Abstract
Hardware and software for measuring and monitoring the unbalance factor of the three-phase voltage system is developed. The shortcomings of the existing technical and software solutions for calculating the unbalance factor, as well as problems of applying the methods used for analog control systems to digital systems are described. The block diagram of the microprocessor system for measuring the voltage unbalance factor in the ship three-phase network with the effective values of phase voltages is used. The analysis of the analytical expressions to calculate the unbalance factor allowed minimizing the utilization of system hardware necessary for the formation of all necessary signals. The optimized structure of the digital filter to calculate the effective value of the deterministic periodic signal at the optimum speed of a discrete system is proposed. An increase in the sampling rate in the optimized filter structure does not lead to an increase in the number of arithmetic operations of addition and multiplication, which is an advantage of the proposed system in comparison with similar ones. This allows monitoring of instantaneous changes in the unbalance factor of three-phase voltage and enables the system to operate in real time. The developed hardware and software can be integrated into the automated control system of the power plant and used in voltage control systems, as well as for the timely detection of voltage unbalance to protect equipment and prevent violation of normal operation.
Highlights
At present, much attention is paid to power quality control in ship power systems (SPS)
The unbalance factor obtained using the developed monitoring system is consistent with the results presented in [1]
Based on the analysis of the analytical expressions for calculating the unbalance factor, in which the effective values of phase voltages are used, utilization of the hardware necessary to obtain the required signals is minimized. This ensured high speed of the developed system, as it is equipped with three null detectors, signals from which are sent to the microprocessor for processing and determining phase shifts
Summary
Much attention is paid to power quality control in ship power systems (SPS). The ship power system is a complex set of power sources and consumers that have various operating modes – from continuous to short-term and intermittent. The problem of power quality in relation to ship power systems is extremely relevant. When assessing the power quality, there are a number of unresolved or insufficiently resolved problems of measuring the unbalance factors. These problems are related to mathematical, algorithmic and software support. The high cost of ship electric equipment, as well as the complexity of repair in navigation conditions, create the prerequisites for developing modern power quality control systems
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