扭转振荡 meaning in English

torsional oscillation

Torsional interaction exists between hvdc converters and turbine - generators , and negative electrical damping provided by hvdc may cause subsynchronous oscillation ( sso ) that can lead to turbine - generator shaft failure and electrical instability at oscillation frequencies lower than the fundamental system frequency
高压直流输电( high - voltage - direct - current - - - - hvdc )系统与临近同步发电机组之间存在着扭振相互作用， hvdc的电气负阻尼作用有可能引起机组在次同步频率范围的扭转振荡。
On the contrary , because of the effect of positive damping provided by the inverter , the unit near a inveter will have no subsynchronous oscillation risk . based on the same method described above , a damping study is carried out for a hybrid ac / dc system , which include a hvdc link and an ac transmission line in parallel
研究表明，系统整流站附近的同步发电机组要承受电气负阻尼作用，因此有可能引起机组低频扭转振荡模式失稳；而hvdc的逆变站向其临近同步发电机组提供正阻尼，因而机组不存在次同步振荡危险。