Informatics Publishing Limited

Chintalapudi V. Suresh ¹, M. S. Giridhar ², S. Sivanagaraju ³, U. Ramanaiah ⁴

Affiliations
1 Department of EEE, Vasireddy Venkatadri Institute of Technology, Guntur – 522508, Andhra Pradesh, IN
2 Department of EEE, Lakireddy Bali Reddy college of Engineering, Mylavaram, Vijayawada – 521230, Andhra Pradesh, IN
3 Department of EEE, UCEK, JNTUK, Kakinada – 533003, Andhra Pradesh, IN
4 EEE, Vasireddy Venkatadri Institute of Technology, Guntur – 522508, Andhra Pradesh, IN

Abstract

Objectives: This paper presents a two stage solution strategy to solve multi objective optimization problem in the presence of Distributed Generators (DG) in planning a primary distribution system. Methods/Statistical Analysis: Using this, the economical aspects such as net savings and the technical aspects such as voltage deviation and section current index objectives are optimized while satisfying system equality and in-equality constraints. The optimum number of DGs and its optimal locations are identified in a given system so as to enhance the system security by minimizing the system power losses. The proposed methodology uses fuzzy decision approach to select the best compromised solution from the total generation Pareto solution as per the operators' requirement. Findings: According to the analytical results, the proposed framework in the presence of DGs enhances the system performance more effectively. Application/Improvements: The feasibility and effectiveness of the proposed method are examined on standard 15-node, 33-node and 69-node test systems.

Keywords

Effect of Distributed Generators, NSMCSA, Optimal Placement, Savings, Section Current Index, Voltage Deviation.

Full Text

   

J. John ¹, V. Thamarai ¹, M. M. Mehra ¹, Teena Choudhary ¹, M. S. Giridhar ¹, Ashwini Jambhalikar ¹, Gogulapati Supriya ¹, Gaurav Saxena ¹, K. V. Shila ¹, B. Ramesh ¹, T. K. Pratheek ¹, Deepak Kumar Sharma ¹, R. Islam ¹, P. Selvaraj ¹, A. Kalpana ¹, S. Ajith Kumar ¹, K. V. Sriram ¹, A. S. Laxmiprasad ¹

Affiliations
1 Laboratory for Electro-Optics Systems, Indian Space Research Organisation, Peenya 1st Stage, 1st Cross, Bengaluru 560 058, IN

Abstract

Instrument for Lunar Seismic Activity Studies (ILSA) is a science payload with the objective of studying seismic activities at the landing site of Vikram, the Lander of Chandrayaan-2. ILSA will be deployed to the lunar surface by a specially built mechanism. It is an indigenously developed instrument based on microelectro mechanical systems technology. High sensitivity silicon micro-machined accelerometer is the heart of the instrument that measures ground acceleration due to lunar quakes. The instrument has the capability of resolving acceleration better than 100 nano-g Hz^–1/2 up to a range of 0.5 g over bandwidth of 40 Hz. This paper presents the basic concepts in the design, realization, characterization and the performance test results of the space qualified strong motion seismic sensors.

Keywords

Lunar Quakes, MEMS, Seismometer, Strong Motion Sensors.

Full Text

   

B. Anitha ¹, Supriya Gogulapati ¹, Deepak Kumar Sharma ¹, J. John ¹, M. S. Giridhar ¹, Ashwini Jambhalikar ¹

Affiliations
1 MEMS Development Division, Laboratory for Electro-Optics Systems (LEOS), ISRO, Bangalore, IN

Abstract

The paper presents the simulation studies for the design of a miniaturized Quadrupole Mass Filter (QMF) based on silicon micromachining technology. Mass spectrometers operating in the range of 1 to 100 amu with the resolution of 1 amu are very useful for science payloads in space missions. The mass filtering action of ions in a filter of length 30 mm with electrodes of radius 250 μm is simulated by standard tools. The complete transmission of ions is examined for various Mathieu parameters which are used to define the operating potentials at the electrodes. The performance parameters namely resolution, mass range and the required design considerations such as initial ion velocity, DC and RF voltages and RF frequency are obtained through the model and the computational program using Mathematica. For the efficient ion transmission, an electrostatic slit with aperture of radius 70 μm is placed before the MEMS QMF. Further, the effects of quadrupole length, focusing voltage and the aperture size on the transmission probability of ions are analyzed.

Keywords

MEMS Technology, Quadrupole Mass Filter, Mathieu Equation, Resolution.

Full Text