Integration of wind and solar pv in hybrid isolated systems with improved power control

Abstract

newlineIn the present era, where Industrialization has become a key factor for economic newlinegrowth, its impacts on environment have been highly adverse.Other than that population newlineoutburst has also been a decisive factor for determination of environmental conditions. Under newlinethese conditions power generation from the conventional sources put further stress on the newlineenvironment. Looking on to the facts most of the focus is given to power generation from newlinerenewable sources, thereby reducing environmental pollution and increasing power newlinegeneration to fulfil the consumer demands. newlineBut power generation from renewable sources is a great challenge in itself. Due to the newlinerandom geographic distribution of renewable energy sources it is difficult to feed the newlinegenerated power to the grid. Again due to the random behaviour of the renewable energy newlinesources, providing uninterrupted and good quality power is also quite difficult. newlineThis work focuses on power generation and control in small autonomous hybrid newlinesystems, applicable for remote rural locations where power grids are absent. Performance and newlinepower quality in hybrid autonomous systems basically depend upon three major aspects. First newlineis formation of hybrid systems by integrating different non conventional sources. Second are newlinethe power electronic converters and their control structures and third are the controllers used newlinefor power control purpose. newlineIn this work different hybrid systems are formed by integrating different non newlineconventional sources, such as micro hybrid system which houses a self excited induction newlinegenerator (SEIG), Wind system which consists of a doubly fed induction generator and photo newlinevoltaic (PV)System. Integration of different systems has been done through different newlineconverters. In this work back to back converts are used to interface the wind system with the newlinemicro hydro system where as a combination of a boost converter and an inverter is used to newlineintegrate the PV system with the micro hydro unit. Three different isolated hybrid systems newlinesuch as SEIG- PV, SEIG wind and SEIG-PV-wind systems are developed and their newlineperformance and robustness are analyzed in this work. newlineThe performance and suitability of different controllers for power control purpose in newlineautonomous system are also studied in this work. Three different controllers i.e. PI controller, newlineFuzzy Logic controller and sliding mode controller are taken into consideration. The stability, newlinevi newlinerobustness and accuracy of the three controllers are evaluated and analyzed and the stability newlineof the controller for power control in hybrid autonomous system is evaluated. newlineWork has also been done to prove the suitability of a new genre of converters, newlineNamely the Nine switch converter in the hybrid autonomous system. The back to back newlineconverters in the above mentioned hybrid systems are being replaced by the nine switch newlineconverters and the accuracy, robustness, stability and power quality of the system are newlineanalyzed and compared in this work. newlineFinally an experimental setup of an autonomous single phase induction generator newlinesystem is developed suitable for rural lighting purpose. An electronic load controller is newlinedesigned and fabricated to control the voltage and frequency of the isolated system. The newlineelectronic load controller is developed with a conventional PI controller at its heart and the newlinestability and the power quality of the system is evaluated by subjecting the system to different newlineload disturbances.