iosr-JEEE   Volume-4 ~ Issue-6

Abstract: The Dynamic Voltage Restorer (DVR) is used to regulate the voltage at the load terminals from various power quality problems like sag, swell, harmonics, unbalance etc. in supply voltage. This paper presents modelling aspects of several types of Dynamic Voltage Restorer (DVR) working against various voltage sags by simulation. Dynamic voltage restorers (DVRs) are used to protect sensitive loads from the effects of voltage sags on the distribution feeder. Significant simulation results show that these several types of the modelled device can work very well against balanced and/or unbalanced voltages caused by faults in a distribution system. Detailed analyses illustrate that with suitable parameter setting these devices can deal with different levels of voltage sag severity. In addition, appropriate ways to obtain a good quality output voltage by a DVR during voltage sag is also presented. It then provides analyses of working performance of the device, including capability and quality of compensation.

Index Terms- Dynamic Voltage Restorer (DVR), Balanced and unbalanced faults, Compensation capability, Power quality sag severity, voltage sag.mode control

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Abstract: This paper work is aimed at developing a STATCOM-based control scheme for mitigating source current harmonics in a grid-connected wind generating system. A bang-bang controller which is based on hysteresis current control scheme is developed for STATCOM and the performance of the control scheme is investigated through a test system modeled in MATLAB/SIMULINK platform. Simulation results are presented to demonstrate the impact of integration of wind generating system with the grid and the effectiveness of the STATCOM control scheme in minimizing the impact.FFT analysis carried out for the source current shows that the THD is considerably reduced and is clearly within limits imposed by standards with STATCOM connected at point of common coupling(PCC).

Keywords - Battery Energy Storage System (BESS), Power Quality (PQ), Point Of Common Coupling (PCC) , Wind generating System (WGS), wind turbine generating system (WTGS).

[1] Sharad W. Mohad, and Mohan V. Aware," A STATCOM-control scheme for Grid Connected Wind Energy System for Power Quality Improvement," IEEE SYSTEMS JOURNAL, VOL 4 NO 3,SEP 2010.
[2] H. Hassan .El- Tamaly*, Mohamed A. A. Wahab and Ali H. Kasem, " Simulation of Directly Grid-Connected Wind Turbines for Voltage Fluctuation Evaluation," International Journal of Applied Engineering Research ISSN 0973-4562 Vol.2, No.1, pp. 15–30,2007.
[3] H.M. Abdel_Mageed Sayed, S.M. Sharaf, S.E. Elmasry, M.E. Elharony, " Simulation of a Transient Fault Controller for a Grid Connected Wind Farm with Different Types of Generators", International Journal of Applied Engineering Research ISSN 0973-4562 Vol.2, No.1, pp. 15–30,2007.
[4] Sharad W. Mohad, and Mohan V. Aware," A STATCOM-control scheme for Grid Connected Wind Energy System for Power Quality Improvement," IEEE SYSTEMS JOURNAL, VOL 4 NO 3,SEP 2010.
[5] R.Ganesh.Harimanikyam1, R. Lakshmi Kumari, "Power Quality Improvement of Grid Connected Wind Energy System by STATCOM for Balanced and Unbalanced Linear and Nonlinear Loads," International Journal of Engineering Research and Development,Vol 3, PP. 09-17.Aug 2012.
[6] .R.Ganesh.Harimanikyam1, R. Lakshmi Kumari, "Power Quality Improvement of Grid Connected Wind Energy System by STATCOM for Balanced and Unbalanced Linear and Nonlinear Loads," International Journal of Engineering Research and Development,Vol 3, PP. 09-17.Aug 2012
[7] Sreekanth, N. Pavan Kumar Reddy, "PI & Fuzzy logic based controllers STATCOM for grid connected wind generator", International journal of Engineering Research and Application (IJERA).Vol.2,Issue 5,Sep-oct-2012.
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Abstract: In this paper energy analysis of LVRM actuator is demonstrated. Linear Variable Reluctance Motor Actuator (LVRM) is a modification of Switched Reluctance Motor.The motor with transverse magnetic flux consists of a primary part, which is moving and a secondary part which is stationary and does not have any windings. The motor can operate under AC or DC supply . When supplied from an AC source it must be equipped with a capacitor connected in series with the coil. In this case the motor operates on the basis of resonance in an RLC primary circuit. When supplied from a DC source it must be equipped with a controlled switch connected to the primary circuit.Design calculations were focused on determining the resistance, the inductance and the mass of the primary part .The concept of Co-Field energy ,is also demonstrated .

Keywords: Field Energy,Co-Field Energy, LVRM, Reluctance,SRM

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