本論文探討串聯補償輸電系統之次同步共振穩定度，並提出結合靜態同步串聯補償器與固態氧化物燃料電池之改善架構。本文建立兩種研究系統，第一種架構用以驗證靜態同步串聯補償器結合固態氧化物燃料電池及比例-積分-微分阻尼控制器對系統穩定度之影響，第二種架構進一步加入雙饋式感應發電機浮動式離岸風場，比較無靜態同步串聯補償器結合固態氧化物燃料電池、有靜態同步串聯補償器結合固態氧化物燃料電池、加入比例-積分-微分阻尼控制器及加入螢火蟲演算法最佳化比例-積分-微分阻尼控制器等情況。本文以特徵值、根軌跡與時域響應分析系統穩定度，第一種架構另包含參與因子與頻域分析。模擬結果顯示，所提出架構可提升系統阻尼與扭轉模態穩定裕度，進而有效抑制次同步共振。

This paper investigates the stability of subsynchronous resonance (SSR) in a series-compensated transmission system and proposes an improved configuration combining a solid oxide fuel cell (SOFC) with a static synchronous series compensator (SSSC). Two study systems are established in this thesis. The first system is used to verify the influence of the SSSC-SOFC configuration and a proportional-integral-derivative (PID) damping controller on system stability. The second system further incorporates a doubly-fed induction generator (DFIG)-based floating offshore wind farm and compares the stability characteristics under four conditions: without SSSC-SOFC, with SSSC-SOFC, with a PID damping controller, and with a firefly algorithm-optimized PID damping controller (FA-PID). Eigenvalue analysis, root locus analysis, and time-domain responses are used to evaluate system stability, while participation factor and frequency-domain analyses are additionally performed for the first system. Simulation results show that the proposed configuration can improve system damping and the stability margin of torsional modes, thereby effectively suppressing SSR.

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