Title :
Undervoltage load shedding using global voltage collapse index
Author :
Klaric, M. ; Kuzle, I. ; Tesnjak, S.
Author_Institution :
Power Syst. Dept., Fac. of Electr. Eng., Zagreb, Croatia
Abstract :
Increasingly higher demand in power created problems in power system operation since the growth of the transmission system is restricted. System often function close to their stability limits and sometimes loads need to be shed in order to prevent system from collapsing. In this paper one undervoltage load shedding (UVLS) method to prevent voltage collapse is presented. This method is based on a global index, which indicates voltage collapse proximity and voltage magnitudes on critical buses. Global index for voltage collapse proximity determination is calculated based on power flow Jacobian matrix operations. Considering that on the voltage stability limit Jacobian matrix becomes singular, it cannot be inverted. Therefore method involving eigenvalue calculation is used here. IEEE 14 bus system was used as a numerical example, which showed how loads and system in general can be saved from voltage collapse using UVLS.
Keywords :
Jacobian matrices; eigenvalues and eigenfunctions; load flow; load shedding; power system dynamic stability; transmission networks; IEEE 14 bus system; critical buses; eigenvalue calculations; global voltage collapse index; matrix singularity; power flow Jacobian matrix; power system operation; transmission system stability; undervoltage load shedding; voltage collapse proximity; voltage magnitudes; voltage stability; Jacobian matrices; Load flow; Power system analysis computing; Power system measurements; Power system planning; Power system stability; Reactive power; Sparse matrices; Stability analysis; Voltage;
Conference_Titel :
Power Systems Conference and Exposition, 2004. IEEE PES
Print_ISBN :
0-7803-8718-X
DOI :
10.1109/PSCE.2004.1397491