An electrical dissecting method of AC branch with FACTS for ancillary service assessment

This paper presents a new electrical dissecting method of AC branch installed with phase-shifter, which satisfies basic principles and laws of electric power network. With this method, the deep-seated electrical information between sources and flows, such as the contribution information of sources and flows, can be obtained. The dissected sub-branches are equivalent to the initial branch, and the dissecting procedure satisfies the various basic electrical laws. Mathematic formulae of this dissecting method have been presented in this paper. Example shows the method is effective and correct, which can not only provide accurate electrical information to assess ancillary services of phase-shifters, but also provide useful reference to the assessment of ancillary services with other flexible AC transmission devices.