研究目的
Investigating the islanding detection techniques for Grid-connected Photo-Voltaic systems based on the observation of the DC-Link-Voltage Source Converter (VSC) and proposing a method for detecting islanding based on rise or fall of DC-Link-Voltage for excess generation and under generation conditions.
研究成果
The experimental results demonstrate that the DC-Link-Voltage method effectively detects islanding conditions within a short period of 0.25 seconds, proving to be a novel and efficient solution for islanding detection under all operating conditions of the grid-tied PV system.
研究不足
The study focuses on the DC-Link-Voltage method for islanding detection, which may have limitations in scenarios where local loads closely match the Distributed-Generator output power. The effectiveness of the method under varying grid conditions and with different types of loads could be further explored.
1：Experimental Design and Method Selection:
The study employs the DC-Link-Voltage method for islanding detection, comparing its effectiveness with Under/over Frequency/Voltage and ROCOF methods. The methodology involves observing the DC-Link-Voltage Source Converter (VSC) for detecting islanding conditions.
2：Sample Selection and Data Sources:
The experiment uses a Grid-connected Photo-Voltaic system setup to simulate islanding conditions under excess and under generation scenarios.
3：List of Experimental Equipment and Materials:
The setup includes PV arrays, boost converters, inverters, utility grids, and various loads to simulate different generation and consumption scenarios.
4：Experimental Procedures and Operational Workflow:
The procedure involves isolating the PV system from the grid under excess and under generation conditions and observing the DC-Link-Voltage changes to detect islanding.
5：Data Analysis Methods:
The analysis involves comparing the DC-Link-Voltage changes against preset threshold values to determine islanding conditions, with detection times recorded for evaluation.
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