JPS59230430A - 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.

Conventional system stabilization devices of this type include a method for detecting the active power of a synchronous machine (usually called the ΔF method), a method for detecting the frequency from the terminal voltage of the synchronous machine (usually called the ΔF method), and a method for detecting the speed of the synchronous machine. There is a method (usually called the Δω method) for detecting the ΔF method.Here, the ΔF 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, 2 is a phase correction element of a system stabilization device, 3 is an amplification element of a system stabilization device,
4 is an automatic voltage regulator, 5 is a synchronous machine, 6 is a field breaker, 1 is a current transformer (hereinafter referred to as CT), and 8 is a transformer (hereinafter referred to as FT).

Next, the operation will be explained. The active power signal of the synchronous machine detected by the active power converter IK is passed through an adjustment device consisting of a phase correction element 2 and an amplification element 3, and the detected power signal is supplied to an automatic voltage adjustment device 4. On the other hand, the phase correction element 2 and the amplification element 3 are usually expressed by a transfer function G (31) as shown in equation (1) below.

However, here K......Amplification factor (gain constant) TR...- Door 14 time constant TLD 1......Second time constant TLGl・・・
......Third time constant TLG2...
Fourth time constant The first time constant of each term on the right side is determined by each time constant of this equation (1). If the second and third phase correction values are determined and the total phase correction value and amplification factor are appropriate values, the amount of excitation of the synchronous machine 5 is changed through the automatic voltage regulator 4 in response to fluctuations in active power. By doing so, it is possible to stabilize the power system.

In the conventional system stabilizing device of this kind, each constant of the adjustment device consisting of the phase correction element 2 and the amplification element 3 is uniquely determined under a single system configuration condition, When the system configuration conditions, which consist of a power transmission line network that can be adjusted in a wide variety of ways, change, the fixed constants of the regulating device are no longer optimal, and for this reason, the operation of disconnectors and circuit breakers installed on each power transmission line is necessary. The drawback was that it was no longer possible to ensure the stability of the system.

The present invention has been made to eliminate the drawbacks of the conventional systems as described above, and is capable of always exhibiting optimal functions in response to changes in system configuration conditions, and achieves adequate system stability with a simple configuration. The purpose is to provide a system stabilizing device that provides controllability.

An embodiment of the present invention will be described below.

FIG. 2 shows a system configuration diagram of a general power system.

In Figure 2, 5 is a synchronous machine, 11 to 14 are transmission lines, 1
5 to 18 indicate bus lines.

Further, FIG. 3 shows a configuration diagram of a system stabilizing device according to an embodiment of the present invention. 21 to 24 are four contacts that operate depending on system configuration conditions. In addition, 2 to 2' are each contact 21
Phase correction elements corresponding to ~24, 3~3' are also connected to each contact 21
A plurality of amplification elements corresponding to .about.24, each having a different constant, form four adjustment circuits in this embodiment.

FIG. 4 shows a block diagram in which the most effective stabilizing adjustment circuit for the system is selected from a plurality of adjustment circuits as the system configuration conditions change. In FIG. 4, 31 indicates contact points 21 to 24 AS based on operating state information of power transmission lines 11 to 14.
This is a contact operation selection device that selectively commands opening and closing of each rf.

Further, FIG. 5 shows a specific configuration diagram of the contact operation selection device [31]. In FIG. 5, 4o is an adjustment resistor, 41 to 44 are contacts for inputting operating status information of the sending WE lines 11 to 14, and 51 to
54 is a resistor that crosses the power transmission line. Furthermore, 60
is an amplifier, 61 to 64 are comparators that compare a predetermined system configuration condition pattern with the current system (h configuration condition), and 11 to 74 are relays that operate four contacts 21 to 24, respectively. It is.

Next, the operation of this embodiment will be explained. In addition, Figures 3 to 5
The operation of the system stabilizing device of this embodiment shown in the figure when applied to a power system as shown in FIG. 2 will be described as an example. In the grid-structured power system shown in FIG. 2, the combinations of system configuration conditions that allow power to be supplied to the bus 18 at the final stage with each of the transmission lines 11 to 14, whether significant or insignificant, are all possible. It is clear that there are nine possibilities.

However, since the transmission lines between the same busbars have almost the same data, the MIS has 4 combinations, assuming that the transmission lines 11 and 12 and the transmission lines 13 and 14 shown in Fig. 2 are the same. It will be limited to the street.

The present invention is an application of this idea. First, as a system stabilizing device, four sets each of phase correction elements 2 to 2' and amplification elements 3 to 3' are set optimally for four types of system configuration conditions. Be prepared. Next, the system configuration condition pattern of type 441J and the actual pattern obtained from the operation state information of power transmission #j111 to #j14 are compared, the closest system configuration condition pattern is selected, and the corresponding contact point 'C1 is activated. This can be explained using the contact operation selection device shown in the specific configuration of FIG. The actual system configuration conditions and the system configuration condition patterns of buildings 4 to 1 are sent to the 'C comparator 6 via the amplifier 6o.
1 to 64 are compared, and one of the relays 11 to 14 corresponding to the closest applicable system pattern is activated. Note that 4o is an adjustment resistor that provides a reference voltage, and 51 to 54 correspond to the transmission lines 1 to 14 shown in FIG. 2, respectively. means a simulated resistance selected by As a result, a system stabilizing device that is close to the optimum for any system 4δ configuration condition can be obtained in a plurality of adjustment circuits formed by a small number of phase correction elements 2 to 2' and amplification elements 3 to 3'. Can be done.

In the above embodiment, the hardware of the system stabilization device was mainly explained using contacts, operational amplifiers, etc., but all of these may be digital devices, or a combination of analog circuits and relay circuits, or a combination of digital circuits and analog circuits. However, it has the same effect as the above embodiment.

As described above, according to the system stabilizing device according to the present invention, several types of system stabilizing il! The node circuits are installed with varying control constants such as phase correction values and amplification factors, and are composed of operation selection elements that select the adjustment circuit for system stabilization that meets arbitrary system configuration conditions. A system stabilizing device that is close to the optimum according to the system conditions can be realized using a circuit 11 with a small number of parts, and moreover, it is controlled by an adjustment circuit that properly responds to changes in the power supply conditions, so it has excellent controllability. This has the effect of providing stability to the system.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional system stabilizing device, Fig. 2 is a block diagram of a power system illustratively shown to apply an embodiment of the present invention, and Fig. 3 is an embodiment of the present invention. Fig. 4 is a conceptual block diagram of a contact operation selection device that works as a part of the embodiment shown in Fig. 3;
A specific configuration diagram of the contact operation selection device shown in the figure is shown. DESCRIPTION OF SYMBOLS 1... Active power converter, 2-2'... Phase correction element, 3-3'... Amplification element, 4... Automatic voltage regulator, 5... Synchronous machine, 6... Field breaker, I...C
T, 8-...PT, 11-14...Power line, 15-1
8...Bus bar, 31...Contact operation selection device, 40...
・Adjustment resistance, 41-44...Contact, 51-54...
Simulated resistance, 60...Amplifier, 61-64...-Comparator, 71-74...Relay. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent: Masuo Oiwa No. 1 Figure 2 Figure 3 Inside Mitsubishi Electric Corporation Control Works, 1-1-2 Wadazaki-cho, Hyogo-ku, Kobe City Applicant: Mitsubishi Electric Corporation 2-2 Marunouchi, Chiyoda-ku, Tokyo No. 3

Claims (1)

[Claims] In the system stabilization device that detects the active power, frequency, or rotational speed signal from the synchronous machine and controls the amount of excitation to the synchronous machine via an automatic voltage regulator based on the input output signal of the regulator, The adjustment device has a plurality of adjustment circuits with mutually different phase correction values and amplification factors, and detects changes in the system configuration conditions of the system to which the synchronous machine is interconnected, and the adjustment device detects changes in the system configuration conditions of the system to which the synchronous machine is interconnected, and outputs the information from the adjustment device to the actual system. A system stabilizing device characterized in that the stability of the system is improved by selecting the adjustment circuit having the phase correction value and amplification factor that match the configuration conditions.