Patent CZ-306490-B6 (CZ)
Title: A device for dynamic determination of the parameters of electrical asynchronous machines
Inventor: PAVELKA JIŘÍ
IPC: H02P23/14
Filed: 2015-11-30
Abstract: The device consists of the block (1) for modification of inputs, the block (2) for determining the internal stress, the block (3) for determining the active power, the block (4) for determining the equivalent resistance of the rotor, the block (5) for determining the currents of the rotor, the block (6) for determining the magnetizing current, the block (7) for determining the magnetizing inductance, and the block (8) for determining the rotor resistance, hereinafter the blocks (1, 2, 3, 4, 5, 6, 7, 8). The instantaneous value of the line-to-line stator voltage u.sub.sab.n. between phases a a b, the instantaneous value of the line-to-line stator voltage u.sub.sac.n. between phases a a c, the instantaneous value of the stator current i.sub.sa.n. of phase a, the instantaneous value of the stator current i.sub.sb.n. of phase b, the frequency f.sub.s.n. of the supply voltage, the velocity n.sub.m.n. of rotor rotation and the values of the four parameters of the asynchronous engine, i.e. the resistance R.sub.s.n. of one phase of the stator winding, the leakage inductance L.sub.as.n. of one phase of the stator winding, the leakage inductance L.sub.or.n. of one phase of the rotor winding L.sub.or.n. and the number of pole pairs p.sub.p.n. of the asynchronous engine are conducted into the block (1) and processed into the electrical angular velocity .omega..sub.s.n. of the supply voltage, electrical angular velocity .omega..sub.m.n. of rotor rotation, the stator voltage component U.sub.sd.n. in axis d, the stator voltage component U.sub.sq.n. in axis q, the stator current component I.sub.sd.n. in axis d in and the stator current component I.sub.sq.n. in axis q. These values are, in the block (2), processed to the internal stress component U.sub.ld.n. in axis d, the internal stress component U.sub.lq.n. in axis q and the absolute value of the internal stress U1. These output quantities and output quantities from the block (1) are processed in the block (3) to the instantaneous internal performance P1. The values of the output quantities from the blocks (1, 2, 3) are processed in the block (4) to the equivalent effective resistance R.sub.req.n. of the rotor. The output quantities from the blocks (1, 2, 4) are processed in the block (5) to the rotor current component I.sub.rd.n. in axis d and the rotor current component I.sub.rq.n. in axis q, which are together with the outputs from the block (1) processed in the block (6) to the magnetizing current component I.sub..mi.d.n. in axis d, the magnetizing current component I.sub..mi.q.n. in axis q and the absolute value of the magnetizing current I.sub..mi..n.. The values of the output quantities from the blocks (1, 2, 6) are processed in the block (7) to the magnetizing inductance L.sub..mi..n.. The values of the output quantities from the blocks (1, 4) are processed in the block (8) to the resistance value R.sub.r.n. of the rotor and the values of the output quantities from the blocks (7, 8) are the values of the output quantities of the entire device.