具有独立可调输出的双频双类型输出无线电力传输系统

The stability of the power grid with rich renewable energy resources (RESs) is increasingly challenged, as power generation is highly intermittent and also with the mix of multiple energy vectors (e.g., power-hydrogen) of distinct dynamics. Furthermore, predesigned stability margins considering certain operating points may be narrowed under varying conditions due to potential interactions. Although advanced control strategies like grid-forming (GFM) have been developed for individual converters to enhance stability, the system-level stability is still of concern, especially when GFM and grid-following (GFL) converters are installed. With the above, this article explores the stability of hybrid systems, and it has been revealed that the entire system can go beyond its stable regions when the GFL and GFM converters are operating at certain points (e.g., generating less power). Unfortunately, traditional parameter design schemes are difficult to deal with such stability issues in these systems. Thus, a parameter tuning method is proposed to find potential low-margin poles, update inappropriate parameters, and eventually enhance the system’s stability. Notably, with the derived small-signal models, the proposed method can tune the parameters of other multiconverter systems with GFM and GFL methods for a wide stable operating region. Experimental tests performed on a 6-kV A system have validated the analysis and the efficacy of the proposed design.