Abstract
Microgrid (MG) is not only undergoing rapid upsurge and an effective combination of distributed generations (DGs)-based renewable energy sources, but it also fulfills a significant function in upgrading grid infrastructure. It is necessary for DGs, during and after any disturbances in the voltage, to stay connected in order to enhance the voltage, most importantly guaranteeing the stability of the power system. In this present context, the behavior of the distributed generations control systems has a significant impact on the MG performance. This paper investigates the effect of different control schemes of the inverter-based DG unit on the stable operation of MG after the occurrence of faults that lead to islanding events. In this paper, an appropriate control strategy is proposed to enhance the fault ride-through of MG. Within the scope of the study, the MG consists of a conventional diesel generator and an inverter-based DG unit. The MG also contains several load types; RLC load as a static load and induction motor as a dynamic load. The MATLAB Simulink is used to model the MG and its inverter control schemes. In order to assure MG stability, the variations of the voltage and frequency are possessed as key references. Results indicate that the control strategies of the inverter have a strong influence on the stability of MG. Moreover, the MG configuration with the proposed FRT resists fault effects for longer durations and this enhances the stability.
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Appendix
Appendix
1.1 Data of microgrid components
Base values Base MVA = 1 MVA, base voltage = 480 V Utility data at 34.5 kV bus: MVAsc = 100 MVA and X/R = 10 |
Transformer 3 MVA, 34.5 kV/480 V, Yg/Δ, 60 Hz Resistance and inductance at the HV side: 0.00083, 0.025 pu Resistance and inductance at the LV side: 0.00083, 0.025 pu |
Inverter control parameters For P–Q control scheme Kp = 0.05, Ki = 40 Current loop Kp = 5.25, Ki = 1000 For current injected control scheme Current loop Kp = 5.25, Ki = 1000 |
Filter impedance Zf = 0 + j0.25 pu |
DC voltage source Vdc = 1000 V |
Synchronous generator Nominal power: 0.75 MVA, Salient pole Nominal L–L voltage: 480 V Nominal frequency: 60 Hz Number of poles: 4 Stator resistance R s: 0.003 pu Leakage reactance Xl: 0.18 pu Direct axis reactance Xd: 1.305 pu Transient direct axis reactance X’d: 0.296 pu |
IM loads Comprised of three identical machines; the parameters for each machine Nominal power: 149.2 kVA (200 HP); squirrel cage rotor Nominal L–L voltage: 480 V Nominal frequency: 60 Hz No. of poles: 4 Stator resistance (Rs): 0.01982 Ω Stator inductance (Lls): 0.207 mH Rotor resistance (R′r): 0.0109 Ω Rotor inductance (L′lr): 0.207 mH Mutual inductance (Lm): 10.3 mH Moment of inertia: 3.1 kg m2 Friction factor: 0.048 Nms |
1.2 Matlab simulink models
Microgrid model:
Synchronous based DG:
Inverter-based DG:
Droop control-PQ scheme.
Droop control-current injected scheme;
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Alaboudy, A.H.K., Salem, A.A. & Abdelsalam, A.A. An efficient fault ride through capability for integrating inverter-based DG with microgrid to enhance the transient response. Electr Eng 104, 3091–3105 (2022). https://doi.org/10.1007/s00202-021-01442-y
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DOI: https://doi.org/10.1007/s00202-021-01442-y