JPH0937462A - Power system configuration creating method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system configuration creating method and device for improving the reliability in a power system by switching system for changing the power flow of a facility which does not satisfy the restriction of the power flow and hence creating a system configuration for satisfying the restriction conditions of the power flow. SOLUTION: A loop facility including an overload facility is detected by an adjacent system state creation part 13 and a plurality of system configurations where the power flow of the overload facility changes are created by stopping a facility for configuring the loop or changing the usage state. The created system configurations are evaluated based on a target function by a system configuration evaluation part 11 and the best system configuration is selected by a selection/storage part 14 in an optimum adjacent state. By repeating the processing, an optimum system configuration is displayed on an output device by an output part 15 in an optimum system configuration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for creating a power system configuration for determining the connection state of power transmission and transformation equipment in a power system.

[0002]

2. Description of the Related Art Conventionally, the Institute of Electrical Engineers of Japan, Volume B110, Volume 9, "Distribution System Connection Change Procedure Determination Method" (pp. 719-72)
As shown in 6), in order to prevent a power failure area during the transition from the initial grid to the target grid, create a loop grid so that the areas to be switched can be transmitted from two grids first, and then from one grid. The power was cut off from the other side, and the power was sent only from the other side.

[0003]

In the prior art, the initial system and the target system are in a state where there is no overload, and during the transition from the initial state to the target state, system switching is performed in order to avoid power failure and overload. Is being carried out. Blackout i.e.
The purpose is to transmit power to a load, and in a power system in which a load and a supply power are mixed, the system is not switched from the system configuration in which the overload has occurred to eliminate the overload.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a method and apparatus for creating a power system configuration that eliminates overload of power transmission and transformation equipment.

[0005]

According to the present invention, a plurality of system configurations are created by switching the system so as to change the power flow of an overloaded transmission and transformation facility based on the system configuration in which an overload occurs. A system configuration without overload is created by selecting the best system configuration from these and repeating the system switching based on the system configuration selected again.

[0006]

[Function] By repeating the system switching for changing the power flow of the overloaded equipment, the system configuration without overload is created.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 18. FIG. 1 shows the configuration of a system configuration creating device.
This device comprises an input device 1, a computer 2, a display device 3 and a database 4. Further, a power system 5 and a power system 6 are provided outside the device. The input device 1 is an input device such as a keyboard, a mouse, and a pointing device. The computer 2 includes a control unit 7, a data setting unit 8, a data reading unit 9, an on / off equipment determination unit 10, a system configuration evaluation unit 11, a processing end determination unit 12, and an adjacent system state creation unit 1.
3. An optimum adjacent system state selection / storage unit 14 and an optimum system configuration output unit 15. The display device 3 is a display device such as a CRT or a liquid crystal screen. The database 4 is a data storage device such as a hard disk, a magnetic tape, an optical disk, and a non-volatile memory. The power system 5 includes a power system planning / operation system, that is, a power demand forecast, a power plant operation plan, a work power outage adjustment, an accident recovery support system, a control system, and a general power database. The electric power system 6 shows the actual sending and delivering equipment and their states, and also shows the sensor information from the relay and the like. The input device 1 selects the process for the item displayed on the display device 3 and sends the input data to the control unit of the computer 2. The computer 2 creates an optimum system configuration based on the data from the input device 1, the data from the database 4 and the data from the power system 5, displays the result on the display device 3, and displays the result on the database 4. Store. In addition, the power system 5
When the computer 2 is requested to create the system configuration under the conditions set by the planning system and the control system, the system configuration and the evaluation result created by the computer 2 are returned to the power system 5. The power system 5 outputs a control signal to the power system 6 based on the system configuration and the evaluation result created by the computer 2 and takes in system information (power flow, ON / OFF of circuit breaker, etc.). Store the imported data and the data created by the planning system in the internal database. The control unit 7 controls the exchange of data among the input device 1, the display device 3, the database 4, and the internal processing unit, so that the entire process operates normally. The outline of the function of the processing unit of the computer 2 is shown below.

The control unit 7 controls the exchange of data between the input device 1, the data setting unit 8 and the processing unit from the output 15 of the optimum system configuration, the database 4, the power system 5 and the display device 3, and exchanges the data. Process and process data for smooth operation. The data setting unit 8 is, via the control unit 7, data of the electric power system which is already stored in the database 4 and is used for creating the optimum system configuration,
Read conditions such as equipment characteristics and objective functions. The read condition is changed to create a new condition, and the created condition is stored in the database 4 via the control unit 7. The data reading unit 9 reads the conditions used for creating the optimum system configuration stored in the database 4 via the control unit 7, sets the conditions to be used,
Output to the control unit 7. On / off equipment determination unit 10
Calculates the power flow based on the power flow calculation conditions given through the control unit 7, and determines the equipment in use (on-equipment) and the equipment in stop (off-equipment) from the power flow value of the power transmission and transformation equipment. And outputs the result to the control unit.
The system configuration evaluation unit 11 inputs the power flow calculation conditions from the control unit 7, calculates an objective function, and outputs the result to the control unit. Based on the information from the control unit 7, the process end determination unit 12 selects a countermeasure facility to be selected from a plurality of overload facilities whose power flow is greater than the constraint value and a process termination determination when the overload facility is exhausted and a better system. When it is determined that the improvement cannot be achieved even if the configuration is repeatedly created, the end determination of the process is output to the control unit 7. The adjacent system state creating unit 13 determines a system switching facility to change the power flow of the countermeasure facility based on the information of the control unit 7, and outputs it to the control unit 7. The optimum adjacent system state selection / storage unit 14 selects and stores the system configuration having the best objective function among the system configurations of the adjacent states created by the adjacent system state creation unit 13. Output section 1 of the optimum system configuration
5 selects and stores the system configuration having the best objective function among the system configurations of the adjacent states selected by the optimum adjacent system state selection / storage unit 14, and displays the result on the display device 3.

The functions of the system configuration creating device include the function of setting data of the power system, setting of system creating conditions, setting / editing of data consisting of setting of objective function / adjacent state, and creating of optimum system configuration.

First, data setting / editing will be described. The display device 3 first displays the initial menu screen 50 shown in FIG. On the initial menu screen 50, it is possible to select data of the power system of item 1, setting of planning condition of item 2, setting of objective function of item 3 and creation of optimum system configuration of item 4. When setting / editing the data used for creating the system configuration, by selecting any one of items 1 to 3, the data setting unit 8 can set each item. The processing of the data setting unit 8 will be described.

When the data of the power system of the item 1 is selected by the input device 1, the data already created in the database 4 is called by the registration number, or the data of the database of the power system 5 is called and edited. Create power system data. There is a comment field associated with the registration number so that it is possible to understand what kind of condition the data of this registration number is. The edited result is newly registered in the database 4 together with the registration number. The power system data is the name of the facility,
Characteristics, connection information between facilities, circuit breaker, disconnecting switch on / off information, characteristics and output for generators, load, demand, etc. When the setting is completed, the initial menu screen 50 is displayed again.

When the setting of the system creation condition of item 2 is selected, it is possible to set an on-disabled facility and an off-disabled facility whose on / off states cannot be changed when switching the system. In addition, one or more adjacent states of the system configuration that can be transferred are selected. Here, the adjacent state is defined as system switching that changes the power flow of the equipment of interest in a unit operation. By repeating this unit operation in sequence, it is possible to make a transition to a system configuration in which the power flow of the facility of interest can be changed. In order to change the power flow of the target equipment, the electric power that has been flowing through the target equipment may be passed through another route. Here, as shown in FIG. 3, the unit operation means (1) turning on a certain equipment to newly construct a loop including the equipment of interest, and turning off one of the equipment constituting the loop (loop (In and loop cut), (2) If the facility of interest is included in the loop, turn off one of the facilities that make up the loop (loop cut only), (3) Loop that newly includes the facility of interest. To turn on some equipment to configure (loop-in only), either. The set system creation conditions are stored in the database 4. When the setting is completed, the initial menu screen 50 is displayed again.

By selecting item 3, the objective function and the adjacent state can be set. The objective function is for evaluating the state of the system, and may be one that can be uniquely calculated once the system is determined. Here, in order to define this function, it is stored in the database 4 together with the registration number and the comment as a new objective function by editing and newly creating the already registered function. When evaluating a system by system switching, the registration number of the objective function to be used may be specified. Although the objective function can be set freely, the following can be considered as a concrete example of the objective function. For example, for the purpose of suppressing the power flow flowing through a transmission line within a constraint value, the smaller this objective function is, the better the system. Objective function Z
Uses the set weighting coefficient and evaluation function f for each facility on the objective function setting screen. Focusing on the tidal current, it becomes as shown in equation (1).

Z = Σwj × fj (Fj / Rj) (1) j: facility number wj: weight coefficient of facility j Fj: power flow value of facility j Rj: power flow constraint value of facility j fj (Fj / Rj): Evaluation function for margin of constraint condition and degree of violation Here, by increasing the weighting factor of important equipment, a system with more margin can be configured for important equipment, and the reliability can be increased. In addition, if a single accident occurs in work equipment or nearby equipment, it will be affected by a power outage, etc. Therefore, if a system configuration that does not use work equipment is more reliable, the weighting factors of these equipment are It is also possible to increase. By changing the weighting coefficient and the evaluation function f in this way, the required system configuration can be tuned. That is, if the evaluation function f is made linear as in the equation (2), a system with a high margin is selected on average, and as shown in the equation (3), Fj / Rj is 1 or more, that is, the constraint violation occurs. When it occurs, by setting it to a very large value, it is possible to make the number of facilities that violate the constraint small and the facility with a small weighting factor easily violate the constraint. The setting screen of the objective function is shown in FIG. These settings are decided by the user in consideration of operation.

Fj (Fj / Rj) = Fj / Rj (2) fj (Fj / Rj) = Fj / Rj if Fj / Rj <a1 = k1 if a1 ≦ Fj / Rj <a2 (3) = k2 if a2≤Fj / Rj a value less than 1: 1, for example, 5% allowance, 0.95 a2: 1 or less, for example, 1% allowance greater than 0.99 k1: 1 If attention is paid to a numerical value, for example, a value that is sufficiently larger than 2 k2: k1, for example, 5 increase in power generation cost by changing the output of the generator and power failure due to an accident, these can be added to the objective function. Furthermore, when the supply capacity and the load change with time, the objective function can be how long the generated system configuration can be maintained as a system without overload. This is because the system reliability is evaluated to be low if an overload occurs within a short time even if the created system configuration is valid for only a single time.

From the power system 5, power system data, planning conditions, objective function / adjacent state, etc. can be set. When the setting is completed, the initial menu screen 50 is displayed again.

Next, in order to create an optimum system configuration,
On the initial menu screen 50 of the display device 3, the optimum system configuration creation 4 is selected by the input device 1. FIG. 5 shows a schematic processing flow for creating an optimum system configuration. This processing is realized by using each processing unit of the system configuration creating apparatus of FIG. The processing for creating the optimum system configuration will be described according to the processing function unit centered on the computer 2 and the processing flow of FIG.

The data reading unit 9 carries out the processing of data reading 21. The data reading unit 9 determines the data to be used by the registration number from the power system data set in the data setting unit 8 and stored in the database 4, the planning condition, the objective function / adjacent state, etc. take in. For system switching, data in which the system configuration as shown in FIG. 6 is expressed as a node branch shown in FIG. 7 is used. Here, a branch point that divides the power flow is a node, and a point between them is a branch. A, B, C, D, E, F shown in FIG.
G, H, and I are busbars. a, b, c, d, e, f are transmission lines, g, h, i are transformers. Since the circuit breakers (CB) at both ends of the power transmission line c and the power transmission line f in FIG. 6 are off,
The power transmission line c and the power transmission line f are also in an off state (state in which power transmission is not possible)
It is. Here, the equipment (transmission and transformation equipment) of the electric power system related to the system switching is connected to the transmission line, the transformer, the bus, the bus tie,
The bus section. Transmission lines, transformers, bus ties, bus sections are expressed as branches, and bus lines are expressed as nodes.
Supply power (generator) and load are expressed in the same way as in the system diagram. In this example, it is a radial system. The characteristic of the radial system is that when the power transmission line c or the power transmission line f that is turned off is turned on (change CB to on), it always becomes a loop system and that the system is not separated (following on-state equipment) By doing so, it is possible to connect any two nodes).

The on / off equipment determination unit executes processing 22. In this process, off equipment (stopped equipment) and on equipment (used equipment) are determined in the current system configuration. The off facility can be determined by the connection state of the facility. Alternatively, according to the process flow shown in FIG. 8, even in a system configuration in which loops are intricately entangled,
You can ask for on equipment. In process 221, power flow calculation conditions such as power system data, facility characteristics, supply capacity and load data are set. Here, the supply power and the load are set such that the totals of the two match, and the supply and demand data and facility transmission zero of the branch are set. In the actual power system, it is not possible to set the load and the supply power to any node, but as shown in FIG. 9, it is assumed that the load and the supply power can be virtually set to any node. While the screen of FIG. 9 is displayed, the supply power + b is set to all the nodes, and then the load of (the number of nodes × b) is set to one representative node. The total load of the representative node is ((number of nodes-1) x b). Here, b is a value other than zero. As a result, the tidal current flows in one direction from each node toward the representative node, so that the tidal current of the on-equipment can be prevented from becoming zero. In process 222, the number of equipment sets of all branches shown in Expression (4) is calculated from the data of the system configuration.

ALL = {all equipment: equipment 1, equipment 2, equipment 3, ...} (4) By processing 223, the power flow of each branch is calculated based on supply and demand data, equipment characteristics, and current system configuration. To do. Process 224
Then, it is determined whether or not the power flow of the branch is zero. The branch having zero power flow is registered as a set of off-equipment of the equation (5) by the process 225.

OFF = {OFF facility: OFF1, OFF2, OFF3, ...} (5) Similarly, for a branch in which the tidal current is not zero, processing 226 is performed.
Is registered as a set of on-equipment of Expression (6).
In FIG. 9, ON equipment is indicated by a thick line and OFF equipment is indicated by a thin broken line.

ON = {on facility: on 1, on 2, on 3, ...} (6) In process 227, it is determined whether all branch facilities are classified as off facility and on facility, and all are determined. If yes, this process ends, and if there is any equipment that has not been determined, process 22
Return to 4. From the above, whether all branches are on facility,
It is determined whether the equipment is off.

The system configuration evaluation unit 11 executes the system configuration evaluation 23 process. FIG. 10 shows a processing flow for evaluating the current system configuration. In process 242, the power flow calculation condition is set. In process 243, the tidal current is calculated based on the conditions set in process 242. If there is an overload, calculate by economic load distribution with tidal current constraint,
Consider whether the overload can be eliminated. If it can be resolved, the power flow after the allocation change of the supply capacity and the cost increase due to the allocation change are output. If it cannot be resolved, the original power flow value is output. In process 244, the objective function is calculated based on the power flow calculation result of process 243 using the function selected in the process 21 of reading data, and the current power system data is stored together with the objective function value.

The processing end judging unit 12 judges whether the processing condition 24 satisfies the constraint condition and judges whether the same system configuration has existed in the past of the processing process 26. Here, the process 24 will be described. The process 24 includes a process of determining whether to terminate the process of creating the optimum system configuration and a process of selecting which facility to take countermeasures when an overload occurs in a plurality of facilities. There are two determinations of the processing end here, one is when the overload is completely eliminated, and the other is when the processing of the overload countermeasure does not converge due to the same process. First, the overload check process shown in FIG. 11 will be described. In process 245, the number of on-equipment is set. In process 246, the set OverLo of overloaded equipment
Initialize ad as an empty set. In process 247, it is checked whether the on-equipment i is overloaded. If there is an overload, the on equipment i is registered in the set OverLoad of overload equipment, and if there is no overload, the registration processing is not performed. In process 249, it is determined whether or not the overload check of all the on-equipment is completed.
If there are unchecked on-equipment, process 247
Return to When the overload check of all the on-equipment is completed, it is determined in process 250 whether there is no overloaded equipment, that is, whether the set OverLoad of overloaded equipment is an empty set. If the set is an empty set, the system configuration does not have an overloaded facility, and thus the process 27 is performed. If there is equipment that is overloaded, move to the processing that selects equipment for overload countermeasures.

When there are a plurality of overloaded facilities, it is necessary to decide which facility should take measures. FIG. 12 shows a flow of overload countermeasure equipment selection. In process 251, the initial priority and the number of countermeasures for each facility are read. The initial priority order is a priority order that determines from which equipment when overload occurs at a plurality of locations for all branches. This priority is determined from the reliability of the grid. For example, there is a method of using a predetermined order of important equipment. This will speed up the system configuration that can eliminate the overload of important equipment. Alternatively, the order of the ratio of the power flow value to the constraint value may be large, that is, the order of the overload ratio may be large. In process 251, the number of times that the equipment was overloaded at the same time and that was previously selected as the countermeasure equipment is read.
In process 252, the priority order to be adopted is determined based on the number of countermeasures set in process 251 and the initial priority order. The priority to be adopted is sorted by two variables. The first variable is the number of measures and the second variable is the initial priority.
That is, sorting is performed based on the number of times of countermeasures, and when the number of times of countermeasures is the same, the priority order to be adopted is determined such that the higher priority order has the higher priority order. The reason for changing the order of measures is that the range of solutions to be searched can be expanded by taking measures for various kinds of equipment rather than taking measures for the same equipment only. It is also possible to use the initial priority. As a result, it is possible to determine the priority order of the equipment to be taken measures and take the measures in this order as much as possible. In process 253, the number of branches is set, and in process 254, the priority number is initialized. In the process 255, it is checked whether the equipment of the priority order i is included in the equipment of overload. If it is not an overload facility, the process moves to process 258. If it is included in the overloaded equipment, it is once registered as equipment to be dealt with this time in process 256. In process 257, it is checked whether or not the equipment for which the countermeasure has been taken last time and the equipment selected this time are the same. This is because when the same equipment as the previous one is selected, the same equipment is selected thereafter, so that it is excluded.
In the case of the same equipment, the equipment to be dealt with in process 258 is the equipment of the next priority. When another equipment is selected, the countermeasure equipment at this time is equipment of priority i. Process 259
Then, it is judged whether all the branches have been checked. If there is equipment not checked, process 25
Return to 5. As a result of checking all in the process 260, if the selected facility this time is the selected facility last time, the process moves to the process 27. Here, the overload equipment to be taken as a countermeasure is selected based on the initial priority order and the number of times the equipment is selected as the overload countermeasure equipment, but it is also possible to select using the tab search method. At this time, the tab list stores the equipment name for which overload measures have been taken. For example, if the tab list length is 3,
Overload countermeasure equipment selected in the last three times will be excluded from this countermeasure equipment candidate. The equipment with the highest priority is selected as the countermeasure equipment from the removed overload equipment.

When the countermeasure equipment is determined in the process 257, FIG.
The process moves to the process 25 of creating / evaluating and storing the adjacent state of process 25. The process shown in FIG. 13 is performed by the adjacent state creating unit 13, the system configuration evaluating unit 11, and the optimum adjacent system state selecting / storing unit 1.
4. The detailed contents of the process 261 are shown in the flow of creating a combination of adjacent states in FIG. 14, the creation of a combination of adjacent states by the existing loop cut, the creation of a loop of FIG. 16 or the creation of a combination of adjacent states by creation and cut. The creation and evaluation of the adjacent state of FIG. 13 will be described. Processing 2
At 61, the adjacent state creating unit 13 creates all combinations of adjacent states. This is expressed by the following equation (7).

Combination number i = (in-equipment, cut-equipment) (7) Here, the in-equipment is the equipment name for newly turning on the equipment that was off, and the cut-equipment newly added the equipment that was on. The equipment name to turn off. When including the case of cutting the existing loop in the adjacent state, there is no in-equipment, so we will enter zero. When creating a new loop in the adjacency state, there is no cut facility, so zero is entered. When creating and cutting a loop, the equipment name is entered for both the in-equipment and the cut equipment, not zero.

In process 261, the number of combinations of adjacent states is calculated,
In the process 262, the number of combinations of adjacent states is substituted for the variable g. In process 263, the combination number i in the adjacent state is initialized. In process 264, the current system configuration data is changed based on the in-equipment and the cut-equipment of the combination number i in the adjacent state shown by the equation (7). In process 265, the system configuration evaluation unit 11 evaluates the current system configuration according to the process flow shown in FIG. The objective function is calculated by power flow calculation.
The processing 266 and the processing 267 are processed by the optimum adjacent system state selection / storage unit 14. In process 266, the objective function calculated in process 265 is compared with the objective function of the system configuration of the adjacent state that has already been created, and if the objective function is the smallest among the system configurations of the adjacent states obtained up to now, the process is performed. At 267, this objective function value and system configuration are stored. Then, as in the case where the objective function value is not small, the process 268 is performed.
Move on to. In process 268, the system configuration before the system is changed in process 264 is restored. In process 268, the adjacency state creation unit 13 increases the combination number. In process 270, it is determined whether or not all the created system configurations in the adjacent state have been checked. If there is a combination of adjacent states that has not been checked, the process returns to step 264. If all are checked, the process 26 is entered. In the above process, the system configuration with the minimum objective function value is obtained using all adjacent states, but tab search that speeds up the process is performed by limiting the states evaluated in the adjacent states. It can also be used. If tab search is used, process 264, process 2
In step 65 and step 266, evaluation is made excluding the combination of incut equipment names stored in the change state, that is, the tab list, which is defined as not to be evaluated. The tab list is a finite length list, and at the timing when the process 270 ends and the process moves to the process 26, a combination of incut equipment names for which the objective function is the minimum in the process 267 is newly registered. Since the tab list has a finite length, only the combination of the closest incut equipment names is stored, and the oldest combination is deleted. According to the tab list, the change state not to be evaluated is determined by the in-equipment name and the cut equipment name, and does not consider whether it is the in-equipment or the cut equipment. When the process 25 is executed for the first time, the tab list is empty, and the process 25 is repeated to add or delete the tab list.

Here, in the processing of the processing 261, as shown in FIG. 14, the number of incut combinations is initialized in the processing 271,
If the process 272 includes cutting a loop that is already in the adjacent state, the process 273 creates the adjacent state. Furthermore, when the system configuration created by the process of creating a loop is included in the adjacent state, the adjacent state is added in process 274. Details of the process 273 shown in FIG. 15 will be described. In process 276, the power flow calculation condition is set. Here, the data of the power system in which the data of the supply power and the load are set to zero is set. The process 277 sets the number of ON facilities. In process 279, as shown in FIGS. 17 and 18, the supply power + a and the load -a are set to both end nodes of the selected equipment selected in the overload countermeasure equipment selection flow of FIG.
The numerical value a is a numerical value other than zero. In process 280, the tidal current is calculated based on the set conditions. When there is a path through which power flows other than the selected equipment, the supply power or load set at both ends is not the same as shown in FIG. In FIG. 18, the loop-forming equipment is indicated by a thick line so that it can be distinguished from other equipment. In process 281, it is checked whether the power flow of the selected equipment is a. When the power flow of the selected equipment is a as shown in FIG. 17, there is no detour route, and the process moves to process 288. The process 282 initializes the number of the on-equipment.
In process 283, a device that satisfies the condition that the power flow is not zero among the on-devices and is not the off-disabled device set in process 21 is searched. If there is a bypass route in process 283, a combination of incuts for creating the adjacent state is registered as in formula (8) in process 284.

Combination number j = (0, on-equipment) (8) The first zero means that there is no equipment to be turned on for loop creation, and the later on-equipment is for cutting an existing loop. This is the name of the on equipment that is changed to stop. Processing 2
If 84 ends or the on-equipment does not satisfy the condition of the process 283, the facility number is incremented by the process 285. In process 286, it is determined whether or not the tidal current has been checked for all the on-equipment. If there are unchecked facilities, the process returns to step 283, and if all on-devices are checked, the process proceeds to process 287. Process 28
In No. 7, the variable j indicating the number of combinations of on-off switching of the equipment in the adjacent state is increased. In process 288, the change in process 279 is undone. As described above, it is possible to create an adjacent state in which the on-equipment is turned off to break the existing loop and change the power flow of the selected overload equipment.

Next, the process 274 shown in FIG. 14 will be described with reference to FIG. In process 289, the data of the power system in which the data of the supply capacity and the load are set to zero is set. A process 290 sets initialization of the number of off facilities and the number of off facilities. In process 291, the off facility h is changed to on and the number of on facilities is set. In process 292, the supply power + a and the load -a are set to both end nodes of the selected overload facility. The numerical value a is a numerical value other than zero. Based on this condition, the power flow is calculated in process 293.
In process 294, it is determined whether the power flow and the load are set and the flow of the selected overload facility is a, and whether there is a bypass route. If the tide is a, it means that there is no detour route, and the process moves to step 305. If the tide is not a,
The process moves to the processing 295 to search for the alternative route. Process 295
Then, the on-equipment number, which can be a detour route, is initialized. In the process 296, among the on-equipment, the equipment that satisfies the condition that the power flow is not zero and is not the off-impossible equipment is searched. In process 297, when it is defined that creating a new loop is included in the adjacent state, the process proceeds to process 298, and otherwise, the process proceeds to process 300. In process 298,
As a combination of incuts to create adjacent states,
Register as in equation (9).

Combination number j = (selected equipment, 0) (9) The first selected equipment is the equipment name to be turned on for loop creation, and the trailing zero is turned off to newly break the loop. Indicates that there is no equipment.

The process 299 increases the number of combinations that create the adjacent state.

In process 300, a new loop is created,
Further, when it is defined that the breaking of the loop is included in the adjacent state, the process moves to the process 301, otherwise, the process 3
Move to 03. In process 301, a combination of incuts for creating an adjacent state is registered as shown in Expression (10).

Combination number j = (selected equipment, on-equipment) (10) The first selected equipment is the equipment name to be changed to ON for loop creation, and the later ON equipment is OFF for cutting the created loop. Is the equipment name.

The process 302 increases the number of combinations that create adjacent states.

Process 303 increments the number of on-equipment. The process 304 determines whether or not the power flows of all the on-equipment have been checked. If there is any on-equipment that has not been checked, the process returns to step 296, and if all the on-equipment flows have been checked, the process proceeds to step 305. Process 30
No. 5 returns to the state before the change in the process 292. The process 306 is incrementing the number of the off facility. Processing 3
07 determines whether or not all off equipment has been turned on. If there is any equipment that has been turned off but not turned on, the process returns to step 291. If all the off equipments are turned on and checked, the process proceeds to processing 275 of FIG. Also,
When the process 275 ends, the process moves to the process 262 of FIG.

The processing 26 is processed by the processing termination judgment unit 11 and sequentially stores the system configuration having the smallest objective function among the system configurations adjacent to the system configuration evaluated in the process 23. At this time, if the best system configuration among the newly created adjacent states in the process 25 has the same system configuration as the system configuration stored before that, the process 25 is performed thereafter.
Since it is possible to create the same system configuration in
Move to. If the same system does not exist in the past, a new area can be searched for, and the process returns to step 22. Process 22
By repeating the processing 26 to 26, it is possible to create a system configuration having the best objective function, and in process 27, the output system 15 of the optimum system configuration outputs this system configuration to the display device 3.

According to the present invention, it is possible to create a system configuration capable of minimizing overload, and a system configuration having a high reliability of the power system.

[0040]

As described above, according to the present invention, the processing of switching the system is repeated so that the system configuration including the overload equipment that does not satisfy the constraint value of the power flow can be changed so as to change the power flow of the overload equipment. As a result, the system configuration with the smallest overload can be created, and the reliability of the power system can be improved.

[Brief description of drawings]

FIG. 1 is a configuration of a system configuration creating device.

[FIG. 2] Initial menu screen.

[Fig. 3] Loop-in cut.

FIG. 4 is an objective function setting screen.

FIG. 5 is a schematic process flow of creating an optimum system configuration.

[Fig. 6] System configuration.

FIG. 7 is a node branch expression of transmission and transformation equipment.

FIG. 8 is an on / off equipment determination flow.

FIG. 9: Setting of supply and demand data for on-device determination.

FIG. 10 is an evaluation flow of a system configuration.

FIG. 11 is an overload check flow.

[FIG. 12] Overload countermeasure equipment selection flow.

FIG. 13: Creation and evaluation of adjacent states.

FIG. 14: Creating a combination of adjacent states.

FIG. 15: Creating a combination of adjacent states by existing loop cuts.

FIG. 16: Creating a loop or a combination of adjacent states by creating a loop and cutting.

FIG. 17: Setting of supply and demand data for loop facility determination.

FIG. 18: Display of loop equipment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input device, 2 ... Computer, 3 ... Display device, 4 ... Database, 5 ... Electric power system, 6 ... Electric power system, 7 ... Control part, 8 ... Data setting part, 9 ... Data reading part, 10
On / off equipment determination unit, 11 System configuration evaluation unit, 13
Adjacent system state creation unit, 14 ... Optimal adjacent system state selection storage unit, 15 ... Optimal system configuration output unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Nakata 5-2-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Omika factory

Claims (14)

[Claims] 1. A power system configuration including a part for calculating a power flow, a part for evaluating a calculation result of the power flow, and a part for creating a system configuration for changing the power flow of a transmission and transformation facility of interest based on the evaluation result. Creation method and device. 2. The power system creation method and apparatus according to claim 1, wherein the part for creating a system configuration for changing the power flow of the transmission and transformation equipment of interest is at least one of the equipment forming a loop including the equipment of interest. A power system configuration creating method and device, characterized in that a power system flow is created by changing the power flow of a transmission and transformation facility of interest by stopping two facilities. 3. The power system creation method and apparatus according to claim 1, wherein a part for creating a system configuration for changing the power flow of the power transmission and transformation equipment of interest is to form a new loop including the equipment of interest. A power system configuration creating method and device, characterized by changing the power flow of a transmission and transformation facility of interest by changing at least one facility from a stopped state to a use state. 4. The power system creation method and apparatus according to claim 1, wherein a part for creating a system configuration for changing the power flow of the power transmission and transformation equipment of interest is to form a new loop including the equipment of interest. A system configuration is created by changing at least one piece of equipment from a stopped state to a use state and stopping at least one piece of equipment of the newly created loop to change the power flow of the transmission and transformation equipment of interest. A method and apparatus for creating a power system configuration, characterized by: 5. A combination of equipment names of state changes is stored in a tab list according to claim 2, and when a new state change is generated, the combination of equipment names in this tab list is temporarily placed in an adjacent state. A power system configuration creating method and apparatus characterized by using a tab search method. 6. The load and the supply power are virtually set at both branch points of the power transmission and transformation equipment sandwiched between the branch points capable of diverting an arbitrary power flow according to any one of claims 2 to 4, and the other power is transmitted. A method and apparatus for creating a power system configuration, characterized in that the load and supply capacity of a substation facility are set to zero, and the power flow is calculated to detect the facilities forming a loop. 7. The power transmission / transformation facility according to claim 6, wherein loads and supply power are virtually set at both branch points of the power transmission / transformation facility sandwiched between the branch points capable of diverting an arbitrary power flow. A method and apparatus for creating a power system configuration, wherein the power flow calculation result is displayed on a system diagram with the load and supply capacity of each set to zero. 8. The system diagram according to claim 6, wherein the name of the power transmission / transformation facility having a non-zero power flow value is displayed or the display of the power transmission / transformation facility having a zero power flow value is distinguished from the display of the power transmission / transformation device having a non-zero power flow value. And a method and apparatus for creating a power system configuration. 9. A portion for creating a system configuration for changing the power flow of a power transmission and transformation facility to which attention is paid according to claims 1 to 4,
A method and apparatus for creating a power system configuration, characterized by creating a system configuration that changes the power flow of a transmission and transformation facility of interest based on the evaluation results of power flow calculation of a plurality of time sections. 10. A tab search method is used to select a power transmission / transformation facility of interest in the portion for creating a system configuration for changing the power flow of the power transmission / transformation facility of interest in claims 1 to 4 or 9. A power system configuration creating method and device characterized by the above. 11. The power system configuration creation method and apparatus according to claim 10, wherein the tab list is a name of the power transmission and transformation equipment that has changed from a stopped state to a used state or from a used state to a stopped state. Method and apparatus. 12. The electric power according to any one of claims 1 to 11, wherein the created function for evaluating the system is a ratio of a power flow of each transmission and transformation equipment to a constraint value of each equipment with a weighting coefficient. System configuration creation method and device. 13. A power system configuration creating method and apparatus, wherein at least one of a loop power flow, a voltage and a breaking capacity associated with a state transition of the system is added to the function for evaluating the system of claim 12. 14. A power system configuration creating method and apparatus, which is a power operation and planning system using the power system configuration creating method and apparatus of claim 1.