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The polyphase induction motor is the most widely used ac motor because of its numerous advantages like low in cost, simple & rugged construction, absence of commutator and good operation. In the recent past Multilevel inverter technology has emerged as very important alternative in the area of high power, medium voltage control. By using these inverters we can change the frequency levels of induction...
This paper presented the design and implementation of an induction motor drive. In order to improve energy efficiency of this drive, system configuration comprised a single to three-phase converter with additional circuitry for PFC. In this design, using TI's UC3854 as the PFC controller chip, and the related parameters were designed. The control scheme was based on V/f control using two low-cost...
To reduce energy consumption, a novel motor system is proposed using two individual current control technologies involving a multiphase inverter. The multiphase inverter technology comprises two sets of 3-phase windings connecting two 3-phase inverters. Each set of coils connecting the 3-phase inverters forms a rotating field. Two windings allow the resultant field to generate a rotating field of...
A novel position/speed sensorless vector control approach which is capable of not only driving Induction Motors (IMs), damperless surface/interior Permanent Magnet Synchronous Motors (PMSMs) and PMSMs with damper winding but also tuning all electrical motor parameters used for their sensorless control system design by a unified method is discussed. This approach is tentatively named the Universal...
This paper presents a solar powered water pumping system using an Induction Motor to pump the water. A negative output dc-dc Luo converter is used to achieve maximum power tracking and regulated dc output from a variable input solar photovoltaic array (SPV). The reduced number of components and single switch feature of Luo converter reduces the output current ripples and extracts maximum power from...
This paper presents the prediction of dynamic and steady state operation of the single phase capacitor start capacitor run induction motor for different values of capacitor and same frequency of voltage supply at no-load and full load condition with open loop and closed loop system. AC power from the mains is considered as a reference and multiple possibilities of a single inverter topology are fed...
Pulsewidth modulation (PWM) variable speed drives are increasingly applied in many industrial applications that require superior performance. The carrier-based PWM strategy can be improved by adding different zero sequence signals to the reference sinusoidal phase voltages. This paper presents a comparative evaluation of five carrier-based PWM techniques with zero-sequence signal injection for a six-switch...
This paper presents proportional integral direct torque control (PIDTC) and fuzzy-2 DTC (F2DTC) of the induction motor (IM) drive using space vector modulation (SVM) for five-level diode clamped inverter (FDCI). The above control schemes have been implemented in the laboratory using 2HP IM through a DSPACE DS-1104 controller. The dc-link capacitor voltages of FDCI are balanced in both the control...
This paper presents proportional integral direct torque control (PIDTC) and fuzzy direct torque control (FDTC) of induction motor (IM) using bus clamped space vector modulation (BCSVM), in which BCSVM always clamps any phase of the inverter for given switching period. Conventionally, the total cost of control scheme significantly increases in real time applications as it needs to sense three voltages,...
A new scheme for SCR based Current Source Inverter (CSI) fed Induction Motor (IM) with open-end stator windings is presented in this paper. The proposed topology has an SCR based CSI at one end of the stator windings and a capacitor fed Voltage Source Inverter (VSI) at the other end. A major drawback of the conventional SCR based CSI for IM drive is the requirement of forced commutation circuit for...
The space vector approach in real time pulse width modulation offers variety of switching patterns for effective control of induction motor drives. In high power motor drives switching frequency of the inverter is very less due to increased losses. The harmonic distortion in the stator current due to low switching frequency can be reduced by using synchronized PWM strategies. In this paper space vector...
This paper presents a simplified space vector pulse width modulation method for multilevel inverters. In this method, the desired switching states of the reference voltage vector and switching time calculations are done online through generalized simple expressions without any predetermined data in the memory lookup table. The proposed method is also extended for over modulation region by incorporating...
In real time field conditions, situation arises when sudden and a large change in insolation level occurs. Such frequent fluctuations in irradiation level, affects adversely the performance of Photovoltaic (PV) based water pumping system. Sudden large fall in insolation leads to generation of PV power which is insufficient for operation of motor-pump system and such frequent variations in insolation...
This paper presents Direct Torque Control (DTC) of induction motor drives using three-level Neutral Point Clamped (NPC) inverter. The usage of hysteresis controller that utilized in conventional DTC lead to varying switching operation, therefore a Constant Switching Frequency (CSF) torque controller is proposed to replace the torque hysteresis controller. The proposed CSF controller consists of Proportional-Integrator...
Intelligent drive control methods are very much essential for the efficient use of Induction motors in various industrial production processes. Fault diagnosis of induction motor drives is based on the Voltages, Currents and Speed. In this paper hybrid structures of Neuro-Fuzzy (BPN with Fuzzy logic) are proposed for external fault diagnosis of induction motor drive. The results are analyzed based...
The short list of requirements to the traction electric drive has to satisfy is highlighted. The topologies and operation principles of two- and three-level voltage source inverters fed a traction induction motor are presented. The brief survey of the frequency converters faults and malfunctions is carried out. The transient modes of electric drives under transistor short-circuit fault and transistor...
Carrier-based methods have been used widely for switching of multilevel inverters due to their simplicity, flexibility and reduced computational requirements compared to space vector modulation (SVM). This paper focuses on Multicarrier Sinusoidal Pulse Width Modulation (MCSPWM) strategy for the three phase Five-Level Flying Capacitor Inverter (5LFCI). The inverter is simulated for Induction Motor...
The direct torque control (DTC) is the preferred control technique of the induction motor in electric traction applications. It has advantages, as it is a sensorless control technique, but also disadvantages. The main disadvantage is related to the switching frequency which is the same with the sampling frequency of the entire control loop. This determines high requirements for the control system...
Renewable energy sources (RES's) is the major source of electrical energy in future, the available renewable energy systems are solar, wind, fuel cell out of these solar system is most popularly used because this source hugely available in nature, this renewable energy source (RES) is most in demand for agricultural, industrial applications. In the agricultural field renewable energy source (RES)...
This paper presents a real-time performance evaluation of direct torque control (DTC) and regenerative braking control of improved z-source inverter fed induction motor drives using field programmable gate arrays (FPGA) based real-time digital simulator (RTDS). RTDS was built using Very High Speed Integrated Circuit Hardware Description Language (VHDL), composing it versatile and compact. The proposed...
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