This paper presents a novel distributed voltage control method for multi-terminal direct current (MTDC) systems based on the average consensus algorithm. The proposed method combines the idea of secondary integral voltage control and regulator synchronization problem. It realizes adjustable tradeoff between two conflicting control objectives, that is, voltage regulation and power sharing. The proposed control algorithm only needs a low-bandwidth communication between two adjacent voltage source converters (VSCs) and local information to work effectively. Moreover, regarding the system dynamic response, a parameter tuning method for the proposed controller is provided to achieve the fastest convergence of the distributed control algorithm. This paper also develops a small-signal dynamic model for VSC-MTDC systems with distributed controllers to evaluate the system dynamic performance. The proposed method is validated by time-domain simulation of a 4-terminal VSC-MTDC system. The simulation results show that flexible tradeoff between voltage regulation and power sharing can be achieved under necessary constraints on the DC bus voltages and power sharing ratio.

中文翻译：

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考虑电压调节和功率共享之间折衷的 VSC-MTDC 系统分布式控制

本文提出了一种基于平均一致性算法的多端直流 (MTDC) 系统分布式电压控制新方法。所提出的方法结合了二次积分电压控制和稳压器同步问题的思想。它实现了两个相互冲突的控制目标之间的可调权衡，即电压调节和功率共享。所提出的控制算法只需要两个相邻电压源转换器 (VSC) 和本地信息之间的低带宽通信即可有效工作。此外，关于系统动态响应，提出控制器的参数调整方法，以实现分布式控制算法的最快收敛。本文还为具有分布式控制器的 VSC-MTDC 系统开发了一个小信号动态模型，以评估系统动态性能。所提出的方法通过 4 端 VSC-MTDC 系统的时域仿真得到验证。仿真结果表明，在必要的直流母线电压和功率分配比约束下，可以实现电压调节和功率分配之间的灵活权衡。