JP2931639B2 - Distribution system equipment planning support equipment - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial application field) The present invention relates to a distribution system facility planning support device used for capital investment planning of a distribution system in an electric power business.

(Prior Art) In a distribution system, once constructed equipment is used for a long period of time, it is important to carry out appropriate equipment planning in advance. Conventionally, a distribution system facility plan has been formulated as follows. In other words, load estimation is performed based on information on increase / decrease of the load expected in the future and the actual load tendency in the past.

At the assumed future load, using the distribution system facility planning support device, for each distribution line, calculate the overload amount to determine whether or not the allowable capacity of the distribution line has been exceeded, and calculate the voltage of the distribution line. Calculate the amount of voltage drop to determine whether the appropriate voltage specified by the Electricity Business Act is maintained,
If necessary, consider the construction of new or changed equipment.

In the conventional system state, a so-called substation total stop accident in which all transformers stop in a substation transmitting power to a distribution line, a so-called one-bank accident in which one transformer stops in a substation transmitting power to a distribution line, and a distribution line Manually calculate the location of supply disruption in the event of a so-called distribution line accident, the amount of supply disruption, and the location of problems when switching from other distribution lines, and if necessary, install or change the equipment. Consider several.

In addition to the contents of the work studied, based on the construction cost for the facility planning, the annual cost necessary to maintain and operate the constructed facilities, the so-called facility cost, is paid. The amount of power loss is calculated by multiplying the amount of power loss by the unit price of the amount of power loss, and an economic comparison is made of the proposed countermeasures.

Regarding the contents of the examined works, the most appropriate study plan will be formulated as a countermeasure work plan, taking into consideration the occurrence of overload, maintenance of appropriate voltage, supply reliability, and economic efficiency.

(Problems to be Solved by the Invention) In the conventional method described above, only the conventional load, the calculation of the overload amount in the conventional system, the calculation of the voltage drop amount, and the calculation of the distribution loss power amount are performed. Since the study is performed manually by a human system separately, in the case of a distribution system with facilities, it takes a lot of time to consider the combination between countermeasure works, and a limited amount of study time is required. There is an inconvenience that it is not always possible to obtain an optimal countermeasure work plan because the countermeasure work is determined within the project.

The present invention has been made in order to solve the above-described disadvantages, and it is intended to eliminate the study time in the distribution system facility planning, and to obtain a distribution system facility plan in which an optimal solution can be obtained by multifaceted evaluation within a limited time. It is intended to provide a support device.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention determines an overload amount based on a conventionally expected increase or decrease in load on a distribution line,
If necessary, in a power distribution system facility planning support device for examining the contents of construction due to the new installation or change of equipment, inputting a conventionally expected increase / decrease load allows an overload due to the conventional load, a voltage drop amount and a distribution loss to be calculated. Load / voltage / distribution loss amount calculation means, display means for outputting the calculation result, and when the countermeasure work is required based on the display result by the display means, the contents of the work at the location determined to be necessary And equipment for constructing a countermeasure work plan by inputting a countermeasure work plan, and an accident estimating means for calculating and outputting a supply trouble situation when a supply trouble occurs in a conventional system state based on the conventional load and the measure construction data. And cost calculation means for calculating and outputting the cost from the equipment cost according to the content of the countermeasure work and the distribution loss power amount evaluation value in the conventional system state.

(Operation) The means for assuming accidents is to supply substation accidents, 1-bank accidents, and distribution line accidents on the future system based on the conventional load and future construction data, and to supply power at locations where there is a problem with supply, the amount of supply trouble, and the interchange from other distribution lines. At times, the problematic locations are calculated, and the cost calculation means has unit costs for the countermeasure construction work and the amount of power loss. Calculate expenses.

(Example) Hereinafter, an example is described with reference to drawings.

FIG. 2 is a configuration diagram of an embodiment of a distribution system facility planning support device according to the present invention.

In FIG. 2, 1 is an operator, 2 is a man-machine interface device (hereinafter referred to as MMI), 3 is a printing device (hereinafter referred to as KP), and 4 is an electronic computer. The computer 4 includes an overload / voltage drop / distribution loss calculation program 41 corresponding to the overload amount calculation means, the voltage drop amount calculation means, and the distribution loss amount calculation means, and a construction content setting program 42 corresponding to the construction content setting. And an accident estimating program 43 corresponding to the accident estimating means and an expense calculating program 44 corresponding to the cost estimating means.

 Next, the operation will be described.

When examining the distribution system equipment plan,
In the figure, operator 1 calculates the increase / decrease
Input to I2 to set the conventional load. For the conventional load set here, the operator 1 instructs the MMI 2 to calculate the overload, the voltage drop, and the distribution loss amount, so that the overload / voltage drop / distribution loss amount calculation program 41 calculates the overload amount,
Calculate the voltage drop and distribution loss power, and output the calculation result to MMI2 and KP3. Based on the output calculation result, the operator 1 determines whether or not countermeasure work is necessary.
That is, the calculation result indicates whether an overload occurs or whether the voltage drop / distribution loss amount is equal to or more than a predetermined value. Then, the operator 1
Inputs the construction contents from the MMI12, creates a countermeasure construction plan by the construction contents setting program 42, and in the conventional system exhibited, the operator 1 again overloads the MMI2,
Instruct the calculation of distribution loss. When the creation of a countermeasure work plan for a place requiring countermeasure work is completed, the operator 1
Drives the accident assumption program 43 by giving an instruction to the accident assumption by the MMI2.

FIG. 3 is a flowchart showing the processing contents in the case of a substation total stop accident in the accident assumption program.

In step S21, all distribution lines belonging to the substation are set to a no-voltage state, and in step S22, attention is paid to individual distribution lines belonging to the substation, and a distribution line group having an interconnection point by a normally open switch is set. Select as a distribution line on the interchange side.
In step S23, an accident recovery operation procedure (hereinafter simply referred to as a procedure) is performed to minimize the supply interruption for each distribution line.
Create and execute Next, in step S24, as a result of the procedure creation and execution, it is determined whether or not there is a supply failure.If there is a supply failure, the process proceeds to step S245 and among the distribution lines belonging to the substation, the distribution line provided in step S23 is replaced. Considering this, create and execute a procedure to minimize the supply interruption again. If there is no supply failure, the process moves to step S26, and the result is output to MMI2 and KP3 without supply failure. As for the procedure created in step S25, the procedure is created and executed in step S27. As a result, it is determined whether there is a supply obstruction. If there is a supply obstruction, the process proceeds to step S28. , And output the MMI and KP at the locations where there is a problem at the time of interchange from other distribution lines, and terminate. If there is no supply failure, a result of no supply failure is output to the MMI and KP in step S26.

FIG. 4 is a flowchart showing the processing contents in the case of a one-bank accident in the accident assumption program. First, in step S29, all the distribution lines belonging to the transformer are set to no voltage, and in step S30, attention is paid to the individual distribution lines belonging to the transformer. Select a group as a distribution line on the interchange side. In step S31, a procedure is created and executed so as to minimize the supply disturbance for each distribution line. Next, in step S32, as a result of the procedure creation and execution, it is determined whether there is a supply failure, and if there is a supply failure, the process proceeds to step S33, and the distribution line that is interchanged in step S31 among the distribution lines belonging to the transformer. In consideration of the above, a procedure is again created and executed so that the supply trouble is minimized. If there is no supply problem, the process moves to step S34, and the result of no supply problem is output to MMI and KP. Step S
In step 345, as a result of the procedure creation and execution, it is determined whether there is a supply interruption.If there is a supply supply, the process proceeds to step S36 to calculate the supply interruption amount, the supply interruption location, and the time when the connection from another distribution line is exchanged. Output the problematic part to MMI and KP and exit. If there is no supply failure, the result of no supply failure is output to the MMI and the KP in step S34, and the processing ends.

FIG. 5 is a flowchart showing processing contents in the case of a distribution line accident in the accident assumption program. Steps
In step S37, the electric wire is set to a no-voltage state, and in step S38, a distribution line group having a connection point with the distribution line and a switch that is normally open is selected as a distribution line on the interchange side. In step S39, a procedure is created and executed to minimize the supply disturbance for the distribution line. Next, in step S40, the procedure is created, the result of the execution, the presence or absence of a supply failure is determined, and if there is a supply failure, the process proceeds to step S41, the supply failure amount is calculated as a result,
Output to the MMI and KP the locations where supply is interrupted and where there is a problem with the interchange from other distribution lines, and terminate. If there is no supply interruption, the process moves to step S42 and the result of no supply interruption is set to MMI.
Output to KP and exit. Further, based on the output result, the operator determines whether countermeasure work is necessary. At this point, the operator inputs the details of the work from the MMI for the location determined to require countermeasure work, creates a countermeasure work plan using the work content setting program S42, and in the developed conventional system, the operator again overloads and drops the voltage from the MMI. ,
Instruct the calculation of distribution loss.

When the preparation of the countermeasure work plan for the place where the countermeasure work is required is completed, the operator MMI instructs to execute the cost calculation.

FIG. 6 is a flowchart showing the processing contents of the expense calculation program. In step S43, the interest rate for the borrowed money as a fund and the unit price for the power loss amount of the transmission loss in the power distribution system, that is, the loss unit price, are necessary to carry out the construction. In step S44, the construction cost for the countermeasure construction that has been considered is calculated based on the construction cost for the countermeasure construction in the computer. Step S45
Then, the expenses from interest rates, depreciation costs, property taxes, business taxes, etc., which are caused by the countermeasure construction costs, that is, the equipment costs are calculated. In step S46, the accumulated cost equipment cost is calculated by converting the cost of the equipment cost in each year calculated in step S45. Next, in step S47, the power loss in each year in the future system in which the countermeasure work has been developed is calculated, and in step S48, the power loss evaluation value obtained by multiplying the power loss calculated in step S47 by the unit loss price is calculated. In step S49, the cost-accumulated accumulated power loss valuation calculated by the cost based on the power loss valuation in each year calculated in step S48 is calculated. Next, in step S50, the sum of the total cost equipment cost and the total cost loss power amount evaluation value calculated in steps S46 and S49 is obtained and output to the MMI and the KP. Based on the output result, it is determined whether the result of the countermeasure work is economically appropriate. If so, the study of the distribution system equipment plan is completed. If the countermeasure work is not economically feasible, the operator examines the countermeasure work plan, inputs the work details again from the MMI, prepares the countermeasure work using the work content setting program 42, and gives the operator Recalculate from the calculation of overload, voltage drop and distribution loss by MMI again.

[Effects of the Invention] As described above, according to the present invention, in addition to studying overload and voltage drop, study of comprehensive countermeasure work including supply reliability and economic comparison is formulated in a short time. As a result, the time required for power distribution system planning is reduced, and the optimal solution can be obtained in the studied countermeasure work, so that reliable power supply suitable for the modern information society can be provided. This can contribute to reducing expenditures in the business balance of the electricity business.

[Brief description of the drawings]

FIG. 1 is a block diagram of a distribution system facility planning support device according to the present invention, FIG. 2 is a block diagram of one embodiment, FIG. 3 is a flowchart showing processing contents in the event of a total substation blackout, and FIG. 1
FIG. 5 is a flowchart showing the processing contents in the case of a bank accident, FIG. 5 is a flowchart showing the processing contents in the case of a distribution line accident, and FIG. 6 is a flowchart showing the processing contents of an expense calculation program. 10: Distribution system facility planning support device, 11: Accident assumption means, 12: Expense calculation means

Continuation of front page (72) Inventor Hiroshi Suzuki 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Naka Factory (56) References JP-A-1-321821 (JP, A) JP-A-3-239120 (JP, A) JP-A-64-16221 (JP, A) JP-A-56-115140 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02J 3/00-5/00

Claims (1)

(57) [Claims] 1. A distribution system facility planning support device for judging an overload amount on a distribution line based on a conventionally expected increase / decrease amount of a load and examining, if necessary, a construction content due to new installation or change of the equipment. Overload / voltage / distribution loss calculating means for calculating the overload, voltage drop amount and distribution loss by the conventional load by inputting a conventionally expected increase / decrease load; display means for outputting the calculation result; When the countermeasure work is necessary based on the display result by the display means, a work content setting means for creating a work plan for the countermeasure by inputting the work content for the location determined to be necessary, and the future load and the measure Accident assumption means to calculate and output the supply failure situation in the event of a supply failure accident in the future system state based on the construction data, and equipment costs and the conventional system state Distribution system facilities planning support apparatus characterized by comprising a cost calculation means for calculating output expenses from distribution loss watt valuation.