JP2795968B2 - Power system stabilizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an output switching method in a two-system grid stabilization apparatus of the present invention.

(Prior Art) FIG. 4 shows a conventional system stabilizing device A system (2
It is a block diagram of A), B system (1B). This will be described below.

The system stabilizing device (1A, 1B) receives external system information, that is, circuit breaker status, voltage and current, at the input unit (11A, 11B).
B). The detected information is stored in the calculation unit (12A, 1
2B), and constantly executes control calculations necessary for system stabilization. If a system fault occurs, the result of the control calculation is output to the output units (13A, 13B) of the next stage, and the output units (13A, 13B) output the corresponding power supply and load shutdown commands.

The shutdown command of both systems is ORed by the system stabilization system A (1A)
(14A) and a shutdown command is output to the external device. The reason why the output is set to OR is that even if one system is stopped or under inspection, control can be performed by the remaining system. That is, the power supply and the load are shut off by the OR output during the two-line operation and the output from the operation line during the one-line operation.

(Problems to be Solved by the Invention) In the conventional method, the shutoff command is OR-outputted for both series operation, so that the power supply and the load are interrupted (over-controlled) excessively unless the outputs of both series match. Therefore, there is a disadvantage that the control error is large and the system cannot be sufficiently stabilized. The inconsistency in the outputs is mainly due to detection errors at the input sections of both streams.

The present invention has been made in order to solve the above-described problem, and the apparatus is positioned in a service line and a standby line. It is an object of the present invention to provide a device having a function of switching and outputting.

[Configuration of the invention]

(Means and Actions for Solving the Problems) In order to achieve the above object, in the present invention, by providing an output series switching unit, when the dual system is operated, the output from the regular series is used. The output is switched from a standby series to an output from the standby series, and the output from the operation series is made possible during single-series operation.

(Example) Hereinafter, an example is described with reference to drawings. FIG. 1 is a block diagram of a system stabilizing device according to the present invention. In FIG. 1, the same parts as those in FIG. 4 are denoted by the same reference numerals. As a feature of the configuration, an output sequence switching unit (15A, 15B) that detects the operating state and the inspection execution state of both systems and automatically switches the output sequence is provided. Here, a description will be given assuming that the regular system is A system and the standby system is B system.

The output units (13A, 13B) output a shutoff command for shutting off the power supply and the load based on the AND condition of the operation result from the operation units (12A, 12B) and the switching result of the output switching unit (15A, 15B). Since the output sequence switching units (15A, 15B) always use one sequence as the output sequence, a shutoff command is output from either the A system or the B system.

FIG. 2 shows a detailed circuit of the output sequence switching section (15A, 15B). Symbols (15A1-4, 15A11, 15B1-4) in the figure are NOT circuits (15A7-10, 15B7-10) are AND circuits, and (15A5, 15B5) are OR circuits
Circuit, (15A6,15B6) is a flip-flop circuit,
Both circuits have the same circuit configuration.

First, the operation of switching the output series from the operating states of both series will be described.

During A-system operation and B-system operation The A-circuit operation establishes the AND circuit (15A7) and the OR circuit (1
By setting the flip-flop circuit (15A6) via 5A5), the A-series becomes an output series.

The B series is in operation, but the signal from the A series (the signal “1” of the AND circuit (15A7) is inverted by the NOT circuit (15A11) to “0”
And the flip-flop circuit (15B6) is in a reset state and does not become an output sequence.

A-system stop, B-system operation When A-system stops due to equipment failure, equipment lock, etc., AN
D circuit (15A7) does not hold and flip-flop circuit (15A
6) is reset by the establishment of the AND circuit (15A9) and is no longer an output sequence.

Since B series is A series stop, AND circuit (15B7)
Holds, the flip-flop circuit (15B6) is set via the OR circuit (15B5), and becomes an output sequence.

 As in the case of the A-system operation and B-system stop, the A-series becomes the output series.

The switching of the output series for is shown in the time chart of FIG.

From the above, during the operation of the system A, the system A is always in the output series and the shutoff command can be output. B only when A series stops
When the output system is switched to the system and the A system changes from stop to operation, the output system automatically switches from the B system to the A system.

Next, the operation of switching at the time of inspection will be described. In addition, during the operation of one system, the operation system is not checked.

Inspection of A-sequence during dual system operation During both-system operation, the output sequence is A-sequence as described above. When the A-series inspection is performed in this state, an A-system inspection request signal is output to the B-series. The B series detects this signal and performs an OR operation under the condition that the AND circuit (15B8) is established.
Flip-flop circuit (15B6) via circuit (15B5)
Is set, and the B sequence is switched to the output sequence. Next, when the output sequence is switched, the AND circuit (15B10) is established, and the inspection permission signal is returned to the A sequence. When the inspection permission signal is detected, the AND circuit (15A7) is not established in the A series, and the flip-flop circuit (15A6) is reset by the establishment of the AND circuit (15A9) and is not an output series. The output sequence is B
Since the system has been switched to the system, the system A can be inspected and the inspection is executed.

Inspection of B-sequence during both series operation During both-series operation, the output series is A-series as described above. When the inspection of the B series is executed in this state, the operation is the same as described above. The B-system inspection request signal is output to the A-series. When the A-series detects this signal, it
The circuit (15A8) is established and the flip-flop circuit (15
Since A6) is set, the AND circuit (15A10) is established, and the inspection permission signal is returned to the B series. When the B series detects this signal, it performs an inspection.

As described above, while the output series is held in the A series, the B series can be inspected and the inspection is executed.

FIG. 3-2 is a time chart for switching the output series for.

From the above, when the inspection of the A series is performed in the both-system operation, the output series is switched to the B series, the inspection is performed, and when the inspection is completed, the output series is switched to the A series again. A similar switching operation is performed when checking the B series, but the output series is maintained at the A series.

〔The invention's effect〕

As described above, according to the present invention, the output from the service line is used during both-line operation, and the output is switched to the standby line when the inspection of the service line is performed during both-line operation. Power (load) that can maintain output from the series
A system stabilizing device having a function of preventing overcontrol of interruption can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of a system stabilizing device according to the present invention, FIG. 2 is a circuit diagram of an output sequence switching unit of the present invention, and FIGS. 3-1 and 3-2 are diagrams of a system stabilizing device of the present invention. FIG. 4 is a block diagram of a conventional system stabilizing device. 1A, 1B… System stabilization device 11A, 11B… Input unit, 12A, 12B… Operation unit 13A, 13B… Output unit 15A, 15B… Output series switching unit 15A1 to A4, 15A11, 15B1 to B4 … NOT circuit 15A7 to A10, 15B7 to B10 …… AND circuit 15A5, 15B5 …… OR circuit 15A6, 15B6 …… Flip-flop circuit

Claims (1)

(57) [Claims] 1. An ordinary or standby system for shutting off a power supply or a load when a power system accident occurs to balance supply and demand of electric power.
In a system stabilizing device having a series configuration, a means for switching and outputting an output series to a normal series during both series operations by detecting a device state of both systems being operated or being inspected,
Means for switching the output series to the operation series during single-series operation and outputting the same, and means for switching the output series to the standby series and performing inspection of the regular series when performing inspection of the service series during operation of both series. A system stabilization device characterized by having: