采用下垂控制的直流配电网小干扰稳定性分析  

Small-signal Stability Analysis of DC Distribution Network Adopting Droop Control

作　　者：金阳忻 徐习东[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电力系统自动化》2016年第14期78-85,共8页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2015AA050104)~~

摘　　要：下垂控制是直流配电网的一种重要控制方式。推导了计及换流器时间常数的电压源型换流站本地控制数学模型及其线性化的小干扰分析模型。结合站间协调控制,分析了下垂控制的通用小干扰分析模型及两种典型情况。依据换流站小干扰分析模型,设计了小干扰等效阻抗模型,可将多端直流配电网逐端简化为单端换流站与若干小干扰等效阻抗组成的系统。最后利用根轨迹方法定量讨论了两种下垂控制方式的小干扰稳定性及其影响因素,并通过PSCAD/EMTDC数字仿真软件进行了验证。Droop control is an important DC distribution network control mode.A voltage source converter（VSC）substation local control mathematical model and its linearized small-signal analysis model are deduced.Furthermore,by referring to coordinated control,ageneral small-signal analytic model of droop control strategies,along with its two typical situations,is analyzed.Based on the VSC small-signal analysis model,the linearized equivalent impedance is devised,by which the whole DC distribution network can be simplified to a system comprising one VSC and several linearized equivalent impedances one by one.Finally the root locus method is adopted to discuss the small-signal stability and its factors of two droop control modes quantitatively,whose validity is verified with PSCAD/EMTDC digital simulation software.

关 键 词：直流配电网 下垂控制 小干扰稳定性分析 小干扰等效阻抗 根轨迹法 

分 类 号：TM721.1[电气工程—电力系统及自动化]