JPS61109499A - Power system stabilizer - Google Patents

Abstract

PURPOSE:To prevent the terminal voltage of a generator from uselessly varying by disconnecting a power system stabilizer when a generator load normally varies. CONSTITUTION:A power system stabilizer 2 inputs a system fluctuation signal, and outputs a deviation to the set value to an adder 5. Thus, an excitation controller performs the automatic voltage regulating function for maintaining the terminal voltage of an AC generator constant and function for suppressing the power fluctuation of the system. A connecting/disconnecting contact 20 inserted to the output of the stabilizer 2 is driven to open synchronously with the operation start of the load regulator operating motor 14, and to close after the operation is finished. Thus, the variation of the terminal voltage of the generator is prevented due to the output of the stabilizer when the generator load varies.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power system stabilizing device provided in an excitation control system of an alternating current generator.

[Conventional technology]

This type of power system stabilizing device 'ζ has been previously described in Japanese Unexamined Patent Publication No. 53-4.4204. FIG. 2 is a blog diagram of an excitation control device incorporating this power system stabilization device, in which 1 is an input terminal for the deviation of the generator terminal voltage from the reference voltage value, 2 is the power system stabilization device, and 3
is an input terminal of this power system stabilizing device, 4 is a damping circuit, 5 is an addition circuit, 6 is a regulator, and 7 is an excitation device, which is controlled by the output of the regulator 6 and controls the excitation voltage of an alternator (not shown). adjust.

This power system stabilizing device 2 is provided to suppress fluctuations in the power system and improve its stability.The power system stabilizing device 2 is provided to suppress fluctuations in the power system and improve its stability. It is configured to take in the output frequency, rotation speed, effective output, etc. of the machine as a system oscillation signal, amplify and correct the deviation from these values, and input it to the adder circuit 6. As a result, the excitation control device described above In addition to the automatic voltage adjustment function of maintaining the terminal voltage of the alternator at a constant level, it also has the function of suppressing power fluctuations in the grid.

However, in this conventional configuration, if the power system stabilizing device 2 is configured to give a change in the active power of the generator output as a system oscillation signal, even if the generator load is changed, the power There is a problem in that the system stabilizing device 2 responds and changes the excitation amount of the excitation device 7 in the same way as when the power system is shaken, causing a malfunction that fluctuates the generator terminal voltage.

[Problem that the invention seeks to solve]

This invention was made to solve the above problems.
It is an object of the present invention to provide a power system stabilizing device that can be electrically disconnected from an excitation control system when the amount of excitation is not controlled, and can eliminate unnecessary operations of the excitation control system.

[Means for solving problems]

In order to achieve the above object, the present invention provides a contact in the output section, and the contact is configured to open when the load regulator of the generator prime mover is operated.

[Effect]

In this invention, during normal changes in generator load,
Since the output of the power system stabilizing device is cut off from the excitation control system, fluctuations in the amount of excitation caused by the power system stabilizing device are prevented.

〔Example〕

FIG. 1 shows an embodiment of the present invention, with 1 to
7 is the same as that shown in FIG. 2 above.

10 is an alternating current generator, and 11 is the field winding 1 of this alternator.
2 is a motor for driving a generator (steam turbine); 13 is a load regulator that adjusts the amount of steam supplied to the steam turbine; 1;
4 is a motor for operating the load regulator, 15 is a voltage detector that takes out the generator terminal voltage, 16 is a reference voltage generator, 17 is an addition circuit, 19 is a current detector that takes out the generator output current, 20
is a closing/disconnecting contact, which is connected to the power system stabilizing device 2.
It is inserted into the output part of the motor 1 for operating the load regulator.
It is configured to be driven to open in synchronization with the start of operation No. 4, and driven to close after the end of the operation. Note that the power system stabilizing device 2 is configured to take in the active power of the generator as a system oscillation signal. 4 In this configuration, when the load regulator operating electric motor 14 is operated, the output of the power system stabilizing device W2 is cut off to the exemplary control system, but the load regulator 13 is driven and the steam turbine 12 is When changing the generator output by adjusting the amount of steam supplied to the generator (this is not a power system fluctuation phenomenon, the power system stabilizing device 2 is not required).

In the present embodiment, the power system stabilizing device 2 functions effectively when the generator output changes due to the adjustment of the example amount, but when the generator load changes, the generator terminal voltage changes due to the output of the power system stabilizing device 2. Fluctuations are prevented.

In the above embodiments, the case where the electric motor of the generator is the above-mentioned turbine has been described, but the present invention can be practiced and similar effects can be obtained when the motor is a water turbine.

Also, when operating a load limiter instead of a load adjuster, contact 20
A similar effect can be obtained by opening the circuit.

〔Effect of the invention〕

As described above, the present invention disconnects the power system stabilizing device from the system during normal changes in the generator load, thereby preventing unnecessary fluctuations in the generator terminal voltage.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional power system stabilizing device. In the figure, 2 - power system stabilizing device, 13 - load regulator, 14 - electric motor for operating the load regulator, 20 - contact for closing/disconnecting. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] (1) In a power system stabilization device that is installed in the excitation control system of an alternator and improves the stability of the power system by controlling the amount of excitation of the excitation device, the output part has a contact for connecting and disconnecting the excitation control system. An electric power system stabilizing device characterized in that the contact point is opened when a load regulator of a prime mover that drives the alternating current generator is operated. (2) The power system stabilizing device according to claim 1, wherein the prime mover is a water turbine. (3) The power system stabilizing device according to claim 1, wherein the prime mover is the turbine.