JPH082147B2 - Power generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention particularly relates to a power generator using a wire wound induction machine.

(Prior art) In recent years, in preparation for large fluctuations in power consumption, when parallel operation with commercial power sources or other synchronous generators is performed and power consumption reaches a peak, power consumption is compensated for by peak power consumption. There is an increasing demand for so-called peak-cut generators, which reduce electricity consumption.

As a generator used in the peak cut generator, an induction generator is used because it is mainly structurally robust and does not require a special synchronizing input device when operating in parallel with other commercial power sources. Has been done.

(Problems to be solved by the invention) However, in recent years, due to the problem of facility efficiency, there has been a strong demand for using this peak cut power generation device as an emergency power generation device. However, the induction generator used in this peak-cut generator is difficult to operate independently because it receives the excitation current supplied from the parallel operation destination to generate electricity. It has been said that it cannot be used as a power generator.

As a solution to this problem, it is possible to replace the generator with an induction generator and use a synchronous generator, but the synchronous generator can operate independently, but on the other hand, a special synchronous injection device is required at the time of synchronous injection. There is a problem that it becomes expensive.

An object of the present invention is to provide a power generator using a wound-rotor induction machine that does not require special synchronization when operating in parallel with a commercial power source or the like and can also be operated independently as an emergency power generator. is there.

(Means for Solving Problems) A power generator according to the present invention provides a prime mover, a winding-type induction machine driven by the prime mover, a rotary armature-type AC exciter, and an output of the AC exciter. A rotary rectifier that converts the power into at least two phases of the two-hour winding of the winding-type induction machine, and a short-circuit device that electrically short-circuits the three phases of the secondary winding of the winding-type induction machine, Further, at least the AC exciter and the rotary rectifier are provided on the same axis as the winding type induction machine. (Operation) According to the power generator of the present invention, the power generator can be operated in parallel with the commercial power source, or can be operated independently. That is, when this generator is operated in parallel with a commercial power source or the like, the operation is performed by short-circuiting the three phases of the secondary winding of the wire-wound induction machine by the short-circuit device. At this time, since the wound-rotor induction machine functions as an induction generator, it can be used as a normal peak-cut generator that does not require a special synchronous charging device. At this time, it goes without saying that the excitation of the AC exciter is set to non-excitation.

Next, when operating this power generator as a single power generator, the short-circuit device is opened to excite the AC exciter. When the AC exciter is excited, the armature output of the AC exciter is converted into DC by the rotary rectifier, and power is supplied to at least two phases of the secondary winding of the wound induction machine. As a result, the wound-rotor induction machine functions as a synchronous generator, and unlike the induction generator, it is possible to generate electricity by independent operation without being supplied with an exciting current from a parallel operation destination.

As described above, the power generator of the present invention can be operated in parallel with the commercial power source and other synchronous generators without requiring a special synchronizing input device, and can be operated independently as an emergency power generator.

(Example) Hereinafter, the power generator of this invention is demonstrated with reference to drawings.

FIG. 1 is a system diagram of an embodiment of the power generator of the present invention. In FIG. 1, (1) is a winding-type induction machine IG 1
The secondary winding (2) is the secondary winding and electrically shorts the winding of two phases out of the three phases. (3) is the field winding of the AC exciter AE provided on the same axis as the wound induction machine, and (4) is this armature winding.

The output of the armature winding (4) is converted into direct current by the rotary rectifier (5), and the secondary winding of the electrically wound winding type induction machine IG and other non-short-circuited windings. It is configured to be powered. (7) is the output side of the rotary rectifier,
A so-called winding-type induction machine IG is a short-circuiting device that short-circuits the three phases of the secondary winding, and is composed of, for example, a transistor. (6) is a signal transmission device that transmits a control signal output from a control device (not shown) to this transistor, and is constituted by, for example, a rotary transformer.

(8) is an automatic voltage regulator that detects the output voltage of the wound-type induction machine IG and controls the excitation current of the AC exciter AE so that this output voltage becomes the set voltage. This is done by controlling the thyristor (9) connected to the line (3). When the control signal is transmitted to the short-circuit device (7), the contact opens when the secondary winding (2) of the wire wound induction machine IG is short-circuited by the short-circuit device (7). It is a switch that is interlocked.

Next, a method of operating the power generator according to the present invention will be described. When the generator is operated in parallel with the commercial power supply, the short-circuiting device (7) short-circuits the secondary winding (2) of the wire-wound induction machine so that the wire-wound induction machine does not require a special synchronous injection device. Drive as a machine. At this time, since the switch (10) is interlocked, its contact is open and no electric power is output from the AC exciter.

Next, when power is generated independently, the short-circuit device (7) is opened and the contacts of the switch (10) are closed. As a result, the automatic voltage regulator (8) is activated, and the exciting current is supplied from the AC exciter to the secondary winding of the wire wound induction machine through the rotary rectifier (5). Work as.

Further, in the present embodiment, since the short-circuit device, the rotary rectifier, the rotary armature type AC exciter and the like are provided on the same axis as the winding type induction machine, the brush and slip ring of the AC exciter are unnecessary, The entire device is compact and maintenance is easy.

FIG. 2 shows a system diagram of another embodiment of the power generator of the present invention. The difference from FIG. 1 is that the secondary winding (2) of the wire wound induction machine is mechanically coupled with a mechanical slip ring ( 20) and the circuit breaker (21) are short-circuited.

FIG. 3 is a system diagram of still another embodiment of the power generator of the present invention, in which the secondary winding (2) of the winding type induction machine is electrically connected to the two phases. The output of the rotary rectifier (5) is fed to the two phases of the secondary winding (2), and the secondary winding (2) is mechanically coupled to the slip ring (30) and the circuit breaker (31). ) And are configured to be short-circuited.

(Effects of the Invention) As described above, in the present invention, the synchronous generator can be used as an induction generator that can be operated in parallel with a commercial power source or the like without the need for a special synchronizing input device, and further can be operated independently. Since it can be used as a power generator, it can be used as a power generator having both a peak cut power generator and an emergency power generator, and its effect is great in terms of facility efficiency. In addition, since the rotary rectifier, rotary armature type AC exciter, etc. are installed on the same axis as the wound type induction machine, brushes and slip rings of the AC exciter are not required, and the entire device is compact and easy to maintain. become.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of an embodiment of a power generator of the present invention, and FIGS. 2 and 3 are system diagrams of different embodiments of the power generator of the present invention. IG: Winding type induction machine 1 ... Primary winding of winding type induction machine 2 ... Secondary winding of winding type induction machine AE ... AC exciter 3 ... Field winding of AC exciter 4 ... ... armature winding of AC exciter 5 ... rotary rectifier, 6 ... signal transmission device 7 ... short-circuit device, 8 ... automatic voltage regulator

Claims (1)

[Claims] 1. A prime mover and 2 driven by the prime mover.
A winding-type induction machine in which at least two phases of the next winding are short-circuited, a rotating armature-type AC exciter, and the output of the AC exciter is converted into DC, and the winding-type induction machine is short-circuited. Two
A rotary rectifier that feeds two phases of a secondary winding that is not short-circuited with the secondary winding and a secondary winding that is not short-circuited with the short-circuited secondary winding of the winding type induction machine are electrically opened and closed. And a short-circuiting device that operates in parallel with a commercial power supply, the excitation of the AC exciter is stopped, and the short-circuiting device does not short-circuit with the short-circuited secondary winding of the wire-wound induction machine. When the winding is short-circuited and power is generated independently, the short-circuiting device is opened, the excitation of the AC exciter is started, and the rotary rectifier is not short-circuited with the short-circuited secondary winding of the winding-type induction machine. A power generator characterized by supplying power to the secondary winding.