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对含串联电容补偿的交直流并联输电系统,通过在整流站附加相应的控制信号可以削弱次同步振荡,以往在设计高压直流输电系统附加次同步振荡阻尼控制器时忽略了逆变侧对次同步振荡特性的影响。实际分析表明,逆变侧交流母线的强弱以及逆变站不同的控制方式对次同步振荡阻尼特性有显著影响。作者运用H∞鲁棒控制理论设计了高压直流输电系统次同步振荡阻尼控制器,把逆变侧交流短路阻抗变化、逆变站控制方式的改变以及系统运行条件变化所引起的系统模型幅频特性差异看作系统模型的不确定性,并把在可行变化范围内对应的不确定界用相对简单的频域函数描述,把设计次同步振荡阻尼控制器归结为求解H∞鲁棒控制理论的混合灵敏度问题。特征根分析与时域仿真计算表明所设计的阻尼控制器能在较大的运行条件变化范围内可有效地抑制次同步振荡。
For AC / DC parallel transmission system with series capacitor compensation, sub-synchronous oscillation can be weakened by adding the corresponding control signal at the rectifier station. In the past, the design of HVDC transmission system with subsynchronous oscillation damping controller ignores the inverter side-to-sub-synchronous Effect of oscillation characteristics. The actual analysis shows that the strength of inverter side AC busbar and the different control modes of inverter station have a significant impact on the sub-synchronous oscillation damping characteristics. The authors design a HOSC damping controller using H∞ robust control theory. The amplitude-frequency characteristics of the system model caused by the change of AC short-circuit impedance, the control mode change of the inverter station and the change of system operating conditions The difference is regarded as the uncertainty of the system model, and the corresponding uncertainties within the feasible range are described by relatively simple frequency-domain functions. The design of subsynchronous oscillation damping controller is summarized as a hybrid solution of H∞ robust control theory Sensitivity issues. Eigenanalysis and time-domain simulation results show that the designed damping controller can effectively suppress subsynchronous oscillations within a wide range of operating conditions.