【摘要】 直流电网中的电压大小不仅能够反映整个系统的稳定程度,还与各换流站间的能量分布密切相关,因此直流电网的控制主要在于系统直流电压的控制。该文在详细分析直流输电系统网络约束和换流站约束的基础上,提出了基于能量均衡分布的直流电网多点电压控制方法。该方法可有效解决多点电压控制系统中各换流站约束和网络约束不一致的问题,即该方法既可保证网络约束中各节点变量的独立性又可保证换流站约束中各控制变量的相关性。文中还以五端直流电网为例,在PSCAD中进行模型搭建和仿真计算,通过系统在正常运行和N–1故障运行两种情况下的响应结果,证明文章所提理论的正确性与有效性。该文结论可为以后直流电网的多点电压控制提供理论依据。更多还原

【Abstract】 In DC grid, voltage can not only reflect the whole system’s stability, but also has relationship with the converts’ energy, so voltage control is the key point in grid control. This paper analyzed the station constraints and the system constraints seriously, and proposed the DC grid’s multi-point-voltage integrated control method with energy balance distribution. This method resolved the conflicts between station constraints and system constraints, in other words, this method can not only guarantee the nodes’ independence but also guarantee the control variables’ relevance. A five-terminal DC grid was modeled and built in PSCAD to verify the correctness and effectiveness of the multi-point-voltage control method, in the model, normal operation and N–1 fault were considered. The conclusions drawn in this paper can provide theory foundations for the future DC grids’ multi-point-voltage control.更多还原