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A Pulse Width Modulation (PWM) Voltage Source Inverter (VSI) fed induction motor drive has superior dynamic characteristics than sine wave driven induction motor. But it has a problem with induced bearing voltage and high frequency bearing current that flows through bearings due to parasitic capacitive coupling that results in premature bearing failure. In many industrial applications the PWM inverters...
The main objective of this paper is that the optimization is to perform a best utilization of existing transmission lines. And also an attempt has been made to optimize each objective individually using Particle Swarm Optimization. The so developed algorithm for Optimization of each objective is to be tested on power systems i.e. on IEEE 14 bus system. In this connection, the FACTS devices like STATCOM...
This paper deals with a design of a hysteresis voltage control based inter line dynamic voltage restorer (IDVR) in three phase system under different considerations and the proposed inter line DVR to improve power quality in parallel feeder distribution system with help of multi converts. The IDVR has to inject the required volt ampere power into faulty feeder system in order to regulate the load...
The various power quality issues are of great concern now a days. The quality of power provided to the consumers can be improved by using custom power devices, (CPD). CPD uses power electronic controllers in distribution systems in order to provide reliable and good quality of power needed to power consumers. This paper gives that the use of Dynamic voltage restorer and hybrid active filters improves...
This paper deals with a new design dynamic model of synchronous-reference- frame (SRF)-based control in three phase system under different load considerations to improve power quality by using power conditioner with multi converters. The proposed MCUPQC system can regulate the load voltages/bus voltages on Parallel power distribution systems under balanced and distorted load conditions and obtain...
This paper presents the analysis of potential and electric distribution characteristics of outdoor polymer insulator. Silicone rubber provides an alternative to porcelain and glass regarding to high voltage (HV) insulators and it has been widely used by power utilities since 1980's owing to their superior contaminant performances. Failure of outdoor high voltage (HV) insulator often involves the solid...
This paper implements modelling of MicroGrid by different Distributed Generators (DG). A solution for data acquisition and control of MicroGrid using wireless technique (ZigBee @ 2.4 GHz), that manages the reading of various electrical parameters in different DG's and through-out the system. The first one describes the simulation and the dynamic performance of MicroGrids, while the second model is...
An increasing part of low voltage standard induction motors operates with PWM voltage source inverters using IGBTs and they are applied to a wide range of power 0.1 kW up to some MW. The PWM (pulse width modulation) inverter mode of control generates a large frequency spectrum of overvoltages. The resulting undesired overvoltages at the motor terminals stress the motor insulation. Usual standards...
Advances in power electronics technology have improved the performance and output waveforms of PWM voltage source inverters. Switching frequencies of 2 to 15 kHz with 0.1 mus rise times are common with the current IGBT technology while allowing for power levels over 200 kW. While the high switching speeds and zero switching loss schemes drastically improve the performance of the PWM inverters, the...
Many of today's induction machines are operated using variable speed drives (VSD). VSDs are used for controlling the speed of induction machine by adjusting the amplitude and frequency of the AC voltage. These adjustments are made by advanced technology in semiconductors, which are faster switching devices. Faster switching reduces the switching power loss, requiring less heat sink, thus enabling...
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