JPS59201700A - Exciter - Google Patents

Abstract

PURPOSE:To improve the responsiveness of an exciter by enhancing an exciting power source voltage, and further providing a field current limiter. CONSTITUTION:When the voltage of a generator voltage terminal 1 decreases, an automatic voltage regulator 4 applies a signal of increasing the magnetism to a firing pulse controller 5. Thus, an exciter field voltage Efv is controlled to the maximum value, and an exciter field voltage Efi, a generator field voltage Gfv and a generator field current Gfi gradually rise. Then, when the voltage Gfv reaches the prescribed value, a control signal is applied from a field current limiter 16 to a firing pulse controller 4 so that the current Efi becomes constant. In this manner, the responsiveness of the exciter is accelerated, thereby rapidly suppressing the variation in the terminal voltage of the generator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an excitation device for exciting a synchronous machine.

A conventional excitation device of this type is shown in FIG. In the figure, 1 is a generator terminal voltage terminal, 2 is a transformer (hereinafter abbreviated as FT) that steps down the generator terminal voltage terminal 1, and 3
4 is an automatic voltage regulator (hereinafter abbreviated as AVR); 5 is an ignition pulse control device that supplies the output signal of AVR 4 to Cyrisk amplifier 6; T is an excitation power supply , 8 is the field voltage end of the exciter (hereinafter Ef
(abbreviated as V end), field current line of 9-place exciter (TEfi
13 is a field breaker that turns on and off the field current Efi of the exciter, 10 is an AC exciter of the generator, 11
is the output field voltage end of the alternator (hereinafter abbreviated as GfV end)
, 12 are field current lines (hereinafter abbreviated as CFI lines) of the alternator. 14 is a rectifier for the exciter 10, and 17 is a generator.

Next, the operation will be explained. Generator terminal voltage end 1 is PT
2, and the AVR 4 compares the PT measurement voltage and the set voltage so as to keep it constant with respect to the set value set by the voltage setting device 3. If the generator terminal voltage VT is lower as the difference amount, the magnetization is increased. If the value is higher, a signal indicating demagnetization is sent to the arc pulse control device 5.

The ignition pulse control device 5 outputs a pulse signal corresponding to the output signal of the AVR 4 to the thyristor amplifier 6. The SIRISK amplifier 6 converts the excitation power source into the field voltage Efv of the Efv line 8 and the field current Efi of the li:fi line 8 according to the ignition pulse output signal, and the field winding of the AC exciter 10. Output to line. The field electric field EEGfv and G of the Gfv line 11 of the cold generator 17 are used to control the field of the AC exciter 1o.
The field current Gfi of the fi line 12 is controlled so that the voltage at the generator voltage terminal 1 of the generator 1T matches the set voltage of the voltage setting device 3. Next, responsiveness will be explained. When the voltage at generator voltage end 1 drops Efv)li
The field voltage Efv of 8 changes stepwise as shown in FIG.

On the other hand, the field current Efi of the Efi line 9 increases with the time constant of the AC exciter 10 as shown in FIG.

The Gfv line 110 frost generator field voltage Gfv responds as shown in FIG. 4, and the Gfi line 120 generator field current Gfi increases as shown in FIG. 5.

Since the conventional exciter is configured as described above, the responsiveness of the exciter 10 when controlling the synchronous machine is determined by the time constant of the AC exciter 100 and the maximum value of the generator field voltage Gfv. In short, when a disturbance such as a failure occurs in this system, it is said that it is unprecedented to be able to quickly detect changes in the frost pressure at the generator voltage end 1 and quickly control the AC exciter 10. There were drawbacks.

This invention was made in order to eliminate the deficiencies of the conventional ones as described above, and it speeds up the responsiveness of the exciter without changing the time constant of the AC exciter and the generator field voltage Gfv at the Gfv end. The purpose is to provide an excitation device that can.

An excitation device according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 6, reference numeral 15 denotes an excitation type source that can output multiple output voltages higher than that of the conventional excitation power supply I, and 16 denotes a field current limiter that limits the field current Eft of the AC exciter 10.

Now, considering the case where the AVR 4 has increased magnetization pressure, the field voltage Efv at the Efv end 8 of the AC exciter 10 is output higher than before as shown in Fig. 7, so the field voltage at the Efi end 9 Even with the AC exciter 10 having the same time constant as the conventional device, the current Efi responds quickly as shown in FIG. 8, and the generator field voltage Gfv at the Gfv end 11 differs from that of the conventional device as shown in FIG. The same maximum value can be reached faster.

When the generator field voltage Gfv at the Gfv end 11 reaches a predetermined value, the field current Ef at the AC exciter 100Eft end 9
)G by the field current limiter 16 so as to keep i constant.
Control is performed as shown in FIG. 7 so that the value corresponds to the maximum value of the generator field voltage Gfv at the fv end 11.

In the above embodiment, the case of the AC exciter 1o has been described, but it is clear that a DC excitation system may be used and the same effects as in the above embodiment can be achieved.

As described above, according to the excitation device of the present invention, by increasing the excitation power supply voltage and adding a field current limiter, the response of the exciter is fast, and the response of the terminal voltage of the generator is fast. Therefore, it is possible to quickly detect fluctuations in the terminal voltage of the generator (when a system failure or other disruption occurs).

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing a conventional exciter, and Fig. 2 shows the field of a conventional exciter! Figure 3 shows the response of the field current of a conventional exciter. FIG. 4 is a characteristic diagram showing the response of a conventional generator field voltage, and FIG. 5 is a characteristic diagram showing the response of a conventional generator field current. Fig. 6 is an overall configuration diagram showing an excitation device according to an embodiment of the present invention, Fig. 7 is a characteristic diagram showing the excitation machine field VB lightning voltage tracking of the embodiment, and Fig. 8 is an excitation machine of the embodiment. Characteristic diagram showing the response of the field current) No. 9 is a characteristic diagram showing the response of the generator field voltage according to the same embodiment. Fig. 10 is a characteristic diagram showing the response of the generator field current according to the same embodiment. 1... Generator end predicted pressure end, 2... Transformer or PT
. 3...Automatic voltage setting device, 4...Automatic 1 field adjustment device,
5--Ignition pulse control device, 6--Silisk intensifier, 1--Excitation power supply, 8--Field voltage end or Efv end of exciter, 9--Field of exciter Current line or Eft line, 10... AC exciter, 11... Generator field voltage end or Gfv end, 12... Generator field current line or G
fi line, 13... Field breaker, 14... Exciter rectifier, 15... Excitation power source, 16... Field current limiter, 1T... Generator. (The same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa No. 1
Figure No. 6

Claims (1)

[Claims] In order to control the field current of the exciter for the generator, the measured voltage detected at the generator terminal voltage is compared with the set voltage, and based on the deviation signal between the two, the ignition pulse control device is sent to the ignition pulse control device via the SiRisk amplifier. In an excitation device that controls an excitation power source, the supply voltage of the excitation power source is increased, and the field current of the exciter is used as an input signal to cause the ignition pulse control device to control the field current. 4? Have you installed a field current IJ mitter that supplies the signal? An excitation device with a characteristic.