Modeling microgrids with active loads

It is known that active rectifier loads present a negative incremental resistance and have control loop dynamics similar to inverters that may supply a microgrid. To investigate this, a small-signal model of an active rectifier load within a microgrid is developed. The active rectifier load and microgrid are modeled in the synchronous (DQ) reference frame. A participation analysis of the model is performed and modes of the system are identified. The model is verified in a laboratory using rapid prototyping power converters where a set of load perturbations are performed to identify the modes predicted by the participation analysis.

[1]  F. Fuchs,et al.  PWM rectifier with LCL-filter using different current control structures , 2007, 2007 European Conference on Power Electronics and Applications.

[2]  Josep Bordonau,et al.  A novel control approach of three-level VSIs using a LQR-based gain-scheduling technique , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[3]  Chun-Taek Rim,et al.  Transformers as equivalent circuits for switches: general proofs and D-Q transformation-based analyses , 1990 .

[4]  Ali Emadi,et al.  Modeling of power electronic loads in AC distribution systems using the generalized State-space averaging method , 2004, IEEE Transactions on Industrial Electronics.

[5]  Bong-Hwan Kwon,et al.  A line-voltage-sensorless synchronous rectifier , 1999 .

[6]  V. Blasko,et al.  A novel control to actively damp resonance in input LC filter of a three-phase voltage source converter , 1997 .

[7]  M.R. Iravani,et al.  Power Management Strategies for a Microgrid With Multiple Distributed Generation Units , 2006, IEEE Transactions on Power Systems.

[8]  Maurice H. Kent,et al.  Dynamic Modeling of Loads in Stability Studies , 1969 .

[9]  M. Liserre,et al.  Design and control of an LCL-filter based three-phase active rectifier , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[10]  P. Kundur,et al.  Power system stability and control , 1994 .

[11]  Ali Emadi.  Modelling of power electronic loads in AC distribution systems using the generalized state space averaging method , 2001, IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243).

[12]  Robert H. Lasseter,et al.  Microgrids And Distributed Generation , 2007, Intell. Autom. Soft Comput..

[13]  F. Verhulst,et al.  Averaging Methods in Nonlinear Dynamical Systems , 1985 .

[14]  K. Siri,et al.  Simulation of large distributed DC power systems using averaged modelling techniques and the Saber simulator , 1994, Proceedings of 1994 IEEE Applied Power Electronics Conference and Exposition - ASPEC'94.

[15]  T.C. Green,et al.  Modeling, Analysis and Testing of Autonomous Operation of an Inverter-Based Microgrid , 2007, IEEE Transactions on Power Electronics.