Power interchange system and power system

Abstract

To provide a technique of efficiently using power generated from a power sending hub in a power interchange system which sends power from a power sending hub with a photovoltaic power generation system and an electrification apparatus to a power reception hub.SOLUTION: The power interchange system according to the present invention corrects a power generation prediction value on the basis of a power generation predicted value and a power generation change amount of the photovoltaic power generation system, and calculates the interchange power and a charge amount for the electrification apparatus on the basis of the surplus generated power of the photovoltaic power generation system and an allowable charge amount of the electrification apparatus.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a technology for transmitting electric power generated by a solar power generation system provided in a power transmission base to a power receiving base by a power transmission network.

Background Art

[0002] In recent years, the awareness of power suppliers and consumers towards carbon neutrality has been increasing, and power generation systems in which solar power generation (PV: Photo Voltaic) and storage batteries are installed side by side are becoming widely popular. Such a power generation system can be used as a power exchange system in which an operator or the like equipped with power generation facilities supplies (transmits) power to other systems through a power transmission network or the like owned by a power company, or receives power supply from other systems (receives power).

[0003] When implementing power exchange from one or more bases, it is necessary to submit an exchange plan to an operating organization (e.g., a power wide-area operation promotion organization: OCCTO) by before starting power transmission (e.g., the day before). Furthermore, during the implementation of power exchange, it is necessary to transmit power as planned at predetermined time intervals (e.g., 30 minutes). If the actual transmitted power deviates (becomes unbalanced) from the pre-planned power, it is common to be charged an imbalance fee corresponding to the imbalance power.

[0004] Patent Document 1 below describes a technique for adjusting the excess or deficiency of solar power generation. This document aims to "appropriately absorb or supplement the excess or deficiency of generated power in the power grid to which the solar power generation device is connected." Regarding this, "when the prediction start condition is satisfied (YES in S100), the CEMS server executes a process including steps of obtaining a predicted value and reliability of solar irradiance (S102), calculating a predicted value of generated power (S104), when the predicted value of generated power is greater than the required power (YES in S106), and when the reliability of the predicted value is high (YES in S108), setting a first target range (S110), when the reliability of the predicted value is low (NO in S108), setting a second target range (S112), when the predicted value of generated power is less than or equal to the required power (NO in S106), and when the reliability of the predicted value is high (YES in S114), setting a third target range (S116), and when the reliability of the predicted value is low (NO in S114), setting a fourth target range (S118)." (See the abstract).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The power transmission site is equipped with, for example, a solar power generation system as a power generation facility and a storage battery as a power storage facility. The excess power generated by the solar power generation system is stored in the power storage facility or transmitted to the power receiving site. From the perspective of stabilizing the power transmission system, it is desirable that the storage capacity be as large as possible. However, since the price of stationary batteries is generally high, the storage capacity of stationary batteries that can be installed at the power transmission site is limited.

[0007] On the other hand, portable electrified devices such as electric vehicles are also equipped with storage batteries and can be charged at the power transmission base. Since such electrified devices move between bases, although they are not necessarily always charged at the power transmission base, they can potentially increase the chargeable capacity at the power transmission base, substituting for stationary storage batteries.

[0008] In order to suppress the imbalance in power flow, it is desirable that the power generation operation by the photovoltaic power generation system and the charge / discharge commands for the storage battery are interlocked. This is because the excess or deficiency of power generation can be adjusted by the storage battery. However, electrified devices usually belong to a control system different from that of the photovoltaic power generation system (the control system that sends control commands to the photovoltaic power generation system does not have the function or authority to control electrified devices). Then, even if it is possible for electrified devices to supplement the charging capacity of stationary storage batteries, in order to achieve this, it is considered desirable to rely as little as possible on the charging capacity of electrified devices. This is because the charge / discharge commands for electrified devices are not necessarily always freely executable by the control system.

[0009] Conventional technologies such as Patent Document 1 assume charging of vehicles (an example of electrified devices). On the other hand, it is considered that sufficient consideration has not been given to how to handle the fact that the charging capacity of the electrified devices possessed by the power transmission base is not necessarily constant. If the charging capacity of the electrified devices is not considered, the surplus of the generated power will be discarded, which is not desirable from the perspective of power efficiency at the power transmission base.

[0010] The present invention has been made in view of the above problems, and an object thereof is to provide a technology capable of efficiently using the power generated by a power transmission base in a power flow system that transmits power from a power transmission base having a photovoltaic power generation system and electrified devices to a power reception base.

Means for Solving the Problems

[0011] The power sharing system according to the present invention corrects the power generation prediction value based on the power generation prediction value and the power generation fluctuation amount of the solar power generation system, and calculates the shared power and the charge amount for the electrified equipment based on the surplus power generation of the solar power generation system and the allowable charge amount of the electrified equipment.

Effect of the Invention

[0012] According to the power sharing system of the present invention, in a power sharing system that transmits power from a power transmission base point having a solar power generation system and electrified equipment to a power reception base point, the power generated by the power transmission base point can be efficiently utilized. Other problems, configurations, effects, etc. will become clear from the following description of the embodiments.

Brief Description of the Drawings

[0013]

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Modes for Carrying Out the Invention

[0014] <Embodiment 1> FIG. 1 is a block diagram of a power lending system 1 according to Embodiment 1 of the present invention. The power lending system 1 is a system that transmits power from a power transmission base to a power reception base. The power lending system 1 includes an arithmetic unit 11 and a control unit 12. The arithmetic unit 11 calculates a charging amount for charging an electrified device (e.g., a device equipped with a storage battery and not stationary, such as an electric vehicle) owned by the power transmission base, and calculates the power (lent power) transmitted from the power transmission base to the power reception base. The control unit 12 generates a charging command for the electrified device (when passing through a charger, a charging command for the charger) and creates a lending plan.

[0015] The arithmetic unit 11 receives a power generation prediction value and a power generation fluctuation amount of the solar power generation system, and corrects the power generation prediction value [kW] based on these. When correcting, correction value data described later is used. The arithmetic unit 11 calculates surplus power [kW] by subtracting the corrected power generation prediction value from the actual power generation [kW] of the solar power generation system. The arithmetic unit 11 calculates the charging amount [kW] and the lent power [kW] for the electrified device based on the allowable charging amount of the electrified device and the surplus power. The specific calculation procedure of the arithmetic unit 11 will be described again.

[0016] The control unit 12 determines a charging command [kW] and a charging time [min] based on the output limits during charging (the output limit of the charger and the input limit of the electrified device), and calculates the charging amount [kWh] for the electrified device based on these. The control unit 12 outputs a charging command value to the charger based on the calculated charging amount. The control unit 12 creates a lending plan every 30 minutes, for example, based on the lent power calculated by the arithmetic unit 11, and transmits this to the power transmission network (operating organization).

[0017] As operation modes of the power lending system 1, for example, the following ones can be considered. (1) When the above calculations are carried out on the same day as the lending period, the lending plan created by the control unit 12 is sent to the power transmission network at the latest by one hour before the start of lending. The charging command value corresponding to the latest lending plan is transmitted to the charger. (2) When the above calculations are carried out on the day before the lending period, since the operation result cannot be obtained by the calculation unit 11, the command value is calculated based on the lending plan planned on the previous day.

[0018] FIG. 2 is an overall configuration diagram of the power system according to Embodiment 1. The power transmission base includes, in addition to the power lending system 1, a solar power generation system, electrified equipment, a charger, a prediction calculation unit 2, a battery management unit 3, and the like. The prediction calculation unit 2 calculates the power generation prediction value of the solar power generation system, the power generation fluctuation amount of the solar power generation system, and the like, and outputs these to the power lending system 1. The battery management unit 3 manages the storage battery included in the electrified equipment. The battery management unit 3 calculates the allowable charge amount of the storage battery included in the electrified equipment, and notifies the result to the power lending system 1. Details of the prediction calculation unit 2 and the battery management unit 3 will be described later. By combining the power transmission base and the power reception base, the power system according to Embodiment 1 is configured.

[0019] FIG. 3A is a functional block diagram of the prediction calculation unit 2. The prediction calculation unit 2 includes a power generation prediction unit, a fluctuation prediction unit, and a storage unit. The storage unit stores the weather information (predicted values such as cloud amount and solar radiation amount) obtained by the prediction calculation unit 2 from the weather information provider. In addition, the storage unit stores the measured values (actual values) of the output voltage and output current of the solar power generation system respectively, and the power generation actual value [kW] based on these. The power generation prediction unit calculates the power generation prediction value of the solar power generation system. The fluctuation prediction unit predicts the power generation fluctuation amount of the solar power generation system. The prediction calculation unit 2 outputs these values to the power lending system 1.

[0020] FIG. 3B is a functional block diagram of the battery management unit 3. The battery management unit 3 includes an arithmetic unit and a storage unit. The storage unit stores voltage range data (described later) that describes the range of the output voltage from the battery included in the automated equipment. The arithmetic unit acquires the detected values of the output voltage and output current from the battery included in the automated equipment respectively. The detection unit for detecting these may be a sensor included in the automated equipment or an external sensor connected to the automated equipment. The arithmetic unit calculates the allowable charge amount that can charge the automated equipment using these data. The battery management unit 3 notifies the power sharing system 1 of the calculation result of the allowable charge amount.

[0021] FIG. 4 is an example of weather information. The weather information describes the history of solar radiation amount, cloud amount, weather code, temperature, etc. for each time zone.

[0022] FIG. 5 is a flowchart for explaining the operation of the prediction calculation unit 2. The power generation prediction unit calculates the power generation prediction of the photovoltaic power generation system based on the predicted solar radiation amount described in the weather information. Since the calculation formula for power generation prediction based on the solar radiation amount is generally used, it will not be described in detail here. The fluctuation prediction unit predicts the temporal variation of the power generation of the photovoltaic power generation system based on the cloud amount described in the weather information. It is known that the power generation of the photovoltaic power generation system is affected by the cloud amount, and particularly when the weather is cloudy, the temporal variation is large (fluctuates greatly every moment), and when it is sunny or rainy, the temporal variation is small (fluctuates generally corresponding to the solar radiation prediction). The fluctuation prediction unit, for example, learns in advance the relationship between the cloud amount and the fluctuation amount of the power generation by machine learning, and predicts the fluctuation amount of the power generation based on the result. Other appropriate methods may be used for prediction.

[0023] The fluctuation amount of the power generation represents, for each time, the difference between the actual power generation and the power that is assumed to be generated by the solar cell at a certain solar radiation amount. For example, the power fluctuation amount in the lower graph of FIG. 5 represents the difference between the power generation prediction and the actual power generation around 14:00.

[0024] FIG. 6 is a graph illustrating the relationship between the cloud amount and the amount of change in the generated power. As shown in the upper part of FIG. 6, on days with a large cloud amount, the generated power of the photovoltaic power generation system varies greatly for each time zone. On the other hand, as shown in the lower part of FIG. 6, on days with a small cloud amount, the generated power generally changes over time in accordance with the change in the solar radiation amount over time, and the amount of power change for each time zone is small. Based on such a relationship, the fluctuation prediction unit predicts the amount of change in the generated power of the photovoltaic power generation system. On days with a very large cloud amount (e.g., rain), the generated power is generally as predicted, so the amount of power change is small.

[0025] FIG. 7 is a graph illustrating the relationship between the voltage output from the storage battery provided in the electric device and the additional chargeable capacity. When the storage battery is in a state close to full charge, the voltage is high and the additional chargeable capacity (i.e., the available capacity) is small. However, as the discharge progresses, the voltage decreases and the additional chargeable capacity increases. The relationship between the voltage and the additional chargeable capacity varies for each storage battery (i.e., for each electric device). The voltage range data held by the battery management unit 3 describes the relationship as shown in FIG. 7 for each electric device.

[0026] The battery management unit 3 acquires the detected values of the output voltage and the output current of the storage battery provided in the electric device. The battery management unit 3 refers to the voltage range data shown in the upper part of FIG. 7 using the acquired output voltage to acquire the available capacity of the electric device. The battery management unit 3 uses the available capacity as the allowable charge amount of the electric device. If the data in the upper part of FIG. 7 cannot be prepared in advance, the available capacity may be obtained by calculation through the time integration of the output voltage and the output current.

[0027] FIG. 8 is a flowchart for explaining the procedure by which the battery management unit 3 obtains the allowable charge amount. The battery management unit 3 acquires the detected values of the output voltage and the output current of the storage battery provided in the electric device. The battery management unit 3 calculates the allowable charge amount for each electric device by referring to the voltage range data using the acquired output voltage. When there are a plurality of electric devices in the power transmission base, the allowable charge amounts of each electric device are added together, and the result is used as the allowable charge amount at the power transmission base.

[0028] FIG. 9 is an example of the result of calculating the allowable charging amount for each power transmission base point. The allowable charging amount at a power transmission base point can be expressed as the sum of the allowable charging amounts for each electrified device. The breakdown can be described for each electrified device as shown in FIG. 9.

[0029] FIG. 10 is an example of correction value data used by the power sharing system 1. The fluctuation of the generated power of the solar power generation system may be calculated by the method as described in FIGS. 5 to 6, or may be estimated by other methods. When using the method described in FIGS. 5 to 6, the power fluctuation amount is estimated based on the cloud amount in the meteorological information as shown in FIG. 10(1). The following are examples of other methods.

[0030] The power fluctuation amount may be estimated based on the solar radiation amount in the meteorological information as shown in FIG. 10(2). In this case, the relationship between the solar radiation amount and the fluctuation amount of the generated power may be learned in advance. The power fluctuation amount may be estimated based on the actual power generation performance of the solar power generation system as shown in FIG. 10(3). In this case, for example, the relationship between the rate of change of the actual power generation performance over time and the fluctuation amount of the generated power may be learned in advance. The power fluctuation amount may be estimated based on the actual power generation performance (measured value) measured at the output point of the solar power generation system as shown in FIG. 10(4). In this case, for example, the relationship between the rate of change of the measured actual power generation performance over time and the fluctuation amount of the generated power may be learned in advance.

[0031] The correction value data defines the correction value for power generation prediction for each power fluctuation amount calculated as described above. In other words, if the power fluctuation amount is determined, the correction value for power generation prediction can be determined by referring to the look-up table as shown in FIG. 10 described in the correction value data. This method for determining the correction value is an example, and an appropriate method other than the look-up table may be used. Hereinafter, the look-up table as shown in FIG. 10 will be used.

[0032] FIG. 11 shows an example of constraint condition data that the power sharing system 1 acquires from the storage unit. The constraint condition data describes the output limit of the charger for charging the electrified device. For example, it describes the upper limit of the output power when the charger charges the electrified device for each type of electrified device. The control unit 12 can calculate a charging command using this constraint condition.

[0033] FIG. 12 is a flowchart for explaining the operation procedure of the power sharing system 1. Each step in FIG. 12 will be described below.

[0034] S1201: The calculation unit 11 acquires from the prediction calculation unit 2 the power generation prediction value of the solar power generation system and the estimation result of the fluctuation amount of the generated power, respectively. The calculation unit 11 acquires the correction value data (data described in FIG. 10) stored in the storage unit.

[0035] S1202: The calculation unit 11 obtains a correction amount for the power generation prediction by referring to the correction value data using the power fluctuation amount. The calculation unit 11 calculates a corrected power generation prediction value by applying the obtained correction amount to the power generation prediction. The meaning and specific examples of the correction amount will be described using the examples described later.

[0036] S1203: The calculation unit 11 acquires the actual power generation value (measurement value) of the solar power generation system from the prediction calculation unit 2. The calculation unit 11 calculates the surplus power generation of the solar power generation system by subtracting the corrected power generation prediction value calculated in S1202 from the actual power generation value.

[0037] S1204: The calculation unit 11 acquires the allowable charge amount for each electrified device from the battery management unit 3.

[0038] S1205: The calculation unit 11 calculates the power to be transferred to the power receiving site by referring to, for example, a pre-created power transfer plan. If there is no change from the pre-planned value, this value can be used as it is. When changing the plan before submitting the plan, calculate the planned value after the change and use it as the power to be transferred in this step. If there is self-consumption at the power transmission site, subtract that amount from the power generation prediction and calculate it as the power to be transferred.

[0039] S1205: Supplementary: In principle, surplus power is used for charging electric equipment, but charging may also be performed using power obtained from the power transmission system in addition to the surplus power. Only a part of the surplus power may be used for charging, and the remaining part may be supplemented from the power transmission system for charging. If the allowable charging amount is greater than or equal to the surplus power, the shortage in the allowable charging amount may be supplemented from the power transmission system, or only a part of the allowable charging amount may be charged without supplementation. That is, it is not necessary to fully satisfy the allowable charging amount. Furthermore, the power used for charging may be supplied from the surplus power or from elsewhere. In any case, in this step, the surplus power and the allowable charging amount should be obtained in advance, and these values should be used as guidelines to calculate the power to be transferred.

[0040] S1206: Part 1: The control unit 12 obtains the output limit of the charger from the constraint condition data. The control unit 12 calculates the charging command value and the charging time (i.e., the charging amount) for the charger according to the allowable charging amount and the output limit for each electric equipment obtained in S1204. The control unit 12 transmits the calculated charging command value to the charger.

[0041] S1206: Part 2: The control unit 12 creates a power transfer plan by calculating the power to be transferred every 30 minutes according to the power to be transferred calculated in S1205. The control unit 12 transmits the created power transfer plan to the power transmission network (operating agency).

[0042] FIG. 13 is a graph illustrating the result of correcting the power generation prediction value of the solar power generation system. The calculation unit 11 corrects the power generation prediction as shown in FIG. 13 by applying a correction for downwardly correcting the power generation prediction. The surplus power generation is calculated by subtracting the power generation prediction from the actual power generation. If the surplus power generation is small (i.e., if the actual power generation and the power generation prediction are approximately equal), the power generation of the solar power generation system becomes almost the same as the power supply power as it is. Therefore, if the power generation prediction is close to the actual power generation, the power generation of the solar power generation system is used as the power supply power, and the surplus can be used as the charging power for the electrified equipment. However, as shown in FIG. 13, when the power generation fluctuates greatly, the deviation between the power generation prediction and the actual power generation may increase, and in some cases, the actual power generation may fall below the power generation prediction. Then, the power available for charging the electrified equipment becomes insufficient.

[0043] Since the electrified equipment may move between bases and the allowable charging amount at the power transmission base is not constant, it is considered desirable to ensure sufficient surplus power that can be used for charging the electrified equipment. Therefore, in the present invention, by downwardly correcting the power generation prediction, a large amount of surplus power is ensured. As a result, the actual power generation exceeds the power generation prediction, surplus power is generated, and the power that can be used for charging the electrified equipment can be ensured. The corrected predicted value in FIG. 13 represents this.

[0044] FIG. 14 is an example of the result of calculating the charging amount based on the corrected power generation prediction. By downwardly correcting the power generation prediction, the power available for charging the electrified equipment increases, while on the other hand, the power supply power decreases. FIG. 14 shows these examples in comparison with the case where the power generation prediction is not corrected and the case where it is corrected.

[0045] FIG. 15 is an example of the user interface provided by the calculation unit 11. The user interface can present the results calculated by the calculation unit 11 and the control unit 12. For example, the calculation results such as the power supply power and the charging amount can be presented for each base.

[0046] <Embodiment 2> FIG. 16 is a graph illustrating the result of correcting the power generation prediction value of the power generation system 1 according to Embodiment 2 of the present invention. The allowable charge amount of the electrified device is in principle the same as the allowable charge amount presented by a measuring instrument or the like provided in the electrified device itself. However, the allowable charge amount calculated by the battery management unit 3 based on the measured value may deviate from the presented value. For example, it may be due to a decrease in the charge capacity due to the deterioration of the storage battery or a measurement error. In this case, the calculation unit 11 may further correct the power generation prediction that has been corrected once. Other configurations are the same as those in Embodiment 1.

[0047] For example, when the allowable charge amount calculated by the battery management unit 3 is larger than the presented value, the power generation prediction is re-corrected so as to increase the charge amount for the electrified device. Since the charge amount for the electrified device is allocated from the surplus power, in order to increase the charge amount, it is only necessary to increase the surplus power. That is, the power generation prediction may be corrected downward again. When the calculated allowable charge amount is smaller than the presented value, it means that the portion of the surplus power that can be charged to the electrified device is small. Therefore, it is desirable to use the surplus power as the power for lending. Therefore, in this case, the power generation prediction may be corrected upward.

[0048] FIG. 17 is an example of the result of calculating the charge amount based on the power generation prediction after re-correction. Here, an example is shown in which the charge amount for the electrified device is increased by correcting the power generation prediction downward during re-correction.

[0049] FIG. 18 is a flowchart for explaining the operation procedure of the power lending system 1 in Embodiment 2. Among the flowcharts described in Embodiment 1, new steps S1801 to S1803 are added between S1204 and S1205. Others are the same as those in Embodiment 1.

[0050] S1801: The calculation unit 11 compares the calculated value of the allowable charge amount obtained in S1204 with the presented value of the allowable charge amount presented by the electrified device. If the presented value is larger, skip to S1205. Otherwise, proceed to S1802. If the difference between the two is small, it may also be possible to skip to S1205. That is, if the difference obtained by subtracting the presented value from the calculated value is greater than or equal to the threshold value, proceed to S1802; otherwise (if the two are close), it may be possible to skip to S1205.

[0051] S1802 - S1803: The calculation unit 11 re - corrects the power generation prediction so as to bring the charge amount for the electrified device closer to the calculated value obtained in S1204 (S1802). The calculation unit 11 recalculates the surplus power by subtracting the re - corrected power generation prediction from the power generation actual result (S1803).

[0052] <Embodiment 3> FIG. 19 is a graph illustrating the result of correcting the power generation prediction value of the solar power generation system by the power sharing system 1 according to Embodiment 3 of the present invention. The allowable charge amount of the electrified device may change over time. Along with this, the allowable charge amount calculated by the battery management unit 3 based on the measured value also changes over time. In this case, the calculation unit 11 may further correct the power generation prediction that has already been corrected once. Other configurations are the same as those in Embodiment 1.

[0053] For example, when the allowable charge amount after a certain time increases compared to the value calculated initially, the power generation prediction is re - corrected so as to increase the charge amount for the electrified device. Specifically, similar to Embodiment 2, the power generation prediction after that time may be downward re - corrected. FIG. 19 shows an example of downward re - correcting the power generation prediction after 12:00. The re - correction procedure is the same as that in Embodiment 2 except for correcting the power generation prediction after that time.

[0054] <Embodiment 4> FIG. 20 is an example of constraint condition data that the power sharing system 1 according to Embodiment 4 of the present invention acquires from the storage unit. Among the power generated by the photovoltaic power generation system, the minimum ratio to be used for charging the electric devices may be defined as a utilization ratio constraint. The data in the lower part of FIG. 20 is an example thereof. For example, if the utilization ratio constraint is 50%, at least 50% of the generated power must be used for charging any of the electric devices. In this case, the power sharing system 1 (control unit 12) will generate a charging command so as to charge at least the minimum power to the electric devices.

[0055] FIG. 21 is a configuration diagram of the power sharing system 1 according to Embodiment 4. When the control unit 12 outputs a charging command to the charger, it may indicate a charging rate (that is, the magnitude of the charging current). In view of the fluctuation of the generated power, for example, when there is a time margin until the scheduled time to operate the electric device, slow charging may be indicated, and when the power fluctuation is large, rapid charging may be used to complete the charging quickly. Other configurations are the same as those in the above embodiments.

[0056] <Regarding the modification of the present invention> The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Also, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Also, for a part of the configuration of each embodiment, addition, deletion, or replacement with other configurations is possible.

[0057] In the above embodiments, it is desirable that the frequency at which the control unit 12 calculates (updates) the charging command value is higher than the frequency at which the sharing plan is calculated. This is because the sharing plan is typically a plan every 30 minutes, while the charging command is considered to occur at a shorter time interval.

[0058] In the above embodiments, each functional unit (for example, the arithmetic unit 11 and the control unit 12) included in the power sharing system 1, the prediction calculation unit 2, and the battery management unit 3 can be configured by hardware such as a circuit device that implements these functions, or can be configured by a software that implements these functions being executed by an arithmetic device such as a CPU (Central Processing Unit).

[0059] In the above embodiments, the prediction calculation unit 2 may be configured as a part of the power sharing system 1, or may be configured as a functional unit separate from the power sharing system 1.

[0060] In the above embodiments, when downwardly correcting the power generation prediction, it is desirable to correct the power generation prediction so that the corrected power generation prediction is lower than the power generation actual result. However, it should be noted that this is not necessarily the case when the charging amount for the electrified equipment is supplemented by means other than the power generation from the solar power generation system.

Explanation of Reference Numerals

[0061] 1: Power sharing system 11: Arithmetic unit 12: Control unit 2: Prediction calculation unit 3: Battery management unit

Claims

1. A power trading system that transmits the power generated by a solar power generation system provided at a power transmission site to a power receiving site via a power transmission network, an arithmetic unit that calculates a charging amount for charging an electrified device at the power transmission site and a trading power transmitted from the power transmission site to the power receiving site, a control unit that creates a charging command for the electrified device and a power trading plan from the power transmission site to the power receiving site, comprising: the arithmetic unit corrects the predicted value based on a predicted value of the power generated by the solar power generation system and a variation amount of the power generated by the solar power generation system, the arithmetic unit calculates the surplus power generation of the solar power generation system by subtracting the corrected predicted value from the actual value of the power generated by the solar power generation system, the arithmetic unit calculates the charging amount and the trading power based on the surplus power generation and the allowable charging amount of the electrified device, the control unit creates the charging command and the power trading plan based on the charging amount calculated by the arithmetic unit and the trading power calculated by the arithmetic unit A power trading system characterized by the above.

2. the arithmetic unit calculates the predicted value from the solar radiation amount described in the weather prediction data, the arithmetic unit calculates the variation amount from the cloud amount described in the weather prediction data, the arithmetic unit corrects the predicted value based on the predicted value calculated from the solar radiation amount and the variation amount calculated from the cloud amount The power trading system according to claim 1, characterized by the above.

3. the arithmetic unit calculates the predicted value from the solar radiation amount described in the weather prediction data, the arithmetic unit calculates the variation amount by using at least one of the power generation actual value of the solar power generation system or the measured value obtained by measuring the power generation actual value at the output point of the solar power generation system, the arithmetic unit corrects the predicted value based on the predicted value calculated from the solar radiation amount and the variation amount calculated from the power generation actual value or the measured value The power trading system according to claim 1, characterized by the above.

4. the arithmetic unit acquires voltage range data describing the correspondence relationship between the output voltage of the battery provided in the electrified device and the allowable charging amount, the arithmetic unit specifies the allowable charging amount by referring to the voltage range data using the measured value of the output voltage The power trading system according to claim 1, characterized by the above.

5. The calculation unit calculates the charging amount at the power transmission base point by adding up the allowable charging amounts of each of the one or more electrified devices charged at the power transmission base point. The power sharing system according to claim 1, characterized in that.

6. Based on the predicted value of the power generated by the solar power generation system and the amount of variation in the power generated by the solar power generation system, the calculation unit downward corrects the predicted value so that the actual power generated by the solar power generation system exceeds the predicted value. The power sharing system according to claim 1, characterized in that.

7. The control unit acquires constraint condition data describing the upper limit power output by a charger that charges the electrified device. The control unit sets the upper limit value of the charging command according to the upper limit power described in the constraint condition data. The power sharing system according to claim 1, characterized in that.

8. The calculation unit respectively acquires the presented value of the allowable charging amount presented by a measuring instrument provided in the electrified device and the calculated value of the allowable charging amount. When the difference obtained by subtracting the presented value from the calculated value is equal to or greater than a threshold value, the calculation unit further downward corrects the downward corrected predicted value. The power sharing system according to claim 6, characterized in that.

9. The calculation unit acquires the time change of the allowable charging amount. The calculation unit re-corrects the predicted value so that the allowable charging amount changed by the time change can be satisfied by the surplus generated power. The power sharing system according to claim 1, characterized in that.

10. The control unit acquires constraint condition data describing the minimum value of the ratio to be allocated as the power for charging the electrified device among the power generated by the solar power generation system. The control unit generates the charging command so that a ratio equal to or higher than the minimum value among the power generated by the solar power generation system is allocated as the power for charging the electrified device. The power sharing system according to claim 1, characterized in that.

11. The control unit indicates the charging rate for the electrified device in the charging command. The power sharing system according to claim 1, characterized in that.

12. The control unit updates the charging command at a frequency higher than the frequency of updating the power sharing plan. The power sharing system according to claim 1, characterized in that.

13. The power sharing system according to claim 1. A prediction calculation unit that calculates the predicted value and the amount of variation, A battery management unit that calculates the allowable charge amount, A power system characterized by comprising the same.

14. The power system is composed of the power transmission site and the power reception site, The solar power generation system is arranged at the power transmission site The power system according to claim 13, characterized in that.

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