Control circuit of an Electronically Controlled Capacitor for the Optimization of the Single Phase Induction Motor
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2015, Vol 39, Issue 39
Abstract
The control circuit of an Electronically Controlled Capacitor (ECC) for the optimization of the Single Phase Induction Motor (SPIM) with auxiliary winding is presented. The control circuit is based on a fixed value AC capacitor within a full bidirectional switches bridge PWM controlled at much higher than line frequency (in kHz range). The power bridge circuit and its embedded pulse driver circuit are presented within the theoretical sections of the paper. In the experimental section, using a small electric motors test bench and a two speed SPIM with auxiliary winding, are analyzed the main influences of the pulse drive circuit over the ECC. Firstly, being considered that the optimum is reached at the maximum motor torque, the optimal pulses frequency has been established around 4 kHz. Secondly, the switches over-voltages at the ommutations moments being a serious drawback of the ECC, are analyzed the influence of the fixed capacitor value and the dead time of the pulse shape over the MOS-FET power transistors of the bidirectional switches over-voltages. The overvoltages diminish as both the capacitor value and the dead time diminish. More than that, in contrast with some authors, there are no disadvantages as dead time became zero. These issues are the main contributions of this paper.
Authors and Affiliations
Radu Campeanu, Adrian Danila
A "SMARTGRIDS-ASSISTANT" FOR POWER GRID OPERATION AND TRAINING
SmartGrids are understood as cell-wise structured, intelligent supply areas with own, distributed and renewable generators and storages. The actual intelligence is the IT-supported structure and control, especially to ma...
UNIFIED COMMUNICATION PROTOCOLS INTERFACE OVER INMARSAT NETWORK AND INTERNET
This paper describes the modality to unify two communication ways through INMARSAT in one communication layer. The authors’ intention is to create one communication layer which can be connected with INMARSAT data network...
Finite Volume Method for Electrostatic Problems
In this paper, we examine the problem of determinining the electrostatic potential distribution and field intensity vector in the high voltage divider and around the power line support. The potential is defined as the so...
TIME-DOMAIN BASED ACTIVE COMPENSATION STRATEGIES UNDER NONSINUSOIDAL CONDITIONS IN THREE-PHASE THREE-WIRE SYSTEMS
This paper deals with the peculiarities involved by the operation under nonsinusoidal voltage conditions on the generation of the reference compensating current in three-phase three-wire shunt active power filters. The t...
Effect Assessment of TCSC on Algerian Transmission Line Protected by IDMT Directional Overcurrent Relay
The paper presents the effect of apparent reactance and injected voltage by series Flexible AC Transmission System (FACTS) i.e. Thyristor Controlled Series Capacitor (TCSC) on transmission line high voltage protected...