JP5879079B2 - Solar power plant - Google Patents

Description

  The present invention relates to a solar power generation device.

  Generally, it is known that a solar power generation device is composed of a large number of solar cells. Moreover, the abnormality detection apparatus which detects abnormality of a solar cell is disclosed (for example, refer patent document 1).

JP 07-334767 A

  However, when an abnormality occurs in some of the solar cells of the solar power generation apparatus configured with a large number of solar cells, it takes a great effort to identify the solar cell in which the abnormality has occurred. Moreover, when attaching an abnormality detection apparatus to a solar cell, the number of abnormality detection apparatuses proportional to the number of solar cells are needed. Therefore, when the abnormality detection device is attached to a large-scale solar power generation device, the introduction cost such as the cost for the abnormality detection device or the labor cost for the installation work increases.

  Then, the objective of this invention is providing the solar power generation device which can reduce the operation | work which specifies the solar cell which abnormality generate | occur | produced from the some solar cell, and can suppress introduction cost.

A photovoltaic power generation apparatus according to an aspect of the present invention includes a plurality of photovoltaic power generation means connected in parallel and having different output currents for the same illuminance and the same voltage, and electricity generated by the plurality of photovoltaic power generation means. Power storage means for storing the electrical energy, electrical quantity measuring means for measuring the total current output from the plurality of solar power generation means to the electrical storage means as an electrical quantity, and the electrical quantity measured by the electrical quantity measuring means And an abnormality detection unit that identifies the abnormal solar power generation unit among the plurality of solar power generation units based on a difference from the amount of electricity, and detects an abnormality.

  ADVANTAGE OF THE INVENTION According to this invention, the operation | work which specifies the solar cell in which abnormality generate | occur | produced from the some solar cell can be reduced, and the solar power generation device which can suppress introduction cost can be provided.

The block diagram which shows the structure of the solar power generation device which concerns on the 1st Embodiment of this invention. The block diagram which shows the structure of the electrical storage device which concerns on 1st Embodiment. The block diagram which shows the structure of the solar power generation device which concerns on the 2nd Embodiment of this invention. The block diagram which shows the structure of the electrical storage device which concerns on 2nd Embodiment. The block diagram which shows the structure of the solar power generation device which concerns on the 3rd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a configuration diagram showing a configuration of a photovoltaic power generation apparatus 10 according to the first embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part in subsequent figures, the detailed description is abbreviate | omitted, and a different part is mainly described. In the following embodiments, the same description is omitted.

  The solar power generation device 10 includes j (j> 2) solar panel groups G1, G2,..., Gj from the first group to the jth group, and the battery 1. The battery 1 is installed in the building 9 (indoor). The solar panel groups G1 to Gj are installed outdoors.

  All the solar panel groups G1 to Gj are connected in parallel. The solar panel groups G1 to Gj connected in parallel are connected to the input terminal of the battery 1 through current collecting cables L1P and L1N. Thereby, all the solar panel groups G1-Gj are connected so that the electric power generated may be charged in the battery 1.

  Each solar panel group G1 to Gj includes a plurality of solar panels (such as solar cells or photovoltaic elements) P11 to Pjm connected in series and terminals TR1 to TRj. It is assumed that all the solar panels P11 to Pjm constituting the solar power generation device 10 have the same performance.

  The number of solar panels P11 to Pjm constituting each solar panel group G1 to Gj is configured to be different from each other. The first group of solar panels G1 includes n solar panels P11 to P1n. The second group of solar panels G2 includes k solar panels P21 to P2k. The jth solar panel group Gm includes m solar panels Pj1 to Pjm.

  In each solar panel group G1 to Gj, the solar panels P11 to P1n, P21 to P2k, and Pj1 to Pjm connected in series are connected to terminals TR1 to TRj, respectively. The solar panel groups G1 to Gj output the generated power from the terminals TR1 to TRj to the battery 1.

  With reference to FIG. 2, the structure of the battery 1 will be described. In addition, illustration and description are abbreviate | omitted about the structure of the electrical storage part which stores the electricity of the electrical storage device 1, and its control.

  The battery 1 includes a voltmeter 11 and an abnormality diagnosis circuit 12. In addition, the battery 1 has an internal resistance Rb.

  The voltmeter 11 measures the voltage Vb applied to the input terminal of the battery 1. The voltage Vb measured by the voltmeter 11 is the product of the current Ib flowing into the battery 1 and the internal resistance Rb. The voltmeter 11 outputs the measured voltage Vb to the abnormality diagnosis circuit 12.

  The abnormality diagnosis circuit 12 diagnoses whether there is an abnormal solar panel group G1 to Gj based on the voltage Vb measured by the voltmeter 11. The abnormal solar panel groups G1 to Gj are solar panel groups G1 to Gj including the solar panels P11 to Pjm in which an abnormality has occurred. The abnormality diagnosis circuit 12 outputs an abnormality signal SN including information for identifying the solar panel groups G1 to Gj detected as abnormal when the abnormal solar panel groups G1 to Gj are detected.

  Next, a method of detecting the abnormal solar panel groups G1 to Gj will be described. Here, it is assumed that sunlight is uniformly irradiated to all the solar panel groups G1 to Gj.

  Since all the solar panels P11 to Pjm have the same performance, the solar panel groups G1 to Gj generate electric power proportional to the number of the respective solar panels P11 to Pjm. Moreover, each solar panel group G1-Gj is comprised so that all the numbers of each solar panel P11-Pjm may differ. Therefore, all the electric power generated by each solar panel group G1 to Gj is different.

  Moreover, since all the solar panel groups G1-Gj are connected in parallel, all the voltages Vb output from each solar panel group G1-Gj are the same. Therefore, when sunlight is uniformly irradiated to all the solar panel groups G1 to Gj, the current amounts I1, I2,..., Ij output from the solar panel groups G1 to Gj are all different. A current Ib that is the sum of the currents I1 to Ij output from the solar panel groups G1 to Gj flows into the battery 1.

  Here, the most frequent example in which the solar panels P11 to Pjm become abnormal is disconnection.

  In each solar panel group G1-Gj, the solar panels P11-Pjm are connected in series. Therefore, in each solar panel group G1-Gj, if even one of the configured solar panels P11-Pjm is disconnected, the output current of the solar panel groups G1-Gj including the solar panels P11-Pjm I1 to Ij are zero. When the output currents I1 to Ij of the abnormal solar panel groups G1 to Gj become zero, the current Ib flowing into the battery 1 is reduced by that much.

  When all the solar panel groups G1 to Gj are normal, the following formula is established. Here, I1 to Ij represent currents output when the solar panel groups G1 to Gj are normal.

Vb = (I1 + I2 +... + Ij) × Rb
Moreover, when each solar panel group G1-Gj becomes abnormal, following Formula is formed.

When the first solar panel group G1 is abnormal: Vb = (I2 +... + Ij) × Rb
When the second group of solar panel groups G2 is abnormal: Vb = (I1 + I3 +... + Ij) × Rb
When the solar panel group Gj of the j-th group is abnormal: Vb = (I1 +... + I (j−1)) × Rb
Thus, the voltages Vb measured by the voltmeter 11 when the solar panel groups G1 to Gj become abnormal are all different. The battery 1 stores in advance the respective voltages Vb estimated when the solar panel groups G1 to Gj are normal and when each of the solar panel groups G1 to Gj is abnormal. The battery 1 detects the abnormal solar panel groups G1 to Gj based on the voltage Vb estimated in each case of normal or abnormal.

  For example, if the voltage Vb measured by the voltmeter 11 is equal to or higher than a predetermined voltage, the battery 1 determines that there are no abnormal solar panel groups G1 to Gj. Here, the predetermined voltage is a minimum voltage value estimated to be applied to the battery 1 when the solar panel groups G1 to Gj are normal.

  When the voltage Vb measured by the voltmeter 11 is less than the predetermined voltage indicating that the voltage is normal, the battery 1 identifies the abnormal solar panel groups P11 to Pjm as follows.

  If the voltage Vb measured by the voltmeter 11 is within a predetermined voltage range centered on a voltage estimated when a certain solar panel group is abnormal, the battery 1 indicates that the solar panel group is abnormal. Judged to be a certain solar panel group.

  According to this embodiment, in the solar power generation device 10 provided with a large number of solar panels P11 to Pjm, the output currents I1 to Ij when the solar panel groups G1 to Gj are irradiated with uniform sunlight. By configuring so that all are different, it is possible to detect an abnormal solar panel group. Thereby, the operation | work for pinpointing the solar panels P11-Pjm with abnormality can be reduced.

  Moreover, since it is not necessary to provide the apparatus for detecting abnormality in each of the solar panels P11-Pjm, the introduction cost of the solar power generation device 10 can be reduced.

  Furthermore, the abnormal solar panel groups G1 to Gj can be identified by the building 9 in which the battery 1 is installed. Thus, by identifying the abnormal solar panel groups G1 to Gj from a remote location, it is possible to facilitate work such as repair of the abnormal solar panels P11 to Pjm.

(Second Embodiment)
FIG. 3 is a configuration diagram showing a configuration of a photovoltaic power generation apparatus 10A according to the second embodiment of the present invention.

  The solar power generation device 10A is the solar power generation device 10 according to the first embodiment shown in FIG. 1, in which the storage battery 1 is replaced with the storage battery 1A, and the storage battery 1A and each of the solar panel groups G1 to Gj are respectively temperature measuring cables. Lg1, Lg2,..., Lgj are connected. Others are the same as that of the solar power generation device 10 according to the first embodiment.

  The temperature measuring cables Lg1, Lg2,..., Lgj are made of a material having a thermal electromotive force coefficient different from that of the current collecting cables L1P, L1N.

  FIG. 4 is a configuration diagram showing the configuration of the battery 1A according to the present embodiment.

  In the battery 1 according to the first embodiment shown in FIG. 2, the battery 1 </ b> A replaces the abnormality diagnosis circuit 12 with the abnormality diagnosis circuit 12 </ b> A, and the same number of first temperatures as the reference temperature storage unit 13 and the solar panel groups G <b> 1 to Gj. In this configuration, j temperature detectors 141, 142,..., 14j from the group to the j-th group are added. Others are the same as those of the battery 1 according to the first embodiment.

  A positive current collector cable L1P (or a negative current collector cable L1N) and a corresponding group of temperature measuring cables Lg1 to Lgj are connected to the temperature detectors 141 to 14j of each group. The temperature detectors 141 to 14j detect temperature differences T1, T2,..., Tj between the representative locations of the building 9 and the solar panel groups G1 to Gj by using the current collecting cable L1P and the temperature measuring cables Lg1 to Lgj. . The temperature detectors 141 to 14j transmit the detected temperature differences T1 to Tj to the abnormality diagnosis circuit 12A.

  Here, a method for detecting the temperature differences T1 to Tj by the temperature detectors 141 to 14j of each group will be described.

  The temperature measuring cables Lg <b> 1 to Lgj and the current collecting cable L <b> 1 </ b> P have different thermoelectromotive force coefficients. Further, one ends of the temperature measuring cables Lg1 to Lgj and the current collecting cable L1P are located outdoors where the solar panel groups G1 to Gj are installed. The other end is in the building 9 where the battery 1A is installed. Therefore, an electromotive voltage is generated between the temperature measuring cables Lg1 to Lgj and the current collecting cable L1P according to the temperature difference between the representative portion of each solar panel group G1 to Gj and the indoor. That is, the temperature measuring cables Lg1 to Lgj and the current collecting cable L1P are thermocouples. The temperature detectors 141 to 14j of each group can measure the temperature differences T1 to Tj between the representative location of each solar panel group G1 to Gj and the indoor by measuring this electromotive voltage.

  The temperature differences T1 to Tj between the installation locations of the solar panel groups G1 to Gj and the indoors are proportional to the illuminance of the sunlight irradiated to the solar panel groups G1 to Gj. Here, the indoor temperature is estimated to be a temperature in a state where no sunlight is irradiated. Therefore, the generated power of each solar panel group G1-Gj can be estimated by grasping these temperature differences T1-Tj.

  Next, a method for calculating the temperature difference T1 by the first group temperature detector 141 will be described. Similarly, the temperature detectors 142 to 14j of other groups calculate the temperature differences T2 to Tj.

  The thermal electromotive force coefficient of the current collecting cable L1P is “C”, the thermal electromotive force coefficient of the first temperature measuring cable Lg1 is “K”, the indoor temperature is “T”, and the solar panel group G1 of the first group When the temperature is “T1a”, the following equation is established.

Thermoelectromotive force of current collecting cable L1P = C × (T−T1a)
Thermoelectromotive force of temperature measuring cable Lg1 = K × (T−T1a)
From the above two formulas, the potential E1 between the current collecting cable L1P and the temperature measuring cable Lg1 in the battery 1A is expressed by the following formula.

E1 = C × (T−T1a) −K × (T−T1a)
= T1 × (C−K)
T1 = E1 / (C−K)
Thus, the 1st group temperature detection part 141 calculates the temperature difference T1 with the temperature of indoor and the 1st group solar panel group G1.

  The reference temperature storage unit 13 stores in advance a reference temperature Tr serving as a reference when detecting abnormalities in the solar panel groups G1 to Gj. For example, the reference temperature is a temperature difference between the indoor and the solar panel groups G1 to Gj when the solar panel groups G1 to Gj are normally irradiated with sunlight. The reference temperature storage unit 13 transmits the stored reference temperature Tr to the abnormality diagnosis circuit 12A.

  The abnormality diagnosis circuit 12A includes a voltage Vb measured by the voltmeter 11, a reference temperature Tr stored in the reference temperature storage unit 13, and a temperature difference of each group detected by the temperature detection units 141 to 14j of each group. T1 to Tj are input. The abnormality diagnosis circuit 12A detects the solar panel groups G1 to Gj having an abnormality based on the measured voltage Vb, the reference temperature Tr, and the temperature differences T1 to Tj of each group.

  When the temperature differences T1 to Tj of all the groups are within the allowable range of the reference temperature Tr, the abnormality diagnosis circuit 12A detects the solar panel groups G1 to Gj having an abnormality as in the first embodiment.

  When the temperature differences T1 to Tj of each group are all within the range of the reference temperature Tr, each of the solar panel groups G1 to Gj assumed to detect the abnormal solar panel groups G1 to Gj. This is a case where the generated power of each of the solar panel groups G1 to Gj estimated by the temperature differences T1 to Tj of each group is within the allowable range of the generated power.

  Next, a case where the temperature differences T1 to Tj of at least one group are not within the allowable range of the reference temperature Tr will be described.

  The abnormality diagnosis circuit 12A corrects the output currents I1 to Ij estimated by the corresponding solar panel groups G1 to Gj based on the temperature differences T1 to Tj of the groups not within the allowable range. The abnormality diagnosis circuit 12A calculates the sum total of the estimated output currents I1 to Ij of the solar panel groups G1 to Gj after correction by the temperature differences T1 to Tj of the groups that are not within the allowable range.

  The abnormality diagnosis circuit 12A determines whether the solar panel groups G1 to Gj are normal and the solar panel groups G1 based on the estimated output currents I1 to Ij of the solar panel groups G1 to Gj after correction and the sum thereof. Each voltage Vb estimated when each of .about.Gj is abnormal is calculated.

  The abnormality diagnosis circuit 12A detects the solar panel groups G1 to Gj having an abnormality based on the voltage Vb estimated in each case, as in the first embodiment.

  According to the present embodiment, in addition to the operational effects of the first embodiment, the following operational effects can be obtained.

  10A of solar power generation devices estimate the illumination intensity of the sunlight irradiated to each solar panel group G1-Gj by measuring temperature difference T1-Tj between indoor and each solar panel group G1-Gj, The generated power and output currents I1 to Ij of each solar panel group G1 to Gj can be estimated. Therefore, the solar power generation device 10 </ b> A can detect the abnormal solar panel groups G <b> 1 to Gj in response to changes in the illuminance of the sunlight irradiated to the solar panel groups G <b> 1 to Gj. Thereby, 10 A of solar power generation devices can improve the precision which detects abnormality.

(Third embodiment)
FIG. 5 is a configuration diagram showing a configuration of a photovoltaic power generation apparatus 10B according to the third embodiment of the present invention.

  The solar power generation device 10B is the same as the solar power generation device 10 according to the first embodiment shown in FIG. 1 except that the abnormal signal generator 2 is added to the solar panel groups G1 to Gj, respectively. , LDj is added. Others are the same as that of the solar power generation device 10 according to the first embodiment.

  The abnormal signal generator 2 is installed in the building 9. Abnormal signal generator 2 is connected to capacitor 1 by wiring so as to receive abnormal signal SN. The abnormality signal generator 2 is connected to the current collecting cables L1P and L1N via abnormality display signal output lines L2P and L2N. When the abnormal signal generator 2 receives the abnormal signal SN from the battery 1, the alternating current of the frequency for lighting the abnormal indicators LD1 to LDj provided in the solar panel groups G1 to Gj having the abnormality indicated by the abnormal signal SN. Output voltage. The AC voltage for lighting the abnormality indicators LD1 to LDj output from the abnormality signal generator 2 is applied to the current collecting cables L1P and L1N via the abnormality display signal output lines L2P and L2N.

  Each of the abnormality indicators LD1 to LDj is lit with an AC voltage having a specific frequency. The abnormality indicators LD1 to LDj are all set to light up with alternating voltages having different frequencies. The abnormality indicators LD1 to LDj receive the AC voltage output from the abnormality signal generator 2 superimposed on the current collecting cables L1P and L1N. The abnormality indicators LD1 to LDj measure the frequency of the AC voltage received by the frequency measurement circuit. The abnormality indicators LD1 to LDj are turned on when the measured frequency is its own frequency.

  According to the present embodiment, in addition to the operational effects of the first embodiment, the following operational effects can be obtained.

  The solar power generation device 10 </ b> B is provided with the abnormal signal generator 2 so that the abnormal solar panel groups G <b> 1 to Gj specified by the capacitor 1 are provided at the place where the solar panel groups G <b> 1 to Gj are installed. Can be displayed on the displayed abnormality indicators LD1 to LDj. Thereby, the worker etc. who repair solar panel P11-Pjm can confirm the solar panel group G1-Gj which has abnormality on the spot. Thereby, the worker or the like can efficiently repair the solar panels P11 to Pjm.

  In each embodiment, all the solar panel groups G1 to Gj are configured to have different output currents I1 to Ij (or output power), but at least two solar panel groups are configured to have different output currents. If so, there may be a group of solar panels with the same output current. If the output currents of at least two solar panel groups are different, it is possible to determine that a solar panel group having an output current different from the output current of the abnormal solar panel group is not abnormal.

  Moreover, although each solar panel P11-Pjm was demonstrated as the same performance in each embodiment, the solar panels P11-Pjm of a different performance may be mixed. As long as the output currents of at least two solar panel groups G1 to Gj are different, the performance of the solar panels P11 to Pjm in each of the solar panel groups G1 to Gj may be configured in any way. . For example, each solar panel group G1 to Gj may be composed of one solar panel having a different output current.

  Furthermore, in each embodiment, the output currents I1 to Ij of the solar panel groups G1 to Gj may be configured to be different. For example, the output currents I1 to Ij of the solar panel groups G1 to Gj may be determined in consideration of the resolution for detecting an abnormality.

  In each embodiment, abnormal solar panel groups G1 to Gj are detected based on the voltage Vb measured by the voltmeter 11, but abnormal solar light is detected based on the current Ib flowing through the battery 1. Panel groups G1 to Gj may be detected. In this case, the current Ib estimated when the solar panel groups G1 to Gj are normal and when each of the solar panel groups G1 to Gj is abnormal is stored in the battery 1 in advance, so that the voltage Vb and Similarly, abnormal solar panel groups G1 to Gj can be detected.

  Furthermore, in 2nd Embodiment, although temperature difference T1-Tj of each group was used in order to correct | amend the output currents I1-Ij of each estimated solar panel group G1-Gj, it is not restricted to this.

  For example, when there is a temperature difference T1 to Tj of a group that is not within the allowable range, the solar panel group of that group is excluded from the abnormality detection target, and the abnormal solar panel group is detected from the other solar panel groups. You may do it. Further, if there is at least one temperature difference T1 to Tj of the group not within the allowable range, the abnormality diagnosis circuit 12A does not detect the abnormal solar panel group, and all the temperature differences T1 to Tj are within the allowable range. It is good also as detecting a solar panel group with abnormality. Thereby, when sunlight is not irradiated to some solar panel groups G1-Gj or when sunlight is not irradiated to all the solar panel groups G1-Gj like nighttime, sunlight It is possible to prevent erroneous detection of abnormalities in the panel groups G1 to Gj.

  Moreover, although 2nd Embodiment and 3rd Embodiment were demonstrated separately, it is good also as a structure which combined these. According to such an embodiment, the respective operational effects of the second embodiment and the third embodiment can be obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 ... Power storage device, 9 ... Building, 10 ... Solar power generation device, G1-Gj ... Solar panel group, L1P, L1N ... Current collecting cable, P11-Pjm ... Solar panel, TR1-TRj ... Terminal.

Claims (8)

A plurality of solar power generation means connected in parallel and having different output currents for the same illuminance and the same voltage ;
Power storage means for storing electricity generated by the plurality of solar power generation means;
An electric quantity measuring means for measuring the total current output from the plurality of solar power generation means to the power storage means as an electric quantity;
Based on the difference between the quantity of electricity measured by the quantity of electricity measuring means and a predetermined quantity of electricity, the abnormal photovoltaic power generation means is identified among the plurality of photovoltaic power generation means, and an abnormality is detected. An anomaly detecting means for performing the solar power generation apparatus. The solar power generation apparatus according to claim 1, wherein the solar power generation means is a plurality of solar cells connected in series. A plurality of temperature difference detecting means for detecting a temperature difference between a place where the plurality of photovoltaic power generation means are installed and a place where sunlight is not irradiated, respectively;
The abnormality detection means is based on the temperature difference detected by the plurality of temperature difference detection means,
The photovoltaic power generation apparatus according to claim 1 or 2, wherein the predetermined amount of electricity is corrected. A plurality of temperature difference detecting means for detecting a temperature difference between a place where the plurality of photovoltaic power generation means are installed and a place where sunlight is not irradiated, respectively;
The abnormality detection means does not detect the abnormal solar power generation means when at least one temperature of the temperature differences detected by the plurality of temperature difference detection means is not within a predetermined allowable range. The solar power generation device according to claim 1 or 2, characterized by the above. The plurality of temperature difference detecting means includes
A plurality of temperature detection lines each extending indoors from the installation location of the plurality of solar power generation means,
5. The temperature difference is detected by using a wiring connecting the plurality of photovoltaic power generation means and the power storage means and the plurality of temperature detection lines as a thermocouple. 6. Solar power generator. A plurality of abnormality display means for displaying an abnormality provided in each of the plurality of solar power generation means;
The abnormality display command means for causing the abnormality display means provided in the solar power generation means having an abnormality detected by the abnormality detection means to display an abnormality is provided. Item 6. The solar power generation device according to any one of Items 5. The abnormality display command means applies an AC voltage having a frequency indicating the solar power generation means having an abnormality to a wiring connecting the plurality of solar power generation means and the power storage means, so that the abnormality display has an abnormality. The solar power generation device according to claim 6, wherein a display indicating abnormality is made on the means. An anomaly detection method for detecting an anomaly of the solar cell of a solar power generation device including a capacitor that stores electricity generated from a plurality of solar cells connected in parallel,
The plurality of solar cells are configured to have different output currents for the same illuminance and the same voltage ,
Measure the total current output from the plurality of solar cells to the battery as an electrical quantity,
Solar light characterized by identifying an abnormal solar cell among the plurality of solar cells based on a difference between a measured amount of electricity and a predetermined amount of electricity, and detecting the abnormality Abnormality detection method for power generation equipment.

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