Prafulla Chandra Panda

Analysis of voltage and loss profile using various FACTS devices

The Aim of this paper is the study of models and procedures with which we assess the steady-state operation of electrical power systems at the fundamental frequency. The improvement of stability will be achieved by controlling the reactive power flow in the line [3]. The Flexible Alternating Current Transmission System (FACTS) devices have been proposed to control the power flow in transmission lines & to regulate the bus voltages in electrical power systems resulting in an increased power transfer capability, less system losses and improved stability[8]. This summary presents the implication of adding various FACTS controllers such as a Static Var Compensator SVC, TCSC(thyristor controlled series capacitor) and UPFC(Unified power flow controller) etc. So a power flow program using MATLAB finds the steady voltage and angle at each bus and corresponding for a given system and finds the load ability margin of power system with FACTS devices. A 2 machine 5 bus system is considered for performance analysis[9]. This paper states the implementation of FACTS in a Newton raphson load flow(NRLF) method.

Performance evaluation of Sinusoidal current control strategy unified Power Quality Conditioner

This paper focuses on Constant Sinusoidal current control strategy based simulation of UPQC (Unified Power Quality Conditioner). The proposed methodology guarantees sinusoidal current to be drawn from the supply system. In addition to this it compensates the reactive power, for which the compensated current and the source voltage are in phase. In case of non-linear loads connected to the system which draw harmonic power along with constant average power, UPQC is able to supply the harmonic power, so that harmonic components are not drawn from the supply system. The UPQC not only deals with harmonic power of the load but also deals with zero sequence power owing to imbalances in the power system. Simulation studies of UPQC for Three Phase Four Wire system with neutral point clamped topology has been performed using MATLAB R2014b for combination of Linear and non-linear loads. The results of the simulation study reveal that the current obtained from the supply system is apparently sinusoidal with a very low THD (Total Harmonic Distortion) within 0.04 percent.

Voltage stability analysis in a multimachine multibus system using thyristor controlled series capacitor(TCSC)

In recent years a number of FACTS devices have been proposed for better utilization of FACTs Devices for power transmission facilities and these devices have shown better results when used to improve power system stability. Many papers discuss the voltage stability [1] assessment of power system using power flow analysis methods. In this paper, a static voltage stability analysis is done by without and with FACT devices such as by using TCSC, which is aimed at detection of the voltage stability [2]. So a voltage indicator is derived by using Kirchhoffs law from the concerned power system network and From the indicator, voltage instability and voltage collapse can be predicted.

A fault detection technique in transmission line by using discrete wavelet transform

This paper presents a novel technique of fault detection in high voltage transmission lines using the wavelet transform during power swing condition. Recently, many fields has been applied successfully the wavelet transform. This technique is the absolute sum value of coefficients in multi resolution signal decomposition is utilised based on the discrete wavelet transform (DWT). To discriminate between fault and non-fault transient cases like line switching and capacitor and loads in arc furnace, the concept of time duration, i.e. the presence of transient time period. It is shown that the developed technique is robust for different types of fault, fault-inception angle, fault resistance and fault location. This technique is also tested in 3 machine 9 bus power system with different types of fault.

A study on the increasing in the performance of a solar photovoltaic cell during shading condition

This paper proposes a special type of converter with solar photovoltaic cell for extracting maximum amount of power from a variable source. The converter topology uses a special characteristics which enables it to extract maximum power from the source. Partial shading is a very critical problem which sometimes leads to permanent damage of the cell. This effect also reduces the system performance and efficiency.

Power system oscillation damping with adaptive unified power flow controller

In the family of FACTS devices The unified power flow controller is treated as a most powerful device which increase the transient stability of the system. a suggested controller is used here which can eliminate the disadvantages of the conventional controllers generally used in power system stability and give the better dynamic characteristics. The novel approach proposed here includes developing a non-linear dynamic approximation of the power network, using a unified power flow controller as a controller, augmenting the unified power flow controller with non-linear adaptive control based on back-stepping for oscillation damping, and using an adaptive control law to approximate uncertain parameters that contribute significantly to the stability of the power system. The feasibility of the proposed technique is validated using simulation on a single-machine to infinite-bus system.