Small-signal Stability Analysis and Control System Design of a Meshed Multi-terminal High-Voltage Direct Current Grid with a Current Flow Controller
Small-signal Stability Analysis and Control System Design of a Meshed Multi-terminal High-Voltage Direct Current Grid with a Current Flow Controller
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DOI：
10.1080/15325008.2016.1153750
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发表时间：
2016-05
影响因子：
1.5
通讯作者：
N. Deng;Puyu Wang;Xiao-Ping Zhang
中科院分区：
文献类型：
--
作者：
N. Deng;Puyu Wang;Xiao-Ping Zhang
摘要直流电流控制器可以对多端高压直流电网中的分支电流进行控制。然而，直流电流控制器的引入可能会影响多端HVDC的稳定性。因此，有必要研究具有直流电流控制器的多端直流输电系统的动态特性。本文重点研究了一个装有电流互感器的三端网状直流输电系统的小干扰稳定性分析。建立了具有直流电流控制器的多端高压直流输电系统的小信号模型。在小信号模型稳定性分析的基础上，设计了直流电流控制器的控制系统，满足了系统稳定性要求。最后，在实时数字仿真器上进行了非线性动态仿真，并将仿真结果与理论模型进行了比较，以验证所提出的直流电流控制器的控制器。此外，直流电流控制器对网状多端直流电网的动态影响进行了讨论。
Abstract A DC current flow controller can provide branch current control in a meshed multi-terminal high-voltage direct current (HVDC) grid. However, the introduction of a DC current flow controller may affect the stability of the multi-terminal HVDC. Hence, the dynamic characteristics of the multi-terminal HVDC with the DC current flow controller should be investigated. This article focuses on small-signal stability analysis of a current flow controller-equipped meshed three-terminal HVDC system. A small-signal model for the multi-terminal HVDC with the DC current flow controller is established. Based on the stability analysis of the small-signal model, a control system is designed for the DC current flow controller, fulfilling the system stability requirement. Finally, non-linear dynamic simulations on the real-time digital simulator are conducted, and simulation results are compared with a theoretical model to validate the proposed controller for the DC current flow controller. In addition, dynamic impacts of the DC current flow controller on the meshed multi-terminal HVDC grid are discussed.