Sameer Usman Bagwan

Bio: Sameer Usman Bagwan is an academic researcher from Techno India. The author has contributed to research in topics: Static VAR compensator & Thyristor. The author has an hindex of 2, co-authored 6 publications receiving 10 citations.

Performance investigation of static var compensator (svc) with thyristor binary compensator at 500 kva distribution transformer

Abstract: The electrical distribution systems are consists of large losses as the loads are wide spread, less effective reactive power compensation facilities and their improper control which results in ineffective utilization of electrical energy. In solution of that the investigation is carried on static VAr compensator (SVC) with thyristor binary compensator. The work deals with the analytical studies and implementation of simulation model of static VAr compensator (SVC) at 3Φ, 50Hz, 11kV/440V, DY-11, 500 kVA distribution transformer. The SVC consisting of thyristor switched capacitor bank in binary sequential steps in conjunction with smallest step size thyristor controlled reactor. This compensation technique facilitates control on the reactive power depending on load requirement so as maintain power factor near unity always, which results in efficient electrical power system.

Implementation of digital static var compensator (svc) with thyristor binary compensator at 2 kva transformer

Abstract: Electrical distribution systems are incurring large losses as the loads are wide spread, inadequate reactive power compensation facilities and their improper control. In solution the experimental studies of static VAr compensator (SVC) with thyristor binary compensator is carried out. The work deals with the performance evaluation through analytical studies and implementation of hardware circuit model of SVC at single phase, 50Hz, 2kVA transformer. The SVC consisting of thyristor switched capacitor bank in binary sequential steps. This compensation technique facilitates control on the reactive power depending on load requirement so as maintain power factor near unity always, which results in efficient electrical power system.

Harmonic mitigation by shunt passive power filter at voltage source type non-linear load

Abstract: The harmonic distortion is a very sensitive issue for all power consumers, causes ill-effects such as an increase in loss and current and thereby reduce the life of equipment. The non-linear loads such as be personal computers, automatic machines, adjustable speed drives, lighting ballasts and other power electronic equipment are the main sources of harmonics. In this work, the harmonic mitigation was done of a computer laboratory by shunt connected tuned passive filters. Computer loads contains a switched-mode power supply (SMPS) in the system that generates harmonics at the input side of power supply due to non-sinusoidal current. The simulation work was carried out by modeling personal computer load and single tuned passive filter designed by equal and unequal method. The attractive results for harmonic reduction has been observed. Design of shunt passive power harmonic filters by using equal and unequal branch VAR can be a simple and cost-effective technique for the mitigation of harmonics.

Analysis and Application of Zigzag Transformer in Distribution System for Mitigation of Triplen Harmonics

Abstract: The three-phase four wires low voltage supply system to residential, commercial and production areas in the distribution system is implemented. The different nature of loads connected to the three-wire four-phase distribution system. It can be personal computers, automatic machines, variable speed drives, lighting ballasts and other electronic power equipment, which may produce a nonlinear characteristic cause zero sequence current to flow in the system in the neutral of supply system. This may cause a serious power quality problems, results in reduction. This paper present to reduce the harmonics currents and neutral overloading by using the zigzag transformer. The zigzag transformer is one of the solution to attenuate the neutral current and reduce the zero sequence harmonic currents of the distribution systems.

A solution of power quality issues by adaptive FACTS controller: A modelling and simulation

Abstract: The Static Var Compensator (SVC), a first generation FACTS controller is taken up for study. It is a variable impedance device where the current through reactor is controlled using bidirectional thyristor valves. The application of SVC is initially for load compensation of fast changing loads. Here the objective is to provide dynamic power factor improvement and also balance the currents on the source side whenever required. The work deals with the analytical studies, modeling and simulation of SVC to make it possible competent compensator of current generation. The investigation is carried out on different configuration of SVCs. The result of that thyristor binary compensator (TBC) type of thyristor switched capacitor (TSC) in conjunction with smallest step size thyristor controlled reactor (TCR) configuration turn out to be best solution over major power quality issues.

Alleviation of Voltage Sag-Swell by DVR Based on SVPWM Technique

Abstract: Now a day, Electricity consumer demands reliable and qualitative power supply from distribution utilities due to increased use of nonlinear loads These nonlinear loads cause power quality disturbances In industrial plants many electrical and electronic devices are sensitive to the voltage sag The voltage decrease is a frequent and significant issue of power quality, which has received a lot of attention There's many numerous custom control devices available, to offset power quality disturbances Among which dynamic voltage restorer (DVR) is most effective and promising Flexible ac transmission system (FACTS) Device In this article a claim is performed with total harmonic distortion (THD) in load voltage when using MATLAB / SIMULINK to apply Sinusoidal PWM (SPWM) and Space Vector PWM (SVPWM) techniques to an inverter The simulation results demonstrate that the comparison against SPWM and SVPWM offers greater efficiency

Energy audit: types, scope, methodology and report structure

Abstract: The objective of this paper is to study various methods adopted during the energy audit. Many countries are focusing on energy, not only enhancing the tenable power generation sources but also on utilizing the power more proficiently for economic utilization. The energy audit is an important parameter for all the developing and developed countries and they focus on energy efficiency, energy quality, and energy intensity. In the industrial, residential, and commercial sectors the top operating expense is found to be are material, machine, manpower, and energy. Identification of the energy-consuming sector is the prior attention to look for the energy-saving potential and quality improvement. Implementation of an energy audit can enhance the efficiency, quality of power, reduce the tariff of bills, and reduces the wastage of energy. The need for energy audits, different types of energy audits, various types of software used, and the energy audit report structure were presented in this paper.

Reduction of harmonics generated by thyristor controlled reactor for RL loads

Abstract: The harmonics are considered a problem for power system. The problem is present when Thyristor Controlled Reactor (TCR) is used as a poor factor correction technique. This paper gives a study for reduction of harmonics which produce from TCR. Actually, the TCR system is not exist as a standalone compensator but combined with other configuration such as Fixed Capacitor (FC), Thyristor Switching Capacitor (TSC), Mechanically Switched Capacitor (MSC), and the filter. The model in this paper consists of a TCR combined with a FC. The model of TCR may be connected in star, delta, and hybrid. Sources of regular and irregular harmonics will be discussed. Many techniques will be introduced for reducing the harmonics. 12-pulse technique (Hybrid) is shown as one effective method to suppress that harmonics. The simulation result will be displayed for RL load at the different topologies of the TCR under condition keeping the same rating for the reactive power of TCR.

Comparison of Analytical Method and Different Finite Element Models for the Calculation of Leakage Inductance in Zigzag Transformers

Abstract: A zigzag transformer is a key segment of the electric power system. The optimal design of the zigzag transformer is important for transformer designers to provide a required return path for earth faults and to ensure proper operation of a power system. The two most important parameters of the zigzag transformers are no-load losses and leakage impedance. The accurate calculation of both factors helps to minimize the overall cost of the transformer. Therefore, the prediction of leakage reactance in the zigzag transformer using analytical or numerical methods is an essential part of the early designing stages of the transformer. This paper provides several two- and three-dimensional finite element models. The main purpose of these models is to evaluate the accuracy of the different models for the calculation of the leakage reactance. An analytical formula and a complete procedure for the calculation of the leakage reactance in the zigzag transformer are also provided, which will help the researchers and transformer designer to optimize this type of transformer. The prototype is also manufactured and tested to verify the accuracy of the analytical method and finite element models for the calculation of the leakage reactance. The simulation and experimental results show that the finite element calculation cannot only obtain accurate leakage reactance values (magnetostatic analysis), but also provides better accuracy in the no-load losses (transient analysis).

A Matlab-Simulink model of network reactive power compensation based on binary switchable capacitors and thyristor-controlled reactor

Abstract: This paper considers a Matlab-Simulink Model of a system for a load reactive power compensation with consisting of a thyristor-controlled binary switched capacitors (TBSC) and a thyristor controlled reactor (TCR). The capacitors ensure stepwise compensation of reactive power, while the controlled inductance makes it possible to achieve smooth changing of the resulting compensating power within the limits of the minimal capacity in the binary capacitors series. The model uses a very simple algorithm of capacitor control, provided with a logical system that prevents current surges in the moments when capacitors are being connected to the network. The switching of capacitors is set by a closed system for maintenance of the maximal power coefficient. To regulate the inductance in TCR, an invariant system of phase control is used, which maintains the unit value of the power coefficient in the network irrespective of load changes. The realization of the system in the model is maximally close to its possible hardware realization. The functioning of the model has been tested in a wide range of variation of the reactive load power, and the testing confirmed the efficiency of combining a switchable series of binary capacitors and a thyristor-controlled inductance when using the proposed control algorithms.