device for filtering and transient stability of the power voltage.

摘要

The installation is intended to the transitory stabilization of the voltage of alternating voltage networks and to the filtering of undesirable isolated harmonics and impulses of the set voltage curve. The main feature of said installation consists in directing under low impedance and without transformer the network voltage onto field effect transistors and low impedance direct voltage sources. The installation comprises essentially a circuit including an electronic power part (1) and an electronic control part (2) which are connected to the network (4). Two banks of capacitors (58, 59) are supplied by the network in parallel circuits containing n-channel-field effect transistors (60, 62) and an antiparallel arrangement. The transistors operate in cathode follower circuit and receive their grid voltage shifted by 180o through the transformer (64) of the signal generator (25) of which the sinusoidal output signal is synchronized with the network by the member (26). A feedback regulating circuit (27, 28, 29, 30, 31) compares the sinusoidal signal with the basic oscillation of the network voltage and equalizes the signal magnitude with a delay determined by the low-pass circuit (31). The operation threshold of the transistors (60, 62) is regulated by the potentiometer (69, 70) by taking into account the characteristic curve of the transistors. The installation is preferably used in low networks having large consumer apparatuses which are often switched on, strong pertubation sources and sensitive apparatuses connected in parallel.