To adapt to the characteristics of new energy long-distance transmission, this paper proposes a scheme of multi-fed voltage source converter grid connection and line-commutated converter transmission for a regional large energy base. First, the feasibility of this multi-infeed direct current (DC) transmission scheme is discussed. Then, the performance characteristics of the multi-infeed DC and other traditional transmission technologies are compared and analysed. In addition, the economic benefits of the multi-infeed DC project are evaluated. To study the characteristics of new energy multi-infeed DC power transmission mode, a long-distance energy transmission system based on multi-infeed DC power transmission mode is built using DIgSilent software. On the basis of the continuous power flow method, the static characteristics of the system are studied. Based on the time-domain simulation method, the transient characteristics of the system are studied. The results show that multi-infeed DC has great advantages in large-scale regional new energy long-distance transmission.

中文翻译：

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新能源多馈直流电网并网可行性研究

为适应新能源长距离输电的特点，针对区域性大型能源基地，提出了多馈电压源变流器并网和换向换流的输电方案。首先，讨论了这种多馈直流电（DC）传输方案的可行性。然后，对多馈直流和其他传统传输技术的性能特征进行了比较和分析。此外，还评估了多馈DC项目的经济效益。为了研究新能源多馈直流输电方式的特点，利用DIgSilent软件建立了基于多馈直流输电方式的远距离输电系统。在连续潮流法的基础上，研究了系统的静态特性。基于时域仿真方法，研究了系统的暂态特性。结果表明，多馈直流在大型区域新能源长距离输电中具有很大的优势。