PSS和SVC联合抑制次同步振荡

Restraint of subsynchronous oscillation with PSS and SVC

针对静止无功补偿器(SVC)的附加次同步阻尼控制器(SSDC)无法抑制所有扭振模式的振荡,在励磁系统阻尼控制器(SEDC)基础上设计双输入多通道结构的改进电力系统稳定器(PSS)。由于PSS无法解决大扰动下的次同步振荡问题,提出利用PSS和SVC联合抑制次同步振荡的方案:SVC抑制主谐振点的振荡,其他扭振模式用改进PSS来解决。复转矩系数法、时域仿真法和Prony分析结果均表明两者联合抑制次同步振荡能够弥补双方的缺陷,在较宽频带内提高系统阻尼,对次同步振荡取得理想的抑制效果。

As the SSDC（Supplementary Subsynchronous Damping Controller） can not suppress all torsional vibration modes of oscillation,an improved dual-input multi-channel PSS is designed on the basis of the SEDC（Supplementary Excitation Damping Controller）.As PSS can not damp SSO（Subsynchronous Oscillation） by large disturbance,it is proposed to restrain SSO with PSS and SVC together：the oscillation of main resonance point by SVC and other torsional vibration modes by PSS.The complex torque coefficient method,time-domain simulation and Prony analysis show that,the proposed method has ideal effect in SSO restraint and improves the electrical damping in a wider broadband.