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Electric AC arc furnaces used in steelmaking are nonlinear loads of large power. Due to chaotic nature of the electric arc and the melting process, such devices cause significant power quality problems in a supply network, mainly harmonics, inter-harmonics, unbalance, voltage dips and flickers. Limitation of this negative influence and optimization of the cast process is an important issue. In the...
Phase locked loop (PLL) is an important part of the current-controlled grid-connected converter. Its job is to estimate the phase angle of the grid voltage. If the PLL is not robust, the grid-voltage distortion will lead to an error in the estimated phase leading to a degradable performance of the converter. In this paper, the effect of the PLL on the operation of a current-controlled voltage-source...
In recent years, consumers of power energy pay more and more attentions on power supply quality, they demand high level supply quality. Therefore, the cost of power quality becomes a main issue to utility engineers when they consider power quality problems. For many industry customers, the main components of power quality costs are short interruption, voltage dips and harmonic costs. The data used...
The paper presents a measurement campaign to compare the behavior of voltage transducers suitable for medium voltage (MV) networks in the measurement of power quality (PQ) parameters. In particular, high bandwidth resistive-capacitive dividers are compared to traditional magnetic core instrument transformers. Firstly, the main specifications of the compared transducers are recalled and the experimental...
The quality of the power is impaired by several reasons. This degradation of the quality of the power is seen e.g. as supply interruptions, transient overvoltages, voltage dips, flicker, harmonics and voltage unbalance. The quality of the power may be improved by using power conditioning equipment, which may be either passive or active. This paper discusses one of the most modern power conditioning...
This paper gives an overview of the ongoing activities in CIGRE WG36-07: "Power quality indices and objectives". It introduces the considerations supporting the need for power quality indices and objectives in the present context of deregulation of the electricity industry. Experts generally agree on the need for standardized quality indices allowing to monitor and to report power quality...
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