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Design of Fractional Order PID controller (FOPID) for speed regulation of DC motor is presented in this paper. In comparison with conventional PID, FOPID is more flexible and trustworthy to control higher order systems. The FOPID exhibits the Iso-damping property to enhance the robustness of closed loop response of the system against gain variations. According to parameters adjustment problems of...
This paper presents a new and a simple approach to realize a two port network, having transfer function to approximate a fractional order differintegrals (s±α, where, −1< α < 1). In this paper, cascade network connection of the finite number of basic two port network each consisting of an operational amplifier, a capacitor and a resistor is implemented. This is to realize the poles-zeros...
Injection of the wind power into an electric grid affects the power quality. The performance of the wind turbine and their power quality are determined on the basis of measurements, and according to the guideline specified in International Electro-technical Commission, IEC 61400-21.The influence of the wind turbine in the grid system concerning the power quality measurements are-the active power,...
This paper deals with the stability analysis of symmetrical induction motor. The symmetrical induction machine may become unstable over a range of frequencies even though the machine operates from a balanced, sinusoidal, zero impedance source. Small displacement equations valid for small excursions about an operating point are established from the machine equations expressed in synchronously rotating...
Thyristor based, phase angle controlled, speed regulators are widely used for energy efficient control of single-phase induction motors. This leads to power saving but adversely affects the life of insulation in the motors due to non-sinusoidal voltage and current waveforms. The accelerated insulation ageing is due to increased voltage peaks, voltage transients, sharp dV/dt and increased thermal stress...
This paper describes a novel controller for a high temperature superconducting magnetic energy storage (HTS-SMES) that can ensure (a) fast return of energy to the superconducting coil under constant current mode and (b) a constant and sinusoidal input supply current irrespective of the varying load demand with and without harmonics. A special feature of this controller is its ability to smoothly charge...
Thyristor based, phase angle controlled, speed regulators are widely used for energy efficient control of single-phase induction motors. This leads to power saving but adversely affects the life of insulation in the motors due to distortions in the applied voltage and current waveforms. The accelerated insulation ageing is due to increased voltage peaks, voltage transients and increased thermal stress...
Small displacement equations valid for small excursions about an operating point are established from the machine equations expressed in synchronously rotating reference frame. The conventional form of d-q model used for drive simulation has limitations in predicting the machine performance. It is possible that, accurate results for fundamental component of current and average torque near rated operating...
This paper presents a new control strategy for three-phase induction motor which includes independent speed & torque control loops and the current regulation thereby overcoming the limitation (i.e. sluggish response) of volts per hertz controlled industrial drives. For close-loop control, the feedback signals including the rotor speed, flux and torque are not measured directly but are estimated...
The voltage flicker, a phenomenon of annoying light intensity fluctuation, caused by rapid change in industrial and domestic load such as electric arc furnaces (EAF), rolling mills, welding equipments and pumps operating periodically has been a major concern for supply utilities, electricity regulatory agencies and costumers. The FACTS devices like SVCpsilas, STATCOM and Custom Power devices like...
The wind energy generation, utilization and its grid penetration in electrical grid is increasing world wide. The wind generated power is always fluctuating due to its time varying nature and causing stability problem. This weak interconnection of wind generating source in the electrical network affect the power quality and reliability. The localized energy storages shall compensate the fluctuating...
Voltage flicker, a phenomenon of annoying light intensity fluctuation, caused by rapid change in industrial and domestic load such as electric arc furnaces (EAF), rolling mills, welding equipments and pumps operating periodically has been a major concern for supply utilities, electricity regulatory agencies and costumers. SVC's and STATCOM have been able to solve the voltage flicker problems by rapidly...
Awareness of power quality is highly increased in a sensitive industry, where the standardization and performance is an important aspect. The connection of wind turbine to the grid affectpsilas the electric grid power supply quality. Therefore it is necessary to maintain the power quality norm at the interface of the grid from the disruptive effect caused by wind turbine such as voltage fluctuation,...
In this paper, a method for design and implementation of direct torque control (DTC) strategy of induction motor based on hardware-in-loop simulation (HIL) is proposed. The hardware in loop simulation offers the rapid prototyping by reducing time in development and cost. The DTC controller for induction motor is designed and simulation is carried out to test the performance in Simulink/MATLAB. A simple...
In the grid new renewable resources are added to extract more power. This adds more of problems to grid connection. They are voltage fluctuations and harmonic distortion. In this paper various interfacing topologies are analyzed to get wind turbine power within the norms specified in IEC 61400-21. In this paper, a simplified control strategy is used. The front-end voltage source inverter is operated...
This paper develops a systematic and mathematical study of the balancing theory of a three level DC-DC converter. It is proposed to make DC link voltages balanced across the capacitor stack. This voltage distribution gets equally distributed by selecting the appropriate switching frequency. This work is to investigate the new control scheme to incorporate the current adaptive switching in DC-DC converters...
This paper describes sinusoidal pulse width modulation of the voltage impressed to the stator of an induction motor for direct control of torque and stator flux. Instantaneous voltage vectors applied by an inverter have redundancy characteristics which provide some flexibility for selecting the inverter switching modes. By using this switching freedom, control is achieved according to the following...
In speed sensorless induction motor drive, motor model with detailed information assumes paramount importance. The use of reduced order model reduces the computation time which is more desirable when on-line estimation of machine parameters is required. The reduced order models give sufficiently accurate results in some cases, but they cannot be used in general with all the machine ratings. Performance...
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