Informatics Publishing Limited

S. Ramya ¹, T. Manokaran ², V. Rajasekaran ³

Affiliations
1 Department of Electronics and Communication Engineering, V.S.B Engineering College, Karur, IN
2 Department of Electrical and Electronics Engineering, Sri Subramanian College of Engineering and Technology, Sukkamanaikanpatti, Palani, Dindigul, IN
3 Department of Electrical and Electronics Engineering, PSNA College of Engineering and Technology, Dindigul, IN

Abstract

Distribution system, as the name suggest, is the medium through which power is distributed among the end consumers Distribution systems are comparatively not as stiff as grid systems, so large starting currents and objectionable voltage drop during the starting of an induction motor could be critical for the entire system. Thus STATCOM is an effective solution for power systems facing such power quality problems. This report deals with one of the potential applications of static compensator (STATCOM) to industrial systems for mitigation of voltage dip problem. The dip in voltage is generally encountered during the starting of an induction motor. The model of STATCOM connected in shunt configuration to a three phase source feeding dynamic motor loads is developed using Simulink of MATLAB software. Simulated results demonstrate that STATCOM can be considered as a viable solution for solving such voltage dip problems. This thesis work aims at developing a STATCOM for induction machines with reduced voltage dip.

Keywords

Custom Power Devices, STATCOM, DSTATCOM, Induction Motor Drives.

Full Text

     

V. Rajasekaran ¹, M. Suganya ²

Affiliations
1 PSG College of Arts & Science, IN
2 MCA, PSG College of Arts & Science, IN

Abstract

Implementing cloud computing in an venture infrastructure bring significant security concerns. Successful deploying  of cloud computing in an enterprise requires proper planning and understanding of emerging risks, threats, vulnerabilities, and possible countermeasures .Cloud Computing is efficient in cost, flexible and proven delivery platform for providing consumer IT services or business over the Internet. Still, cloud Computing presents an additional level of risk because essential services are often outsourced to a third party, which makes it harder to maintain support data and service availability ,data security and privacy and demonstrate its compliance. It leverages have  many technologies (Web 2.0,SOA,virtualization); it also inherits their security issues, identifying the Major vulnerabilities in this kind of systems and the most important threats found in the literature related to Cloud Computing and its environment as well as to identify and relate  the vulnerabilities with threats and also to give  possible countermeasures for that.

Keywords

Cloud Computing, Vulnerabilities, Security, Threats.

Full Text

     

N. Panneer Selvam ¹, V. Rajasekaran ², N. Jayanthi ¹

Affiliations
1 V.S.B Engineering College, Department of Electrical and Electronics Engineering, Karur–639111, Tamil Nadu, IN
2 PSNA College of Engineering and Technology, Department of Electrical and Electronics Engineering, Dindigul-624622,Tamil Nadu, IN

Abstract

Objectives: This paper proposed to enhance the performance of Direct Torque Control (DTC) of CSI fed IPMSM drive with online stator resistances estimation of using PI controller. Methods/Analysis: Direct Torque Control (DTC) CSI fed IPMSM drives have widely used because of its high dynamic performance and no position sensor requires. This scheme is need less parameter to estimate of motor torque and stator flux linkages by using the stator quantities such as voltage and current. The estimation is dependent only the machine parameter such as stator resistance. Findings: At low speed operation the stator resistance is varying due to temperature and frequency which degrade the system performance by introducing errors in flux linkage and motor torque during estimation. Hence the stator resistance compensation is essential at low speed. The error between estimated stator flux and its reference value are used to estimate the stator resistance by using PI controller. For the first time, it is demonstrated in this paper for DTC with CSI fed IPMSM drive system. Conclusion/Application: It is demonstrated for the first time for DTC with CSI fed IPMSM drives. The performance of the stator resistance estimators and torque and flux responses of the drive are investigated with the help of MATLAB/SIMULINK software and hardware. The results show that the proposed methods ensure the reliable and high-performance operation of the drive.

Keywords

Current Source Inverter, Direct Torque Control, IPM Synchronous Motor, PI Controller, Stator Resistance Compensation

Full Text