Journal Articles
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Item Dynamic voltage restorer (DVR) –areview(River Publishers editor@jgenng.com, 2018) Remya, V.K.; Parthiban, P.; Ansal, V.; Babu, B.Power quality (PQ) is gaining a great deal of importance as more sensitive loads are introduced into the utility grid. The degradation of product quality, damage of equipment and temporary shutdowns are the general issues associated with PQ problems in industries. Any mal-operation or damage of the industrial sensitive loads results in monetary losses disproportionately higher than the severity of the PQ issues. The evolution of power electronics technology replaced the traditional power quality mitigation methods with the introduction of Custom Power System devices (CUPS). The major power electronic controller based CUPS are DSTATCOM, DVR and UPQC. DVR is a pertinent solution for the economic losses caused by the PQ issues in the industries. Among the CUPS, DVR is the most cost-effective one. In the published literature, only a few papers correspond to the review of DVR technology. In this paper, a systematic review of published literature is conducted and a description is given on the design, standards and challenges in the DVR technology. A detailed survey is conducted on the published literature to address the various aspects and issues in the DVR system. This paper arrangement gives the working principle, structure, various topologies, compensation techniques, voltage sag detection methods and control methods of the DVR under different sections. The section “Challenges faced by the DVR” included in the manuscript can be useful for the researchers beginning their work in the domain of DVR. The simulation results using the sim power system tool of MATLAB/Simulink software are provided for analysis and comparison. © 2018 the Author(s). All rights reserved.Item Performance analysis of micro wind turbine based energy systems with series connected inverters and a novel switching network(River Publishers editor@jgenng.com, 2017) Kodeeswara Kumaran, G.K.; Parthiban, P.The increase in demand for electricity coupled with the obligation to use sustainable technologies, has led to research and development in small and medium scale renewable source based electricity generation systems. When it comes to the smaller systems, one of the important criteria in commissioning/ operating is simplicity of the system apart from the systems capability to produce power with acceptable standards. To meet this requirement, a novel switching network referred in this paper as comparator based switching signal selection (CSSS) network, has been proposed for controlling the inverter circuit in the generation system. The network enables the use of any two level inverter modulation schemes to control any levels of series connected inverter. This eliminates the complexity like generation of multiple carrier waveforms, performing complex calculations to generate switching signals. To demonstrate the effectiveness of employing this switching network in a generation system, the performance of a micro wind turbine based energy system has been analyzed using parameters like harmonic distortion of current, voltage and k-factor of the transformer. A comparative study of these parameters has also been performed to understand how comparable the performance of CSSS network is to the existing modulating schemes. The result of analysis and comparison shows that by employing a CSSS network, not only satisfactory performance can be obtained from the system, but also the control algorithm can be simplified. © 2017 the Author(s).Item Implementation of Single-Phase Two-Switch Midpoint Unidirectional Multilevel Converter System(Walter de Gruyter GmbH, 2018) Roy, P.R.; Parthiban, P.; Babu, B.This paper deals with implementation of a single-phase three level converter system under low voltage condition. The frequency of the switches is made constant and involves change in $-t-on}}$ton and $-t-off}}$toff duration. For this condition the pulse width modulation control scheme for a single phase three level rectifier is developed to improve the power quality. The hysteresis current control technique is adopted to bring forth three-level PWM on the dc side of the bridge rectifier and to achieve high power factor and low harmonic distortion. Based on the proposed control scheme, the line current is driven to follow the sinusoidal current command which is in phase with the supply voltage. By using three-level voltage pattern the blocking voltage of each power device is clamped to half of the dc link voltage. The simulation and experimental results of 20W converter under low input voltage condition are shown to verify the circuit performance. Open loop simulation and hardware tests are implemented by applying a low voltage of 15 V(rms) on the input side. © 2018 Walter de Gruyter GmbH, Berlin/Boston 2018.Item Reconfigurable highly efficient CMOS-based dual input variable output switched capacitor converter for low power applications(Institution of Engineering and Technology journals@theiet.org, 2018) Abraham, C.; Subburaj, V.; Jena, D.; Parthiban, P.; Jose, B.R.; Mathew, J.A reconfigurable switched capacitor converter (SCC) topology with nine/ten CMOS switches and two flying capacitors is presented. It is capable of accepting two input sources simultaneously with an input voltage in the range of 1-2.5 V and delivers the output for 15 conversion ratios. The proposed SCC can drive a load current ranging from 10 ?A to 10 mA at an open loop efficiency of >90%. One of the important applications of the proposed converter is the utilisation of photovoltaic (PV) or the combination of PV and other direct current sources. The regulation of the output voltage can be achieved either by changing the voltage conversion ratios or using variable switching frequency.Item A fixed frequency duty-ratio based digital sliding-mode controller for DC-DC buck converter(American Scientific Publishers, 2018) Parthiban, P.; Ronanki, D.; Kiran, B.The hysteresis modulation (HM) based sliding mode control (SMC) implementation results in variable frequency, where the converter's operating frequency cannot be measured accurately. This will have a negative impact on circuit component and filter design. Furthermore, it is sensitive to the disturbances and the parameter uncertainties. To maintain constant switching frequency during line and load regulation, a duty-ratio (DR) based sliding-mode (SM) control approach is proposed in this paper and applied to a DC-DC buck converter. The translation of the SM control law for HM and DR scheme implementation by using field programmable gate array (FPGA) for DC-DC buck converter is illustrated. A simple and self-explanatory design and implementation procedure are also addressed. The performance and robustness of the proposed DR-based SM controllers are validated by both simulation results using MATLAB/Simulink and experimental results. The robustness of the SM controller is tested at various operating conditions and compared the results with HM-based SM and conventional linear controller. © 2018 American Scientific Publishers All rights reserved.Item Single-Phase DVR with Semi-Z-Source Inverter for Power Distribution Network(Springer Verlag, 2018) Remya, V.K.; Parthiban, P.; Ansal, V.; Nandakumar, A.A novel topology of single-phase dynamic voltage restorer (DVR) is proposed to compensate the load voltage during voltage sag and voltage swell events. The semi-Z-source converter is utilised in its inverter operating mode for this proposed topology. The reduction in the number of active switches in the inverter and also in the current conduction path without compromising the output voltage range is the merit of the semi-Z-source inverter-based DVR against the commonly used full-bridge inverter-based DVR. The load voltage contains harmonics within the permissible limits when the compensation is performed by the semi-Z-source inverter-based DVR. The need for the filter circuit is eliminated; hence, the magnitude difference and the phase shift in the inverter output voltage due to the filter circuit are not present in the semi-Z-source inverter-based DVR. The proposed topology is cheap compared to the full-bridge inverter-based DVR topology. The simulations performed in MATLAB/Simulink environment are presented to validate the performance of the proposed topology. A comparison between the semi-Z-source inverter-based DVR and full-bridge inverter-based DVR is presented in this paper. The novel topology of DVR using semi-Z-source inverter is proved to be a better solution to the full-bridge inverter-based DVR. © 2017, King Fahd University of Petroleum & Minerals.Item Direct torque and flux control of switched reluctance motor with enhanced torque per ampere ratio and torque ripple reduction(Institution of Engineering and Technology JBristow@theiet.org, 2019) Krishna Reddy, P.; Ronanki, D.; Parthiban, P.A smooth torque control of switched reluctance motor (SRM) is essential to avoid speed fluctuations causing stability problems in vehicular applications. This can be accomplished by an appropriate motor design and/or use of direct control of torque in SRM. It is reported that high RMS current is required to minimise the torque ripple in the conventional direct torque and flux control (DTFC), thereby reducing the torque per ampere ratio. To overcome this issue, a new DTFC technique with improved torque per ampere ratio while minimising torque ripple in an SRM traction drive is presented. Results demonstrated that the proposed DTFC technique reduces torque ripple with enhanced torque per ampere. Finally, the performance of the proposed scheme is compared with conventional DTFC of a four-phase (8/6) SRM to show the improvement in the traction drive. © The Institution of Engineering and Technology 2019Item Investigation of a family of dual-output coupled/decoupled switched capacitor converter for low-power applications(Institution of Engineering and Technology JBristow@theiet.org, 2019) Subburaj, V.; Zhaikhan, A.; Jena, D.; Parthiban, P.; Mustafa, Y.; Ruderman, A.Here, accurate transresistance calculations for the coupled case and mathematical modelling are provided for dual input–output switched capacitor converter (SCC). This converter offers two different output voltages and produces 36 voltage conversion ratios. The dual input–output SCC is portable and operates by considering either sources or the combination of both Vs1 and Vs2 as input sources. The proposed dual input–output SCC has the ability to vary 54 voltage ratios. An efficient low-power SCC is designed for an input voltage range of 1.5–5 V and it gives dual-output voltages of 1–10 V. The proposed converter can operate in both buck and boost modes. The SCC has high drive capability of load current in the range of 10 µA to 100 mA that is adjusted by varying the operating frequency. The accurate equivalent resistance for both coupled and decoupled load cases is found and validated. The results are verified through PSIM simulations and validated experimentally. The mathematical, simulation, and experimental results give excellent proof for proposing the newly designed converter for applications requiring large conversion ratios eliminating inductors. © The Institution of Engineering and Technology 2018.Item Two phase (reconfigurable) inverting switched capacitor converter for micro power applications and its accurate equivalent resistance calculation(Institute of Electrical and Electronics Engineers Inc., 2019) Subburaj, V.; Mustafa, Y.; Zhaikhan, A.; Jena, D.; Parthiban, P.; Ruderman, A.This brief addresses inverting switched capacitor converter (SCC) for driving the white light emitting diodes (WLEDs). The various voltage conversion ratios (VCRs) are selected to control the WLEDs blacklights, which helps to save the battery life. The major contribution are developing maximum VCRs for power converter integrated circuits (ICs) and equivalent resistance (Req) accurate calculation which includes all conduction and ohmic losses. Furthermore, inverting SCC (ISCC) experimental results are obtained from prototype model. Accurate Req analyses validates the accuracy of proposed topology. It is designed for low voltage of 10 mV to 0.1 V and it provides the output voltage of-100 mV to-0.5 V. Finally, the novelty of accurate Req calculation in this brief is that the calculation results are verified with experimental ones, particularly, at the transition region (between slow switching limit and fast switching limit). On the other hand, calculation, simulation and experimental results perfectly coincide with each other. Accurate equivalent resistance calculation and average current calculation are compared and some of the recent publications providing the merits of the proposed converter are explained. © 2018 IEEE.Item Efficiency improvement and torque ripple minimisation of four-phase switched reluctance motor drive using new direct torque control strategy(Institution of Engineering and Technology kvukmirovic@theiet.org, 2020) Pittam, P.K.; Ronanki, D.; Parthiban, P.The direct torque control (DTC) strategy is one of the most effective techniques, used to control the switched reluctance motor (SRM) with improved dynamic performance and reduced torque ripple. However, this approach draws a higher source current due to an extension of the phase current into the negative torque region, which lowers the net torque per ampere ratio. This study proposes a new DTC strategy for SRM to overcome this issue by modifying the partition of the sectors and appropriate voltage vector selection. Therefore, the proposed method improves the drive efficiency while minimising torque ripple. To implement this method, a non-linear machine model is developed using the torque and flux characteristics obtained from experimental studies on a four-phase 8/6 SRM. The proposed DTC scheme is implemented on a digital control platform and power loss calculations are performed to evaluate the drive efficiency. Test results show that the proposed DTC method has improved performance in terms of efficiency and torque ripple under various operating conditions in comparison to the conventional DTC strategy. © The Institution of Engineering and Technology 2019.