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Control of interlinking converters in hybrid AC/DC grids: network stability and scalability
IEEE Transactions on Power Systems ( IF 6.6 ) Pub Date : 2021-01-01 , DOI: 10.1109/tpwrs.2020.3032471
Jeremy D. Watson , Ioannis Lestas

Hybrid AC/DC networks are an effective solution for future power systems, due to their ability to combine advantages of both AC and DC networks. However, they bring new technological challenges, one key area being the control of such a network. The network, and especially the interlinking converter (ILC), must be controlled to ensure that the DC and AC subsystems coordinate to stabilize the network and allocate power appropriately. This is an area which has attracted considerable recent interest due to the non-triviality of the control design. One promising tool is passivity theory which allows the derivation of decentralized conditions through which the stability of the network can be guaranteed. This paper investigates the application of a passivity framework to AC/DC grids, using a typical lossless line assumption. By ensuring that an appropriately formulated passivity condition is satisfied by the AC and DC buses, and the interlinking converter, the stability of the interconnection can be guaranteed. We also discuss how the ILC controller may be designed to achieve an appropriate power allocation between AC and DC sources. Simulation results demonstrate that the proposed ILC control design regulates the frequency and voltages of the hybrid AC/DC network with a stable operation maintained.

中文翻译:

混合交流/直流电网中互连转换器的控制:网络稳定性和可扩展性

混合交流/直流网络是未来电力系统的有效解决方案,因为它们能够结合交流和直流网络的优势。然而,它们带来了新的技术挑战,其中一个关键领域是对此类网络的控制。必须控制网络,尤其是互连转换器 (ILC),以确保直流和交流子系统协调以稳定网络并适当分配功率。由于控制设计的非平凡性,这个领域最近引起了相当大的兴趣。一个有前途的工具是被动理论,它允许推导分散的条件,通过这些条件可以保证网络的稳定性。本文使用典型的无损线路假设,研究了无源框架在 AC/DC 电网中的应用。通过确保交流和直流母线以及互连转换器满足适当制定的无源条件,可以保证互连的稳定性。我们还讨论了如何设计 ILC 控制器以实现交流和直流电源之间的适当功率分配。仿真结果表明,所提出的 ILC 控制设计可在保持稳定运行的情况下调节混合 AC/DC 网络的频率和电压。
更新日期:2021-01-01
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