Abstract
The coal grading plants in Vietnam extensively apply asynchronous motors with frequency control. They consume reactive power and non-sinusoidal current from the supply network. The nonsinusoidal currents and voltages lead to additional energy losses in electrical equipments, reduce their service life and cause an economic damage. Because of the low load power factor the companies with such plants pay penalties to power supply utilities. These problems can be solved by the active filters. The paper suggests an optimization algorithm to calculate the power of the active filter, which provides a load power factor corresponding to the normative documents and power quality indices corresponding to the standard requirements. The algorithm is used to calculate the power of the active filter for the coal grading plant owned by the company “Kua Ong-Vinakomin”.
Highlights
Coal mining is one of the most important economic industries of Vietnam
An active filter is suggested in [3,4,5,6,7] to solve the problems of the load power factor, harmonics and interharmonics
The problems caused by harmonics, interharmonics and cosφ can be resolved using the active filter that is connected to the network in parallel to the nonlinear load
Summary
Coal mining is one of the most important economic industries of Vietnam. Mines and quarries have coal grading plants. The manufacturing equipment of the plants is driven by asynchronous motors, primarily with frequency control. They are nonlinear loads for power supply systems and distort power quality. The harmonic factors of voltage exceed the established standards [1]. Voltages and currents contain both harmonics and interharmonics. The load power factors are lower than the value agreed by the normative documents [2]. An active filter is suggested in [3,4,5,6,7] to solve the problems of the load power factor, harmonics and interharmonics. The paper presents an analysis of the power supply system of the coal grading plant, results of the tests of electric power, formulates an optimization problem and describes an algorithm to determine the power of the active filter, presents results of calculation of the power of active filter for the coal grading plant of the company “Kua Ong-Vinakomin”
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