摘要
多端柔性直流输电系统(voltage source converter based multi-terminal direct current system,VSC-MTDC)是在两端直流输电基础上发展而来的直流输电系统,可靠性高、适用于海上风电并网等场景,相应的控制策略更加多样,其潮流模型也更加复杂。该文分析VSC换流站和MTDC的稳态模型,研究可适用于VSC-MTDC的不同拓扑和连接方式的潮流模型;研究多端直流各种控制策略潮流计算模型的不同点并推导出其方程。在此基础上,提出一种兼具统一迭代法和交替迭代法优点的含VSC-MTDC交直流系统潮流算法,给出初值和边界条件求解方法,对于不同直流拓扑和交流系统都能够进行求解。最后通过2个实际算例验证该文潮流模型的有效性和收敛性,对于不同控制方式、不同运行场景和直流拓扑都能够迅速、稳定收敛。
Voltage source converter based multi-terminal direct current system(VSC-MTDC),which develops from two-terminal DC transmission system,has a high reliability and is appropriate for offshore wind power grid connection.The control strategies of VSC-MTDC are multifarious and corresponding power flow models are more complicated.This paper studied the steady-state model of VSC station and MTDC and deduces the power flow model of MTDC which is appropriate for different DC topologies and connection types.Then control strategies of VSC-MTDC and their differences of power models were analyzed.On this basis,an AC/DC power flow algorithm with VSC-MTDC was proposed,which contains the advantages of the unified iterative method and alternating iterative method and can be applied to different DC topologies and AC systems.In addition,the calculation method of initial values and boundary conditions were given in this paper.Finally,the validity and convergence of the algorithm were demonstrated in two practical cases.The results indicate that the algorithm can converge steadily and rapidly under different control modes,scenes and DC topologies.
作者
周涛
陈中
戴中坚
孙可慧
刘艺
ZHOU Tao;CHEN Zhong;DAI Zhongjian;SUN Kehui;LIU Yi(School of Electrical Engineering,Southeast University,Nanjing 210096,Jiangsu Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2019年第11期3140-3149,共10页
Proceedings of the CSEE
基金
国家重点研发计划项目(2016YFB0900600)
国家电网公司科技项目(52094017000W)~~
