研究目的
Understanding the impact to distribution systems under fault conditions is necessary to develop approaches and prepare utility companies for outages. Applying faults on existing distribution systems with the purpose of studying their effects is neither safe nor a practical approach that could cause unwanted damage to the system.
研究成果
All methods were closely correlated in steady-state, but the transient response of the inverter was difficult to capture with a PV model and the physical device behavior could not be represented completely without incorporating it through PHIL. The most accurate simulations use the PV inverter but the additional overhead to run PHIL simulations make the Simulink option attractive when only approximate fault dynamics are needed.
研究不足
The physical hardware components often do not act as modeled and there can be differences in the dynamic power system results. Additionally, large distribution systems are difficult to model in RT PHIL, and circuit reduction techniques are necessary to decrease the amount of buses, lines, loads, etc.
1：Experimental Design and Method Selection:
MATLAB/Simulink/RT-Labs was used to simulate the reduced-order distribution system and three different faults are applied at three different bus locations in the distribution system. The use of Real-Time (RT) Power Hardware-in-the-Loop (PHIL) simulations was also used to further improve the fidelity of the model.
2：Sample Selection and Data Sources:
An industrial distribution feeder modelled in Open Distribution System SimulatorTM (OpenDSS) was used as the circuit of study. A circuit reduction technique was used to obtain an equivalent model that was converted to MATLAB/Simulink/RT-Labs and uploaded to an Opal-RT 5600 platform for the PHIL experiments with a PV inverter.
3：List of Experimental Equipment and Materials:
The hardware component for the RT PHIL is a physical PV inverter. A programmable PV simulator is used to emulate the solar array for the PHIL PV inverter.
4：Experimental Procedures and Operational Workflow:
The tests performed in this RT PHIL platform consist in introducing a fault at different points in the simulated distribution feeder and studying the behavior of the fault currents and the response of the hardware PV inverter.
5：Data Analysis Methods:
A comparison between OpenDSS simulation results and the Opal-RT experimental fault currents was conducted to determine the steady-state and dynamic accuracy of each method as well as the response of using simulated and hardware PV inverters.
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