JP2002044864A - Method and service system for supplying power - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable customers to select a power supplier freely as they like and receive power. SOLUTION: A power system network interconnects a plurality of power suppliers and customers, adjusts an amount of power generated by the power suppliers based on an amount of power demanded by the customers changed in real time and supplies power to the customers. A power supplier is selected from a plurality of power suppliers, receives an amount of power demanded by customers and supplies power in response to the demand from the customers. The demanded amount of power is supplied from the selected power supplier to the customers through the power system network based on an instruction from a power supplying service center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to power supply and demand control, and more particularly to a power supply method and a power supply service system in which a power supplier supplies power to a customer in response to a request from the customer.

[0002]

2. Description of the Related Art Conventionally, when power is supplied, it has been usual to receive power from a power supplier that can be established in a region or the like. In other words, the power consuming customers have been receiving power supply from predetermined vertical integrated power companies.

As a prior art closest to the present invention, T.I. M. Athey, “Generation S
scheduling and Control ”(Pr
receiveds of the IEEE, Vo
l. 75, NO. 12, pp. 1592-1606, D
1987). The described technology detects a power system frequency deviation, estimates a demand imbalance amount based on the deviation, and adjusts a power generation amount to eliminate the demand imbalance amount. This ensures the balance of the entire system.

[0004]

The above-mentioned prior art is a supply / demand balance control by a vertically integrated power company in the entire power system, and it is described that the imbalance amount of the entire system appears as a frequency deviation. This is a method that eliminates the imbalance in supply and demand by making the frequency deviation close to zero by using this method. This method is one of the effective ways to solve the imbalance in supply and demand of the whole system. However, when a certain power consuming customer receives a power supply from a certain power supplier connected to the power system, the conventional technology cannot be applied as a control method for matching the supply with the demand. This is because the frequency deviation only reflects the supply and demand imbalance of the entire system, and does not reflect the supply and demand balance between a specific customer and a specific power supplier as described above.

[0005] Conventionally, while a power supplier is determined to receive a power supply, for example, a power company, the power consumer is supplied with the power, and the power is supplied in response to a request from the power consumer. There was a place where it was hard to say that it was a power supply system.

The present invention provides a method for receiving power from a power supplier in response to a request from a power consumer and a power supply service system, that is, a method for matching the amount of power required by a power consumer with the amount of power supplied. And to provide a service system.

[0007]

SUMMARY OF THE INVENTION The present invention is characterized by a method of supplying power to a power consuming customer from a power supply service center or a power generation side, and a power supply service system.

Specifically, it has a power system network connecting both a power supplier (generally a plurality) and a power consuming customer, and adjusts the power generation amount of the power supplier according to the demand of the customer which changes with time. In the power supply method of supplying power to the demand side, a power supply request amount from a power consuming customer is received, and a power supply supplier that supplies power in response to the demand side customer request is selected from among the power suppliers. The method is characterized by a method of supplying electric power according to a required amount from the selected electric power supplier to the demand-side customer via the electric power system network. Further, receiving a power supply request amount from a power consuming customer, selecting a power supplier that supplies power according to the request of the demand side customer from the power suppliers,
It is characterized in that the power supply service center instructs the selected power supplier to supply the requested power to the demand side customer. The power supply service center performs a billing operation on the power consuming customer in accordance with a record and contract of power supply, and charges the power consuming customer a power fee. Is characterized in that it includes a power supply unit having a backup power generation unit in addition to the main power generation unit.

A demand-side power supply request amount receiving unit;
A power supplier selection unit for supplying power to the demand from a plurality of power suppliers (generally a plurality) in response to the demand on the demand side; and the power system from the selected power supplier to the demand request side. And a power supply network for supplying power via a network.

[0010]

FIG. 1 is an overall configuration diagram of a power supply control system according to the present invention. FIG. 1A is an overall configuration diagram including a power system and a power supply service center. Reference numeral 10 denotes a plurality of power consuming customers who receive power supply, and in this case, the power consuming customers are constituted by customers CLp (CL1 to CLi to CLp). Reference numeral 20 denotes a power generation side that supplies power, and includes a plurality of power suppliers (hereinafter, referred to as power supply units) Pn (P1 to P1) such as a conventional power company and other power generation power suppliers.
Pi to Pn). S is a power system network, which is generally a power system managed and operated by a conventional power company. PCC stands for Power Supply Service Center, and based on a contract with a Power Supply Service Center (hereinafter abbreviated as PCC) based on the customer's request, the customer's request and thus a plurality of power supplies or a single power supply. Supply electricity to customers.

Reference numeral 12 denotes an Internet line between the PCC and the customers CL1 to CLp. However, there is no problem as long as it is a communication line, and it may be an Internet line or a dedicated line or a public line. Reference numeral 14 denotes an Internet line between the power supply unit and the PCC, but any communication line may be used as described above.
It may be a dedicated line or the like. L1 to Li to Lp are watt hour meters for measuring the amount of power consumption on the customer side. Generally, the amount of power is measured at a predetermined cycle, and data is collected in the PCC via the Internet 12. For example, data is collected at 5-minute intervals, and control is performed while maintaining the value until data is collected in the next cycle. In some cases, data is collected on the condition that the deviation between supply and demand exceeds a predetermined threshold value, that is, at an irregular cycle. That is, normally, the power generation amount is fixed, and each integrated value of the power generation amount and the demand amount (kwh
Value) is adjusted to a demand value by adjusting the power generation amount (kw value) at that time only when the deviation of the value exceeds a predetermined value (for example, 2% or more), and the deviation again becomes the predetermined value. Until that time, maintain that power generation.

On the other hand, P1 to Pi to Pn are power generation watt-hour meters for measuring the power generation amount on the power generation side, which measure the power amount at a predetermined cycle, and output the data to the PCC via the Internet 14. Collected. Reference numerals 16 and 18 denote transmission / reception lines for transmitting and receiving information between the PCC and the customer or between the PCC and the power supply unit, and are used for mutually exchanging billing of power usage charges and other information. Or any communication line as described above). Power consumption customer side (CL1-
The measured power consumption values (L1 to p) from n) are the power supply side, for example, G as the power supply side for the customer CL1.
If i is selected, as shown in FIG. 1B, the electric energy L1 is transmitted to the Gi side and the Gi controller 19i (CTR) is set so that the difference between Pi and L1 becomes zero.
The control is performed by. Control is performed when the value exceeds a predetermined value as described above.

The power supply unit includes, of course, a conventional power company, but also includes a nuclear power plant, a thermal power plant, a wind power plant, a solar power plant, and the like. There are various types such as capacity generation.
FIG. 2 shows the characteristics of the power supply unit. Gmax is the maximum amount of power that can be generated in each power supply unit, and G1m for G1
ax, Gi, and Gn are represented by Gimax and Gnmax, respectively. This is comparable to the installed capacity of the power supply. On the other hand, the suppliable power amount g that can be generated at the present time is changing every moment. An example is shown in FIG. FIG. 3A shows the case of the power supply unit G1 at time t _1.
In the amount of power that is supplied with g _11, it represents that it is possible to supply the amount of power remaining g ₁ m _(1). The amount of power being supplied at t ₂ is g _12, the amount of power being supplied at t ₃ is a g _13, respectively supplied electric energy is _{g 1 m (2), g} 1 m (3 ₎ . FIG. 3B is for Gi, and the electric energy at the times t ₁ to t ₃ has the same meaning as in FIG. 3A. If FIG. 3 is displayed on the monitoring screen of the control center, it is useful that the supervisor can instantly grasp the power supply and demand situation.

As described above, since the amount of power generated varies depending on the load pattern of the power consuming customer, in order to reduce the power rate as much as possible, it is necessary to consider how the load of the customer is borne by a plurality of power supply units. Whether or not it is good is determined by the PCC, and in some cases, control is performed so that the load is shared by a plurality of power supply units. The starting time in FIG. 2 is the time required to rise from zero load to a predetermined output. G1 is T1 and Gi is Ti. The column of the configuration of the generator indicates the device configuration of the power supply unit. In the case of G1, it indicates that it has a device configuration such as thermal power generation, gas turbine power generation, and wind power generation. Gi is nuclear power,
It indicates that the system is composed of solar thermal power generation and the like, and that Gn is composed of hydroelectric power generation and nuclear power generation. The next column in FIG. 2 shows the presence or absence of a backup generator.
1, Gi has a backup generator, but Gn has no backup generator. The other columns are information on each of the n power supply units, for example, information such as periodic inspection information and the date of completion of equipment repair.

FIG. 4 shows the characteristics of the power consuming customer.
In FIG. 4A, although the type of business is the type of business, the power consumption increases for a predetermined time from the start, such as a manufacturing factory or an office building, as in CL1, and the power consumption is extremely low after the employee leaves the company. The form of power consumption, such as in the case of a customer CLi, such as when the power consumption during the daytime is not so large, but the power consumption is large from evening to midnight, such as in the case of a CLp such as an apartment complex. Can be divided by In FIG. 4A, Lmax is the maximum amount of power consumed by the customer, and CL1 is L1ma.
x and CLi are represented by Limax, and CLp is represented by Lpmax or the like. The type of contract content in the next column is, for example,
As shown in (B), the type B is a contract with extra charge for the excess power, the case C is a contract with a guaranteed power supply for a specific time zone, the contract A is a voltage or frequency fluctuation permitting, And so on. The next column in (A) of FIG. 4 indicates whether or not the load pattern is periodically corrected (for example, according to the season). If yes, information such as the timing is stored. In the other fields, the scheduled holidays of the power consuming customers and the like are often input.

FIG. 5 schematically shows the configuration of a power supply service center PCC composed of a computer or the like. The characteristics of the power supply unit shown in FIG. 2 are stored in the database 32 of the database management unit 30. 4 are stored in the customer database 40. The database management department is also responsible for customer power consumption data 3
8, billing data 36, power supply amount data 3 on the power supply side
4. Further, the power supply unit and each power supply amount management unit 52 manage the power supply side. The contract customer authentication unit 58 and the customer-specific power consumption management unit 56 manage the customer. Reference numeral 60 denotes a display unit on which a charge calculation result and a customer's power use state can be displayed and confirmed. These operations will be described below with reference to a processing flow.

FIG. 6 shows a processing flow in response to a request from a customer transmitted over the Internet or the like.
In step S2, a request for power supply and demand from the customer is received. In step S4, it is confirmed whether the customer has already contracted with the power supply service center. You can check it with your contract number or password. If it is determined that the customer is an uncontracted customer, a contract is urged in step S6, and the format of the contract application is returned to the customer. On the other hand, if the customer is a contracted customer in step S4, it is determined in step S8 whether the current power supply / demand request is a power demand based on the contract. If the power is based on the contract, it is determined that power can be supplied in step S10, and power is distributed and supplied in step S18. This is performed by the power supply amount management unit 52 in FIG. 5, which will be specifically described later (FIG. 7). If it is determined in step S8 that the amount of power is out of the contract, the power supply unit determines in step S12 whether power can be supplied. For example, as shown in FIG. 3, it is determined whether or not the power can be supplied, including the power supply time, by looking at the current possible power supply amount. Step S if possible
The distribution and supply of electric power are performed at step 16 (specifically, step S18). If it is determined in step S12 that power supply cannot be performed, a response is made in step S14 to the customer that power that is not currently contracted cannot be supplied.
In this case, it is not possible at the present time in consideration of load fluctuation and the like.

FIG. 7 shows the power supply management unit 52 in FIG.
FIG. 3 is a flowchart for explaining distribution and supply of electric power in FIG. A step S22 takes in the amount of electric power required from the customer. For example, the signal from step S18 in FIG. 6 that has been authenticated by the customer is fetched. In step S24, the current power supply amount of the power supply unit is grasped. It is Pi to P taken at a predetermined cycle in FIG.
n, which can be realized by looking at the contents of the power supply unit management data 32. In step S26, the amount of power that can be supplied at the present time is grasped. This can be realized by looking at the contents of the power supply amount data 34 in FIG. In step S28, it is checked whether or not all power supply units have been completed. Next, in step S30, it is confirmed whether or not there is a designation from any of the power supply units G1 to Gn to which power is to be supplied from the power consuming customer CLp. If there is no particular designation, in step S32, the power supply is allocated and distributed from the larger power supply amount obtained in S26. On the other hand, if the power supply unit is specified by the customer in S30, it is determined in step S34 whether or not power can be supplied with the "specified Gn" from the current power supply available power obtained in S26. If possible, the power supply is distributed by the “designated Gn”. When it becomes impossible, only the “Gn that has become impossible” in step S38 is distributed to another power supply unit to supply power.

FIG. 8 is a process flow for explaining a process of charging a power consuming customer. In step S42, the power consumption for each customer for a predetermined period, for example, one month, is obtained.
This is determined by looking at the contents of the power consumption database 38 in FIG. In step S44, it is checked whether or not the power amount is based on the contract type. In this case, in step S46, in addition to the total power amount, it is also checked whether the maximum power amount has been exceeded or the minimum power amount has not been reduced during this period, and is considered in the accounting calculation. Items to be considered for charging include a power charge according to the actual power consumption, a contract basic charge according to the maximum power (kw), a surcharge according to the deviation of the actual power consumption from a planned value, and renewable energy. An extra fee depending on the use, a renewable energy use incentive, a load leveling discount, a penalty fee depending on the number of times the contract basic fee is exceeded, and the like are considered.

If the contracted power amount has been exceeded, the power usage history is checked in step S48. When the power consumption during the period exceeds the contract value, a surcharge calculation for the non-contract power amount is performed in step S50. In step S52, it is checked whether or not the billing calculation has been completed for all the customers. If the calculation has been completed, the calculation result of the power rate for each customer is output and displayed in the form of an invoice, and after confirmation, electronically sent to the customer. I can do it.

FIG. 9 shows a processing flow for explaining the calculation of the power fee to be paid to the power supply unit. In step S62, the power supply amount of each power supply unit for a predetermined period, for example, one month, is obtained. Specifically, it can be grasped by looking at the power supply amount database 34 of FIG. In step S64, it is determined whether or not the total electric power is within the contract form. If the contract amount is within the contract, a payment fee based on the contract is calculated in step S66. Also,
When the amount of power exceeds the contract, the history of the power supply during the charge calculation period is checked in step S68, and the part outside the contract is clarified. Thereby, the power rate is calculated in step S70 by a predetermined rate calculation. In this case, the charge is calculated in consideration of whether a backup power supply, for example, a generator is used due to insufficient power. Step S72
Then, it is confirmed whether the calculation has been completed for all of the power supply units G1 to Gn. In step S74, the used amount of the system used to supply power to the customer is calculated. Generally, it is often a fixed amount, but it is determined by ranking according to the number of customers or the number of power supply units. As a result, the payment fee for each power supply unit or the amount of system usage for a company that manages and holds the system (generally a power company is often used) is calculated, and the price table is displayed in step S76. . In many cases, one of the electric power suppliers manages and holds the grid, so that the electric power supplier has a grid usage calculation system, and can calculate the usage and request the usage to the power supply service center.

FIG. 10 shows data referred to in the charge calculation. This is data registered in advance in the charging database of FIG. FIG. 10A shows a change in the power rate F according to, for example, a calendar month. The fee calculation is performed with reference to these. FIG. 10B shows a time-based power rate F, and late-night power is relatively cheap. Figure 1
(C) of 0 is an example relating to the power rate F for the continuous operation time, and indicates that the power rate is relatively lower in the case of, for example, 24-hour operation than in the case of short-time use. FIG. 10 (D) shows the case of a nuclear power plant,
Alternatively, the fee F differs depending on thermal power generation, hydroelectric power generation (a1 to a5), and the like. The data in FIG. 10 is stored in the billing database 36 and is used for billing calculation.

FIG. 11 shows a modification of the present invention, in which a load is predicted and a power supply unit is controlled. Reference numeral 80 denotes a load prediction unit that predicts load fluctuations with reference to the customer's contract status of received power, past power usage results, and the like. The power generation amount is adjusted in accordance with the predicted demand value so that the power generation amount can follow a sudden change in demand such as rising in the morning or falling in the daytime. As a method of demand forecast, there are various ways of determining the forecast value, such as using the demand forecast value of the previous day as it is, or correcting the demand forecast value of the previous day according to the result of the day.

Reference numeral 82 denotes distribution means for controlling the distribution of the prediction results to the respective power supply units G1 to Gn. The load prediction may be a method of predicting the load for each customer, summing it up for all customers, and distributing it. If there is a power supply unit specified by the customer, predictive control of the power supply unit is performed within an allowable range. The predicted command value to each power supply unit is represented by [L1] to [Lp]. Control devices (CTR) 84, 85, and 86 are G1 to Gn control devices based on predicted values, respectively.

FIG. 12 shows a control processing flow of the load prediction section 80 and the load distribution section 82. In step S80, the current received power amounts L1 to Lp are fetched. There are two types depending on whether the total power consumption is predicted or the load is predicted for each customer. One is the prediction of the full load, and the prediction is performed in step S82. In that case, prediction is performed based on past performance data. On the other hand, in step S83, prediction is made from past results for each individual customer. There are various prediction methods. For example, various methods can be applied, such as calculating a deviation between a plurality of past data and data taken in this time, and predicting a load at the time of next data collection from a tendency of the magnitude of the deviation. In step S84, each G
The target value to be distributed to n is calculated, and in step S85, control is given to each control device (CTR) 84, 85, 86 as a predicted value.

FIG. 13 shows a modification of the configuration of the power supply unit. FIG. 13A shows that the power supply unit G1 is G
This is the case of a power supply unit composed of three generators a, Gb and Gc. In particular, Gb has a backup generator Gd. The power supply amount is P1 with respect to the load request L1 from the power supply service center PCC, and the control device 60 on the G1 side controls its own Ga, Gb, Gc control device (CTR).
61, 62 and 63, target values Paa, Pba, P
The output is controlled by feeding back the output powers Pa, Pb, and Pc. The backup generator Gd has two options: to back up when Gb fails or to make up for the shortage when the output power becomes insufficient. The command from the distribution CTR is Pda, and the output Pd is fed back to perform control. Figure 1
3 (B) is a group of Gi1, Gi2, Gi3 and Gi
Is shown.

FIG. 14 shows that the backup agent 70 has G1 to G
This is a configuration in a case where all n backups are undertaken. 64, 65 and 66 are control devices for G1, Gi and Gm. The power supply control device is collectively represented as 67,
In this configuration, a backup request signal 68 is transmitted to a control device 78 of a backup company. The backup side distributes the request to GB1 to GB3 and outputs the request. PB1 to PB3 are output values, and 72 to 74 are control devices for GB1, GB2, and GB3, respectively. SB1 to SB3 are output switches of the respective generators, and SB0 is an output switch of the entire backup power. In such a case, the billing of the power fee may be made by the backup company 70 to the PCC or directly to the power consuming customer.

[0028]

According to the present invention, a power consuming customer can receive only a necessary amount of power from a power supplier who desires power when needed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a power supply service system.

FIG. 2 summarizes characteristics of a plurality of power supply units.

FIG. 3 is a diagram illustrating a power generation state of a power supply unit and a transition of an available power supply amount at a current time.

FIG. 4 is a table summarizing characteristics of a power consuming customer.

FIG. 5 is a diagram showing an outline of a configuration of a power supply service center.

FIG. 6 is a flowchart for explaining processing of a contract customer authentication unit in FIG. 5;

FIG. 7 is a flowchart for explaining processing of a power supply unit management unit in FIG. 5;

FIG. 8 is a flowchart for explaining processing for a customer by a charging management unit in FIG. 5;

FIG. 9 is a flowchart illustrating a process for a fee paid to a power supply unit by a charging management unit in FIG. 5;

FIG. 10 is a diagram illustrating an example of a power rate.

FIG. 11 is a diagram illustrating a block configuration of control of a power supply unit for predicting power consumption.

FIG. 12 is a flowchart illustrating a full load prediction and a load prediction control for each customer in FIG. 11;

FIG. 13 is an explanatory diagram of a case where a power supply unit has a backup facility and a case where a plurality of power supply units constitute one power supply unit.

FIG. 14 is a configuration diagram in the case where a power backup company exists.

[Explanation of symbols]

10; power consumption customer; 20; power supply unit; 30; database management unit;
6, 18; transmission / reception line (internet line), 32;
Power supply unit management data storage unit, 36; charging data storage unit, 38; power usage data storage unit, 40; customer data storage unit, 52; power supply unit power supply amount management unit, 54; charging management unit, 56; Customer-specific power consumption management unit, contract customer authentication unit, 60; control device, 61, 62, 63; Ga, G
b, Gc control devices, 64, 65, 66; G1, Gi,
Gm control device, 67; power supply control device, 70; backup trader, 78; backup control control device (B.
U. CTR), 72, 73, 74; control devices for backup generators GB1, GB2, GB3; 80; load prediction unit; 82; load distribution means; S; power grid, PCC;

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Chihiro Fukui 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Inside the Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Mario Uesugi 5-chome, Omika-cho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd. Information Control System Division (72) Inventor Harumi Uchigasaki 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Within Hitachi Research Laboratory, Hitachi, Ltd. (72) Nobuhisa Kobayashi Ibaraki 1070 Ma, Hitachinaka City, Prefecture F-term in Mito Building System Division, Hitachi, Ltd. Building System Group (Reference) 5B049 AA06 BB14 EE31 5G066 AA02 AA05 AA20

Claims (10)

[Claims] An electric power supply network is provided for connecting both an electric power supplier and an electric power consuming customer, and the electric power generated by the electric power supplier is adjusted in accordance with the demand amount of the customer which changes with time to supply electric power to the demand side. Receiving a power supply request amount from a power consuming customer, selecting a power supplier that supplies power in response to a request from the demanding customer from the power suppliers, and selecting the selected power supply. A power supply method, comprising supplying a power according to a required amount from a trader to the demand side customer via the power system network. 2. The power supply system according to claim 1, further comprising: receiving a power supply request amount from a power consuming customer; A power supply method comprising: instructing a selected power supplier to supply power requested to the demand side customer from a power supply service center, and supplying power via the power system network. . 3. The power supply service center according to claim 2, wherein the power supply service center performs a billing operation on the power consuming customer in accordance with a result of power supply and a contract, and bills the power consuming customer for a power fee. Characteristic power supply method. 4. A power supply method according to claim 1, wherein the power supply unit of the power supply company includes a power supply unit having a backup power generation unit in addition to the main power generation unit. 5. An electric power system for connecting an electric power supplier and an electric power consuming customer to each other, wherein the electric power generation amount of the electric power supplier is adjusted according to the demand amount of the customer which changes with time, and the electric power is supplied to the demand side. In the power supply system, a demand-side power supply request amount receiving unit, and a selection unit that selects a power supplier that supplies power to the request from the power suppliers in response to the demand-side request, A power supply network for supplying power from the selected power supplier to the demand requesting side. 6. The power supply system according to claim 5, wherein a power supply request amount from a power consuming customer is received, and a power supply company that supplies power in response to a request from the demand side customer is selected from the power supply companies. A power supply service center, comprising: a selection unit that performs the above operation; and a command unit that instructs the selected power supplier to supply the requested power to the demand side customer.
And a power supply service system for supplying power to a power consuming customer. 7. The power supply service system according to claim 5, wherein the power supply unit of the power supplier includes a power supply unit including a main power generation unit and a backup power generation unit. 8. The power supply service center according to claim 5, further comprising a charging operation unit for charging the power consuming customer in accordance with the result of power supply and a contract, and charging the power consuming customer for a power fee. And a power supply service system. 9. A system for adjusting a power generation amount according to a demand amount that changes with time and supplying power so as to make the power generation amount coincide with the demand amount. Means for measuring the amount of power, means for transmitting the amount of power on the demand side to the power generation side, and power generation provided in the power supply unit on the power generation side and adjusting the amount of power generation based on a deviation between the amount of power demand and the amount of power generation. A power supply service system, comprising: a control device. 10. An electric power supply for adjusting power generation in accordance with a demand amount that changes with time and supplying power so that the power generation amount and the demand amount coincide with each other. Measure the demand using the watt hour meter on the side,
The power generation is measured using the watt hour meter of the power supply unit on the power generation side, and the measured values of the demand and the generated power are transmitted to the control center via the communication line. A power supply method in which a power generation command value is obtained, a control center transmits the power generation command value to a power supply unit on the power generation side via a communication line, and a power generation control device adjusts a power generation amount according to the power generation command value.