Using STATCOM with Energy Storage to Enhance AC-DC System Stability
Abstract: UHVDC has been
rapidly developed for its large conveying capacity, small net loss and easy power
control, which can solve the problem of the uneven distribution of load and
energy with great economy. However, with DC transmission access, the power
system must have a strong ability of reactive power support to cope with the
possibility of transient voltage problem. At the same time, regional power oscillation
issue also can’t be ignored. Considering that the STATCOM device, as a type of
parallel FACTS, can only provide dynamic reactive power to support the system
voltage and cannot undertake active regulation and control to damp system power
oscillation problem, STATCOM with energy storage is presented in this paper to
solve both problem of transient voltage and power oscillation in AC-DC hybrid system.
In view of the central China province power grid planning, possible serious
faults of the system were analyzed. The simulation results show that STATCOM
with energy storage cannot only effectively support the system transient
voltage and promote voltage of dc inverter station to avoid DC block caused by
commutation failure, but also can significantly enhance the system damping and
restrain regional power oscillation in case of system failure.
Author: Zheng Xu
Journal Code: jptkomputergg160183
