JP3103711B2 - Method of creating load transfer procedure when distribution bank is stopped and load transfer control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preparing a load transfer procedure when a transformer of a distribution substation is stopped due to a check or the like, and a load transfer control device.

[0002]

2. Description of the Related Art A conventional automatic distribution line switching method for transferring a load when a transformer is stopped in a distribution substation will be described with reference to FIGS. FIG. 2 shows distribution substations 1 and 2 and their distribution systems 11,
12 is a diagram showing a broader distribution system consisting of 12 units. Substation 1
Has two transformers 11B and 12B, and the substation 2 has one transformer 21B. Usually, one substation has 3
Many have two transformers. Therefore, FIG. 2 is for convenience of explanation only. Further, each transformer of the substation is called a bank, so substation 1 has two banks # B-
1 and # B-2, and the substation 2 is an example having one bank # B-1.

[0003] In both substations 1 and 2, primary buses 1A and 2A from the transmission line, and secondary buses 1B and 1C to the distribution system side.
2B, the transformer 11B is connected to the buses 1A and 1B via circuit breakers 111 and 112, and the transformer 12B is connected to the buses 1A and 1C via circuit breakers 121 and 122,
The transformer 21B is connected to the bus 2 via the circuit breakers 211 and 212.
A, 2B. In Substation 1, Bank #B
-1 and # B-2 are connected via a circuit breaker 113.

[0004] Substation # 1 has buses 1B and 1B.
C to three circuit breakers (F111, F112, F
113) and (F121, F122, F123) to the distribution line system 11. Substation 2 Bank #
B-1 is also a circuit breaker (F211, F212,
F213) to the distribution system 12.

[0005] The power distribution system 11 includes circuit breakers F111 to F1.
It has lines L _{1 to} L ₆ that receive power distribution via 23. Lines L _{1 to} L ₆ are line section switches 111-1 to 111-12, respectively.
It is divided into 3-3, and supplies power to distribution lines. Distribution system 12 likewise has three line L ₇ ~L ₉ and the line segment for switch 211-1～213-3.

In such a system example, when the transformer 12B of the substation 1 is stopped due to a check or the like, the circuit breakers F121 to F12 for supplying power from the transformer are provided.
3 and the load section of the lower distribution system, ie, the switch 12
1-1 to 121-3, 122-1 to 122-3, 123
It is necessary to shift the load so that a load is supplied from another power distribution system to a load section divided and divided by -1 to 123-3.

[0007] For load transfer, a method of passing extra power from the distribution system belonging to the transformer 11B, and a method of passing extra power from the distribution line system belonging to the transformer 21B belonging to another substation. There is. In order to transfer the load, respective distribution system linkage switches (T11 to T16 in FIG. 2) are provided between the respective distribution systems, but are omitted in FIG. 1 for simplification of the drawing.

In the conventional load transfer control device, a load transfer procedure is obtained by load accommodation calculation. The load transfer procedure based on the load interchange calculation indicates the selection of the above-mentioned distribution system linking switch and the switching procedure thereof. A method of obtaining a load transfer procedure based on the load accommodation calculation and an example of load transfer switching will be described below.

First, the first switch 1 is connected to the distribution line breakers F121 to F123 belonging to the transformer to be stopped 12B.
By temporarily turning off the power supply of the load-side section by performing a load interchange calculation by temporarily turning off the power supply of the load side section, the entire distribution receiving the power supply from the transformer 12B is performed. Find a procedure to switch the full load section of the electric wire to another system. When a switching procedure is required, a system switching operation is performed according to the switching procedure, and then the circuit breakers F121 and F122 of the transformer 12B are opened to put the transformer in a stopped state. FIG. 2 shows an example of a state after the system is switched by this method. Note that when switching back the system, switching back is basically performed in the reverse operation order of switching. FIG. 2 shows an example of the same system as that of FIG. 1, and the same reference numerals are used, and the distribution system-related switches T11 to T16, which are omitted in FIG. 1 for simplifying the drawing, are added. . FIG.
, The distribution line breaker F1 belonging to the transformer 12B
21, F122 and F123, the load section of the distribution system receiving the power supply is connected to the distribution system linkage switches T11 to T11.
The state where the load is shifted and the power failure is avoided by setting T16 to the closed state is shown. Here, it is assumed that considering that the transformer and the distribution line, which are the power supply source, are not overloaded after the load transfer, it is considered as a part of the load interchange calculation function. Condition. Further, all of the switches T11 to T16 are turned on, but this is determined by the calculation of the load distribution, and is originally arbitrary.

[0010]

When the load of the stop transformer is transferred by such a method, the larger the number of distribution lines and the distribution system belonging to the stop transformer, the larger the number of combinations of the ON / OFF state of the switch. , The processing efficiency is likely to be reduced, and the number of switching operations is increased.

An object of the present invention is to provide a load transfer procedure creating method and a load transfer control device which enable switching and switching back of a power distribution system with a small number of operation procedures without disrupting the standard operation form of the power distribution system. is there.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a method for preparing a load transfer procedure for stopping a bank-divided transformer of a distribution substation, wherein a load transfer destination of the stopped transformer is in the same substation. At least one of the bus turning designation, which is the designation of the destination transformer by turning on the bus linkage breaker, and the distribution line turning designation, which is the designation of the switching load through the distribution line switch. A load transfer procedure shall be created according to the specified contents.

Further, according to the present invention, the designation of the bus turning and the distribution line turning are performed by the control center, and the load transfer procedure based on the designation is performed by the sales office in charge of the power distribution. It shall be.

Further, according to the present invention, in preparing the above-mentioned load transfer procedure, it is checked whether or not a bus rotation is designated, and whether or not a distribution line is designated. If there is a bus rotation designation, the procedure for load distribution by the bus rotation designation is performed. Was determined first, and then a procedure for load distribution of the distribution line was determined.

Further, the present invention provides a plurality of substations divided into banks for each transformer, a bus link breaker for connecting adjacent banks to each other on the secondary side of the transformer, A distribution line provided on the secondary side of a transformer, a line section switch for opening and closing each distribution line section, and a linking switch for linking between distribution lines; Prior to the shutdown of the transformer that was stopped, as the transfer destination of the transformer to be stopped, through the bus rotation designation, which is the designation of the destination transformer by turning on the bus link breaker in the same substation, and via the switch of the distribution line A setting means for setting the distribution line routing designation, which is the designation of all the switching load amounts, at the control station side, and a load transfer procedure is created according to the setting contents. It comprises a creating means provided on the business office side, and a control means for selectively turning on the bus-link breaker, the line section switch and the link switch according to the load transfer procedure.

The present invention further provides a plurality of substations divided into banks for each transformer, a bus link breaker for connecting adjacent banks to each other on the secondary side of the transformer, for each substation, A distribution line provided on the secondary side of a transformer, a line section switch for opening and closing each distribution line section, and a linking switch for linking between distribution lines; Prior to the shutdown of the transformer that was stopped, as the transfer destination of the transformer to be stopped, through the bus rotation designation, which is the designation of the destination transformer by turning on the bus link breaker in the same substation, and via the switch of the distribution line The control center sets the distribution line rotation designation, which is the specification of the switching load amount, and checks whether the bus rotation designation is specified according to the setting contents and the distribution line rotation designation, and if there is a bus rotation designation, Procedure for load distribution by this bus turning designation Creates a load transfer procedure by asking for priority, and then preparing a procedure for load distribution of distribution line routing, and a creation means provided by the sales office, and a corresponding link in the bus turning designation according to this load transfer procedure When the breaker is turned on, the bus turning load shift control is performed. When the distribution line turning is specified, the corresponding line section switch and the associated switch are turned on to perform the distribution line turning load shift control. And control means.

Further, in the present invention, the closing control of the link breaker in the bus turning is performed from the control center, and the closing control of the line segment switch and the link switch in the distribution line turning 1 is performed from the business office. .

[0018]

According to the present invention, it is possible to specify not only a stop transformer but also a bus turn and a distribution line turn, thereby simplifying a load transfer procedure.

Further, load transfer control according to such a load transfer procedure is achieved.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to shift the load when a transformer in a substation is stopped, it is necessary to consider the business division in the electric power company. The control of the substations is performed by the control station, and the control of the distribution system is performed by each sales office. FIG. 4 shows this as a system diagram. On the control station side, there is a monitoring and control device 20, which monitors and controls the substation as well as the power transmission system. Each sales office (A, B,
On the C) side, there are monitoring control devices 21, 22,..., 23 for monitoring and controlling the distribution system in charge, respectively. The control-station-side monitoring and control device 20 sends to the monitoring and control device (for example, 21) of the business office to which the stopping transformer belongs to the effect that the transformer is to be stopped, the transformer number, whether or not the bus can be turned, and whether or not the bus can be turned. The bus number of the turning destination, the possibility of turning the distribution line, and the instruction of turning the distribution line are set and sent. Upon receiving this, the monitoring control device 21 creates a switching operation procedure, and switches the load distribution according to the created procedure.

FIG. 5 shows the overall processing flow of the control office and the business office. On the control station side, a transformer stop plan is created (step S1), and prior to the stop work, the bus is turned and the transfer destination bank is specified and the transfer amount is set (step S2). , Or may be wireless) to the supervisory control device 21 of the office in charge (step S3). The monitoring control device 21 receives this (step S4), creates a switching operation procedure (step S5), and further performs switching control for load distribution according to the procedure (step S6). Means that the bus-coupling circuit breaker 113 is closed, but this closing control often belongs to the control center side as work sharing. In such a case, the closing control of the bus bar circuit breaker 113 by the bus turning is not performed from the business office side, but the load shifting control for the distribution line turning is performed on the business office side.

In the example shown in FIG. 2, the sales office refers to a department in charge of the two distribution systems 11 and 12 from the two substations 1 and 2. In this office, one monitoring and control device (for example, 21) is provided to perform load distribution and transition control. The extent to which one sales office has control over the distribution system is arbitrary, and is determined by regional and power policies.

Here, the bus turning destination bank designation (specifying the bus turning designation) set on the control center side is a transition when performing a load shift by turning on a link breaker between the secondary buses of the transformer. The designation of whether or not the pre-transformer is specified. For example, according to the system of FIG. 2, the linked breaker between the secondary buses is the breaker 113, and the destination transformer is the transformer 11B. Further, in FIG. 2, there is no such thing as the link breaker 113 at the substation level between the substations 1 and 2, and the link switches T12, T13, T16 between the distribution systems as shown in FIG. , Only the distribution systems 11 and 12 are connected. Therefore, in the configuration as shown in FIG. 2, # B-1 → # B-2 or # B-2 inside the substation 1 side.
It can be said that only the bus turning from B-2 to # B-1 can be designated.

Further, the setting of the shift amount of the distribution substation turning (designation of the distribution line turning) is the setting of the load amount for performing the load shift by operating the line segment switch of the distribution system or the linked switch between the distribution systems. The designation of presence or absence. In the example of FIG. 2,
Line section switches are 111-1 to 111-3 to 12
3-1 to 123-3, and the linked switch between the distribution systems is T11 to T16 in the example of FIG.

When the transformer of the distribution substation stops, the above 2
A system switching procedure is determined in accordance with the state of the presence / absence of the setting of the type of information. FIG. In FIG. 1, a block a is a block for judging the presence / absence of designation of a transfer destination bank. When there is designation, a block b is shown.

Block b is a block for judging whether or not the shift amount of the distribution line is set.
Shows a determination function for shifting to the function of the block d when there is no designation. Block c is a block for determining whether or not the same amount of transition of the distribution line routing as block b is set. When there is a designation, the process proceeds to block h, and when not designated, the process proceeds to block g. Block d determines the distribution line to switch the distribution line unit according to the reserve power of the bus rotation destination bank when the migration destination bank of the bus rotation is specified and the transition amount of the distribution line rotation is not set. It is determined by the following procedure in the block. (1) To determine the reserve capacity of the transfer destination bank. (Reserve capacity) = (capacity of equipment) − (current load or predicted load of the destination bank). (2) A combination of distribution lines connected to the secondary side of the stop transformer and the sum of the distribution line load for each combination is determined. (3) Other than the reserve power obtained in (1), the combination of the distribution lines having the largest sum obtained in (2) is determined, and the distribution line is determined as the switching distribution line by bus turning, and the other distribution lines are It is determined as a switching distribution line by turning the distribution line.

FIG. 6 shows an example of the determination of (1) to (3). In FIG. 6, when 1B is a stop transformer (the reverse of FIG. 2 but the concept is the same) and 2B is bus-turned and designated as a destination bank, the reserve capacity of the transformer 2B is 200-145 = 55A. (Here, it is assumed that if the installed capacity of the transformer 2B is 200A, the current use current is 145A). On the other hand, distribution line breakers F11 and F1 connected to the stop transformer 1B
2, assuming that the current capacity of F13 is 10A, 20A, and 30A, there are seven combinations of these three combinations shown in FIG. 6, and the sum of distribution line currents for each combination is shown in the total current column for each combination. Value. At this time, the combination of the circuit breakers F12 and F13 of the distribution line having the largest sum of the total currents other than the reserve power of the transformer 2B is determined as the distribution line to be collectively switched by bus turning. Returning to FIG. 1, block e is a block for determining whether or not the switching distribution line has been extracted by turning the bush. If not extracted, the process proceeds to block g, and if it is extracted, the process proceeds to the function of block f. It is a decision block.

Block f is a block for performing a load interchange calculation on a load section of a distribution line that was not subject to bus turning by block d and for determining a switching procedure. The efficiency is improved and the number of required procedures can be minimized. Further, when all the distribution lines belonging to the stop transformer can be switched by turning the bus, the switching can be performed without changing the operation mode of the distribution system before the switching.

Block g is a functional block in which there is no designation of a bus destination switchover destination bank and no setting of a shift amount of the distribution line rotation. This is a functional block for obtaining the switching procedure, and corresponds to the case where the switching procedure is obtained by the method described in the related art. Block h is a block for obtaining a load to be switched in the case where there is no bus transfer destination bank designation and the transfer load for distribution line feed is set, and is determined by the following procedure. (1) A combination of distribution lines connected to the secondary side of the stop transformer and the sum of the distribution line load for each combination is determined. (2) The distribution line of the union whose current sum obtained in (1) is equal to or greater than the set value as the distribution line rotation and which is closest to the set value is determined as the distribution line to be switched by the distribution line rotation, and the other distribution lines are determined. Is determined as a switching distribution line by bus turning. FIG. 7 shows an example of determination of (1) and (2). In FIG. 7, the transformer 1B is a stopped transformer, and a load section corresponding to 100A or more out of 100A out of the total load 180A of the distribution lines F11, F12, and F13 that receives power supply from the transformer 1B is loaded to other distribution lines. This is an example showing that if the shift can be made, the remaining load can be switched by turning the bus, and among the combinations of the respective distribution lines, the combination of the distribution lines F11 and F12 is a combination that meets the above condition (2). .

Returning to FIG. 1, a block i is a block for performing a load interchange calculation on a load section of the distribution line extracted by the block h to determine a switching procedure. The number can be minimized. Blocks f and i specify the distribution line to be switched,
This is the same functional block in that load accommodation calculation is performed.

Block j is a functional block when there is both a bus transfer destination bank designation and a distribution line transfer shift amount setting, and determines a distribution line to be switched in the following procedure. (1) A distribution line to be switched for distribution line routing is determined. (2) The distribution line determined in the above (1) is excluded or the remaining distribution lines are bus-turned to determine the distribution line to be switched. (3) All distribution lines not selected in the above (1) and (2) are determined as distribution lines to be switched for distribution line routing. FIG. 8 shows an example of determination of (1) to (3). In FIG. 8, the transformer 1B is a stop transformer, the transformer 2B is bus-turned, and is designated as a transfer destination transformer, and the distribution line turning load shift amount is 60A.
This is an example when the above is set.

First, the distribution line is switched by the same means as that described with reference to FIG. 1 and F12 is selected.
An example is shown in which the distribution lines subject to bus turning are determined for the remaining F11 and F13 by the same means as the means described with reference to FIG.

As described above in connection with the embodiment using FIG. 1, by specifying the bus transfer destination bank or by externally setting the amount of the transfer of the distribution line, the distribution switch and the line switch are separated. It is possible to limit the target distribution line for system switching using the switch, thereby improving the processability of the load interchange calculation for the load transfer and the effect of reducing the number of switching procedures. In this embodiment, three distribution lines are used for one transformer. However, in general, there are three distribution transformers and ten distribution lines / transformers per distribution substation. The effect of the invention is remarkable.

FIG. 9 is a diagram showing the relationship between the control office and the business office according to FIG. The form 1 is an example of designating only a bushing. The control station drafts a transformer inspection plan, designates a stop transformer and designates a transfer transformer to supply a load to a distribution system equivalent to the transformer in accordance with the plan. I do. The designated bushing designation is sent to the business office, and the business office decides the bushing distribution station and prepares a procedure for switching other distribution lines. This result is sent to the control center, and the control center turns on the bus bar circuit breaker and informs the business office of the load transfer procedure. The sales office operates the switch in charge of itself according to the load transfer procedure.

The form 2 is an example in which designation of the bus turning and the distribution line turning are performed from the control station side, and the form 3 has no bus turning designation and designates only the stop transformer in the same manner as in the related art. This is an example where the load distribution is determined on the part side. Details of modes 2 and 3 are omitted.

[0036]

As described above, according to the present invention, when the load section of the distribution system is switched due to the stoppage of the transformer, there are two types, namely, the bus transfer destination bank designation from outside and the load transfer amount of the distribution line turn. By providing the information, a switching procedure in which the switching target distribution line is specified is required, so that an effect of improving the processability and reducing the number of switching procedures can be obtained. Further, since the system switching procedure is basically the reverse procedure of the switching procedure, it is possible to expect to double the effect obtained at the time of switching. On the other hand, when there is no external setting information, the technical level equivalent to the conventional technique can be maintained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a switching procedure creation processing flowchart of the present invention.

FIG. 2 is a diagram showing a substation and a distribution system.

FIG. 3 is an explanatory diagram of distribution system switching when a transformer is stopped.

FIG. 4 is a monitoring control system diagram of a control office and a business office.

FIG. 5 is a diagram showing an overall processing flowchart of a control office side and a business office side of the present invention.

FIG. 6 is a diagram illustrating an example of determining a bus-turn switching distribution line according to the present invention.

FIG. 7 is a diagram illustrating an example of determining a switching distribution line by the distribution line routing of the present invention.

FIG. 8 is a diagram showing an example of determining a switching distribution line when there is a bus-turning switching destination transformer designation and a distribution line turning load shift amount setting of the present invention.

FIG. 9 is a diagram showing a load distribution form and a processing procedure on the control office side and the sales office side of the present invention.

[Explanation of symbols]

 1, 2 Substation 11, 12 Distribution system 11B, 12B, 21B Transformer 1A, 2A Transformer primary bus 1B, 1C, 2B Transformer secondary bus

──────────────────────────────────────────────────続 き Continuing on the front page (73) Patent holder 000006013 Mitsubishi Electric Corporation 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Hiroshi Inoue 5-2-1 Omikacho, Hitachi City, Hitachi, Ibaraki Prefecture, Ltd. Within the Hitachi, Ltd. Omika Plant (72) Inventor Susumu Egawa 3-2-2, Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Inside Kansai Electric Power Co., Inc. (72) Tomoaki Nobukata 3-2-2, Nakanoshima, Kita-ku, Osaka, Osaka No. Kansai Electric Power Co., Inc. (72) Inventor Shigeru Sagae 1-1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Hiroki Kono 1-1-1, Shibaura, Minato-ku, Tokyo (72) Inventor Naoki Masuda 1-1-2, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Pref. Document JP-flat 5-184068 (JP, A) JP Akira 57-71230 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) H02J 3/00 H02J 3/38

Claims (4)

(57) [Claims] In a method for preparing a load transfer procedure for stopping a transformer divided into banks of a distribution substation, a control station side determines a load transfer destination of a transformer to be stopped in the same substation. Designate at least one of bus-running designation, which is the designation of the destination transformer by turning on the busbar circuit breaker, and distribution-line routing, which is the designation of the switching load via the distribution line switch. The sales office of the company checks whether the bus rotation is specified and whether the distribution line is specified, and if there is a bus rotation specified, priority is given to the procedure for load distribution by this bus rotation designation, and then A method for creating a load transfer procedure when a distribution bank is stopped, in which a procedure for load distribution of a turn is determined, and a procedure for load distribution of a distribution line is determined unless a bus turn is specified. 2. A plurality of substations divided into banks for each transformer, a bus link breaker for connecting adjacent banks to each other on the secondary side of the transformer for each substation, and a transformer for each bank. 2
A distribution line provided on the next side, a line section switch for opening and closing each distribution line section, and a link switch for linking between distribution lines,
Prior to the shutdown of the banked transformers in the distribution system consisting of buses, the bus turning, which is the designation of the destination transformer by turning on the bus-interrupting circuit breaker in the same substation, as the load transfer destination of the transformer to be stopped Setting means to set the distribution line designation, which is the designation of the switching load amount via the switch of the distribution line, at the control station side, and the sales staff in charge of distribution who create the load transfer procedure according to the setting contents And a control means for selectively turning on the bus-coupling circuit breaker, the line section switch, and the coordination switch in accordance with the load transfer procedure, and a load transfer control device when the distribution bank is stopped. . 3. A plurality of substations divided into banks for each transformer, a bus link breaker for connecting adjacent banks to each other on the secondary side of the transformer for each substation, and a transformer for each bank. 2
A distribution line provided on the next side, a line section switch for opening and closing each distribution line section, and a link switch for linking between distribution lines,
Prior to the shutdown of the banked transformers in the distribution system consisting of buses, the bus turning, which is the designation of the destination transformer by turning on the bus-interrupting circuit breaker in the same substation, as the load transfer destination of the transformer to be stopped A control means to set the distribution line designation, which is the designation of the switching load amount via the switch of the distribution line, and whether or not the bus rotation is designated according to the setting contents, and the designation of the distribution line rotation Is checked, and if there is a bus turning designation, priority is given to a procedure for load distribution by this bus turning designation, and then a procedure for load distribution of distribution line turning is determined, and a load transfer procedure is created. If there is no turn designation and the distribution line turn is specified, a load transfer procedure is created by seeking the procedure for load distribution of the distribution line turn. According to bus times Control means for turning on the corresponding linked circuit breaker to perform bus turning load shift control by specifying the corresponding circuit breaker, and for specifying distribution line turning, turning on the corresponding line segment switch and linked switch to control the distribution line turning load shift control. And a load transfer control device when the distribution bank is stopped. 4. The switching control of the link breaker in the bus turning is performed from a control center, and the switching control of the line section switch and the link switch in the distribution line turning 1 is performed from a business office. Or 3) a load transfer control device when the distribution bank is stopped.