JPH07274399A - Controlling method for power distribution system - Google Patents

Abstract

PURPOSE:To assure safety of operation of a power distribution system and safety of a demander's load. CONSTITUTION:The power distribution system comprises power source side overvoltage, overfrequency and low frequency detector 124P and load side overvoltage, overfrequency and low frequency detector 124S at power source and load sides of individual line switches 12. When the load side of the switch 12 which is opened due to a fault or a cause of a power distribution line construction, etc., becomes an overvoltage, an overfrequency or a low frequency, the fault is detected by the detectors 124P, 124S, and closing of the switch 12 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commercial distribution system control method having interconnection of distributed power sources.

[0002]

2. Description of the Related Art FIG.
It is a block diagram which shows the structure of the conventional distribution system control method as shown in the October, 2nd issue. In FIG. 17, 1 is a main transformer provided in a distribution substation or the like, and 2 is a main transformer 1.
Secondary main circuit breaker, 3 busbars, 41, 42, etc. feeder breaker, 5 transformer, 6 protective relay for feeder, 7,
9, 11, 13 and 15 are sections of distribution line, 8, 10, 1
2 and 14 are line switches, 16, 17, 18, 19 and 2
0 is a consumer, 201 is an interconnection switch, and 202 is a load. Reference numeral 203 denotes a distributed power source such as a solar cell, a fuel cell, an engine generator, a hydroelectric generator or a wind power generator. 20
Reference numeral 4 is an interconnection control device, 25 transmission lines, and 30 is an information collecting device in a substation slave station for collecting and controlling information on switches of substations and distribution lines. Reference numeral 40 denotes a central device, which includes an information processing computer 401, a display 402, a memory 403, and the like.

FIG. 18 shows, for example, the document “Electrical Review” 199.
It is a block diagram which shows the structure of the conventional switch child station as shown in the October, 2nd issue. In FIG. 18, 122
p, 122s are control power transformers, 123p, 123s
Is a voltage presence / absence detector, 124 is a phase difference detector, 125 is a signal processing device, 126 is a signal transmission device, and 127 is a signal transmission path. Other switch slave stations 81, 101 shown in FIG.
141 is similarly configured.

The line switch 12 includes a switch closing coil 12a, a switch trip coil 12b, and a line switch 1.
It has an auxiliary contact 12c that opens and closes in conjunction with the two main contacts.

FIG. 19 shows the switch slave station 12 shown in FIG.
The voltage presence / absence detectors 123p, 123s set the detection level with voltage to 80% or more of the rating, and the detection level without voltage was 30% of the rated value. %, And the phase difference detector 124 sets the voltage phase difference detection frequency between the power source side p and the load side s to 15 °.

FIG. 20 is a block diagram of a customer having a distributed power source. In FIG. 20, 13 is a commercial distribution line, 131
Is a service line, 201 is an interconnection switch, 132 is a customer busbar, 202a is a load switch, 202 is a load, 203a is a distributed power switch, 203 is a distributed power supply, CT is a current transformer, W
HM is a power meter, RPR is a reverse power relay, OC is an overcurrent relay, PT1 and PT2 are transformers, φ is a synchronous detection relay, V1 and V2 are voltage relays, and 204 is an interconnection control device.

FIG. 21 is a logic diagram for explaining a conventional distribution system control method. In FIG. 21, Vp indicates the power supply side voltage of the line switch, and Vs indicates the load side voltage of the line switch.

Next, the operation will be described. In FIG. 17, for example, when the line switch 12 is artificially opened to perform distribution line construction of the section 13, etc., the customer 20 having the distributed power source is connected to the section 13, so Depending on the states of the power generation capacity and the load amounts of the sections 13 and 15, the voltages and frequencies of the sections 13 and 15 are the following four cases.

Case 1: Voltage and frequency remain steady. Case 2: The voltage or frequency rises above the rated value. Case 3: The voltage or frequency drops below the rated value. Case 4: The reverse electric power from the consumer 20 to the distribution system exceeds a specified value, the interconnection switch 201 of the consumer opens, and the sections 13 and 15 lose power.

Here, only the case 4 can achieve the initial purpose, and the other cases have the following problems.

[0011]

Since the conventional power distribution system control method is configured as described above, the power failure operation in the section of the specific distribution line is not reliably performed, and the charging factor of the section is not satisfied each time. Had to be investigated individually, which required a great deal of labor and time. Further, it is obvious that the increase of the voltage or the increase of the frequency as in the case 2 described above causes a serious problem to other general loads.
It goes without saying that Case 3 has the same problem.

The present invention has been made to solve the above problems, and provides a distribution system control method capable of ensuring the safety of the operation of the distribution system and the safety of the load on the customer. With the goal.

More specifically, as a condition for turning on the line switch once opened, overvoltage, overfrequency and low frequency conditions are added to prevent the turning on of different power sources and to prevent damage to the distributed power source side. To do so.

Further, as a condition for turning on the line switch once opened, the slip of the frequency on the load side is detected, the turning on of different power sources is blocked, and the distributed power sources are not damaged.

Further, as a closing condition of the line switch once opened, a slip of the load side frequency is detected in addition to the overvoltage, the overfrequency and the low frequency to prevent the different power supply from being turned on and the distributed power supply is not damaged. To do so.

Further, for the line switch once opened,
At the same time as turning off the power supply, the central unit sends an open command to all interconnected switches of the distributed power sources connected to the section, making the section non-voltage and at the same time to other consumers. Try to prevent poor quality power supply.

Also, for the line switch once opened,
At the same time as blocking the power supply, if the distributed power capacity of the section exceeds the load amount of the section, the central unit sends a voltage, frequency or phase control command to the distributed power source. , To supply power to a limited range.

[0018]

The first aspect of the present invention includes overvoltage / overfrequency / low frequency detection means for detecting overvoltage, overfrequency and low frequency on the power supply side and the load side of each line switch. When the load side of a line switch that has been opened due to an accident or distribution line construction becomes overvoltage, overfrequency or low frequency, an abnormality is detected by the overvoltage / overfrequency / low frequency detection means, and It is characterized in that control is performed to prevent closing of the line switch.

A second aspect of the present invention is provided with slip frequency detecting means for detecting the slip frequency between the power source side and the load side on the power source side and the load side of each line switch, and an accident or distribution line construction is performed. If a slip frequency occurs between the power supply side and the load side of the line switch that is open due to factors such as
An abnormality is detected by the slip frequency detecting means, and control is performed to prevent the line switch from being closed.

A third aspect of the present invention is an overvoltage / overfrequency / low frequency detecting means for detecting overvoltage, overfrequency and low frequency on the power source side and the load side of each line switch, and the power source side and the above Equipped with a slip frequency detecting means for detecting the slip frequency between the load side and the load side of the line switch which is opened due to accident or distribution line construction, etc.
If over frequency or low frequency occurs, the above over voltage, over frequency,
When the slip frequency between the power supply side and the load side of the line switch which is in the open state is detected by the low frequency detection means, the slip frequency detection means detects the abnormality and the line concerned is detected. It is characterized in that control is performed to prevent closing of the switch.

[0021] A fourth aspect of the present invention is to prevent the line switch from being closed, and at the same time, to a switch which is connected to a distribution system of a customer who has a distributed power source and is inserted in a section of the distribution line. The opening command is transmitted from the central device.

According to a fifth aspect of the present invention, the line switch is closed and at the same time, a voltage, frequency or phase control command is issued from the central unit to the distributed power sources that are also included in the section of the distribution line. It is characterized by transmitting.

[0023]

According to the first aspect of the present invention, the load side of the line switch which is opened due to an accident, distribution line construction, or the like causes an overvoltage,
When the frequency becomes over-frequency or low-frequency, an abnormality is detected by the over-voltage / over-frequency / low-frequency detecting means, and the line switch is closed.

According to the second invention, when a slip frequency occurs between the power supply side and the load side of the line switch which has been opened due to an accident, distribution line construction or the like, the slip frequency detecting means causes an abnormality. Is detected and the closing of the line switch is blocked.

According to the third aspect of the invention, when the load side of the line switch which is opened due to an accident, distribution line construction or the like becomes overvoltage, overfrequency or low frequency, overvoltage / overfrequency / low frequency detection means. By this, an abnormality is detected and the closing of the line switch is blocked. Alternatively, when a slip frequency occurs between the power supply side and the load side of the line switch, an abnormality is detected by the slip frequency detection means, and the line switch is closed.

According to the fourth aspect of the present invention, closing of the line switch is blocked, and at the same time, interconnection switching with a distribution system of a customer having a distributed power source that is also included in the section of the distribution line. An open command is sent to the container from the central unit.

According to the fifth aspect of the present invention, closing of the line switch is blocked, and at the same time, a voltage, frequency or phase control command is sent to the central part of the distributed power sources that are inserted in the section of the distribution line. Sent from the device.

[0028]

【Example】

Example 1 (corresponding to claim 1). Hereinafter, Example 1 of the present invention
Will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a switch slave station for power distribution control that employs a power distribution system control method according to the first embodiment. In FIG. 1, components corresponding to those shown in FIG. 18 are designated by the same reference numerals, and their description will be omitted. In FIG. 1, 124p is the line switch 12
On the power source side, 124s is provided on the load side of the line switch 12 for overvoltage detection, overfrequency detection and low frequency detection, and a power source side overvoltage / overfrequency / low frequency detector and a load side overvoltage / overfrequency It is a low frequency detector.

FIG. 2 is a table showing an example of the detection levels of the power supply side overvoltage / overfrequency / low frequency detector 124p and the load side overvoltage / overfrequency / low frequency detector 124s.
FIG. 3 is a logic diagram summarizing the closing conditions for the line switch 12 in the first embodiment with respect to the closing conditions for the conventional line switch 12. In FIG. 3, Vp indicates the voltage on the power supply side of the line switch 12, and Vs indicates the voltage on the load side of the line switch 12.

In the distribution system control method according to the first embodiment, when the line switch 12 is once opened and a voltage on the load side of the line switch 12 is present, the presence / absence of an overvoltage condition is detected and an overfrequency or low frequency is detected. Is detected by the switchgear slave station 121, the central device 40 grasps the situation, and if it is in an abnormal state, the central device 40 issues an alarm and prevents the line switchgear 12 from being turned on. This is to avoid turning on different power sources.

Next, the operation will be described. This Example 1
Then, when the line switch 12 shown in FIG. 1 is opened due to an accident in the distribution system or system switching, the control of the line switch 12 differs depending on whether or not there is another power source on the load side of the line switch 12. For example, when there is a distributed power source on the load side, it is necessary to control the state of this power source in consideration.
After the line switch 12 is opened, if the load amount of the target section is large with respect to the capacity of the distributed power source,
There is no problem because the overload protection relay or the reverse power relay on the distributed power source side operates and the distributed power source is disconnected from the distribution system by itself.

However, when the distributed power supply capacity exceeds or is approximately equal to the target section load amount, the distributed power supply stands up and supplies power to the load. The control of the distributed power source itself cannot follow the load fluctuation, resulting in overvoltage or overfrequency, low voltage or low frequency, and even the rated voltage reaches overfrequency or low frequency. In this embodiment, overvoltage (120% or more of the rating), overfrequency (105% or more of the rating), low frequency (95% or less of the rating) on the load side, even if the closing conditions are the same as the conventional conditions.
If any of the above conditions occurs, the load side overvoltage / overfrequency / low frequency detector 124s detects the abnormality, and the central unit 40 performs the closing command prohibition process on the line switch 12. For this reason, it is possible to prevent different power supplies from being supplied to the commercial power supply system and the distributed power supply system.

According to the first embodiment, the overvoltage, overfrequency and low frequency detecting means on both sides of the switch are provided in addition to the presence / absence of voltage detection and the phase difference detection. Due to the reason, the line switch which is once in the open state is not turned on when the central device determines that the voltage on both sides of the line switch is in the different power supply state, so that it is possible to prevent an accident caused by turning on the different power supply.

Embodiment 2 (corresponding to claim 2). FIG. 4 is a block diagram showing the configuration of a switch slave station for power distribution control by the power distribution system control method according to the second embodiment of the present invention. Components corresponding to those shown in FIG. However, the description is omitted. In FIG. 4, 124a is a slip frequency detector as a slip frequency detecting means for detecting the slip frequency between the power source side and the load side of the line switch 12.

FIG. 5 is a diagram showing an example of the detection level of the slip frequency detector 124a, and FIG. 6 shows the line switch 12 in the second embodiment with respect to the closing condition of the conventional line switch 12. It is a logic diagram which put together the input conditions.

In the second embodiment, instead of detecting the above-mentioned overvoltage, overfrequency and low frequency, the slip of the load side frequency with respect to the frequency of the power source side of the line switch 12 is used to switch the slave station 12 of the switch.
The slip frequency detector 124a of No. 1 detects the state and the central unit 40 grasps the state.
At the same time, an alarm is issued, and the closing of the line switch 12 is prevented so that the asynchronous supply to the distributed power source is avoided.

Next, the operation will be described. This Example 2
Then, the slip of the frequency of the voltage of the line switch 12 is detected, and the phase is the phase difference detector 124 for a moment.
Even if the above condition is satisfied, if the slip frequency exists between the two voltages, the closing of the line switch 12 is controlled.

According to the second embodiment, since the slip frequency detecting means on both sides of the switch is provided in addition to the voltage presence / absence detecting means and the phase difference detecting means, the section switch of the distribution line once opened. Since the central device does not turn on the power when it determines that the power source is in a different power state, it is possible to prevent an accident caused by turning on the different power source.

Embodiment 3 (corresponding to claim 3). FIG. 7 is a block diagram showing a configuration of a switch slave station for power distribution control by a power distribution system control method according to a third embodiment of the present invention, which is the same as that corresponding to the component shown in FIG. 1 and FIG. The reference numerals are given and the description thereof is omitted.

FIG. 8 shows an overvoltage / overfrequency / low frequency detector 1
24p, 124s and the respective detection levels of the slip frequency detector 124a are shown. FIG. 9 shows the closing conditions for the line switch 12 in the third embodiment as compared with the closing conditions for the conventional line switch 12. It is the logic diagram which put together.

Next, the operation will be described. This Example 3
Then, when the voltage on the load side of the line switch 12 becomes overvoltage, overfrequency or low frequency, or when the slip frequency between the power source side and the load side is detected, On the other hand, control is performed to prevent closing.

According to the third embodiment, the first embodiment and the second embodiment are provided.
Since it has both functions, it is possible to more reliably prevent an accident caused by turning on a different power source due to a switch that is once opened.

Embodiment 4 (corresponding to claim 4). FIG. 10 is a block diagram showing a power distribution system by a power distribution system control method according to the fourth embodiment of the present invention. 10, the components corresponding to those shown in FIG. 17 are designated by the same reference numerals, and the description thereof will be omitted. The switch slave station 121 in FIG. 10 has the same function as the switch slave station 121 in the first, second or third embodiment. Reference numeral 205 is a signal transmission device that performs state monitoring and open control of the interconnection switch 201 with the distribution system 13 of the customer 20. A signal transmission line 206 is connected to the central unit 40 through the transmission line 25.

FIG. 11 shows a customer having a distributed power source, and a trip coil 201a for opening the interconnection switch 201.
And the auxiliary contact 20 that is interlocked with the main contact of the interconnection switch 201.
FIG. 2 is a diagram showing that 1 b is connected to a coordination control device 204.

FIG. 12 is a logic diagram for controlling the opening of the distributed power supply interconnection switch 201 by using the means of the fourth embodiment in addition to the means of the first embodiment. When the line switch 121 is in an open state and the charge state of the load to the load side of the line switch 121 by the distributed power supply does not satisfy a predetermined condition, the distributed power supply interconnection switch connected to the target section. The central device 40 performs opening control for 201.

FIG. 13 is a logic diagram for controlling the opening of the distributed power switch 201 by using the means of the fourth embodiment in addition to the means of the second embodiment.

FIG. 14 is a logic diagram in which the means of Embodiment 4 is combined with the means of Embodiment 1 and Embodiment 2 to control the opening of the distributed power supply interconnection switch 201.

In the fourth embodiment, the state of the power on the load side of the opened section switch is grasped by the central device 40 by the configuration of the first, second or third embodiment and an alarm is issued, and at the same time, the section switch At the same time as preventing the input, the central device 40 issues an opening command to the switch which is connected to the distribution system of the customer who has the distributed power source connected to the section, and the low quality to the customer of the section. It prevents the supply of electric power.

Next, the operation will be described. This Example 4
Then, once the line switch 12 is in the opened state, if the closing prevention conditions described in the first, second or third embodiment are complete, the closing prevention control is performed, but the distributed power supply side is turned on and the voltage and the frequency are changed. It is clear that if power other than the rated value is supplied to the customers in that section, each power device of the customers will be damaged, and if such a state is detected by the central device 40, it will be immediately dispersed. An opening command is transmitted from the central device 40 to the interconnection switch 201 of the customer who has a power source. The interconnection switch 201 transmits the opened state of the auxiliary contact 201b included therein to the central device 40, and confirms that the interconnection switch 201 is opened.

According to the fourth embodiment, when the central device grasps the closing status of the line switch once opened, the distributed power source existing on the load side of the line switch is extracted and The central device issues an opening command to the switch that is connected to the customer's distribution system, and after a power outage for the relevant section, the central device issues a closing command to the relevant switch of the target distribution line. The power failure can be restored.

Example 5 (corresponding to claim 5). FIG. 15 is a single-line connection diagram of a consumer adopting the distribution system control method according to the fifth embodiment of the present invention. 15, components corresponding to those shown in FIG. 11 are designated by the same reference numerals, and their description will be omitted. In FIG. 15, reference numeral 204a denotes an integrated supervisory control device including distributed power sources of customers. 202a is a switch for turning on and off the load 202, and 203a is a distributed power source 203
A switch that turns on and off, PT1 is a transformer connected to the distribution system side, PT2 is a transformer connected to the power receiving bus in the customer, CT1 is a current transformer connected to the power receiving bus, and CT2 is a distributed power line. PT3 is a transformer connected to the distributed power supply line. V1 is a voltage relay connected to the transformer PT1, V2 is a voltage relay connected to the transformer PT2, φ is a phase difference detection relay connected between the transformers PT1 and PT2, and f is a transformer. A frequency relay connected to PT2, P1Q1 is a power relay that detects active power and reactive power of the power receiving bus, RPR is a reverse power relay that detects power flowing from the distributed power supply side to the distribution system side, and OC1 is power receiving Overcurrent relay of bus, OC2 is an overcurrent relay of distributed power supply, P2Q2 is a power relay for detecting active power and reactive power of distributed power supply.

In the distribution system control method according to the fifth embodiment, when the central unit determines that the load amount in the section exceeds the distributed power capacity of the section, the interconnection in the fourth embodiment is performed. Instead of the switch open command, the central unit sends a power generation control command to the distributed power sources.

Next, the operation will be described. Normally, the interconnection switch 201 is closed, the load switch 202a and the distributed power supply switch 203a are closed, and the load 202 and the distributed power supply 203 are operated within the rated capacity with respect to the distribution system 13. The line switch causes the above-mentioned factors (distribution system accident,
Once, the voltage of the load side of the open line switch is released when the capacity of the distributed power source 203 is equal to or greater than the load amount of the load of the line switch. If the central unit determines that the frequency deviates from the rated value, the central unit gives a control command to the distributed power source to the supervisory control unit 204a via the transmission path 206 and the transmission unit 205.

FIG. 16 shows the distributed power supply control logic. If the load side voltage Vs of the line switch 12 is an overvoltage, a voltage drop command is issued to the distributed power source. When the load side of the switch 12 has an over-frequency, a frequency drop command is issued to the distributed power supply, and when the load side has a low frequency, a frequency increase command is issued to the distributed power supply.

It is common that the load side of the line switch 12 has a low voltage when the distributed power supply is already overloaded, and is not shown in FIG. However,
In this case, it is easy to add a logic that issues a voltage increase command.

According to the fifth embodiment, when the central device determines that the load amount of the line switch once opened in the section exceeds the distributed power capacity in the section,
A power generation control command can be transmitted from the central unit to the distributed power sources.

[0057]

As described above, according to the invention of claim 1, the load side of the line switch which is once opened due to an accident or a switching of the system due to the construction of the distribution system, etc. If an abnormal state of overvoltage, overfrequency or low frequency is generated by pushing up from the connected distributed power source, it is configured to prevent the line switch from being closed. It is possible to prevent it, do not give an excessive shock to the distributed power supply, prevent damage to the distributed power supply equipment, and do not give unnecessary shock to the commercial power supply side. There is.

According to the second aspect of the present invention, the slippage of the frequency between the power source side and the load side of the line switch once opened is detected, and if the slippage exceeds a predetermined value, the switch is turned on. Since it is configured so as to prevent, it is possible to prevent the turning on of a different power source, and there is the same effect as above.

According to the invention of claim 3, in addition to the detection of overvoltage, overfrequency or low frequency on the load side of the line switch once opened, the slip frequency between the power supply side and the load side of the switch is detected. If they are detected and they are out of the specified value,
Since it is configured so as to prevent the switch from being turned on, there is an effect that it is possible to prevent a different power supply from being turned on, which is more reliable than the inventions of claims 1 and 2.

According to the invention of claim 4, the load side of the line switch once opened is only the distributed power source owned by the customer,
Since electric power is supplied to the load in the section of the distribution line, the distributed power supply side becomes overvoltage, overfrequency or low frequency depending on the capacity ratio with the power supply capacity in the section, and the switch of the opened switch is opened. If a slip frequency occurs between the power supply side and the load side, it is detected and the closing of the switch is blocked, and a switch that is connected to the distribution system of the customer with a distributed power source is connected. The power equipment of each consumer that was supplied with power from the distributed power supply configured to be opened is released from malicious electricity of overvoltage, overfrequency or low frequency, and damage and abnormal operation status of those equipment It has the effect of preventing accidents and disasters that induce it.

According to the fifth aspect of the invention, in the power supply state to the load in the section by the distributed power source existing on the load side of the line switch once opened, the state of overvoltage, overfrequency or low frequency is generated. If the power supply capacity is exceeded, the central unit compares the power supply capacity with the load amount, and if the power supply capacity is exceeded, the power generation control is performed from the central unit so that the various quantities become rated values for each distributed power supply. Since it is configured, an independent distributed power supply system can be configured, so that there is an effect that consumers in the target section can be continuously supplied with power.

[Brief description of drawings]

FIG. 1 is a block diagram of a switch slave station for power distribution control that employs a power distribution system control method according to a first embodiment of the present invention.

FIG. 2 is a list of function names of switchgear slave stations for power distribution control and their detection levels according to the first embodiment.

FIG. 3 is a logic diagram for explaining a distribution system control method according to the first embodiment.

FIG. 4 is a block diagram of a switch slave station for power distribution control that employs a power distribution system control method according to a second embodiment of the present invention.

FIG. 5 is a list of function names of switchgear slave stations for power distribution control and their detection levels according to the second embodiment.

FIG. 6 is a logic diagram for explaining a power distribution control method according to the second embodiment.

FIG. 7 is a block diagram of a switch slave station for power distribution control that employs a power distribution system control method according to a third embodiment of the present invention.

FIG. 8 is a list of function names of switchgear slave stations for power distribution control and their detection levels according to the third embodiment.

FIG. 9 is a logic diagram for explaining a distribution system control method according to the third embodiment.

FIG. 10 is a block diagram of a power distribution system that employs a power distribution system control method according to a fourth embodiment of the present invention.

FIG. 11 is a single-line connection diagram of a customer having a distributed power source according to the fourth embodiment.

FIG. 12 is a logic diagram for explaining a power distribution system control method according to the fourth embodiment.

FIG. 13 is a logic diagram for explaining another distribution system control method according to the fourth embodiment.

FIG. 14 is a logic diagram for explaining another distribution system control method according to the fourth embodiment.

FIG. 15 is a single-line connection diagram of a customer having a distributed power source that employs the distribution system control method according to the fifth embodiment of the present invention.

FIG. 16 is a logic diagram for explaining a power distribution system control method according to the fifth embodiment.

FIG. 17 is a block diagram of a distribution system adopting a conventional distribution system control method.

FIG. 18 is a block diagram of a switch slave station adopting a conventional power distribution system control method.

FIG. 19 is a list of function names and detection levels of a conventional switch slave station.

FIG. 20 is a single-line connection diagram of a customer having a conventional distributed power source.

FIG. 21 is a logic diagram for explaining a conventional distribution system control method.

[Explanation of symbols]

 12 line switch 121 switch slave station 122p power supply side control transformer 122s load side control transformer 123p power supply side voltage presence / absence detector 123s load side voltage presence / absence detector 124p power supply side overvoltage / overfrequency / low frequency detector 124s load side overvoltage / Over-frequency / low-frequency detector 124 Phase difference detector 125 Signal processing device 126 Signal transmission device 127 Signal transmission line Vp Power supply side voltage Vs Load side voltage 12a Switch closing coil 12b Switch trip coil 12c Switch auxiliary contact 124a Sliding Frequency detector 20 Customer with distributed power source 201 Interconnection switch 202 Load 203 Distributed power source 204 Interconnection control device 205 Signal transmission device 206 Signal transmission line 201a Interconnection switch trip coil 201b Interconnection switch auxiliary contact 204a Dispersion Power generation control and interconnection control device 3 Information collection device 40 the central unit 401 the information processing apparatus 402 display device 403 external memory device

Claims (5)

[Claims] 1. A power distribution comprising a line switch for controlling a section of a distribution line, a switch slave station for controlling the line switch, and a central device for processing information collected by the switch slave station. In the system control method, an overvoltage / overfrequency / low frequency detection means for overvoltage detection, overfrequency detection and low frequency detection is provided on the power supply side and load side of each line switch, and factors such as accidents or distribution line construction If the load side of the line switch that is opened in step 1 becomes overvoltage, overfrequency or low frequency,
A distribution system control method characterized in that an abnormality is detected by the overvoltage / overfrequency / low frequency detection means, and control is performed to prevent the line switch from being closed. 2. A power distribution system comprising a line switch for controlling a section of a power distribution line, a switch slave station for controlling the line switch, and a central device for processing information collected by the switch slave station. In the system control method, a slip frequency detection means for detecting the slip frequency between the power supply side and the load side is provided on the power supply side and the load side of each line switch, and it is open due to accidents or distribution line construction. When a slip frequency occurs between the power supply side and the load side of the line switch, the slip frequency detecting means detects an abnormality, and control is performed to prevent the line switch from being closed. Power distribution system control method. 3. A power distribution comprising a line switch for controlling a section of a power distribution line, a switch slave station for controlling the line switch, and a central device for processing information collected by the switch slave station. In the system control method, overvoltage / overfrequency / low frequency detection means for performing overvoltage detection, overfrequency detection and low frequency detection on the power supply side and the load side of each line switch, and the power supply side and the load side Slip frequency detection means to detect the slip frequency between is installed, and the load side of the line switch that is open due to an accident or distribution line construction causes overvoltage,
If over frequency or low frequency occurs, the above over voltage, over frequency,
When the slip frequency between the power supply side and the load side of the line switch which is in the open state is detected by the low frequency detection means, the slip frequency detection means detects the abnormality and the line concerned is detected. A distribution system control method, characterized in that control is performed to prevent closing of a switch. 4. The opening instruction is given to the switch which is connected to a distribution system of a customer who has a distributed power source and is connected to the section of the distribution line, while blocking the closing of the line switch. The transmission system control method according to claim 1, 2, or 3, wherein the transmission is performed from a central device. 5. The central switch is used to prevent the line switch from being turned on, and at the same time, a voltage, frequency or phase control command is transmitted from the central unit to distributed power sources that are also inserted in the section of the distribution line. The distribution system control method according to claim 1, 2 or 3.