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Simulation study of FACTS devices based on AC–AC modular multilevel hexagonal chopper

机译：基于AC-AC模块化多层六角斩波器的FACTS设备的仿真研究

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摘要

This study proposes a new range of flexible AC transmission system (FACTS) device based on direct AC-AC conversion, where the modular multilevel AC hexagonal chopper (M2AHC) is employed. The M2AHC is operated in quasi-two-level mode; and the heterodyne modulation is used to decouple voltage amplitude regulation from the phase-shift; thus, independent control of active and reactive powers is achieved. Then, a family of FACTS devices based on M2AHC that offers voltage, active power and reactive power flow control as both shunt and series compensators is analysed. The use of AC cell capacitors instead of DC capacitors in M2AHC makes its footprint much smaller and lighter than conventional AC-DC or DC-AC voltage source converter-based FACTS devices; hence, high reliability and extended service-life could be expected. The system modelling and controller design of the proposed FACTS devices are illustrated in a unified reference frame, considering different control modes, transient and unbalanced conditions. Simulation results are used to verify the feasibility of the proposed M2AHC-based FACTS device. These FACTS devices will be preferred over conventional counterpart for confined spaced applications such as the grid access of large-scale offshore wind farms and resolution of loop flow in megacities.
机译：本研究提出了一种新的基于直接AC-AC转换的柔性AC传输系统（FACTS）设备系列，其中采用了模块化的多级AC六角斩波器（M2AHC）。 M2AHC以准两级模式运行；外差调制用于使电压幅度调节与相移解耦。因此，实现了有功和无功的独立控制。然后，分析了基于M2AHC的FACTS器件系列，该器件在分流和串联补偿器均提供电压，有功功率和无功功率流控制。与传统的基于AC-DC或DC-AC电压源转换器的FACTS器件相比，在M2AHC中使用AC单元电容器代替DC电容器使其占地面积更小，更轻。因此，可以期待高可靠性和更长的使用寿命。建议的FACTS设备的系统建模和控制器设计在统一的参考框架中进行了说明，其中考虑了不同的控制模式，瞬态和不平衡条件。仿真结果用于验证所提出的基于M2AHC的FACTS装置的可行性。在有限的空间应用中，例如大型海上风电场的电网接入以及超大城市中环流的解决，这些FACTS设备将比传统的同类设备更为可取。

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