Abstract
Modern adjustable electric drives are based on frequency converters with asynchronous or synchronous motors. Frequency converters with active front end as part of high-power electric drives with frequent dynamic modes have been widely implemented in production. However, when using them, as a rule, due attention is not paid to the issue of electromagnetic compatibility of such converters with the power supply network. High-frequency harmonics generated by active front end, in the case of superimposition on the resonant region of the frequency characteristic of the distribution network, lead to significant voltage drops at the same frequencies. As a result, there is a deterioration in the power quality in the intra-plant 6-35 kV network and problems with the functioning of sensitive electrical receivers arise. A number of investigations have been carried out aimed at ensuring the electromagnetic compatibility of frequency converters with active front end. The following technical solutions have been developed and considered: 1) selection of the optimal algorithm of pulse-width modulation of the active front end and its parameters, 2) application of special filter-compensating devices, 3) application of improved control systems of the active front end or improved algorithms of pulse-width modulation, 4) change of the configuration of the power supply system. This article provides an analysis of their effectiveness based on the data obtained under the conditions of existing production facilities. Conclusions are made on the expediency of using certain technical solutions depending on the openness of the active front end control system, the parameters of the network frequency response, the operating modes of the electric drive and the configuration of the power supply system.
Keywords
frequency converter, active front-end, power supply system, pulse-width modulation, power quality indicators, frequency response, current resonance, control system, filter compensating device, specialized passive filter.
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