Research on the Performance Boundaries and Improvement Strategies of Oscillation Suppression in Continuously Adjustable Phase-Shifting Transformer

DU Jingyan; CHEN Junjie; LIN Jinjiao; WANG Chuyang

doi:10.12204/j.issn.1000-7229.2026.04.013

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Electric Power Construction ›› 2026, Vol. 47 ›› Issue (4) : 163-180. DOI: 10.12204/j.issn.1000-7229.2026.04.013

Research on the Performance Boundaries and Improvement Strategies of Oscillation Suppression in Continuously Adjustable Phase-Shifting Transformer

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Abstract

[Objective] To enhance the sub-synchronous oscillation suppression capability under high proportion of power electronic equipment conditions in power grids， promote the application of continuous tunable phase shifters in power flow regulation and oscillation suppression， clarify their oscillation suppression mechanism and improve their oscillation suppression performance. [Methods] This paper first analyzes the quantitative relationship among sub-synchronous oscillation， line current and phase shifter parameters in the line where the continuous tunable phase shifter is located， and uses this relationship to characterize its oscillation suppression performance boundary， revealing the limitations of the continuous tunable phase shifter's own oscillation suppression capability. Subsequently， an enhanced multi-frequency modulation strategy considering sub-synchronous modulation signals is proposed. To further broaden the oscillation suppression performance boundary of the continuous tunable phase shifter while avoiding harmonic pollution， a series capacitor compensated continuous tunable phase shifter is proposed， and the design method for series compensation capacitor is provided； additionally， to solve the accompanying power flow reversal problem， an open-closed loop integrated power flow regulation strategy is proposed. [Results] Simulation results show that the enhanced multi-frequency modulation strategy can reduce sub-synchronous oscillation to approximately 10%， but simultaneously causes certain harmonic pollution and reduces power quality； the comparison of oscillation suppression capabilities of tunable phase shifters based on traditional， enhanced multi-frequency modulation strategies and series compensation capacitor verifies the limitations of suppression capability of traditional continuous tunable phase shifter and the superiority of series capacitor compensated continuous tunable phase shifters in improving suppression performance. [Conclusions] The proposed enhanced multi-frequency modulation strategy effectively improves oscillation suppression capability but has harmonic pollution issues； the series capacitor compensated continuous tunable phase shifter can not only regulate grid power flow by controlling series voltage， but also provide same-frequency voltage with opposite phase to the oscillation source to suppress sub-synchronous oscillation. This broadens the oscillation suppression performance boundary while avoiding harmonic pollution， providing a new technical approach for power grid sub-synchronous oscillation suppression.

Key words

continuous tunable phase shifter / oscillation suppression / multi-frequency modulation strategy / series capacitor compensated phase shifter / power flow reversal / open-closed loop integrated power flow regulation strategy

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DU Jingyan , CHEN Junjie , LIN Jinjiao , et al. Research on the Performance Boundaries and Improvement Strategies of Oscillation Suppression in Continuously Adjustable Phase-Shifting Transformer[J]. Electric Power Construction. 2026, 47(4): 163-180 https://doi.org/10.12204/j.issn.1000-7229.2026.04.013

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