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Grid Inductance Estimation by Reactive Power Perturbation for Sensor-less Scheme Based on Virtual Flux
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| Author(s) |
Arkadiusz Kulka, Tore Undeland |
| Abstract |
Use of renewable energy sources is raising for grid connected systems, for which higher power quality requirements are being issued. Monitoring the grid impedance ensure stable operation of the controller and proper connection
and disconnection from the grid. Thus it is vital to know the value of grid or transformer distributed impedance in given time, instead assuming a constant value in controller. To overcome this problem an identification method based on perturbation of reactive power is proposed. The normally inductive character of the grid used together with synchronous frame current controller have cross coupling terms which are
used in analysis. This method is suitable for use with virtual flux oriented control. It uses two current sensors and one dc
link voltage sensor. Method enables maintain unity power factor not only at PCC but also further into the grid, including lines and transformer leakage inductance. |
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| Filename: | Unnamed file |
| Filesize: | 881.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2008-09-30 by System |
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