The Photovoltaic power generation has been found to be most promising in distributed generation among the various non-conventional energy sources. Photovoltaic cell produces de power which is ...suitable for dc loads, to use this power for ac loads an inverter becomes necessity for photovoltaic cells. In case of conventional inverter a filter becomes necessary component; consequently increases the installation cost and adds complexity to the system. A cascaded H-bridge multi level inverter (MLI) has been found as a better alternative. This paper presents a photovoltaic system to drive three-phase induction motor using cascaded H-bridge MLI. For balancing the dc-bus (link) capacitor voltage individual maximum power point tracker (MPPT) control method has been adopted. The whole system is validated by analyzing the performance of three-phase induction motor.
Harmonics is an eminent power quality issue confronted by the end user. It possesses several adverse effects in the electrical environment. It should be reduced for the smooth and efficient ...operation. In the presented study, Distribution Static Compensator (D-STATCOM) is initiated to strengthen power quality in terms of reducing harmonics. The control strategy is contingent on instantaneous power theory. The harmonics annihilation is accomplished by providing compensating current accordingly that it produces the sinusoidal wave shape source current no matter what nonlinear load in the distribution line. The harmonic current of source current is curtailed. The switching of nonlinear load yielded in 30.30 % THD (Total Harmonic Distortion) in source current. The DSTATCOM with instantaneous power theory has improved THD of source current by reducing to 2.31%. The efficacy of D-STATCOM relies too much on the control strategy that is employed to produce the compensating reference current. Besides the numerous control strategy, the instantaneous power theory proves its functionality very well. The amount of compensating current by voltage source inverter (VSI) to make the source current sinusoidal depends on the switching pattern of IGBT of VSI.
Problem of frequency regulation in an AC system is a major challenge in modern power system. Recently due to considerable growth of renewable energy sources and distributed generations, the concept ...of microgrid is gradually more being used. But, renewable energy sources (RESs), forming a MG, are by nature having unpredictable variations of their power output. The system disturbances occurs either from generation side or from load side causes uncertainties in power output which make it difficult for the conventional controllers to provide good dynamic performance over an extensive variety of working environment. This paper addresses the microgrid system with respect to load disturbances and proposes a fuzzy gain schedule proportional-integral-derivative (FGSPID) controller and for relative investigation, the traditional PID controller is additionally executed on the same microgrid framework. Simulation response validates that the frequency response of the microgrid system has enhanced significantly with the application of FGSPID controller as compared to conventional controller.
