Abstract
The problem of ensuring the required electric power quality in the systems of in-plant power supply with powerful electric drives of industrial mechanisms based on frequency converters with active rectifiers (FC-AFE) is not fully resolved. Active rectifiers (AFE) in the FC create high-frequency harmonic components in the network current, which have a negative effect on the harmonic composition of the supply network voltage. In the presence of parallel resonances in the 6-35 kV network, the level of harmonic distortion of voltage THDU during the operation of powerful FC-AFE becomes unacceptable, which leads to disruptions in the operation of various electrical receivers. The development of methods for ensuring electromagnetic compatibility (EMC) of FC-AFE by using new types of filter-compensating devices that take into account the presence of resonance phenomena in the 6-35 kV network is relevant. In this article, using the example of the power supply system of JSC "Balakovo Metallurgical Plant", a method for ensuring EMC of the FC-AV using a specialized passive filter (SPF) is developed. The SPF is a new type of single-frequency harmonic filter, which differs from the known ones in its high quality factor Q ≥ 1000 p.u., the use of capacitors capable of operating with a current curve sinusoidality distortion coefficient THDI of up to 45%, as well as a technique for selecting power, capacitance and inductance, taking into account the presence of current resonance in the supply network and THDI of the FC-AFE. The technique for selecting the SPF parameters involves the use of an improved simulation model of the studied electrical complex with the FC-AFE, on the basis of which the analysis of the THDU value in the common sections of the enterprise main step-down substation is carried out with various SPF parameters. The introduction of the SPF significantly reduced the THDU in the sections due to the shift of the resonance frequency to a safe zone, where there are no high-frequency harmonics of the FC-AFE network current. Due to this, emergency shutdowns of electrical equipment supplied from the same network as powerful electric drives with FC-AFE were excluded.
Keywords
power quality indicators, frequency converter, active rectifier, higher harmonics, electromagnetic compatibility, current resonance, specialized passive filter, in-plant power supply system, network frequency response
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