Local Reactive Power Control Methods for Overvoltage Prevention of Distributed Solar Inverters in Low-Voltage Grids

被引:355
作者
Demirok, Erhan [1 ]
Casado Gonzalez, Pablo [2 ]
Frederiksen, Kenn H. B. [3 ]
Sera, Dezso [1 ]
Rodriguez, Pedro [2 ]
Teodorescu, Remus [1 ]
机构
[1] Aalborg Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark
[2] Tech Univ Catalonia, Barcelona 08034, Spain
[3] EnergiMidt AS, Renewable Energy Dept, DK-8600 Silkeborg, Denmark
来源
IEEE JOURNAL OF PHOTOVOLTAICS | 2011年 / 1卷 / 02期
关键词
Low-voltage (LV) network; reactive power control; solar inverters;
D O I
10.1109/JPHOTOV.2011.2174821
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The main objective of this study is to increase the penetration level of photovoltaic (PV) power production in low-voltage (LV) grids by means of solar inverters with reactive power control capability. This paper underlines weak points of standard reactive power strategies which are already imposed by certain grid codes, and then, the study introduces a new reactive power control method that is based on sensitivity analysis. The sensitivity analysis shows that the same amount of reactive power becomes more effective for grid voltage support if the solar inverter is located at the end of a feeder. Based on this fundamental knowledge, a location-dependent power factor set value can be assigned to each inverter, and the grid voltage support can be achieved with less total reactive power consumption. In order to prevent unnecessary reactive power absorption from the grid during admissible voltage range or to increase reactive power contribution from the inverters that are closest to the transformer during grid overvoltage condition, the proposed method combines two droop functions that are inherited from the standard cos phi(P) and Q(U) strategies. Its performance comparison in terms of grid losses and voltage variation with different reactive power strategies is provided by modeling and simulating a real suburban LV network.
引用
收藏
页码:174 / 182
页数:9
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