JPH06189454A - Method for interchanging and allocating load - Google Patents

Abstract

PURPOSE:To shorten the supply outage time without need for the evaluation of all combinations of linkage points in interchanging and allocating a load. CONSTITUTION:The method for interchanging and allocating a load includes an interchange preliminary power updating function 101 to remain prepared for calculation with respect to all the linkage points in a distribution line during normal operation; interchange source extraction function 20 to pick up all linkage points related to groups of power interruption sections from section energization/power interruption on-line data 11 collected at the occurrence of accidents and a node/branch data base with respect to distribution system sections and switch connections; and interruption source numbering function 110 to determine the sequence of cyclic use of interruption sources in the order of the magnitude of preliminary power. The method also includes a branch load selecting function 120 to select one section within the range of its interchange preliminary power if there are a plurality of points of linkage with unallocated power interruption sections as seen from a distribution line already allocated; function 135 to update the preliminary power after allocating interchange preliminary power to the applicable distribution lines; and allocation performing function to repeat allocation according to the sequence of the number until there is no applicable picked up section left.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load interchange allocation method for remotely controlling a section switch for a power failure load section group to obtain a supply form in which reverse power transmission is performed from another healthy distribution line.

[0002]

2. Description of the Related Art A typical conventional method will be described with reference to FIG. When the accident occurs, the section charge / power failure online data 11 and the load section are the trunk, and the distribution system section with the remote control section switch as a branch and the switch connection related nodes
An interchange destination extraction function 10 that extracts all supply interruption power failure sections from the branch database 12, and a switch connection connection node / branch database 12 for connection points that have interconnections in the power failure section group
From the concession source extraction function 20 to select all from, the concession source 21 obtained from 20 and the concession destination 13 obtained from the concession destination extraction function 10 in the concomitant source / contract destination combination generation function 30, all combination cases 31 After obtaining the cases, the combination evaluation function 40 evaluates all cases according to the proposition, and the case with the highest score is calculated by the operation procedure calculation function 50.
When all the operating procedures were requested, the procedure execution function 60 was used to restore the flexibility. Furthermore, when a section where the accommodation becomes impossible remains, the procedure for the accommodation operation for the beading is sought and the accommodation operation is repeated.

[0003]

According to the above-mentioned conventional method, the number of combination cases increases with the exponentiation with (the number of accommodation sources) as the base and (the number of accommodation destinations) as the exponent.
All cases must be evaluated in order to find the optimum accommodation mode. For example, even if the number of concession sources is 3 and the number of concession destinations is at most 20, there are 3.4 billion required evaluation cases,
Often wasted a long time. In addition, if there is an unacceptable section in the obtained optimum accommodation mode, there is no choice but to wait for the accommodation operation for the calculation time of the bead accommodation operation procedure, and there is a problem that a total supply hindrance may occur. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a load accommodation allocation method that does not require evaluation for all combinations and that can shorten the supply trouble time.

[0004]

The load accommodation allocation method according to [Claim 1] of the present invention calculates a reserve force in both directions at an interconnection point between all distribution lines in normal times or at the time of occurrence of an accident, and an accident occurs. From the section charge / power failure online data that is grasped at the time of occurrence and the distribution system section / switch connection connection related node / branch database that has the load section as the trunk and the remote control section switch as the branch, connect to the power failure section group. All interconnection points are selected, and the order of cyclical use is assigned to the interchange source in descending order of reserve capacity.If there is an unassigned power failure section and multiple interconnections as seen from the distribution line that circles, the Within the range of reserve capacity, Rank 1: It is close to the power source before the accident in the section where there is no communication route with others. Rank 2: The load is the largest in the section where there is no communication route with others. Rank 3: The load is the largest in the section where there is a communication route with other parties. Only the section corresponding to the highest selection order is selected, the reserve capacity of the corresponding distribution line is reduced by the allocated load and updated for each selection, and the section is repeated until there is no corresponding section. The load accommodation allocation method according to [claim 2] of the present invention compares the total interconnection reserve capacity with the total accommodation load of the accommodation target section group before sequentially entering the cyclic allocation, and when the former is less than the latter, Recognizing the need for a beading outside the interconnection point, remove the constraint conditions at the time of interconnection allocation and assign it, and execute the external beading operation with the resulting insufficient reserve capacity as the beading target value of the corresponding interchange source distribution line. It is a thing.

The load accommodation allocation method according to [Claim 1] of the present invention uses the substation feeder cutoff / protection relay information transmitted remotely at the time of an accident and the online data based on the status reply information from the classification switch slave station. From the node / branch database of the distribution system, select all interconnection points that have interconnections in the power outage section group. Then, before the load interchange rate is attached, the wheel numbers shall be used for all the selected interconnection points in descending order of the corresponding interconnection reserve prepared by the interconnection reserve preparation function in normal times or during an accident. After the attachment and load accommodation allocation, the interconnection group in which the reserve capacity remains remains as a target, and the allocation sequence is circulated in the following order every time one allocation is made for each section. Then, this process is repeated until there is no selected applicable section.
The load accommodation allocation method according to claim 2 of the present invention recognizes a shortage of reserve capacity before performing cyclical allocation, and processes it as a beading target value to compensate for this shortage.

[0005]

Embodiments will be described below with reference to the drawings. Figure 1
FIG. 3 is a configuration diagram of an embodiment for explaining a load accommodation allocation method according to the present invention. In FIG. 1, 101 is a flexible reserve updating function, which calculates and prepares reserves in both directions for interconnection points between all distribution lines during normal times. 100 is the current value sent from the substation, 102 is the section load capacity database, 10
3 is distribution line accommodation data, which is the normal processing content as described above. On the other hand, 10 is a consignment destination extraction function, which is used for online data of section charge / power failure (hereinafter,
The concession destination section is extracted by (referred to as online data) 11. 13 is the accommodation group data. Reference numeral 20 is a concatenation destination extraction function, which is online data 11 that is grasped when an accident occurs, and a distribution system section / switch connection connection node / branch database (hereinafter referred to as node / node database) that has a load section as a trunk and a remote control section switch as a branch. From the branch database), select all the interconnection points that have interconnections in the power failure section. 110
Is a flexible source wheel number assigning function, which assigns a cyclic use order to the selected flexible source in descending order of reserve capacity.

Reference numeral 120 denotes a branch load selection function, which selects from the loads in the branch load selection order 125. The order in this case is as follows. That is, when there is an unallocated blackout section and a plurality of interconnections as seen from the distribution line around the wheel number, it is the highest of the following rankings within the range of its own reserve capacity.
Select only the section. Rank 1: It is close to the power source before the accident in the section where there is no communication route with others. Rank 2: The load is the largest in the section where there is no communication route with others. Rank 3: The load is the largest in the section where there is a communication route with other parties. 130 is an allocation execution function, which is repeated according to the wheel number until there is no applicable section. Reference numeral 135 denotes a post-allocation reserve capacity updating function, which reduces the reserve capacity by the load to which the flexible reserve capacity of the corresponding distribution line has been allocated.

Next, the operation will be described. First, by using the reserve capacity update function 101, the load current and passage for each section calculated by proportionally distributing the remotely transmitted substation feeder sending current value 100 with the ratio of the load facility capacity 102 for each section in the database Regarding the current and the point (interconnection point) that can be connected to another distribution line at the end of the distribution line via the normally open section switch, the substation sending transformer, breaker, distribution line, section switch, etc. The interconnection reserve force 103, which is obtained from the difference between the passage allowable current, is updated each time the interconnection point moves during normal times. The interchange source extraction function 20 is used for remote control classification based on the load section as the trunk, the online data 11 grasped from the substation feeder cutoff, protection relay information and the status reply information from the classification switch slave station that are remotely transmitted when an accident occurs. From the node / branch database 12 with switches as branches,
Select all the interconnection points 13 that have interconnections in the power failure section group. The interchange source wheel number assigning function 110 is provided with the corresponding interconnection reserve prepared by the accommodation reserve updating function in normal time for all interconnection points selected by the interchange source extracting function 20 before the load interchange allocation. The wheel numbers are used in the order of increasing force 115, and after the load interchange and attachment, the interconnection group in which reserve capacity remains remains is targeted, and the allocation sequence is circulated according to the following order each time one section is allocated.

A specific example of the power distribution system shown in FIG. 2 will be specifically described. This figure shows a state where the load section groups 1101, 1102, 1103, ..., 1108 are supplied with power through the power breaker 1008. The load section group is divided into four load section groups 1010, ..., 1040 which are supplied from other power sources, through normally open section switches 1211, 1212, 1213, 1214. In this distribution system, an example of the load accommodation allocation method of the present invention will be described in the case where, for example, an accident occurs in the section 1009 and a power failure occurs due to a supply failure on all load sides from the section switch 1007. Here, the white circle symbol of the division switch means an open state and the black circle symbol means a closed state. Further, in the normally open circuit breaker, the white square symbol means the open state and the black square symbol means the closed state. The numerical values shown in parentheses in the figure indicate the load amount of the corresponding section in the section load group, and the conservative reserve value of each distribution line in the vicinity of the normally open section switch.

FIG. 3 is a diagram for explaining the selection process of the branch load selection function. In FIG. 3, ranks 1, 2 and 3 indicate ranks in which the data of the concession sources obtained by the concession source extraction function 20 are arranged in descending order of reserve capacity.
They are arranged in the order of 0 and 1010. As shown in FIG. 2, the reserve powers of the distribution lines 1020 and 1030 are both equal to (70), but in this case, the number of shortest passage sections is small when viewed from the old power supply source 1008 in accordance with the interchange source wheel number assignment rule. Are arranged in order of priority. The allocation determination order means the accommodation destination selection sequence, and the branch load selection function 20 according to the row numbers shown in 1, 2, 3, ...
Find the branch destination at and arrange at the corresponding intersection. The following is a sequential explanation of the applicable rules when selecting array elements that are the result of accommodation selection. As the element 2010, 1106 is the only section with interconnection within the range of the reserve capacity (70) when viewed from the interconnection point 1212 of the distribution line 1020 with the wheel number <1>, so this is selected. After selecting this, the reserve capacity of the corresponding distribution line is reduced by the load amount (40) of the selected section (1106) and updated to (70-40) = (30). Each time a section is selected, the target switch remote operation sequence for transmitting power to the section is obtained and arranged in the operation procedure sequence. From the perspective of reducing the total supply disruption time, each time the operation sequence is arranged,
The corresponding operation can be executed. The same rules are applied to the distribution line of the ring number <2> and the distribution line of the ring number <3>, and the corresponding elements 2020, 2021, 2030, 2031 are arranged. When the wheel turns around, the original order is returned to and the selection of accommodation destination is repeated again.

The fourth allocation determination order (2040) is a flexible source.
Seen from 1020, there are selection candidate sections 1105 and 1102 via normally open division switches 1207 and 1206. In this case, 1102 is applicable when the selection order 2 is applied (the load amount (30) is the maximum within the accommodation reserve capacity (30) of the corresponding distribution line), but 1105 is applicable to the higher selection order 1 ( 1105 is arranged in the corresponding element because the number of passage sections for reaching each section is 1 (minimum as viewed from the old power supply source 1108). Then, the remaining reserve of the distribution line is updated. The element 2050 has a plurality of selection candidate sections 1102 and 1107 as viewed from the concession source 1030, but since only the rule of selection order 3 can be applied to these sections, the section 1102 with the largest load is selected within the range of reserve capacity. To do. The same rules apply for elements 2060 and 2061. Element 2070 is not applicable because there is no unallocated section that is a selection candidate within the range of reserve capacity 10 when viewed from the corresponding distribution line. Therefore, the procedural element 2071 is passed. In this way, the distribution line of the concession source that has not reached the selection candidate is removed from the subsequent wheel number. The same applies when selecting element 2090 as in element 2070. Even when the rotation number is removed from all the source power distribution lines and there is no room for branch load selection, there is still a distribution system in which unallocated sections remain.

FIG. 4 shows this stage. Here, the shaded portion is a section where accommodation has been completed, and section 1103 is an unassignable section where unaccommodated power failure remains. Next, as a method of accommodating to the unallocatable section, a bead accommodation method will be described with reference to FIG. Of the distribution lines that have interconnection as seen from section 1103,
1030 with the maximum remaining reserve is selected as the pool candidate. The distribution line 1030 searches for another interconnection destination distribution line using the load amount corresponding to the insufficient reserve necessary and sufficient for accommodating to the section 1103 as the target value of the stack. The figure shows that the distribution line 1040 was discovered as the tip of the pool and the section 1109 was discovered as the target of the pool. If no pool is possible, it is determined that the section cannot be accommodated. Lines 11 and 12 of FIG. 3 explain the procedure of the above-mentioned beading operation. In the element 2110, the section 1109 collides with the distribution lines 1030 to 1040 via the interconnection point 1109.
At this time, the reserve capacity of distribution line 1040 is the load amount of section 1109 (20)
The number increases to (30), and the conditions for accommodation to the unallocatable section 1103 are satisfied. 2111 and 2121 show the sequence elements of the beading operation.
FIG. 5 shows a load accommodation mode after the beating operation is performed. In addition,
In the embodiment shown in FIG. 1, the accommodation reserve updating function 101 is made to work normally, but the current value 100 and the load equipment capacity 102 are always taken in so that the accommodation reserve updating function is made to work immediately after the accident. You may

[0012]

As described above, according to the present invention, the reserve forces in both directions are normally calculated and prepared for the interconnection points between all distribution lines, or the reserve forces are calculated immediately after an accident occurs. In the event of an accident, select all interconnection points that have interconnections in the power outage group, assign the order of cyclic use to the interchange source in the order of the reserve capacity, and select the distribution line with the wheel rotation.
Since the load is assigned in the following order, there is no need to generate unnecessary combination cases, so there is no waste of calculation time, there is no backtracking to assignment, and there is no need for evaluation calculation each time. Since it is possible to start the operations one after another, it is possible to significantly reduce the total supply disruption time due to the control delay time. Rank 1: It is close to the power source before the accident in the section where there is no communication route with others. Rank 2: The load is the largest in the section where there is no communication route with others. Rank 3: The load is the largest in the section where there is a communication route with other parties.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment for explaining a load accommodation allocation method according to the present invention.

FIG. 2 is a typical example of a power distribution system for explaining the operation of the embodiment.

FIG. 3 is a diagram illustrating the overall operation.

FIG. 4 is a distribution system diagram for explaining the effect of the embodiment.

FIG. 5 is a distribution system diagram for explaining the effect of the embodiment.

FIG. 6 is a flow chart between components for explaining a conventional load accommodation allocation method.

[Explanation of symbols]

 101 Flexible reserve capacity update function 10 Flexible destination extraction function 20 Flexible source extraction function 110 Flexible source wheel number assigning function 120 Branch load selection function 130 Allocation execution function 135 Post-allocation reserve capacity updating function 100 Sending current value from substation 102 Section load equipment Capacity database 103 Distribution line accommodation reserve data 11 Online data 12 Node / branch database 13 Constraction destination group data 21 Constraction destination 115 Distribution line use assigned wheel number 125 Branch load selection order

Claims (2)

[Claims] 1. An interconnection between a power failure load section group that occurs when a supply disruption accident occurs and a distribution line group that has a connection route in the section.
In the load accommodation calculation for determining the allocation combination, prepare the accommodation reserve capacity for all interconnection points of the distribution lines in normal times or calculate it immediately after the occurrence of the accident, and then calculate the corresponding distribution with the power failure load section group and interconnection. When the branch load is selected within the range of its own reserve capacity as viewed from the distribution line around which the wheel turns, when there is no unallocated power failure section, the wheel numbers are assigned in order of increasing reserve capacity for the wires. Then pass
If there is only one unallocated blackout section, select that section and pass the wheel number to the next. If there are multiple interconnections with an unallocated blackout section, the highest ranking is selected according to the following order 1
In addition to selecting only the section, each time the above-mentioned selection is made, the reserve capacity of the corresponding distribution line is reduced by the allocated load and updated.
A load accommodation allocation method characterized by repeating according to the wheel number until there is no selected applicable section. Priority 1: Close to the power source before the accident in the section where there is no communication route with others. Rank 2: The load is the largest in the section where there is no communication route with others. Rank 3: The load is the largest in the section where there is a communication route with other parties. 2. Before selecting a branch load, the total amount of reserves for interconnection is compared with the load amount of the interchange target section group, and when the former is less than the latter, it is recognized that a pool at a point other than the interconnection point is necessary. ,
The load accommodation allocation according to claim 1, wherein the allocation is performed by removing the constraint condition at the time of interconnection allocation, and the resulting insufficient reserve capacity is used as the target accommodation value of the accommodation source distribution line to perform the external accommodation operation. Method.