直流配电系统不同运行模式下扁平化管理与协调控制策略研究

Research on Power Flat Management and Coordinated Control Strategy Under Different Operation Modes for DC Distribution System

构建高效、低耗、可靠的直流配电系统是实现直流型源、荷灵活接入和高效匹配的重要途径,相比较交流配电网拥有更大的发展潜力。首先对直流配电的系统组成、电压等级选取原则、拓扑结构进行了阐述。其次,针对多电压等级多换流器并网两端直流配电系统,在梳理系统不同运行模式下,基于一种电压信息编码的方法对系统中不同换流器进行扁平化管理与协调控制,以满足直流系统快速响应控制的需求。最后,通过建立不同换流器下系统小信号模型对关键参数进行整定,以保证多换流器在特定工作点下小扰动稳定。基于PSCAD/EMTDC建立系统仿真模型对所提出的策略进行了验证。

The construction of an efficient,low consumption,reliable DC distribution system is an important way to achieve flexible access and efficient matching of DC power and DC load,which has greater development potential compared with AC distribution system.This paper described the system composition,voltage level selection principle and topology structure of DC power distribution at first.Secondly,this paper proposed a flat and easy-to-expand power management and coordinated control method under different operation modes for muti-power converters based on voltage information coding,which can meet the needs of DC system fast response control.Finally,key parameters were set by establishing a system small signal stability model to ensure system stable in small disturbance.The simulation results verify the effectiveness of the proposed power management and control strategy.