SIMULATION OF HYBRID MICRO-GRID WITH PV, WIND AND MICRO-HYDRO USING D-ELC IN AN ISOLATED SYSTEM
Keywords:
system, power, supplyAbstract
Background: Isolated Hybrid Micro-Grid system is an interconnected system where numerous types of power plants like Micro-hydro, PV, Wind, Diesel etc. are connected with each other. In doing so, one isolated grid apart from national grid will be formed which helps to supply continuous power to certain locality where national grid is arduous to extend. For instance, if the power plant supplying power to an area ‘X’ gets failed due to several faults and if it acts as a part in establishment of isolated grid, in that scenario power in area ‘X’ will be supplied by other power plants which is the most important benefits in forming micro-grid. Methods: As a college representative I took part with team of Alternative Energy Promotion Centre (AEPC) and Aspin Kemp & Associates (AKA)-one Canadian Company, to study micro hydro namely “Yafre Khola” and “Shobuwa Khola” in order to develop micro-grid in Taplejung. After scrutiny of different ways of generation of power from various renewable energy resources, individual simulation model of each system namely PV, WIND and MICRO-HYDRO was developed and finally they were interconnected with each other to form an isolated micro-grid. Results: By tackling various obstacles, finally power in the overall simulation model of micro-grid system gets balanced i.e. the sum of power generated by various generating units equals the power consumed by the load and D-ELC (Discrete Electronic Load Controller). Rotor speed of various generating plants meets its frequency stability criteria. The output voltage waveform of the formed isolated grid was purely sinusoidal without any harmonics. The power output from wind and PV were varied using different input signal and in doing so too there exist power balance in the system. In order to note what will be the output waveform of rotor speed when certain amount of load is removed instantly at certain period of time, we detached certain load at 5 sec and it was noted that after certain time of fluctuation, rotor speed of various plants fulfilled its frequency stability criteria. To decrease the presence of harmonics Central D-ELC is used instead of ELC. Individual ELC of individual power plants were replaced by a single central D-ELC which lowers the cost of requirement of individual ELC. Finally we were able to develop control strategy for the Micro-grid having various types of generating units to give stable operation. Conclusion: The parallel operation of two MHP plants with ACVC type ELC gives stable operation with proportional load sharing by ELCs. The parallel operation of two MHP plants –one with ACVC type ELC and other with D-ELC gives unstable operation. A Common D-ELC can give stable operation of Micro-grid with various types of Generators. In addition, on employing wind power plant, Photovoltaic along with Micro-hydro results in stable operation when central D-ELC is used.
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