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1.天津大学电气自动化与信息工程学院,天津市 300072
2.国网河北省电力有限公司电力科学研究院,河北省石家庄市 050021
3.国网北京市电力公司,北京市 100031
Received:30 July 2021,
Revised:2021-12-27,
Published Online:18 May 2022,
Published:10 January 2023
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朱介北,李峰,俞露杰等.基于周期搜索的多端柔性直流输电系统非线性下垂控制[J].电力系统自动化,2023,47(1):143-152.
ZHU Jiebei,LI Feng,YU Lujie,et al.Periodical Searching Based Nonlinear Droop Control for Multi-terminal Flexible DC Transmission System[J].Automation of Electric Power Systems,2023,47(1):143-152.
朱介北,李峰,俞露杰等.基于周期搜索的多端柔性直流输电系统非线性下垂控制[J].电力系统自动化,2023,47(1):143-152. DOI: 10.7500/AEPS20210730004.
ZHU Jiebei,LI Feng,YU Lujie,et al.Periodical Searching Based Nonlinear Droop Control for Multi-terminal Flexible DC Transmission System[J].Automation of Electric Power Systems,2023,47(1):143-152. DOI: 10.7500/AEPS20210730004.
当基于电压源换流器的多端柔性直流输电系统采用有功功率-直流电压线性下垂控制策略时,直流网络特性会影响换流站功率分配的准确性。在直流输电网络拓扑未知的情况下,通过建立换流站通用的有功功率-直流电压数学模型,分析了直流网络特性影响下的换流站有功功率-直流电压下垂特性的非线性特征。基于此,提出一种基于周期搜索的多端柔性直流输电系统非线性下垂控制策略,可在直流输电网络拓扑及参数未知的前提下,利用搜索技术实时获取换流站在可能运行范围内的精确非线性下垂特性曲线,再将该曲线周期性地更新到换流站底层控制中,最终实现多端柔性直流输电系统换流站有功功率的精确控制。通过在MATLAB/Simulink中建立四端环网直流输电系统模型,不仅对换流站有功功率-直流电压下垂特性的非线性分析结论进行了验证,还与传统线性下垂控制进行对比,验证所提控制策略还原换流站非线性下垂特性的准确性以及换流站有功功率精准控制的优越性。
When the voltage source converter based multi-terminal high voltage direct current (VSC-MTDC) system adopts the linear droop control strategy of active power and DC voltage
the accuracy of the power-sharing among converter stations will be affected by the DC network characteristics. In the scenario that the DC network topology is unknown
a generalized mathematical model between the active power and the DC voltage of the converter station is established. Under the influence of DC network characteristics
the nonlinear feature of active power and DC voltage droop characteristic of the converter station is analyzed. On this basis
a periodical searching based nonlinear droop control strategy for the VSC-MTDC system is proposed
in which the accurate droop characteristic curve of the converter station operating within the possible ranges can be obtained through the searching technique without the prior knowledge of DC network topology and its parameters. Then the accurate active power control of the converter station can be ultimately implemented after the obtained accurate droop characteristic curve is updated to the bottom controller of the converter station. By establishing a four-terminal VSC-MTDC system model with a ring network in MATLAB/Simulink
not only the analysis conclusion of the nonlinear feature for the active power and DC voltage droop characteristics of the converter station is verified
but also the accuracy of the proposed control strategy in restoring nonlinear droop characteristics of converter station as well as power control compared with the traditional linear droop control strategy is demonstrated.
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