Vector Control System Research Articles

Research on Permanent Magnet Synchronous Motor Drive System of Electric Vehicle Based on Fuzzy Control

The performance of permanent magnet synchronous motor is an important indicator to measure the performance of motor. Since the conventional PID control is only applicable to the linear control system, the conventional PID control cannot satisfy the control performance requirements for a nonlinear control system such as a permanent magnet synchronous motor or a time-varying system. Fuzzy control does not depend on the precise mathematical model of the controlled object, and it has strong robustness and anti-interference ability to the changes of the controlled object parameters. In this paper, the traditional PID control and fuzzy control are combined, and the PID parameters are adjusted online by the fuzzy controller, so that the permanent magnet synchronous motor speed regulation system has good dynamic and static characteristics. In this paper, MATLAB is used to model and simulate the permanent magnet synchronous motor vector control system based on fuzzy control. The results show that the fuzzy controller has excellent performance in suppressing the overshoot and anti-disturbance.

Vector control strategies to enable equal frequency operation of the modular multilevel matrix converter

The Modular Multilevel Matrix Converter (M3C) is an ac-to-ac converter suitable for high-power applications. The control of this converter is complex, mainly when the frequencies of the ac systems connected to the ports of the converter are close or equal, because the floating capacitors can present large voltage oscillations. Therefore, this paper proposes a new Vector Control System to enable the operation of the M3C when the input-output frequencies are equal. The effectiveness of the proposal is validated through simulations and experimental results conducted with a 27 power-cell prototype.

Sensorless Control of Permanent Magnet Bearingless Synchronous Motors Using Online Parameter Identification

A novel rotor position estimation scheme using online parameter identification based on grey model is suggested in this paper, which will meet the need of sensorless control for permanent magnetism bearingless synchronous motor (PMBSM). The scheme is computationally simple and does not rely on the motor parameters. And then, the sensorless vector control system of PMBSM is set up based on this position estimation approach. The results of simulation and experiments show that the proposed method is capable of precisely estimating the rotor space position and is able to achieve stable suspension under the bigger disturbance.

RESEARCH OF ASYNCHRONOUS ELECTRIC DRIVE, OPTIMIZED ACCORDING TO THE CRITERION OF MAXIMIZING TORQUE-PER-AMP

In the article the research of the work of the asynchronous electric drive on the basis of the autonomous voltage inverter with the vector control system and the AD-906U engine in the modes of its full and partial use by power on a mathematical model is software environment the MATLAB. It is shown that the characteristic |ψ R |=f(P dc ) significantly affects the nature of the transition process of an asynchronous electric drive when operating at powers below nominal. Such modes are characteristic of a traction drive of an autonomous electric transport. To increase the efficiency of an asynchronous electric drive of an autonomous electric transport, it is proposed to optimize its control system according to the criterion of maximizing Torque-per-Amp relationship taking into account the characteristic |ψ R |=f(P dc ). The quantitative estimation of the deviation of the engine power factor ratio when the power consumption is changed is given. Thus, at 25% of the motor power from the nominal, optimization by the criterion of maximizing Torque-per-Amp, taking into account the characteristic |ψ R |=f(P dc ), allows increasing the power factor by 14% than the non-optimized asynchronous electric drive under similar conditions. When an asynchronous electric drive is operated at a power close to the nominal, optimization by the criterion of maximizing Torque-per-Amp does not significantly affect the value of the power factor, but it allows to increasing the electromagnetic torque of the motor in starting. The proposed optimization method can be applied to traction asynchronous electric drives, as well as to auxiliary drives of autonomous locomotives. This will improve the energy efficiency of the traction asynchronous electric drive of the autonomous rolling stock and reduce the cost of fuel and lubricants.

Thrust Control Systems of Propulsion and their Verification on Dynamically Positioned Vessels

Abstract Thrust vector control systems of propulsion systems of dynamic positioning vessels are commonly applied on vessels with DP2 and DP3 class of DP. It was submitted the ways of providing information to dynamic positioning operator DPO about detecting of suspicion of failure in specific thruster and shown the ways of response in such situations. In the case of failure and shut down one of working thrusters, it must be done the possibility assessment of continuation of DP system safe operation. If such situation is not possible, it should be considered the work of DP system on limitations. It was indicated on safety threats during operation of DP systems resulting from system failure or even the design faults. It commonly applies the failure mode and effect analysis (FMEA or FMECA) from the design phase through sea trials until to the verification process during operation. It allows the elimination of majority of faults in the DP systems. It was communicated the basic conditions of safe operation of vessels with DP systems and the examples of conditions which releasing the readiness signal of DP propulsion system elements. Observed development of control and automatics systems will result in increasing the safety of DP systems operation.

Experimental Investigation on Stator Impedance Affected by Magnetic Saturation and Rotor Slot used for Sensor-less IM Vector Control System with High-frequency Voltage Signal Injection

Experimental Investigation on Stator Impedance Affected by Magnetic Saturation and Rotor Slot used for Sensor-less IM Vector Control System with High-frequency Voltage Signal Injection

Test platform for a torque vectoring control system for in-wheel motor driven vehicles

Test platform for a torque vectoring control system for in-wheel motor driven vehicles

ASYNCHRONOUS GATE CASCADE WITH ORIENTED TO VECTOR CURRENT OF MAGNETIZATION CONTROL SYSTEM

In the paper, closed control system of the asynchronous gate cascade (AGC) in axes of coordinates oriented on the magnetization current vector, which is defined as the geometric sum of stator and rotor vectors, is developed and investigated. The search coordinates axes and the optimal structure of the mathematical model of AGC for achieving the best value of a given quality criterion can not be formalized. Therefore, the definition of the structure of the mathematical model of AGC and the synthesis on its basis of the control system, which ensures the qualitative regulation of the electromagnetic torque, have no unam-biguous solution. The paper describes the main stages of the construction of the AGC control system, which is oriented on the magnetization current vector, provided that the structure and parameters of the automated model AGC as a control object are known. The greatest attention is paid to the identification of the reference vector and the study of the dynamic modes of operation AGC with the proposed system of vector control by the method of mathematical modeling. The identification of the stator and rotor currents, and hence the magnetization current, is technically simpler than identifying the asynchronous machine's magnetic fields. The paper proposes to change the structure of the channel of reactive power and its control system in comparison with the most common control system AGC, which is oriented by the vector of the stator flux linkage. Using the vector control system of AGC with the chosen reference vector and the developed structure allows qualitatively to control the magnetization current module and, consequently, the electromagnetic torque that increases the dynamic characteristics of the AGC in comparison with known control systems and approximates the AGC at the regulatory capabilities to direct current electric drives

Speed Sensorless Vector Control Based on Full-order Adaptive Observer for Induction Motor Drives at Low Speed

This paper presented a speed sensorless vector control method based on adaptive full-order state observer for induction motor. The rotor speed estimated by an adaptive full-order observer is fed back to the vector control system as a feedback signal to form a closed-loop control of speed. In addition, the stator resistance is also recognized and updated in real time, so the effect of change of stator resistance on accuracy of speed estimation can be eliminated. The parameter identification system is achieved according to the Popov’s hyperstability theory, therefore the system is stable enough even at very low speed. The simulation and experimental results illustrated the correctness and effectiveness of the presented control algorithm.

Sensorless vector control of a permanent magnet synchronous motor

The most common control system for a synchronous motor with permanent magnets is a vector control system. The construction of such a system has a number of difficulties, one of them is the need to have information about the current position of the rotor. Data on the position of the rotor can be obtained using sensors, or include a supervisor in the control system. The article describes an adaptive observer of the position and speed of the rotor of a synchronous motor with permanent magnets. This observer is used in the system of sensorless vector control of the electric drive. The presented version of the observer of the engine state is realized by creating a model in the Matlab Simulink software package. The results of experimental verification of the presented observer at the stand with the use of an engine with a power of 200 W are shown. The aim of the work is to develop an observer that is stable to changing drive parameters. This is achieved by using a relay unit in the view of the observer, which implements the slip mode.

Design of Low-Cost BLAC Motors for Integrated Electric Brake Systems

During motor production processes, the influence of motor manufacturing tooling costs on motor prices is mostly negligible and considered to be insignificant. The manufacturing cost, particularly the molding cost, may not be a significant issue for mass production, but it would become a crucial issue for modern small-scale application-oriented design. When the total number of motors produced per motor manufacturing tool such as stator and rotor pressing tool is reduced, the effect of the motor manufacturing tool cost on the motor price can be greatly increased. To reduce the cost, we present a new design approach of a brushless AC (BLAC) motor that shares motor manufacturing tools, unlike many previous studies on low-cost designs. The design approach of a BLAC motor is applied to integrated electric brake (IEB) systems of various specifications. In addition, to analyze the motor performances in IEB systems, the BLAC vector control system, FEM, design of experiment, and moving least square method are used. Furthermore, to predict the available operating time of a motor, a heat compensation coefficient that uses the experimental data of an existing motor is proposed. By implementing this design approach, we have effectively designed motors that satisfy performance requirements such as speed response, available operating time, and total harmonics distortion (THD) of back EMF with minimum stator core volume, in the IEB systems, and achieve a 25.5% reduction in cost through sharing of motor manufacturing tools.

Энергосберегающий электропривод для стенда испытаний тракторных шин

The article addresses matters concerned with designing the tractor tire test bench with taking into account the shortcomings of its previous designs and considers the possibility of performing tractor tire tests with better energy efficiency and reliability. The existing domestic and foreign test benches are analyzed. The test bench electric drive power part’s functional diagram is proposed along with the power flows and power loss distribution diagram in the bench drives for estimating their power performance characteristics. From the technical point of view, the aim of the development is to reduce the electricity consumption. To this end, the bench is equipped with two additional electric machines operating in regenerative braking modes, thereby ensuring return of energy back to the network (an individual loading induction motor is provided for each tire). The article describes the bench design, its technical characteristics, requirements for the bench control system, and the technical solution that allows more efficient tire test results to be obtained due to returning energy back to the network and due to the fact that the drive power is now spent only to compensate losses in the bench mechanisms. A vector control system of interconnected electric drives used in the bench is mathematically modeled, and its technical capabilities are investigated. The effectiveness of the proposed solution is proved based on estimating the energy return level to the drive power supply grid.

Torque Vectoring for an Electric All-wheel Drive Vehicle

This paper deals with vehicle dynamics control of an all-wheel drive vehicle. The aim is to design a torque vectoring control system with yaw moment control. Based on theoretical background of basic vehicle drive processes and possible ways of vehicle dynamics control, the control system structure is designed, followed by simulations in Matlab connected to the virtual simulation software CarMaker. Then the control system is ready for implementation into the electronic control unit of formula student type vehicle SGT-FE18, designed and developed by the student team STUBA Green Team.

Robust Model-Free Nonsingular Terminal Sliding Mode Control for PMSM Demagnetization Fault

In this paper, a robust model-free nonsingular terminal sliding-mode control (MFNTSMC) algorithm based on the ultra-local model is proposed to reduce the influence of permanent magnet (PM) demagnetization for PM synchronous motors (PMSMs). First, the PMSM mathematical model in normal and demagnetization is described, and the ultra-local model of speed loop and current loop is constructed based on the input and the output of the PMSM vector control system. Then, the MFNTSMC method is proposed and adopted to design the speed controller and d-q -axis current controller, and the sliding-mode observer is designed to estimate the unknown terms of the ultra-local model. Finally, compared with the PI control method and model-free control method, the results of simulations and experimentations show that the MFNTSMC method can improve the dynamic response while maintaining robustness of PMSM driven system, reduce the dependence of the design of controller on the precise PMSM model, and has fault-tolerant control function for PM demagnetization fault.

Application of seven-level neural space vector PWM in direct vector control system of doubly fed induction generator for wind turbine

This paper presents the direct vector control (DVC) technique of doubly fed induction generator (DFIG) with the application of seven-level neural space vector pulse width modulation (7L-NSVPWM). The mathematical model of the DFIG has been described. The descriptions of the 7L-SVPWM technique and neural networks (NNs) have been presented. The DVC control scheme with 7L-NSVPWM technique has been described. The simulation results of the DVC control with 7L-NSVPWM strategy have been performed, and the results of these simulations are presented and discussed.

The Design of Control System for Gearless Synchronous Drum-Motor of the Underground Mine Belt Conveyor

Regarding the current tendency of replacing the geared electric drives with gearless drum motor and substitution of the obsolete induction motors with energy-efficient synchronous motors, the authors consider the difficulties of the high-power permanent magnet synchronous motor and present its model with parameters corresponding to the real belt conveyor electric drive parameters. This paper describes the questions of the vector control system simulation for the synchronous gearless drum-motor of an underground belt conveyor. The control of permanent magnet synchronous motor is realized having regard to rotor angle and random traffic flow. The mechanical system of an underground belt conveyor is represented by the multimass system with the viscoelastic bar. As a conclusion, the article presents the results of the direct torque control system simulation in the speed adjustment mode.

Current Distribution Method of Induction Motor for Electric Vehicle in Whole Speed Range Based on Gaussian Process

A current distribution method based on Gaussian process is proposed in this paper. This method can improve the accuracy of current distribution of induction motors for electric vehicles in whole speed range, and achieve high-performance output torque. First, a vector control system based on current distribution model is designed based on control requirement analysis of induction motor. Second, the mathematical model of output torque and current is established. And the current distribution law of the optimal electromagnetic torque under various operating conditions is qualitatively analyzed. Third, the experimental platform is built to obtain the discrete data of current distribution in whole speed range and the rotor time constants at different temperatures. Finally, the Gaussian process is introduced to establish the regression model based on current discrete data. The regression model distributes the current reasonably and accurately, which is embedded in the control system. Experimental results verify the effectiveness of the proposed method.

Goals and Problems of Improving of Electromechanical Control System of SHBM-150M Type Balanced Manipulator

The movement of different objects in area is main part of most operations. Often that movements are performed by various types of balanced manipulators. The analysis of a Russian manipulator of ShBM-150M type was completed, the specifics design and applied sensorless vector control system of induction motor are considered. The disadvantageous of manipulator work due to the current control system are detected. The factors of low position precision of cargo at fixation on tags are determined. The elastic vibrations of the manipulator mechanical part, which adversely affect for its work quality, have been experimentally identified and researched. The design model of multi-mass mechanical system is presented. The improvement goals of the control system of ShBM-150M manipulator are defined for upgrade of technical parameters, ease of operation and functional capability.

Research on Deadbeat Current Prediction Vector Control System of Axial Flux Permanent Magnet Synchronous Motor for Electric Bus Based on Efficiency Optimal Torque Distribution Method

In order to improve the cruising range of electric bus, this paper studies the deadbeat current prediction vector control system of axial flux permanent magnet synchronous motor (AFPMSM) for electric bus based on the optimal torque distribution method. Firstly, the mathematical model of the three stators-double rotors AFPMSM is established. Secondly, in order to improve the high efficiency range, the efficiency optimal torque distribution method is proposed based on the average torque distribution method and the back propagation (BP) neural network is used to find the optimal torque distribution method. Then a current control strategy based on deadbeat current prediction control is proposed to improve the torque tracking characteristics. Finally, a drive control system is developed for the proposed control strategy, and experimental research and vehicle testing are carried out. The experimental results show that the BP neural network-based torque distribution method designed in this paper increases the high efficiency range of the drive system and improves the cruising range of the electric bus. The drive system using a current controller based on deadbeat current prediction control exhibits good dynamic and steady state performance.

Разработка структурной схемы бифункциональной системы управления вектором тяги ракетного двигателя

Разработка структурной схемы бифункциональной системы управления вектором тяги ракетного двигателя