculated directly. The proposed optimized modulation strategy effectively solves the problem that the traditional SVPWM is difficult to be implemented as the number of levels increases. It can be easily extended to any level converters without additional computational burden. Based on the proposed optimized SVPWM strategy with minimum CMV, the SVPWM strategy for eliminating CMV is proposed. The proposed SVPWM strategy for eliminating CMV improves the utilization of the redundant cells and reduces the total harmonic distortion of phase voltages without increasing the difficulty of implementing the SVPWM algorithm. Finally, the proposed two SVPWM strategies are verified with extensive simulations and experiments.

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 main drawbacks of traditional finite set model predictive control are high computational load, large torque ripple, and variable switching frequency. A less complex deadbeat (DB) model predictive current control (MPCC) with improved space vector pulse-width modulation (SVPWM) under a single-phase open-circuit fault is proposed. The proposed method predicts the reference voltage vector in the α-β subspace by employing the deadbeat control principle on the machine predictive model; thus, the exhaustive exploration procedure is avoided to relieve the computational load. To perform the constant switching frequency operation and achieve better steady-state performance, a modified SVPWM strategy is developed with the same conventional structure, which modulates the reference voltage vector. This new approach is based on a redesigned and adjusted post-fault virtual voltage vector space distribution that eliminates the y-axis harmonic components in the x-y subspace and ensures the generation of symmetrical PWM pulses. Meanwhile, the combined merits of the DB, MPCC, and SVPWM methods are realized. To verify the effectiveness of the proposed control scheme, comparative experiments are performed on a five-phase permanent magnet synchronous motor (PMSM) drive system.

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.

A new instantaneous torque-control strategy is presented for high-performance control of a permanent magnet (PM) synchronous motor. In order to deal with the torque pulsating problem of a PM synchronous motor in a low-speed region, new torque estimation and control techniques are proposed. The linkage flux of a PM synchronous motor is estimated using a model reference adaptive system technique, and the developed torque is instantaneously controlled by the proposed torque controller combining a variable structure control (VSC) with a space-vector pulse-width modulation (PWM). The proposed control provides the advantage of reducing the torque pulsation caused by the nonsinusoidal flux distribution. This control strategy is applied to the high-torque PM synchronous motor drive system for direct-drive applications and implemented by using a software of the digital signal processor (DSP) TMS320C30. The simulations and experiments are carried out for this system, and the results demonstrate the effectiveness of the proposed control.

Presents an electric loading system without inertia disk for actuators that adopts a torque-loading structure with disc permanent magnet synchronous torque motor, which connects directly with the actuator under test, eliminating the inertia disk damping. It employs Wheatstone bridge circuit for measuring torque, and sticks strain gauges directly on the output shaft of the torque motor, removing the inertia of the torque sensor. Also, it establishes a model of disc permanent magnet synchronous torque motor, and uses the SVPWM (space vector pulse width modulation) method for the motor torque control. The simulation results of step response show that the system, without the need for bulky energy conversion device, realizes any transient current amplitude to control, through the use of sine wave current for driving, and reduces significantly the torque ripple, inhibits effectively the excess force in loading process. This electric loading system is simple in its structural design, and can improve model accuracy. Meanwhile, SVPWM vector control method improves the dynamic quality and control precision of the loading system.

Permanent magnet synchronous motor (PMSM) now is widely used in hybrid vehicle drive area. When the space vector pulse width modulation (SVPWM) is used in PMSM control, the stator three phase currents must be collected for its control calculation. In this paper, a PMSM stator current collection system based on C8051F500 and AD7865 is designed, and proved to be effective with experiments.

In this paper, a new model for a PMSM (permanent magnet synchronous motor) driver is proposed. The proposed model is envisioned as a better modulating drive current waveform. In the proposed system the modulating drive motor current waveform is more similar to ideal sinusoidal waveform. Advanced IGBTs and snubber circuits can be employed in the design of the driver to obtain high performance with a simultaneous reduction in THD (total harmonic distortion) and torque ripple of the motor. The proposed concept offers a significant decreasing for driver harmonics compared to classical SVPWM used. The inverter can be operated in 3-phase and 20 kHz switching frequency. A PMSM motor is operated at 3kW and 48V with the proposed model is evaluated via simulation with a corresponding SVPWM (space vector pulse width modulation) method. Results of torque ripple and THD of the motor currents on the model are discussed.

This research paper proposes a system to enhance quality of supply voltage from standalone PV system using simulation of photovoltaic array with inverter pulse generation topology using space vector pulse width modulation (SVPWM). Major focus of modulation technique is to get less voltage harmonic distortion, which is a performance index of best power quality. A perturb and observe MPPT technique is incorporated for maximizing output power of PV panel. Inverter is utilized in our framework accepting force supply from photovoltaic and switches of inverter are constrained by SVPWM method. Three closest vectors can be chosen effectively, exchanging arrangement and time determination using utilizing vector position in (SVPWM) technique. The simulation results show effectiveness of SVPWM based inverter. Supply quality indices voltage harmonic distortion factor (THD v ) is obtained as IEEE (519-1992) standard. Suggested system is implemented under MATLAB (2016(b)) simulation platform.

High-frequency signal injection methods have been widely used in sensorless control of permanent-magnet synchronous motor (PMSM) drives. However, the acoustic noise and torque ripples caused by the injected high-frequency signal limit the application of the methods. To avoid these drawbacks, this paper proposes a position estimation method that combines derivative calculations of current and zero-voltage-vector (ZVV) injection, which is especially effective for zero- and low-speed operation of sensorless PMSM drives. This investigation mainly focuses on the extraction of rotor position from ZVV period and the improvements of the accuracy of estimated position. The PMSM equation is developed in the stationary frame when ZVV is applied. The proposed d-axis current allocation scheme ensures the application of the proposed method from no load to rated load. A modified space vector pulse width modulation (SVPWM) control strategy and a ZVV extension scheme are employed to improve the accuracy of estimated position, which also makes the method more realizable. Further, a novel current sampling method that selects two suitable phase currents for derivative calculation according to the voltage sector location is proposed, which can help reduce current derivative ripples and decrease position estimation errors. Finally, the effectiveness of the proposed position estimation strategy is verified on a 1.0-kW interior PMSM (IPMSM) drive platform.

Permanent magnet synchronous motors (PMSMs) have dominated the motion control industry to the present, and, according to the current trend, there seems to be no end for it Induction motors have always been a minority in the motion control, and they are mainly used in applications, where the field weakening can be utilized to avoid the over-sizing of the drive, which would be the case with PMSMs. There is an increasing trend of using Space vector pulse width modulation (SVPWM) because of their easier digital realization and better dc bus utilization. In this paper both Sinusoidal PWM and space vector PWM feeding a PMSM motor are considered. These techniques are studied through simulation using MATLAB/SIMULENK software and the performance of both the techniques are compared. It is shown through simulation that Space vector PWM effectively utilize dc line voltage and generates reduced THD when compared with Sinusoidal PWM.

The development of electric and hybrid vehicles has gained increasing attention in recent years. This paper proposes an Electric drive for Hybrid vehicles application and its control strategy to achieve a wide speed range. In these vehicles, important requirements for the electric drive are low weight, small volume, high efficiency and low cost. When choosing the motor for the vehicle drive, the induction motor is an obvious alternative but a permanent magnet synchronous motor (PMSM) can offer advantages in terms of higher efficiency and specific power. In this paper a permanent magnet synchronous machine (PMSM) is used as an electric drive machine. The operation of a PMSM above the base speed is possible by weakening the permanent-magnet excitation by a demagnetizing field component supplied by the stator winding. This can be done by closed loop operation of PMSM. The speed and torque control of the PMSM drive used as hybrid vehicle is controlled by proper tuning the PI controllers. A three level diode clamped inverter using IGBT's has simulated, whose switching sequences are controlled by Space Vector Pulse Width Modulation (SVPWM). A mathematical model of PMSM drive suitable for hybrid vehicle has simulated and proper closed loop control is established by field oriented control method. The entire work is done in MATLAB/SIMULINK.

Permanent magnet synchronous motor (PMSM) is the most widely used motor in electric vehicles (EV) due to its high power density and high efficiency. Conventional direct torque control (DTC) is developed to improve the performance of speed response of the PMSM drive but it suffers from higher torque ripples. Therefore a space vector modulation (SVM) based DTC has been developed to enhance the speed response. Due to the use of flux comparator and torque comparator conventional DTC has disadvantages such as higher torque and current ripples at steady state. To improve the performance of PMSM drive a space vector pulse width modulation is used with 3 level NPCI. To improve the performance of 2 level inverter in the PMSM drive is replaced with a neutral point clamped inverter (NPCI). Also, the switching selection strategy of SVM is modified using nearest three space vector pulse width modulation to reduce the total harmonic distortion (THD) in the inverter output. The simulation outcome proves that the SVM technique implementation in DTC for 3 level NPCI yields good performance for PMSM.KeywordsElectric vehicles (EV),voltage source inverter (VSI)Direct torque control (DTC)Neutral point clamped inverter (NPCI)Permanent magnet synchronous motor (PMSM)Space vector modulation (SVM)Total harmonic distortion (THD)

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.

One of the popular AC motor drive available in drive industry is permanent magnet synchronous motor (PMSM) drive. A novel approach of PMSM drive control using space vector pulse width modulation (SVPWM) technique is proposed based on the principle of field oriented control (vector control). In MATLAB / Simulink platform the whole system is implemented in which two control loops are used-inner current loop and outer speed loop. Beside continuous-time control, digital control using shift operator and delta operator is also presented. It is shown that the delta operator control scheme provides a unified frame-work and converges to the continuous-time control at high sampling frequency. However, the shift operator based control scheme does not leads to satisfactory result as the sampling speed increases. Simulation results verified the above facts.