![]() ![]() Network devices in the data layer only remain the function of forwarding data, and the function of calculating routes is centralized in the control layer. SDN separates the function of the control layer and data layer. ![]() The IP-based network combines the function of the control layer and the data layer in the forwarding devices, which makes it difficult for researchers to test advanced control methods and hinders the innovation of network structure. The development of the communication network structure of microgrid mainly includes three stages, i.e., IP-based network, software-defined network (SDN) ( Nunes et al., 2014 Kreutz et al., 2015), and a polymorphic network with full-dimensional definition ( Hu et al., 2020, 2022 Zhang et al., 2022). The distributed secondary control strategy relies on advanced communication facilities and network structure to exchange neighbor information. For microgrids with a high proportion of new energy and power electronic devices, distributed secondary control ( Bidram et al., 2014) has attracted wide attention as an effective strategy to maintain voltage and frequency stability. ![]() Since power electronic devices cannot provide the inertia from generators with rotors, the frequency of microgrids is more susceptible to be disturbed. With the increase of the proportion of new energy, a large number of power electronic devices, such as rectifiers and inverters, have appeared in the microgrid to replace original generators with the rotor to generate power. As an important part of the new electric power system, microgrid integrates geographically dispersed, intermittent and random new energy, and internal energy storage devices can adjust the flow of electric energy flexibly ( Zhou J. et al., 2021 Wang et al., 2021). With the rapid development of power electronic devices and new energy technology, the power system has gradually transitioned to the stage of a new electric power system characterized by a high proportion of new energy and power electronic devices ( Zhou et al., 2020 Tang et al., 2022). Finally, a microgrid consisting of six inverter-based DGs is taken as an example to validate the effectiveness of the strategy against unbounded attacks. Meanwhile, the unbounded attack depending on voltage and frequency estimation difference is suppressed to a nearly bounded attack. The strategy can maintain the stability of voltage and frequency under unbounded attacks and then greatly suppress the state estimation difference of voltage and frequency. In this study, a discrete-time resilient-distributed secondary control strategy is designed to resist potential unbounded false data injection (FDI) attacks, which introduces a virtual network layer interconnecting the control network layer to form a layered network. Due to the improvement of network openness, external cyberattacks are more likely to tamper with the neighbor information transmitted in the cooperative control system. This study proposes a polymorphic cooperative control system for microgrid consisting of a service layer, a control layer, a data layer, and a power layer to apply a resilient-distributed secondary control strategy to distributed generators (DGs) from different manufacturers more conveniently.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |