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Robustness, fast dynamic response and simplicity of direct torque control and field oriented control methods of induction motor can successfully replace dc motors. The development in multilevel inverter topologies and their control techniques made has improved the performance of these drives to the industrial requirements. The performances of these drives with diode-clamped multilevel inverter are...
Solar integrated current-fed quasi-Z-source inverter (qZSI) have been proposed to overcome the limitations of current-source inverter (CSI) and current-fed Z (impedance) source inverter (ZSI). The problems with CSI are unidirectional power flow and can perform only voltage boost operation. On the other hand ZSI is bidirectional with an additional diode and have voltage buck-boost capability. The techniques...
Hysteresis pulse width modulation has different application because of its unmatched dynamic response and wide command tracking bandwidth. The various hysteresis modulation schemes are available in literature for multilevel inverter. The techniques are desired and compare the reference signal to obtain the adequate switching frequency, excellent dynamic response and high accuracy in steady state operation...
This paper presents a direct flux and torque control (DTC) of induction motor drive (IMD) for speed regulator (SR) using fuzzy logic controller (FLC). This control method is based on DTC operating principles. The DTC is one of the most excellent strategies of torque and flux ripples control of IMD. The DTC control method has been optimized by using conventional PI controller in the SR loop of IMD...
In this paper, design of autotransformer based 24 Step AC-DC converter fed vector controlled Induction motor drive is presented and its Matlab/Simulink model is given. Also these results are compared with 12-pulse AC-DC converter fed vector controlled Induction motor drive. This paper deals with various multipulse AC-DC converters for improving the power quality in vector-controlled induction motor...
A space-vector pulse width modulation (SVPWM) switching strategy is described in this paper. A four-level voltage waveform using open-end winding configuration of an induction motor is obtained by using this strategy. Two unequal DC-link voltages, which are in the ratio of 2∶1 are used to generate the SVPWM based four level voltage wave forms. The proposed algorithm does not employ any look-up tables...
Multilevel inverters have gained interest in recent years in high-power medium-voltage industry. This paper considered the most popular structure among the transformer-less voltage source multilevel inverters, the diode-clamped inverter based on the neutral point converter. This paper use conventional switching sequence and optimum switching sequence of SVPWM technique. Simulation results presents...
Multilevel inverter is a new breed of power converter which is suited for high power applications. The various topologies of multilevel inverter are diode - clamped, capacitor clamped and cascaded H-bridge inverter. It is an effective solution for increasing the number of levels in output waveform with reduced dc sources and switching elements, thereby dramatically reduces harmonics without increasing...
The work proposes a new real time Harmonic Elimination Pulse Width Modulation (HEPWM) technique for Voltage Source Inverters which is a useful alternative over SPWM (Sinusoidal Pulse Width Modulation) for high power inverters used in the mains and drives. HEPWM provides ideal solution for switching losses in inverters when operated in low frequency range. The switching angle of the HEPWM can be calculated...
In recent years multi level inverters are used high power and high voltage applications. In this paper propose PWM control strategy thirteen level cascaded H- bridge multi level inverter. This method introduce sine wave is compared with the triangular carrier wave with different phase relationship. The carrier based Phase disposition PDPWM, PODPWM, APODPWM have been analyzed in this paper. The PWM...
This paper presents a detailed system analysis for HVDC converter controls both at rectifier and inverter terminal. The faults analysis has been carried out for all combinations of AC system strength which includes strong and weak system conditions. It has been observed that the system behaviour at weak inverter AC system conditions is very difficult to recover, however for strong AC system this effect...
Presently, many industrial processes require high performance switching control of a number of inverter-fed induction machines. Multi-motor drives employ various methods to reduce complexity and minimize the cost. Independent control of motors is required as these motors are subjected to frequently changing operating conditions. Recent researches have ascertained the independent control of parallel...
In this paper the design of a low power and high performance dynamic circuit using a new CMOS domino logic family called feedthrough logic is presented. The need for faster circuits with low power dissipation has made it common practice to use feedthrogh logic. The proposed circuit for low power improves dynamic power consumption as compared to the existing feedthrough logic and to further improve...
Majority of loads draw non-sinusoidal current from the supply, resulting in the generation of current and voltage harmonics. The presence of the harmonics leads to low system efficiency, poor power factor, increased losses and reactive power components of current from AC mains. In this paper a comparative study of current harmonic compensation using passive power filter, Shunt active power filter...
The paper proposes a method of modeling and simulation of Solar Photovoltaic (SPV) arrays, interface between two dissimilar toolboxes in MATLAB and different control schemes for the converter control. This paper also shows the simulation of the SPV in Trnsys. The main objective is to find the non-linear I–V equation by obtaining the curve at three points, open circuit, maximum power and short circuit...
Cascaded H-Bridge multilevel inverters synthesize a medium voltage output based on a series connection of power cells which use standard low-voltage component configurations. This characteristic allows one to achieve high-quality output voltages and input currents and also outstanding availability due to their intrinsic component redundancy. Due to these features, the cascaded multilevel inverter...
This paper provides an efficient way to eliminate the interharmonics appearing in the adjustable speed drives. The conventional diode bridge rectifier is replaced by controlled rectifier to have better control over the interharmonics's adverse effects in the drive. The proposed method also eliminates the use of supply side impedance to reduce the interharmonics in the system. Thereby, it increases...
This paper presents the space vector modulation (SVM) based direct torque control (DTC) of induction motor fed by a three level neutral point clamped (NPC) inverter. The SVM DTC system avoids the use of the hysteresis controllers and the look up table which are usually used in the classical DTC scheme. A novel sliding mode controller (SMC) is proposed which controls the speed of the induction machine...
A new method to reduce the torque ripple and current harmonics is presented in this paper. A conventional 2 level inverter is fed with two inductor boost converter to drive the induction motor. A Hybrid Pulse Width Modulation (HPWM) algorithm is being used to generate the pulses for the 2 level inverter. In proposed hybrid PWM both continuous PWM and discontinuous PWM techniques are employed. This...
Multilevel Inverter (MLI) has been recognized as an attractive topology for high voltage DC-AC conversion. Function of a multilevel inverter is to synthesize a desired voltage wave shape from several levels of DC voltages. But the main drawback of MLI is its output voltage amplitude is limited to DC sources voltage summation. To overcome this limitation, a five-level cascaded multilevel inverter based...
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