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The brushless DC (BLDC) motor can be controlled either by fixed dc link voltage control with Pulse Width Modulation (PWM) or by variable dc link voltage control with Pulse Amplitude Modulation (PAM). But neither of these can be a proper method for BLDC motor. Since the PWM control induces high current and torque ripple at high speeds and PAM control limits its application at low speeds due to the...
A dual two-level inverter with an open-end winding induction motor can realise a three/four level voltage space vector. High switching frequency coupled with the use of such multilevel inversion system can produce good motor drive performance. This however can generate immense machine shaft voltage and bearing currents apart from large leakage ground currents that are deleterious to the motor drive...
In this paper, a comparative study of different harmonic elimination techniques has been adopted to mitigate the undesired dominant lower order harmonics from the output voltage of cascaded multilevel inverter. It has been shown that particle swarm optimization technique gives better result as compared to the mathematical theory of resultant and newton raphson method. Theoretical results are verified...
A novel 3-phase transformerless H-8 topology is proposed in this paper, which aims to limit the leakage current as per the standards by reducing the variation in common mode voltage (CMV). The proposed topology utilizes the advantages of both DC bypass and AC bypass circuit configurations. Thus, it is actually a hybrid bypass circuit configuration. Proposed topology has eight power devices, controlled...
This paper aims at design and implementation of light weight, smaller size, highly efficient and reliable single output DC-DC converter for defence application. To achieve miniaturization of the converter high switching frequency is selected, which in turn reduces the mass, size of magnetic and output filter components‥ To overcome the limitation of 50% duty cycle in auxiliary winding reset forward...
A multiple feedback control system developed for three phase three level neutral point clamped (NPC) pulse width modulation (PWM) voltage source front end converter (FEC) is presented. This technique does not require any load information. A forced switching technique is used to operate the converter at constant frequency. The system is modeled and multiple feedback control system is developed using...
Hysteresis current control (HCC) based voltage source converters (VSCs) have several advantages like good dynamic response, over-current protection, insensitive to load parameter variation and ease of implementation. The application of HCC technique for two-level VSCs are well established and few modifications of the same are also reported to operate with variable or constant switching frequency in...
Offline pulse width modulation (PWM) techniques are employed to reduce the line current distortion in induction motor (IM) drives where the switching frequency is highly constrained. An optimal PWM technique is proposed here for a neutral point clamped (NPC) inverter fed IM drive to minimize the motor current distortion, subject to constraints on number of switching instants per quarter cycle. Two...
A common-mode voltage eliminated 3-level PWM inverter based on an open-end winding induction motor drive is proposed in this paper. The open-end winding induction motor is fed from both sides by two 3-level inverters. The 3-level inverters are controlled by space vectors having zero common-mode voltage, thereby avoiding bearing current and leakage current in the system. In this scheme sector identification...
A discontinuous pulse width modulation (DPWM) strategy for variable load power factor (PF) with capacitor voltage unbalance control in a three level neutral point clamped (NPC) traction inverter drive for electric vehicles (EVs) is developed and presented in this paper. It is shown that the addition of an appropriate offset signal with the reference DPWM signals generates compensating neutral current...
This paper presents a novel GaN switching power device-based DC-AC converter using Heterodyne Technique. Compared with the traditional DC/AC converters, the proposed converter has a simpler circuit topology with less number of high speed switching devices, thus making more efficient and cost-effective converter with reduced size and weight. By the aid of Heterodyne Technique, DC power is converted...
This paper proposes a new hybrid asymmetric multilevel inverter for generating the higher number of levels with reduced number of power semiconductor switches. The hybrid asymmetric multilevel inverter consists of full bridge inverter and reduced switch inverter topology. The reduced switch inverter topology can generate 13-level output voltage without utilizing full bridge inverter. When the full...
A Dynamic Voltage Restorer (DVR) model is designed for the mitigation of voltage sag and is tested for distribution system to improve Power Quality (PQ). The design is carried out with the aid of Voltage Source Inverter (VSI) in the application of DVR. The experimental results obtained are presented in this paper to analyze the performance of VSI with Sinusoidal Pulse Width Modulation (SPWM) control...
This paper presents a novel three phase symmetrical cascaded multi-level inverter topology based on switched capacitor basic units. The proposed topology has inherent capability to boost the input voltage and can generate multilevel output voltage with reduced number of power supplies and switching devices compared to that for other recently developed three phase topologies. Further, the presented...
Microstepping drive for stepper motor is a well-known technique to improve stepper motor performance. Normally microstepping is carried at fixed pulse width planned. But this method is suitable only when motors are driven at fixed pre-defined speeds for non-real time applications. The problem discussed in this paper considers an application where motors need to track a given reference position profile...
This paper presents a new control technique for battery charging using AC-DC Active Front End (AFE) PWM rectifier for UPS application. The topology is based on sensorless adaptive control of charging current by varying the DC voltage level of AFE rectifier. System mathematical modelling via dq axes transformation is prepared for the derivation of the control law. Further the derived control algorithm...
This paper describes design and development of Pulsed Power DC-DC converter called Pulsed Power Supply Unit for Transmit/Receive Integrated Module of L-band SAR. This paper presents topology selection, design challenges and use of bias winding for feedback. Novel feature of this design is that by using bias winding for feedback overall efficiency is improved and excellent regulation of Tx outputs,...
This paper proposes a new hybrid cascaded multilevel inverter (HCMLI) using selective harmonic elimination pulse width modulation (SHE-PWM) that synthesizes an eleven level output voltage with two dc sources and a pre-charged capacitor using twelve switches, in contrast to conventional twenty switches and five dc sources. Genetic algorithm (GA) has been used to compute switching angles of the HCMLI...
This paper presents new gating techniques to improve the efficiency of full-bridge DC-DC converter for battery charging in electric vehicles. The converter is assisted by a passive auxiliary circuit to extend the soft-switching range. The uncontrolled auxiliary circuit current increases the conduction losses of the converter when gated with conventional phase-shift modulation (PSM) technique. The...
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...
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