A study on stability enhancement of distributed generators

Large number of 400 V distributed generators (DGs) connected to existing electric systems may have a great impact on their dynamic behaviour when external disturbances occur, such as a three-phase short circuit fault. This paper presents an investigation about the transient stability and the capacity of DG to withstand disturbances in the distribution network. Three proposed solutions to avoid the loss of generation are presented. The RTDS (real time digital simulator) platform is used for analysis of system performance.

[1]  E. Muljadi,et al.  Wind Farm Power System Model Development , 2004 .

[2]  C. J. Mozina.  Interconnect protection of dispersed generators , 2001, 2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294).

[3]  Ronnie Belmans,et al.  The influence of the connection technology of dispersed energy sources on grid stability , 2004 .

[4]  S. K. Salman,et al.  Investigation into the estimation of the critical clearing time of a grid connected wind power based embedded generator , 2002, IEEE/PES Transmission and Distribution Conference and Exhibition.

[5]  W.G. Hartmann.  How not to nuisance-trip distributed generation , 2005, IEEE Systems Technical Conference on Industrial and Commercial Power 2005..

[6]  Wilsun Xu,et al.  Comparative analysis between ROCOF and vector surge relays for distributed generation applications , 2005, IEEE Transactions on Power Delivery.

[7]  G. Dalke,et al.  Grounding and ground fault protection of multiple generator installations on medium-voltage industrial and commercial systems-Part 2: Grounding Methods Working Group report , 2004, IEEE Transactions on Industry Applications.

[8]  E.R. Collins.  Torque and slip behavior of single-phase induction motors driven from variable frequency supplies , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[9]  E. Acha,et al.  Modeling and Analysis of Custom Power Systems by PSCAD/EMTDC , 2001, IEEE Power Engineering Review.