A high-efficiency double-sided solar photovoltaic module detection device and detection method

Abstract

The present invention discloses a high-efficiency double-sided solar photovoltaic module detection device and detection method, comprising: a support frame, the support frame comprises a left frame and a right frame; an upper support rod, the two ends of which are respectively connected to the left frame and the right frame; a lower support rod, which is located below the upper support rod and parallel to the upper support rod, and the two ends are respectively connected to the left frame and the right frame; a sliding positioning mechanism, which is used to fix the photovoltaic module between the upper support rod and the lower support rod, and can make the photovoltaic module move along the axial direction of the upper support rod and the lower support rod. The present invention can accurately carry out the detection work of the high-efficiency double-sided solar photovoltaic module. After a large number of uses and verifications, the present invention can effectively ensure the accuracy of the detection of the high-efficiency double-sided solar photovoltaic module.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a high-efficiency double-sided solar photovoltaic assembly detection device and a detection method. Background Art

[0002] A bifacial solar cell module is a type of solar cell module that can convert light energy into electrical energy on both the front and back sides. When sunlight shines on a bifacial module, part of the light will be reflected by the surrounding environment to the back of the bifacial module. This part of light is absorbed by the cell, which contributes to the photocurrent and efficiency of the cell, thereby further improving the power generation gain of the module.

[0003] At present, with the increase of bifacial solar cell modules on the market, and most of them are N-type modules or P-type high-efficiency modules, the limitations of the testing methods make it difficult to accurately test the performance of solar cell modules, making it difficult for users to make correct evaluations. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a high-efficiency double-sided solar photovoltaic module detection device to accurately test the performance of the solar photovoltaic module.

[0005] The technical solution of the present invention is: a high-efficiency double-sided solar photovoltaic module detection device, comprising:

[0006] A supporting frame, the supporting frame comprising a left frame and a right frame;

[0007] An upper support rod, with two ends respectively connected to the left frame and the right frame;

[0008] The lower support rod is located below the upper support rod and is parallel to the upper support rod, and its two ends are respectively connected to the left frame and the right frame;

[0009] The sliding positioning mechanism is used to fix the photovoltaic assembly between the upper support rod and the lower support rod, and can make the photovoltaic assembly move along the axial direction of the upper support rod and the lower support rod.

[0010] When installing the photovoltaic assembly in the present invention, the two sides of the photovoltaic assembly are connected to the upper support rod and the lower support rod respectively through the sliding positioning mechanism, so that the photovoltaic assembly is installed between the upper support rod and the lower support rod. In the present invention, the photovoltaic assembly can also be moved along the axial direction of the upper support rod and the lower support rod. There are various structural forms of the sliding positioning mechanism in the present invention, which can be realized by adopting various existing conventional structures. For example, the sliding positioning mechanism can include multiple sliding connectors, and the sliding connector includes a connecting part that is detachably connected to the photovoltaic assembly and a sliding part that is slidably inserted on the support rod (upper support rod or lower support rod). There are various ways to detachably connect with the photovoltaic assembly, which can be adopted by various existing conventional methods, for example, a snap-on method can be adopted.

[0011] Preferably, the support frame further comprises an upper frame and a lower frame, the upper frame is provided with a standard battery movable in the X direction and / or the Y direction, and the lower frame is provided with a monitoring battery. In the present invention, the standard battery can also be moved in the X direction and the Y direction according to the test needs, and there are many ways to achieve the movement of the standard battery in the X direction and the Y direction, for example, a slider and a slide rail can be used, and when the position of the standard battery needs to be adjusted, the slider connected to the standard battery can be moved along the slide rail.

[0012] Preferably, it also includes an infrared probe for monitoring the temperature of the photovoltaic assembly, and the infrared probe is arranged on the upper support rod.

[0013] Preferably, the left frame includes a left slide rail, the right frame includes a right slide rail, and the two ends of the upper support rod are connected to the left slide rail and the right slide rail, respectively, and can slide relative to the left slide rail and the right slide rail. In the present invention, the size of the area between the upper support rod and the lower support rod can also be adjusted, and the upper support rod can be driven to move upward or downward along the left slide rail and the right slide rail. After reaching the required width, the connection end of the upper support rod with the left slide rail and the right slide rail is locked to prevent the upper support rod from continuing to move along the left slide rail and the right slide rail. In the present invention, when the upper support rod is connected to the left slide rail and the right slide rail, sliders can be respectively set at the two ends of the upper support rod, and then the sliders at the two ends are respectively connected to the left slide rail and the right slide rail. When the upper support rod does not need to be moved, the slider can be locked by a locking member to prevent movement. In the present invention, a pulley assembly can also be set to be connected with the slider to achieve balance control of the upper support rod.

[0014] The present invention also provides a detection method using the above-mentioned high-efficiency double-sided solar photovoltaic module detection device, comprising:

[0015] The spectral radiation non-uniformity test is carried out on the detection area of ​​the detection device, the average value of all points is calculated, the standard battery is positioned at the average spectral radiation point, and correction is performed according to formula (1):

[0016] I CF =I P-WPVS / I P-AVE *I (1);

[0018] Among them, I CF is the corrected current, I P-WPVS is the wpvs operating point current, I P-AVE is the average current of all points in the detection area, I is the current;

[0019] The temperature of the photovoltaic module is collected by an infrared probe, and then the temperature coefficient of the IV characteristic is corrected according to formulas (2) and (3):

[0020] I2=I1+I sc [G2 / G1-1]+α(T2-T1) (2);

[0022] V2=V1-R S (I2-I1)-KI2(T2-T1)+β(T2-T1) (3);

[0024] in,

[0025] I1, V1—coordinates of measured characteristic points;

[0026] I2, V2—coordinates of the points corresponding to the correction characteristics;

[0027] I sc —Measured short-circuit current value of the sample;

[0028] G1—Measured irradiance of standard solar cells;

[0029] G2—standard irradiance of standard solar cells;

[0030] T1—measured temperature of the sample;

[0031] T2—standard temperature, or other desired temperature;

[0032] α and β—the temperature coefficients of current and voltage of the specimen under standard or other desired irradiance and over the temperature range of interest (α is positive and β is negative);

[0033] R s —Internal series resistance of the specimen;

[0034] K—curve correction coefficient.

[0035] Scan the IV characteristics of the photovoltaic module once in the forward and reverse directions, and calculate the number of divisions required according to formula (4) to eliminate the capacitance effect:

[0036] (P backward -P forward ) / (P backward +P forwa rd )*100%<0.5% (4);

[0038] Among them, Pbackward: reverse power; Pforward: forward power

[0039] Eliminate reflection and transmission according to formula (5):

[0040]

[0041] in,

[0042] Isc,rear: reverse short-circuit current;

[0043] T(λ): transmittance distribution;

[0044] R(λ): reflectivity distribution;

[0045] S rear (λ): reverse spectral response distribution;

[0046] S front (λ): front spectral response distribution;

[0047] Isc,rear: reverse short-circuit current;

[0048] Isc,front is the front short-circuit current.

[0049] According to formulas (6) and (7), the spectral mismatch correction is performed on the front or back of the high-efficiency bifacial solar photovoltaic module:

[0050]

[0051] I SC，front or rear =I meas , front or rear / MM front or rear (7);

[0053] in,

[0054] MMfront or rear: front or rear spectral mismatch factor;

[0055] E ref (λ): standard solar spectrum (AM1.5) distribution;

[0056] S sample，front or rear (λ): is the spectral response of the front or back side of the sample being tested;

[0057] E meas (λ): spectral distribution of the solar simulator under test;

[0058] S ref (λ): spectral response of WPVS standard;

[0059] I SC，front or rear : Positive or negative short-circuit current correction value;

[0060] I meas，front or rear : Front or back short-circuit current measurement value;

[0061] Revision I SC ,I mpp , Pmxa The test data is used to complete the IV characteristics test of high-efficiency double-sided solar photovoltaic modules.

[0062] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0063] The present invention can accurately carry out the detection work of high-efficiency double-sided solar photovoltaic modules. After a large number of uses and verifications, the present invention can effectively ensure the accuracy of the detection of high-efficiency double-sided solar photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a schematic diagram of the structure of the present invention.

[0065] Figure 2 This is the effect result diagram. DETAILED DESCRIPTION

[0066] like Figure 1 As shown, the present invention includes:

[0067] A supporting frame 1, wherein the supporting frame 1 comprises a left frame 11 and a right frame 12;

[0068] The upper support rod 2 has two ends connected to the left frame 11 and the right frame 12 respectively;

[0069] The lower support rod 3 is located below the upper support rod 2 and is parallel to the upper support rod 2, and its two ends are respectively connected to the left frame 11 and the right frame 12;

[0070] The sliding positioning mechanism 4 is used to fix the photovoltaic assembly between the upper support rod 2 and the lower support rod 3, and can make the photovoltaic assembly move along the axial direction of the upper support rod 2 and the lower support rod 3.

[0071] When installing the photovoltaic module in the present invention, the two sides of the photovoltaic module are connected to the upper support rod 2 and the lower support rod 3 respectively through the sliding positioning mechanism 4, so that the photovoltaic module is installed between the upper support rod 2 and the lower support rod 3. In the present invention, the photovoltaic module can also be moved along the axial direction of the upper support rod 2 and the lower support rod 3. There are various structural forms of the sliding positioning mechanism 4 in the present invention, which can be realized by adopting various existing conventional structures. For example, the sliding positioning mechanism 4 can include a plurality of sliding connectors, and the sliding connector includes a connecting part detachably connected to the photovoltaic module and a sliding part slidably inserted on the support rod (upper support rod 2 or lower support rod 3). There are various detachable connection methods with the photovoltaic module, which can be adopted by various existing conventional methods, for example, a snap-on method can be adopted.

[0072] like Figure 1As shown, the support frame 1 in the present invention further includes an upper frame 13 and a lower frame 14, wherein the upper frame 13 is provided with a standard battery 5 that can move in the X direction and / or the Y direction, and the lower frame 14 is provided with a monitoring battery 6. The standard battery 5 in the present invention can also move in the X direction and the Y direction according to the test needs, and there are many ways to achieve the movement of the standard battery 5 in the X direction and the Y direction, for example, a slider and a slide rail can be used, and when the position of the standard battery 5 needs to be adjusted, the slider connected to the standard battery 5 can be moved along the slide rail.

[0073] like Figure 1 As shown, the present invention also includes an infrared probe for monitoring the temperature of the photovoltaic assembly, and the infrared probe is arranged on the upper support rod 2.

[0074] In the present invention, the left frame 11 includes a left slide rail, and the right frame 12 includes a right slide rail. The two ends of the upper support rod 2 are connected to the left slide rail and the right slide rail, respectively, and can slide relative to the left slide rail and the right slide rail. In the present invention, the area between the upper support rod 2 and the lower support rod 3 can also be adjusted, and the upper support rod 2 can be driven to move upward or downward along the left slide rail and the right slide rail. After reaching the required width, the connection end of the upper support rod 2 and the left slide rail and the right slide rail is locked to prevent the upper support rod 2 from continuing to move along the left slide rail and the right slide rail. In the present invention, when the upper support rod 2 is connected to the left slide rail and the right slide rail, sliders can be respectively set at the two ends of the upper support rod 2, and then the sliders at the two ends are respectively connected to the left slide rail and the right slide rail. When the upper support rod 2 does not need to be moved, the slider can be locked by a locking member to prevent movement. The present invention can also be provided with a pulley assembly connected to the slider to achieve balance control of the upper support rod 2.

[0075] The present invention also provides a detection method using the above-mentioned high-efficiency double-sided solar photovoltaic module detection device, comprising:

[0076] The spectral radiation non-uniformity test is carried out on the detection area of ​​the detection device, the average value of all points is calculated, the standard battery is positioned at the average spectral radiation point, and correction is performed according to formula (1):

[0077] I CF =I P-WPVS / I P-AVE *I (1);

[0079] Among them, I CF is the corrected current, I P-WPVS is the wpvs operating point current, I P-AVE is the average current of all points in the detection area, I is the current;

[0080] The temperature of the photovoltaic module is collected by an infrared probe, and then the temperature coefficient of the IV characteristic is corrected according to formulas (2) and (3):

[0081] I2=I1+I sc [G2 / G1-1]+α(T2-T1) (2);

[0083] V2=V1-R S (I2-I1)-KI2(T2-T1)+β(T2-T1) (3);

[0085] in,

[0086] I1, V1—coordinates of measured characteristic points;

[0087] I2, V2—coordinates of the points corresponding to the correction characteristics;

[0088] I sc —Measured short-circuit current value of the sample;

[0089] G1—Measured irradiance of standard solar cells;

[0090] G2—standard irradiance of standard solar cells;

[0091] T1—measured temperature of the sample;

[0092] T2—standard temperature, or other desired temperature;

[0093] α and β—the temperature coefficients of current and voltage of the specimen under standard or other desired irradiance and over the temperature range of interest (α is positive and β is negative);

[0094] R s —Internal series resistance of the specimen;

[0095] K—curve correction coefficient.

[0096] Scan the IV characteristics of the photovoltaic module once in the forward and reverse directions, and calculate the number of divisions required according to formula (4) to eliminate the capacitance effect:

[0097] (P backward -P forward ) / (P backward +P forward )*100%<0.5%(4);

[0098] Among them, Pbackward: reverse power; Pforward: forward power

[0099] Eliminate reflection and transmission according to formula (5):

[0100]

[0101] in,

[0102] Isc,rear: reverse short-circuit current;

[0103] T(λ): transmittance distribution;

[0104] R(λ): reflectivity distribution;

[0105] S rear (λ): reverse spectral response distribution;

[0106] S front (λ): front spectral response distribution;

[0107] Isc,rear: reverse short-circuit current;

[0108] Isc,front is the front short-circuit current.

[0109] According to formulas (6) and (7), the spectral mismatch correction is performed on the front or back of the high-efficiency bifacial solar photovoltaic module:

[0110]

[0111] I SC，front or rear =I meas，front or rear / MM front or rear (7);

[0113] in,

[0114] MMfront or rear: front or rear spectral mismatch factor;

[0115] E ref (λ): standard solar spectrum (AM1.5) distribution;

[0116] S sample，front or rear (λ): is the spectral response of the front or back side of the sample being tested;

[0117] E meas (λ): spectral distribution of the solar simulator under test;

[0118] S ref (λ): spectral response of WPVS standard;

[0119] I SC，front or rear : Positive or negative short-circuit current correction value;

[0120] I meas，front or rear : Front or back short-circuit current measurement value;

[0121] Revision I SC ,I mpp , P mxa The test data is used to complete the IV characteristics test of high-efficiency double-sided solar photovoltaic modules.

[0122] The present invention was used to compare two high-efficiency double-sided solar photovoltaic modules with the Fraunhofer Institute for Solar Energy (Fraunhofer-ISE) in Germany. The comparison results are shown in Figure 2 , the benchmark results are within the tolerance range of ±0.30%, and this method has been reliably verified.

Claims

1. An efficient double-sided solar photovoltaic module detection device, a support frame, the support frame includes a left frame and a right frame; An upper support rod, with two ends respectively connected to the left frame and the right frame; The lower support rod is located below the upper support rod and is parallel to the upper support rod, and its two ends are respectively connected to the left frame and the right frame; The sliding positioning mechanism is used to fix the photovoltaic assembly between the upper support rod and the lower support rod, and can make the photovoltaic assembly move along the axial direction of the upper support rod and the lower support rod; The support frame further comprises an upper frame and a lower frame, the upper frame is provided with a standard battery movable in the X direction and / or the Y direction, and the lower frame is provided with a monitoring battery; It also includes an infrared probe for monitoring the temperature of the photovoltaic assembly, wherein the infrared probe is arranged on the upper support rod; The left frame includes a left slide rail, the right frame includes a right slide rail, and both ends of the upper support rod are respectively connected to the left slide rail and the right slide rail and can slide relative to the left slide rail and the right slide rail.

2. A high-efficiency double-sided solar photovoltaic module detection method, characterized in that: The high-efficiency double-sided solar photovoltaic module detection device as claimed in claim 1 comprises: The spectral radiation non-uniformity test is performed on the detection area of ​​the high-efficiency double-sided solar photovoltaic module detection device, the average value of all points is calculated, the standard cell is positioned at the average spectral radiation point, and correction is performed according to formula (1): I CF =I P-WPVS / I P-AVE *I (1); Among them, I CF is the corrected current, I P-WPVS is the wpvs operating point current, I P-AVE is the average current of all points in the detection area, I is the current; The temperature of the photovoltaic module is collected by an infrared probe, and then the temperature coefficient of the IV characteristic is corrected according to formulas (2) and (3): I2=I1+I sc [G2 / G1-1]+α(T2-T1) (2); V2=V1-R S (I2-I1)-KI2(T2-T1)+β(T2-T1) (3); in, I1, V1—coordinates of measured characteristic points; I2, V2—coordinates of the points corresponding to the correction characteristics; I sc —Measured short-circuit current value of the sample; G1—Measured irradiance of standard solar cells; G2—standard irradiance of standard solar cells; T1—measured temperature of the sample; T2—standard temperature; α and β—temperature coefficients of current and voltage of the sample under standard or required irradiance and within the required temperature range; R s —Internal series resistance of the specimen; K—curve correction coefficient; Scan the IV characteristics of the photovoltaic module once in the forward and reverse directions, and calculate the number of divisions required according to formula (4) to eliminate the capacitance effect: (P backward -P forward ) / (P backward +P forward )*100%<0.5 (4); Among them, P backward : Reverse power; P forward :Forward power Eliminate reflection and transmission according to formula (5): in, I sc,rear : Reverse short-circuit current; T(λ): transmittance distribution; R(λ): reflectivity distribution; S rear (λ): reverse spectral response distribution; S front (λ): front spectral response distribution; I sc,rear : Reverse short-circuit current; I sc,front : Positive short-circuit current; According to formulas (6) and (7), the spectral mismatch correction is performed on the front or back of the high-efficiency bifacial solar photovoltaic module: I SC，frontorrear =I meas，frontorrear / MM frontorrear (7); in, MM frontorrear : positive or negative spectral mismatch factor; E ref (λ): standard solar spectrum AM1.5 distribution; S sample，frontorrear (λ): is the spectral response of the front or back side of the sample being tested; E meas (λ): spectral distribution of the solar simulator under test; S ref (λ): spectral response of WPVS standard; I SC，frontorrear : Positive or negative short-circuit current correction value; I meas，frontorrear : Front or back short-circuit current measurement value; Revision I SC ,I mpp , P mxa The test data is used to complete the IV characteristics test of high-efficiency double-sided solar photovoltaic modules.

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