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Item Design and Implementation of Sensorless Voltage Control of Front-End Rectifier for Power Quality Improvement in Telecom System(Institute of Electrical and Electronics Engineers Inc., 2018) P, P.S.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.In this paper, a three-phase three-switch three-level boost (Vienna) type pulse-width modulation rectifier is proposed as an active front-end power factor correction (PFC) rectifier for power quality improvement in telecom load. A sensorless voltage control technique is proposed and it does not rely on any input voltage information results in reliable and robust operation. A brief description on the principle of operation and the most advantageous modulation method of the proposed system are discussed. The feasible switching states are identified for the proposed active front-end converter resulting in reduced switching stress and dc ripples. A triangular carrier based control logic is applied and the input current reaches sinusoidal shape without the need of sensing the input voltage. The detailed analysis of front-end PFC converter is carried out by equivalent circuit analysis. Also, the complete loss and efficiency calculation of the converter is explicitly carried out with the help of hardware design guidelines. The performance of the proposed system and its capability of operating satisfactorily in the event of failure of one phase of the mains is verified through MATLAB Simulation, and the results obtained are presented. The experimental setup rated for 9 kW is developed in the laboratory to validate the simulation results. From the simulation and hardware results, it is observed and recorded that the power quality parameters are improved and are well within the IEEE and IEC standards. © 1972-2012 IEEE.Item Design and analysis of solar photovoltaic array fed modular full-bridge DC-DC converter for 12 kW SMPC(Institute of Electrical and Electronics Engineers Inc., 2018) P, P.S.; Kalpana, R.; Singh, B.This paper discusses the solar photovoltaic (SPV) array fed switched mode power converter (SMPC) using a modular full-bridge dc-dc converter as an intermediate converter. Among the different types of dc-dc converters, the straightforward and uncomplicated boost converter is selected in order to obtain the maximal power from the SPV array. The straightforward boost converter with reduced part count has inherent features of minimizing the output current ripples and possessing an unbounded region for maximum power point extraction. The improved efficiency of the converter is achieved by designing the SPV array to deliver maximum power at rated dc voltage and maximum switch utilization of the boost converter. The design, analysis and operating modes are explained for the proposed converter and the performance is validated through MATLAB/Simulink based simulation. © 2017 IEEE.Item Design and Development of Multi-Phase Rectifier with Reduced Magnetic Rating(Institute of Electrical and Electronics Engineers Inc., 2018) P, P.S.; Kalpana, R.; Singh, B.This paper proposes a 20-pulse asymmetric multiphase rectifier (AMPR) suitable for medium and high-power applications. Unlike the other state-of-the-art 20-pulse delta connected autotransformers, the proposed delta connected AMPR has an ability to reduce input harmonics, maintains high efficiency and requires a magnetic rating of only 30.12% of the nominal load thereby a significant reduction in space, weight, and overall cost required are the salient features of the proposed AMPR. Firstly, the proposed AMPR configuration is simulated in MATLAB/Simulink environment for evaluating its viability under different loading conditions, and the results are illustrated. Also, a prototype is developed, and the experimental measurements obtained are presented to validate the feasibility and operability of the proposed AMPR. The proposed AMPR offers a total harmonic distortion of 3.7% and can operate at near-unity power factor complying with the IEEE and IEC standards. © 2018 IEEE.Item A 36-Pulse AC-DC Converter with DC Side Tapped Interphase Bridge Rectifier for Power Quality Improvement(Institute of Electrical and Electronics Engineers Inc., 2018) P, P.S.; Kalpana, R.; Chethana, K.S.; Singh, B.This paper presents a circuit configuration to reduce the harmonic contents at the AC mains of a 12-pulse zigzag configured autotransformer based DBR. The proposed circuit configuration employs a tapped interphase bridge rectifier at the DC side of 12-pulse DBR that results in higher pulses in the supply current. Thus, reducing the harmonic content and thereby improving the power quality of the system. Since the autotransformer employed is zigzag configured, the need for ZSBT is eliminated. Moreover, the proposed circuit configuration at the DC side shapes the supply current near to a sine wave. Further, the proposed configuration is analyzed, simulated in MATLAB Simulink and the simulation results are presented, which confirms the improvement in power quality parameters in the input AC line current. Further, the viability of the proposed configuration is verified by experimental results which confirm the suitability of the proposed configuration in AC-DC applications. © 2018 IEEE.Item Investigations on Single-Phasing Effect of Zigzag Autoconfigured Transformer Based 12-Pulse Rectifier(Institute of Electrical and Electronics Engineers Inc., 2018) Kalpana, R.; P, P.S.; Vidyasagar, V.S.; Singh, B.High power industrial loads are often fed from front-end multi-pulse rectifier as its ability to effectively and inexpensively mitigate the harmonics on the AC side is achieved by the multi-pulse autoconfigured transformer. This paper analyzes and investigates the operability of the zigzag autoconfigured transformer based 12-pulse rectifier when one of the input terminals is open, i.e., single-phasing. Contrary to the prior art multi-pulse rectifiers, the availability of neutral point in zigzag autoconfigured transformer results in normal operation at DC side during single-phasing. A detailed MATLAB Simulation is carried out to understand the single-phasing operation of the zigzag autoconfigured transformer. Further, the experimental results from the laboratory prototype are presented to validate the simulated results. © 2018 IEEE.Item Power Quality Enhancement in AC-DC Converter Using Voltage Sensorless Control Technique(Institute of Electrical and Electronics Engineers Inc., 2018) P, P.S.; Kalpana, R.; Singh, B.This paper presents the power quality improvement in power supply systems and explains the corrective measures taken by means of front-end AC-DC converter. The front-end AC-DC converter having a boost type delta connected rectifier with voltage sensorless control technique is proposed. The delta switch rectifier enables the zero-sequence component circulation and thereby reduces the third harmonic component in the input mains. Further, the input voltage sensorless control is developed for the proposed converter which can maintain the power quality well within the IEEE and IEC standards and also, yields lesser switching loss, reduced switching stress and high output voltage. The performance of the front-end AC-DC converter configuration is validated by simulating in the MATLAB Simulink environment and the results are presented. The experimental setup for the front-end AC-DC converter is implemented in the laboratory to validate the MATLAB simulation results. © 2018 IEEE.Item Power Quality Improvement in Utility Interactive Based AC-DC Converter Using Harmonic Current Injection Technique(Institute of Electrical and Electronics Engineers Inc., 2018) P, P.S.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.This paper highlights the power quality issues and explains the remedial measures taken by means of hybrid front-end third harmonic current injection rectifiers. Here, a zig-zag transformer is used as the current injection device so that the advantages pertaining to the zig-zag transformer are effectively utilized. The third harmonic current injection device along with three-level boost converter at the output stage will increase the dc-link voltage. With less boost inductance, generally half of the conventional boost converter inductance is sufficient to implement the proposed converter structure resulting in reduced ripple current and also the device rating is reduced by half of the output voltage. Moreover, the power quality is well improved using third harmonic current modulated front-end structure, which is well appropriate for medium/higher power applications. The experimental prototype of hybrid front-end converter is developed in the laboratory to validate the MATLAB simulation results. © 1972-2012 IEEE.