JPH0923583A - Distribution system operation device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve equipment efficiency by creating a switch operating procedure that minimizes transmission loss during flexible transmission processing of distribution system switches. [Structure] Flexible power transmission from a distribution line to a flexible power supply segment that occurs during a distribution line accident or a work power outage or a section that has a load commensurate with the amount of overload to perform overload elimination operations. At this time, one or more power transmission routes to the electric power station bus linking the switch and the distribution line breaker linked to the interchange target section are obtained by the switch operating procedure creating means 6, and the voltage drop is further made from each of these power transmission routes. The power transmission route whose amount is within the set value is selected, the one with the smallest power transmission loss is selected from the power transmission routes selected by this means 6 by the power transmission loss determination means 5, and each of the power transmission routes selected by this means 5 is selected. The switch operation instruction means 7 outputs an open / close operation instruction to the switch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution system operation device for performing flexible operation when performing control such as recovery operation, work planning operation and overload elimination operation in case of accident in the power distribution system.

[0002]

2. Description of the Related Art A power distribution system operating device is usually provided in a power distribution system, and this power distribution system operating device has a function of performing the following three controls. First of all, when an accident occurs in a power distribution section, detection of the occurrence of an accident, detection of the accident section and judgment of the concession section (accommodation target section) and transmission of the concession transmission from other distribution lines to this concession section. Second, control of recovery operation at the time of an accident, secondly, when a work power outage occurs in an arbitrary power distribution section, the concession section is judged based on the work power outage command, and the concession transmission from another distribution line to this concession section. Control of the work plan operation that performs the third, and thirdly, when the load on the distribution line that has become overloaded is eliminated, the control of the overload elimination operation that exchanges the load commensurate with eliminating the overload from other distribution lines Is. Conventionally, the following three conditions are required as conditions for the power transmission route operating device to determine the power transmission route regarding the accommodation process for transmitting power to the concession section. (1) No overload occurs. (2) Good quality electricity (the amount of voltage drop is within the allowable value) can be accommodated. (3) The reserve capacity of the distribution line after the accommodation is left. However, in the conventional device, the transmission loss from the transmission source to the interchange section has not been taken into consideration.

In recent years, the social situation against the demand for power demands efficient power supply due to the tight power supply. In the conventional system as described above, the power transmission loss accommodated by the power source is taken into consideration. Since it has not been done, the problem remains that flexible power transmission with good equipment efficiency cannot be provided.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is economically advantageous to perform electricity-efficient electricity processing by performing processing that reduces transmission loss during accommodation processing. It is an object of the present invention to provide a distribution system operation device that can be supplied.

[0005]

In order to achieve the above object, the present invention provides opening / closing information of a distribution line breaker for deriving a distribution line and opening / closing states of various switches for dividing or linking the distribution line into a plurality of sections. Information, load current information of each distribution line, connection information indicating how each section is connected, etc. of the distribution line detected using the fault section or distribution line in the overloaded state. Transfer power from another distribution line to a section with a load commensurate with the amount of overload, or to a concession target section such as a work power outage section of a distribution line that has been determined in advance by a facility change plan such as facility expansion / removal. In the distribution system operation device, the one or more power transmission routes from the interchange target section to the electric power station bus through the switch and the distribution line breaker are obtained, and the voltage drop amount from each of the power transmission routes is set to a set value. Within The power transmission route is selected by the switch operation procedure creating means 5, the power transmission route having the minimum power transmission loss is selected by the power transmission loss determining means 6 from the power transmission routes selected by the switch operating procedure creating means 5, and this power transmission loss determination is performed. The opening / closing operation instruction output means 7 outputs an opening / closing operation instruction to each of the switches on the power transmission route selected by the means 6.

[0006]

[Operation] The transmission loss is calculated from the transmission distance and the passing current for each transmission route from the interchange target section to the electric power station bus through the switch, the distribution line breaker, and the transmission route with the minimum transmission loss. Is selected, and a switching operation instruction is output to the switch on the power transmission route with the minimum loss, so that the power transmission loss is reduced during the accommodation process.

[0007]

An embodiment will be described below with reference to the drawings. FIG.
Is a configuration diagram of an embodiment of a distribution system operation device according to the present invention represented together with a part of a distribution line constituting a distribution system,
Distribution line breaker CB for deriving the distribution line TL, and switch groups SW1, SW for dividing the distribution line TL into appropriate sections
2, ... TC slave station 1-1 that transmits the current value of the distribution line and the switching status signal of the switch from the distribution system configured by SW4
1-4, a TC master station 2 that controls these TC slave stations, and an arithmetic unit 3. This arithmetic unit 3 is composed of the following means 4-8. First, the interchange target section detection means 4 has a well-known function, and the distribution line breaker CB is cut off based on an accident of the distribution line and closed again, and then the switches are sequentially turned on, and immediately after turning on. The fault section is detected when the fault current flows again and the circuit breaker CB re-blocks. For example, if an accident occurs in the section a2, the breaker CB is cut off by the action of a protection relay (not shown), and the circuit is closed again after a predetermined time. Then means 4
Turn on sequentially from the division switch near the power supply side. If the circuit breaker CB is re-cut immediately after the switch SW2 is turned on, the section a2 is detected as the accident section and the circuit breaker C is detected.
After B is closed again, switch SW2 is closed. As a result, the load side section a3 adjacent to the accident section a2 becomes a sound power failure section, and the link switch SW is connected from the distribution line on the left side in the figure.
Power transmission will be interchanged via the four. In the present invention, such a section a3 is referred to as a concession section or a concession target section.

Next, the power transmission loss determining means 5 will be described. The power transmission loss determination means 5 compares and determines the power transmission loss obtained from the power transmission route from the substation determined by the power exchange operation that has occurred in the distribution system to the interchange target section, with a preset allowable value for each power transmission route. In addition, since the distance between each section on the power transmission route is known in advance and the impedance per unit length is also known, the power transmission loss is determined if the power transmission route is determined and the magnitude of the current flowing in each section is known. , Easy to find. As for details of the comparison judgment, as shown in FIG. 4, is the transmission loss within the allowable value? And is it the smallest of the existing candidates? Is determined. The switch operating procedure creating means 6 creates the operating procedure of the switch so as to exchange electricity through the power transmission route determined to minimize the power transmission loss based on this determination result. The switch operation instruction means 7 is means for executing the procedure created by the switch operation procedure creating means 6 via the TC master station 2 and the TC slave station 1. Then, when the comparison result by the power transmission loss determining means 5 exceeds the allowable value, the notifying means outputs that effect.

FIG. 2 shows a distribution line system including four distribution lines a, b, c and d to which the device of the present invention is applied. In FIG. 2, a circuit breaker CB-a for distribution line
CB-d (square symbol), section switches SW1 to SW
10 (triangular symbol), and a link switch SWC1 installed for the purpose of linking with other power distribution systems and always open.
~ SWC4 (marked with a circle). Here, the distribution line a is linked to the distribution line b via the link switch SWC2, and the distribution line c is linked via the link switch SWC1.
Is associated with. Similarly, the distribution line b is a link switch SWC.
Via 2 and the distribution line a, and also the switch SWC
It is linked to the distribution line d via 4. The distribution line c is linked to the distribution line a via the link switch SWC1 and is linked to the distribution line d via the link switch SWC3. The distribution line d is linked to the distribution line c via the link switch SWC3, and is linked to the distribution line b via the link switch SWC4.

Next, the outline of the operation of the device of the present invention will be described with reference to FIGS. In such a system condition, when an accident occurs or a power failure occurs in the section a-2 (hatched area) due to the work plan, the sections a-3 and a-4 from the switch SW2 to the switch SWC1 are sound. It becomes a blackout section. A link switch capable of accommodating electric power in this healthy section is obtained from the online information of the switch obtained via the TC slave station-TC master station, and the accommodating procedure is created in consideration of the reserve capacity of the distribution line of the concession source. In this case, there are two linked switches in the sound interruption sections a-3 and a-4, that is, S
There are WC1 and SWC2. One linked switch SWC1
The following three routes are considered as the power transmission routes that can be accommodated. First of all, based on the section a-4, the first one is the link switch SW.
C1 → SWC3 → SWC4 → Circuit breaker CB-b → Distribution line b
Route to SW, ie SWC1 → SW8 → SWC3 → SW
10 → SWC4 → SW6 → SW5 → SW4 → CB-b, and the second route is the route linked to the distribution line c, that is,
SWC1 → SW8 → SW7 → CB-c, and the remaining route is the route to the distribution line d through SWC3, that is, SW
C1 → SW8 → SWC3 → SW9 → CB-d. The transmission route that can be interchanged from the other link switch SWC2 is also SW
Similar to C1, a total of 3 routes to distribution lines b, c, d can be considered. For each transmission route created in this way, the transmission loss is determined using the impedance based on the transmission distance from the distribution line breaker to the transmission operation switch linked to the interchange target section and the sending current detected near the breaker. The calculated value is calculated, and the calculated value is compared with the allowable value set in advance for each power transmission route by the power transmission loss determining means 5 to obtain the procedure for minimizing the power transmission loss. When the determination unit 5 determines that all the calculated values exceed the allowable values, the switch operation procedure creation unit 6 creates a procedure for accommodating using a switch that is linked to another system. Then, the switch operation instruction means 7 outputs an operation execution instruction to the TC master station 2 in accordance with the switch operation procedure.

Next, the details of the processing performed by the arithmetic unit 3 will be described with reference to the flowcharts of FIGS. 3, 4, 5, and 6. First, the switch operation procedure creating means 6 will be described with reference to FIG. Step 3S-1 is a group of switchgear (K) SWC1 linked to the already-acquired sound power failure sections a-3 and a-4 when a power failure occurs in the distribution system.
, SWC2 is calculated. Next, step 3S-2 is the switch group SWC1, SWC2 (K) obtained in the above step.
Then, the distribution lines linked with each other are searched, and the distribution line groups (H) b, c, d of the interchange candidates are obtained in consideration of the reserve capacity of the distribution lines. Next, in step 3S-3, the electrical quality of the interchange candidate distribution line group (H) is good (the voltage drop amount is within the allowable value).
The combination (h) of the switch operating procedures is calculated, and if there are a plurality of storages for each power transmission route, these are stored in the storage means.

Next, the transmission loss determining means 5 will be described with reference to FIG. Step 4S-1 takes out a set of power transmission routes (combined of switch operating procedures) obtained above, and step 4S-2 determines whether or not transmission loss has been checked for a plurality of power transmission routes. judge. When the check is completed for all the sets (Y) and the power transmission route is not determined in the next step 4S-3, it indicates that there is no procedure satisfying the power transmission loss in the procedure for accommodating the power failure section. ing. The check is completed for all the combinations in step 4S-2, and step 4
If the power transmission route is determined in S-3, the interchange procedure using the power transmission route is taken over by the switch operation instruction means 7 described later. Next, in step 4S-4, the transmission loss is obtained from the sum of the constant lengths of all the sections existing in the power transmission route and the sending current (current near the breaker or current in each section) of the distribution line. In step 4S-5, it is determined whether or not the power transmission loss obtained in 4S-4 is within a preset allowable value and is minimum, that is, is smaller than one set of already calculated h. If the result of determination is that the allowable value is not exceeded or not the minimum value, the next set of procedures is taken out in step 4S-6. If it is within the allowable value and is the minimum value, step 4S-7 stores the extracted procedure as a transmission loss procedure.

Next, the switch operation instruction means 7 will be described with reference to FIG.
Will be described. In step 5S-1, one operation procedure is taken out from the determined interchange procedures. Step 5S-
2 determines whether or not all procedures to be operated have been executed. As a result of this determination, if all the procedures to be operated have not been executed, a control instruction is given to the TC master station 2 for each operation procedure in step 5S-3.

Next, the alarm notification means 8 will be described with reference to FIG. Step 6S-1 indicates that if the accommodation procedure is determined to be undecided in step 4S-3, the power transmission loss equal to or less than the allowable value is not satisfied, and the operator is notified of the alarm.

The embodiment described above is a case in which the device of the present invention is used for flexible power transmission to a healthy section in the event of a distribution line accident, but the present invention is not limited to this, and during a work power failure. It is also applicable to the flexible operation processing of It can also be applied to overload elimination operation when the distribution section is overloaded.

FIG. 7 shows the power distribution system when an overload occurs.
Since the connection state of the breaker, the division switch, and the link switch is the same as in the case of FIG. 2, the description of the connection relationship is omitted.
In the system state of FIG. 7, when an overload condition occurs on the distribution line b, sections b-1, b-2, b-3, b-4 forming the distribution line b to eliminate the overload. Find the amount that is appropriate to eliminate the overload from. An example will be described in which the section b-4 (hatched portion) corresponds to an amount commensurate with overload elimination.

Next, in order to prepare an accommodation procedure for depositing this section load on the associated distribution line, a switch and a power transmission route associated with the accommodation target section are obtained. Link switch is SWC4
There is only one power transmission route that can be interchanged from this link switch SWC4, and the following three routes are considered.
(SWC4 → SW10 → SWC3 → SW8 → SWC1 → S
W3 → SW2 → SW1 → CB-a) and distribution line c (SWC4
→ SW10 → SWC3 → SW7 → CB-c) and distribution line d (S
WC4 → SW10 → SW9 → CB-d). When the power transmission route is obtained in this way, the subsequent processing is the same processing as the restoration operation of the sound power failure section due to the accident or the work plan.

[0018]

As described above, according to the present invention, at the time of accommodation processing of a distribution system, a switch is provided so that transmission loss of a transmission route for supplying power to a healthy blackout section, which is an accommodation section, is reduced. Since the operation procedure is created, it is possible to provide a distribution system operation device capable of operating the distribution line efficiently.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a power distribution operating device according to the present invention,

FIG. 2 is a diagram showing a distribution system,

FIG. 3 is a flowchart showing the processing contents of a switch operating procedure creating means,

FIG. 4 is a flowchart showing the processing contents of transmission loss determination means,

FIG. 5 is a flowchart showing the processing contents of the switch operation instruction means,

FIG. 6 is a flowchart showing the processing contents of the notification means,

FIG. 7 is a distribution system diagram for explaining overload elimination operation,

[Explanation of symbols]

 CB ... Distributor breaker SW1, SW2, SW3 ... Differential switch SW4 ... Coupling switch 1 ... TC slave station 2 ... TC master station 3 ... Computing device 4 ... Interchange target section detection means 5 ... Transmission loss determination means 6 ... Switch operation procedure creating means 7 ... Switch operation instruction means 8 ... Notification means

Claims (2)

[Claims] 1. Information on switching of a distribution line breaker for deriving a distribution line from an electric power station bus, switching state information of various switches dividing or linking the distribution line into a plurality of sections, load current information of each distribution line, A faulty section of a distribution line detected using connection information that shows how each section is connected, or a section with a load commensurate with the overload amount of the distribution line in an overloaded state, or in advance In a distribution system operation device configured to perform interchange power transmission from a specified power distribution line, such as a work power failure section, from another power distribution line linked to this, a switch and a distribution line cutoff And one or more power transmission routes to the electric power station bus via the switch, and a switch operating procedure creation means for selecting a power transmission route with a voltage drop amount within a set value from each of these power transmission routes, and Transmission loss is calculated from impedance and current information based on the transmission distance for each transmission route selected by the switch operating procedure creation means, and the transmission route that has the smallest transmission loss among the calculated transmission losses is selected. A distribution system operation device comprising: a determination unit; and an opening / closing operation instruction output unit that outputs an opening / closing operation instruction to each of the switches on the power transmission route selected by the power transmission loss determination unit. 2. When the transmission loss of the transmission route selected by the switch operating procedure creating means exceeds a preset allowable value, a notification means is provided to output that effect. Distribution system operation device.