研究目的
To rigorously explore the DVS of inverter-based islanded MG with high penetrated IM loads following a fault and to propose an optimized reactive power support (ORPS) strategy for PV inverters to improve the DVS.
研究成果
The proposed ORPS strategy provides dynamic reactive current injection from PV inverters during voltage sag, improving DVS in islanded MGs with high IM load penetration. The strategy is economically viable, avoiding the need for expensive dynamic VAr support devices like D-STATCOM, and does not risk damaging the inverter due to overcurrent flow.
研究不足
The study focuses on short-term voltage stability and the impact of IM loads in islanded MGs. The applicability of the proposed strategy in larger or different types of grids is not explored. The study also does not address the potential impact of varying weather conditions on PV inverter performance.
1：Experimental Design and Method Selection:
The study involves the development of a detailed model of an inverter-based islanded MG with IM load to examine the DVS. Theoretical analysis and technical discussion are conducted to compare the conventional and proposed strategies.
2：Sample Selection and Data Sources:
The study uses a modified IEEE 4 bus test system as an autonomous MG, incorporating PV and battery energy storage systems, and an aggregated model of IM load.
3：List of Experimental Equipment and Materials:
The study involves PV inverters, battery energy storage inverters, and IM loads. Specific models and brands are not mentioned.
4：Experimental Procedures and Operational Workflow:
The study includes time domain simulation to analyze voltage stability, with a focus on the impact of IM load on DVS and the effectiveness of the proposed ORPS strategy.
5：Data Analysis Methods:
The study uses transient voltage severity index (TVSI) for quantitative performance analysis of voltage stability.
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