where [L.sub.f] and [R.sub.f] are the leakage inductance
and the copper losses of the transformer, respectively, [C.sub.f] is the output capacitor and [[omega].sub.1] is the angular speed of the SRF ([[omega].sub.1] = 100[pi] rad/s); [v.sub.cd] and [v.sub.cq] are the d and q components of the capacitor voltage, which are the variables to be controlled, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] are the current components through the leakage inductance
, [i.sub.sd] and [i.sub.sq] stand for the current of the load, and [u.sub.d] and [u.sub.q] are the VSC output voltage components.
spatial modulation of rotor leakage inductance
caused by the grooves in the rotor.
[L.sub.s] represents the parameter of stator leakage inductance
, [L.sub.r] represents the parameter of rotor leakage inductance
, and [L.sub.m] represents the parameter of mutual inductance.
As it is known, elaborating of the induction drive model requires values of rotor resistance, its leakage inductance
and mutual inductance of stator and rotor windings.
--[L.sub.lks]: leakage inductance
at transformer secondary side.
1 is the following: R1--primary winding serial resistance, L1--primary leakage inductance
, L2--primary magnetizing inductance, R3--secondary winding serial resistance, L3--secondary leakage inductance
, L4--secondary magnetizing inductance, C1--inter-windings capacitance, R2--isolation resistance between windings, K1--(K_linear) linear magnetic coupling between L2 and L4.
[L.sub.m] is magnetizing inductance, [L.sub.s] = [L.sub.1s] + [L.sub.m] is stator inductance, [L.sub.1s] is stator leakage inductance
; [L.sub.r] = [L.sub.1r] + [L.sub.m], [L.sub.1r] is rotor leakage inductance
referred to stator and [k.sub.1] = [L.sub.m] / [L.sub.s].
It consists of lumped parameters of primary winding (resistance of primary winding [R.sub.1], leakage inductance
of primary winding [L.sub.1]), secondary winding (resistance [R.sub.2], leakage inductance
[L.sub.2]) connected with burden equivalent resistance [R.sub.b].
where [L.sub.22] = [L.sub.11] = [L.sub.B] + [L.sub.m], [L.sub.m] = [L.sub.21] = [L.sub.12] = [i.sub.b1] + [i.sub.cir] and [i.sub.b5] = -[i.sub.b1] + [i.sub.cir], and where [i.sub.x] (x = a, b, c) is the line current, Lb is the leakage inductance
of the inductor windings, which is expected to be identical for all windings, and [L.sub.m] is the magnetizing inductance of the coupled inductor.
To keep the overall efficiency high, leakage inductance
must be kept to a minimum as it is a source of energy waste.
) reiUkiniai, kurie maPina tokio tipo transformatoriaus efektyvuma ir didPiausiaja darbine galia.