JP6290717B2 - Power management equipment - Google Patents

Description

  The present invention relates to a power management apparatus.

  With the start of liberalization of power retail, it is possible to procure power from specific power companies as well as conventional power companies, and various power procurement methods have been proposed that are cheaper than before. (For example, refer to Patent Document 1). In Patent Document 1, while predicting the amount of power that can be generated based on information such as weather and temperature and the characteristic information of the generator, the amount of power demand is predicted, and the amount of power that is procured from the outside based on both predicted values A technique for procuring electric power at a low cost by calculating the above is disclosed.

JP 2006-050834 A

  With the recent increase in environmental protection awareness, the policy is to promote power generation using renewable energy. For example, power based on renewable energy (also referred to as “green power”) has been popularized by providing a fixed purchase system for power generation using renewable energy.

  By using electric power based on such renewable energy, it is possible to procure electric power at low cost. For example, by using power supplied by solar power generation, it is possible to procure power cheaply compared to the case of using power supplied from a conventional power company or power supplied from a specific scale power company. Can be planned.

  However, it is known that the amount of power that can be supplied by photovoltaic power generation varies greatly depending on the weather. For example, when the power supplied by solar power generation is reduced from the planned power, insufficient power is procured from a conventional power company or the like. In this way, in the case of procuring insufficient power from an electric power company or the like, a penalty (extra charge) is paid to procure the shortage of power, and there is a risk that procurement costs may increase against cheap power procurement.

  As described in Patent Document 1, various methods for preventing the occurrence of the above-described penalty by predicting the amount of power that can be generated based on weather information and generator information are also proposed. ing. However, there is still a possibility of paying a penalty, and there is a problem that utilization of power supplied by solar power generation is difficult.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a power management apparatus that facilitates the use of power based on renewable energy in which the amount of power that can be supplied varies. .

In order to achieve the above object, the present invention provides the following means.
A power management apparatus according to the present invention is a power generation apparatus that supplies power based on renewable energy, and is a power management apparatus that determines a power value to be procured from a power generation facility in which a value of power generated by weather conditions varies. , An acquisition unit that acquires weather information regarding the weather conditions, facility information regarding a relationship between predetermined weather information and the value of power generated by the power generation facility, and power generated by the power generation facility according to the predetermined weather information And a first procurement power value that can be procured from the power generation facility with a reliability higher than a predetermined reliability based on the storage unit that stores the power generation information related to the probability of the value, and the weather information, the facility information, and the power generation information. And a calculation unit for obtaining a second procured power value that can be procured from the power generation facility with a reliability equal to or lower than the predetermined reliability.

  According to the power management apparatus of the present invention, the first procured power value that can be procured with higher reliability than the predetermined reliability from the power generation facility in which the value of the electric power generated according to the weather conditions varies, and the reliability that is lower than the predetermined reliability And a second procurement electric power value that can be procured at a certain degree. In this way, by dividing the power procured from the above-mentioned power generation facility into the first procured power value and the second procured power value, and making a supply and demand plan using the first procured power value with high procurement reliability This makes it easier to control the decrease in power procured from power generation facilities. On the other hand, the second procured power value, which has a relatively low reliability and is difficult to use for planned use, can be used for selling power to the power market or the like.

  In the above invention, in the probability distribution of the value of the electric power generated by the power generation equipment and the value of the electric power distributed including the prediction value, obtained based on the weather information, the equipment information and the power generation information. The first procurement power value relates to a first power value that is a value equal to or less than a power value at a probability corresponding to the predetermined reliability, and the second procurement power value is greater than the predetermined reliability. It is preferable to relate to a value obtained by subtracting the first power value from the second power value that is a power value at a probability corresponding to another reliability having a low reliability.

  Thus, when obtaining the first procurement power value and the second procurement power value, by using the predicted value and probability distribution generated by the power generation facility, compared with the case where the predicted value and probability distribution are not used, It becomes easy to obtain the first procured power value and the second procured power value.

In the above invention, it is preferable that the calculation unit obtains the first procured power value and the second procured power value for each of a plurality of periods obtained by dividing time.
Thus, by obtaining the first procurement power value and the second procurement power value for each of a plurality of periods, even if the power value generated by the power generation facility changes due to changes in weather conditions, the above period The first procured power value and the second procured power value reflecting the change can be obtained.

  In the above invention, it is preferable that the calculation unit obtains the first procurement power value and the second procurement power value in each of the plurality of periods after obtaining the weather information by the obtaining unit.

  Thus, after acquiring weather information, by obtaining the first procurement power value and the second procurement power value in a plurality of periods, the first procurement power value and The amount of calculation processing for obtaining the second procurement power is reduced.

  In the above invention, the power generation information is information related to a probability that varies depending on a length of elapsed time from the time when the first procured power value and the second procured power value are obtained. It is preferable that the first procurement power value and the second procurement power value are obtained using the power generation information corresponding to the elapsed time from the time of obtaining the procurement power value and the second procurement power value.

  Thus, by using the power generation information corresponding to the elapsed time from the time when the first procurement power value and the second procurement power value are obtained, it is possible to suppress a decrease in the reliability of the first procurement power value. That is, as the elapsed time from the time when the first procurement power value and the second procurement power value are obtained becomes longer, the range in which the value of the power generated by the power generation facility fluctuates and the probability distribution changes. By determining the first procured power value and the second procured power value in consideration of this change, the reliability of the first procured power value can be easily maintained.

In the above invention, the lengths of the plurality of periods are preferably shortened as the first procured power value and the second procured power value are obtained.
By changing the lengths of the plurality of periods in this way, a period in which the range in which the value of the power generated by the power generation facility fluctuates is finely set, and the reliability of the first procurement power value is further increased. It becomes easy.

In the above invention, the lengths of the plurality of periods are preferably equal.
By making the lengths of the plurality of periods equal in this way, the amount of calculation processing for obtaining the first procurement power value and the second procurement power is reduced as compared with the case where periods having different lengths are used.

  According to the power management apparatus of the present invention, the first procured power value that can be procured with higher reliability than the predetermined reliability from the power generation facility in which the value of the electric power generated according to the weather conditions varies, and the reliability that is lower than the predetermined reliability. By obtaining the second procurement power value that can be procured at a certain degree, it is possible to facilitate the use of power based on renewable energy in which the amount of power that can be supplied varies.

It is a model diagram explaining the structure of the power management apparatus which is one Embodiment of this invention. It is a schematic diagram explaining the model which estimates the electric power generation amount in the calculating part of FIG. It is a graph explaining the relationship between the electric power generation amount estimated by the calculating part, 1st procurement electric energy, and 2nd procurement electric energy. It is a graph explaining the other relationship between the estimated electric power generation amount, 1st procurement electric energy, and 2nd procurement electric energy.

A power management apparatus according to an embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, the power generation facility that supplies power based on renewable energy is the solar power generation facility 30, and the power management apparatus 1 obtains the amount of power that the load facility 40 procures from the solar power generation facility 30, Description will be made by applying to an example in which the amount of power to be procured is managed. Note that the power generation facility that supplies power based on renewable energy may be the solar power generation facility 30 or the wind power generation facility as described above, and the generated power varies depending on weather conditions. As long as it is a power generation facility, the type of the power generation facility is not particularly limited.

  As shown in FIG. 1, the power management apparatus 1 manages the amount of power procured by the load facility 40 from the solar power generation facility 30 and sells power from the solar power generation facility 30 to the power market 50. It is also the amount management.

  The power selling destination may be the electric power market 50 as described above, or may be another load facility, and does not limit the power selling destination. Furthermore, instead of selling power, power may be stored by charging means such as a secondary battery, and the use of power is not limited.

  The power management apparatus 1 is a computer system having a CPU (Central Processing Unit), ROM, RAM, hard disk, input / output interface, and the like. The control program stored in the ROM or the like causes the CPU to function as the calculation unit 11, causes the input / output interface or the like to function as the acquisition unit 12 and the output unit 13, and functions as the storage unit 14 as a hard disk or the like. It is something to be made.

  The acquisition unit 12 is connected to the weather server 20 via the information communication network 2 such as the Internet, and acquires weather information regarding weather conditions from the weather server 20. Examples of weather information acquired by the acquiring unit 12 include weather forecast character data, GPV data (Grid Point Value data), satellite images, sky images, and the like for an area where the photovoltaic power generation facility 30 includes the installation position. can do.

  The storage unit 14 includes a database of facility information representing the amount of power generated by the solar power generation facility 30 in predetermined weather information, and power generation information representing the probability of the power value generated by the solar power generation facility 30 under predetermined weather conditions. The database is stored.

  The facility information is, for example, information indicating a correspondence relationship between the power generation amount generated by the solar power generation facility 30 when the predetermined solar radiation amount is obtained and the solar radiation amount, and is information unique to each solar power generation facility 30. is there. For example, even if the same amount of solar radiation is obtained, the power generation information represents variation in the amount of power generated in the solar power generation facility 30, and is information indicating the probability that each of the varied power generation amounts will appear. is there. The power generation information may be preliminarily estimated, or may be sequentially updated based on the power generation results accumulated by operating the solar power generation facility 30.

  The computing unit 11 obtains a first procurement power amount (first procurement power value) P1 and a second procurement power amount (second procurement power value) P2, and the obtained first procurement power amount P1 and Based on the second procurement power amount P2, the supply destination and supply amount of the power generated by the solar power generation facility 30 are managed. In addition, the specific description which calculates | requires the 1st procurement electric energy P1 and the 2nd procurement electric energy P2 in the calculating part 11 is mentioned later.

  The output unit 13 outputs a control signal for controlling the supply destination and the supply amount of the generated power to the solar power generation facility 30. The output unit 13 may be connected to the photovoltaic power generation facility 30 via an information communication network such as the Internet, or may be connected via a dedicated line. In particular, the output unit 13 has a transmission means for transmitting a control signal. It is not limited.

Next, a power amount management method in the power management apparatus 1 having the above-described configuration will be described with reference to FIGS.
First, the power management apparatus 1 acquires a numerical weather model, a satellite image, and a sky image from the weather server 20 using the acquisition unit 12. The numerical weather model includes weather forecast character data and GPV data. Furthermore, the acquisition part 12 acquires solar radiation data from the solar radiation sensor 31 which measures the solar radiation amount installed in the solar power generation facility 30.

  The calculation part 11 performs the calculation which estimates the electric power generation amount generated by the solar power generation equipment 30 by indirect prediction or direct prediction as shown in FIG. First, calculation by indirect prediction will be described. The calculation unit 11 performs calculation for predicting future solar radiation based on the acquired numerical weather model, satellite image, sky image, solar radiation data, and estimated conversion model CM1.

  Thereafter, the calculation unit 11 acquires the facility information and the power generation information from the storage unit 14, and the solar power generation facility 30 based on the acquired facility information and power generation information, the obtained solar radiation prediction, and the estimated conversion model CM2. Predicts the amount of power generated.

  In the case of calculation by direct prediction, the calculation unit 11 directly predicts the amount of power generated by the solar power generation facility 30 without calculating future solar radiation prediction. Specifically, the photovoltaic power generation facility 30 generates power based on the acquired numerical weather model, satellite image, sky image and solar radiation data, estimated conversion model CM1, facility information and power generation information, and estimated conversion model CM2. Predict the amount of power generated.

  Next, the power generation amount predicted by the calculation unit 11 will be described with reference to FIG. In FIG. 3, the horizontal axis indicates the passage of time, and the vertical axis indicates the power value generated by the solar power generation facility 30 or the power value procured from the solar power generation facility 30. Therefore, the electric energy is shown as an area in FIG.

  The predicted value of the power value generated by the photovoltaic power generation facility 30 estimated by the calculation unit 11 based on the numerical weather model, satellite image, sky image and solar radiation data, facility information, etc. is, for example, the curve FC in FIG. As shown in The theoretical maximum value of the power value that can be generated by the solar power generation facility 30 is, for example, as shown by the curve MX in FIG.

  The range of the variation in the power value generated by the photovoltaic power generation facility 30 calculated by the arithmetic unit 11 based on the numerical weather model, satellite image, sky image and solar radiation data, power generation information, etc. is, for example, the region of FIG. As shown by VB. The upper limit of the region VB is the above-described curve MX, and the lower limit is the curve MN. The curve MN indicates, for example, the lowest power value in the range of power value variation.

  In other words, the region VB also indicates a probability distribution in which a power value generated by the solar power generation facility 30 appears. The probability distribution has the highest appearance probability of the power value related to the vicinity of the curve FC that is the predicted value, and the appearance probability of the power value related to the position decreases as the distance from the curve FC moves upward or downward in FIG. Distribution. In the present embodiment, description will be made by applying to an example in which the curve MN indicates a probability corresponding to a predetermined reliability described later.

  On the other hand, the region RB sandwiched between the horizontal axis and the curve MN in FIG. 3 is a region indicating that there is a low possibility of being affected by variations in the power value generated by the solar power generation facility 30, and the region RB This is an area indicating that the reliability with which the power value included in can be supplied is higher than the predetermined reliability. The region VB is a region indicating that the reliability with which the power value can be supplied is equal to or less than a predetermined reliability. The predetermined reliability may be a predetermined value, or may be a value that is newly set based on the operation results of the photovoltaic power generation facility 30, and the numerical value is particularly limited. is not.

  The calculating part 11 performs the calculation process which calculates | requires the 1st procurement electric energy P1 and the 2nd procurement electric energy P2 using the content of the above-mentioned FIG. Here, it is applied to an example in which the period during which power generation is performed in the solar power generation facility 30 is divided into a plurality of periods of equal length, and the first procurement power amount P1 and the second procurement power amount P2 are obtained in each period. To explain. The length of the plurality of periods may be a length divided by a minute unit such as 30 minutes, or may be a length divided by a time unit such as one hour.

  In each of the plurality of periods divided as described above, the calculation unit 11 performs calculation processing for setting the first procurement power amount P1 to be included in the region RB. Further, a calculation process for setting the upper end of the second procurement power amount P2 added to the first procurement power amount P1 so as to be within the region VB, more preferably between the curve FC and the curve MN. I do.

  For example, the calculation unit 11 obtains a first power value PV1 that is a value equal to or less than a power value corresponding to the curve MN (in other words, a probability corresponding to a predetermined reliability) in a predetermined period, and this first power value PV1. And the 1st procurement electric energy P1 is calculated | required based on the length of a predetermined period. Further, a second power value PV2 that is a power value corresponding to a probability corresponding to another reliability whose reliability is lower than a predetermined reliability is obtained. Then, based on the value obtained by subtracting the first power value PV1 from the second power value PV2 and the length of the predetermined period, the second procurement power amount P2 is obtained.

  As described above, the first procurement power amount P1 and the second procurement power amount P2 may be set separately, or the total power amount of the first procurement power amount P1 and the second procurement power amount P2 is set. The values of the first procurement power amount P1 and the second procurement power amount P2 may be set later, and the setting method is not particularly limited.

  When the setting is performed as described above, the calculation unit 11 sends the first procurement power amount P1 to the load facility 40 via the output unit 13 and the second procurement. A process of outputting a control signal for selling the power amount P2 to the power market 50 is performed.

  According to the power management apparatus 1 configured as described above, the first procurement power amount P1 that can be procured with higher reliability than the predetermined reliability from the photovoltaic power generation facility 30 in which the value of the electric power generated by the weather condition varies, The second procurement electric power amount P2 that can be procured with a reliability equal to or less than the reliability of the second is required. Thus, the electric power procured from the above-described solar power generation facility 30 is divided into the first procured electric energy P1 and the second procured electric energy P2, and the first procured electric energy P1 with high procurement reliability is used. By making a supply and demand plan, it becomes easy to suppress a decrease in the electric power procured from the solar power generation facility 30. On the other hand, the second procured power amount P2, which has a relatively low reliability and is difficult to use for systematic use, can be used for selling power to the power market 50 or the like. Therefore, it is possible to easily use the power supplied from the solar power generation facility 30 in which the amount of power that can be supplied varies.

  When obtaining the first procured power amount P1 and the second procured power amount P2, by using the predicted value and probability distribution generated by the photovoltaic power generation facility 30, compared with the case where the predicted value and probability distribution are not used. The first procurement power amount P1 and the second procurement power amount P2 can be easily obtained.

  Even if the power value generated by the photovoltaic power generation facility 30 changes due to a change in weather conditions, the first procurement power amount P1 and the second procurement power amount P2 are obtained for each of a plurality of periods. It is possible to obtain the first procured power amount P1 and the second procured power amount P2 reflecting changes for each period.

  After obtaining the weather information, by obtaining the first procurement power amount P1 and the second procurement power amount P2 in a plurality of periods, the first procurement power amount P1 and the case where the weather information is obtained for each period are obtained. The calculation processing amount for obtaining the second procurement power amount P2 can be reduced.

  By making the lengths of the plurality of periods equal, it is possible to reduce the amount of calculation processing for obtaining the first procured power amount P1 and the second procured power amount P2 as compared to the case of using different length periods. .

  In the above-described embodiment, the power generation information is applied to an example that is information on a probability that is unrelated to the elapsed time from the time when the first procurement power amount P1 and the second procurement power amount P2 are obtained. The information regarding the probability which changes according to the length of the elapsed time from the time of calculating | requiring the 1st procurement electric energy P1 and the 2nd procurement electric energy P2 may be sufficient.

  As described above, by using the power generation information corresponding to the elapsed time from the time when the first procured power amount P1 and the second procured power amount P2 are obtained, a decrease in the reliability of the first procured power amount P1 can be suppressed. That is, as the elapsed time from when the first procured power amount P1 and the second procured power amount P2 are obtained becomes longer, the range in which the value of the power generated by the solar power generation facility 30 fluctuates and the probability distribution is increased. Change. Considering this change, obtaining the first procurement power amount P1 and the second procurement power amount P2 makes it easy to maintain the reliability of the first procurement power amount P1.

  Further, as in the above-described embodiment, the plurality of divided periods may have equal time lengths, or may be divided to have different time lengths as shown in FIG. May be. Specifically, as the first procured power value and the second procured power value are obtained, the length of the period may be shortened.

  By changing the lengths of the plurality of periods in this way, a period in which the range in which the value of the power generated by the photovoltaic power generation facility 30 varies is narrowly set, and the reliability of the first procurement power amount P1 is set. It becomes easier to increase the degree.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the power management device 1 and the photovoltaic power generation facility 30 are separately installed and explained by applying to an example in which the power management device 1 and the photovoltaic power generation facility 30 are connected via the information communication network 2 or the like. The power management apparatus 1 and the solar power generation facility 30 are not limited to those installed separately, and can be applied to those in which both are installed integrally.

  DESCRIPTION OF SYMBOLS 1 ... Power management apparatus, 11 ... Calculation part, 12 ... Acquisition part, 14 ... Memory | storage part, 30 ... Solar power generation equipment (power generation equipment), P1 ... 1st procurement electric energy (1st procurement electric power value), P2 ... 1st 2 Procured power (second procured power value)

Claims (6)

A power generation device that supplies electric power based on renewable energy, and is a power management device that determines a power value to be procured from a power generation facility in which a value of power generated by weather conditions varies,
An acquisition unit for acquiring weather information relating to the weather conditions;
A storage unit that stores facility information related to a relationship between predetermined weather information and a value of power generated by the power generation facility, and power generation information related to a probability of a value of power generated by the power generation facility in the predetermined weather information; ,
Based on the weather information, the facility information, and the power generation information, a first procurement power value that can be procured from the power generation facility with a reliability higher than a predetermined reliability, and the power generation facility with a reliability equal to or less than the predetermined reliability A calculation unit for obtaining a second procurement power value that can be procured from
Is provided,
In the probability distribution of the predicted value of the power value generated by the power generation facility and the power value distributed including the predicted value, obtained based on the weather information, the facility information and the power generation information,
The first procurement power value relates to a first power value that is a value equal to or less than a power value at a probability corresponding to the predetermined reliability.
The second procurement power value relates to a value obtained by subtracting the first power value from a second power value that is a power value at a probability corresponding to another reliability whose reliability is lower than the predetermined reliability. A power management apparatus characterized by that. The arithmetic unit, for each of a plurality of periods obtained by dividing the time, the power management system of claim 1, wherein the determining the first raised power value and the second raising power value. 3. The power according to claim 2 , wherein the calculation unit obtains the first procurement power value and the second procurement power value in each of the plurality of periods after obtaining the weather information by the obtaining unit. Management device. The power generation information is information regarding probabilities that differ depending on the length of time elapsed since the time when the first procurement power value and the second procurement power value were obtained,
The calculation unit obtains the first procurement power value and the second procurement power value by using the power generation information corresponding to the elapsed time from the time of obtaining the first procurement power value and the second procurement power value. The power management apparatus according to claim 3 . Wherein the plurality of lengths of time, the power management device according to claim 3 or 4, characterized in that shortened due to the approach the time of obtaining the first raised power value and the second raising power value. The power management apparatus according to any one of claims 2 to 4 , wherein the lengths of the plurality of periods are equal.

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