Study on Three-Phase Photovoltaic Systems under Grid Faults
Power system simulation, Power system faults, Photovoltaic power generation, Photovoltaic systems, Circuit faults, Voltage control, Reactive power, Power conversion, Software packages, Control systems, Short-circuit currents, Photovoltaic power systems, Power control, Power generation control, Power generation faults, Power grids, Fault occurrence, Three-phase photovoltaic systems, Grid faults, Matlab/Simulink environment, Asymmetrical grid faults, Symmetrical grid faults, Fault response performance, Solar irradiance, Grid codes, Power control strategies, Utility grid conditions, Grid fault types, Point of common coupling, Short circuit faults, Power grid, Grid-connected PV systems, PV systems performance, Grid fault type
The work starts with a short overview of grid requirements for photovoltaic (PV) systems and control structures of grid-connected PV power systems. Advanced control strategies for PV power systems are presented next, to enhance the integration of this technology. The aim of this work is to investigate the response of the three-phase PV systems during symmetrical and asymmetrical grid faults. The performance of a three-phase grid-connected PV system under grid faults is investigated by performing simulations in Matlab and Simulink for a typical medium voltage (MV) distribution system, taking into account the factors of ambient temperature and solar irradiance, grid codes, power control strategies and utility grid conditions. Our findings show that the PV array, the PV inverter and the point of common coupling (PCC) of the grid-connected PV system are perturbed by grid fault events. The impact of grid faults on PV systems depends on the fault type and less on the fault distance. Thus, symmetrical faults have a higher impact on PV systems performance than asymmetrical faults, both at the PCC and inside the grid-connected PV array. To analyze the PV system during faults on utility power grid and to determine the effects of faults as a function of the location where the fault occurs, the simulation results are presented starting from the PCC, followed by the voltage source converter (VSC) and boost converter and continuing with the PV array. The response and the comparison of the three-phase PV system operation during various types of short circuit grid faults such as symmetrical grid faults (three-phase faults) and unsymmetrical grid faults (unbalanced faults) are discussed and presented graphically.
Please cite my paper in your work: I. V. Banu and M. Istrate, "Study on three-phase photovoltaic systems under grid faults," 2014 International Conference and Exposition on Electrical and Power Engineering (EPE), Iasi, 2014, pp. 1132-1137. doi: 10.1109/ICEPE.2014.6970086 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6970086&isnumber=6969853
1. Open the "Banu_power_PVarray_grid_EPE2014_.slx" file with Matlab R2014a 64 bit version or a newer Matlab release. 2. To simulate various grid faults on PV System see the settings of the "Fault" variant subsystem block (Banu_power_PVarray_grid_EPE2014_/20kV Utility Grid/Fault) in Model Properties (File -> Model Properties -> Model Properties -> Callbacks -> PreLoadFcn* (Model pre-load function)): MPPT_IncCond=Simulink.Variant('MPPT_MODE==1') MPPT_PandO=Simulink.Variant('MPPT_MODE==2') MPPT_IncCond_IR=Simulink.Variant('MPPT_MODE==3') MPPT_MODE=1 Without_FAULT=Simulink.Variant('FAULT_MODE==1') Single_phases_FAULT=Simulink.Variant('FAULT_MODE==2') Double_phases_FAULT=Simulink.Variant('FAULT_MODE==3') Double_phases_ground_FAULT=Simulink.Variant('FAULT_MODE==4') Three_phases_FAULT=Simulink.Variant('FAULT_MODE==5') Three_phases_ground_FAULT=Simulink.Variant('FAULT_MODE==6') FAULT_MODE=1 3. For more details about the Variant Subsystems see the Matlab Documentation Center: https://www.mathworks.com/help/simulink/variant-systems.html or https://www.mathworks.com/help/simulink/examples/variant-subsystems.html