Research Status and Challenges of Wide-band Oscillation in Flexible Low-frequency Transmission System
Flexible low-frequency transmission system contains power electronic equipment such as AC/AC converters,which leads to the dynamic coupling of the control link in a wide frequency band,and then results in wide-band oscilla-tion problems.At the same time,compared with the DC transmission system,the flexible low-frequency transmission system exhibits inter-frequency interaction characteristics.Therefore,its dynamic characteristics are more complex,and the problem of wide-band dynamic interaction is more prominent.Solving the wide-band oscillation problem of the sys-tem is an important prerequisite for system stability.First,it is expounded that the flexible low-frequency transmission system can be applied to three types of power transmission scenarios,and on this basis,the wide-band dynamic interac-tion processes that may exist in the system under different application scenarios and the oscillation phenomenon that exists in projects are analyzed.Then,the wide-band oscillation problem and suppression strategies of flexible low-frequency transmission system are summarized,and the deficiencies in the current research on wide-band oscillation analysis and suppression are pointed out.Finally,the prospects in oscillation outlook,mechanism and suppression meth-ods of the wide-band oscillation in the flexible low-frequency transmission system are put forward,providing reference for the follow-up research on the wide-band oscillation of the flexible low-frequency transmission system.
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