Ravishankar A. N., currently serves as Assistant Professor at the Department of Electrical and Electronics Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Amritapuri. Ravishankar A. N. has completed B. Tech. in Electrical & Electronics Engineering from National Institute of Technology Calicut in the year 2007 and  M. Tech. in Computer Controlled Industrial Power from National Institute of Technology Calicut in the year 2010. 








Publication Type: Conference Paper
Year of Conference Publication Type Title
2015 Conference Paper S. M. Ramesh, Smrithi, S., AkhilRajkoti, P., Kanakasabapathy, P., A.N. Ravishankar, Pal, S., and Poornachandran, P., “Development of SCADA automated 33kV substation model as testing platform”, in IEEE International Conference on Industrial Instrumentation and Control (ICIC 2015), Pune, 2015.[Abstract]

This paper discusses construction and testing of a scaled down model of 33 kV substation using SCADA (Supervisory Control And Data Acquisition). The model works as a testing platform for conducting various kinds of automation tests like unscheduled load shedding, time based load shedding, over voltage protection etc. The model provides hands on experience of automation which results in enhancement of control, accuracy, and reliability of the substation. The substation is monitored and controlled using SCADA. The objective of this paper is to demonstrate how to develop an efficient system and using it as a real-world testing platform that enables the collection of right amount of data and relaying it to the controlling utility at right time to take right actions for smooth performance and good efficiency. Also to study the security concerns of the system by modelling the threats associated it.

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2015 Conference Paper S. S. Joshua and A.N. Ravishankar, “Development of utility interactive inverters for controlling renewable energy penetration into grid”, in Proceedings of IEEE International Conference on Technological Advancements in Power and Energy, TAP Energy 2015, 2015, pp. 472-478.[Abstract]

Micro grid consists of a cluster of distributed energy resources (DER) connected at the point of common coupling. Amount of renewable energy penetrated into the grid must be monitored and controlled for the stable and reliable operation of the grid. An efficient communication system interacts between DERS's and the utility substation is required to perform the task. DER inverters are capable of providing real and reactive power support according to the grid requirement. This paper discusses about an efficient control to economically allocate the available DER based on cost analysis. A supervisory price controller (SPC) and a Distributed Energy Resource Controller (DERC) provides the initiation signal to bidirectional voltage source inverter of the selected resource which is then responsible to provide real power support to the AC and DC loads connected to it. Apart from this service, the inverter using the control algorithm also provides reactive power compensation, current harmonics mitigation and load balancing so that the supply currents are always sinusoidal and at unity power factor. Instantaneous Symmetrical Component Theory (ISCT) is used to provide the inverter all these functionalities. The centralized operation of micro grid under varying energy price is demonstrated. A MATLAB/SIMULINK model has been developed and simulation results shows the effectiveness to provide active power and ancillary services according to changing prices due to the coordination between the participating micro resources. © 2015 IEEE.

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2014 Conference Paper K. P. Praveen and A.N. Ravishankar, “Simulation of Hybrid Energy System using Multiple Input DC-DC Converter and Z Source Inverter with Maximum Boost Control Strategy”, in International Conference on Computation of Power, Energy, Information and Communication (ICCPEIC), 2014, Chennai, 2014.[Abstract]

The objective of this paper is to propose a hybrid energy system using multiple input DC-DC converter (MIC) and Z-source inverter (ZSI) with maximum boost control strategy, which will reduce the system cost as well as the size of the entire converter system. The proposed system interfaces multiple input DC-DC converter and Z-source inverter together to obtain the required AC voltage. The output of MIC is given to a ZSI, which has the capability of single stage conversion to obtain a voltage level needed to feed an AC load. In the proposed system topology 120W three phase load requirement is satisfied by a PV panel of 120 W and a conventional DC source. In this paper a maximum boost control strategy has been used to control the devices on each inverter legs, which will increase the maximum voltage gain and reduces the current ripple and voltage stress.

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Publication Type: Conference Proceedings
Year of Conference Publication Type Title
2013 Conference Proceedings K. K. Murali and A.N. Ravishankar, “Feasibility Analysis of Implementing DC Distribution for Industrial Areas”, National Conference on Technological Advancements in Power & Energy – TAP Energy . pp. 49-54, 2013.[Abstract]

The presence of power electronic equipment in the utility and customer side results in the extensive use of DC power in the system. A DC power system helps to reduce the unnecessary conversion stages thus helps in the reduction of losses in the system. This also helps to reduce in the transmission and distribution losses and also reduces the bulk use of conductors. So DC power system will become one of main power system network in the future. This paper analyzes a distribution system having industrial and residential loads that run in DC system. The power management algorithm helps in effective management of power between the consumers. The objective of the power management strategy is to achieve optimal operational performance providing high power quality, reliability and efficient energy dispatch. This helps in the effective allocation of power to the customers according to the priority, thus helping the stability of the system. For this, a distribution system consisting of industrial loads with and without captive/in-house generation facility along with residential consumers is considered. Simulation studies were carried out using MATLAB/Simulink platform. The proposed DC distribution system validated with a case study of implementing the same in an industrial area called KINFRA Industrial park at Thiruvananthapuram, Kerala, India.

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