Mitigation of harmonic currents and conservation of power in...

H - Electricity – 02 – P

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H02P 27/00 (2006.01) G05F 1/70 (2006.01) H02P 25/02 (2006.01)

Patent

CA 2650801

An AC power controller system (56) applies three-phase AC operating voltage to an induction motor (38) that drives a non-linear mechanical load (40). A primary low pass filter (54) is connected in series between branch phase conductors (28, 30, 32) and a power controller (36) that controls the application of AC power to the motor. KVAR rated capacitors (C4, C5, C6) connected in shunt relation across the power controller output terminals (Ml, M2, M3) and the induction motor phase windings (W1, W2, W3) form a secondary low pass filter (59) across the controller output terminals. The primary low pass filter and secondary low pass filter isolate the power controller and induction motor with respect to spurious noise and harmonics generated by local as well as remote sources, and also improve real power transfer efficiency from the power generating source (12) to the induction motor (38).

Selon l'invention, un système de contrôleur de puissance alternative (56) applique une tension de fonctionnement triphasée alternative à un moteur à induction (38) qui entraîne une charge mécanique non linéaire (40). Un filtre passe-bas primaire (54) est relié en série entre des conducteurs de phases de branchement (28, 30, 32) et un contrôleur de puissance (36) qui commande l'application de la puissance alternative au moteur. Des condensateurs dimensionnés pour des KVAR (C4, C5, C6) sont reliés en dérivation sur les bornes de sortie (M1, M2, M3) du contrôleur de puissance, et les enroulements des phases (W1, W2, W3) du moteur à induction forment un filtre passe-bas secondaire (59) sur les bornes de sortie du contrôleur. Le filtre passe-bas primaire et le filtre passe-bas secondaire isolent le contrôleur de puissance et le moteur à induction par rapport à un bruit parasite et à des harmoniques générés par des sources locales aussi bien que distantes, et ils améliorent également le rendement réel de transfert de puissance depuis la source de génération de puissance (12) vers le moteur à induction (38).

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