Subhranshu Sekhar Dash

A versatile control scheme for UPQC for Power Quality Improvement

The proliferation of power electronics based equipment has produced a significant impact on the quality of electric power supply. Conventional power quality mitigation equipment is proving to be inadequate for an increasing number of applications, and this fact has attracted the attention of power engineers to develop dynamic and adjustable solutions to power quality problems. This has led to development of Custom Power Devices (CPD). One modern and very promising CPD that deals with both load current and supply voltage imperfections is the Unified Power Quality Conditioner (UPQC). This paper investigated the development of UPQC control schemes and algorithms for power quality improvement and implementation of a versatile control strategy to enhance the performance of UPQC. The proposed control scheme gives better steady-state and dynamic response. The validity of the proposed control method is verified by means of MATLAB/SIMULINK

A modified module integrated — Interleaved boost converter for standalone photovoltaic (PV) application

Presently, most of the commercial and industrial sectors are using PV system because of its advantages towards clean and green energy. Subsequently, it is not an ideal power source as it solely depends upon sun light. In the recent past, a lot of research and development has been carried out to enhance the reliability, efficiency and cost effectiveness of power electronics converters in order to increase the conversion efficiency from the PV cells. Thus, this paper presents a modified interleaved Flyback inverter for standalone PV applications. The proposed system is developed by interleaving of three Fly-back cells along with one PV source. The effectiveness of the design have been validated by PV based Fly-back converter simulation model. Also, a real time prototype of the proposed system is built and evaluated under realistic conditions.

Contribution of FACTS devices for VSC-OPF problem using Non- Dominated Sorting Genetic Algorithm -II

Voltage Stability has become an important issue in both planning and opearation of power systems. Contingencies such as unexpected line outages may often result in voltage instability which may lead to voltage collapse. This work presents the application of Non-Dominated Sorting Genetic Algorithm (NSGA-II) technique to find the optimal location of Flexible AC Transmission System (FACTS) device with the objective of minimizing operating cost of the system , installation of FACTS device and to improve the voltage stability of the system. The location and sizing of FACTS controllers for voltage stability enhancement is an important consideration for practical power systems. The placement methodology considers simulataneously the cost of generated active and reactive powers and cost of selected FACTS for a range of operating conditions. FACTS devices -Static VAR Compensator (SVC) is considered. The optimizations are performed on the parameters namely the location of FACTS devices are done by modal analysis and sizing and installation cost of FACTS devices are determined by the proposed algorithm. The Optimal Power Flow (OPF) and NSGA-II based optimization procedure are employed to solve the allocation task. Simulations are performed on IEEE-30 bus test system.

An enhanced methodology for maximum power point tracking in solar powered UPS application

In this paper, an advanced mppt tracking is utilized to extract the maximum power from solar PV array. The tracked maximum voltage is fed to the simple boost converter to increment the voltage. Following the tracking process, the boosted DC voltage is implied for charging portable UPS. In the proposed PV system, the incremental conductance MPPT algorithm is utilized for tracking the maximum power, for UPS applications.

FPGA Implementation of Three Dimensional SVPWM

In this paper includes an approach to implement Three Dimensional Space Vector Pulse width Modulation (3D-SVPWM) for multilevel inverter/Converter. The Proposed 3D-SVM scheme finds the reference vector by using simple mathematical equations for selecting switching states without redundant switching vectors. Moreover, the proposed PWM strategy satisfies the constraint that the output voltage vector should be only changed by one switching action. Not requiring extra hardware, the NPC inverter with the proposed PWM results are remarkable. The proposed algorithm is simulated by MATLAB and Implemented by FPGA-DSP Processor.