摘要
对于风电场的接入柔性直流输电具有明显的技术经济优势,而大规模风电的集中接入需要更强的鲁棒性。基于换流器三相坐标系下的数学模型,建立了换流器在d-q旋转坐标系下的EL(Euler-Lagrange)数学模型,证明了换流器的严格无源性。基于换流器的能量耗散性,采用状态误差构造能量存储函数并以误差存储函数为Lyapunov函数,通过注入阻尼使系统快速收敛到期望稳定平衡点。根据误差存储函数的收敛条件设计了换流器的无源控制器,实现了各变量的解耦控制。在不同的运行条件下,用PSCAD/EMTDC软件对控制系统进行了仿真,结果表明所提出的控制策略具有良好的动、静态性能和鲁棒性。
For wind farm connection VSC-HVDC transmission has obvious techno-economic advantages, but concentrated integration of large scale wind power demands stronger robustness. Based on the mathematical model of VSC-HVDC in three phase frame, the Euler-Lagrange model of voltage-source-converter （VSC） in rotating d-q frame is built and the strict passivity of VSC is proved. Based on the energy dissipativity of VSC, energy storage function is set up by state error and error storage function is used as Lyapunov function, VSC-HVDC is astringed to desired stable equilibrium point rapidly by damping assigning. The passivity controler is designed according to the astringency condition of error storage function, and decoupling control of each variable is achieved. Under different operating conditions, VSC-HVDC system is simulated by software PSCAD/EMTDC. The results show the proposed control strategy has good dynamic and steady performance and strong robustness.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第10期311-319,共9页
Transactions of China Electrotechnical Society
基金
国家高技术研究发展计划(863计划)资助项目(2011AA05A102)
