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<p>This paper presents a 0.7-MW high-current variable-voltage inductive load that is connected by a 12-pulse thyristor rectifier to the distribution system. In order to compensate at the point of common coupling over the load current range, a parallel hybrid filter (PHF) is used comprising two single-tuned passive filters for 11th and 13th harmonic and a second-order high-pass passive filter for 23th harmonic and DSTATCOM. According to the load reactive power variation, the DSTATCOM is used only to improve the displacement power factor (DPF) while passive filters are incapable of keeping DPF in acceptable values (greater than 0.98). Because of the distribution system voltage variation, it is assumed that voltage varies ± 5% of the network line voltage. A new comprehensive method is presented for the PHF design with simple equations based on accurate equalization of DSTATCOM maximum lead and lag currents (minimum rating and cost) in the fixed and variable network voltage. This equalization not only reduces the rating of DSTATCOM, but also the total power of passive filters. A network current TDD optimization is according to the PSO algorithm carried out with modeling of the system (presenting system equations) and using network harmonics current constraints in PSO loops which puts all network current harmonics in acceptable amounts. What’s more, harnessing PSO algorithm considerably reduces network current TDD in comparison with previous studies. MATLAB simulation results comprising DSTATCOM current and reactive power, network current TDD and harmonics, and other simulation results are presented to verify the better reactive power and harmonic performance of proposed method compared with other method.</p>

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Allocation of reactive power for parallel hybrid filter based on accurate equalization of DSTATCOM maximum lead and lag currents in network voltage variation

  • 期刊论文

  • 发表日期：

    2025年4月3日

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  • Amin Rahimnezhad Golafshani,
  • Mahmudreza Changizian,
  • Abbas Shoulaie

摘要

This paper presents a 0.7-MW high-current variable-voltage inductive load that is connected by a 12-pulse thyristor rectifier to the distribution system. In order to compensate at the point of common coupling over the load current range, a parallel hybrid filter (PHF) is used comprising two single-tuned passive filters for 11th and 13th harmonic and a second-order high-pass passive filter for 23th harmonic and DSTATCOM. According to the load reactive power variation, the DSTATCOM is used only to improve the displacement power factor (DPF) while passive filters are incapable of keeping DPF in acceptable values (greater than 0.98). Because of the distribution system voltage variation, it is assumed that voltage varies ± 5% of the network line voltage. A new comprehensive method is presented for the PHF design with simple equations based on accurate equalization of DSTATCOM maximum lead and lag currents (minimum rating and cost) in the fixed and variable network voltage. This equalization not only reduces the rating of DSTATCOM, but also the total power of passive filters. A network current TDD optimization is according to the PSO algorithm carried out with modeling of the system (presenting system equations) and using network harmonics current constraints in PSO loops which puts all network current harmonics in acceptable amounts. What’s more, harnessing PSO algorithm considerably reduces network current TDD in comparison with previous studies. MATLAB simulation results comprising DSTATCOM current and reactive power, network current TDD and harmonics, and other simulation results are presented to verify the better reactive power and harmonic performance of proposed method compared with other method.