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DC microgrid is becoming popular due to high efficiency, reliability and easy integration of renewable sources. Droop controller based distributed technique is used in dc microgrid for proportional power sharing among sources. However, due to interconnecting cable impedance, trade-off exists between power sharing accuracy and voltage regulation. Centralized controller achieves these objectives using...
In this paper, a forced commutation technique for a thyristor-based current source inverter (CSI) used in load commutated inverter (LCI) drive is presented. This auxiliary commutation circuit is required only during the starting of the Synchronous machine. The commutation circuit employs four thyristors and a capacitor. A pair of thyristors in the auxiliary circuit is triggered, whenever a pair of...
The control and management of AC and DC microgrids is a major area of research addressing some of the key challenges like the integration of renewable energy sources (RES), source optimization, and stability issues etc. Numerous microgrid control strategies have been proposed and examined earlier. However, the control becomes even more susceptible to instability due to the participation of intermittent...
This paper presents a control strategy of modular multilevel converter which produces single phase AC output from a three phase AC source. With the proposed strategy, the magnitude and frequency of the output AC voltage of the converter can be controlled while the input 3 phase voltage is maintained at a fixed magnitude and frequency. Thus, the converter acts as a direct AC-AC converter without any...
Brushless direct current motor finds its applications in electric propulsion due to its reliability, reduced electromagnetic interference and improved life cycle cost. Rotor position sensing with sensorless techniques exhibit better performance with varying temperature and humidity conditions as well as continual motion of the vessels and also overthrow the use of hall sensors. A control technique...
Dynamic performance of a brushless DC motor is greatly influenced by a controller and the controller design relies on average-value models, which are vital in small signal and large signal analysis of electromechanical systems. Average-value model (AVM) of a brushless DC motor can be constructed by averaging motor variables or by exploring its resemblance to a DC motor. AVM can also be constructed...
Present electromagnetic contactless energy transfer systems (CET) powering vibrational actuators in vibration assisted rotary machining are designed for drive systems operating at one frequency. Such systems are composed of a resonant actuator, a CET system and compensation circuits and are matched to the resonance frequency to optimize power efficiency and reduce size. In this work a design concept...
In this paper a simple and robust parameter estimation methodology for single phase transformer and three phase induction motor is proposed using particle swarm optimization (PSO) technique. Here the equivalent circuit parameters and losses of a single phase transformer and a three phase induction motor are obtained using PSO technique. The obtained results from PSO are verified by comparing it with...
This paper presents proportional integral direct torque control (PIDTC) and fuzzy-2 DTC (F2DTC) of the induction motor (IM) drive using space vector modulation (SVM) for five-level diode clamped inverter (FDCI). The above control schemes have been implemented in the laboratory using 2HP IM through a DSPACE DS-1104 controller. The dc-link capacitor voltages of FDCI are balanced in both the control...
In a power system, transmission line are exposed to the wrath of the nature, which makes it susceptible to the occurrence of faults. Such faults have to be cleared at the earliest to deliver utmost continuity of supply to the consumers. In this respect, the primary aim is to produce a methodology which supports numeric relays in precisely detecting, classifying and locating the fault in transmission...
In conventional power systems, load frequency control (LFC) or automatic generation control (AGC) is done using PI controllers implemented in steam turbine generator systems. In the PI controller, the proportional part represents droop of the governor and integral part restores frequency to nominal value by changing load reference set point of the turbine valve. In an isolated micro-grid electronically...
Emerging applications such as solar cells, fuel cells, energy storage, UPS, etc. require voltage gain and are low voltage high current specifications. This paper thoroughly studies and reviews high-frequency current-fed converters for low voltage high current applications. Hard-switching, dissipative or passive snubber based, active-clamped, naturally-clamped, impulse commutated, and parasitic assisted...
Rotational core loss data is required for core loss estimation in electrical machines. This necessitates the design of 2D magnetizers to accurately measure these losses. However, the accuracy of any 2D magnetizer is contingent on its ability to maintain a uniform field distribution in the sample, at least in the measurement area, for all flux density levels and magnetization directions. Moreover,...
In this paper, a variable step size filtered X-least mean fourth (FX-LMF) algorithm is proposed for a single-stage three-phase grid tied solar energy conversion system with active shunt filter capabilities. It consists of a SPV (Solar Photovoltaic) array, a voltage source converter, a three-phase grid and connected linear and nonlinear loads. The proposed algorithm helps in faster convergence and...
This paper proposes a new hybrid asymmetric multilevel inverter for generating the higher number of levels with reduced number of power semiconductor switches. The hybrid asymmetric multilevel inverter consists of full bridge inverter and reduced switch inverter topology. The reduced switch inverter topology can generate 13-level output voltage without utilizing full bridge inverter. When the full...
This paper proposes a grid interactive bidirectional solar water pumping system using a three phase induction motor drive (IMD). A single phase voltage source converter (VSC) is used to direct the flow of power from grid supply to the pump and back to the grid from SPV array. A boost converter is used for the maximum power point tracking (MPPT) of the SPV array. A smart power sharing control is proposed,...
In this paper, we show that by suitably integrating simulated annealing (SA) with perturb and observe (P&O) algorithm, the performance of maximum power point tracking (MPPT) in a photovoltaic (PV) system under non uniform insolation conditions can be substantially improved. The appealing advantages of SA and P&O method are thus combined to yield a robust MPPT which always guarantees global...
This paper presents the performance analysis of a single phase UPQC (unified power quality conditioner) device with a left shunt APF (active power filter) configuration, termed as left shunt UPQC. This device is applied for a special load configuration. One set of load is voltage sensitive with considerable reactive power demand. The other set consist of load which is quite unaffected by voltage disturbances...
A Dynamic Voltage Restorer (DVR) model is designed for the mitigation of voltage sag and is tested for distribution system to improve Power Quality (PQ). The design is carried out with the aid of Voltage Source Inverter (VSI) in the application of DVR. The experimental results obtained are presented in this paper to analyze the performance of VSI with Sinusoidal Pulse Width Modulation (SPWM) control...
Operation of a three-phase induction machine on single-phase supply has been an approach used for electromechanical energy conversion in rural communities with limited or no access to three-phase grid. Such single-phase to three-phase conversion can be achieved by passive and active means. In passive methods, fixed capacitors are used for starting and running the motor. Single-phase to three-phase...
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