System theoretical analysis of voltage stability in power electronic dominated hybridpower systems

由于常规同步发电机数量的减少、高压直流输电线路的安装以及可再生能源的大规模普及而引起的电力系统状况的变化，需要研究未来电力系统的动态和(电压)稳定性以及紧急控制在电压危急情况下的适用性。该项目旨在分析可再生能源渗透率的增加及其不同的控制可能性、先进的有源配电网控制策略和快速可控的高压直流输电换流器对整个电力系统动态和稳定性的影响，特别是长期电压稳定性。此外，还将模拟防止电压崩溃的控制机会，例如削减负荷或有功配电网的无功支持，以评估它们在面对这些变化的电网情况时对稳定快速下降的母线电压的影响。

Due to the changing conditions in power systems caused by decreasing number of conventional synchronous generators, the installation of HVDC+links and simultaneously the large-scale penetration of renewable energy sources, the dynamics and (voltage) stability of future power systems as well as the suitability of emergency controls for voltage critical situations need to be investigated. This projects aims at analysing the impact of increased renewable energy sources penetration and their different control possibilities, advanced active distribution networks control strategies and fast-controllable HVDC converters on overall power system dynamics and stability - in particular long-term voltage stability. Further, control opportunities for the prevention of voltage collapse, e.g., load curtailment or reactive power support of active distribution networks will be simulated in order to estimate their impact on stabilizing fast decreasing bus voltages when faced with these changing grid situation.