Critical cyber parameters in hybrid power systems with VSP-based virtual inertia emulation: Theoretical approach and mitigation strategy
With the large-scale integration of low-inertia renewable energy sources, increasing the virtual inertia of the power system by using Virtual Synchronous Power (VSP) technology through the control of HVDC converter stations is a promising approach. Considering the non-negligible influence of critica...
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Veröffentlicht in: | International journal of electrical power & energy systems 2023-05, Vol.147, p.108877, Article 108877 |
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Sprache: | eng |
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Zusammenfassung: | With the large-scale integration of low-inertia renewable energy sources, increasing the virtual inertia of the power system by using Virtual Synchronous Power (VSP) technology through the control of HVDC converter stations is a promising approach. Considering the non-negligible influence of critical cyber parameters on the stability of the hybrid power system with VSP-based inertial emulation, this paper first proposes a new evaluation framework that fully considers the impact of the measurement period and various communication delays, based on mainstream measuring devices and communication standard. Theoretical results have been carried out for the stability analysis that the characteristics of the physical system and the power modulation controller have been taken into account. Further, we propose a mitigation method through a modified Smith compensator to reduce the impact of communication delays especially the malicious ones. To this end, we conduct numerical simulations on different measurement periods and three types of communication delays. A comparison study is performed on the conventional AC system, the AC/DC system and the hybrid AC/HVDC system with VSP-based inertia emulation. It shows that different measurement periods and communication delays could significantly influence the hybrid AC/HVDC system dynamic performance and even frequency stability. Fortunately, our mitigation method could help increase the robustness of the whole system and achieve frequency control targets even in the case of malicious delays.
•Developing a new evaluation framework and stability criteria for the new LFC.•The new LFC has higher demands on cyber parameters and requires more protection.•Having proposed a modified Smith compensator for mitigating malicious time delays.•Validated effectiveness of theoretical results and the proposed mitigation scheme. |
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ISSN: | 0142-0615 1879-3517 |
DOI: | 10.1016/j.ijepes.2022.108877 |