Browsing by Author "Sheeja, V."

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A New Three Port Converter with Power Flow Management Control for Solar PV fed Telecom Load
(Institute of Electrical and Electronics Engineers Inc., 2020) Sheeja, V.; Kalpana, R.
Multiport converters are reported in the literature for integrating multiple power sources, primarily renewable energy sources along with energy storage systems. The use of multiport converters decreases power conversion stages and hence increased efficiency. A three port converter is presented in this paper for solar PV fed telecom load. The control of the three port converter for the power flow management is also discussed. A solar PV array, battery energy storage and the telecom DC load are connected at the three ports of the converter. The performance of the converter along with the power flow management control is validated with detailed simulation studies using MATLAB with its SimPower System Blockset. Â© 2020 IEEE.
A non-isolated bidirectional high gain integrated multiport converter for grid tied solar PV fed telecom load
(John Wiley and Sons Inc, 2023) Sheeja, V.; Kalpana, R.; Singh, B.; Subramaniam, U.; Muhibbullah, M.
A multiport converter (MPC) with a non-isolated high gain bidirectional port is proposed for the grid integration of solar photovoltaic array (SPA) fed telecommunication load. The SPA along with a battery energy storage (BES) meets the power demand of the telecom DC load and the excess/deficit power is exchanged with AC grid. The MPC feeds the DC link of a voltage source converter for bidirectional operation with the AC grid. The small signal analysis of the converter shows that its operation is stable. The SPA, BES, and telecommunication load are rated for lower voltages, consecutively reducing the complexity with series-connected SPA. The proposed MPC possesses the merits of high voltage gain, reduced inductor size, and reduced number of components. Moreover, a power flow management algorithm is devised for the proposed converter that regulates the DC voltage at the telecom load and ensures smooth power flow control among various ports. The MPC is able to operate at various modes by controlling the ports independently. The converter performance during steady state and dynamic operating conditions under various modes are analyzed with detailed simulation studies. An experimental prototype is developed and test results are demonstrated to prove the viability of the designed converter. © 2022 The Authors. IET Power Electronics published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.
A Reduced Switch Count Switched Capacitor Based High Voltage Gain Bidirectional DC-DC Converter for Grid Integration of BTS
(Institute of Electrical and Electronics Engineers Inc., 2020) Sheeja, V.; Kalpana, R.; Singh, B.
A high voltage gain bidirectional DC-DC converter with reduced switch count is presented in this work. Renewable energy sources such as solar PV array, that are available at low DC voltage, is being used for supporting the DC load of a base transceiver station along with battery energy storage. Hence, the low voltage DC grid system requires a bidirectional DC-DC converter for the bidirectional power flow with the AC grid. This converter has a high gain compared to other existing topologies with reduced active switch count. The performance of it is validated with detailed simulations and a hardware prototype. Moreover, the performance of the system is analyzed and studied for step-up and step-down operations with a solar PV array, BES and a load connected to DC grid. Â© 2020 IEEE.
Control of Converter for a Solar PV-BESS Powered Telecom Load With Real, Reactive and Harmonic Power Exchange With Grid
(Institute of Electrical and Electronics Engineers Inc., 2023) Sheeja, V.; Kalpana, R.; Subramaniam, U.; Almakhles, D.J.
Due to safety considerations and the challenges involved in tracking the maximum output of series-connected cells, solar photovoltaic (PV) arrays are generally operated at lower voltage levels. A multiport converter can be used to interface telecom DC loads, typically rated at 48 V and powered by PV arrays and battery energy storage system (BESS). The grid integration of the system improves reliability while lowering the BESS rating. This work proposes a sliding mode control-based power flow management controller that maintains the load voltage of a telecom DC load, allows maximum power extraction from the PV module, and facilitates power sharing with AC grid. A voltage source converter and a high-gain bidirectional converter exchange power with the AC grid. A second-order generalized integral algorithm-based voltage source converter control is provided to inject/absorb active power, reactive power, and eliminate the harmonics of the telecom AC load. Detailed simulation studies employing MATLAB software are performed to validate the functionality of the converter as well as the power flow management control. Moreover, the system's performance is evaluated using a laboratory-developed experimental prototype. © 2013 IEEE.
Interleaved High Gain Bidirectional DC-DC Converter for Grid Integrated Solar PV Fed Telecommunication BTS Load
(2018) Sheeja, V.; Kalpana, R.
In this paper, an interleaved boost based high gain bidirectional DC-DC converter for grid integrated solar PV fed telecommunication BTS (Base Transceiver Stations) load is proposed. A solar PV system is preferred to operate at low voltage due to the safety issues and the reduced power output in a series connected PV modules. The battery backup and the DC load in the system are also at low DC voltage and hence a system with low voltage DC bus is proposed. The low voltage DC bus (48V) is interfaced to high voltage (400 V) DC bus using a high gain DC-DC converter. A Voltage Source Converter (VSC) is used to connect this to the single phase AC grid of 230V. For the reliable operation of telecommunication station, the power flow has to be bidirectional. A bidirectional high gain DC-DC converter for this application is proposed and it is analysed, the expression for voltage gain is derived and the operation is verified with a MATLAB Simulink based modeling and simulation for both forward and reverse power flow. It is found that the switches are operated with less stress, the current ripple at low voltage DC bus is less and a high gain for boost and buck operation and is verified. � 2018 IEEE.
Interleaved High Gain Bidirectional DC-DC Converter for Grid Integrated Solar PV Fed Telecommunication BTS Load
(IEEE Computer Society help@computer.org, 2018) Sheeja, V.; Kalpana, R.
In this paper, an interleaved boost based high gain bidirectional DC-DC converter for grid integrated solar PV fed telecommunication BTS (Base Transceiver Stations) load is proposed. A solar PV system is preferred to operate at low voltage due to the safety issues and the reduced power output in a series connected PV modules. The battery backup and the DC load in the system are also at low DC voltage and hence a system with low voltage DC bus is proposed. The low voltage DC bus (48V) is interfaced to high voltage (400 V) DC bus using a high gain DC-DC converter. A Voltage Source Converter (VSC) is used to connect this to the single phase AC grid of 230V. For the reliable operation of telecommunication station, the power flow has to be bidirectional. A bidirectional high gain DC-DC converter for this application is proposed and it is analysed, the expression for voltage gain is derived and the operation is verified with a MATLAB Simulink based modeling and simulation for both forward and reverse power flow. It is found that the switches are operated with less stress, the current ripple at low voltage DC bus is less and a high gain for boost and buck operation and is verified. Â© 2018 IEEE.
Power Flow Management of a Solar PV and Battery Powered Telecom Load with Bidirectional Grid Power Exchange
(Institute of Electrical and Electronics Engineers Inc., 2021) Sheeja, V.; Kalpana, R.
Solar photovoltaic arrays are connected in series/parallel to increase the output power rating, but are desired to have lower voltage rating due to safety issues and the complexity associated with maximum power tracking of series connected cells. Because of the intermittent characteristics of PV power output, battery energy storage systems are also widely used along with solar PV to ensure the reliability. In this paper, a power flow management algorithm is presented along with a new fourport converter, for grid integration of solar PV and battery powered telecom load, operated at a lower voltage. The efficiency of system is high, as the number of power conversion stages are reduced in the fourport converter. The capacity of the battery energy storage system is reduced as grid power is available as back up to support the load. Also, the high voltage terminals of the converter is facilitating grid integration with the help of a H- Bridge inverter. The performance of power flow management control along with the converter is verified by extensive simulation studies using MATLAB software. A hardware prototype is developed in the laboratory and the performance of the system is validated. Â© 2021 IEEE.
Time sharing control based new four port converter for grid integrated solar PV Fed BTS load
(Institute of Electrical and Electronics Engineers Inc., 2020) Sheeja, V.; Kalpana, R.; Singh, B.
Multiport converters used for renewable energy applications reduce the stages of power flow and thereby increase the efficiency of the power conversion. In this paper, a new four port DC-DC converter is proposed for integrating PV array, DC load, battery storage system and high voltage port. There are two bidirectional ports, a high voltage gain port which is connected to AC grid through a VSC and a low voltage gain port connected to battery energy storage. The converter is derived, designed, modelled and simulated for a base transceiver station load. Moreover, a time shared control scheme for the four port converter is presented which is able to perform the power flow management during the dynamic conditions. The port with PV energy source is controlled for extracting maximum power from the PV array. The DC bus voltage, where the DC load of the base transceiver station is connected, is regulated to the desired magnitude. The power flow to grid and the BES are controlled as per the power management conditions. The performance of the four port converter along with control is verified by extensive simulation study using MATLAB with its SimPowerSystem tool boxes to substantiate the theoretical analysis. Â© 2020 IEEE.