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This paper is focused on active power consumption and losses in industrial and commercial facilities, depending upon supply voltage quality parameters. The shunt capacitors for power factor correction affect directly supply voltage level and harmonic distortions of supply voltage and current and hence affect power losses in industrial facilities, particularly in induction motors. In the paper practical...
Using a flywheel and a squirrel-cage induction motor, this paper proposes two inverter-less applications for electrical power quality improvement by compromising a little frequency fluctuations; (1) a voltage sag compensator using a capacitor self-excited induction generator without semiconductor power converters, (2) blackout delay system for industrial robots safety shutdown. In the first section,...
Mainly due to historical and convenience reasons, for power levels up to several kVA electric utilities provide power distribution typically uses 1-phase a.c. feeders, despite a 3-phase supply would be technically preferable permitting for instance to use more efficient and compact induction motors, 3-phase rectifiers providing lower output ripple etc. This paper deals with a simple converter able...
Traditionally voltage source inverter (VSI) and current source inverter (CSI) fed induction motor drives have a limited output voltage range. Conventional VSI and CSI support only current buck DC-AC power conversion and need a relatively complex modulator. The limitations of VSI and CSI are overcome by Z-source inverter. The Z-source inverter system employs a unique LC network in the DC link and a...
The paper presents a novel device for energy conservation, power quality enhancement using switched power filter and compensator device for three phase motorized electric loads. The modulated power filter and compensator (MPFC) was developed by the first author to vary the shunt power filter equivalent admittance, modify the reactive power flow to the motorized electric load, improve electrical utilization...
Typically, electric energy is available from mains via a.c. feeders, which are usually 1-phase for power levels below several kVA due to convenience reasons. Anyway, the availability of a 3-phase supply might benefit also such class of loads, e.g. permitting to directly supply better quality induction motors. This paper proposes a converter able to generate an almost symmetrical 3-phase supply from...
The self-excitation phenomenon was investigated by the presence of capacitors connected in the proximities of induction motors, when voltage sags and short interruptions take place. The investigation was carried out in analytic form using Matlab and experimentally in the laboratory of the IPSEP. This phenomenon has been reported as the origin of numerous damages inside industrial facilities. From...
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