Influences of Large-scale Smart Charging Stations on Small-Signal Stability of Power Systems

Hui Cai, Junhui Huang, Haiqian Wang, Zhenjian Xie, Qiyu Chen, Timothy Littler

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Large-scale smart charging stations can effectively satisfy and control the charging demands of tremendous plug-in electric vehicles (PEVs). But
simultaneously their penetrations inevitably induce new challenges to the operation of power systems. In this paper, damping torque analysis (DTA) was employed to examine the effects of the integration of smart charging station on the dynamic stability of the transmission system. While the discussion has focused on the damping of power system oscillations in the transmission system, and the smart charging station in the distribution system can be considered as an equivalent one with the proper control connecting to the
specified bus. A single-machine infinite-bus power system with a smart charging station which denoted the equivalent of several ones was used for analysis. From the results obtained from DTA, it reveals that in the view of the damping ratio, the optimal charging capacity is better to be considered in the
design of the smart charging station. Under the proposed charging capacity, the power system can achieve the best maintained dynamic stability, and the damping ratio can reach the crest value. According to the established Phillips-Heffron model in the previous analysis, the phase compensation method
was utilized to design the stabilizer via the active and reactive power regulators of the smart charging station respectively. With the help of the stabilizers, damping of the system oscillation under certain operating conditions can be
significantly improved, and the power oscillation in the tie-line can be suppressed more quickly. The results of the case study are verified in the conclusions.
Original languageEnglish
Pages (from-to)2561-2574
Number of pages14
JournalProceedings of the CSEE
Issue number16
Publication statusPublished - 05 Jun 2014


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