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This paper presents five-level series active power filter based on modified instantaneous reactive power theory control strategies. The standard configuration uses voltage source inverter with hysteresis controller, this configuration presents several drawbacks such us uneven switching frequency. Multilevel inverters are currently being investigated and used in various industrial applications. Five-level...
This paper presents a fuzzy logic based speed control of an asynchronous motor by a 6-switched 3-level inverter. This inverter topology contains a new and alternative model to multi-level inverter topologies. The fuzzy logic controller and the space vector pulse width modulation techniques are used to generate the necessary signals for the inverter. The asynchronous motor is run without load and with...
Recent development in Fuzzy logic control algorithm has led to the advancement of the existing smart grid technologies where it requires powerful control algorithm in an uncertain environment due to high penetration of the Renewable Energy Sources(RES). Due to the adaptive and human-like control decisions taken by Fuzzy Inference System (FIS), this would be much suitable to tolerate the uncertainties...
Conventional PI controller has overshoot effect at the transient period of the speed response curve. Most of the controllers of Induction Motor (IM) for industrial applications have been designed based on PI controller without consideration of core loss (CL) and stray load loss (SLL). In order to obtain the precise performance of torque as well as speed and flux, the mentioned losses should be considered...
In this paper two different conversion systems of wind energy into electricity are investigated. In the first system studied the wind turbine is connected to a three phase diode rectifier. At the output of the non-controlled rectifier a DC/DC boost converter is connected. Controlling the switching pattern for the DC/DC converter the maximum power point tracking (MPPT) is achieved. In the second system...
This paper proposes an intelligent method for maximum power point tracking (MPPT) of a photovoltaic system under variable temperature and insolation conditions and conversion of this solar energy into stabilized sine wave having low distortion factor (DF), so that the solar energy can be supplied to grid and can operate electrical and electronic devices efficiently. For the reduction of tracking time...
In this paper, a fuzzy logic controller has been developed to obtain a stable current output adjusting the modulation index of a multilevel converter in a variable speed wind turbine system. The variable speed wind turbine system has been modeled containing a squirrel-cage induction generator (SCIG), and SPWM controlled AC-DC-AC converter which is constituted of a 6-pulse rectifier and 3-level multilevel...
This research studied on the relative humidity controller by fuzzy logic method. The system consists of the evaporating coils laid inside the duct which has square shape cross section area and the relative humidity at the duct output is considered. The relative humidity set point changing and the air flow rate are parameters of this study. The relative humidity process variable is detected by the...
A sensorless direct torque controlled (DTC) induction motor drive fed by a 3-level inverter is presented based on discrete space vector modulation. A novel vector synthesis sequence is proposed to solve the problems caused by the topology of the 3-level inverter, such as neutral point unbalance and excessive voltage jump, while maintaining the merits of simplicity and robustness. Fuzzy logic control...
The cross connected intermediate level (CCIL) voltage source inverter topology was first introduced in the work of Chaudhuri et. al (2007). The idea behind this novel multilevel topology is to explore the area of reduced number of component topologies producing large number of voltage levels. Mathematical modeling of the electrical circuit for the understanding and the control of the capacitor voltage...
Fuzzy logic (FL) is proposed for controlling the saturated slip power recovery drive (SSPRD). The controlled system response to step changes in the reference speed in load torque, and changes in rotor resistance are presented. A comparison between the responses of the PI controlled and the FL controlled SSPRD to such variations is developed. The same study and comparison is accomplished for the non...
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