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In photovoltaic (PV) applications, power electronic converters play a vital role in transferring power from source to load. In general, operating voltages of PV arrays are low. To interface them with high voltage DC bus, a high voltage conversion system is needed which is provided by high gain topologies. Moreover, to increase the power density, efficiency of conversion and decrease cost, recent developments...
Operating point of a given wind energy conversion system (WECS) changes due to variations in wind velocity and applied load. As a consequence, mode of operation of the dc-dc converter, which implements maximum power point tracking (MPPT) control algorithm, shuttles between continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Moreover, conventional design process of a converter...
The Dynamic Voltage Restorer (DVR) is a custom power device connected in series with the load, which can control the voltage applied to the load by injecting a voltage of arbitrary amplitude, phase and harmonic component into the line. The conventional hysteresis voltage controller of DVR is simple to implement and has a fast dynamic response etc. However, it suffers from the demerit of variable switching...
In this paper, a new methodology is proposed to mitigate unbalanced voltage sag with phase jumps by Unified Power Quality Conditioner (UPQC) with minimum real power injection. Particle Swarm Optimization (PSO) has been used to find the solution of the objective function derived for minimizing real power injection of UPQC along with the specified constraints. The proposed method is validated through...
This paper proposes a fixed frequency modulation scheme for a three-phase PWM rectifier operating at unity power factor. It provides a constant and reduced switching frequency for all the switches of the rectifier by controlling the occurrence and duration of the zero vector states indirectly. The two legs of the converter are operated in hysteresis current tracking mode and the third leg is controlled...
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