Prime-mover dynamo plants – Plural prime mover – Plural prime movers with fluid interconnection
Patent
1998-07-20
2000-05-23
Ponomarenko, A.
Prime-mover dynamo plants
Plural prime mover
Plural prime movers with fluid interconnection
290 4R, 307 19, 322 22, F02D 4100, H02J 300
Patent
active
060668970
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an automatic load distributing apparatus for generators, and in particular, to an automatic load distributing apparatus for operating a plurality of diesel engine driven generators connected in parallel.
BACKGROUND ART
When a plurality of diesel engine driven generators are connected for parallel load operation, an automatic load distributing apparatus is provided to make loads on the respective generators substantially even. FIG. 8 is for explaining general construction of an automatic load distributing apparatus which is frequently used for conventional generators driven by diesel engines with Bosch fuel injection pumps.
Upon parallel load operation of such generators, a first diesel engine driven generator 20a and a second diesel engine driven generator 20b are arranged in parallel. The first diesel engine driven generator 20a is connected to a bus bar 23 via a wire 21a and a first breaker 22a. The second diesel engine driven generator 20b is also connected to the bus bar 23 via a wire 21b and a second breaker 22b.
The first diesel engine driven generator 20a is constructed of a first engine 24a, a first generator 25a, a first load distributing unit 26a, and a first rotational speed controller 27a. The second diesel engine driven generator 20b is of the same construction as the first diesel engine driven generator 20a and the description thereof is omitted below by labeling respective elements with corresponding reference numerals.
The first engine 24a is constructed of a first Bosch fuel injection pump 28a, a first governor 29a, a first actuator 30a, and a first rotational speed sensor 31a. A control lever 32a, installed on the first governor 29a, and a lever 33a, installed on the first actuator 30a, are connected by a rod 34a. The first actuator 30a and the first rotational speed controller 27a are connected by a wire 35a; the first rotational speed sensor 31a and the first rotational speed controller 27a are connected by a wire 36a.
The first load distributing unit 26a is connected to the first rotational speed controller 27a via a wire 37a, and to bus bars 38 and 40 of parallel line via wires 39a and 41a, respectively. The first load distributing unit 26a and the first generator 25a are connected via both a voltage detecting wire 42a and a current detecting wire 43a.
Hereinbelow, the description will be made first of a single load operation of the first generator 25a in the first diesel engine driven generator 20a, and then to a parallel load operation of the first generator 25a and the second generator 25b in the second diesel engine driven generator 20b.
First of all, the single load operation of the first generator 25a is described with reference to FIG. 2. FIG. 2 shows the rack position of the first fuel injection pump 28a in ordinate and the rotational speed of the first fuel injection pump 28a in abscissa. The rack position in the ordinate has one to one correspondence to the load factor of the output of the first engine 24a. Indicated from an operating point a to an operating point b is the upper limit of the rack position, which corresponds to 100% of the load factor. An operating point j indicates a rated output/rated rotational speed of the first engine 24a. Indicated from the operating point b to an operating point c is an actual range of use, which corresponds to an operating range of the first governor 29a. A rated rotational speed A is determined by the number of electrodes and the frequency of the generator in the case of an engine for the generator, where the engine is operated at constant rotational speed.
Upon no-load operation after completion of engine warm-up, the rack position is at an operating point c. Then when the first generator 25a is connected to the bus bar 23 by turning the first breaker 22a "ON" and a load, e.g., of 80% of the generator rated output value, is applied to the first generator 25a from the outside, the first governor 29a acts to transitionally move the rack position from the operating point c to an oper
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Komatsu Ltd.
Ponomarenko A.
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