Abstract

Abstract: Considering model parameter imbalance and one-step lag, an revised Deadbeat Predictive Current Control (DPCC) is proposed in this work. It improves the performance of current control of Permanent Magnet Synchronous Motor (PMSM). By improving the current control, losses in the machine can be reduced and machine performance can be improved. For doing this, traditional predictive current control performance is analyzed. Based on sliding mode exponential reaching law, a stator current and disturbance observer (SCDO) is being proposed. SCDO can concurrently forecast future value of stator value of stator current and track system disturbance caused by parameter imbalance. For compensating the voltage reference calculated by deadbeat predictive current controller, a feed forward value is considered. This feed forward value is the prediction currents based on SCDO. These are used for replacing the fragmented current in DPCC. By connecting the DPCC part and current forecasting and feed forward rectification part based on SCDO, a compound control method is developed in this work. This paper focuses an adaptive SCDO based on novel adaptive sliding mode reaching law which can increase the control performance of the existing method. This method can be used for Electric Vehicle (EV) control.

Keywords: Observer, Parameter mismatch, Permanent Magnet Synchronous Motor (PMSM), Predictive Control, Deadbeat Predictive Control.

Abstract: Permanent Magnet Synchronous Motors (PMSM) are widely used in low and mid power applications such as computer peripheral equipment, robotics, adjustable speed drives and electric vehicles. The growth in the market of Permanent Magnet motor drives has demanded the need of simulation tools capable of handling motor drive simulations. Simulations have helped the process of developing new systems including motor drives, by reducing cost and time. In a closed loop system the speed of a Permanent Magnet Synchronous Motor can be controlled by measuring the actual speed of the motor. PI (Proportional Integral),PID (Proportional Integral Derivative) and Fuzzy controllers are commonly used for the speed control. In this paper the speed responses of a PMSM is obtained using adaptive fuzzy PID controller. A parallel combination of two controllers- fuzzy PD controller and a fuzzy PI controller forms the adaptive fuzzy PID controller. Switching action take place between the two controllers based on the error in the speed. MATLAB/Simulink is used for the simulation. A comparison and analysis is made between PI controller and adaptive fuzzy logic controller. 

Keywords: Permanent Magnet Synchronous Motor (PMSM), PI Controller, Adaptive fuzzy, speed control.

Abstract: Nowadays, model predictive based torque control is arise as one of the powerful control technique for the IM drives. The fast response and accuracy is the main features of predictive torque control technique. The control technique includes the predictive controller to obtain better dynamic response and PI controller to attain better steady state response. The main characteristics of PTC is by using the machine model for determining the future performance of the variables which is to be controlled. In MPTC scheme, the command signals are indicated as cost function, which is to be reduced. It has increased resilience to use constraints that gives low computational complexity compared to simple vector controlled schemes. PTC offers increased dynamic behaviour and improved speed responses. A modified MPTC is sugested for the control of the torque ripple minimization. A portion of time interval is given to the non zero voltage vector, while the remaining time is given for a zero vector. The minimisation of torque ripple concept help to know the time period for individual vectors. The proposed method proves that it gives excellent steady state response by the reduction of the torque ripples.

Keywords: Direct torque controls, induction motors, predictive torque controls.

Abstract: Solar power used is the best alternatives. It produces electrical energy which is low cost and efficient, used in pumping application which is simple, robust.  The innovation of the work is to implement Perturb and observe algorithm based Maximum Power Point Tracker (MPPT) to boost the systems capability.  A PV array is proposed for extracting power and in between the SRM drive and PV array a zeta converter is provided for continuous operation of MPPT thereby shrinking the amount of sudden current flow to the system. An SRM uses a spilt phase capacitor drive for providing the required voltage pulses for phase windings excitation in all of the four phases in SRM. A zeta converter is also proposed as it does not need any additional circuit to limit the sudden flow of current to the system. The SRM drive is controlled with variable DC link voltage of spilt phase converter and it depends upon the different environmental conditions and irradiance level of SPV array. The obtained results have shown that the efficiency of the proposed system is better at higher irradiance levels.

Keywords: Maximum Power Point Tracking (MPPT), Perturb and Observe (P&O), Switched Reluctance Motor(SRM), Zeta converter

Abstract: A Switched Reluctance Motor (SRM) drive has wide benefits such as high torque-volume ratio, low manufacturing cost, high dynamic response and wide speed range is required. Many industrial and home appliances have devices of power automatic recycled as a rectifier and driver along with motors. The use of these devices have several non-linearity in the electrical system. Some problems are high harmonics, low power factor, reduced performance and increased consumer cost has produced as a result of non-linearity. In a conventional switched reluctance motor drive, the AC mains power factor is low and the overall Total Harmonic Distortion (THD) rises as a result of harmonics. In instruction to diminish the THD and progress the power factor of the supply mains of SRM, a Bridgeless canonical switching cell (CSC) converter configuration is working in Discontinuous inductor current mode and it is recycled to control the yield voltage of DC and to enhance the power factor at the supply mains. Furthermore, it controls the voltage of DC-link and to find the speed controller of motor side. Here, the SRM with diode bridge rectifier (DBR) and also, with and without converter is analysed. The THD and power factor of the above systems was analysed. The power quality directories are obtained in the array of International power quality principles like IEC 61000-3-2. The drive performance is evaluated by using MATLAB/SIMULINK software.

Keywords: Switched reluctance motor (SRM) drive; Power quality; Bridgeless Canonical switching cell (CSC) converter; Mid-point converter; Discontinuous inductor current mode (DICM); THD.

Abstract: For the growing electricity demand solar energy has vital role. Power electronic device has important role for converting dc power extracted from sun light to suitable available form of energy such as ac power. The roof top solar P V are found in everywhere because of its available amount of power in an easy manner. The proposed system deals a single stage inverter for efficient ac-dc operation without line frequency transformer. It also overcomes the drawbacks of conventional inverter system. The proposed system can operate in both boost and buck mode by adjusting the control pulses. The system is analysed by using MATLAB/SIMULINK model.

Keywords: Renewable energy, MO SFET, Pulse Width Modulation (PWM), DC-AC inverter