University of South Wales Master of Sciences Thesis
Standalone hybrid generation system for the remote area of Thar, Pakistan
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Standalone hybrid generation system for the remote area of Thar, Pakistan turbine driven by the asynchronous (induction) generator. The wind turbine block uses a 2- dimensional lookup table to compute the turbine torque output as a function of wind speed and turbine speed. At low wind speeds both the induction generator and the diesel-driven synchronous generator are required to feed the load. When the wind power exceeds the load demand, it is possible to shut down the diesel-generator. In this all-wind mode, the synchronous machine is used as a synchronous condenser and its excitation system controls the grid voltage at its nominal value. A secondary load bank is used to regulate the system frequency by absorbing the wind power exceeding consumer demand. In comparison to the system the system proposed in this report will be more reliable and economical to provide electricity to the remote area of THAR as it includes wind and solar generation sources that will meet must of the load depends it self and in case due to unavailability of the renewable sources due to climate change, diesel generator can be used to meet the demands and also during peak resources availability power can be stored to the storage banks hence use of Genset will be limited making it more economical and environment friendly system and also in the published design the system is using DC coupled HPS which is more complicated and requires more inverters hence make it more costly and less efficient while in system, proposed in this report will be using mixed coupling system to make it more efficient and economical, Below is the block diagram of the published system design(wind–diesel system originally developed by the Hydro-Quebec). Figure 2.1 DC coupled Hybrid generation system [4] Figure 2.2 Mixed coupled Hybrid generation system [5] In the literature, most of the models using wind turbines are based on a non-linear relationship between rotor power coefficient and linear tip speed of the rotor blade [6, 7] Muljadi and Butterfield mention the advantages of employing a variable speed wind turbine and present a model of it with pitch control. In his model, during low to medium wind speeds, the generator and the power converter control the wind turbine to maximize the energy capture by maintaining the rotor speed at a |