JPS59230427A - Excitation controller of generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an excitation control device for a generator that controls the terminal voltages of 11 engines to be constant.

Conventionally, when exciting a generator, there are various types of excitation machines, but here, an excitation system using an AC exciter will be explained as an example of a conventional excitation control device. FIG. 1 shows a configuration diagram of an excitation control device using an AC exciter. 1st
In the figure, 1 is the generator 1 (1 machine), 2 is the field winding of this generator 1, 3 is an AC exciter that supplies this field winding with 2 voltage current, 4 is the field winding of the AC exciter 3 line, 5 is a thyristor amplifier that supplies current to this field winding 4, and 6 is a thyristor amplifier!
= a pulse generator for supplying control pulses to the device 5;
7 is a deviation amplifier, 8 is a voltage setting device, and 9 is a transfer generator (hereinafter P
10 is a deviation detector between the system voltage input signal from the PT 9 and the voltage setting device 8.

11 is the current f! flowing through the field winding 4! 12 is a disturbance prevention device that affects the stability of the excitation control system.

The operation will be briefly explained. A deviation detector 10 detects the deviation between the voltage setting signal set in the voltage setting device 8 and the returned human power signal from the PTQ sword 1 and the like.

The deviation is amplified by the amplifier 1, and the Noculus generator 6 generates a pulse cutting signal corresponding to the amount of deviation. The Sirisk amplifier 5 supplies a current corresponding to the phase of the Norculus output signal to the AC exciter 30 and the magnetic winding 4. The current in the field winding 2 of the generator 1 changes depending on the current flowing in the field winding 4 of the AC exciter 3. Therefore, when a deviation is detected by the deviation detector 10, by changing the current of the field winding 4 of the generator 1, the voltage setting device 8 sets the voltage at the generator terminal to a constant value t''L. The voltage is adjusted. This is the operation of the generator's excitation control device.' [72: The excitation control device, along with this generator terminal voltage constant control function,
will be connected, which will have a major impact on the stability of the Northern Electric Power System. When the constants of the generator 1 and the AC exciter 3 are fixed, the stability described above depends on the control constants of the amplifier 7 and the disturbance prevention device 12.

As described above, the conventional excitation control device for a generator has only one amplifier and one disturbance prevention device, and the control constants are set to be optimal for the situation. Therefore, the operation of circuit breakers, disconnectors, etc. occurs moment by moment! (In a power system that suffers from high voltage, the control state is not necessarily optimal because the system reactance varies. In addition, some methods detect the magnitude of the voltage change and switch the amplifier gain. When the voltage fluctuations in the grid are small, the gain of the amplifier is lowered to prevent even the slightest drop in the stability of the grid, and when the voltage fluctuations are large, the gain of the IM amplifier is increased to a high level. However, even with this method, it is difficult to always maintain the optimal state for the power system, and it is difficult to maintain the optimal state for the power system only by the magnitude of voltage fluctuation. It cannot be said that the current situation is fully understood.

This invention was developed in order to eliminate the drawbacks of the conventional methods described above, and instead of having to manually control the opening/closing information of circuit breakers in the power system, the invention always controls the power system in an optimal state. The purpose of this invention is to provide an excitation control device for a generator that is capable of controlling electricity.

An embodiment of the present invention will be described below.

FIG. 2 shows a configuration diagram of an excitation control device for a generator according to an embodiment of the present invention. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same or corresponding parts, so detailed explanation will be omitted. 1 in the same figure, 7 a * 7 b... 11 is an amplifier that provides an optimal control constant for each of the system configuration states of each power system, and 12 a ! 12b...12i
Similarly, a disturbance prevention device 13a has control constants optimal for the system configuration state of the power system.

13 b ・-13i #-i amplifier 7ar7b-7i
and contacts for selection of the disturbance prevention devices 12a, 12b...12i.

14II'i After receiving the system information of the power system circuit breaker.

Correspondingly, amplifiers 7a, 7b...7 with optimal constants
This is a logic circuit that selects one of the disturbance prevention devices 12a, 12b, . . . 12i. Figure 3 shows the second
Figure 15a to 1 show a simple configuration diagram of a Kubuta system, which is given as an example for the convenience of explaining the operation of the excitation control device of the embodiment.
5dtj: Breaker for each power transmission line.

16a to 16d are power transmission lines, and 17a to 17d are busbars.

FIG. 4 shows the a factor of the logic selection circuit 14 in the embodiment shown in FIG. In FIG. 4, Ia to Id are input terminals to which status information indicating the normal/abnormal status of the four power transmission lines 16a to 16d in FIG. 2 is input.

0□～0. is an output terminal, and L-L is a logic circuit. As shown in FIG. 4, in the power system shown in FIG. 2, there are nine types of system configuration conditions that can supply military swords from the bus 17a to the bus 17d at 1, and the output terminal 01 in FIG. ~0. corresponds to these nine system configuration states and has the number of jc terminals.

The operation of this embodiment will be briefly described using the system configuration conditions shown in FIG. 3 as an example. 1 The impedance on the grid side seen from the source IITML is naturally different between the case where all the circuit breakers of the transmission lines 16a to 16d are closed and the case where only the circuit breakers 15a and ISc are not closed. It becomes. Therefore, the stability of the system under each system configuration condition will naturally be affected. Therefore, in the logic selection circuit 14 shown in FIG.
3b...13i, the amplifiers 7a, e7b...71 and anti-disturbance devices 12a, 12b, whose control constants are preset to the optimum for each system configuration condition. ...Select 12i. 1
vinegar.

When all of the circuit breakers 15a to 15d are closed, the contact amplifier 7a and the disturbance prevention device 12aK are used to operate the contact 13a, but when only the circuit breaker 15d is opened, the logic selection is activated. The output signal of the circuit 14 is applied through the terminal o2, the contact 13b is operated, and the control can be performed using the amplifier 7b and the disturbance prevention device 12bK.

In this way, it is possible to realize an excitation control device that always performs control with optimal control constants according to the system configuration conditions of the power system.

In addition, the above F embodiment has been described by using an impedance signal on the side of the electric gun to open and close the circuit breakers 15a to 15d of the power transmission lines 16a to 16d.Of course, it is also possible to use an electric gun side impedance signal to open and close the circuit breakers. There may be no load. Naturally, this case is also included in the scope of the present invention. Further, in the embodiment, the disturbance prevention device 12 has been described as one that feeds back the current of the field winding 4 of the AC exciter 3, but the same effect can be obtained even if a phase corrector is installed in series with the amplifier I. It is obvious that sword 1 is effective.

Although the embodiment has been described with respect to a case where the system is configured using an analog device, the same function can be achieved using a digital device.

As described above, the generator excitation control device VcJ of the present invention:
f'L requires the installation of the necessary number of amplifiers, disturbance prevention circuits, and selection circuits based on system information using human input such as circuit breaker open/close status signals, etc., in response to changes in the system configuration conditions of the power system. Even under the system configuration conditions (power), the terminal voltage of one generator is accurately set to the constant value side σ1! This has the advantage of not only making it possible to control the power system, but also achieving highly effective control in improving and maintaining the stability of the power system.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional generator excitation control device. FIG. 2 is a block diagram of an excitation control device for a generator according to an embodiment of the present invention, and FIG. 3 is an explanation of the operation of the same embodiment. FIG. 2 shows a configuration diagram of the selection circuit of the embodiment. 1, r: The same reference numerals indicate the same or different parts. 1... Generator, 2... Field winding, 3... AC exciter. 4... Field winding, 5... Thyristor amplifier, 6...
・Pulse generator, 7a+7b...11...m amplifier, 8...voltage setting device, 9 river transformer or PT, 10...
・Deviation detector, 11... Flow divider, 12a, 12b...
・12i... disturbance prevention circuit, 13a, 13b=
13 i-=contact, 14... logic selection circuit, 15
a to 15d...breakers. 16a-16d...Power transmission line, 17a-17d...Bus bar. Agent Masuo Oiwa Figure 1 Figure 4 Continued from page 1 Inventor Masanori Shimizu Mitsubishi Electric Co., Ltd. Control Manufacturing Works, 1-1-2 Wadazaki-cho, Hyogo-ku, Kobe ■Applicant Mitsubishi Denki Co., Ltd. 2-2-3 Marunouchi, Chiyoda-ku, Tokyo

Claims (1)

[Claims] The terminal voltage of the generator and the deviation of the set voltage signal are input, and the optimum control constant is selected in advance according to changes in the system configuration conditions of the system connected to the generator.
2: A plurality of amplifiers, a thyristor amplifier which converts pulse signals of the amplifiers and supplies the thyristor amplifier, and an AC exciter that controls the excitation amount of the generator according to the output excitation amount of the thyristor amplifier. , a plurality of disturbance prevention circuits that detect the output excitation amount and adjust the magnitude of the deviation, and select the amplifier and disturbance prevention circuit that have predetermined optimal control constants according to the system configuration conditions of the system. An excitation control device comprising a selection circuit.