Multi-functional UPFC control implemented by a multivariable sampled regulator

Abstract

Multi‐functional UPFC control has been implemented by multiple controllers which may not effectively cope with the possible interactions among the multiple UPFC control functions. Hence, in this paper, a multivariable sampled regulator (SR) is suggested to perform the UPFC multiple control functions. The design of the SR can ensure decoupled control actions so as to achieve a satisfactory control performance and closed‐loop system stability. Furthermore, its design only requires knowledge of the open‐loop system step response—a non‐parametric model—which is particularly attractive for this application since, in power systems, field tests to obtain non‐parametric models are usually much easier to apply than the development of parametric models. In the paper, a study case of an example power system installed with a UPFC is presented.

Effects of different generator reactive power limits representation on load margins

“…In 24 the effectiveness of SSSC and TCSC in characterizing machines for stability limit enhancement is verified. According to, 25,26 devices like UPFC or SVC for power flow and AC voltage regulation provide a satisfactory control performance and guarantee closed-loop system stability.…”