Faculty Publications

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Publications by NITK Faculty

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    High-efficiency improved 12kW switched mode telecom rectifier
    (Institute of Electrical and Electronics Engineers Inc., 2016) P, P.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.
    In this paper an improved switched mode telecom rectifier for a 12kW telecommunication system is presented. An improved telecom rectifier is a combination of phase-shift transformer based ac-dc converter and passive high pass filter. The phase-shift transformer and high pass filter is realized with a fractional magnetic rating of the load. The supply current is almost sinusoidal with low total harmonic distortion, and the power factor (PF) is close to unity. The complete design of phase-shift transformer based ac-dc converter and passive high pass filter is presented in this paper. The 12kW telecom rectifier is designed, modeled and simulated to reduce the total harmonic distortion (THD) of the input ac mains current and to improve the power factor. A laboratory prototype of phase-shift transformer based ac-dc converter is developed and the results are presented to validate the design topology. © 2015 IEEE.
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    Configurations of modular push-pull buck DC-DC converters for 12KW telecom SMPS and its design
    (Institute of Electrical and Electronics Engineers Inc., 2016) P, P.; Kalpana, R.
    In this paper the push-pull buck DC-DC converter topologies are presented for 12kW telecom power supply. They have some attractive features compared to boost converters such as meeting the requirement of varying controllable output dc voltage, inherent short-circuit protection, and easy control of inrush current. Their input currents can be controlled in the open loop and much wider voltage loop bandwidth can be achieved. The proposed modular converter is modeled and its various configuration performance is simulated in MATLAB environment along with SIMULINK and Sim Power System (SPS). © 2016 IEEE.
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    High performance three-phase PFC rectifiers for telecom power supply
    (Institute of Electrical and Electronics Engineers Inc., 2016) P, P.; Kalpana, R.
    Generally telecom power supply requires higher efficiency from the ac input mains to the load end. So the front-end power factor correction (PFC) rectifier should show very high efficiency. In this paper, the front-end ac-dc converter having a boost type PFC rectifier which is a logical solution to the telecom applications is proposed. The Minnesota rectifier and Delta Switch rectifier are discussed for the front-end PFC converter which can be used for power quality improvement. Then the output of PFC rectifier is given to the three-phase high frequency dc-ac converter which intern drives the high frequency transformer (HFT) and produces the voltage level of 60V and 100A. These whole front-end and back-end converter configurations are classified as hybrid telecom power supply. The performance of front-end three-phase PFC rectifier with the back-end dc-dc converter configuration is simulated in the MATLAB Simulink environment and the results are presented in order to validate the design. © 2016 IEEE.
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    High performance front-end PFC rectifier for telecom power supplies
    (Institute of Electrical and Electronics Engineers Inc., 2017) P, P.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.
    High-current low-voltage (HCLV) rectifiers are used in the telecom industries, electroplating and induction heating system. Typical power rating of these rectifiers varies from tens of kW to hundreds of MW. In this paper, a three-phase three-level boost type PWM rectifier is proposed as an active front-end PFC scheme for telecom load. The proposed active front-end PFC converter is modeled by switching cycle average model and relation between duty ratio and the dc-link capacitor voltage is derived as in terms of system input currents. Also, the switching states have been derived for the feasible converter operation. The detailed analysis of front-end PFC converter is carried out by equivalent circuit. The power quality also well improved by proposed active front-end PFC rectifiers. The experimental setup for a 12 kW active front-end PFC rectifier is developed in the laboratory to validate the MATLAB simulation results. © 2016 IEEE.
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    Current injection based front-end power quality improved converter for telecom load
    (Institute of Electrical and Electronics Engineers Inc., 2017) P, P.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.
    In this paper a front-end converter having third harmonic current injection technique is used for improving input current shape as near sinusoidal. 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 and the current is injected through zig-zag transformer. The power quality is well improved using third harmonic current modulated front-end structure which is very well applicable to telecom load having the high current low voltage. Extensive simulation is carried out for the 12 kW load and the results are verified through experimental setup. The experimental setup is tested for reduced voltage rating and the test results are presented. © 2016 IEEE.
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    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.
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    Solar Photovoltaic Array fed Push-Pull Buck DC-DC Converter for Telecom Load
    (Institute of Electrical and Electronics Engineers Inc., 2018) P, P.; Kalpana, R.; Singh, B.
    This paper discusses the solar photovoltaic (SPV) array fed telecom load using modular push-pull buck dc-dc converter as an intermediate converter. The straightforward boost converter with lesser number of components and single switch device has inherent features of reducing the ripples in its output current. Also, the proposed front-end structure extracts maximum power in the boundless region. The SPV array is designed such that the power at rated dc voltage is supplied to the telecon load and maximum switch utilization of boost converter is achieved which results in improved efficiency of the converter. The design and analysis are carried out for the proposed converter and the performance of the proposed system is validated using MATLAB based simulation. © 2017 IEEE.
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    Power factor correction in multi-pulse rectifier using zigzag auto-connected transformer and non-isolated SEPIC converters
    (Institute of Electrical and Electronics Engineers Inc., 2020) Nikshitha Rao, A.S.; Kalpana, R.; P, P.; Singh, B.
    To enhance the harmonic mitigation capability of the multi-pulse rectifier, this paper proposes a multi-pulse rectifier based on harmonic mitigation technology at DC link. The conventional 12-pulse rectifier does not meet the IEEE-519 standard and hence the active power factor correction technique is employed to mitigate the harmonics. The proposed system employs two diode bridge rectifiers, each followed by a SEPIC converter, by controlling the SEPIC converter inductor current, the input line current of the rectifier can be approximated to a sinusoidal waveform. A zigzag connected autotransformer is used as a phase-shift transformer in order to provide a phase shift and inherently blocks the zero sequence components. This method reduces the total harmonic distortion and also decreases the size of the system. The proposed configuration is analyzed and simulated in the MATLAB Simulink and also implemented in laboratory. The results show that the proposed method improves the power quality by reducing the total harmonic distortion (THD) in the input line current. © 2020 IEEE.
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    A Study on High-Frequency Transformer Design with Different Core Configurations for Flyback Converter Topology
    (Institute of Electrical and Electronics Engineers Inc., 2023) Vignesh Kumar, V.V.; P, P.; Vangapally, A.; Balasubramanian, B.
    The rapid advancements in the switched mode regulator technology necessitate an effective magnetic circuit for the converter topology. The design of magnetics plays a vital role in achieving the essential requirements of switching regulator circuits such as high-power density level, low thermal dissipation and high efficiency. Hence, this paper is focused on the high-frequency practical transformer design for flyback topology that is most widely used in the switched mode power supplies units. A case study is performed by employing different core configuration for high frequency flyback transformer which is the main contribution of this paper. The comparative performance analysis in terms of the dimensions, losses incurred and efficiency is reported for selecting the proper choice of core for the flyback topology. © 2023 IEEE.
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    A Critical Review of MPPT Algorithms for PV Systems
    (Institute of Electrical and Electronics Engineers Inc., 2024) P, P.; Anusha, R.; Kumar, V.V.; Balasubramanian, B.
    With the growing population, one of the main issues is electricity. Electrical power can be generated from a variety of conventional or non-renewable and non-conventional or renewable energy resources. However, there are negative effects of using non-renewable energy resources on both the environment and the human population. Searching for an alternate energy source is necessary due to the limited availability of these fossil fuels. Among the alternatives that can be used to generate electricity are renewable energy resources that transform energy from the sun, wind, falling water, etc. Solar energy is one among these energy resources that is available in abundant. The fundamental components of photovoltaic (PV) systems are solar cells, which are connected in parallel and series to produce the necessary amount of power. There is only one peak in the PV panel characteristics when all the panels receive the same amount of insolation. However, PV systems commonly experience non-uniform insolation due to shadowing. Their power-voltage (P-V) curve show several peaks under these circumstances, with a single global maximum power point (GMPP) among all. Operating these panels at GMPP during partial shading conditions (PSC) is a challenging task as the insolation keeps changing frequently. This study gives a detailed review of various maximum power point tracking (MPPT) methods that is used during uniform and PSC. This review will help the researchers to explore the possibility of choosing best alternative MPPT techniques to be incorporated for commercial purpose. © 2024 IEEE.