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直流的分层接入方式将特高压直流输电线路接入不同电压等级电网,作为一种新的网络结构,其控制系统需要重新设计.本文结合传统的特高压直流输电控制系统详细分析了分层接入方式下特高压直流系统的控制系统,并介绍了工程中广泛使用的两种技术路线,据此设计了两种不同的特高压直流输电分层接入方式下的控制系统.基于PSCAD＼EMTDC的仿真平台,本文针对两种控制系统建立了详细的仿真模型,并分析了控制系统之间的差异.研究发现分层接入方式下逆变侧的控制系统较常规特高压直流输电控制系统有一定差异,本文设计的控制系统均可以满足分层接入的方式下,直流输电控制系统对于控制的要求.“,”As a new type of power grid mode,hierarchical connection mode makes UHVDC (Ultra High Voltage Direct Current) links connect to different voltage-level AC power system,and its control system is needed to be redegined.Combining with the control system in traditional UHVDC system,the control system of UHVDC in the forms of hierarchical connection is analyzed,two kinds of technical ways are introduced,and two different control system of UHVDC with hierarchical connection are designed.Based on PSCAD EMTDC simulation platform,detail simulation model is built as to two kinds of control systems,and the differences between control systems are analyzed.The results show that the control system at the inverter side under hierarchical connection mode is greatly different to traditional UHVDC control system.The control system designed in this paper can meet the controlling requirement of UHVDC system under hierarchical connection mode.