CAJ | 학술논문

并列同型的多台汽轮机组通过带串补线路送出时可能发生次同步谐振(subsynchronous resonance ，SSR)。出力不均衡时，各机组轴系扭振行为不一致，在幅值和相位上均有差别。以双机系统为例，对并列多机系统发生 SSR 时各机组轴系扭振行为的差异进行了研究。时域仿真结果表明，将各机组发电机转速均取作输入信号时，仅采用静止同步补偿器(static var compensator，STATCOM)便可抑制所有机组的轴系扭振，但是抑制速度缓慢；以网侧 STATCOM 为主、机侧附加励磁阻尼控制(supplementary excitation damping， SEDC)为辅的联合 SSR 抑制措施可以结合 SEDC 和STATCOM 各自作为 SSR 抑制措施的优点，快速有效地抑制多机系统SSR。
병렬동형적다태기륜궤조통과대천보선로송출시가능발생차동보해진(subsynchronous resonance ，SSR)。출력불균형시，각궤조축계뉴진행위불일치，재폭치화상위상균유차별。이쌍궤계통위례，대병렬다궤계통발생 SSR 시각궤조축계뉴진행위적차이진행료연구。시역방진결과표명，장각궤조발전궤전속균취작수입신호시，부채용정지동보보상기(static var compensator，STATCOM)편가억제소유궤조적축계뉴진，단시억제속도완만；이망측 STATCOM 위주、궤측부가려자조니공제(supplementary excitation damping， SEDC)위보적연합 SSR 억제조시가이결합 SEDC 화STATCOM 각자작위 SSR 억제조시적우점，쾌속유효지억제다궤계통SSR。
When the outputs of parallel-operated multi steam turbine generator units in the same type are sent out via a transmission line with serial compensation, the subsynchronous resonance (SSR) may occur. When unequally loaded, the shafting torsional vibrations are different one another in amplitudes and phases. Taking a parallel-operated two-machine system composed of generators in the same type for example, the differences between torsional vibrations of the two shaftings under SSR are researched. Time-domain simulation results show that when rotating speed deviations of respective generators are taken as input signals, the torsional vibrations of all shaftings can be damped by using static var compensator (STATCOM) only, however the damping speed is slow; the combined damping measure composed of the STATCOM at grid side as the main means and the supplementary excitation damping control (SEDC) at generator side as the auxiliary means can damp SSR in multi generation unit system rapidly and effectively, meanwhile respective advantages of the two means in damping SSR can be brought into play.