JP2014226025A - Concentrating photovoltaic power generation system and method for detecting tracking deviation, and method for correcting tracking deviation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for finding deviation in tracking the sun in concentrating photovoltaic power generation.SOLUTION: A concentrating photovoltaic power generation system comprises: a concentrating photovoltaic power generation panel 1; a drive apparatus 200 for making the concentrating photovoltaic power generation system track movement of the sun; and a control apparatus 400 which, when predetermined insolation conditions for the concentrating photovoltaic power generation panel 1 is satisfied, detects whether there is any tracking deviation by detecting fluctuation patterns repeatedly generated in a change with time of power generated by the concentrating photovoltaic power generation panel 1 and by comparing the detected fluctuation pattern with a peculiar form of a deviation in an azimuth angle and with a peculiar form of a deviation in an elevation angle.

Description

  The present invention relates to a concentrator photovoltaic (CPV) that generates power by concentrating sunlight on a power generation element.

  The concentrating solar power generation is based on a configuration in which sunlight condensed by a lens is incident on a power generation element (solar cell) made of a small compound semiconductor having high power generation efficiency. Specifically, for example, a configuration in which a plurality of electric power generating elements mounted on an insulating substrate such as ceramic with wiring are arranged at a light collecting position, and the generated power on each insulating substrate is collected by electric wires. (For example, see Non-Patent Document 1).

  When such a basic configuration is a concentrating solar power generation module, a plurality of such modules are arranged to form a concentrating solar power generation panel. A desired generated power can be obtained by performing a tracking operation so that the entire concentrating solar power generation panel is always directed to the sun by the driving device. Basically, the tracking operation relies on a tracking sensor and estimation of the position of the sun based on the latitude, longitude, and time of the installation location. Regarding the installation error of equipment, a proposal has been made to absorb this by software (see, for example, Patent Document 1).

JP 2009-186094 A

"Failure Modes of CPV Modules and How to Test for Them", [online], February 19, 2010, Emcore Corporation, [Search March 7, 2013], Internet <URL: http: //www1.eere .energy.gov / solar / pdfs / pvrw2010_aeby.pdf # search = 'emcore Pointfocus Fresnel Lens HCPV System'〉

However, it cannot be said that the tracking sensor has no error at all, and tracking deviation may occur. In addition, due to long-term use, tracking deviation may occur due to distortion generated on the concentrating solar power generation panel or the gantry supporting the same.
However, even if a slight tracking shift occurs, the generated power can be obtained as long as the collected sunlight does not shift so much that it completely disengages the power generation element. For this reason, it is difficult to find that the tracking error has occurred. In addition, there has not been proposed a method for making such a determination as to how the deviation is made.

  In view of such a problem, an object of the present invention is to provide a technique for discovering a shift in tracking of the sun in at least concentrating solar power generation.

  The concentrating solar power generation system of the present invention includes a concentrating solar power generation panel, a driving device that causes the concentrating solar power generation panel to perform a tracking operation with respect to the sun, and the concentrating solar power generation panel. When a predetermined solar radiation condition is satisfied, a variation pattern repeatedly generated due to a temporal change in generated power in the concentrating solar power generation panel is detected, and the detected variation pattern has a form and an elevation angle peculiar to a deviation in azimuth. And a control device for detecting the presence or absence of tracking deviation by comparing with a form peculiar to the deviation.

  In the concentrating solar power generation system described above, based on the knowledge that the fluctuation pattern that occurs repeatedly with the aging of the generated power includes information about tracking deviation, the detected fluctuation pattern is specific to the azimuth deviation. By comparing with the form peculiar to the above and the form peculiar to the elevation angle deviation, it is possible to detect the presence or absence of the tracking deviation. Therefore, it is possible to find a shift in the tracking of the sun from the change with time of the generated power.

  Further, the present invention is a method for detecting a tracking shift in a concentrating solar power generation apparatus provided with a driving device that causes the concentrating solar power generation panel to perform a sun tracking operation, the concentrating solar power generation panel When a predetermined solar radiation condition is satisfied, a variation pattern included in a change with time of the generated power of the concentrating solar power generation panel is detected, and the detected variation pattern has a form peculiar to a deviation in azimuth and This is a tracking deviation detection method for detecting the presence or absence of tracking deviation by comparing with a form peculiar to elevation deviation.

  In the tracking deviation detection method described above, based on the knowledge that the fluctuation pattern that occurs repeatedly with the aging of the generated power includes information about the tracking deviation, the detected fluctuation pattern has a form specific to the azimuth deviation. And by comparing with a form peculiar to the deviation of the elevation angle, it is possible to detect the presence or absence of the tracking deviation. Therefore, it is possible to find a shift in the tracking of the sun from the change with time of the generated power.

  Further, the present invention provides a concentrating solar power generation apparatus including a driving apparatus that causes the concentrating solar power generation panel to perform a sun tracking operation, and detects and drives the generated power of the concentrating solar power generation panel. A tracking deviation correction method executed by a control device that controls the device, wherein power generation of the concentrating solar power generation panel is performed when a predetermined solar radiation condition for the concentrating solar power generation panel is satisfied Detecting the presence or absence of tracking deviation by detecting the fluctuation pattern included in the change in power over time, and comparing the detected fluctuation pattern with a form peculiar to a deviation in azimuth and a form peculiar to a deviation in elevation angle, This is a tracking deviation correction method in which, when there is a deviation, an axis in which deviation occurs among the two axes of the azimuth angle and the elevation angle is specified, and the drive device is instructed to correct the angle on the specified axis.

  In the tracking deviation correction method described above, based on the knowledge that the fluctuation pattern that repeatedly occurs with the aging of the generated power includes information about the tracking deviation, the detected fluctuation pattern has a form specific to the azimuth deviation. And compare with the form peculiar to the deviation of elevation angle. As a result of the comparison, if there is no sign of tracking deviation in the fluctuation pattern, tracking is performed normally. If there is a deviation as a result of the comparison, the axis in which the deviation is generated is identified from the two axes of the azimuth angle and the elevation angle from the similarity of the variation pattern form, and the correction of the angle in the identified axis is driven. Instruct the device. As a result, the deviation is accurately corrected. Therefore, it is possible to provide a technique for finding a deviation in the tracking of the sun from the change with time of the generated power and eliminating the deviation.

  According to the concentrating solar power generation system and the tracking deviation detection method of the present invention, it is possible to find the sun tracking deviation from the fluctuation pattern of the generated power in the concentrating solar power generation.

It is a perspective view which shows an example of a concentrating solar power generation device. It is a perspective view (partially fractured) which expands and shows an example of a concentrating solar power generation module. It is an enlarged view of the III section in FIG. It is a perspective view which shows the state which arranged 15 units | sets in the site | area as a concentrating type solar power generation device "one unit" which comprised 64 modules (length 8 x width 8) in a generally square shape. It is a graph which shows the measured value of the generated electric power of 15 concentrating solar power generation devices in the time zone (11 o'clock to 12 o'clock) near the time of the sun in the sun on a certain day. It is four graphs which extracted the characteristic fluctuation pattern of the waveform. It is a projection figure which shows the graph of a pattern (a), and the position where a condensing spot is formed on an electric power generation element. It is a projection figure which shows the position where the graph of a pattern (b), and a condensing spot are formed on an electric power generation element. It is a projection figure which shows the graph of a pattern (c), and the position where a condensing spot is formed on an electric power generation element. It is a projection figure which shows the position where the graph of a pattern (d), and a condensing spot are formed on an electric power generation element. It is the graph which investigated how the generated electric power fell in the period from the time tracking is stopped in the vicinity of the south and middle time when the elevation angle hardly changes until the tracking is restarted. It is a figure which shows the example of correction | amendment of an elevation angle. It is a figure which shows an example of the concentrating solar power generation system seen from the point of tracking operation | movement. It is a flowchart (1/2) which shows the process regarding the detection and correction | amendment of tracking deviation performed by a control apparatus. It is a flowchart (2/2) which shows the process regarding the detection and correction | amendment of tracking deviation performed by a control apparatus. It is a figure which shows the other example of the concentrating solar power generation system seen from the point of tracking operation | movement. It is a figure which shows the further another example of a concentrating solar power generation system.

[Summary of Embodiment]
The gist of the embodiment of the present invention includes at least the following.
(1) This concentrating solar power generation system includes a concentrating solar power generation panel, a drive device that causes the concentrating solar power generation panel to perform a tracking operation with respect to the sun, and the concentrating solar power generation panel. When a predetermined solar radiation condition for is satisfied, a variation pattern that repeatedly occurs due to a temporal change in the generated power in the concentrating solar power generation panel is detected, and the detected variation pattern has a form peculiar to a deviation in azimuth and And a control device that detects the presence or absence of tracking deviation by comparing with a form peculiar to elevation deviation.
In the concentrating solar power generation system described above, based on the knowledge that the fluctuation pattern that repeatedly occurs with the aging of the generated power contains information about tracking deviation, the detected fluctuation pattern is converted to the azimuth (Azimuth) By comparing with a form peculiar to the deviation and a form peculiar to the deviation of the elevation angle (Elevation), it is possible to detect the presence or absence of the tracking deviation. Therefore, it is possible to find a shift in the tracking of the sun from the change with time of the generated power.

(2) In the concentrating solar power generation system according to (1), when the tracking device has a tracking shift, the control shaft generates a shift between two axes of an azimuth angle and an elevation angle. May be specified, and the driving device may be instructed to correct the angle on the specified axis.
In this case, the misalignment is accurately corrected by specifying the axis causing the misalignment and instructing the drive device to correct the angle on the identified axis. Therefore, it is possible to provide a technique for finding a deviation in the tracking of the sun from the change with time of the generated power and eliminating the deviation.

(3) In the concentrating solar power generation system of (2), the control device has a sawtooth variation pattern included in the variation pattern,
(A) A pattern that gradually increases and decreases when the step changes, and
(B) You may make it determine the code | symbol of the angle which should be correct | amended based on which of the pattern which decreases gradually and increases at the time of a step change.
In this case, it is possible to appropriately determine whether the angle is corrected in the plus direction or in the minus direction.

(4) Moreover, in the concentrating solar power generation system of (2) or (3), the control device is based on the stored power that is stored in advance and that is reduced as viewed from the generated power when there is no deviation. The absolute value of the angle to be corrected may be determined.
In this case, for example, it is possible to deliberately cause a deviation so that the relationship between the deviation and a decrease in generated power can be accurately grasped in advance. Further, this method can be applied to any variation pattern of azimuth angle deviation or elevation angle deviation.

(5) In the concentrating solar power generation system of (2) or (3), the control device determines an absolute value of an angle to be corrected based on a change ratio of the generated power with respect to the tracking operation. You may do it.
In this case, the relationship between the deviation and the change ratio of the generated power can be accurately grasped in advance. Further, it can be applied to any variation pattern of azimuth angle deviation or elevation angle deviation. Furthermore, the present invention can be suitably applied to a fluctuation pattern in which azimuth angle deviation and elevation angle deviation are mixed.

(6) In the concentrating solar power generation system according to any one of (2) to (5), the concentrating solar power generation panel includes a direct solar radiation meter, and the control device includes the direct solar radiation The correction may be performed only when the direct solar radiation intensity detected by the meter is equal to or greater than a predetermined value.
In this case, since the correction is performed when the solar radiation is stable, the influence on the direct solar radiation intensity due to the clouds can be eliminated.

(7) Moreover, in the concentrating solar power generation system according to any one of (2) to (6), the control device may perform the correction in a time zone in which the sun goes south.
In this case, since the elevation angle is stable and becomes a substantially constant value, it is easy to detect a variation pattern based on the deviation of the azimuth angle.

(8) Moreover, in the concentrating solar power generation system in any one of said (2)-(5), a normal surface total solar radiation meter or a horizontal surface total solar radiation meter is provided as a total solar radiation meter, and a normal line In the case of a flat solar radiation meter, if the normal solar radiation intensity detected by the normal solar radiation monitor is greater than or equal to the specified value, in the case of a horizontal flat solar radiation meter, the horizontal flat solar radiation meter The correction may be performed only when the horizontal solar radiation intensity detected by is greater than or equal to a predetermined value.
In this case, the normal surface horizontal solar radiation meter or the horizontal flat surface solar radiation meter is less susceptible to the contamination of the window portion of the built-in solar radiation sensor as compared with the direct radiation solar radiation meter. In addition, the direct solar radiation meter has few problems of tracking deviation that cause measurement errors. Therefore, more accurate information may be obtained regarding actual measurement of sunlight intensity.

(9) Further, in the concentrating solar power generation system according to any one of (2) to (8), a measurement signal of a power meter that measures the generated power is transmitted and a correction signal to the driving device is received. The control device is installed at a location away from the concentrating solar power generation panel and the driving device, and communicates with the communication device via a communication line, thereby the measurement signal. And the correction signal may be transmitted.
In this case, since tracking deviation can be corrected by remote control via a communication line, the configuration is suitable for centralized management from a distance.

(10) On the other hand, when viewed as a tracking deviation detection method, it is a tracking deviation detection method in a concentrating solar power generation apparatus provided with a drive device that causes the concentrating solar power generation panel to perform a sun tracking operation. When the predetermined solar radiation condition for the concentrating solar power generation panel is satisfied, the variation pattern included in the temporal change of the generated power of the concentrating solar power generation panel is detected, and the detected variation pattern Is a tracking deviation detection method for detecting the presence or absence of tracking deviation by comparing the characteristic with the characteristic peculiar to the azimuth deviation and the characteristic peculiar to the elevation deviation.
In the tracking deviation detection method described above, based on the knowledge that the fluctuation pattern that occurs repeatedly with the aging of the generated power includes information about the tracking deviation, the detected fluctuation pattern has a form specific to the azimuth deviation. And by comparing with a form peculiar to the deviation of the elevation angle, it is possible to detect the presence or absence of the tracking deviation. Therefore, it is possible to find a shift in the tracking of the sun from the change with time of the generated power.

(11) When viewed as a tracking deviation correction method, in the concentrating solar power generation apparatus provided with a driving device that causes the concentrating solar power generation panel to perform a sun tracking operation, the concentrating solar power A tracking deviation correction method executed by a control device that detects the generated power of the power generation panel and controls the drive device, and when a predetermined solar radiation condition for the concentrating solar power generation panel is satisfied By detecting a fluctuation pattern included in the temporal change of the generated power of the concentrating solar power generation panel, and comparing the detected fluctuation pattern with a form peculiar to a deviation in azimuth and a form peculiar to a deviation in elevation angle Detecting the presence or absence of tracking deviation, if there is a deviation, identify the axis where the deviation occurs out of the two axes of azimuth and elevation, and instruct the drive device to correct the angle on the identified axis That is a correction method of tracking deviation.
In the tracking deviation correction method described above, based on the knowledge that the fluctuation pattern that repeatedly occurs with the aging of the generated power includes information about the tracking deviation, the detected fluctuation pattern has a form specific to the azimuth deviation. And compare with the form peculiar to the deviation of elevation angle. As a result of the comparison, if there is no sign of tracking deviation in the fluctuation pattern, tracking is performed normally. If there is a deviation as a result of the comparison, the axis in which the deviation is generated is identified from the two axes of the azimuth angle and the elevation angle from the similarity of the variation pattern form, and the correction of the angle in the identified axis is driven. Instruct the device. As a result, the deviation is accurately corrected. Therefore, it is possible to provide a technique for finding a deviation in the tracking of the sun from the change with time of the generated power and eliminating the deviation.

(12) Further, in the tracking deviation correction method of (11), the change with time of the generated power is measured in advance with one of the azimuth angle and the elevation angle fixed, so that the generated power can be viewed from the case where there is no deviation. The other angle shift corresponding to the generated power that has decreased may be checked.
In this case, it is possible to forcibly create a tracking deviation and easily check the angular deviation corresponding to the reduced generated power.

[Details of the embodiment]
《Example of concentrating solar power generation device》
Hereinafter, details of embodiments of the present invention will be described with reference to the drawings. First, the configuration of the concentrating solar power generation device will be described.
FIG. 1 is a perspective view showing an example of a concentrating solar power generation device. In the figure, a concentrating solar power generation apparatus 100 includes a concentrating solar power generation panel 1 and a gantry 3 including a support 3a and a foundation 3b for supporting the concentrating solar power generation panel 1 on the back side. The concentrating solar power generation panel 1 is formed by assembling a large number of concentrating solar power generation modules 1M vertically and horizontally. In this example, 62 (vertical 7 × horizontal 9-1) concentrating solar power generation modules 1M, excluding the central portion, are gathered vertically and horizontally. If the rated output of one concentrating solar power generation module 1M is about 100 W, for example, the entire concentrating solar power generation panel 1 has a rated output of about 6 kW.

  A driving device (not shown) is provided on the back side of the concentrating solar power generation panel 1, and by operating the driving device, the concentrating solar power generation panel 1 is moved to an azimuth and an elevation angle. Can be driven by two axes. Thereby, the concentrating solar power generation panel 1 is always driven using a stepping motor (not shown) so as to be directed toward the sun in both the azimuth angle and the elevation angle. A tracking sensor 4 and a direct solar radiation meter 5 are provided at any location (central portion in this example) of the concentrating solar power generation panel 1 or in the vicinity of the panel 1. The sun tracking operation is performed by using the tracking sensor 4 and the position of the sun calculated from the latitude, longitude, and time of the installation location.

  That is, the driving device drives the concentrating solar power generation panel 1 by a predetermined angle every time the sun moves by a predetermined angle. The event of moving by a predetermined angle may be determined by the tracking sensor 4 or may be determined by latitude / longitude / time. Therefore, the tracking sensor 4 may be omitted. The predetermined angle is, for example, a constant value, but the value can be changed depending on the altitude of the sun and time. In addition, the use of a stepping motor is an example, and it is also possible to use a drive source capable of precise operation.

《Example of concentrating solar power generation module》
FIG. 2 is an enlarged perspective view (partially broken) showing an example of a concentrating solar power generation module (hereinafter also simply referred to as a module) 1M. In the figure, the module 1M is like a lid on a vessel-shaped (bat-shaped) housing 11 having a bottom surface 11a, a flexible printed wiring board 12 provided in contact with the bottom surface 11a, and a flange 11b of the housing 11. The primary condensing part 13 attached to is provided as a main component. The housing 11 is made of metal.

  The primary condensing unit 13 is a Fresnel lens array, and a plurality of Fresnel lenses 13f as lens elements for condensing sunlight are formed in a matrix (for example, 192 in the 16 × 12 horizontal direction). Yes. Such a primary condensing part 13 can be formed, for example, by using a glass plate as a base material and forming a silicone resin film on the back surface (inside) thereof. The Fresnel lens is formed on this resin film. A connector 14 for taking out the output of the module 1M is provided on the outer surface of the housing 11.

  FIG. 3 is an enlarged view of a portion III in FIG. In FIG. 3, the flexible printed wiring board 12 includes a ribbon-shaped flexible substrate 121, a power generation element (solar cell) 122 thereon, and a secondary condensing unit 123 provided so as to cover the power generation element 122. I have. The same number of sets of power generation elements 122 and secondary condensing units 123 are provided at positions corresponding to the Fresnel lenses 13 f of the primary condensing unit 13. The secondary condensing unit 123 collects sunlight incident from each Fresnel lens 13 f on the power generation element 122. The secondary condensing unit 123 is, for example, a lens. However, it may be a reflecting mirror that guides light downward while reflecting light. In some cases, the secondary condenser is not used. Each power generating element 122 is electrically connected in series and parallel by the flexible printed wiring board 12, and the bundled generated power is taken out from the connector 14 (FIG. 2).

  Note that the module 1M shown in FIGS. 2 and 3 is merely shown as an example, and there may be various other configurations of the module. For example, instead of the above-described flexible printed board, a configuration using a large number of flat-plate (rectangular, etc.) resin substrates and ceramic substrates may be used.

《Examples of installing multiple concentrating solar power generation devices》
Concentrated solar power generation apparatus 100 configured as described above can freely change the panel configuration (the number and arrangement of modules 1M) as necessary. Moreover, the shape of the module can also be configured to be rectangular, square, or other shapes. For example, FIG. 4 shows a state in which 15 concentrating solar power generation devices 100 configured by arranging approximately 64 square modules (vertical 8 × horizontal 8) are arranged as “1”, and 15 are arranged in the site. It is a perspective view shown. Each group is driven to track the sun by a respective driving device (not shown). Here, the 15 concentrating solar power generation devices 100 are represented by the following symbols (also described in FIG. 4) for convenience.
4 units in the front row: 1A, 1B, 1C, 1D
4 units in the second row: 2A, 2B, 2C, 2D
5 units in the third row: 3A, 3B, 3C, 3D, 3E
Two in the fourth row: 4D, 4E

<Examples of changes in power generation over time>
FIG. 5 is a graph showing measured values of generated power of the 15 concentrating solar power generation devices 100 (1A to 4E) in a time zone (11:00 to 12:00) around the time of the sun in the sun on a certain day. is there. The horizontal axis of each graph represents time, and the vertical axis represents power. What should be noted here is not the difference between the generated powers but the characteristics of the fluctuations included in each waveform.

  That is, many waveforms have saw-toothed steps (jagged edges) indicating mechanical fluctuations, and two types of fluctuations, that is, fluctuations repeated in a short cycle and fluctuations repeated in a relatively long cycle are observed. The cause of the fluctuation is that there is a shift in tracking. In other words, when there is no deviation in tracking, the generated power does not fluctuate greatly before and after the operation of the stepping motor (tracking operation), but when there is a deviation in tracking, the generated power is changed before and after the operation of the stepping motor. Large fluctuations occur. For this reason, it is understood that the trace of the operation of the stepping motor appears as a relatively large fluctuation in the generated power. Since the graph is in the vicinity of the SST, the change in elevation angle is the least during the day. Accordingly, the longer period (2 to 5 minutes period) is due to the tracking of the elevation angle. The shorter cycle (20 seconds to 60 seconds) is due to the deviation of the azimuth tracking.

<Examples of characteristic fluctuation patterns>
FIG. 6 is four graphs obtained by extracting characteristic fluctuation patterns of the waveform. The horizontal axis of each graph represents time, and the vertical axis represents generated power. The upper left pattern (a) is a stable state where the fluctuation range of the generated power is as small as about 300 W (about 4% of the whole), the tracking deviation is small enough to allow, and a good tracking operation is performed. . FIG. 7 is a projection diagram showing a graph of the pattern (a) and a position where the condensing spot SP is formed on the power generation element 122. Moreover, the relationship between the position on a graph and a projection figure is shown with the broken line. As shown in the drawing, in the projection diagram at the left end, the condensing spot SP slightly deviates from the power generation element 122, but is generally in a good state as a whole. That is, in such a case, there is no tracking shift and no correction is necessary.

  Returning to FIG. 6, the pattern (b) in the upper right has large fluctuations between 11:56 and 57, and between 12:00:00 and 1 minute, which is as long as about 4 minutes. Repeated in a cycle. This is a trace of the operation of the stepping motor in a state where there is a deviation in the tracking of the elevation angle. FIG. 8 is a projection diagram showing a graph of the pattern (b) and a position where the condensing spot SP is formed on the power generation element 122. Moreover, the relationship between the position on a graph and a projection figure is shown with the broken line. As shown in the figure, in the left projection, the condensing spot SP is large and deviates from the power generation element 122. Thereafter, the condensing spot SP gradually enters the area of the power generation element 122, but when the stepping motor is operated, it is greatly deviated again. Therefore, in such a case, it is necessary to correct the deviation in the tracking of the elevation angle. Further, in this case, a variation pattern is composed of repeated large variations and small variations in between. The generated power tends to increase between the large fluctuation and the next large fluctuation, and the fluctuation of the generated power shows a decreasing trend during the operation of the stepping motor. Such a variation pattern indicates that the angle shift is shifted in the advance direction. Note that the smaller fluctuation range is as small as about 200 W (10% or less of the whole) at the maximum, and can be regarded as a fluctuation component, so it is not subject to correction.

  Returning to FIG. 6, the lower left pattern (c) has a large variation with a period of 20 to 30 seconds. This is a trace of the operation of the stepping motor in a state where there is a deviation in the tracking of the azimuth angle. FIG. 9 is a projection diagram showing a graph of the pattern (c) and a position where the condensing spot SP is formed on the power generation element 122. Moreover, the relationship between the position on a graph and a projection figure is shown with the broken line. The projection on the left is a state immediately after the stepping motor is operated, and the condensing spot SP is relatively well within the area of the power generation element 122. From here, the generated power gradually decreases due to the movement of the azimuth angle of the sun, and reaches the state of the right projection diagram. And again, the stepping motor operates. Therefore, in such a case, it is necessary to correct the deviation of the azimuth tracking. Further, in this case, the fluctuation of the substantially constant gradient between the large fluctuations shows a decreasing tendency, and the fluctuation of the generated electric power shows an increase in the stepping motor operation. Such a variation pattern indicates that the angular deviation is shifted in the delay direction.

  Returning to FIG. 6, the lower right pattern (d) is a composite type of the patterns (b) and (c). That is, here, there is a shift in both azimuth angle tracking and elevation angle tracking. FIG. 10 is a projection diagram showing a graph of the pattern (d) and a position where the condensing spot SP is formed on the power generation element 122. Moreover, the relationship between the position on a graph and a projection figure is shown with the broken line. As shown in the drawing, in both the left projection diagram and the right projection diagram, the condensing spot SP is relatively large and deviates from the area of the power generation element 122 (however, the right projection is slightly smaller.) . Therefore, in such a case, it is necessary to correct the deviation of the azimuth tracking and the deviation of the elevation tracking. Between the large fluctuation around 11:57 and the next big fluctuation around 12:10 seconds, the generated power tends to increase as a whole. ing. This happens in a long cycle of about 3 minutes. Also, it is a medium size that occurs around 11:56:15, around 11:57:02, around 11:57:48, around 11:58:34, and around 11:59:20. Between each fluctuation, the generated power tends to decrease, and the change during operation of the stepping motor corresponding to the middle fluctuation shows an increasing direction. This moderate fluctuation occurs with a period of about 46 seconds. The former corresponds to the elevation angle deviation, and the latter corresponds to the azimuth angle deviation. In such a case, it is possible to first correct one of the deviation angles and then return to the start point of the procedure, or to correct the deviation angle of the other axis before returning to the start point. Is possible. Note that small fluctuations (less than 10% of the whole) with fluctuation amounts of less than 100 W can be regarded as fluctuation components and are not subject to correction.

<Summary of fluctuation patterns>
As described above, it has been found that the fluctuation pattern repeatedly generated in the temporal change in the generated power includes information on tracking deviation. If there is no sign of tracking deviation in the variation pattern (pattern (a)), tracking is performed normally. In addition, the presence or absence of tracking deviation is detected by comparing the detected variation pattern with a form peculiar to elevation deviation (pattern (b)) and a form peculiar to azimuth deviation (pattern (c)). Can do.
Further, by comparison, it is possible to specify the axis that causes the deviation among the two axes of the azimuth angle and the elevation angle from the similarity of the form of the variation pattern. Then, it is possible to correct the tracking angle by correcting the angle on the specified axis. In addition, as a specific comparison method, for example, by detecting a period of fluctuation that causes a large fluctuation width exceeding a threshold value, the sun and the sun at a certain angle in the elevation direction or azimuth direction at that time Judgment is possible by comparing the time required to move.

  As described above, based on the fluctuation pattern of the generated power, detection of the presence or absence of tracking deviation, identification of the axis (azimuth angle / elevation angle) where the tracking deviation occurs, the direction of fluctuation, that is, the sawtooth shape included in the fluctuation pattern The angle to be corrected is based on whether the variation pattern of (a) is a pattern that gradually increases and decreases when the step changes, or (b) a pattern that gradually decreases and increases when the step changes. However, in order to perform appropriate correction, it is preferable to know the absolute value (correction amount) of the angle to be corrected.

<How to determine the correction amount 1>
Here, a method 1 for determining the correction amount in the case of the pattern (b) or (c) will be described. Pattern (b) or (c), that is, when the tracking deviation is either the elevation angle or the azimuth angle, by measuring the change over time in the generated power with one of the elevation angle and the azimuth angle fixed in advance, It is possible to investigate the deviation of the other angle corresponding to the generated power that is reduced from the generated power when there is no deviation. As a result, a tracking deviation can be forcibly created, and an angular deviation corresponding to the reduced generated power can be easily checked.

For example, FIG. 11 shows how the generated power decreases during the period from when tracking is stopped near the south-central time when the elevation angle hardly changes until the tracking is restarted (OFF-AXIS period). It is the graph which investigated about. Due to the tracking stop (time 12:05), the tracking deviation of the azimuth angle gradually increases, and the generated power decreases accordingly. Therefore, by performing such an experiment in advance, back data (correction amount derivation data) indicating a correspondence relationship between the decrease in generated power and the amount of azimuth angle deviation can be obtained.
Table 1 below is an example of back data indicating the relationship between the angle deviation amount D and the generated power ratio RA.

  The above power generation power ratio is obtained after normalization by solar radiation intensity. RA is (power generation when there is a deviation) / (power generation when the deviation is zero). When both the Fresnel lens and the power generation element are square, the relationship of the generated power ratio RA to the shift amount D is the same for both the elevation angle and the azimuth angle, and the same data can be used for determining the correction amount. If the relationship is not the same, such data may be prepared for each of the elevation angle and the azimuth angle.

  Further, the deviation amount and the generated power ratio before and after driving when the tracking base is step driven (driven by a stepping motor) are as shown in Table 2 below, for example.

The above power generation power ratio is obtained after normalization by solar radiation intensity. In this example, the step drive angle is about 0.35 degrees. If power generation decreases due to step drive,
RB = (power generation amount after step driving) / (power generation amount before step driving). If power generation increases due to step drive,
RB = (power generation amount before step driving) / (power generation amount after step driving).
When both the Fresnel lens and the power generation element are square, the relationship between the generated power ratio RB and the deviation amount D is the same for both the elevation angle and the azimuth angle, and the same data can be used for determining the correction amount. If the relationship is not the same, such data may be prepared for each of the elevation angle and the azimuth angle.

By utilizing such data, it is possible to determine the absolute value of the angle to be corrected when tracking deviation occurs based on the generated power that is reduced as seen from the generated power when there is no deviation. In the example of FIG. 11, strictly speaking, a decrease in generated power due to a deviation in elevation angle is included, but it is ignored because it is considerably smaller than a deviation in azimuth angle. However, in order to further improve the accuracy, for example, if only the tracking of the azimuth angle is stopped and the tracking of the elevation angle is continued, a decrease in the generated power due to only the deviation of the azimuth angle can be examined in advance.
On the contrary, if only the elevation angle tracking is stopped and the azimuth angle tracking is continued, it is possible to investigate a decrease in the generated power due to only the elevation angle deviation. This method may be applied to the case of the pattern (d), but since the error increases when the combined degree of azimuth angle deviation and elevation angle deviation is large, the following method may be applied.

<How to determine the correction amount 2>
Next, a method 2 for determining a correction amount applicable in any of the patterns (b), (c), and (d) will be described. In other words, this method can be applied not only in the case where there is a tracking shift in only one of the azimuth angle / elevation angle but also in the case where both tracking shifts are mixed. First, from a state where there is no deviation in either azimuth angle or elevation angle, a rotation operation of an azimuth angle of, for example, 0.1 degree which is the minimum rotation angle by the stepping motor is performed, and the change ratio of the generated power before and after the operation Record. Next, for example, from a state where the azimuth angle is shifted by Δθ, the stepping motor rotates the azimuth angle of 0.1 degree, and the change ratio of the generated power before and after the operation is recorded. Back data (correction amount derivation data) obtained by recording such a recording up to a predetermined angle (expected maximum deviation angle) is prepared in advance. In other words, this is to check the change ratio (gradient) of the generated power with respect to the unit rotation angle by the stepping motor according to the tracking deviation. As the tracking deviation increases, the change ratio also increases. Therefore, if the change ratio is detected, the absolute value of the deviation angle can be obtained. Back data (correction amount derivation data) is prepared in advance in the same manner in the elevation direction.

  Based on the back data (correction amount derivation data), for example, if the actual fluctuation of the generated power with respect to the rotation operation with an azimuth angle of 0.1 degrees is collated with the azimuth angle back data (correction amount derivation data) , It turns out how many azimuths are deviated. Similarly, when the fluctuation of the actual generated power with respect to the rotation operation with the elevation angle of 0.1 degree is collated with the back data of the elevation angle (correction amount derivation data), it can be determined how many times the elevation angle has deviated. If there is no deviation in tracking, fluctuations in the generated power will be in a very small range. Such a method 2 for determining the correction amount has an advantage that it can be applied to any of the patterns (b), (c), and (d).

<Example of correction result>
FIG. 12 is a diagram illustrating, as an example, a case where the elevation angle is corrected from the state of the pattern (b), for example. The lower graph in the figure partially enlarges the upper graph. Further, similarly to FIG. 8, the position where the condensing spot SP is formed on the power generation element 122 is shown.
Here, when correction is made to add +1.0 degree as an offset value, the elevation angle that was −1.0 degree becomes 0 degree. Thereby, after the correction, the fluctuation pattern due to the deviation of the elevation angle disappears, and the generated power increases.

《Example as a concentrating solar power generation system》
Next, an embodiment of a concentrating solar power generation system (including a description of a tracking deviation detection method or a correction method) viewed from the point of the tracking operation will be described. Note that here, only the “concentrated photovoltaic power generation system viewed from the point of tracking operation” will be described, and therefore the illustration of the original output control unit (for example, MPPT control unit, inverter circuit unit, etc.) as the power generation system Description is omitted.

  FIG. 13 is a diagram illustrating an example of a concentrating solar power generation system viewed from the point of such tracking operation. In the figure, the concentrating solar power generation device 100 includes the driving device 200 for tracking the sun on the back side, for example, as described above. The drive device 200 includes a stepping motor 201e for driving in the elevation direction, a stepping motor 201a for driving in the azimuth direction, and a drive circuit 202 for driving them. The stepping motor is only an example, and other power sources may be used.

  In the concentrating solar power generation apparatus 100, a tracking sensor 4 and a direct solar radiation meter 5 are provided in the vicinity of the empty space of the concentrating solar power generation panel 1 or the like. An output signal (direct solar radiation intensity) of the direct solar radiation meter 5 is input to the drive circuit 202 and the control device 400. The generated power of the concentrating solar power generation panel 1 can be detected by the wattmeter 300, and a signal indicating the detected power is input to the control device 400. The driving device 200 stores the latitude and longitude of the place where the concentrating solar power generation panel 1 is installed, and has a clock function. Based on the output signal of the tracking sensor 4 and the position of the sun calculated from the latitude, longitude, and time, the driving device 200 performs a tracking operation so that the concentrating solar power generation panel 1 always faces the sun. However, as described above, the tracking sensor 4 may not be provided. In that case, the tracking operation is performed based only on the position of the sun calculated from the latitude, longitude, and time.

<Example of correction processing by software>
14 and 15 are flowcharts showing processing related to detection and correction of tracking deviation, which is executed by the control device 400. 14 are connected to A and B in FIG. 15, respectively. Note that the numerical values given in the following flowchart are merely examples, and the present invention is not limited to these.

First, in FIG. 14, with the start of processing, the control device 400 accumulates data at intervals of 5 seconds (step S1). This data includes direct solar radiation intensity, generated power, and time.
Next, the control device 400 determines whether or not a predetermined solar radiation condition is satisfied (step S2). It is determined whether or not both of the predetermined solar radiation conditions satisfy that the direct solar radiation intensity for the past 10 minutes is 600 W / m ² or more and that the fluctuation is within 10%. That is, the two conditions mean that the weather is stable and clear (sunny). If the predetermined condition is not satisfied, the process of the control device 400 returns to the data accumulation (step S1) and waits for the predetermined condition to be satisfied.

  When the predetermined condition is satisfied in step S2, control device 400 checks the fluctuation pattern of the generated power (step S3B). In other words, among the generated power for the past 10 minutes, the difference in the generated power that has been continuously measured becomes a difference of 10% or more of the generated power even after normalization for fluctuations in direct solar radiation intensity (that is, normal) It is not within the range of fluctuation.) Check for fluctuations in generated power.

  If such a step-like variation does not exist (for example, a case like the pattern (a) in FIG. 6), the control device 400 treats the correction as unnecessary and returns the process to step S1. Note that if there is a value of 95% or more of the normal state after normalizing the fluctuation of the direct solar radiation intensity between steps S2 and S3B, it is determined that there is no abnormality and the process proceeds to step S1. It is also possible to insert a step (step S3A (not shown)) to return. Further, in the operation of returning the process to any one of the above-described steps S1, instead of returning the process to step S1, it is possible to temporarily stop this control process with no abnormality, but it is always good. For the purpose of continuing the monitoring work to maintain the state, it is preferable to return the process to step S1.

  Next, among the generated power for the past 10 minutes, the difference in generated power that has been measured continuously has a difference of 10% or more even after normalization for fluctuations in direct solar radiation intensity. Is present, an intermediate point (U_j) between the step variation occurrence period (S_j) and the time is obtained, and the directionality of the variation is further checked (step S3C). That is, the serrated variation pattern included in the variation pattern is either (a) a pattern that gradually increases and decreases when the step changes, or (b) a pattern that gradually decreases and increases when the step changes. Based on this, the sign of the angle to be corrected is known.

For example, among the generated power for the past 10 minutes, the difference in the generated power that has been measured continuously has a difference of 10% or more after the normalization with respect to the fluctuation of the direct solar radiation intensity. the dP1, dP2, ···, and dPn, before and after the time of the corresponding step _{change, T 1A, T 1B, T} 2A, T 2B, ···, T nA, and _{T nB.} Here, an arbitrary integer from 1 to (n−1) is assumed to be m, and the difference between these fluctuation occurrence times is Sm = T _{(m + 1) A} −T _mA . Further, Um = (T _{(m + 1) A} + T _mA ) / 2 is set as an intermediate point of time. Then, as a representative generation cycle (S_j) and the intermediate point (U_j) of the time, it may be selected from the set of Sm and Um. As a method of selecting m, (b) m when dPm is the maximum, (b) m of the latest Um, (c) m when dPm is the center value in the distribution, etc. But you can. (B) is preferable in order to reduce the processing load and reduce the cost of the circuit. Further, the direction of variation is determined from the magnitude relationship between the generated power at T _mA and T _mB .

  Here, in the case where the azimuth angle deviation and the elevation angle deviation are mixed as shown in the pattern (d) of FIG. 6, two types of dPm groups appear, and S_j and U_j corresponding to each of them are represented. It is also possible to ask for it. As a method of processing by software, for example, there is the following method. However, this is only an example, and the numerical value is only an example. For example, a dPm group in which a difference in generated power continuously measured during a certain time is a difference of 10% or more of the generated power, and each difference amount is within ± 10%, and these appear periodically. In other words, dPm sets having similar values are searched, and the period Sm at time Tm corresponding to these dPm is read. Further, the intermediate point Um of the corresponding time is read. Further, the direction of variation is also determined. As a result, for example, the period S_j of the fluctuation caused by the deviation of the azimuth angle and the intermediate point U_j of the time can be obtained, and the directionality of the fluctuation can also be known.

  When there are two types of such dPm groups (that is, when there is another group whose variation range differs from the dPm group by 20% or more), the second type, that is, variation caused by, for example, elevation angle deviation The same processing is performed for. Then, this is determined to be a mixed pattern such as pattern (d). If three types appear, the third type is not processed or the process returns to the start. When there are two types of dPm groups, and two types of S_j and U_j corresponding to each of the groups and the direction of variation are obtained, one of them is selected, and the next step is to correct one of the angle deviations. You can go to the next step.

  Then, in the subsequent step S4, the control device 400 causes the sun to move in the azimuth direction at the intermediate point U_j of the time corresponding to the minimum movement angle by the stepping motor 201a in the azimuth direction at that time. The time S_A required and the time S_E required for the sun to move in the elevation angle at that time corresponding to the minimum movement angle of the stepping motor 201e in the elevation angle direction are designated as the concentrating solar power generation panel 1 and the driving device. It is calculated from the latitude / longitude of 200 installation locations and the time U_j. Note that these times may be detected by a tracking sensor.

Next, the control device 400 determines whether or not the following 1) and 2) are established (step S5).
1) | (S_j−S_E) / S_j | ≦ 30%
2) | (S_j−S_A) / S_j | ≦ 30%
The above 1) is a condition for capturing a state similar to the reaction of generated power when there is a deviation in elevation angle (pattern (b) in FIG. 6). Further, 2) is a condition for capturing a state similar to the reaction of generated power when there is a deviation in azimuth (pattern (c) in FIG. 6).

  If only 1) holds, it can be determined that there is a deviation in elevation angle. If only 2) holds, it can be determined that there is a deviation in azimuth. Further, when both 1) and 2) are satisfied (when the values of S_E and S_A are close to each other depending on the time zone), and when both are not satisfied, the control device 400 determines whether correction is difficult or correction is performed. Treat as unnecessary and return to step S1.

  When only the above 2) is established, the control device 400 proceeds to step S6 in FIG. 15, depending on whether the fluctuation at the step-like fluctuation of the generated power is changing in the increasing direction or the decreasing direction. Determine the direction of correction. When it is changing in the increasing direction, the control device 400 corrects the offset of the azimuth angle to the plus side and corrects the tracking deviation that causes the fluctuation of the generated power (step S7). In the case of fluctuation in the decreasing direction, the control device 400 corrects the offset of the azimuth angle to the negative side and corrects the tracking deviation that causes the fluctuation of the generated power (step S8).

  On the other hand, when only the above 1) is established, the control device 400 proceeds to step S10 in FIG. 15, and whether the fluctuation at the stepped fluctuation of the generated power is changing in the increasing direction or the decreasing direction. Determine. When it is fluctuating in the increasing direction, the control device 400 further determines whether the time is before or after the south / central time (step S11). If the time is before the south-central time, the control device 400 corrects the offset of the elevation angle to the plus side, and corrects the tracking deviation that causes the fluctuation of the generated power (step S12). When the time is later than the south-central time, the control device 400 corrects the offset of the elevation angle to the minus side and corrects the tracking shift that causes the fluctuation of the generated power (step S13).

  In addition, when the fluctuation at the step-like fluctuation of the generated power is fluctuating in step S10, the control device 400 further determines whether it is before or after the south / central time (step S14). If the time is before the south-central time, the control device 400 corrects the offset of the elevation angle to the minus side and corrects the tracking deviation that causes the fluctuation of the generated power (step S15). When the time is later than the south-central time, the control device 400 corrects the offset of the elevation angle to the plus side and corrects the tracking shift that causes the fluctuation of the generated power (step S16). As a method for deriving the correction amount, any one of the methods described in << Method for determining correction amount 1 >> and << Method for determining correction amount 2 >> described above may be used. Alternatively, the correction amount may be set to an appropriate fixed value, and may be converged to a state where there is no deviation while repeating this correction routine.

When any one of the corrections in steps S7, S8, S12, S13, S15, and S16 is completed, the control device 400 resets the accumulated data for the past 10 minutes and finishes a series of processes (step S9), and then again in step S1. Return processing to.
In the above description, the case where only one set of S_j, U_j and variation directionality is handled is described in step S4 and the following steps. However, in step S3C, when a mixed pattern is determined, It is also possible to carry out the processing of step S4 and subsequent steps for the other S_j, U_j, and the direction of the fluctuation, and then return to step S1 before returning to step S1.
By performing the processing shown in FIGS. 14 and 15 periodically (for example, every day), if the concentrating solar power generation device 100 is used in a state where tracking deviation does not always occur, the device 100 is The maximum power obtained in a given environment can be obtained.

<Others>
In the above embodiment, for example, in the vicinity of the solar time in the sun, by comparing the fluctuation pattern that repeatedly occurs with time change of the generated power with the form peculiar to the azimuth shift and the form peculiar to the elevation shift, It has been shown that the presence or absence of tracking deviation can be detected, but depending on the time, the form peculiar to azimuth deviation and the form peculiar to elevation deviation also change. Detection and correction are necessary in consideration of the above.

Moreover, FIG. 16 is a figure which shows the other example of the concentrating solar power generation system seen from the point of the tracking operation | movement. The difference from FIG. 13 is that the communication device 500 is provided at the site where the concentrating solar power generation device 100 is installed, and the control device 400 is installed at a remote location via a communication line such as the Internet. The communication device 500 transmits a measurement signal of the wattmeter 300 to the control device 400 and receives a correction signal for the drive device 200 from the control device 400.
In this case, since tracking deviation can be corrected by remote control via a communication line, the configuration is suitable for centralized management from a distance.

FIG. 17 is a diagram illustrating still another example of the concentrating solar power generation system. A difference from FIG. 13 is that a direct solar radiation meter 5A is used in place of the direct solar radiation meter 5 (FIG. 13).
For example, there are a horizontal solar radiation meter and a normal surface global solar radiation meter. The horizontal solar radiation meter is not installed integrally with the concentrating solar power generation panel 1, but is fixedly installed near the concentrating solar power generation panel 1, for example. The horizontal solar radiation meter does not track the sun. On the other hand, the normal surface solar radiation meter measures the total sky light (direct light and scattered light) received on the normal surface and, like the concentrating solar power generation panel 1, performs the tracking operation of the sun. To do. The normal surface solar radiation meter is installed on the concentrating solar power generation panel 1 and performs tracking operation together, or is installed in the vicinity of the concentrating solar power generation panel 1 and independently performs tracking operation. .

  The processing in step S2 of FIG. 14 when the global solar radiation meter 5A is used is, in the case of a normal global solar radiation meter, the normal global solar radiation intensity detected by the normal global solar radiation meter is predetermined. If the value is greater than or equal to the value, a predetermined solar radiation condition is satisfied. Further, in the case of a horizontal solar radiation meter, a predetermined solar radiation condition is satisfied when the horizontal solar radiation intensity detected by the horizontal solar radiation meter is equal to or greater than a predetermined value. Only when the solar radiation conditions are satisfied, tracking deviation is detected and corrected.

  In the above-mentioned normal surface horizontal solar radiation meter or horizontal flat surface solar radiation meter, it is less susceptible to contamination of the window portion of the built-in solar radiation sensor as compared to the direct solar radiation meter. In addition, the direct solar radiation meter has few problems of tracking deviation that cause measurement errors. Therefore, more accurate information may be obtained regarding actual measurement of sunlight intensity.

  The control device 400 (FIGS. 13, 16, and 17) may include a computer and software, or may be configured mainly by hardware. In the case of software, the program can be recorded on a computer-readable recording medium (for example, an optical disk, a magnetic disk, a compact memory, etc.).

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Concentration type photovoltaic power generation panel 1M Concentration type photovoltaic power generation module 3 Base 3a Prop 3b Foundation 4 Tracking sensor 5 Direct solar radiation meter 5A Global solar radiation meter 11 Case 11a Bottom surface 11b Ridge part 12 Flexible printed wiring board 13 Primary Condensing unit 13f Fresnel lens 14 Connector 100 Concentrating solar power generation device 121 Flexible substrate 122 Power generation element 123 Secondary condensing unit 200 Driving device 201a Stepping motor 201e Stepping motor 202 Driving circuit 300 Wattmeter 400 Control device 500 Communication device SP Focus spot

Claims (12)

A concentrating solar power generation panel;
A driving device for causing the concentrating solar power generation panel to perform a tracking operation with respect to the sun;
When a predetermined solar radiation condition for the concentrating solar power generation panel is satisfied, a variation pattern that repeatedly occurs with time change of the generated power in the concentrating solar power generation panel is detected, and the detected variation pattern is A concentrating solar power generation system comprising: a control device that detects the presence or absence of tracking deviation by comparing with a form peculiar to angular deviation and a form peculiar to elevation deviation.   The control device, when there is a tracking shift, specifies an axis that generates a shift out of two axes of an azimuth angle and an elevation angle, and instructs the drive device to correct the angle on the specified axis. Item 4. A concentrating solar power generation system according to item 1. The control device has a sawtooth variation pattern included in the variation pattern,
(A) A pattern that gradually increases and decreases when the step changes, and
3. The concentrating solar power generation system according to claim 2, wherein the sign of the angle to be corrected is determined based on whether the pattern is a pattern that gradually decreases and increases when the step changes.   The condensing device according to claim 2 or 3, wherein the control device determines an absolute value of an angle to be corrected based on the generated power that is stored in advance and that is reduced as viewed from the generated power when there is no deviation. Type solar power generation system.   The concentrating photovoltaic power generation system according to claim 2 or 3, wherein the control device determines an absolute value of an angle to be corrected based on a change ratio of generated power with respect to a tracking operation. The concentrating solar power generation panel has a direct solar radiation meter,
The concentrating sunlight according to any one of claims 2 to 5, wherein the control device performs the correction only when a direct solar radiation intensity detected by the direct solar radiation meter is equal to or greater than a predetermined value. Power generation system.   The concentrating solar power generation system according to any one of claims 2 to 6, wherein the control device performs the correction during a time zone in which the sun goes south. As a total solar radiation meter, a normal surface horizontal solar radiation meter or a horizontal horizontal solar radiation meter is provided,
In the case of a normal surface solar radiation meter, if the normal surface global solar radiation intensity detected by the normal surface solar radiation meter is greater than or equal to a predetermined value, The concentrating solar power generation system according to any one of claims 2 to 5, wherein the correction is performed only when the horizontal solar radiation intensity detected by the pyranometer is equal to or greater than a predetermined value. A communication device that transmits a measurement signal of a power meter that measures the generated power and receives a correction signal to the drive device;
The control device is installed at a location away from the concentrating solar power generation panel and the driving device, and communicates with the communication device via a communication line, thereby receiving the measurement signal and the correction signal. The concentrating solar power generation system according to any one of claims 2 to 8, wherein the transmission is performed. A method for detecting a tracking shift in a concentrating solar power generation device including a driving device that causes the concentrating solar power generation panel to perform a sun tracking operation,
When a predetermined solar radiation condition for the concentrating solar power generation panel is satisfied, a variation pattern included in the temporal change of the generated power of the concentrating solar power generation panel is detected,
Detecting the presence or absence of tracking deviation by comparing the detected variation pattern with a form peculiar to a deviation in azimuth and a form peculiar to a deviation in elevation angle;
Tracking error detection method. In the concentrating solar power generation apparatus provided with a driving device that causes the concentrating solar power generation panel to perform the tracking operation of the sun, control for detecting the generated power of the concentrating solar power generation panel and controlling the driving apparatus A tracking deviation correction method executed by an apparatus,
When a predetermined solar radiation condition for the concentrating solar power generation panel is satisfied, a variation pattern included in the temporal change of the generated power of the concentrating solar power generation panel is detected,
By comparing the detected variation pattern with a form peculiar to a deviation of azimuth and a form peculiar to a deviation of elevation angle, the presence or absence of tracking deviation is detected,
If there is a misalignment, specify the axis that is misaligned from the two axes of azimuth and elevation,
Directing the drive to correct the angle in the identified axis;
Tracking error correction method.   In advance, by measuring the change over time of the generated power with one of the azimuth angle and the elevation angle fixed, the deviation of the other angle corresponding to the generated power reduced from the generated power when there is no deviation is checked. The tracking shift correction method according to claim 11.