Improvement of power system stability using static voltage stabilizer

Design procedure of firing angles for harmonic reduction in a thyristor-controlled reactor by asymmetrical firing control

“…Active investigations have been carried out concerning its Paper 3946C (PI, P6), received 6th February 1985 The authors are with the Department of Electrical Engineering, School of Engineering, Okayama University, 3-1-1 Tsushima-naka, Okayama, 700 Japan applications to VAR compensators and voltage regulators at busbars [2,3]. The validity of systems equipped for such uses has been reported [4].…”

“…List of principal symbols e = instantaneous value of AC source voltage i 5 i l5 i 2 = instantaneous values of line current, and currents of two branches in AFC-type TCR, respectively = inductance of reactor = reactance of reactor 5 P Q,Qu •" n ' * un L X Thl, Th2, Th\ ThA = thyristors of AFC-type TCR a = firing angle of thyristor a A , a B = firing angles of thyristor in AFC-type TCR 0 ^ <x A ^ a B ^ n = extinction angle of thyristor = reactive powers in AFC-type and UMconcept-type TCRs, respectively = maximum reactive power controlled in TCRs = harmonic currents in AFC-type and UMconcept-type TCRs, respectively = maximum value of fundamental component of line current P nk = peak points in each harmonic distribution (n = the order of harmonics and k = the sequence of peak points) r/i3> ^Th*-t n e current carrying capacities of the thyristors I Thn = current carrying capacity of a thyristor in a conventional TCR = reactive-power capability of the reactor = reactive-power capability of a reactor in a conventional TCR = the number of multiplexing units A thyristor-controlled reactor (TCR) [1] has the advantage of a fast response and continuous control of current. Active investigations have been carried out concerning its Paper 3946C (PI, P6), received 6th February 1985 The authors are with the Department of Electrical Engineering, School of Engineering, Okayama University, 3-1-1 Tsushima-naka, Okayama, 700 Japan applications to VAR compensators and voltage regulators at busbars [2,3].…”