College of Engineering, Pune

About: College of Engineering, Pune is a based out in . It is known for research contribution in the topics: Sliding mode control & Control theory. The organization has 4264 authors who have published 3492 publications receiving 19371 citations. The organization is also known as: COEP.

Disturbance observer based speed control of PMSM using fractional order PI controller

Abstract: In this paper, fractional order PI ( FOPI ) control is developed for speed control of permanent magnet synchronous motor ( PMSM ). Designing the parameters for FOPI controller is a challenging task, especially for nonlinear systems like PMSM. All three PI controllers in the conventional vector controlled speed drive are replaced by FOPI controllers. Design of these FOPI controllers is based on the locally linearized model of PMSM around an operating point. This operating point changes with the load torque. The novelty of the work reported here is in use of Non Linear Disturbance Observer ( NLDO ) to estimate load torque to obtain this new operating point. All three FOPI controllers are then designed adaptively using this new operating point. The scheme is tested on simulation using MATLAB / SIMULINK and results are presented.

An overview of DC-DC converter topologies and controls in DC microgrid

Abstract: DC Microgrid has a promising future due to its better compatibility with distributed renewable energy resources, higher efficiency and higher system reliability. This paper presents a comprehensive literature review of DC-DC Converters topologies used in DC Microgrids. The advantages and limitations of classical and recent converter topologies are discussed. The Hierarchical Control Strategies-Primary and Secondary controls have been reviewed. Primary control relies only on local measurements used for proper load sharing among converters. Secondary control is a coordinated control with some form of communication for additional functionalities. A brief note on protection and the key challenges faced in DC Microgrid operation have also been discussed. This paper gives a brief idea about the recent developments and overall operation of DC Microgrid.

Frequency and pattern reconfigurable rectangular patch antenna using single PIN diode

Abstract: The paper presents the design of a frequency and pattern reconfigurable rectangular patch antenna using a single PIN diode switch. The use of single PIN diode reduces the complexity of the biasing network required for the diode. The proposed antenna can work in two different modes and resonates at 2.47 GHz, 3.8 GHz, and 5.36 GHz with the capability to change the radiation pattern. In this design biasing lines required for biasing of the diode are placed away from the radiating structure and the pattern search algorithm is used for the optimization of antenna feed for achieving impedance matching. These are the two improvisations made in the presented design as compared to the existing designs in literature.

A comparative study of cluster based outlier detection, distance based outlier detection and density based outlier detection techniques

Abstract: As there is an increasing demand of data, outlier detection is coming across as a popular field of research. Outlier is stated as an observation which is dissimilar from the other observations present in the data set. It is advantageous in the fields like medical industry, crime detection, fraudulent transaction, public safety etc. Outlier can be learnt in different fields like big data, time series data, high dimension data, biological data, uncertain data and many more. Most of the time 10% of the whole sample data set is incorrect, not accessible or missing sometimes. This paper studies and compares the popular outlier detection algorithms namely, Cluster based outlier detection, Distance based outlier detection and Density based outlier detection. Comparative study of these outlier detection techniques is performed to find out most efficient outlier detection method for calculation of the outlier.