JP3320846B2 - Grid stabilizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-system power system stabilizing device for stabilizing power by cutting off a power supply or a load when a power system accident occurs.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram of a conventional system stabilizing device A system (1A) and B system (1B) having a two-system configuration. This will be described below. System stabilizer (1A, 1
B) transmits the system information (2) such as the voltage, current, circuit breaker, etc. of the own end and the other end to the accident detection units (11A, 11B) and the control units (12A, 12B).
B). System information (2) is input circuit (121A,
121B) and the next-stage control circuit (122A, 122B)
Output to In the control circuit (122A, 122B), control calculation is executed based on the system information (2) so as to cut off the high-speed optimal generator and the link point when a power system accident occurs. The shutoff commands (1221A, 1221B) are output to the output circuits (123A, 123B) at the next stage under the condition that an accident is detected.

The output circuits (123A, 123B) output a shutoff output to a generator and a link point corresponding to the shutoff command (1221A, 1221B). The cutoff output is output to the relay terminal block (3) via output lock switches (124A, 124B) provided at the next stage. The output of both series stabilizers (1
The cut-off outputs A, 1B) are wired-OR connected at the relay terminal block (3) and output to other devices.

The fault detectors (11A, 11B) detect the occurrence of a power system fault with a protective relay, and output a fault start signal (111A, 111B) of the fault type and fault mode to an input circuit (121A, 121B) of the next stage of the own system. Output. Further, the same signal is output to other streams. The self-system and other-system fault signals (111A, 111B) detected by the input circuits (121A, 121B) are input to the next-stage control circuits (122A, 122B). Here, it is determined that an accident has occurred in any of the series of accident signals (111A, 111B), and a shutdown command (1221A, 1221B), which is a control calculation result according to the accident type and accident aspect, is output to the next output circuit ( 123A, 123B). Output circuit (123A, 1
23B) outputs a shutoff output to the generator and the link point corresponding to the shutoff command (1221A, 1221B).

The output lock switch (124A, 124B) is provided between the output circuit (123A, 123B) and the relay terminal block (3) because the control output differs between the two series stabilizers (1A, 1B). In addition, since the shutoff outputs of both systems are wired-ORed at the relay terminal block (3), the output becomes excessive control. For this reason, the output lock switches (124A, 124B) are used to output control output from either one of the systems for the purpose of preventing the control accuracy from lowering.

The first factor of the difference in the control output is that the stabilizing devices (1A, 1B) of both systems always execute the control calculation asynchronously. The second point is system information of voltage and current (2)
There is an adjustment error of the input detection circuit (121A, 121B) that detects From the above two points, a difference occurs in the control calculation, and the control outputs of the two series stabilizing devices (1A, 1B) are different.

[0007]

In the conventional system, the apparatus has a two-system configuration, but the control output series is one system. For this reason, if the output series is incorrect, the operation value of the protection relay
If the system could not operate properly (misoperation) due to a control switch operation error or the like when the system accident occurred, the output of the other system was locked, so backup control could not be performed and the collapse of the power system or power equipment Causes damage.

[0008]

Means for Solving the Problems In the event of a power system accident, the power supply or load is cut off to balance the supply and demand of electric power, and the system has a two-system configuration of a regular system and a standby system. An accident detection unit provided for each series that outputs an accident start signal, a control unit provided for each series that outputs a shutoff command based on the own series and other series of accident start signals and the system information, and a cutoff command. An output unit that outputs a cutoff output based on each series is provided, a first unit that switches the output by specifying a normal or standby sequence in the output unit, a second unit that communicates the cutoff output between both lines, A means for outputting a cutoff output when the own sequence is designated as a service sequence by one means, and outputting a cutoff output on condition that no cutoff output from the service sequence has been output if the own sequence is designated as a standby sequence. Three hands Characterized in that it has a.

[0009]

In the system stabilizing device according to the present invention, the priority of the control output of both systems is designated by the first means (common use, standby sequence changeover switch), and the cutoff output signal of the own system is output to another system. In the event of a system failure, the control is preferentially performed in the service series, but in the event that the shut-off output is not output from the service series, control can be performed from the standby series.

[0010]

FIG. 1 shows a system stabilizing device (1A, 1A) according to the present invention.
1B), and FIG. 2 shows an output circuit (123A, 123A).
The detailed circuit of B) is shown. 1 and 2, the same parts as those in FIG. 3 are denoted by the same reference numerals. The feature of the configuration is that a normal / standby switch for inputting the cutoff output of the own system to the output circuit of the other system and designating the output priority system is provided. The other functions are the same as those of the related art.

In FIG. 1, an output circuit (123A, 123B)
The cutoff outputs (1238A, 1238B) are output to the relay terminal block (3) of the next stage and the output circuits (123A, 123B) of the other series.

The operation of the output circuit (123A, 123B) will be described with reference to FIG. The output circuits (123A, 123B) are AND circuits (1231A, 1232A, 1233A, 1231B, 1232B, 1233).
B), knot circuit (1235A, 1235B), OR circuit (1236
A, 1236B), a timer (1237A, 1237B), and a regular / standby switch (1234A, 1234B).

An AND circuit (1231A, 1231B) is a circuit for outputting a cut-off command when a normal series is designated, and an AND circuit (1232A).
A, 1232B) is a circuit for outputting a cutoff command when a standby sequence is designated. The AND circuits (1233A, 1233B) output a cutoff command from the AND circuits (1232A, 1232B) during a standby sequence by checking timers (1237A, 1237B) for a fixed time T, and a cutoff circuit (1235A). , 1235
This is a circuit that outputs a command under an AND condition with a shut-off command that has been detected in B) and further inverted. OR circuit (1236A,
Reference numeral 1236B) denotes a circuit for outputting a shut-off command in the ordinary series and the standby series.

The operation when the stabilizing device (1A) is used as a normal system and the stabilizing device (1B) is used as a standby system will be described below.
Both stabilizers A-system (1A) and B-system (1B) can be designated as A-system (1) by specifying the normal / standby switch (1234A, 1234B).
A) is normally used, and B system (1B) is operated in standby. When a system fault is detected, a shutoff command (1221A, 1221B) from the control circuit (122A, 122B) is output to the output circuit (123A, 123B).
B). Here, since the system A (1A) is in normal use and is in operation, an AND circuit (1231A) for determining whether or not the shutoff command (1221A) and the regular / standby switch (1234A) are in regular use.
The condition of A) is satisfied, and the cutoff output (1238A) of the normal system is output via the OR circuit (1236A) of the next stage.

On the other hand, since the B system (1B) is in standby operation, the conditions of the shutoff command (1221B) and the AND circuit (1232B) for judging standby of the service / standby switch (1234B) are satisfied. Next, after a predetermined time T has passed by the next-stage timer (1237B), a shutoff command is output to the next-stage AND circuit (1233B). In the other of the AND circuit (1233B), the cut-off output (1238A) already output a predetermined time T before the A system is detected by the knot circuit (1235B), and the cut-off command whose signal is inverted (1 → 0) is input. Is done. The condition of the AND circuit (1233B) is not satisfied, and the cutoff output (1238B) is not output from the B system (1B). The OR circuit (1236A, 1236B) is a circuit that outputs either a normal or standby shutdown command.
Similarly, assuming that the A system (1A) is a standby system and the B system (1B) is a regular system, and the operation is the reverse of the above operation, the operation described above will
The system (1B) outputs a cutoff output (1238B).

Next, the system A (1A) is used for the ordinary system, and the system B (1A)
It is assumed that B) is operated in a standby system, and an input circuit failure occurs in the A system (1A), an accident start cannot be detected, and the B system (1B) is normally detected. In system A (1A),
Although the service / standby changeover switch (1234A) is used normally, since the cutoff command (1221A) is not input, the condition of the AND circuit (1231A) is not satisfied and the cutoff output (1238A) is not output. In the system B (1B), the service / standby changeover switch (1234B) is on standby, and the shutdown command (1221B) is input because the accident start is normally detected. Here, the condition of the AND circuit (1232B) is satisfied, and a cutoff command is output to the AND circuit (1233B) after a predetermined time T has elapsed by the next-stage timer (1237B). One input of the AND circuit (1233B) is connected to the cut-off output (1238A) from the A system (1A) by a knot circuit (1235A).
The signal detected by the knot circuit (1235B) is inverted (0 → 1) and input as it is detected in B) but not output. Therefore, the condition of the AND circuit (1233B) is satisfied, and the cutoff output (1212B) is passed through the next-stage OR circuit (1236B).
38B) is output. Similarly, system A (1A) is a standby system,
If the system B (1B) is used as a normal system and the operation is reversed, the system B (1B) cannot detect an accident and the system A (1A)
Then, the cutoff output (1238A) is output.

That is, in both system operations, the outputs of the other systems are mutually taken in, and the service / standby changeover switch is designated as one system is used as the normal system and the other system is used as the standby system. When the cutoff output is not output from the series, the cutoff output is output from the standby series after confirming the cutoff output for a predetermined time T, thereby stabilizing the power system.

[0018]

As described above, according to the present invention, the system stabilization control is performed from the higher-priority regular sequence by designating the operation of both sequence stabilizing devices as the regular and standby sequences. Furthermore, in the event that control from the service line is not performed due to a device abnormality, it is confirmed that the control output from the service line is not output even after a certain period of time in the standby line, and then the system stabilization control is performed. . That is, the control output is output from one line by designating the regular and standby sequences. Further, by performing the stabilization control in the standby system when the service system is not operating, a system stabilizing device having extremely high control performance can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of a system stabilization device according to the present invention.

FIG. 2 is a block diagram of an output circuit according to the present invention.

FIG. 3 is a block diagram of a conventional system stabilization device.

[Explanation of symbols]

1A, 1B: system stabilization device, 2: system information, 3: relay terminal block, 11A, 11B: accident detection unit, 12A, 12B: control unit, 121A, 121B: input circuit, 122A, 122B: control circuit, 123A , 123B ... output circuit, 124A, 124B ... output lock switch, 1221A, 1221B ... cutoff command, 111
A, 111B: start signal, 1238A, 1238B: cut-off output, 12
31A, 1231B, 1232A, 1232B, 1233A, 1233B ... AN
D circuit, 1234A, 1234B ... switch, 1235A, 1235B ...
NOT circuit, 1236A, 1236B ... OR circuit, 1237A, 1237
B: Timer

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02J 3/00-5/00

Claims (1)

(57) [Claims] 1. An ordinary and standby system for shutting off a power supply or a load in the event of a power system accident to balance supply and demand of electric power.
It has a system configuration, and an accident occurs based on the system information of the power system.
It is provided for each series that performs detection and outputs the accident start signal.
The accident detection unit,
And a system that outputs a shutdown command based on the system information.
And a shutoff output based on the shutoff command.
Output unit to be provided for each series, and the output unit is commonly used
Or the first means for switching the output according to the designation of the standby system
And second means for exchanging the cutoff output between the two series,
If the first series is designated as a regular series by the first means,
Outputs a disconnected output, and if it is specified as a standby series, it will be a regular series
On the condition that no cutoff output is output
A system stabilizing device comprising a third means for outputting a force .