Title :
Coherency and aggregation techniques incorporating rotor and voltage dynamics
Author :
Joo, Sung-Kwan ; Liu, Chen-Ching ; Jones, Lawrence E. ; Choe, Jong-Woong
Author_Institution :
Dept. of Electr. Eng., Univ. of Washington, Seattle, WA, USA
fDate :
5/1/2004 12:00:00 AM
Abstract :
Dynamic equivalents have been widely used to reduce computational efforts when a large number of scenarios have to be studied to evaluate the stability of interconnected power systems. Most coherency methods developed for model reduction do not consider the effect of voltage variations on the coherency of generators due to weak coupling between real power and voltage. In reality, however, the coherency of generators can be influenced by voltage related factors such as location and speed of AVR controls, generator terminal voltage variation, and load bus voltage variation. The reduced dynamic equivalent is not accurate if the voltage characteristics of the original system are not included in the model. This paper presents coherency identification techniques incorporating rotor and voltage dynamics in order to improve the accuracy of dynamic equivalents. This paper also presents a new method to match the power flow conditions for generator aggregation. This new technique is shown to be critical for the accuracy of aggregated dynamic models. Numerical results based on the model of an actual power system in Asia are presented to demonstrate the performance of the proposed method.
Keywords :
aggregation; load flow; power system dynamic stability; power system identification; power system interconnection; rotors; aggregation techniques; coherency identification techniques; computational efforts reduction; generators coherency; interconnected power system; power flow; power system dynamics; rotor dynamics; stability evaluation; voltage dynamics; voltage variations; Asia; Load flow; Power generation; Power system dynamics; Power system interconnection; Power system modeling; Power system stability; Reduced order systems; Rotors; Voltage control;
Journal_Title :
Power Systems, IEEE Transactions on
DOI :
10.1109/TPWRS.2004.825825