Impact of Inertia Emulation Based Modified HVDC Tie-Line for AGC Using Novel Cascaded Fractional Order Controller in Deregulated Hybrid Power System

Abstract

This article deals with the Automatic Generation Control (AGC) mechanism for an interconnected, deregulated hybrid power system. The physical generation constraints such as boiler dynamics, governor dead band (GDB) and generation rate constraints (GRC) are included for a more realistic approach. The integration of distributed generation (DG) systems is also considered to match with present scenario. The intermittency nature of the DGs ruins the system's inertia and dynamic behaviour. A novel cascaded fractional order controller configuration 2-DOF (FOPIλDN)-PDN is proposed for the AGC mechanism and a new quasi opposition based volleyball premier league (QVPL) algorithm is employed to optimize the controller gains. On the other hand, the inertia emulation strategy (IES) based modified HVDC tie-line is used parallel to the AC tie-line to retrace the power system's inertia. The impact of the proposed controller and IES based modified HVDC tie-line has been analysed by subjecting to several case studies. The effectiveness of the QVPL based proposed controller has also been tested by comparing it with the previously published works on the same platform.

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Correspondence to Sariki Murali.

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Appendix

Appendix

Thermal power plant: Tg = 0.08 s, Kr = 0.5, Tr = 10 s, Tt = 0.3 s, N1 = 0.8, N2 = 0.2/pi. Boiler dynamics: K1; K2; K3 = 0.85, 0.095 and 0.92 respectively, CB = 200, TD; TF = 0 s, 10 s, KIB = 0.030, TIB; TRB = 26 s, 69 s. Hydro power plant: TGH = 0.2 s, TR = 5 s, TRH = 28.75 s, TW = 1 s. Gas power plant: X = 0.6 s, Y = 1.0 s, b = 0.05 s, c = 1, TF = 0.23 s, TCR = 0.01 s, TCD = 0.2 s, RG = 2.4 Hz/pu MW. GTPP: g = 0.05, t = 0.1. Regulation: R = 2.4 Hz/pu. Damping constant: B = 0.545pu/Hz.,Power system: Kps = 120, Tps = 20. WTS: KWTS = 1, TWTS = 1.5 s. SPV: KSPV = 1, TSPV = 1.8 s. DEG: KDEG = 0.003, TDEG = 2 s. FC: KFC = 0.01, TFC = 4 s. AE: KAE = 0.002, TAE = 0.5 s. Tie-line: a12 = -Pr1/Pr2 = -1. IES: H = 4 s, SVSI = 600 MW, N = 2, C = 0.148mF, f = 60 Hz,VDC = 300KV, IDC = 0.5pu, saturation =  ± 15%.

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Murali, S., Shankar, R. Impact of Inertia Emulation Based Modified HVDC Tie-Line for AGC Using Novel Cascaded Fractional Order Controller in Deregulated Hybrid Power System. J. Electr. Eng. Technol. (2021). https://doi.org/10.1007/s42835-021-00666-z

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Keywords

  • 2-DOF (FOPIλDN)-PDN
  • AGC
  • DG
  • IES
  • QVPL