Power India found that Chennai based Valagam Rajagopal Raghunathan has applied to the Controller General of Patents, Designs & Trade Marks for his invention regarding reactive power management for wind turbine applications.
The application was filed to Controller General of Patents, Designs & Trade Marks on June 21, 2010 with the application number 1716/CHE/2010. The international classification number is F03D.
This invention relates to electrical power generation and in particular to reactive power management in an asynchronous generator wind turbine without the usage of capacitor banks for the power factor and excitation maintenance.
Further, the invention concerns with a system for generating the required reactive power from a separate built in power source to maintain self excitation and to sustain the operation without usage of any physical capacitor banks switching with the generator lines within the predefined operation conditions (changes in wind speed, load).
The system generates the required reactive power from a separate built in power source to maintain the power factor to the optimum level for higher efficiency without any separate capacitor banks switching in the generator power line.
A control system which monitors whose input signals are generator's rotor speed, load, excitation voltage and provide necessary relative power to the SEIG is taken from a DC source through controlled IGBT drivers.
The pulse width modulation (PWM) of the IGBT is controlled by varying the modulation index by the control system, and the feed back for the reactive power required based on the charge accumulated on the DC side of the IGBT inverter.
The proposed design system monitors the wind speed, local load requirement, grid availability and accordingly manages the power distribution for optimum usage of the power produced by the wind turbine,
This system is used to work as a standalone wind turbine without grid power to provide electrical power for devices like pump, heaters, etc or with the grid power connected where the generated power is exported fully/partially after usage of the local loads like pump, heater, etc. or with grid power connected, when there is no sufficient wind energy is available to supply power from grid to the local loads like pump, heater, etc.
More Literature on this topic:
- http://www.power-eng.com/news/2012/05/02/indian-applicant-files-patent-application-for-reactive-power-management-for-wind-turbine-application.html
- http://ipindia.nic.in/ipirs1/patentsearch.htm
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