Search

In India, the navigational buoy is a standalone system to guide the ship in the navigational channel of the port. Conventional navigational buoy is usually powered by solar energy and the continuous operation of the buoy may be affected during prolonged rainy weather and cloud cover. The indigenously developed wave powered navigational buoy produces electrical power from ocean wave and the same is utilised to electric power up in situ components as marker lamp, oceanographic sensors and its data logger along with a wireless communication system.Based on the results of experimental studies conducted and results obtained during open sea trials, this paper elaborately describes about power take-off system and power assessment of power module which includes sizing of battery, integrated sensor and power circuit, power mangement etc., In this paper elaborated about energy generated during open sea trials in the year 2019 (June-Novemebr). This buoy generated electricity which is self sutatined for power requirement of the buoy.This standalone wave powered navigational buoy is successfully demonstrated for longer periods at all weather conditions in Kamarajar Port limited, chennai. It may be useful product for ports and harbours in India as a stand alonewave power device.

Permanent Magnet Synchronous Generator (PMSG) is a type of electric generator where external excitation source is not required to produce a magnetic field because of which it suits underwater electricity generation using Ocean Current Turbines (OCT). Due to the slow speed nature of the OCT, mechanical transmission systems such as gear box, belt drives usually being used to fit the torque — speed characteristics of OCTS with the high speed PMSGs. This results in high starting torque in addition to the transmission losses. To avoid these issues, low speed PMSGs are required to be designed for the speed-torque characteristics of the OCT. This paper briefs the novel methodology to design the low speed PMSGs for the OCT applications and in-house fabrication of a low speed PMSG using the same methodology.

The ocean current energy is one of the clean forms of available renewable energy sources. Based on the topography of the islands, the subsea current is comparatively more than the mainland. Most of the islands are not having self-sustained power sources due to the limitations of infrastructure even though the power requirement is less. The National Institute of Ocean Technology (NIOT) of Ministry of Earth Sciences has undertaken the research and development of an ocean current power module for such islands. The first prototype ocean current turbine (OCT) power module was tested at Macpherson Strait in the Andaman open sea. The subsea power module of the system comprises of the turbine, transmission system, generator and the associated power and instrumentation systems. The development and implementation of electrical and instrumentation system for an underwater OCT power module are one of the challenging task, hence the entire system required to be designed for in-situ conditions. This paper aims to describe the design of Power take off (PTO) system, data acquisition, and wireless communication of prototype ocean current power module trials in open sea conditions.

A major attraction of a floating wave power plant as opposed to a fixed Oscillating water column (OWC) plant is in the cost of construction. The price paid is in the lower efficiency of conversion in the hydrodynamic stage. This puts onus on the subsequent power module stage in achieving an efficiency that is necessary for a commercial plant. A new backward bent ducted buoy (BBDB) was designed in which the power module is a twin unidirectional turbine. Basic experimentation on the power module is done on a turbine with 165 mm diameter and characterized with bidirectional flow with widely varying flow rates. The efficiency is shown to be better than 68% over the expected working range. The details of a plant producing 50 kW for Indian conditions is described. The range of powers over which a BBDB structure compares with a fixed OWC is highlighted.