Energy saving effect due to the voltage reduction in industrial electrical networks

Abstract

The power consumption is depending on the voltage level at the load bus. For many enterprises, especially for the enterprises making small series of various products the production conditions and, respectively, the power consumption by different consumers can be significantly different from day to day. It is difficult to assess the real effect of optimizing the voltage level over a short-time. The method of the express-estimation of the power reduction effect caused by the reducing of the voltage level is discussed in the paper. A row of LV networks were investigated with the purpose to develop and to verify practical measures for the reduction of power consumption without affecting the production processes in the enterprises. The practical results of the carried out voltage optimization are discussed in the paper.

An Intelligent Control Strategy for Power Factor Compensation on Distorted Low Voltage Power Systems

“…At a given harmonic frequency in any system where a capacitor exists, there will be a crossover point where the inductive and capacitive reactances are equal . Consequently, the total impedance approaches infinity and a very high voltage harmonic may result if the commercial facility harmonic current has a frequency close to (3) where…”

“…The application of power factor (PF) compensation has long been accepted as a necessary step to improve the efficiency of these low voltage electrical installations [1]- [3]. This is usually achieved by installing capacitors downstream to the supply transformer at the entrance point of the facility.…”

“…In cases of resonance, this current may be very large and may damage the capacitors. Therefore, the consideration of PF compensation capacitor installation should also include harmonic resonance analysis at the design stage [1]- [3], [5], [6].…”

Power Factor Compensation on Distorted Low Voltage Power Systems

“…The application of power factor (PF) compensation as a necessary step to improve the efficiency of these low voltage electrical installations [1]- [2]. This is usually attained by installing capacitors at the entrance point of the facility downstream to the supply transformer.…”

“…In case of resonance, this current may be very high and may damage the capacitors. Therefore, the consideration of PF compensation capacitor installation at the design stage [1]- [2] should also include harmonic resonance analysis . Possible solution to avoid harmonics include the following: 1) adding a filter capacitor; 2) adding a reactor to an existing bank; 3) ungrounding grounded-wye capacitors; 4) changing capacitor bank locations and sizes; and 5) In order to avoid resonance, controlling the capacitor switching scheme.…”