JP2006271148A - Electric power procurement planning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric power procurement planning system with which a power procurement amount by each procurement place can economically and efficiently be planned while a state of each procurement place is considered for procuring electric power of a target electric power procurement amount from a plurality of procurement places such as a plant and an electric power dealing market. <P>SOLUTION: The electric power procurement planning system 40 is provided with a data base 42 storing cost characteristic information showing a characteristic of cost with respect to the electric power procurement amount and inter-state shift propriety information showing propriety of shift of a plurality of states that the procurement place 1 can take and a means 41 satisfying a restriction condition comprising a shift restriction condition making a procurement time state of each procurement place 1 from a state just before procurement, which is recognized by inter-state shift propriety information, to a shift possible state and realizing a planning processing for planning the electric power procurement amount by each procurement place 1 by aiming minimization of total cost of the respective procurement places, which is recognized by cost characteristic information, while the total electric power procurement amount by the procurement places 1 is set to be the target electric power procurement amount. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric power procurement planning system that plans the electric power procurement amount by each of the suppliers when the electric power of a target electric power procurement amount is procured from a part or all of a plurality of suppliers.

When a newly entered electric power company, due to partial liberalization of the electric power market, entrusts electricity procured from a number of suppliers to retail customers via a transmission line operated by an electric power company, the transmission line From the viewpoint of ensuring the stability of the system, the same amount of duty is imposed simultaneously.
Here, the electric power procured from the above suppliers includes electric power purchased from other electric power companies or electric power companies through the electric power trading market, in addition to electric power generated by a power plant operated by itself.

  The obligation of the same amount is the total amount of power procured by the electric power company procured by the above-mentioned multiple suppliers with respect to the supply obligation amount, which is the total amount of electricity that is consigned to consumers. It is an obligation that the power procurement amount, that is, the total power supply amount supplied to the transmission line must be matched within a specified period such as 30 minutes.

  Then, in order to achieve the same amount of obligations, the above-mentioned electric power company, when procuring a target power procurement amount corresponding to the above-mentioned supply obligation amount from some or all of a plurality of suppliers, It is important to plan the amount of power procurement by suppliers economically and efficiently.

  In general, an electric power procurement planning system for planning the amount of electric power procurement by each supplier as described above is an optimal solution that is economical and efficient, that is, the supply obligation amount and the total electric power procurement amount match. It is configured to be able to execute a planning process that uses mathematical programming to determine the amount of power procurement at each supplier that minimizes the total procurement cost, which is the total procurement cost required to transmit power at each supplier. A system is known (see, for example, Patent Document 1).

JP 2004-048852 A

  However, in the conventional power procurement planning method, the amount of power procurement of each supplier is planned without considering the state of each supplier immediately before the procurement of power, so in practice the supplier If, for example, the state immediately before procurement is stopped and power cannot be supplied immediately even at the time of procurement, the actual amount of electricity procured by the supplier is insufficient for the planned amount of electricity procurement, You may not be able to meet your obligations.

  The present invention has been made in view of the above-described problems, and the purpose of the present invention is to procure a target power procurement amount from some or all of a plurality of suppliers such as a power plant and a power trading market. An object of the present invention is to provide an electric power procurement planning system that can economically and efficiently plan the amount of electric power procurement by each of the suppliers while considering the state of the suppliers.

In order to achieve the above object, the power procurement planning system according to the present invention is designed to plan the power procurement amount by each of the suppliers when procuring the target electricity procurement amount from some or all of the plurality of suppliers. In the procurement planning system, the first characteristic configuration includes, as the supplier information for each of the plurality of suppliers, cost characteristic information indicating a cost characteristic with respect to the amount of power procurement, and a plurality of states that the supplier can take A supplier information database storing information on whether or not transition between states indicating whether or not transition between
Restriction conditions including a transition restriction condition that makes it possible to shift the procurement state that is the state at the time of procurement of each of the suppliers from the immediately preceding procurement state that is the state immediately before the procurement recognized by the inter-state transition availability information The total cost that is the total of the costs of each supplier recognized from the cost characteristic information while satisfying and using the target power procurement amount as the total power procurement amount that is the total amount of power procurement by each supplier For the purpose of minimizing power consumption, it is provided with a power procurement amount planning means capable of executing a planning process for planning a power procurement amount by each of the suppliers.

According to the first feature configuration, each of the suppliers can achieve the same amount of obligations by executing the planning process by the power procurement amount planning means and planning the amount of power procurement by each supplier. It is possible to plan the amount of power procurement by the method economically and efficiently. Furthermore, as a constraint condition in the planning process, by satisfying the transition constraint condition, the procurement status of each supplier can be shifted from the status immediately before procurement. It is possible to procure the amount of electric power planned by the planning process, and it is possible to reliably achieve the same amount of duty.
Therefore, according to the present invention, by providing the supplier information database and the power procurement amount planning means, it is possible to plan the power procurement amount by each supplier economically and efficiently while considering the state of each supplier. A possible power procurement planning system can be realized.

In the second characteristic configuration of the power procurement planning system according to the present invention, the supplier information database stores, as the cost characteristic information, state-specific cost characteristic information indicating a characteristic of the cost with respect to the plurality of state-specific power procurement amounts. And
In the planning process, the power procurement amount planning means obtains the total cost in the procurement state of each supplier recognized from the state-specific cost characteristic information as the total cost.

  According to the second characteristic configuration, the cost characteristic information by state is stored as the cost characteristic information by the supplier information database, and the cost of each supplier is determined in the planning process by the power procurement amount planning unit. By using the cost at the time of procurement recognized from the cost characteristic information for each status above, the amount of power procured by each supplier can be reduced for the purpose of minimizing the exact total cost according to the procurement status of each supplier. Can be planned economically.

According to a third characteristic configuration of the power procurement planning system according to the present invention, the supplier information database stores, as the supplier information, state-specific adjustment limit information indicating an adjustment limit of the power supply amount for each of the plurality of states. ,
In the planning process, the power procurement amount planning means does not deviate from the adjustment limit of the state at the time of procurement recognized from the adjustment limit information for each state, as the restriction condition in the planning process. It is in the point of adding the adjustment constraint condition to be assumed.

  According to the third characteristic configuration, the state-specific adjustment limit information indicating an adjustment limit such as an adjustable range and a maximum adjustment rate of a plurality of power supply amounts according to a plurality of states as the supplier information by the supplier information database. The above-mentioned adjustment constraint condition that the adjustment status at the time of procurement of each supplier does not deviate from the adjustment limit of the procurement status recognized from the above-mentioned adjustment limit information for each status by the above power procurement plan means By executing the above planning process in a form that satisfies the requirements, it is possible to reliably procure the adjusted amount of power by appropriate adjustments that do not deviate from the adjustment limits at the time of procurement. The amount obligation can be achieved more efficiently.

In a fourth characteristic configuration of the power procurement planning system according to the present invention, the supplier information database stores, as the supplier information, state-specific duration limit information indicating duration limits of the same state for each of the plurality of states. And
In the planning process, the power procurement amount planning means recognizes the duration of the procurement state by each of the suppliers from the duration limit information according to the state as the constraint condition. It is in the point which adds the duration constraint which shall not deviate from.

  According to the fourth feature configuration, the state-specific duration limit information indicating the duration limit such as the allowable duration of the same state for each of a plurality of states is stored as the supplier information in the supplier information database. In addition, the above-mentioned duration constraint condition that the duration at the time of procurement of each supplier does not deviate from the duration limit of the procurement status recognized from the status-specific duration limit information is restricted by the power procurement amount planning means. By executing the above planning process in a form that satisfies the conditions, it is possible to reliably procure an adjusted amount of electric power at an appropriate duration without departing from the duration limit by each supplier during procurement. , The same amount of obligations can be achieved more efficiently.

  An embodiment of a power procurement planning system according to the present invention will be described with reference to the drawings.

FIG. 1 shows a state where an electric power company procures electric power from a plurality of suppliers 1 and retail-deliveres the procured electric power to a plurality of consumers 4 via a power transmission line 2 operated and managed by an electric power company 30. It is a figure.
The consumer 4 supplies and consumes the power received from the power transmission line 2 to the power consumption unit 6 through the power meter 5, and a part or all of the power received from the power transmission line 2 is used in the electric business. It can be covered with electricity purchased from a person.

Examples of the plurality of suppliers 1 include a power plant 10 operated and managed by the electric power company, a power trading market 20 that trades power from other electric power companies, and a power company 30 that operates and manages the transmission line 2. Can be mentioned.
Further, the power plant 10 is provided with a power generation facility 12 capable of supplying generated power to the transmission line 2 through a power meter 11 and a power generation control unit 13 for controlling the power generation output of the power generation facility 12. .

According to the power plant 10, the electric power company 10 can procure power corresponding to the generated power supplied to the transmission line 2 by the power generation facility 12. According to the power transaction market 20, the forward transaction or spot transaction can be used. It becomes possible to procure the power for which the transaction is completed.
In addition, regarding the electric power company 30, when the electric power company carries out retail consignment of electric power to a plurality of consumers 4, when the same amount of duty cannot be achieved, the shortage of electric power is supplied. Electric power is supplied in the form of supply, but the electric power is also handled as electric power procured by an electric power company.

  In order to carry out such retail sales of electric power, the total amount of electric power received by the plurality of consumers 4 from the electric power transmission line 2 and the amount of electric power procured by some or all of the plural suppliers 1 The same amount of obligation is imposed that the total power procurement amount, which is the total, must be matched within a specified period such as 30 minutes.

Then, the electric power company uses a power procurement planning system 40 (hereinafter, abbreviated as the present system 40) to efficiently achieve the same amount of obligations at the same time for a plurality of suppliers 1. In procuring power of a target power procurement amount corresponding to the total power reception amount from a part or all of it, the power procurement amount by each supplier 1 can be planned.
Hereinafter, a detailed configuration of the system 40 will be described.

  And this system 40 communicates with the communication part of the electric power meter 5 of each consumer 4 via the communication networks 3 such as the Internet, and the above-mentioned specified period band measured by the electric power meter 5. It is configured to acquire an actual actual power reception amount every fixed period such as 5 minutes.

  The power generation control unit 13 provided in the power plant 10 is configured to control the power generation output of the power generation facility 12 according to the power generation plan received from the system 40 via the communication network 3.

This system 40 is composed of a computer system capable of communicating with each supplier 1 side and each customer 4 side via the communication network 3, and uses a computer system hardware resource to perform a predetermined process. By executing the computer program, it is configured to function as a power procurement amount planning unit 41 that executes a planning process to be described later.
Further, in this system 40, a supplier information database 42 that stores supplier information for each of a plurality of suppliers 1 used in the above-described planning process is constructed by a storage means such as a non-volatile storage device. .

  As the supplier information for each supplier 1 stored in the supplier information database 42, state-specific cost characteristic information (cost characteristic information), state-to-state transfer enable / disable information, state-specific adjustment limit information, state-specific duration time The limit information will be described below, and specific examples of each of the above information of the power plant 10, the power trading market 20, and the power company 30 as the suppliers 1 will be described.

  In the following description, a supplier variable for identifying each P supplier is p (p is an integer of 1 or more and P or less), and Kp states that a certain supplier p can take are identified. The state variable for this is k (k is an integer between 1 and Kp). Further, as the state variable k, i represents a state variable immediately before procurement, j represents a state variable at the time of procurement, and each state that a certain supplier p can take is S_pk.

By the way, as a plurality of states that the power plant 10 can take,
A completely stopped state in which the power generation facility 12 is completely stopped;
An activation process state for performing the activation process of the power generation facility 12,
A standby processing state in which the generated power of the operating power generation facility 12 is kept on standby without being supplied to the transmission line 2;
A power transmission state in which the generated power of the operating power generation facility 12 is supplied to the transmission line 2, and
A stop process state for stopping the power generation facility 12, and
A turning state in which turning of the power generation equipment 12 is performed (in order to prevent the drive shaft of the turbine rotor or the like from being bent, the drive shaft is rotated at a low speed),
6 states can be enumerated.

On the other hand, as a plurality of states that the power trading market 20 can take,
Since it is a time zone other than the time zone for delivering electric power to the electric power company, it is impossible to procure electric power to the electric power company,
Since it is time to deliver power to the electric power company, it is possible to supply power to the electric power company.
The following two states can be given.
In addition, when the electric power is procured by a plurality of transactions (forward transactions, spot transactions, etc.) having different transaction forms in the power transaction market 20, each transaction can be handled as another power transaction market 20.

On the other hand, as a plurality of states that the electric power company 30 can take, for example, the electric power company supplies the electric power company with electric power equal to or less than the contracted power amount in the contract time zone, and the charge is composed of a basic charge and a metered charge Assuming that the power company and the electric power company have signed a contract,
Since the procurement time is outside the contract time zone, it is impossible to procure power because it is impossible to supply power to the electric power company.
The procurement time is a contract time zone, and no electricity is supplied to the electric utility.
In-contract procurement status where power can be supplied to the electric power company within the contract time zone when the procurement time is within the contract power amount, and
Non-contracted procurement status that can supply power to the electric utility company when the procurement time is contract time but exceeds the contracted power amount,
The four states can be listed.

[Cost characteristic information by status]
The state-specific cost characteristic information is cost characteristic information indicating the characteristic of the cost with respect to the amount of power procurement (the amount of power supplied to the transmission line 2), and further, with respect to the amount of power procurement for each state S_pk that a certain supplier p can take. This is information indicating the cost characteristics.
That is, as the cost characteristic information by state, as shown in Table 1 below, a procurement cost function CS_p1 (in order to transmit power of the amount of power procurement V_p in a certain state S_pk at a duration T_p as shown in Table 1 below. V_p, T_p) and a penalty cost function CP_p1 (V_p, T_p) that is necessary when power of the power procurement amount V_p cannot be transmitted in the duration T_p in a certain state S_pk as the supplier information database 42 is stored for each supplier 1.

  In addition, although the procurement cost function and penalty cost function described above are functions using the power procurement amount V_p to be procured according to the state and the duration T_p maintained in that state as variables, only the power procurement amount V_p is separately provided. It is also possible to use a function having a variable as a variable, or a function having another value as a variable (for example, a time zone in which the variable is set).

[Status transition information]
The inter-state transfer enable / disable information is information indicating whether transfer is possible between a plurality of states S_pk that a certain supplier p can take.
That is, as shown in Table 2 below, assuming a transition from a state S_pi immediately before procurement of a certain supplier p to a state S_pj at the time of procurement, and setting the availability variable SH_pij indicating whether the migration is possible or not to 0 In the form indicating that the transition is possible by setting the availability variable SH_pij to 1, the value of the availability variable SH_pij as the status transition availability information is the supplier information. Each supplier 1 is stored in the supplier information database 42.

  For example, as shown in Table 3 below, the power generation facility 12 is in a complete stop state, a start process state, a standby process state, a power transmission state, a stop process state, and a turning state as shown in Table 3 below. Since the operation state can be taken in order, it is possible to change the state in that order and to change to the same state, and further to change from the power transmission state to the standby state, and from the standby state to the power transmission state and the stop processing state. Transition to the turning state without intervention is possible, and transition information between states can be generated in such a manner that transition between other states is impossible.

In addition, regarding the information on whether or not the power transaction market 20 can be shifted between states, in the power transaction market 20 by forward transaction, the transition from the procurement impossible state to the procurement possible state and the reverse transition, and the transition to the same state Generates information on whether to allow transition between states in a form that is always possible. On the other hand, in the power trading market 20 by spot trading, although it is possible to shift from a procurement unavailable state to a procurement available state, a procurement unavailable state is possible. The transition from state to state and the transition from the procurement ready state to the procurement unavailable state are impossible, and the inter-state migration availability information can be generated.
In addition, regarding the status information on whether or not the power company 30 can move between states, the procurement state, the procurement state, the in-contract procurement state, the transition from one state to another or the same state, and the non-contract procurement state to the non-contract procurement Although the transition to the state is always possible, the transition information between the states can be generated in a form in which the transition from the non-contracted procurement state to another state is impossible.

[Adjustment limit information by condition]
The state-specific adjustment limit information is information indicating the adjustment limit of the power procurement amount V_p for each of a plurality of states S_pk at a certain supplier p.
That is, as the adjustment limit information by state, as shown in Table 4 below, in a certain state S_pk, the maximum power procurement amount VU_pk (T_p) that can be procured in the duration T_p and the minimum power procurement amount that should be procured in the duration T_p The adjustable range of the power procurement amount V_p defined by VL_pk (T_p) is stored as the supplier information for each supplier 1 in the supplier information database 42. Further, in a certain state S_pk, the duration T_p The maximum adjustment rate VC_pk (T_p) of the power procurement amount that can be changed in the above is stored for each supplier 1 in the supplier information database 42 as the supplier information.

[Duration limit information by state]
The state-specific duration limit information is information indicating the limit of the duration T_p of the same state for each of a plurality of states S_pk at a certain supplier p.
That is, as the duration limit information for each state, as shown in Table 5 below, the lower limit of the duration T_p in which the state S_pk can be continuously continued in the state S_pk when the power procurement amount V_p is procured. The allowable range of the duration T_p defined by the minimum duration TL_pk (V_p) and the maximum duration TU_pk (V_p) which is the upper limit of the duration T_p is stored in the supplier information database 42 as the supplier information. Stored for each supplier 1.

  In the present embodiment, the supplier 1 is the power plant 10, the electric power transaction market 20, and the electric power company 30, and detailed examples of the various supplier information are shown. Modifications can be made in view of the state of each supplier 1 or the relationship between states.

  Next, a detailed configuration of the power procurement amount planning unit 41 in which the system 40 functions will be described.

  The power procurement amount planning means 41 in which the system 40 functions uses the past actual power reception amount measured by the electric power meter 5 of each customer 4 and uses the same amount of the same amount such as 30 minutes at the time of power procurement on the next day or the like. Predict the total amount of power received by each customer 4 per specified time as the total predicted power reception amount, set the total predicted power reception amount to the target power procurement amount Vneed to be procured at the time of procurement, and execute the planning process. The power procurement amount V_p by each supplier p at the time of procurement is planned.

  Specifically, the power procurement amount planning unit 41 determines the procurement status S_pj of each supplier p in the planning process immediately before the procurement recognized from the inter-state transferability information stored in the supplier information database 42. The above procurement is performed while satisfying the constraint conditions including the transition constraint condition that can be migrated from S_pi, and setting the total power procurement amount V_p that is the sum of the electricity procurement amounts V_p by each supplier p as the target power procurement amount Vneed. For the purpose of minimizing the total cost C which is the sum of the costs CS_p1 (V_p, T_p) + CP_p1 (V_p, T_p) of each supplier p recognized from the cost characteristic information stored in the destination information database 42, The power procurement amount V_p by each supplier p is planned.

  Then, as shown in the following equation 1, the total cost C of the plurality of suppliers p is transferred to the cost CS_p1 (V_p, T_p) + CP_p1 (V_p, T_p) of each supplier p as the migration constraint condition. By multiplying SH_pij and summing up, the transition constraint can be obtained in a form that satisfies this condition. On the other hand, as shown in Equation 2 below, the total power procurement amount V of a plurality of suppliers p is summed after multiplying the power procurement amount V_p of each supplier p by the migration availability variable SH_pij, thereby making this transition constraint It can be determined in a form that satisfies the conditions.

Accordingly, the power procurement amount planning means 41 uses the total power procurement amount V as the target power procurement amount Vneed in order to efficiently achieve the same amount of obligation at the time of procurement and to economically procure power in the planning process. In addition to minimizing the total cost C and finding the solution of the power procurement amount V_p of each supplier p by mathematical programming, etc., the obligation of the same amount at the time of procurement can be efficiently achieved and economical The power procurement amount V_p of each supplier p that can procure power is planned.
Then, the power procurement planning system 40 uses, for example, the power procurement amount planned for the power generation control unit 13 of the power plant 10 based on the power procurement amount of each supplier p planned as described above. In the form of outputting a power generation plan that causes the power generation facility 12 to generate power, each supplier 1 is configured to procure electric power of the amount of power planned by the planning process at the time of procurement.

  Furthermore, the power procurement amount planning unit 41 can be configured to execute a planning process by adding an adjustment constraint condition or duration constraint condition described later as a constraint condition in addition to the transition constraint condition, A description will be given of the case of such a configuration.

The power procurement planning means 41 recognizes the adjustment state of the power procurement amount V_p by each supplier p in the procurement state S_pj from the adjustment limit information classified by state stored in the supplier information database 42 as a constraint condition. The planning process can be executed by adding an adjustment constraint that does not deviate from the adjustment limit of the procurement state S_pj.
As shown in Equation 3 below, the adjustment restriction condition is that the power procurement amount V_p in the procurement state S_pj of each supplier p is stored in the supplier information database 42 as adjustment limit information for each state. The adjustment rate VC_p in the procurement state S_pj of each supplier p is equal to or less than the maximum adjustment rate VC_pj (T_p) that is equal to or greater than the amount VL_pj (T_p) and within the range of the maximum power procurement amount VU_pj (T_p). The condition is added to the constraint condition in the planning process as the adjustment constraint condition.

Further, the power procurement planning means 41 recognizes the adjustment state of the duration T_p of each supplier p in the procurement state S_pj from the state-specific duration limit information stored in the supplier information database 42 as a constraint condition. The planning process can be executed by adding a duration constraint that does not deviate from the duration limit of the procurement state S_pj.
As shown in the following equation 4, the duration constraint condition is that the duration T_p of the procurement state S_pj of each supplier p is the minimum continuation stored in the supplier information database 42 as duration limit information by state. The condition that the time duration is not less than the time TL_pj (V_p) and is within the range of the maximum duration TU_pj (V_p) is added to the constraint condition in the planning process as the adjustment constraint condition.

  In addition to the above-mentioned conditions, the constraint conditions in the above-described planning process are the limits that the generated heat amount, generated steam amount, generated exhaust gas amount, etc. of the power generation facility 12 at the time of procurement are stored in the supplier information database 42 as supplier information. Restrictions that do not deviate from the above may be added.

  The power procurement planning system according to the present invention is economical in considering the state of each supplier when procuring a target amount of electricity from some or all of a plurality of suppliers such as power plants and power trading markets. In addition, it can be effectively used as a power procurement planning system that can efficiently plan the amount of power procurement by each supplier.

Schematic configuration diagram of power procurement planning system

Explanation of symbols

1: supplier 2: transmission line 4: customer 3: communication network 40: power procurement planning system 41: power procurement plan 42: supplier information database

Claims (4)

A power procurement planning system for planning a power procurement amount by each of the suppliers when procuring a target power procurement amount from a part or all of a plurality of suppliers,
As the supplier information for each of the plurality of suppliers, cost characteristic information indicating the characteristics of the cost with respect to the amount of power procurement, and inter-state transition availability information indicating whether transition between the plurality of states that the supplier can take is possible. Stored supplier information database,
Restriction conditions including a transition restriction condition that makes it possible to shift the procurement state that is the state at the time of procurement of each of the suppliers from the immediately preceding procurement state that is the state immediately before the procurement recognized by the inter-state transition availability information The total cost that is the total of the costs of each supplier recognized from the cost characteristic information while satisfying and using the target power procurement amount as the total power procurement amount that is the total amount of power procurement by each supplier A power procurement planning system comprising power procurement amount planning means capable of executing a planning process for planning a power procurement amount by each of the suppliers for the purpose of minimizing power consumption. The supplier information database stores, as the cost characteristic information, state-specific cost characteristic information indicating the characteristic of the cost with respect to the power procurement amount for each of the plurality of states,
2. The power procurement according to claim 1, wherein the power procurement amount planning unit obtains, as the total cost, a total cost in the procurement state of each of the suppliers recognized from the state-specific cost characteristic information in the planning process. Planning system. The supplier information database stores, as the supplier information, state-specific adjustment limit information indicating an adjustment limit of the power procurement amount for each of the plurality of states,
In the planning process, the power procurement amount planning means does not deviate from the adjustment limit of the state at the time of procurement recognized from the adjustment limit information for each state, as the restriction condition in the planning process. The power procurement planning system according to claim 1 or 2, wherein an adjustment constraint condition to be added is added. The supplier information database stores state-specific duration limit information indicating the duration limit of the same state for each of the plurality of states as the supplier information,
In the planning process, the power procurement amount planning means recognizes the duration of the procurement state by each of the suppliers from the duration limit information according to the state as the constraint condition. The electric power procurement planning system according to any one of claims 1 to 3, wherein a duration restriction condition that does not deviate from is added.

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