Space Vector Control Research Articles

Research on AC Servo Motor Load Disturbance Method

For the decline of the control accuracy of servo system due to the disturbances of load, to design the dimensionality reduction load torque observer, the observed value of load torque after conversion for compensation control. Established the three- loop mathematical model of servo control system, to elicit three- loop control parameter setting formula by the application of optimal second order and third order model theory. Established the simulation model of space vector control AC servo system, by simulation experiment it is verified that three-ring parameters can provide good dynamic performance for system after setting. After the establishment of experimental platform, through the motor load sudden change experiment, it proved the feasibility of the torque compensation control for improving the servo system control precision under load disturbances.

Comparative Analysis of Two Level VSI and Three Level Neutral Point Clamped Inverter for Torque Ripple Reduction in Induction Drive

This paper presents the comparative analysis of various level of multilevel inverter for induction motor torque ripple minimization. The neutralpoint clamped (NPC) inverter is used an adequate solution in AC drives application. The Conventional inverters compared to multilevel inverters have many limitations in high-voltage and high-power applications like poor power quality, high voltage stress, EMI/EMC issue etc. Also proposed the Space Vector neutral point clamped inverter for Torque ripple reduction in induction drive. The Simple Space vector control scheme is applied to neutral point clamped inverter by reference torque estimation. In this proposed topology offer an improved performance in the form of torque ripple reduction scheme. The Classical direct torque control of two-level VSI scheme is compared with proposed three-level NPC scheme. The main aim of this paper to provide a significant method and control scheme to obtained torque ripple reduction in induction motor Drive. The result shows the performance of neutral point clamped inverter using CB-PWM on induction drive. In this paper three levels VSI based Neutral Point Clamped (NPC) multilevel inverter fed induction motor drive is simulated, analyzed and compared with two levels VSI based NPC inverter drives. Torque of the motor is controlled by using space vector based direct torque control (DTC) method. The simulation results are carried out by using MATLAB/SIMULAINK environment.

Efficient speed control of induction motor using RBF based model reference adaptive control method

This paper proposes a model reference adaptive speed controller based on artificial neural network for induction motor drives. The performance of traditional feedback controllers has been insufficient in speed control of induction motors due to nonlinear structure of the system, changing environmental conditions, and disturbance input effects. A successful speed control of induction motor requires a nonlinear control system. On the other hand, in recent years, it has been demonstrated that artificial intelligence based control methods were much more successful in the nonlinear system control applications. In this work, it has been developed an intelligent controller for induction motor speed control with combination of radial basis function type neural network (RBF) and model reference adaptive control (MRAC) strategy. RBF is utilized to adaptively compensate the unknown nonlinearity in the control system. The indirect field-oriented control (IFOC) technique and space vector pulse width modulation (SVPWM) methods which are widespread used in high performance induction motor drives has been preferred for drive method. In order to demonstrate the reliability of the control technique, the proposed adaptive controller has been tested under different operating conditions and compared performance of conventional PI controller. The results show that the proposed controller has got a clear superiority to the conventional linear controllers.

Assessment of performance with the Comparision of Asymmetrical Cascaded and Reduced Switch Multilevel Inverter of Space Vector Control Modulation

Assessment of performance with the Comparision of Asymmetrical Cascaded and Reduced Switch Multilevel Inverter of Space Vector Control Modulation

Comparison of Different PWM Techniques in T-Source Inverter

This paper deals with the analysis of three phase Tsource inverter by using different control techniques to minimize the switching losses. T-source impedance network is developed to overcome the drawbacks of Z-source inverter. TSource inverter has low reactive components in comparing with ZSI. The Total harmonic distortion (THD) of output voltage for both the control methods has been analyzed by using FFT analysis. The maximum constant boost pulse width modulation (PWM) control method has more voltage gain and less voltage stress compared to other techniques. The experiments are done and the results are shown for capacitor voltage, load current and load line voltage for simple boost, constant boost control technique and space vector modulation PWM techniques are presented using MATLAB/Simulink.

Study and Realization of SVPWM Algorithm’s Key Technology

Control algorithm is the core of AC servo system. In order to improve the performance of system, on the basis of vector control system and space vector pulse width modulation (SVPWM), inverse matrix and projection of out U on plane rectangular coordinate system were used to determine the nonzero vector movement time 2 1 t t、 . Then, a calcula- tion method of vector switch point T cm1 ,T cm2 ,T cm3 was given. Finally, a judgment method of sector which vector locate was given based on the one-to-one relationship between index number and sector. Simulation was carried on and some simulation results show that the system has good dynamic response and steady-state accuracy.

Control of the reactive power supplied by a WECS based on an induction generator fed by a matrix converter

This paper introduces an integrated energy storage and reactive power compensation in a large wind power plant, and it deals to regulate the reactive power supplied by a variable-speed Wind Energy Conversion System (WECS), based on an induction generator fed by a Matrix Converter (MC). The control strategy used in this paper is input current observer, implemented using an estimation of the modulation index, and a nonlinear control loop that regulates the displacement angle at the matrix converter input. This paper is described the implemention of the matrix converter to control the reactive power by using the Space Vector Pulse Width Modulation (SVPWM) technique in large wind farms and combining them into one system to maintain stability control of the wind power plant. Control of reactive power increases the regulating capacity, which can provide voltage stability in the wind farm. In this work, Matlab/Simulink TM model and simulation of the three phase matrix converter have been performed using the space vector control algorithm. The algorithm uses a simpler method than the other control algorithms to control the input power factor. To verify the performance of the proposed Matrix Converter, modulation strategy, and control design methodology, various simulation results are presented.

Generalized space vector controls for MLZSI

Abstract This paper proposes two advanced algorithms for multilevel Z-source inverter (MLZSI), which employ space vector control (SVC) as control algorithm of cascaded H-bridge multilevel Z-source inverter; where output voltage is achieved by summing the output voltages of bridge. In these algorithms different states to generate the same voltage with low THD, as the purpose, are verified and the suitable one is selected. This method is simple and has appropriate performance, where sample time is set quietly. Use of Z-network allows the inverter to generate a wide range of output voltage with high reliability. The accuracy of suggested algorithms is validated with simulation results using MATLAB/SIMULINK software and experimental results based PCI-1716 data acquisition system.

A Fault-Tolerant Control Strategy for Six-Phase Transverse Flux Tubular PMLM Based on Synthetic Vector Method

The six-phase transverse flux tubular permanent magnet linear motor (PMLM) has many advantages compared with conventional linear motors. However, the reliability of its drive system can still be influenced by power converter or machine faults. This paper presents a fault-tolerant control strategy for six-phase transverse flux tubular PMLM based on synthetic vector method when the machine has a single-phase open-circuit fault. The operation of six-phase transverse flux tubular PMLM is described as well as its basic mathematical model. Then, the principles of synthetic vector method are introduced. Based on these theories, the fault-tolerant control strategy is derived in detail under the single-phase open-fault condition. In addition, a fault-tolerant dual three-phase four-leg inverter's drive topology that can be applied under this faulted condition is proposed. Moreover, to implement the control algorithms proposed, a modified space vector modulation is presented. Both the finite-element simulation and MATLAB/Simulink simulation results illustrate the validity of the proposed fault-tolerant control as well as the associated control topology and space vector modulation.

Space Vector Control of Permanent Magnet Synchronous Motor Based on 60<sup>o</sup> Coordinate System

Permanent magnet synchronous motor mathematical models of synchronous rotating coordinate system are decoupled by rotor field orientation. Then, the speed regulator, current regulator and space vector control system are designed. The current inner ring and speed outer ring ensure the accurate tracking of current and the accurate control of speed. To reduce the control algorithm computation, SVPWM control strategy based on the 60o coordinate system is used on the permanent magnet synchronous motor control system. Simulation results show that the space vector control system has good dynamic characteristics and the control scheme is feasible.

Direct torque controlled space vector modulated method for line start permanent magnet synchronous and induction motors

This paper presents a thorough comparison of Direct Torque Controlled Space Vector Modulated (DTC-SVM) method for a three-phase four-pole Induction Motor and its equal Line-Start Permanent Magnet Synchronous Motor (LSPMSM), which is amended from an actual induction motor. For this reason, both nominal voltage and voltage sag conditions are tested for line-fed and voltage source inverter-fed of both motors, and a comparison between induction motor and LSPMSM behavior shows that synchronization problems of LSPMSM during line-fed conditions are obviated by DTC-SVM method. In addition, a superior transient and steady-state performance of the LSPMSM drive is observed rather than an induction motor, especially for voltage sag conditions.

A Novel Multilevel Inverter Using Vector Control Method

In this paper a novel space vector control method is proposed here. It can be used in the multi level inverter consists of low frequency transformers. The proposed method is entirely based on the programming way and is different with the conventional method. It has the following advantages: similar response time with the conventional method and flexible expansion.

Research on the Control of AFE Converter

In this paper, a strategy of AFE converter based on direct power control is presented. The AFE converter possesses the merit of sinusoidal current on grid-side, controllable power factor and constant DC voltage, meanwhile, power feedback to the grid can be realized. Firstly, a power control mathematical model of AFE converter in two-phase synchronous rotating coordinate is built, on this basis, adopts the square of voltage control in the outer control loop and limits the slope of the setting voltage to improve the starting performance; then uses power feedforward decoupling control in inner control loop , combines with the instantaneous power theory and uses space vector control algorithm to replace the switch table to solve the problem that switching frequency is not fixed in traditional direct power control. Ultimately realizes the independent control of active and reactive power without decoupling. The experimental results verify the correctness and validity of the proposed control strategy.

Speed Tracking of Field Oriented Control Permanent Magnet Synchronous Motor Using Neural Network

The field oriented control theory and space vector pulse width modulation technique make a permanent magnet synchronous motor can achieve the performance as well as a DC motor. However, due to the nonlinearity of the permanent magnet synchronous motor drive characteristics, it is difficult to control by using conventional proportional-integral-derivative controller. By this reason in this paper an online neural network controller for the permanent magnet synchronous motor is proposed. The controller is designed to tracks variations of speed references and also during load disturbance. The effectiveness of the proposed method is verified by develop simulation model in MATLAB-simulink program. The simulation results show that the proposed controller can reduce the overshoot, settling time and rise time. It can be concluded that the performance of the controller is improved.

Motor Control System Based on DSP Four-Bridge Arm Topology

This paper proposes a space vector motor control system based on DSP four-legged bridge topology A three-dimensional space vector control principle based on four-bridge arm three-phase inverter is introduced with a MATLAB model using space vector Motor Control Algorithm instead of traditional Motor Control method. A DSP experimental setup is also carried out to verify the control theory and simulation result. The experiment and simulation results show that the speed control system helps the asynchronous motor to achieve the consistent response characteristics with separately excited DC machine. When the motor doesn't work or the load is unstable, asynchronous motor can still achieve excellent electrical characteristics with the proposed speed control system, such as quick start, small overshoot and static torque ripple.

V2G Technology for Electric Vehicles

V2G technology is an important part of the smart grid,which realizes the power inter-transformation between Power Grid and electric vehicles [1]. V2G technology is introduced and the structure of charging and discharging system in V2G technology is analyzed [2]. Under synchronous rotating frame, the combination current-controlled and Voltage space vector control method is adopted, which carries out the power inter-transformation between Power Grid and electric vehicles [3].

Extended switching algorithms based space vector control for five‐level quasi‐ Z ‐source inverter with coupled inductors

This study combines quasi-Z-source into the five-level inverter using coupled inductors. The suggested circuit consists of only one dc voltage source, one quasi-Z-network, six power switches and only one set of coupled inductors. In this topology, the output voltage amplitude is not limited to dc voltage source and it is reliable and higher efficiency because of quasi-Z-network presence. This study also proposes new switching algorithms for the inverter based on pulse width modulation (PWM) and space vector control (SVC) algorithms, which cause boosting capability of output voltage with low total harmonic distortion (THD). This PWM algorithm is particular one, which calculates dwelling time for each switch in every sample time. The proposed SVC algorithm generates a voltage vector with very low harmonic distortion and reduced switching frequency. The performance of proposed inverter and switching algorithm are validated with simulation results using MATLAB/SIMULINK software and experimental results based PCI-1716 data acquisition system. These results demonstrate the proposed inverter with suggested algorithm can generate a wide range of load voltage.

Application of Backstepping to the Virtual Flux Direct Power Control of Five-Level Three-Phase Shunt Active Power Filter

This paper proposes a virtual flux direct power control-space vector modulation combined with backstepping control for three-phase five-level neutral point clamped shunt active power filter. The main goal of the proposed active filtering system is to eliminate the unwanted harmonics and compensate fundamental reactive power drawn from the nonlinear loads. In this study, the voltage-balancing control of four split dc capacitors of the five-level active filter is achieved using five-level space vector modulation with balancing strategy based on the effective use of the redundant switching states of the inverter voltage vectors. The obtained results showed that, the proposed multilevel shunt active power filter with backstepping control can produce a sinusoidal supply current with low harmonic distortion and in phase with the line voltage. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5621

Modeling and Simulating of PMSM Space Vector PWM Drive System Based on Fuzzy Immune PI Control Method

In order to improve the speed control performance of the PMSM(Permanent magnet synchronous motor) vector control system. Utilizing the mathematical model of the PMSM in the dq0 coordinates, and the basic principles of the SVPWM (Space Vector Pulse Width Modulation) control method, a simulation model of the PMSM Space Vector Control System, which contains the double loop of speed and current, has been constructed based on the MATLAB/SIMULINK simulation environment. According to the artificial immune feedback theory and the approximation of the nonlinear function in the immune feedback system, with the help of fuzzy logic, a fuzzy immune PI controller has been made and harnessed in the speed loop. Under the three conditions: steady load startup, speed abrupt change, and load abrupt change, a series of contradistinctive simulation experiments are conducted and compared with the original PI controller respectively. The experimental results showed that the SVPWM control method with the fuzzy immune PI controller can not only make the motor run steadily, but also give it a superior speed performance and torque control characteristics. In addition, the control performance of the fuzzy immune PI controller showed a dramatically improvement compared with that of the traditional PI controller.

Application of Simplified Neutral Point Clamped Multilevel Converter in a Small Wind Turbine

Abstract In low power distributed generation systems low cost together with the energy quality requirements are a key element. It is known that quality of voltage waveforms generated from multilevel converters is better in comparison with those from two-level. Due to advancements in power electronics and microcontrollers, multilevel converters are being built with the use of integrated power modules thus this type of converters are getting more compact in size. This paper investigates performance of a derivation from the most popular multilevel topology - a neutral point clamped converter (NPC). Applying the idea for simplifying the topology by reducing the number of switches (what came from drives) this NPC converter is capable of bidirectional AC/DC/AC operation. For the AC/DC part two schemes are tested: Direct Torque Control Space Vector Modulated and Field Oriented Control but for the DC/AC part a control scheme utilizing the proportional-resonant controller was chosen. Laboratory setup was based on a permanent magnet synchronous generator with control and acquisition completed with the help of dSpace 1005 control box. Experimental verification shows that system operates properly.