Limitations of the applicability of the concept of hybrid renewable energy source plant in practical implementation

Hybrid renewable energy source (HRES) plants have been recognized as a promising option for obtaining stable power production from renewable energy sources. The research on HRES plants has been mostly focused on the economic benefits of this concept. Much less attention has been paid to the influence of economic dispatch of HRES plants on system dynamic performance. This paper illustrates the necessity of defining the optimal technology mix in the HRES plant for certain system conditions from the perspective of both economy and system dynamic behaviour. In this study, the focus is on transient system stability. Furthermore, the methodology for developing dynamic equivalent of the whole HRES plant for transient stability studies in the form of a low-order transfer function model is presented. Illustrative results are obtained using an HRES plant consisting of several non-dispatchable renewable generation technologies.