Operation of Distributed Generation in Weak Grids with Local Critical Load

The integration of distributed generation (DG) in weak grids can help the utility in providing reliable power to critical and sensitive loads. That requires the modification of the DG controller to be able to continuously supply power to the loads that are connected at the same bus. In this paper, an algorithm has been developed to ensure the continuous and proper operation of a DG either in case of grid power existence or grid outage. In normal operation, the DG is capable of supplying power into the grid and maintaining the nominal voltage. Moreover, the DG controller, in case of grid failure, is capable of maintaining the nominal values of both the voltage and the frequency. The transients due to the transition between the two modes are discussed

[1]  H. Awad,et al.  Voltage Compensation in Weak Grids Using Distributed Generation with Voltage Source Converter as a Front End , 2005, 2005 International Conference on Power Electronics and Drives Systems.

[2]  Jin-Woo Jung,et al.  Power Flow Control of a Single Distributed Generation Unit , 2008, IEEE Transactions on Power Electronics.

[3]  S.-K. Chung,et al.  Phase-locked loop for grid-connected three-phase power conversion systems , 2000 .

[4]  F.A. Magueed,et al.  Transient performance of voltage source converter connected to grid through LCL-filter under unbalanced voltage conditions , 2005, 2005 IEEE Russia Power Tech.

[5]  G. Joos,et al.  The potential of distributed generation to provide ancillary services , 2000, 2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134).

[6]  J.-W. Jung,et al.  Power flow control of a single distributed generation unit with nonlinear local load , 2004, IEEE PES Power Systems Conference and Exposition, 2004..

[7]  A. Y. Chikhani,et al.  Intention islanding of distributed generation for reliability enhancement , 2003, CIGRE/IEEE PES International Symposium Quality and Security of Electric Power Delivery Systems, 2003. CIGRE/PES 2003..

[8]  E.F. El-Saadany,et al.  Flexible distributed generation: (FDG) , 2002, IEEE Power Engineering Society Summer Meeting,.

[9]  V. John,et al.  Investigation of anti-islanding protection of power converter based distributed generators using frequency domain analysis , 2004, IEEE Transactions on Power Electronics.

[10]  E.F. El-Saadany,et al.  Intentional islanding of distributed generation , 2005, IEEE Power Engineering Society General Meeting, 2005.

[11]  F. Blaabjerg,et al.  Flexible control of small wind turbines with grid failure detection operating in stand-alone and grid-connected mode , 2004, IEEE Transactions on Power Electronics.