JPS6036720B2 - brushless synchronous machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brushless synchronous machine, and more particularly to a brushless synchronous machine having an excitation device suitable for a large-capacity synchronous generator including a thyristor in a rotating rectifier.

Various inventions have been made regarding the so-called thyristor brushless, which includes a thyristor in the rotating rectifier of a brushless synchronous generator, but all of them are inventions aimed at relatively small or medium capacity synchronous machines. In the case of a large-capacity synchronous generator, it is necessary to use multiple thyristors in parallel, but this point has not been considered.

In addition, in the case of a large-capacity synchronous generator, an automatic voltage regulator is required to keep the armature output voltage constant, but this automatic voltage regulator has various devices such as an underexcitation limiter, a cross current compensator, and a system stabilizer. Additional auxiliary equipment is required. In addition, in the case of a large-capacity synchronous generator, the field voltage increases and the withstand voltage between the field layers increases, but originally a rectifier with a control pole (thyristor) is used instead of a brushless excitation that uses only a normal rectifier without a control pole. Since the target is a far response compared to the device, it naturally requires a sealing amount.
For this reason, the field withstand voltage increases, but the output impedance of the AC exciter, which is the AC power supply for the rotating rectifier, is usually larger than the synchronous impedance of the transformer. When it is large, the sealing amount is small, and when there is no load, the sealing amount is large. The object of the present invention is to provide a system that enables various excitation controls necessary for the operation of large-capacity synchronous generators by providing an automatic voltage regulator for synchronous generators and an automatic voltage regulator for AC exciters on the fixed side. The purpose is to obtain a lista brushless synchronous machine.

FIG. 1 shows an embodiment of the invention. The rotating field 2 of the synchronous machine 1 is supplied with field current from an AC exciter 9 via a rotating rectifier 4 loaded on the same rotating body 14 (portion indicated by a dotted frame). It is arranged on the fixed side of the field 1 of the AC exciter, and is supplied with field current from the armature 7 of the sub-exciter via the rectifier 11. Thyristor 4a constituting the rotary rectifier 4
is phase-controlled by a first automatic voltage regulator 5 provided on the stationary side via a gate pulse generation circuit 12 and a first rotary transformer 3 that transmits the generated pulses from the stationary side to the rotating body. The first rotary transformer 3 is composed of a fixed winding 3b on the primary side and a rotating winding 3a on the secondary side. For the above-mentioned phase control, a synchronized power supply of the output voltage of the AC exciter 9 applied to the rotary rectifier 4 is required, and for this reason, the output of the AC exciter 9 is connected to the primary winding 6a on the rotating side, or 2 on the fixed side
It is applied to the first automatic voltage regulator 5 via a second rotary transformer 6 with a secondary winding 6b. The first automatic voltage regulator 5 includes a circuit 5b that detects the output voltage of the synchronous machine 1 and compares this detected voltage with the voltage set by the first voltage setter 5a, and a circuit that increases the voltage difference between the comparison circuits. 5c and a phase control circuit 5d that controls the pulse generation phase of the gate pulse generation circuit 12 of the thyristor 4a according to the magnitude of this increased signal, and can also apply a signal from the auxiliary device 20. Similarly to the first automatic voltage regulator 5, the second automatic voltage regulator 13 for making the output voltage of the AC exciter 9 constant has a circuit for detecting the voltage of the AC exciter 9 and a second automatic voltage regulator 13.
voltage setting device 13a, comparison circuit 13b, and difference increasing circuit 13
c and a phase control circuit 13d (here, the gate pulse generation circuit is included in the phase control circuit), and supplies DC current to the fixed side field 10 of the AC exciter 9.
The thyristor of the rectifier 11 is controlled.

Voltage detection of the second automatic voltage regulator 13 can share the output of the fixed side winding 6b of the second rotary transformer 6 for detecting the synchronizing signal to the first automatic voltage regulator 5. The output of the armature 7 of the sub-exciter is not only supplied to the field 10 of the AC exciter via the second rectifier 11, but also supplied to the first automatic voltage regulator 5 and the second automatic voltage regulator. 13 or as an auxiliary power supply for the auxiliary device 20 of the first automatic voltage regulator 5. The auxiliary device 20 is any device as required, such as an underexcitation limiter or a system stabilizer, and applies its output to the first automatic voltage regulator 5 to perform desired control. According to the configuration of the present invention, despite the thyristor brushless configuration, most of the automatic voltage control devices 5 and 13 other than the thyristor in the rotary rectifier can be installed on the fixed side rather than in the rotary body 14, so the capacity is large. It can control the various functions required for excitation control of synchronous machines.

Furthermore, most of the control parts are rotating bodies 1 that are subject to large centrifugal forces.
It is highly reliable because it is on the fixed side rather than within 4. Furthermore, by equipping the AC exciter 9 with an automatic voltage regulator 13, it is possible to reduce the need to apply an unnecessarily severe high voltage with respect to field withstand voltage, which is a problem in the case of a large-capacity synchronous machine.

[Brief explanation of the drawing]

The drawing shows an embodiment of the thyristor brushless excitation device of the present invention. 1 is the armature of the synchronous machine, 2 is the rotating field, 3 is the first rotating transformer, 4 is the rotating rectifier, 5 is the first automatic voltage regulator for the synchronous machine, 9 is the rotation of the AC exciter Armature, 1 river is the fixed side field of the AC exciter, 11 is the rectifier, 7 is the fixed side armature of the auxiliary exciter, 8 is the rotating field of the auxiliary exciter, 6 is the second rotating transformer, 20 is an auxiliary device added to the first automatic voltage regulator 5;

Claims (1)

[Claims] 1 A rotating field type alternating current generator, a rotating rectifier including a thyristor loaded in a rotating body together with a field coil of the generator and supplying a field current to the field coil, and an armature in the rotating body. a rotating armature-type AC exciter that is loaded and supplies AC power to the rotary rectifier; a rotating field-type sub-exciter that has a field in the rotating body and an armature on the stationary side; In an excitation device for a brushless synchronous machine, the excitation device includes a rectifier including a thyristor that rectifies the armature of the exciter and supplies field current to the fixed side field of the AC exciter. A gate pulse is generated for controlling the phase of the thyristor in the rotary rectifier according to the deviation signal, and this gate pulse is transmitted to the rotary rectifier through the first rotary transformer. The first for the alternator to be transmitted to the thyristor in the rectifier.
a second rotating transformer, which is loaded with a primary winding on the rotating side and a secondary winding on the stationary side, and transmits the output of the rotating side armature of the AC exciter to the stationary side; , a second automatic voltage that generates a gate pulse for controlling the phase of the thyristor of the second rectifier in response to a deviation signal between the voltage transmitted by the second rotary transformer and a second set voltage; 1. A brushless synchronous machine having a regulating device, wherein control outputs for various functions required by a large-capacity generator can be applied to the first automatic voltage regulating device.