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Fixed-Reference-Frame-Control: A novel robust control concept for grid side inverters in HVDC connected weak offshore grids
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| Author(s) |
Hans-Joachim KNAAK, Magdalena GIERSCHNER, Hans-Günter ECKEL |
| Abstract |
Offshore wind energy plants built at a long distance from public ac-grid are connected by HVDC-transmission. Hence an offshore ac-island-grid results, in which the HVDC station generates the grid while the inverters of the wind power plants synchronize themselves on that gird. As the power of the HVDC-station is not significant higher than that of the sum of all wind power plants, the grid is relative weak. This could lead to stability problems of wind power plants grid side converters.
In this paper, this stability problem is analyzed and a theoretic stability limit of the PLL is given. The critical parameter for stability is the internal impedance of the grid.
Also a novel control concept to solve the stability problems is presented in this paper. The basic idea is, that all converters in the grid are synchronized on an external signal the fixed reference frame and that the HVDC converter acts as a voltage source and the wind power plant inverters as current sources.
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| Filename: | 0047-epe2014-full-21330614.pdf |
| Filesize: | 250.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2015-06-08 by System |
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