School of Engineering and Sciences
Department of Electrical and Electronics Engineering
Revamping the Method of Advanced V/f Control for Precision Speed Regulation in Three-Phase Induction Motors
Abstract: The paper investigates the efficacy of V/f scalar control for a three-phase squirrel cage induction motor (IM) integrated with a proportional-integral (PI) controller and MOSFET-based inverter. The key objective is to achieve robust speed regulation and stability under varying load disturbances. In the present work, two control schemes have been delved (a) the closed-loop approach, offering superior performance but less common in industrial settings, and (b) the widely employed open-loop method. Leveraging MATLAB/Simulink, simulations have been performed to compare the performance of three-level and five-level inverter configurations. To quantify the harmonic content, a comprehensive analysis of total harmonic distortion (THD) has been conducted. The study further incorporates the concept of electric vehicles (EVs), exploring how the proposed control strategy could enhance the performance and efficiency of EV drives.
Venue: Hyderabad
Institute: Gokaraju Rangaraju Institute of Engineering & Technology, Hyderabad, Telangana
Date: July 31 – Aug 03, 2024
Real Time Implementation of Buck Converter using Optimized Type Compensators
Abstract: This work investigates the application of Artificial Bee Colony (ABC) optimization for the design of Type compensators utilizing the dual-loop control scheme. The proposed Type compensators integrate the ABC optimization for regulating the closed-loop operation of a DC-DC buck converter. Such an integration of ABC optimization, aids in effectively regulating the output voltage and inductor current, besides ensuring enhanced time domain criteria. The proposed dual-loop control scheme consists of a current loop and a voltage loop. The current loop regulates the inductor current and the voltage loop regulates the output voltage.The efficacy of the proposed method is revealed through extensive simulation and experimental investigation under start-up response, step perturbations in external load. The experimentation is conducted on a laboratory prototype using dspace DS1104 control board.
Venue: Hotel Plaza, Begumpet, Hyderabad
Institute: Gokaraju Rangaraju Institute of Engineering & Technology
Date: July 31 – Aug 03, 2024
Independently controllable single-input dual-output DC-DC converter for DC microgrid based PV fed EV charging stations
Abstract: A new non-isolated single-input dual-output (NISIDO) DC-DC converter is proposed in this paper. The converter has the advantage of incorporating multiple outputs for energy storage applications, applicable in DC micro-grid storage systems, Electric vehicular charging stations, battery converters, and renewable energy systems without a filter capacitor. The significant advantage of the converter is it uses the interleaving technique to incorporate the outputs. The voltage stress across the switches and capacitor voltage stress is also reduced drastically. Thus it reduces the capacitor size when compared with the conventional boost converter. A closed-loop control strategy is implemented to control the load voltage as well as the inductor current. The converter is designed, analyzed, implemented, and tested using MATLAB SIMULINK software for 150W. The Simulation results are presented under various operating conditions such as changes in load with solar PV systems. The results from real-time testing are presented with the OPAL-RT system.
Venue: Hotel Plaza, Hyderabad
Institute: Gokaraju Rangaraju Institute of Engineering & Technology, Hyderabad
Date: Aug 03, 2024
A Novel Zero Voltage Switching Full Bridge Converter for Multiple Load Battery Fed LED Driver Applications
Abstract: A novel zero-voltage switching full-bridge (NZVSFB) converter designed for multiple load LED driver applications is introduced in this paper. Four LED lamps are involved in this configuration, with Lamp-2, Lamp-3, and Lamp-4 being powered by a full bridge converter, and Lamp-1 being directly connected in series with the battery source. The efficiency of the system is increased since the power provided to lamp-1 comes directly from a battery source, eliminating the need for any power processing stage. The major claims of the proposed NZVSFB converter are low component count/lamp, enhanced efficiency, zero voltage switching (ZVS) of all the switching devices, ripple free current and equal current sharing. The interleaved technique utilized in inductor design aims to mitigate the adverse effects of ripple currents on LED performance and circuit reliability by reducing their magnitude and ensuring more stable operation. The steady state operation of the proposed NZVSFB converter is discussed in detail and the effectiveness of the circuit is verified in MATLAB Simulink environment.
Venue: Hotel Plaza, Hyderabad
Institute: Gokaraju Rangaraju Institute of Engineering & Technology, Hyderabad
Date: Aug 03, 2024
Small Signal Modelling and Load Regulation Analysis of Capacitor Current Ripple Controlled Coupled Inductor SIDO Buck Converter
Abstract: As the capacitor current can respond to load fluctuations more rapidly than the peak inductor current, incorporating the capacitor current into the current control loop enhances the transient response in DC-DC converters as well as ensures over-current protection and noise immunity. This paper presents a comprehensive small-signal model (SSM) for a capacitor current ripple controlled (CCR) coupled inductor single-input dual-output (CI-SIDO) buck converter. The complete SSM is derived by unifying the developed SSM of the CCR controller with the SSM of the considered power converter using state-space averaging technique. In CCR control, the amalgamation of the comparator and SR flip-flop is accountable for producing the duty cycle. The proposed SSM is of immense usefulness in designing the outer loop controller, deriving switching instability conditions, and analysing the dynamic characteristics of the capacitor current controlled CI-SIDO buck converter. To evaluate the advantages of this current controller to CI-SIDO buck converter, a load regulation analysis using the SSM of CCR controller is provided and thereafter verified through simulations in MATLAB/Simulink. It is observed that the low frequency gain of the cross and self-regulation transfer functions is substantially less signifying promising dynamic and load disturbance rejection capability of the CCR control driven CI-SIDO buck converter.
Venue: The Plaza, Begumpet, Hyderabad
Institute: Gokaraju Rangaraju Institute of Engineering and Technology (GRIET)
Date: July 31 - Aug 03, 2024
Control Implementation of BKY Converter for EV Applications
Abstract: This paper proposes BKY converter, which is made to run in continuous conduction mode during both the charging and discharging cycles for low power EV applications. An analysis is conducted on the converter's dynamic behaviour, and an approach to control is put forth to manage the power transfer between the traction system and battery in an electric vehicle. The suggested converter is designed using an extracted small-signal model. A significant ripple in the detected current causes switching instability in the current-mode control approaches at low duty ratios. The lowpass filter in the proposed average current mode control is positioned in the current loop's feedback to suppress any high-frequency ripples. A computation delay occurs when the controller is implemented in the microcontroller. The control algorithm's design takes this into account. A theoretical framework for current and voltage loop gain transfer functions are created using the realistic parameters of a BKY converter. Further, transient analysis is performed and validated by simulations.
Venue: Hotel Plaza, Begumpet, Hyderabad
Institute: Gokaraju Rangaraju College of Engineering and Technology
Date: July 31 - Aug 03, 2024