Analysis of a Microturbine Generator System Connected to a Distribution System Through Power-Electronics Converters

This paper presents the analyzed results of a permanent-magnet synchronous generator-based microturbine generator (MTG) system connected to a distribution system through an AC-to-DC converter and a DC-to-AC inverter. The employed mathematical model based on a dq-axis reference frame is derived to establish the complete dynamic equations of the studied MTG system for simulating the characteristics of the MTG under various operating conditions. A damping controller is designed for the DC-to-AC inverter using modal control theory to render adequate damping characteristics to the studied MTG under various disturbance conditions. Steady-state performance and dynamic simulations of the studied MTG under different operating conditions and various disturbance conditions are carried out, respectively. It can be concluded from the simulation results that the designed damping controller of the DC-to-AC inverter can provide adequate and effective damping characteristics to the studied grid-connected MTG system under disturbance conditions.

[1]  K. Al-Haddad,et al.  Modeling and simulation of the electric part of a grid connected microturbine , 2004, IEEE Power Engineering Society General Meeting, 2004..

[2]  A. Feliachi,et al.  Dynamic model of a microturbine used as a distributed generator , 2002, Proceedings of the Thirty-Fourth Southeastern Symposium on System Theory (Cat. No.02EX540).

[3]  H. Nikkhajoei,et al.  A matrix converter based micro-turbine distributed generation system , 2005, IEEE Transactions on Power Delivery.

[4]  Li Wang,et al.  Suppression of common torsional mode interactions using shunt reactor controllers , 1993 .

[5]  H.-J. Nern,et al.  Modelling of the long term dynamic performance of a gas turbo generator set , 1994, 1994 Proceedings of IEEE International Conference on Control and Applications.

[6]  A. Feliachi,et al.  Control of grid-connected split-shaft microturbine distributed generator , 2003, Proceedings of the 35th Southeastern Symposium on System Theory, 2003..

[7]  Zhihong Ye,et al.  Efficiency comparison for microturbine power conditioning systems , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..