JPH061945B2 - Distribution system operating device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an operating device of a power distribution system, and in particular, when performing flexible power transmission from a healthy distribution line in an arbitrary power outage area or a planned power outage area, etc. The present invention relates to an operating device of a power distribution system in which an overload is prevented from occurring on a power distribution line on the side.

[Technical background of the invention]

A conventional device of this type will be described with reference to FIG. In Fig. 4, SS is a distribution substation, which is usually a transformer T.
The distribution line F is led from the bus BUS through the feeder (distribution line) breaker CB. This distribution line F is divided into distribution sections k ₁ , k ₂ ,
It is divided into k ₃ , ... and is connected to other distribution lines. ・ CT is an AC device for detecting the feeder current (current of the distribution line outlet), CM is the feeder current. It is a measuring instrument. The output signals of the current measuring device and the ON / OFF state signals of the switches such as the feeder breaker CB and the classification switch SW are the teleconverter slave stations TC ₁ , TC ₂ , TC ₃ ... Which constitute the signal transmission device, and the teleconverter master station. It is input to the monitoring panel KB and the interchange power transmission operating unit CONT in the control center via the station TC ₀ . The monitoring board KB is the switchgear state at the present time of the distribution system,
The feeder current and the like are displayed, and the interchange power transmission operation unit (which is composed of a digital arithmetic processing device such as an electronic computer) CONT stores the online information obtained from the signal transmission device in its memory part, and each power distribution section such as k. _The section load current values scheduled for every ₁ , k ₂ , k ₃ , ... Are stored. The section load current can also be taken in as online information via the signal transmission device.

The function of the flexible power transmission operation device CONT is information stored in advance and online information when an accident occurs in the power distribution system, when an overload is detected, and when a work power failure is performed based on the operator's instruction. The calculation for flexible power transmission (hereinafter referred to as flexible calculation) is performed from the above, and the calculation result is sent as a control signal to the switch via the signal transmission device. The Desk is a console for the operator to operate.

By the way, the accommodation calculation is one or more power outage sections which are given constraint conditions and the state of the distribution system (information indicating the connection between the section switch and the section, that is, the section switches connected to both ends of the distribution section. Based on the information on which is the start end and which is the end, the switching status signal of the switch, the current of the transformer and the distribution line, and the load current of each distribution section) This is a calculation for obtaining the optimum switch operating procedure (optimum solution) that matches the objective function for the power transmission in a flexible manner for the power failure section group that is the target of. The objective function means, for example, minimizing supply disruption, averaging reserve capacity of each distribution line after interchange power transmission, and the like.

The function (accommodation calculation) of the conventional interchange power transmission operation unit CONT will be described with reference to the distribution system diagram. FIG. 5 shows a state at the time of soundness, and K ₁ , K ₂ , and K ₃ are notable distribution section groups that will later become power failure section groups. SS ₁ , SS ₂ , SS ₃ … SS _x is a distribution substation, and the distribution lines F ₁ , F ₂ , F ₃ … F _x are derived through feeder breakers CB ₁ , CB ₂ , CB ₃ … CB _x. is doing. The remarkable distribution section groups K ₁ , K ₂ , K ₃ are all transmitted from the distribution line F _x, and the reserve capacity of the distribution lines F ₁ , F ₂ , F ₃ adjacent to these distribution section groups is F ₁ respectively. : 50 (a), F _2: 60 [a], F _3: assume that the 10 [a]. It should be noted that the switch symbols in the figure are indicated by black circles in the on state, and those indicated by white circles are in the off state.

In the state of this FIG. 5, Toka accident occurs in the distribution section group K _x of the distribution line F _x, or distribution line F _x becomes overloaded, it is not possible to power the section group K ₁ ~K _3, Closer SW _x
When the power is turned off, it is assumed that all the power distribution sections K _{1 to} K ₃ are out of power as shown in FIG.

Interchange power transmitting operating unit CONT blackout section group K ₁ ~K ₃ sections load magnitude (K _1: 30 (A), K _2: 20 [A], K _3: 10 [A]), these distribution segments, reserve distribution lines adjacent to (F _1: 50
(A), F _2: 60 [A], F _3: 10 [A]), occluder SW ₁ to SW _3, SW
₄ ~ It is a translation calculation based on the state signal of SW ₆ ,
In the conventional interchange calculation, without changing the system configuration of the distribution line adjacent to the power failure section group, it calculates whether or not there is reserve power by transmitting the interchange power with the current system configuration and if there is reserve power. Power was exchanged from the judged healthy wiring line to the blackout section.

This flexible calculation will be described below using a table. First,
When starting the calculation of accommodation to the power failure sections K _{1 to} K ₃ , all the switches SW _{1 to} SW ₆ that can be directly connected to the power failure section groups K _{1 to} K ₃ are virtually turned off.

Next, the blackout section groups K _{1 to} K ₃ are arranged in ascending order of section load (Table 1).

Then, assuming that the distribution lines F _{1 to} F ₃ ignore the connection state between the actual distribution sections and transmit the power to the blackout section groups K _{1 to} K _{3 using} only the size of the section load as a determination factor, Determine how many sections the distribution lines F _{1 to} F ₃ can transmit. The results of this judgment are shown in Table 2.

Then, the given number of blackout sections is α (α = 3 in this case)
Then, a combination of the number of transmission sections ai of each distribution line is obtained using the formula α ≧ a ₁ + a ₂ + a ₃ = Σai, and this is shown in Table 3.

However, 0 ≤ a ₁ ≤ a ₁ max 0 ≤ a ₂ ≤ a ₂ max 0 ≤ a ₃ ≤ a ₃ max From Table 3, for each combination case of a ₁ , a ₂ , and a ₃ , the constraint conditions on the system connection and the total load of the sections to be accommodated do not exceed the reserve capacity of the interchange side distribution lines F _{1 to} F _3. The flexible section is determined by the range. This determined combination of the interchange sections is shown as a pattern (Table 4).

In addition, in Table 4, as
Since one section K ₁ ~K ₃ is not a practical solution when it is flexible transmission simultaneously from two distribution lines, * exclude this mark the subsequent calculation.

Next, each pattern has an objective function (for example, minimizing supply disruption,
The evaluation of whether they meet the minimization) of Hitoshitaira degree K _p of reserve capacity of each distribution line after interchange. The indexes for evaluation are shown in Table 5. The uniformity K _p is calculated by the following equation.

Here, Fi _YB is the reserve capacity after the flexible transmission of the distribution line i.

As can be seen from Table 5, when the minimum supply disruption of the two objective functions is the first-priority objective function and the average degree K _p is the second-rank objective function, the pattern is the optimum solution.

More in flexibility calculations Te also DOO stamen, reserve after interchange power transmission each F _1: 20 (A), F _2: 30 [A], F _3: As will be 10 [A], switch SW _The interchange power transmission operator CONT outputs an operation command to the switch via the signal transmission device so that ₃ , SW ₄ and switch SW ₅ are turned on. The system configuration diagram at this time is as shown in FIG. 7, in which the distribution section K ₁ is interchanged with the distribution line F ₁ , and K ₂ and K ₃ are interchanged with the distribution line F ₂ .

Although the example of FIG. 5 is an extremely simple distribution system,
As described above, there are 17 patterns to be evaluated. When trying to find the optimum solution in an actual system, it is necessary to evaluate hundreds of thousands to millions of patterns due to the complicated distribution system, and it is impossible for the operator to perform this evaluation. Storing all 100,000 to several million patterns in memory is not practical because it increases the memory capacity. In reality, each time a pattern is generated, the smaller the degree of uniformity compared with the previously described solution. I try to leave the pattern.

BACKGROUND problems ART In the above description of the flexible calculation results, but when the power failure section K ₁ ~K ₃ can interchange power from all other sound distribution lines, the result of the flexibility calculation, that a portion It may be inflexible. This case will be described below.

For example, the size of the load in section K _{1 to} K ₃ does not change, and the distribution line
The reserve of F _{1 to} F ₃ is F ₁ : 20 [A], F ₂ : 25 [A], F ₃ : 10
Suppose it was [A]. If the calculation is performed based on the flexible calculation algorithm described above, the pattern in which the switches SW ₅ and SW ₆ are turned on and the switches SW ₁ , SW ₂ and SW ₄ are turned off is the best solution. As a result, as shown in FIG. 8, the sections K ₂ and K ₃ are transmitted through the distribution lines F ₂ and F ₃ , respectively, but the section K ₁ becomes an incompatibility section.

The conventional flexible power transmission operation unit CONT has a configuration in which when it is recognized that the section K ₁ cannot be accommodated, it is displayed on the monitor panel KB or an alarm is issued to notify the operator of that fact.

[Object of the Invention]

The present invention, when there is insufficient reserve capacity in a healthy distribution line that is in contact with a concession section such as a power failure section, as described above, rather than simply notifying the operator and terminating the accommodation operation process,
When a part of the load of a healthy distribution line is switched and connected to another healthy distribution line, the interchange calculation is performed again to determine whether or not flexible transmission from the distribution line with a large reserve capacity to the conserved section can be performed. Accordingly, it is an object of the present invention to provide an operating device of a power distribution system in which the occurrence of an inflexible section is reduced.

[Outline of Invention]

In order to achieve the above object, the present invention provides a load current of a distribution line,
Connection information of distribution section, ON / OFF status signal of switch,
If the concession calculation is performed for the concession section using the current of each section load, and if there is an unacceptable section as a result, the unacceptable section and all sections of the distribution line adjacent to it are virtually cut off. It is intended to obtain an operating device of a power distribution system in which a so-called multi-stage switching operation is performed by performing a flexible calculation.

Example of Invention

The present invention further carries out the following operation following the result of the flexible calculation shown in FIG. According to the algorithm of the above-mentioned accommodation calculation, first, all of the section groups K ₄ , K ₅ , K ₆ being transmitted from the distribution line F ₁ adjacent to the power failure section group K ₁ are virtually shut down, and these power failure section groups are arranged in ascending order. Align (Table 6).

And each distribution line as in the case of the accommodation calculation above
F ₁ .F ₂ and F ₅ ignore the actual interconnection of the intervals,
Assuming that power is transmitted only by considering the size of the section load, it is determined how many sections each distribution line F ₁ , F ₄ , F ₅ can transmit. The results of this judgment are summarized in Table 7.

In Table 7, the reserve of F ₁ is 10 from the initial 20 [A].
The reason why it became 0 [A] was that the power reserve was 20 [A] + K ₄ (30A) + K ₅ (30A) + K ₆ (20A) = 1 because F ₁ was completely cut off (virtually).
This is because it became 00A. Let α (= 4) be the total number of power outages given in Table 7, and α ≧ a ₁ + a ₄ + a ₅ = Σai a ₁ , a ₄ ,
a Find all the combinations of ₅ . This is shown in Table 8.

However, O ≤ a ₁ ≤ a ₁ max O ≤ a ₄ ≤ a ₄ max O ≤ a ₅ ≤ a ₅ max For each case of a ₁ , a ₄ , and a _{5 in} Table 8 above, the constraint condition on the system connection and the total load of the interchange section are
The interchange section (pattern) is determined within a range that does not exceed the reserve capacity of the interchange side distribution line. The results of this pattern division are shown in Table 9.

In Table 9, the mark * is a pattern to be removed as in the above description, and in Cases 9 to 12, there is no pattern because the reserve capacity of F ₅ is insufficient.

From the results of Table 9, it is evaluated whether or not each of the patterns 1 to 3 meets the objective function of minimizing the supply hindrance and minimizing the flatness K _p of the reserve capacity of the distribution line after the interchange. The indicators for this evaluation are shown in Table 10.

The result pattern in Table 10 is the optimal solution when the minimum supply hindrance is the first priority objective function. Flexible power transmission controller CONT
Based on this optimum solution, will output an operation command to the switch via the signal transmission device to turn on switch SW ₄ , turn on SW _7, and turn off SW ₈ .

As a result of this accommodation operation, the distribution section K ₆ that the healthy distribution line F ₁ was transmitting was disconnected, and was connected to another healthy distribution line F ₄ , and instead it was impossible to accommodate with the conventional accommodation operation. Section K ₁
Is transmitted from the distribution line F ₁ side. The system configuration after this accommodation operation is as shown in FIG.

Note that, as described above, connecting a part of a section of a healthy distribution line to another distribution line and performing flexible power transmission to a section where there is no flexibility is called a multi-stage flexible operation.

FIG. 1 is a diagram showing an operation flow of an interchange power transmission operating device CONT according to the present invention. First, it starts when a system accident occurs, and switches on / off status signals based on the online status, information about the connection between the switch and the distribution section, reserve capacity of distribution lines, and preset sections. Based on the information such as the size of the load, the accommodation calculation is performed in step ST ₁ (this accommodation calculation is the same as the conventional accommodation calculation.) Step ST
If it is judged that the calculation result of ₁ is compatible with step ST ₂ ,
The result is output as an optimum solution, and based on this solution, an operation signal is sent to the switch via the signal transmission device.

However, if an incompatibility section such as K ₁ occurs in part of the determination result in step ST ₂ , incompatibility section K ₁ in step ST ₃
The distribution lines F ₁ , F ₄ and F ₅ adjacent to are obtained, and the number i thereof is obtained. In the case of this embodiment, i = 3. Then step ST ₄
In the incompatibility section K ₁ and distribution lines F ₁ , F ₄ ,
Find the number Z of all combinations of F ₅ . In this case Z =
2i-1 = 7.

The case of each combination represented by _{j, j = 1 (ST 5} ) as from the step ST _6, the total distribution leg that power from the power distribution line determined by flexible non segments and j th combination and virtually blackout period , Store this in memory. In step ST ₇ , the flexible calculation is performed based on the stored value of this memory. The result of this flexibility calculation, when it is determined that there is no flexibility impossible interval in step ST _8, are as defined above for switch is operated by the output the solution as the optimal solution. If an inaccessible section occurs in step ST ₈ above, maximum J =
The calculation up to step ST ₈ is repeated up to the number of times z. j =
If the incompatibility section occurs even after repeating the operations from ST ₆ to ST ₈ up to the number of times z (7 times in this embodiment), the inevitable accommodation is output as the solution. FIGS. 2 (A) and 2 (B) respectively show distribution lines F ₁ , F ₄ , F ₅ and K adjacent to K ₁ when an incompatibility section K ₁ is generated as a result of the calculation in step ST ₂ of FIG. FIG. ₃ is a diagram schematically showing a relationship with ₁ (corresponding to step ST ₃ ) and a case showing a combination of F ₁ , F ₄ , F ₅ and K _{1 in} step ST ₄ .

Although the above description is about the flexible operation when an accident occurs in the power distribution system, the present invention is not limited to only this embodiment, when the power distribution section of the distribution line with an operator causes a work power failure, or It can also be applied when the distribution line is overloaded. In the former case, CONT should have a function to judge the concession section based on the work power outage command from the operator, and in the latter case, the function to detect the overload automatically and the section to be separated. Should have both.

〔The invention's effect〕

As described above, according to the present invention, by performing a multi-stage accommodation operation on a section that cannot be accommodated only by the conventional accommodation operation, it is possible to perform accommodation power transmission to the section that cannot accommodate the accommodation, and the accommodation becomes impossible. The interval can be minimized.

[Brief description of drawings]

FIG. 1 is a flow chart showing a procedure of a flexible operation of a distribution system according to the present invention, and FIGS. 2 (A) and 2 (B) are schematic diagrams for explaining a combination of a non-flexible section group and wiring adjacent thereto. And FIG. 3 is a diagram showing a combination order, FIG. 3 is a system configuration diagram after an interchange operation according to the present invention, FIG. 4 is a system conceptual diagram of a distribution system operating device according to the related art and the present invention, and FIG. Figures and 6 are system configuration diagrams during power failure, 7
FIG. 8 and FIG. 8 are system configuration diagrams when the flexible transmission is successful and when the flexible non-interval occurs. F _{1 to} F ₅ , F _x … Distribution line K _{1 to} K ₆ … Distribution section TC ₀ , TC _{1 to} TC ₃ … Signal transmission device KB… Monitoring board CONT… Interchangeable transmission operator Desk… Operating console

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Suzuki 1st in Toshiba Fuchu, Tokyo Fuchu-shi, Toshiba Fuchu factory (72) Inventor Osamu Saito 1st in Toshiba Fuchu, Tokyo Fuchu-shi, Ltd.

Claims (3)

[Claims] 1. A switching status signal of a feeder circuit breaker of a distribution system, a switching status signal of a classification switch that divides a distribution line into a plurality of sections, and connects distribution lines to each other, a load current signal of each distribution line, Section load current signals that have been set or acquired online, and connection information indicating how the distribution sections are connected to each other are used.When an accident occurs in the distribution section, detection of an accident occurrence, detection of an accident section, and In the operating device of the power distribution system, which determines the concession section and performs the concession transmission from the other distribution line to the concession section, performs the concession transmission from the other healthy distribution line to the concession section. In this case, if the distribution line on the accommodating side becomes overloaded as a result of the accommodating calculation and the accommodating power transmission becomes impossible, the distribution line on the accommodating side is tentatively put into a power failure state and An operating device for a power distribution system, which performs an accommodation calculation for a section including a section to be accommodated that cannot be accommodated and operates the distribution switch based on a result of the accommodation calculation. 2. An open / closed state signal of a feeder circuit breaker of a distribution system, an open / closed state signal of a divisional switch which divides a distribution line into a plurality of sections, and which connects the distribution lines to each other, a load current signal of each distribution line, in advance. If a section power current signal that has been set or acquired online and connection information that indicates how the distribution sections are connected to each other is used to cause a work power outage in any power distribution section, the work power outage command must be followed. In the operation device of the power distribution system, which determines the concession section, and performs concession transmission from this other section to the concession section, performs converging electricity from the other healthy distribution line to the concession section. In this case, as a result of the accommodation calculation, when the distribution line on the accommodation side becomes overloaded and the interchange power transmission becomes impossible, the distribution line on the accommodation side is virtually put into a power failure state, and the virtual power failure section and the accommodation failure An operating device for a power distribution system, which performs an accommodation calculation for a section including an effective accommodation section and operates the section switch based on a result of the accommodation calculation. 3. A switching status signal of a feeder circuit breaker of a distribution system, a switching status signal of a divisional switch that divides a distribution line into a plurality of sections, and connects the distribution lines to each other, a load current signal of each distribution current, in advance. If an overload occurs on the distribution line using the section load current signal that has been set or acquired online, and connection information that indicates how the distribution sections are connected to each other, it should be detected and disconnected. In the operation device of the power distribution system, which determines the concession section and performs the concession transmission from the other distribution line to the concession section, the concession transmission from the other healthy distribution line to the concession section. When performing, when the distribution line on the interchange side becomes overloaded as a result of the interchange calculation and interchange power transmission becomes impossible, the distribution line on the interchange side is virtually put into a power failure state, and this virtual power failure section and the interchange Impossible An operating device for a power distribution system, which performs an accommodation calculation for a section including a section to be accommodated, and operates the segment switch based on a result of the accommodation calculation.