DOI:https://doi.org/10.1007/s40565-019-0549-y |
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A global asymptotical stable control scheme for a Hexverter in fractional frequency transmission systems |
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Net amount: 546 |
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Author:
Yongqing MENG1, Yichao ZOU1 , Huixuan LI2, Jianyang YU1, Xifan WANG1
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Author Affiliation:
1 School of Electrical Engineering, Xi’an Jiaotong University, Xi’an, China 2 State Grid Henan Electric Power Company Economic Research Institute, Zhengzhou, China
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Foundation: |
This work was supported by National Natural Science Foundation of China (No. 51677142) and Science andTechnology Foundation of SGCC (Research on efficient integration of large scale long distance offshore wind farm and its key technologies in operation and control). |
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Abstract: |
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 IDAPB control 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. |
Keywords: |
Fractional frequency transmission system (FFTS), Hexverter, Port-controlled Hamiltonian (PCH) system, Interconnection and damping assignment passivity-based control (IDA-PBC) |
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Online Time:2019/11/27 |
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