JP6100187B2 - Generation power rapid decrease sign detection device, photovoltaic power generation system, generated power rapid decrease sign detection method, and program - Google Patents

Description

  The present invention relates to a power generation rapid decrease sign detection device that detects a sign of a sudden decrease in power generated by a photovoltaic power generation panel.

  In recent years, photovoltaic power generation systems have been developed for the purpose of protecting the global environment and effectively using energy resources. A photovoltaic power generation system is a system that converts light energy of sunlight into electrical energy using a photovoltaic power generation panel.

  By the way, the generated power of the photovoltaic power generation panel is easily influenced by the weather because it depends on the amount of solar radiation. When the generated power of the photovoltaic power generation panel fluctuates, the power system electrically connected to the photovoltaic power generation panel may be affected. For example, when the power generated by the solar power generation panel changes suddenly, the frequency of the power supplied via the power system may also fluctuate, leading to unstable power supply.

  It is also conceivable to predict fluctuations in the power generated by the photovoltaic power generation panel based on weather information related to one area. However, for example, even if the weather information is observed as “clear”, the generated power of the photovoltaic power generation panel may suddenly decrease because the sun is temporarily hidden in the clouds, and such fluctuations can be accurately predicted. It is difficult.

  For example, Patent Document 1 includes a solar panel, an omnidirectional camera that captures the entire sky, an image processing unit that detects cloud distribution and movement based on the image of the entire sky, and the cloud distribution and movement described above. And a power prediction processing unit that predicts the generated power of the solar panel based on the solar power generation system.

JP 2007-184354 A

  In the technique described in Patent Document 1, when the cloud distribution and motion are predicted by the image processing unit, extremely complicated processing such as region division based on lightness in the image and calculation of a cloud movement vector is performed. Therefore, there is a problem that a great amount of labor is spent when creating a program for the image processing unit, and the processing load on the image processing unit increases. In addition, since the brightness in the image differs depending on the weather, season, topography, etc., there is a possibility that the cloud distribution and movement cannot be accurately predicted.

  Of the sudden changes in the power generated by the photovoltaic power generation panel, there is a strong demand for appropriately detecting signs of a sudden decrease in generated power. This is because, even if an attempt is made to compensate for the decrease in generated power by discharging from the storage battery, the timing at which this discharge is started does not catch up with the sudden decrease in generated power, and as described above, the power supply may become unstable.

  Therefore, an object of the present invention is to provide a power generation rapid decrease sign detection device and the like that appropriately detect a sign of a sudden decrease in power generated by a photovoltaic power generation panel.

In order to solve the above-described problem, the present invention provides a photovoltaic power generation panel when a state in which the change rate of the number of high luminance pixels is equal to or greater than a predetermined change rate threshold indicating an increase in the number of high luminance pixels continues for a predetermined time It is determined that there is a sign of a sudden decrease in generated power.
Details will be described in an embodiment for carrying out the invention.

  ADVANTAGE OF THE INVENTION According to this invention, the generated electric power rapid decrease sign detection apparatus etc. which detect the sudden decrease sign of the generated power of a solar power generation panel appropriately can be provided.

It is a block diagram of the solar energy power generation system which concerns on one Embodiment of this invention. (A) is explanatory drawing which shows the example of the sky image produced | generated by an image generation apparatus, (b) is a graph which shows typically the change of the electric power generation of a photovoltaic power generation panel, (c) is high-intensity It is a graph which shows typically change of the number of pixels. It is a flowchart which shows the process which the arithmetic processing part of the generated electric power rapid decrease sign detection apparatus performs. (A) is a graph which shows the change of the number of high-intensity pixels, (b) is a graph which shows the change of the difference moving average of the number of high-intensity pixels, (c) is a graph which shows the change of generated electric power. It is a flowchart which shows the process which an electric power control apparatus performs.

<Embodiment>
<Configuration of solar power generation system>
FIG. 1 is a configuration diagram of a photovoltaic power generation system according to the present embodiment. The photovoltaic power generation system S is a system that converts light energy of sunlight into electrical energy by the photovoltaic power generation panel 1 and supplies the electrical energy to the power system K via the power control device 2.
As shown in FIG. 1, the photovoltaic power generation system S includes a photovoltaic power generation panel 1, a power control device 2, a storage battery 3, an image generation device 4, and a generated power rapid decrease sign detection device 5. .

  The photovoltaic power generation panel 1 converts the light energy of sunlight into electrical energy, and has a plurality of solar cells. The photovoltaic power generation panel 1 may be fixed regardless of the position of the solar power generation panel 1 with respect to the sun, or may be adjusted to track the sun.

The power control device 2 (power conditioner) performs power conversion or the like according to the generated power of the photovoltaic power generation panel 1 and is electrically connected to the photovoltaic power generation panel 1, the storage battery 3, and the power system K. ing.
The power control device 2 has a function of converting the generated power (DC power) of the photovoltaic power generation panel 1 into AC power and supplying the AC power to the power system K. The power control device 2 also has a function of charging the storage battery 3 with power from the photovoltaic power generation panel 1 or the power system K and supplying discharged power from the storage battery 3 to the power system K. The power control device 2 is connected to the image generation device 4 and the generated power rapid decrease sign detection device 5 via the network E.

The storage battery 3 has a plurality of battery cells (not shown) connected in series or series-parallel, and is connected to the power control device 2. As the storage battery 3, for example, a lithium ion storage battery can be used.
The image generation device 4 generates an aerial image by capturing an area including at least the sun with the camera 41, and includes a camera 41 and a communication processing unit 42.

The camera 41 (imaging means) has, for example, a wide-angle lens (not shown) having a relatively large angle of view so that the sun can be continuously imaged from sunrise to sunset. The camera 41 may be an omnidirectional camera, or a camera that automatically adjusts the direction so as to track the sun.
The camera 41 is installed in the vicinity of the photovoltaic power generation panel 1 and images a region including the sun at a predetermined cycle (for example, every 5 seconds). And the camera 41 outputs the information of the sky image obtained by imaging to the communication processing part 42 in time series.
The communication processing unit 42 generates the sky image information in which the information of the sky image input from the camera 41 and the time information indicating the imaging time are associated with each other, and transmits the generated power rapid decrease sign detection device 5 via the network E. Send.

The generated power rapid decrease sign detecting device 5 detects whether or not the generated power of the photovoltaic power generation panel 1 is suddenly reduced in the near future (for example, several seconds later) based on the aerial image information input from the image generating device 4. It is. The generated power rapid decrease sign detection device 5 is, for example, a microcomputer (not shown), reads a program stored in a ROM (Read Only Memory), develops it in a RAM (Random Access Memory), and a CPU (Central Processing Unit). ) Executes various processes.
Hereinafter, prior to the description of each configuration of the generated power rapid decrease sign detection device 5, the function of the generated power rapid decrease sign detection device 5 will be briefly described with reference to FIG.

FIG. 2A is an explanatory diagram illustrating an example of a sky image generated by the image generation apparatus, and is arranged in time series from the left side of the page.
The vertical axis in FIG. 2B is the generated power of the photovoltaic power generation panel, and the vertical axis in FIG. 2C is the number of high-luminance pixels in the sky image. Note that the “number of high-luminance pixels” is the number of pixels in the sky image that have a luminance value equal to or greater than a predetermined luminance threshold, and represents the area of a white bright portion in the sky image.

  The sky h Q1 (see FIG. 2A) captured at time t1 shows the sun h and a portion i (halation) that shines white surrounding the sun h. The number of pixels in the areas indicated by the symbols h and i corresponds to the number of high luminance pixels described above (see FIG. 2C). In this case, since the sunlight is favorably irradiated toward the photovoltaic power generation panel 1, the generated power at the time t1 has a relatively high value (see FIG. 2B).

  In the sky image Q2 captured at time t2, a sun h and a cloud j that appears near the sun h are shown. In this state, the sun h and the cloud j are relatively distant from each other, and the solar panel 1 is irradiated with sunlight well. Therefore, the generated power at time t2 when the sky image Q2 is captured has hardly changed from time t1 (see FIG. 2B). Further, the number of high-luminance pixels (number of pixels h and i) is hardly changed from time t1 (see FIG. 2C).

The sky h Q3 (see FIG. 2A) captured at time t3 shows the sun h and the cloud j approaching the sun h. When the cloud j approaches the sun h in this way, sunlight is irradiated on the cloud j and scattered, and therefore a part j1 of the cloud j (a part close to the sun h) appears to shine white. In this case, since the number of pixels in the areas indicated by the symbols h, i, and j1 is the high luminance pixel number, the high luminance pixel number is increased from time t2 (see FIG. 2C).
Even in the state of the sky image Q3, since the sun h is not hidden behind the cloud j, the generated power of the photovoltaic power generation panel 1 has hardly changed from the time t2 (see FIG. 2B).

The sky h4 captured at time t4 (see FIG. 2A) shows the sun h and a cloud j that is very close to the sun h. This is the state immediately before the sun h is hidden in the cloud j. In the sky image Q4, the area of the part j2 scattered by the irradiation of sunlight in the cloud j is larger than that of the sky image Q3. That is, the number of high-luminance pixels (number of pixels h, i, j2) is increased from time t3 (see FIG. 2C).
Even in the state of the sky image Q4, since the sun h is not hidden behind the cloud j, the generated power of the photovoltaic power generation panel 1 has hardly changed since time t3 (see FIG. 2B).

In the sky image Q5 captured at time t5 (see FIG. 2A), the sun h is hidden by the cloud j. Therefore, the number of high-luminance pixels (the number of pixels indicated by i) is greatly reduced as compared with the case of the sky image Q4 (see FIG. 2C). That is, the number of high-luminance pixels shown in FIG. 2C increases in the process where the cloud j approaches the sun h (time t2 to t4), reaches a peak just before the sun h is hidden by the cloud j (time t4), Thereafter, the sun h rapidly decreases due to hiding in the cloud j (time t4 to t5).
Further, as shown in the sky image Q5, the sun h is hidden behind the cloud j, so that the amount of sunlight irradiated to the photovoltaic power generation panel 1 is rapidly reduced. As a result, the power generated by the photovoltaic power generation panel 1 also decreases sharply (time t4 to t5 in FIG. 2B).

  Thus, before the generated power of the photovoltaic power generation panel 1 sharply decreases, sunlight is irradiated to the cloud j approaching the sun h and scattered, thereby increasing the number of high-luminance pixels of the sky image. The generated power rapid decrease sign detection device 5 shown in FIG. 1 increases the number of high-luminance pixels in the sky image (time t2 to t4 in FIG. 2 (c)), and the generated power of the photovoltaic power generation panel 1 rapidly decreases (FIG. 2). This is used as a sign when (b) time t4 to t5).

Next, returning to FIG. 1, the configuration of the generated power rapid decrease sign detection device 5 will be described. As shown in FIG. 1, the generated power rapid decrease sign detection device 5 includes a communication processing unit 51, a storage unit 52, and an arithmetic processing unit 53.
The communication processing unit 51 receives the sky image information transmitted from the image generation device 4 and is connected to the power control device 2 and the image generation device 4 via the network E.
The storage unit 52 stores a program for operating the arithmetic processing unit 53, sky image information received by the communication processing unit 51, information on the number of high luminance pixels of each sky image, and the like.

The arithmetic processing unit 53 performs arithmetic processing based on the sky image information input via the communication processing unit 51, and includes a high luminance pixel number counting unit 531, a high luminance pixel number change rate calculating unit 532, and a sudden decrease. A sign determination unit 533.
The high luminance pixel number counting unit 531 has a function of counting the high luminance pixel number P _t of the sky image with respect to the sky image information acquired from the image generation device 4. As described above, the high-luminance pixel number P _t means the number of pixels whose luminance value is equal to or greater than a predetermined luminance threshold (the subscript “t” represents the sky image capturing time). . This luminance threshold value is set in advance so that a portion of the cloud j (see FIG. 2A) where sunlight is scattered can be distinguished from other portions. Note that a pixel in which the luminance values of all three primary colors of red, green, and blue are equal to or higher than a predetermined value may be a high luminance pixel.

The high luminance pixel number change rate calculation unit 532 has a function of calculating a temporal change rate with respect to the number of high luminance pixels, and includes a difference calculation unit 532a and a difference moving average calculation unit 532b.
Difference calculating unit 532a calculates the high luminance pixel count P _t of the empty image, one frame high luminance pixel count P _t-1 of the previous empty image, the difference _{PD t = P t -P t-} 1. This difference PD _t corresponds to the amount of change in the area of the portion of the sky image that is shining white.

The difference moving average calculation unit 532b relates to the difference moving average MA _t (high luminance pixel number) for one frame regarding the difference PD _t (= P _t −P _t−1 ) of the high luminance pixel number calculated by the difference calculation unit 532a. (Temporal change rate). In this embodiment, the difference moving average MA _t = (PD _t + PD _t−1 ) / 2, and the average value of the difference PD _t−1 and the difference PD _t that are temporally adjacent is set as the difference moving average MA _t . By calculating this way the difference moving average MA _t, the high-brightness pixel number temporally smoothed to remove noise, thereby preventing an erroneous determination of the sudden decrease sign determination section 533 to be described later.

Rapid decrease sign determination unit 533, the difference moving average MA _t calculated by the difference moving average calculation unit 532b determines whether the predetermined rate of change threshold MA1 (> 0) or higher. This change rate threshold value MA1 is a threshold value that serves as a criterion for determining whether or not the area of the portion of the cloud j where sunlight is scattered is increasing at a predetermined speed or higher.

If the state difference moving average MA _t is the rate of change threshold MA1 above continues for a predetermined time Delta] t _alpha above, sharply sign determination unit 533 determines the photovoltaic panel 1 that "there is rapid decrease sign of generated power". The predetermined time Δt _α is a threshold value that is a criterion for determining whether or not the sun h is hidden by the approaching cloud j.
The sudden decrease sign determination unit 533 outputs a determination result regarding the sudden decrease sign of the generated power of the photovoltaic power generation panel 1 to the communication processing unit 51. This determination result is transmitted to the power control apparatus 2 via the network E by the communication processing unit 51.

<Operation of solar power generation system>
Next, as the operation of the solar cell system, the operation of the generated power rapid decrease sign detection device 5 will be described with reference to FIGS. 3 and 4, and then the operation of the power control device 2 will be described with reference to FIG.

(Operation of the power generation rapid decrease sign detector)
FIG. 3 is a flowchart illustrating processing executed by the arithmetic processing unit of the generated power rapid decrease sign detection device. Note that at the time of “START”, it is assumed that the sun h (see FIG. 2) is not hidden by the cloud j and that the solar power generation panel 1 is well irradiated with sunlight.
In step S101, the arithmetic processing unit 53 sets n = 0. Note that the value n is an integer that is incremented when the difference moving average MA _t is greater than or equal to the change rate threshold value MA1 in step S106 (S107).

  In step S <b> 102, the arithmetic processing unit 53 determines whether or not sky image information has been acquired from the image generation device 4. As described above, the image generation apparatus 4 transmits the sky image information in time series via the network E. When the sky image information is acquired from the image generation device 4 (S102 → Yes), the processing of the arithmetic processing unit 53 proceeds to step S103. On the other hand, when an empty image has not been acquired from the image generation device 4 (S102 → No), the arithmetic processing unit 53 repeats the process of step S102.

Processing unit 53 in step S103, the high-brightness pixel number counting section 531, the sky image acquired in step S102 to count the high luminance pixel count P _t (high luminance pixel count counting process). Arithmetic processing unit 53, a high luminance pixel count P _t counted, stored in the storage unit 52 in association with the time information at the time of imaging.
In step S104, the arithmetic processing unit 53 uses the difference calculation unit 532a to increase the number of high-luminance pixels P _{t-1 of the} sky image one frame before (for example, imaged five seconds ago) and the sky image acquired this time. A difference PD _t (= P _t −P _t−1 ) between the number of luminance pixels P _t is calculated.

Processing unit 53 in step S105, the difference moving average calculation unit 532b, calculates the difference moving average MA _t representing the temporal change rate of high-brightness pixel number (high luminance pixel count change rate calculation processing). That is, the arithmetic processing unit 53 calculates an average value (PD _t + PD _t−1 ) / 2 of the difference PD _t−1 and the difference PD _t that are temporally adjacent, and sets the value as the difference moving average MA _t In S <b> 106, the arithmetic processing unit 53 determines whether or not the difference moving average MA _t calculated in Step S <b> 105 is greater than or equal to a predetermined change rate threshold MA <b> 1 (> 0) by the sudden decrease sign determination unit 533. That is, the arithmetic processing unit 53 determines whether or not the area of the white bright portion in the sky image has increased at a predetermined speed or more.

When the difference moving average MA _t is greater than or equal to the change rate threshold value MA1 (S106 → Yes), the processing of the arithmetic processing unit 53 proceeds to step S107.
In step S107, the arithmetic processing unit 53 increments the value n.
In step S108, the arithmetic processing unit 53 determines whether or not the value n has reached the threshold value N. That is, the arithmetic processing unit 53 determines whether or not the state in which the change rate of the number of high-luminance pixels is equal to or greater than the change rate threshold value MA1 has continued for a predetermined time Δt _α (rapid decrease sign determination process). Here, the predetermined time Δt _α is represented by Δt _α = Δt × N using the imaging period Δt of the sky image (see FIG. 2).

When the value n reaches the threshold value N (S108 → Yes), the processing of the arithmetic processing unit 53 proceeds to step S109. In this case, it can be said that the number of high-luminance pixels in the sky image is continuously increasing, and the cloud j is approaching the sun h. In step S <b> 109, the arithmetic processing unit 53 determines that “there is a sign of a sudden decrease in generated power” of the photovoltaic power generation panel 1 by the sudden decrease sign determination unit 533.
On the other hand, when the value n has not reached the threshold value N (S108 → No), the processing of the arithmetic processing unit 53 returns to step S102.

Further, when the difference moving average MA _t is less than the threshold rate of change value MA1 in the step S106 (S106 → No), the processing of the arithmetic processing unit 53 proceeds to step S110.
In step S110, the arithmetic processing unit 53 resets the value n to 0. That is, the arithmetic processing unit 53 returns the difference moving average MA _t change rate threshold value MA1 over a is the state of the duration of the (= Δt × n) to zero.

In step S <b> 111, the arithmetic processing unit 53 determines, by the rapid decrease predictor determination unit 533, that there is no “predictive sign of generated power” of the photovoltaic power generation panel 1.
In step S112, the arithmetic processing unit 53 transmits the determination result of step S109 or step S110 to the power control apparatus 2 via the communication processing unit 51. After performing the process of step S112, the process of the arithmetic processing unit 53 returns to “START” (RETURN).

Next, the relationship between the number of high-luminance pixels, the difference moving average, and the change in generated power and the operation of the arithmetic processing unit 53 will be described with reference to FIG.
FIG. 4A is a graph showing changes in the number of high luminance pixels. 4A, the sun h is away from the cloud j in the period A, the sun h approaches the cloud j in the period B, the sun h is hidden in the cloud j in the period C, and the sun h is hidden in the period D. After appearing from the cloud j, the cloud j is separated from the sun h.
Of the sky images shown in FIG. 2A, the sky images Q1 and Q2 correspond to the period A, the sky images Q3 and Q4 correspond to the period B, and the sky image Q5 corresponds to the initial period C.

In the period B shown in FIG. 4A, since the cloud j is approaching the sun h (the sky images Q3 and Q4 in FIG. 2A), the number of high-luminance pixels increases due to the scattering of sunlight.
FIG. 4B is a graph showing changes in the difference moving average of the number of high luminance pixels. As described above, in the period B, since the number of high-luminance pixels increases, the difference moving average that is the temporal change rate becomes a positive value. In the example shown in FIG. 4B, the difference moving average of the number of high-luminance pixels is equal to or higher than the above-described change rate threshold MA1 between times t12 and t14 (S106 → Yes). That is, from time t12 to t14, the area of the white bright portion in the sky image continuously increases (the cloud j approaches the sun h).

Further, in the period B in FIG. 4B, the state in which the difference moving average is equal to or greater than the change rate threshold value MA1 continues from the time t12 for a predetermined time Δt _α (S108 → Yes). Therefore, at time t13, which is a predetermined time Δt _α after time t12, the rapid decrease predictor determination unit 533 determines that “a sudden decrease in generated power is predicted” (S109).

  In the period C, since the sun h is hidden by the cloud j (see the sky image Q5 in FIG. 2A), the number of high-luminance pixels becomes substantially constant after suddenly decreasing (see FIG. 4A), and the change The differential moving average, which is a rate, becomes substantially zero after becoming a negative value (see FIG. 4B). Moreover, since the solar radiation amount to the solar power generation panel 1 decreases rapidly in the period C, the generated power also decreases rapidly (see FIG. 4C).

Further, in the period D, the number of high-luminance pixels rapidly increases immediately after the sun h emerges from the cloud j (see FIG. 4A), and the difference moving average that is the rate of change also instantaneously becomes a large value (see FIG. 4). 4 (b)).
However, as described above, the number of high-luminance pixels reaches a peak when the sun h is closest to the cloud j, and thereafter, the degree of scattering decreases as the cloud j moves away from the sun h (high The number of luminance pixels immediately starts to decrease). That is, the duration during which the difference moving average is greater than or equal to the change rate threshold MA1 in the period D is shorter than the predetermined time Δt _α (S108 → No). Therefore, in this case, the sudden decrease predictor determination unit 533 determines that “there is no sign of sudden decrease in generated power” (S111).

(Operation of power control device)
FIG. 5 is a flowchart illustrating processing executed by the power control apparatus.
In step S <b> 201, the power control device 2 determines whether or not a signal indicating “there is a sudden decrease in generated power” is received from the generated power rapid decrease sign detection device 5. When the signal “There is a sign of a sudden decrease in generated power” is not received (S201 → No), the processing of the power control apparatus 2 proceeds to step S202.

  In step S202, the power control device 2 executes normal control. That is, the power control device 2 converts the generated power (DC power) of the photovoltaic power generation panel 1 into AC power, and supplies this AC power to the power system K. In addition, the power control device 2 charges the storage battery 3 with a surplus of the generated power of the solar power generation panel 1 or charges the storage battery 3 with power from the power system K at a predetermined time (for example, at night). After executing the process of step S202, the process of the power control apparatus 2 returns to “START” (RETURN).

When the signal “There is a sign of sudden decrease in generated power” is received from the generated power rapid decrease sign detection device 5 in step S201 (S201 → Yes), the processing of the power control device 2 proceeds to step S202.
In step S <b> 203, the power control device 2 acquires the remaining amount of the storage battery 3. The remaining amount of the storage battery 3 is calculated based on, for example, the terminal voltage of the storage battery 3 input from a voltage sensor (not shown).
In step S <b> 204, the power control device 2 sets the discharge power to the power system K according to the remaining amount of the storage battery 3. That is, the power control device 2 sets the discharge power to the power system K to a larger value as the remaining amount of the storage battery 3 is larger. As a result, it is possible to appropriately discharge the storage battery 3 according to the sudden decrease in the generated power while supplementing the decrease in the generated power of the photovoltaic power generation panel 1 with the discharge from the storage battery 3.
Note that the discharge power of the storage battery 3 can be set so that the decrease in the generated power of the photovoltaic power generation panel 1 can be compensated for by the next charging in consideration of the frequency with which the sun h is hidden in the cloud j during the day. preferable.

In step S205, the power control apparatus 2 discharges the storage battery 3 based on the discharge power set in step S204. In the example illustrated in FIG. 4C, the power control device 2 starts discharging the storage battery 3 immediately after time t <b> 13 when the sudden decrease predictor determination unit 533 determines “there is a sudden decrease in generated power”.
Discharge power (DC power) from the storage battery 3 is converted into AC power by the power control device 2, and this AC power is supplied to the power system K. Thereby, the decrease in the generated power of the photovoltaic power generation panel 1 can be supplemented with the discharged power from the storage battery 3 (see period C in FIG. 4C: broken line).
Although omitted in FIG. 5, the power control device 2 stops discharging the storage battery 3 when the generated power of the solar power generation panel 1 is recovered by the sun h coming out of the cloud j.

<Effect>
According to the present embodiment, by using a phenomenon in which sunlight is applied to the cloud j and scattered when the cloud j approaches the sun h (that is, a phenomenon in which the number of high-luminance pixels in the sky image increases). Therefore, it is possible to appropriately detect a sign of a sudden decrease in the generated power of the photovoltaic power generation panel 1. That is, a sign of a sudden decrease in generated power can be detected by simple processing such as comparison with a threshold (S106, S108) without performing complicated image processing as in Patent Document 1.

  Also, as shown in FIG. 4B, the sudden decrease predictor determination unit 533 determines that “the generated power has a sudden decrease predictor” at time t13 before time t14 when the sun h is hidden in the cloud j. . In this way, a sign of a sudden decrease in the generated power of the photovoltaic power generation panel 1 is detected before the sun h is actually hidden in the cloud j, and immediately after that, the power control device 2 starts discharging the storage battery 3. As described above, since the discharge of the storage battery 3 is started at an appropriate timing, the decrease in the generated power of the solar power generation panel 1 can be supplemented with the discharge power from the storage battery 3. Therefore, power can be stably supplied to the power system K, and thus frequency fluctuations of the power system K can be suppressed.

In addition, by appropriately setting a predetermined time Δt _α (corresponding to the threshold value N of S108: see FIG. 4) used for detecting a sign of a sudden decrease in generated power, It is possible to distinguish appropriately from cases other than. This is because when the cloud j approaches the sun h, the sunlight is applied to the cloud j and scatters, so that the number of high-luminance pixels continuously increases (period B in FIGS. 4A and 4B). See).

  In addition, when a signal “There is a sign of sudden decrease in generated power” is received from the generated power rapid decrease sign detection device 5, the power control device 2 increases the discharge power to the power system K as the remaining amount of the storage battery 3 increases. Set. Thereby, while mitigating the influence of the sudden decrease in the generated power of the photovoltaic power generation panel 1, the discharge power is suppressed when the remaining amount of the storage battery 3 is relatively small. Can be appropriately discharged.

≪Modification≫
The solar power generation system S and the like according to the present invention have been described in the above embodiment, but the present invention is not limited to these descriptions, and various modifications can be made.
For example, in the above-described embodiment, the case where the predetermined time Δt _α used for detecting the sign of a sudden decrease in generated power is constant has been described, but the present invention is not limited thereto. That is, the weather information regarding the wind speed above the solar power generation panel 1 may be acquired via the communication processing unit 51, and the calculation processing unit 53 may set the predetermined time Δt _α based on the wind speed. That is, the arithmetic processing unit 53 sets the predetermined time Δt _α shorter as the wind speed increases. Thereby, for example, even when the speed at which the cloud j approaches the sun h is high due to the strong wind, it is possible to accurately detect a sign of a sudden decrease in generated power.

Further, in the embodiment, the generated power sharply warning detection device 5, a high luminance pixel count of the difference PD _n-1, the average value of the _{PD n (PD n + PD n} -1) ÷ 2 difference moving average calculation unit for calculating a Although the case where 532b is provided has been described, the present invention is not limited to this. That is, the difference moving average calculation unit 532b is omitted, the sky image capturing period Δt is made relatively long, and the difference PD _n of the number of high brightness pixels in the image capturing period Δt is _expressed as “rate of change in number of high brightness pixels over time”. May be considered.

Further, in the above embodiment, when the signal “there is a sign of sudden decrease in generated power” is received from the generated power rapid decrease sign detection device 5, the power control device 2 sets the discharge power according to the remaining amount of the storage battery 3. However, the present invention is not limited to this. That is, the discharge power of the storage battery 3 may be a fixed value.
Moreover, it may replace with the storage battery 3 shown in FIG. 1, and you may make it the structure provided with the electric power generating apparatus (for example, gas engine generator) connected to the electric power control apparatus 2. FIG. In this case, the power control device 2 drives the above-described power generation device when receiving a signal indicating “a sudden decrease in generated power is predicted” from the generated power rapid decrease sign detection device 5. By supplying the power generated by the power generation apparatus to the power system K, the decrease in the power generated by the photovoltaic power generation panel 1 can be compensated.

1 may be realized by hardware by designing a part or all of them with an integrated circuit, for example. In addition, each of the above-described configurations may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tapes, and files that realize each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD. .
The functions described above include a high-luminance pixel number counting process (S103), a high-luminance pixel number change rate calculation process (S104, S105), and a sudden decrease sign determination process (S106 to S106) executed by the generated power rapid decrease sign detection device 5. S109).

  Further, the control lines and information lines shown in FIG. 1 are those that are considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

DESCRIPTION OF SYMBOLS S Photovoltaic power generation system 1 Photovoltaic power generation panel 2 Power control device 3 Storage battery 4 Image generation device 5 Generated power rapid decrease sign detection device 41 Camera (imaging means)
42 Communication Processing Unit 51 Communication Processing Unit 52 Storage Unit 53 Arithmetic Processing Unit 531 High Brightness Pixel Number Counting Unit 532 High Brightness Pixel Number Change Rate Calculation Unit 532a Difference Calculation Unit 532b Difference Moving Average Calculation Unit 533 Rapid Decrease Prediction Determination Unit K Power System h Sun j clouds

Claims (5)

The number of pixels whose luminance value is equal to or higher than a predetermined luminance threshold is counted as the number of high luminance pixels among the sky images that are installed in the vicinity of the photovoltaic power generation panel and are input in time series from at least the imaging means for imaging the sun. A high-intensity pixel number counting unit,
A high-brightness pixel number change rate calculating unit that calculates a temporal change rate of the high-brightness pixel number counted by the high-brightness pixel number counting unit;
When the state in which the change rate calculated by the high-brightness pixel number change rate calculation unit is equal to or higher than a predetermined change-rate threshold indicating an increase in the number of high-brightness pixels continues for a predetermined time or longer, A power generation rapid decrease sign detection device comprising: a sudden decrease sign determination unit that determines that there is a sudden decrease sign of generated power. The generated power rapid decrease sign detection device according to claim 1,
The solar power generation panel generating power by being irradiated with sunlight;
A power control device electrically connected to the photovoltaic power generation panel, the power system, and the storage battery,
The power control device
While supplying the power generated by the photovoltaic power generation panel to the power system,
The solar power generation system characterized by supplying the electric power of the storage battery to the electric power system when the sudden decrease sign determination unit determines that there is the sudden decrease sign. The power control device
3. The photovoltaic power generation according to claim 2, wherein, when the sudden decrease predictor determination unit determines that there is the sudden decrease sign, the discharge power of the storage battery is set to a larger value as the remaining amount of the storage battery is larger. system. The number of pixels whose luminance value is equal to or higher than a predetermined luminance threshold is counted as the number of high luminance pixels among the sky images that are installed in the vicinity of the photovoltaic power generation panel and are input in time series from at least the imaging means for imaging the sun. High luminance pixel number counting process,
A high luminance pixel number change rate calculation process for calculating a temporal change rate of the high luminance pixel number counted by the high luminance pixel number counting process;
When the state in which the change rate calculated by the high-brightness pixel number change rate calculation process is equal to or higher than a predetermined change-rate threshold indicating an increase in the number of high-brightness pixels continues for a predetermined time or longer, A method for detecting a sign of sudden decrease in generated power, which comprises:   A non-transitory computer-readable storage medium storing a program for causing a computer to execute the method for detecting a sign of sudden decrease in generated power according to claim 4.

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