Event under the auspices of the Ministry of Economy of Slovak Republic

POWER QUALITY IN INDUSTRIAL ISOLATED GENERATION POWER SYSTEMS WITH POWERFUL NONLINEAR CONSUMERS

*Ivan Artyukhov
Yuri Gagarin State Technical University of Saratov

Irina Bochkareva
Yuri Gagarin State Technical University of Saratov

Svetlana Molot
Yuri Gagarin State Technical University of Saratov

Svetlana Kalganova
Yuri Gagarin State Technical University of Saratov

Sergey Stepanov
Yuri Gagarin State Technical University of Saratov

Sergey Trigorly
Yuri Gagarin State Technical University of Saratov


     Last modified: 2017-06-16

Abstract
Massive retrofitting of all sorts of industrial units with power electronics currently progresses. However, nonlinear pulsing characteristics of electronic switches result in power quality deterioration in the supply mains.
Retrofitting often occurs without ensuring electromagnetic compatibility (EMC). Therefore, mutual interference of the existing equipment and the commissioned retrofits is suppressed post factum. The situation might be aggravated by resonant phenomena between a power system with certain parameters and a nonlinear consumer leading to the voltage wave-form distortion and following operation failure of an industrial unit.
The problem of EMC ensuring becomes crucial when a facility or a separate technological unit is powered by an isolated generation power plant with the wattage capacity commensurable with the load. A typical example is the use of variable-frequency driven air cooling units in the oil and gas industries. Field experience revealed necessity of EMC ensuring for these units and the power supply. The reason for this is that a variable-frequency drive conserves electricity concomitantly with degrading the power quality. Simultaneous operation of a certain number of variable-frequency driven air cooling units leads to a significant voltage wave-form distortion in the supply mains.
Similar problems occur in the industrial power systems, consisting of such powerful nonlinear loads as arc furnaces, welding units, electric heaters with thyristor power regulation. Alongside with these consumers, auxiliary variable-frequency drives for transportation and ventilation may be powered from the same system as well.
Deviation of the power quality indices from their standard values leads to energy waste increasing in the power system elements, drop in performance coefficient, output rate and overall energy efficiency of the industrial units.
The power quality indices analysis for an industrial power system with a variable-frequency driven air cooler powered from a gas-turbine power plant was performed with a simulation model built in the MATLAB+Simulink environment
Power feeders of the actual industrial units such as set temperature electric furnaces and variable-frequency drives were examined for conformity of the power quality indices and the current standard corresponding values.
Engineering solutions on maintaining power quality in industrial isolated generation power systems with powerful nonlinear consumers were recommended.

 

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