Faculty Publications
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Item Power quality improvement in front-end hybrid AC-DC converter based on current injection technique(Institute of Electrical and Electronics Engineers Inc., 2017) P, P.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.This paper highlights the power quality issues and explains the remedial measures taken by means of hybrid frontend third harmonic current injection rectifiers. Here zig-zag transformer is used as the current injection device so that the advantages pertaining to zig-zag transformer is utilized effectively. The third harmonic current injection device along with the three-level boost converter at the output stage will increase the dc-link voltage. Also, the power quality is well improved using third harmonic current modulated front-end structure which is well appropriate to medium/higher power applications. The experimental prototype of hybrid front-end PFC rectifier is developed in the laboratory to validate the MATLAB simulation results. © 2017 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.