A global asymptotical stable control scheme for a Hexverter in fractional frequency transmission systems

• 作者: Huixuan LI Jianyang YU Xifan WANG Yichao ZOU Yongqing MENG
• 来源期刊: 现代电力系统与清洁能源学报(英文)
• 学科: 工学
• 关键词: Fractional frequency transmission system(FFTS) Hexverter Port-controlled Hamiltonian(PCH)system INTERCONNECTION and damping assignment passivity-based control(IDA-PBC)
• 年，卷（期）: 2019,（6）
• 页码范围: 1495-1506
• 页数: 12页
• 分类号: TM46

摘要

A fractional frequency transmission system(FFTS)is the most competitive choice for long distance transmission of offshore wind power,while the Hexverter,as a newly proposed direct AC/AC converter,is an attractive choice for its power conversion.This paper proposes a novel control scheme characterizing the global stability and strong robustness of the Hexverter in FFTS applications,which are based on the interconnection and damping assignment passivity-based control(IDA-PBC)methodology.Firstly,the frequency decoupled model of the Hexverter is studied and then a port-controlled Hamiltonian(PCH)model is built.On this basis,the IDAPBC scheme of the Hexverter is designed.Considering the interference of system parameters and unmodeled dynamics,integrators are added to the IDA-PB controller to eliminate the steady-state error.In addition,the voltagebalancing control is applied in order to balance the capacitor DC voltages to obtain a better performance.Finally,the simulation results and experimental results are presented to verify the effectiveness and superiority of the IDA-PB controller.