JPS59230428A - System stabilizer - 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 a system stabilizing device that contributes to improving the stability of a power system.

Conventionally, as this type of system stabilization device, there are two methods: a method for detecting the active power of the synchronous generator (usually called the ΔP method), and a method for detecting the terminal voltage frequency of the synchronous generator (usually called the ΔF method). ), and a method for detecting the rotational speed of a synchronous machine (usually called the lω method), but here, the lP method will be explained as an example. FIG. 1 shows a configuration diagram of a conventional system stabilizing device. In FIG. 1, 1 is an active power converter, 211 is a phase correction element of the system stabilization device, 3 is an amplification element of the system stabilization device, 4 is an automatic voltage regulator (hereinafter referred to as AVR), 5 is a synchronization &q, e is a field breaker, 7
is a dredger (hereinafter referred to as CT) and an 8ti transformer (hereinafter referred to as P
(referred to as T).

The operation of a conventional system stabilizing device will be briefly explained. Effective "force converter 1" is transmitted through CT7 and PT8 arranged in the system.
The effective power of the synchronized light 'i & a5η) detected in this manner is passed through a 1-phase correction element 2 and an amplification element 3, and its power control signal is supplied to an automatic voltage regulator, that is, an AVR 4. Here, the phase correction element 2 and the amplification element 3 are usually expressed by a transfer function G(S) as shown in the following equation (11).

The first, second, and third phase correction values are determined based on the time constant of the stone block of this transfer function G (S), and if the overall correction value and amplification factor are appropriate values, they are effective. Phase correction element for power fluctuations2. The output signal of the amplification element 3 passes through the automatic voltage regulator 4 to change the amount of excitation of the synchronous generator 5, thereby making it possible to stabilize the power system.

The conventional system stabilizing device determines the setting constants such as the phase correction value and amplification factor of each of the phase correction element 2 and the amplification element 3 under a single system configuration condition. If the system configuration conditions become more flexible, the set constant values themselves will no longer be optimal, and in that case, it will not be possible to provide sufficient stability to the thread M, and the system configuration will change. Although setting constants should be changed in response to changes in conditions, this method has the disadvantage of not being able to do this.

The present invention has been made in order to eliminate the drawbacks of the conventional devices as described above, and an object of the present invention is to provide a system stabilizing device that can always perform optimal functions in response to changes in system configuration conditions. That is.

An embodiment of the present invention will be described below.

FIG. 2 shows a system configuration diagram of a general power system to which the system stabilizing device of the embodiment of the invention shown in FIG. 3 is applied. In FIG. 2, 5 is a synchronous generator, 11 to 14 are power transmission lines, and 15 to 18 are bus bars.

FIG. 3 shows a configuration diagram of a system stabilizing device according to an embodiment of the present invention. In FIG. 3, 2 and 3 are a first phase correction element and a first amplification element, respectively.

Further, 2' and 3' are the ninth phase correction element and the ninth amplification element, respectively, and 21 to 29 are the first to the ninth amplification elements, respectively.
These are contacts that are connected in series to the output terminals of the ninth amplification elements 3 to 3', and are operated separately according to the two-system configuration conditions. In Figure 1, there are no phase correction elements, no amplification elements, and no contacts, and only two, No. 1 and No. 9, are shown, but in reality, each of them is shown with a broken line.
There are a plurality of them, that is, nine in this embodiment.

Figure 4 shows four transmission lines 1 of the power system shown in Figure 2.
FIG. 2 is a circuit configuration diagram of a system identification logic circuit that identifies changes in system configuration conditions according to normality or abnormality of numbers 1 to 14; ■
The terminals □1 to 1□ are input signal terminals for normal/abnormal status signals of the power transmission lines 11 to 14, respectively. 'F7
Both L and L are logic elements. 0□〜0
．． is an output signal terminal of the logic circuit, and the @ output signal selects and operates the contacts 21 to 29.

The operation of the 31st embodiment will be briefly explained with reference to FIGS. 2 and 4.

Let us now consider the operation when the system stabilizing device of the non-embodiment is applied to the power system shown in FIG. Second
In the system configuration diagram shown in the figure.

As mentioned earlier, nine conditions for output signals 0□ to 0,1 can be considered to match the system configuration conditions associated with the normal and abnormal states of the transmission lines 11 to 14. It will be done. Each state of the power transmission lines 11 to 14 for obtaining each of these conditions can be easily detected from the open/close state signal of the disconnector or circuit breaker provided on each power transmission line, and this signal is shown in FIG. Input signal terminals of the system identification logic circuit shown in Figures 1 to □
, Eri is identified by human power.

Therefore, since each system configuration condition required from the system identification logic circuit shown in FIG. Each phase correction element at F2. It is only necessary to select in advance the phase correction value for each of the amplification elements 3 and the setting constant values such as the amplification factor, thereby ensuring optimal system stabilization at all times regardless of changes in system configuration conditions. It will be achievable.

In the above embodiment, the hardware contacts of the system stabilizing device were explained, but all of these can be easily replaced with digital devices, and the combination of analog circuits and relay circuits can be easily replaced. Alternatively, it is obvious to those skilled in the art that the same effects as in the above embodiments can be achieved by using a digital circuit and an analog circuit in parallel. Let us now also explain the operation of this embodiment.

Although the power system shown in Figure 2 has been disclosed as an example, the system configuration is not limited to that shown in Figure 2, and may be any other configuration, and the system identification logic circuit shown in Figure 4 should be designed accordingly. It is clear that this is a good thing.

As described above, in the system stabilizing device according to the present invention.

Install phase correction elements and amplification elements in the center of the system stabilization device for the number of types of system configuration conditions that can be considered,
Since the system is configured with a logic circuit that quickly selects the transfer function corresponding to the system information from the system information, it is possible to realize a system stabilization device that always has optimal controllability according to the system configuration conditions. effective.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional power system stabilization device, Figure 2 is a system configuration diagram of an example of a power system using a system stabilization device according to an embodiment of the present invention, and Figure 3 is an example of an embodiment of the present invention. FIG. 4 is a system identification logic diagram for identifying system configuration conditions from the system system 1 shown in FIG. 2. 1... Active power converter, 2, 2'... Phase correction element. 3.3'...Amplification element, 4...AVR, 5...Synchronous generator. 6... Breaker, 7... CT, 8... PT, 11
~12...Power line, 15~18...Bus bar, 21~
29...Contact. 11□~”Ill...Input signal terminal, L~L,
...Logic element, 0□~0. ...Output signal terminal. In addition, in FIG. 1, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa 1 Figure 2 Figure 3 Continued from page 1 0 Inventor Makoto Tanaka - Mitsubishi Electric Corporation Control Manufacturing Co., Ltd., 1-1-2 Wadazaki-cho, Hyogo-ku, Kobe ■ Application People Mitsubishi Electric Corporation 2-2-3 Marunouchi, Chiyoda-ku, Tokyo

Claims (1)

[Claims] The synchronous light' is used to excite the machine through an automatic voltage regulator using the output signal of a regulating circuit that inputs active power from a synchronous generator, such as a frequency or a status output signal such as rotational speed. In system stabilizers that control the amount of electricity. A system identification logic circuit that identifies changes in the system configuration conditions of the system to which the synchronous generator is interconnected, and a system that individually provides set power constants such as phase correction values and amplification factors according to each of the system configuration conditions. A system stabilizing device comprising: an adjustment circuit provided in accordance with a changing number of the system configuration conditions, and controlling the set power constant to an optimum value in accordance with the system configuration conditions.