A flexible asynchronous AC link (FASAL) system is a technology that interconnects two power system networks operating at the same or different frequencies. The FASAL system is a newly developed technology; therefore, it requires a thorough investigation under different unbalanced grid voltage conditions for better behavioral understanding and appropriate future controller design. In this paper, the FASAL system is analyzed under various symmetrical and asymmetrical unbalanced grid voltage conditions. Moreover, the performance of the back-to-back voltage source converter (VSC) based HVDC link is also analyzed to establish its comparison with the FASAL system under the same conditions. The FASAL and VSC-HVDC systems are modeled in PSCAD/EMTDC software environment. The simulation results illustrate that the FASAL system performance is better under transient as well as steady-state conditions. Furthermore, the reduction in power at the receiving end side is also lesser in the FASAL system. For example, a 10% sag contributes only a 15% dip in power in the FASAL system, whereas VSC-HVDC reports a 30% power dip for the same sag condition.

中文翻译：

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各种电网电压不平衡条件下柔性异步交流链路综合性能分析

灵活异步交流链路（FASAL）系统是一种互连两个以相同或不同频率运行的电力系统网络的技术。FASAL系统是一项新开发的技术；因此，需要在不同的不平衡电网电压条件下进行彻底的调查，以便更好地理解行为并进行适当的未来控制器设计。本文对FASAL系统在各种对称和不对称不平衡电网电压条件下进行了分析。此外，还分析了基于背靠背电压源换流器（VSC）的高压直流链路的性能，以在相同条件下与FASAL系统进行比较。FASAL 和 VSC-HVDC 系统在 PSCAD/EMTDC 软件环境中建模。仿真结果表明，FASAL 系统在瞬态和稳态条件下性能都更好。此外，FASAL系统中接收端侧的功率降低也较小。例如，FASAL 系统中 10% 的电压骤降仅导致功率骤降 15%，而 VSC-HVDC 报告相同电压骤降条件下的功率骤降 30%。