Bank Harmonic Filters Operation in Power Supply System Cases Studies

  
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The vertical line indicates the instance of the 5th harmonic filter connection Figure 3. Diagram of the power system with the designed group of single-tuned filters for system with DC drive supplied by 6-pulse controlled rectifier:PN = 22kW, UN = 440V, IN = 56, 2A, J = 2, 7kgm2, Rt = 0, 465 ©, Lt = 15, 345mH, nN = 1500 r/min, k = 2, 62 .
Bank Harmonic Filters Operation in Power Supply System Cases Studies - schematic

The voltage-current waveforms and spectrum before and after connecting the filters (U1/I1 basic voltage/ current harmonic; Uh/Ih h. order voltage/current component Figure 9. The double-tuned filter and its essential frequency characteristics;the basic configuration and frequency characteristics of: the series part, parallel part, and the whole filter ( ‰R angular resonance frequency of the parallel part; ‰S angular resonance frequency of the series part; ‰n1, ‰n2 tuned angular frequencies of the double-tuned filter; equation 9 R 0). Figure 14. Frequency-impedance characteristics of: a) the power network equivalent impedance (ZS), the resultant impedance of two 3rd harmonic filters (Z2x3h), the C-type filter impedance (ZCfilter), the resultant impedance of two 3rd harmonic filters and the C-type filter (ZF); b) the impedance seen from the load terminals: without filters (ZS), the network equivalent impedance and two 3rd harmonic filters impedance connected in parallel (Zs|Z2x3h), and parallel connection of the network equivalent impedance, two 3rd harmonic filters and the C-type filter impedances (Zs|Z2x3h|ZCfilter) Figure 16. Voltage and current characteristics, spectrums and THD factors at 110 kV side. The graphs show two time characteristics: 10 min. averaged values (blue) and 10 ms maximum values (yellow) Figure 17. Current characteristics, spectrums and THDI factors of Arc-furnace and C-type filter. The graphs show two...



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