A DC current flow controller for meshed modular multilevel converter multiterminal HVDC grids
A DC current flow controller for meshed modular multilevel converter multiterminal HVDC grids
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DOI：
10.17775/cseejpes.2015.00006
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发表时间：
2015-05
影响因子：
7.1
通讯作者：
N. Deng;Puyu Wang;Xiao-Ping Zhang;G. Tang;Junzheng Cao
中科院分区：
文献类型：
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作者：
N. Deng;Puyu Wang;Xiao-Ping Zhang;G. Tang;Junzheng Cao
提出了一种新型直流电流控制器（CFC）的设计方案，并对该控制器在网状多端HVDC （MTDC）电网中平衡和调节直流支路电流的控制性能进行了评价。直流CFC由两个相同的全桥DC-DC转换器组成，两个转换器的电容器并联连接。由于相同的桥式转换器拓扑，直流CFC的可扩展性很容易实现；由于其简单的物理结构和低额定电压，这种直流CFC的成本也相对较低。在基于模块化多电平变换器（MMC）的3端网状高压直流电网上测试了直流CFC的控制性能。利用所提出的直流CFC控制策略实现了MTDC网格直流支路电流的控制，并通过实时数字模拟器（RTDS）的实例研究进行了验证。
This paper proposes the design of a novel DC current flow controller (CFC) and evaluates the control performance of balancing and regulating the DC branch currents using the DC CFC in a meshed multi-terminal HVDC (MTDC) grid. The DC CFC consists of two identical full bridge DC-DC converters with the capacitors of the two converters being connected in parallel. The scalability of the DC CFC is easily achievable due to the identical bridge converter topology; the cost of this DC CFC is also relatively low due to its simple physical structure and low voltage ratings. The control performance of the DC CFC is tested on a meshed 3-terminal (3-T) HVDC grid, which is based on modular multilevel converters (MMC). The DC branch current control in the meshed MTDC grid is achieved using the proposed control strategy of the DC CFC, and is verified through case studies on the real-time digital simulator (RTDS).