Electricity: single generator systems – Automatic control of generator or driving means – With line-drop compensation
Patent
1990-11-16
1993-03-16
Hickey, R. J.
Electricity: single generator systems
Automatic control of generator or driving means
With line-drop compensation
322 28, 322 58, H02P 930, H02J 716
Patent
active
051948001
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a power supply system including a battery, a three-phase generator, and a rectifier connected with the generator and whose voltage is limited by switching on and off the field current of the generator with a voltage regulator that determines the actual voltage of the voltage at the generator terminals and produces an average field current in the generator exciter field.
Conventional built-in regulators for three phase generators maintain constant the voltage at the terminals of the generator. However, the terminals of the battery are also decisive for the voltage of the power supply system. The voltage drop U.sub.R on the line may amount to up to 400 mV. If regulation to the battery voltage is to be effected, an additional line from the battery to the built-in regulator is required.
SUMMARY OF THE INVENTION
The object of the invention is achieved by providing means that approximately compensate the undesirable voltage drop at the generator terminals.
The object of the invention is a power supply system in which the additional line is not needed and the occurring direct voltage drop is determined by means of an "auxiliary variable" at the generator terminals and the actual value of the generator voltage is increased by the same amount at least in a zero approximation by the regulator.
On the one hand, the line from the generator to the battery comprises not only a direct current resistance, but also an alternating current resistance due to its inductance. Both are proportional to the length of the line. On the other hand, the rectified three phase current or alternating current, respectively, contains considerable alternating current components which are proportional to the flowing direct current. Since the battery constitutes a sufficient short circuit for the superposed alternating current component, the alternating voltage occurring at the terminals of the generator is proportional to the line length and to the flowing direct current.
The special advantage of the power supply system, according to the invention, consists in that this alternating voltage component is processed in a circuit and utilized for correcting the actual value predetermined by the voltage regulator.
The present invention both as to its construction so to its method of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of the preferred embodiment when read with reference to the accompanying drawings .
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a schematic view of a power supply system with three phase generator, rectifier, regulator, battery and the connection line with the corresponding variables according to the invention;
FIG. 2 shows a block wiring diagram of the evaluating circuit for correcting the actual value.
FIG. 3 shows a block wiring diagram of a regulator according to the invention; and
FIG. 4 shows a correcting element according to the invention and the voltage regulator including the correcting element.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows a generator 1 with exciting winding 2, rectifier 3 and voltage regulator 4. Its positive terminal is designated by 51, its negative terminal is designated by 52. The line 5 connects the generator with the battery 6, whose positive terminal and negative terminal are designated by 53 and 54, respectively. The direct voltage at the terminals 51, 52 of the generator is designated by U.sub.1 and the direct voltage at the terminals of the battery is designated by U.sub.2 ; in a corresponding manner, V.sub.1 and V.sub.2 designate the occurring alternating voltage components.
The line comprises a resistance load per unit length K.sub.R and an inductance per unit length K.sub.L. With line length 1, the direct current resistance R and inductance L result, respectively, in i is the alternating current component. Accordingly, given V.sub.2 =0, the voltage drops on the line 5 and only the amount of the alternating voltage with angu
REFERENCES:
patent: 3716774 (1973-02-01), Lace
patent: 4335344 (1982-06-01), Gant
patent: 4340849 (1982-07-01), Kuhn
Conzelmann Gerhard
Junger Andreas
Nagel Karl
Hickey R. J.
Robert & Bosch GmbH
Striker Michael J.
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