研究目的
To investigate the response of a utility-scale PV inverter to grid voltage phase shift-type disturbances, focusing on the role of the phase-locked-loop (PLL) in modeling and experimental validation.
研究成果
The study successfully evaluated PV inverter responses to phase shift events through simulation and laboratory testing, showing that phase shifts cause voltage and current reductions, with distortions and potential inverter tripping at higher shifts. The PLL plays a critical role in the response. Findings provide insights for modeling PV inverters under fault conditions and suggest that future standards like IEEE 1547 revisions may improve ride-through capabilities, but further testing is needed.
研究不足
The simulations were conducted under resistive load conditions without a stiff grid connection, which may not fully represent real grid scenarios. Laboratory tests were limited to specific phase shift values and a single PV inverter model, potentially not generalizable to all inverters or grid conditions.
1：Experimental Design and Method Selection:
The study used both simulation and laboratory experiments. Simulations were conducted in MATLAB/Simulink to model a utility-scale PV inverter with a detailed PLL for grid synchronization. Laboratory testing involved using an OpalRT real-time simulator and a grid simulator to create phase shift disturbances with high repeatability.
2：Sample Selection and Data Sources:
The PV inverter model was based on an array of 1Soltech 1Sth-215-P 215 W PV panels. Laboratory tests used a commercially available 500 kW utility-scale PV inverter. Data included voltages and currents measured during phase shifts.
3：List of Experimental Equipment and Materials:
Equipment included MATLAB/Simulink software, OpalRT OP5142 real-time simulator, grid simulator, PV inverter, PV simulator, current sensors, oscilloscope, computer, and connecting cables.
4：Experimental Procedures and Operational Workflow:
For simulations, phase shifts of 15°, 30°, and 60° were injected into the grid voltage after steady-state operation. For laboratory tests, phase shifts were implemented using the OpalRT, and responses were captured with an oscilloscope triggered by the OpalRT.
5：Data Analysis Methods:
Data were analyzed by comparing simulation and experimental results for voltage and current responses to phase shifts, focusing on distortions and stability.
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