US 7,321,834 B2 | ||
Method for calculating power flow solution of a power transmission network that includes interline power flow controller (IPFC) | ||
Chia-Chi Chu, Kwei-Shan (Taiwan); Sheng-Huei Lee, Kwei-Shan (Taiwan); and Hung-Chi Tsai, Kwei-Shan (Taiwan) | ||
Assigned to Chang Gung University, Kwei-Shan (Taiwan) | ||
Filed on Jul. 15, 2005, as Appl. No. 11/183,051. | ||
Prior Publication US 2007/0027642 A1, Feb. 01, 2007 | ||
Int. Cl. H02J 3/04 (2006.01) |
U.S. Cl. 702—60 [702/179; 702/188; 702/117; 307/102; 307/98; 307/99; 700/287; 700/293; 700/297; 700/291; 323/207; 323/282; 363/81] | 8 Claims |
1. A method for calculating power flow solution of a power transmission network that includes the interline power flow controllers
(IPFCs), said IPFC having a plurality of voltage source converters (VSCs), wherein the DC sides of said VSCs are linked together
to a DC coupling capacitor and the AC sides are linked to the transmission lines of said power transmission network through
coupling transformers; said VSCs being modeled by a plurality of series branches, each series branch comprising a voltage
source in series with an impedance; the first series branch being able to adjust the active or reactive power of a transmission
line of said power transmission network; each of the remaining series branches being able to adjust simultaneously the active
and reactive power of a transmission line of said power transmission network; said power flow solution including the voltage
at each bus of said power transmission network and the equivalent voltages of the VSCs; said method comprising:
A) calculating an original mismatch vector without considering the IPFC;
B) establishing a Jacobian matrix corresponding to the original mismatch vector in A);
C) obtaining d-q components of a receiving-end bus voltage of the IPFC by a d-q axis decomposition;
D) calculating equivalent active and reactive loading at sending-end and receiving-end buses of a first branch of the IPFC;
E) calculating equivalent active and reactive loading at sending-end and receiving-end buses of remaining series branches;
F) calculating active power flowing from a DC coupling capacitor;
G) modifying the original mismatch vector and the Jacobian matrix;
H) updating an unknown vector by an iteration formula;
I) judging convergence of the power flow solution; if the solution converges within a specified tolerance, going to J); otherwise,
going to A);
J) calculating the equivalent voltage of a converter; and
k) using the result in J in setting up a steady state model of IPFC.
|