研究目的
To determine if assumptions about PV inverter tripping based on programmed voltage and frequency settings are valid and to inform stakeholders about the performance of solar PV inverters during grid transient stability events.
研究成果
The PV inverter's response to grid disturbances is influenced by phase shift and harmonic content, leading to miscalculations of frequency and erroneous tripping, regardless of ride-through settings. This highlights the need for improved inverter designs and detailed event logging for better grid reliability.
研究不足
The testing was limited to one type of PV inverter (not the newest model) and specific grid disturbance scenarios. The study did not include variability in solar resource or statistical analysis due to consistent results in repeated tests.
1：Experimental Design and Method Selection:
Laboratory-based evaluation using a 500 kW PV inverter tested with simulated grid disturbances representing different fault types and durations. The OpalRT real-time simulator generated reference waveforms for the grid simulator.
2：Sample Selection and Data Sources:
A single 500 kW utility-scale PV inverter was used as the equipment under test. Grid disturbance waveforms were derived from simulations and actual event data (Blue Cut Fire Event).
3：List of Experimental Equipment and Materials:
PV simulator (500 kW), grid simulator (500 kW bi-directional), OpalRT real-time simulator, oscilloscope for data acquisition.
4：Experimental Procedures and Operational Workflow:
The PV inverter was operated at half-rated power (250 kW). Grid disturbances were applied via the grid simulator based on OpalRT signals. Data on voltages and currents were recorded using an oscilloscope triggered by the OpalRT model.
5：Data Analysis Methods:
Analysis involved reviewing fault codes from the inverter interface and logs, and examining recorded waveforms to determine trip causes and inverter responses.
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