부산대학교 도서관

In power systems, reactive power is typically considered beneficial for voltage stability. Based on power transmission characteristics, it can be inferred that there is no difference in voltage stability enhanced by various sources (e.g., the conventional dual-loop controlled photovoltaic systems). However, experimental tests have shown that within the same system, converters with distinct control schemes or parameters do not contribute equally to the stability, even when the same amount reactive power is provided. In this context, the effectiveness of the reactive power from grid-following (GFL) and grid-forming (GFM) converters on stability is explored. Small-signal models are correspondingly derived. The exploration has revealed that the difference in reactive power distribution significantly affects the system stability. Experimental tests performed on a 3-kVA GFL converter and a 3-kVA GFM system confirm the analysis.