Volume 6 | Issue 1 |

 Abstract

The renewable energy resources like wind, solar, hydro, biomass etc. are required for sustainable growth and social progress, it is essential to meet the energy need by utilizing the renewable energy resources. The necessity of integrated renewable energy like wind energy into the power system is to make it possible to minimize the environmental impacts. This project proposes the STATCOM control scheme for grid connected wind energy system for power quality enhancement. A bang-bang controller which is based on hysteresis current control scheme is developed for STATCOM. STATCOM is connected at a point of common coupling (PCC) to mitigate the power quality problems. The STATCOM control scheme applied for the grid connected wind energy generation system (WEGS) used for enhancement of power quality is simulated using MATLAB/SIMULINK in power system block set. This proposed scheme assures the enhancement of power quality in a generated output.

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 Keywords

FACTS devices, Power quality issues, STATCOM, Wind turbine, Point of Common Coupling

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The main aim of project is to improve the power quality in distribution system by using facts device with SMES unit. In existing system SMES unit is proposed to improve the dynamic performance of a wind energy conversion system equipped with DFIG during voltage sag and voltage swell events. The converter and the chopper of the SMES unit are controlled using a hysteresis current controller and a fuzzy logic controller, respectively. In proposed system a 12-pulse based Static Synchronous Series Compensator (SSSC) with and without Superconducting Magnetic Energy Storage (SMES) for enhancing the voltage stability. The Control scheme for the chopper circuit of SMES coil is designed. A three area system is taken as test system and the operation of SSSC with and without SMES is analyzed for various transient disturbances in MATLAB / SIMULINK environment.

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 Keywords

Smes

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Indeed, it is undoubtedly accepted that the presence of SPV (solar photovoltaic) module is ubiquitous. The power voltage characteristic of photovoltaic (PV) module operating under partial shading conditions, under different tilt angles the output power obtained will be varied. In this paper a new method of obtaining maximum power by using bypass diode is implemented on a PVTR (photo voltaic trainer research system), such that uninterrupted output power can be achieved. The experimental results verify that the output power is varied with the varying of panel cells that are under shading area and with the change in the angle. Compared to many ways of studying the performance of a SPV module at different places, It is very convenient to study the effects that impact the electrical parameters which can be observed on a single equipment at one place named as standalone PVTR system

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 Keywords

PVTR system, PV module, Bypass diode, partial shading, Pyranometer

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 Abstract

This paper deals with study of three phases Nineteen Level inverter fed induction motor drive. The nineteen levels are realized by cascading Two H- Bridges. The poor quality of voltage and current of a conventional inverter fed induction machine is due to the presence of harmonics and hence there is significant level of energy losses. The Multilevel inverter is used to reduce the harmonics. The inverters with a large number of steps can generate high quality voltage waveforms. The higher levels can follow a voltage reference with accuracy and with the advantage that the generated voltage can be modulated in amplitude instead of pulse-width modulation. The CHB topology consists of several H- bridges and dc sources. This topology is implemented to three-phase system. In the symmetric structure, the values of the dc voltage sources are same. However, in asymmetric topology the magnitudes of the dc voltage sources are unequal. Asymmetric CHB topology generates a large number of levels for the same number of components in comparison with symmetric topology for the same number of power electronic components. For asymmetric inverters, a new structure has been recommended in, which reduces the number of switches and dc voltage sources compared with the CHB inverter. However, for creating a large number of output. Multilevel inverters with more number of levels can produce high quality voltage waveforms. In this concept three-phase is used instead of single-phase and implemented for nineteen levels, which can generate a large number of levels with reduced number of IGBTs, gate driver circuits and diodes. A comparison is presented between proposed multilevel inverter and conventional cascade topology.

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 Keywords

Induction motor, Matlab/simulink, Multilevel inverters, voltage source invert and, Total Harmonic distortion

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 Abstract

The continual rise in electricity demand, combined with serious environmental problems created by traditional energy systems have been driving societies towards the use of renewable energy sources. However, the natural variability of some renewable sources due to their strong dependence on the weather conditions result to a high fluctuated output power, which impacts on the local loads that are sensitive to pulsating power. Hence, there is a need to support these sources by use of energy storage device, where it either injects its stored energy or absorbs the excess energy during the transients in the renewable source; resulting in a smooth output power to the load. In this paper, the control of a bidirectional converter to interface an ultra capacitor as storage device to renewable energy systems is discussed. The controller of the converter system has been designed and simulated based on the integration of both Current Mode Control (CMC) and Linear Quadratic Regulator (LQR) methods. The controller performance is tested under different modes of operating conditions in bidirectional converter using MATLAB/Simulink simulation.

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 Keywords

DC-DC converter, ultra capacitor, buck mode converter, boost mode converter, current mode control (CMC), linear quadratic regulator (LQR) control

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 Abstract

Small–Signal Stability Analysis of Grid Connected Type–A, Type–C and Type–D Wind Power Plants

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 Keywords

Power System Analysis Toolbox (PSAT), Small-Signal Stability, Type-A WPP, Type-C WPP, Type-D WPP, Wind Penetration Level and Wind Power Plant (WPP)

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A bidirectional ac–dc con- verter is proposed for a 380-V dc power distribution system to control bidirectional power flows and to improve its power con- version efficiency. To reduce the switches’ losses of the proposed non isolated full-bridge ac–dc rectifier using a unipolar switching method, switching devices employ insulated-gate bipolar transistors, MOSFETs, and silicon carbide diodes. Using the analysis of the rectifier’s operating modes; each switching device can be selected by considering switch stresses. A simple and intuitive frequency detection method for a single-phase synchronous reference frame-phase-locked loop (SRF-PLL) is also proposed using a filter compensator, a fast period detector, and a finite impulse response filter to improve the robustness and accuracy of PLL performance under fundamental frequency variations. In addition, design and control methodology of the bidirectional full-bridge CLLC resonant converter is suggested for the galvanic isolation of the dc distribu-tion system. A dead-band control algorithm for the bidirectional dc–dc converter is developed to smoothly change power conversion directions only using output voltage information. Experimental results will verify the performance of the proposed methods using a 5-kW prototype converter.

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 Keywords

AC–DC boost rectifier, bidirectional isolated con- verter, CLLC resonant converter dc distribution system.

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This paper presents the Modelling and simulation of variable speed wind turbine driven permanent magnet synchronous generator (PMSG) connected to grid through matrix converter (MC). MC is used to convert three phase ac variable frequency variable rotor voltages into constant frequency ac voltage. Modelling of PMSG is done using its dynamic equations and then MC is integrated for the direct conversion to constant frequency, variable voltage output. A normal voltage oriented vector control approach with proportional and integral (PI) is employed to track the maximum power from wind and regulate the active and reactive power injected into the power grid. Simulation results obtained using MATLAB /Simulink prove the performance of the proposed system for different generator output powers.

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 Keywords

wind turbine; permanent magnet synchronous generator; Matrix Converter; Mathematical model

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The main aim of this project is a control strategy for power flow management of a grid-connected hybrid PV-wind-battery based system with an efficient multi-input transformer coupled bidirectional-dc converter is presented. The proposed system aims to satisfy the load demand, manage the power flow from different sources, inject surplus power into the grid and charge the battery from grid as and when required. A transformer coupled boost half-bridge converter is used to harness power from wind, while bidirectional buck-boost converter is used to harness power from PV along with battery charging/discharging control. A single-phase full-bridge bidirectional converter is used for feeding ac loads and interaction with grid. The proposed converter architecture has reduced number of power conversion stages with less component count, and reduced losses compared to existing grid-connected hybrid systems. This improves the efficiency and reliability of the system.

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 Keywords

PV, DC-DC Converter, Battery, Wind, Hybrid system, MPPT

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 Abstract

In the present scenario, Induction motors are the most consistently used motors in present day development control structures. Induction motors are the most usually utilized motors in mechanical movement control frameworks. Prior, the nature of modern uses of the induction motors were of constant speed mechanical drives because of troublesome speed control frameworks however the current headway in power electronics segments have prepare for the improvement of power electronics based variable speed induction motor drives supplanting dc drives. The slip power recovery scheme including Static Scherbius Drive gives speed control of slip ring induction motor beneath synchronous speed. The slip power recovery drives is utilized as a part of vast limit pumps and fan drives, variable speed wind vitality frameworks, shipboards VSCF (variable-speed/constant frequency) frameworks, variable-speed hydro pumps/generators, utility framework flywheel vitality stockpiling frameworks and so forth. In this paper different power quality issues made by utilization of power electronics segments in this scheme and their cures have been talked about. This study paper will give the understanding of patterns and advances utilized as a part of slip power recovery scheme. And the Slip control recovery plot including Static Scherbius Drive gives speed control of slip ring induction motor underneath synchronous speed. Slip Power Recovery Framework (SPRS) innovation is ending up progressively critical to accomplish productive use of vitality with regards to vitality preservation and condition assurance. Slip ring induction motors are utilized as a part of different industry portions like Cement, Metals and water and Waste water treatment, and so on. Customarily, speed control of slip ring induction motor was accomplished through fluctuating the rotor protection. Persistent power streaming to the rotor resistor is an impressive warmth misfortune. SPRS is an outside framework associated with the rotor circuit giving amazing torque and speed control and furthermore recoups power from the rotor and sustains back to the power framework, staying away from wastage of vitality. This framework is appropriate for any new establishment and retrofits. SPRS offers the most ideal answer for customizable speed applications with constrained speed go. The Inverter is associated with rotor winding and the converter is associated with the power framework. The transformer is utilized to coordinate the framework voltages. The inverter control regulates the measure of power nourished once again into the power framework, permitting control of motor speed. The consequences of simulation are considered, broke down and looked at. It has been seen from the simulation comes about that the power factor and productivity of the slip power recovery scheme utilizing inverter with chopper has preferred esteems over the slip power recovery scheme.

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 Keywords

Slip power recovery system, Inverter and Induction motors

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