Photovoltaic energy storage inverter aging test system

Abstract

The invention relates to the technical field of photovoltaic energy storage inverter aging test, and discloses a photovoltaic energy storage inverter aging test system, which comprises an input end voltage data acquisition unit and an input end current data acquisition unit. According to the aging test system for the photovoltaic energy storage inverter, various numerical values generated in the test process of the photovoltaic energy storage inverter are acquired in real time, and input voltage data, input current data, output voltage data and output current data are calculated according to a certain acquisition period; the efficiency, the voltage total harmonic distortion rate, the current total harmonic distortion rate and the failure rate of the photovoltaic energy storage inverter in the testing process are obtained, and fitting is carried out according to the data to generate a comprehensive score of the aging test of the photovoltaic energy storage inverter. And a tester determines the aging degree of the inverter according to the comprehensive score of the aging test of the photovoltaic energy storage inverter, so that the tester is prevented from participating in calculation of a test result, and the accuracy of the test result is improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic energy storage inverter aging test technology, specifically to a photovoltaic energy storage inverter aging test system. Background Technology

[0002] A photovoltaic (PV) energy storage inverter is a device that converts direct current (DC) generated by solar panels into alternating current (AC) and also has energy storage capabilities. It not only converts solar energy into usable electricity but also stores excess power in batteries for later use. These inverters are commonly used in residential and commercial solar power systems to improve energy efficiency and reduce reliance on the traditional power grid.

[0003] Aging tests play a crucial role in the research, development, production, and quality control of photovoltaic (PV) energy storage inverters. By simulating long-term stress conditions in real-world operating environments, such as temperature cycling, voltage fluctuations, and humidity changes, aging tests assess the reliability and performance stability of inverters, thereby predicting their lifespan and identifying potential failure modes in advance. This not only helps manufacturers optimize product design and improve manufacturing processes but also ensures that products meet industry standards and regulatory requirements, ultimately enhancing market competitiveness and customer trust. Through rigorous aging tests, PV energy storage inverters can better withstand the complex environments of real-world operation, improving the overall stability and economic efficiency of the system.

[0004] Aging tests for photovoltaic (PV) energy storage inverters typically require continuous testing for weeks or even months to obtain changes in various data of the PV energy storage inverter. However, the current aging test systems for PV energy storage inverters have a low level of intelligence. When there is a large amount of data, relying on manual judgment of the aging test results based on various data can easily lead to large errors in the test results. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a photovoltaic (PV) energy storage inverter aging test system. This system features real-time acquisition of various values ​​generated by the PV energy storage inverter during testing. It calculates the corresponding PV energy storage inverter efficiency, total harmonic distortion (THD) rate, total harmonic distortion (THD) rate, and failure rate during testing based on the input voltage, input current, output voltage, and output current data according to a specific acquisition cycle. Furthermore, it uses these data to generate a comprehensive aging test score for the PV energy storage inverter. Testers determine the degree of inverter aging based on this comprehensive score, thus avoiding the need for testers to participate in the calculation of test results and improving the accuracy of the test results. This system solves the aforementioned problems.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a photovoltaic energy storage inverter aging test system, comprising an input voltage data acquisition unit, an input current data acquisition unit, an output voltage data acquisition unit, an output current data acquisition unit, a fault log acquisition unit, a test data analysis unit, and a result output unit; The input voltage data acquisition unit is used to acquire real-time input voltage data during the testing process of the photovoltaic energy storage inverter and send the real-time input voltage data to the test data analysis unit. The input current data acquisition unit is used to acquire real-time input current data during the testing process of the photovoltaic energy storage inverter and send the real-time input current data to the test data analysis unit. The output voltage data acquisition unit is used to acquire real-time output voltage data during the testing process of the photovoltaic energy storage inverter and send the real-time output voltage data to the test data analysis unit. The output current data acquisition unit is used to acquire real-time output current data during the testing process of the photovoltaic energy storage inverter and send the real-time output current data to the test data analysis unit. The fault log acquisition unit is used to record the number of faults during the photovoltaic energy storage inverter test and sends the number of faults during the photovoltaic energy storage inverter test to the test data analysis unit. The test data analysis unit calculates the input power of the photovoltaic energy storage inverter during the test based on the real-time input voltage data and the real-time input current data. The test data analysis unit also calculates the efficiency of the photovoltaic energy storage inverter based on the real-time output voltage data and the output power during the test, and calculates the efficiency of the photovoltaic energy storage inverter based on the input power and the output power. The test data analysis unit calculates real-time fundamental voltage data based on real-time output voltage data, calculates real-time fundamental current data based on real-time output current data, and calculates total harmonic distortion of voltage and total harmonic distortion of current based on multiple real-time fundamental voltage data and multiple real-time fundamental current data. The test data analysis unit calculates the failure rate of the photovoltaic energy storage inverter during the test based on the number of failures during the test process. The photovoltaic energy storage inverter efficiency, voltage total harmonic distortion rate, current total harmonic distortion rate, and failure rate during the photovoltaic energy storage inverter testing process are calculated to generate a comprehensive score for the photovoltaic energy storage inverter aging test, and the comprehensive score for the photovoltaic energy storage inverter aging test is sent to the result output unit. The result output unit sends a comprehensive score for the aging test of the photovoltaic energy storage inverter to the tester.

[0007] Preferably, the plurality of real-time input voltage data are respectively represented as follows: The multiple real-time input current data are respectively represented as follows: The multiple real-time output voltage data are respectively represented as follows: The various real-time output current data are respectively represented as follows: Furthermore, the acquisition cycle, acquisition interval, and acquisition quantity of real-time input voltage data, real-time input current data, real-time output voltage data, and real-time output current data are all the same.

[0008] Preferably, the input power calculation expression is as follows:

[0009] In the formula, Indicates the first One input power, Indicates input power. Indicates the first Real-time input voltage data. Indicates the first Real-time input current data; The expression for calculating the output power is as follows:

[0010] In the formula, Indicates the first Each output power, Indicates output power. Indicates the first Real-time output voltage data, Indicates the first Real-time output current data, It represents the phase angle between voltage and current.

[0011] Preferably, the efficiency calculation expression for the photovoltaic energy storage inverter is as follows:

[0012] In the formula, Indicates the efficiency of a photovoltaic energy storage inverter. This represents the summation of all calculated output powers. This represents the summation of all calculated input powers.

[0013] Preferably, the fundamental voltage data is calculated using the following expression:

[0014] In the formula, This represents the fundamental voltage data. In This indicates the acquisition period for real-time output voltage data. This represents a time function that indicates the real-time output voltage data. Represents the fundamental cosine function. The dominant frequency of the voltage signal. Indicates the collection period Inside and The product integral is used to extract the amplitude of the fundamental component in the voltage signal. The square root of the integral result represents the fundamental voltage data. .

[0015] Preferably, the fundamental current data is calculated using the following expression:

[0016] In the formula, This represents the fundamental current data. In This indicates the acquisition period for real-time output current data. The time function representing the real-time output current data. Indicated during the collection period Inside and The product integral is used to extract the amplitude of the fundamental component in the current signal. The square root of the integral result represents the fundamental current data. .

[0017] Preferably, the expression for calculating the total harmonic distortion rate of the voltage is as follows:

[0018] In the formula, Indicates the total harmonic distortion of voltage. This represents the fundamental voltage data from the first data acquisition cycle during the aging test of the photovoltaic energy storage inverter. Indicates a total of fundamental voltage data This indicates that the fundamental voltage data from the second acquisition cycle will be used to... The sum of squares of the fundamental voltage data in each acquisition cycle. This indicates that the effective value of voltage harmonics is obtained after opening the sum of squares. The ratio of the effective value of voltage harmonics to the fundamental voltage data from the first acquisition cycle is expressed as the total harmonic distortion (THD). .

[0019] Preferably, the expression for calculating the total harmonic distortion rate of the current is as follows:

[0020] In the formula, This represents the total harmonic distortion rate of the current. This represents the fundamental current data from the first data acquisition cycle during the aging test of the photovoltaic energy storage inverter. Indicates a total of One fundamental current data point, This indicates that the fundamental current data from the second acquisition cycle will be used to... The sum of squares of the fundamental current data in each acquisition cycle. This indicates that the effective value of the current harmonics is obtained after opening the sum of squares. The ratio of the effective value of current harmonics to the fundamental current data from the first acquisition cycle is expressed as the total harmonic distortion rate of the current. .

[0021] Preferably, the failure rate calculation expression during the testing process of the photovoltaic energy storage inverter is as follows:

[0022] In the formula, This indicates the failure rate during the testing process of photovoltaic energy storage inverters. This indicates the total duration of this photovoltaic energy storage inverter test. This indicates the number of failures during the testing process of the photovoltaic energy storage inverter.

[0023] Preferably, the comprehensive score calculation expression for the aging test of the photovoltaic energy storage inverter is as follows:

[0024] In the formula, This indicates the overall score of the aging test for photovoltaic energy storage inverters. This indicates a comprehensive score coefficient of 1. This indicates a comprehensive score coefficient of two. This indicates a comprehensive score coefficient of three. This indicates that the overall score coefficient is four, and the sum of the four overall score coefficients is 1.

[0025] Compared with the prior art, the present invention provides an aging test system for photovoltaic energy storage inverters, which has the following beneficial effects: This invention collects various values ​​generated by a photovoltaic energy storage inverter during testing in real time, and calculates the input voltage, input current, output voltage, and output current data according to a certain collection cycle. This yields the corresponding photovoltaic energy storage inverter efficiency, total harmonic distortion (THD) rate, total harmonic distortion (THD) rate, and failure rate during testing. Based on these data, a comprehensive aging test score for the photovoltaic energy storage inverter is generated. Testers determine the degree of inverter aging based on this comprehensive aging test score, thus avoiding the need for testers to participate in the calculation of test results and improving the accuracy of the test results. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1 An aging test system for photovoltaic energy storage inverters is disclosed. The system consists of an input voltage data acquisition unit, an input current data acquisition unit, an output voltage data acquisition unit, an output current data acquisition unit, a fault log acquisition unit, a test data analysis unit, and a result output unit.

[0029] The input voltage data acquisition unit is used to collect real-time input voltage data during the testing process of the photovoltaic energy storage inverter and send the real-time input voltage data to the test data analysis unit.

[0030] The input current data acquisition unit is used to collect real-time input current data during the testing process of the photovoltaic energy storage inverter and send the real-time input current data to the test data analysis unit.

[0031] The output voltage data acquisition unit is used to acquire real-time output voltage data during the testing process of the photovoltaic energy storage inverter and send the real-time output voltage data to the test data analysis unit.

[0032] The output current data acquisition unit is used to collect real-time output current data during the testing process of the photovoltaic energy storage inverter and send the real-time output current data to the test data analysis unit.

[0033] The fault log acquisition unit is used to record the number of faults during the testing process of the photovoltaic energy storage inverter and sends the number of faults during the testing process to the test data analysis unit.

[0034] The aforementioned real-time input voltage data, real-time output voltage data, real-time output current data, and real-time output voltage data are multiple, and the acquisition period, acquisition interval, and acquisition quantity of the real-time input voltage data, real-time input current data, real-time output voltage data, and real-time output current data are all the same. Multiple real-time input voltage data are represented as follows: The multiple real-time input current data are represented as follows: The multiple real-time output voltage data are represented as follows: The multiple real-time output current data are represented as follows: .

[0035] The test data analysis unit calculates the input power of the photovoltaic energy storage inverter during the test based on the real-time input voltage and current data. The specific calculation expression is as follows:

[0036] In the formula, Indicates the first One input power, Indicates input power. Indicates the first Real-time input voltage data. Indicates the first Real-time input current data; The test data analysis unit calculates the output power based on the real-time output voltage data and the output power during the test process using the real-time output voltage data as follows:

[0037] In the formula, Indicates the first Each output power, Indicates output power. Indicates the first Real-time output voltage data, Indicates the first Real-time output current data, This represents the phase angle between voltage and current; After calculating the input power and output power, the test data analysis unit calculates the efficiency of the photovoltaic energy storage inverter based on these two numerical solutions. The calculation expression is as follows:

[0038] In the formula, Indicates the efficiency of a photovoltaic energy storage inverter. This represents the summation of all calculated output powers. This represents the summation of all calculated input powers.

[0039] The test data analysis unit calculates the fundamental voltage data based on the real-time output voltage data. The calculation expression is as follows:

[0040] In the formula, This represents the fundamental voltage data. In This indicates the acquisition period for real-time output voltage data. This represents a time function that indicates the real-time output voltage data. Represents the fundamental cosine function. The dominant frequency of the voltage signal. Indicates the collection period Inside and The product integral is used to extract the amplitude of the fundamental component in the voltage signal. The square root of the integral result represents the fundamental voltage data. .

[0041] The test data analysis unit calculates the fundamental current data based on the real-time output current data. The calculation expression is as follows:

[0042] In the formula, This represents the fundamental current data. In This indicates the acquisition period for real-time output current data. The time function representing the real-time output current data. Indicated during the collection period Inside and The product integral is used to extract the amplitude of the fundamental component in the current signal. The square root of the integral result represents the fundamental current data. .

[0043] After the fundamental voltage and fundamental current data are calculated, the test data analysis unit calculates the total harmonic distortion (THD) of the voltage and the total harmonic distortion (THD) of the current based on the real-time output voltage data, as shown below: The expression for calculating the total harmonic distortion (THD) of voltage is as follows:

[0044] In the formula, Indicates the total harmonic distortion of voltage. This represents the fundamental voltage data from the first data acquisition cycle during the aging test of the photovoltaic energy storage inverter. Indicates a total of fundamental voltage data This indicates that the fundamental voltage data from the second acquisition cycle will be used to... The sum of squares of the fundamental voltage data in each acquisition cycle. This indicates that the effective value of voltage harmonics is obtained after opening the sum of squares. The ratio of the effective value of voltage harmonics to the fundamental voltage data from the first acquisition cycle is expressed as the total harmonic distortion (THD). ; 4. The expression for calculating the total harmonic distortion (THD) of the current is as follows:

[0045] In the formula, This represents the total harmonic distortion rate of the current. This represents the fundamental current data from the first data acquisition cycle during the aging test of the photovoltaic energy storage inverter. Indicates a total of One fundamental current data point, This indicates that the fundamental current data from the second acquisition cycle will be used to... The sum of squares of the fundamental current data in each acquisition cycle. This indicates that the effective value of the current harmonics is obtained after opening the sum of squares. The ratio of the effective value of current harmonics to the fundamental current data from the first acquisition cycle is expressed as the total harmonic distortion rate of the current. .

[0046] The test data analysis unit calculates the failure rate of the photovoltaic energy storage inverter during the test based on the number of failures, as detailed below:

[0047] In the formula, This indicates the failure rate during the testing process of photovoltaic energy storage inverters. This indicates the total duration of this photovoltaic energy storage inverter test. This indicates the number of failures during the testing process of the photovoltaic energy storage inverter.

[0048] After the test data analysis unit calculates the photovoltaic energy storage inverter efficiency, total harmonic distortion (THD) rate, total harmonic distortion (THD) rate, and failure rate during the test, the unit scores the photovoltaic energy storage inverter aging test based on these values. The specific formula for calculating the comprehensive score of the photovoltaic energy storage inverter aging test is as follows:

[0049] In the formula, This indicates the overall score of the aging test for photovoltaic energy storage inverters. This indicates a comprehensive score coefficient of 1. This indicates a comprehensive score coefficient of two. This indicates a comprehensive score coefficient of three. This indicates that the overall score coefficient is four, and the sum of the four overall score coefficients is 1.

[0050] It should be noted that, , , , Typically, the score is 25%. When the comprehensive score of the aging test of the photovoltaic energy storage inverter is greater than 50, it means that the photovoltaic energy storage inverter has begun to age. In other words, the higher the score, the higher the degree of aging of the photovoltaic energy storage inverter.

[0051] After the comprehensive score of the aging test of the photovoltaic energy storage inverter is generated, the test data analysis unit sends the score to the result output unit. The testers judge the degree of aging of the photovoltaic energy storage inverter based on the results output by the result output unit.

[0052] By collecting various values ​​generated by the photovoltaic energy storage inverter during the testing process in real time, and calculating the input voltage data, input current data, output voltage data, and output current data according to a certain collection cycle, the corresponding photovoltaic energy storage inverter efficiency, voltage total harmonic distortion rate, current total harmonic distortion rate, and failure rate during the photovoltaic energy storage inverter testing process are obtained. Based on these data, a comprehensive score for the aging test of the photovoltaic energy storage inverter is generated. Testers determine the degree of inverter aging based on the comprehensive score for the aging test of the photovoltaic energy storage inverter, thereby avoiding the need for testers to participate in the calculation of test results and thus improving the accuracy of test results.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An aging test system for photovoltaic energy storage inverters, characterized in that: It includes an input voltage data acquisition unit, an input current data acquisition unit, an output voltage data acquisition unit, an output current data acquisition unit, a fault log acquisition unit, a test data analysis unit, and a result output unit; The input voltage data acquisition unit is used to acquire real-time input voltage data during the testing process of the photovoltaic energy storage inverter and send the real-time input voltage data to the test data analysis unit. The input current data acquisition unit is used to acquire real-time input current data during the testing process of the photovoltaic energy storage inverter and send the real-time input current data to the test data analysis unit. The output voltage data acquisition unit is used to acquire real-time output voltage data during the testing process of the photovoltaic energy storage inverter and send the real-time output voltage data to the test data analysis unit. The output current data acquisition unit is used to acquire real-time output current data during the testing process of the photovoltaic energy storage inverter and send the real-time output current data to the test data analysis unit. The fault log acquisition unit is used to record the number of faults during the photovoltaic energy storage inverter test and sends the number of faults during the photovoltaic energy storage inverter test to the test data analysis unit. The test data analysis unit calculates the input power of the photovoltaic energy storage inverter during the test based on the real-time input voltage data and the real-time input current data. The test data analysis unit also calculates the efficiency of the photovoltaic energy storage inverter based on the real-time output voltage data and the output power during the test, and calculates the efficiency of the photovoltaic energy storage inverter based on the input power and the output power. The test data analysis unit calculates the fundamental voltage data based on the real-time output voltage data, calculates the fundamental current data based on the real-time output current data, and calculates the total harmonic distortion rate of voltage and the total harmonic distortion rate of current based on the fundamental voltage data and the fundamental current data. The test data analysis unit calculates the failure rate of the photovoltaic energy storage inverter during the test based on the number of failures during the test process. The photovoltaic energy storage inverter efficiency, voltage total harmonic distortion rate, current total harmonic distortion rate, and failure rate during the photovoltaic energy storage inverter testing process are calculated to generate a comprehensive score for the photovoltaic energy storage inverter aging test, and the comprehensive score for the photovoltaic energy storage inverter aging test is sent to the result output unit. The result output unit sends a comprehensive score for the aging test of the photovoltaic energy storage inverter to the tester.

2. The photovoltaic energy storage inverter aging test system according to claim 1, characterized in that: The various real-time input voltage data are respectively represented as follows: The multiple real-time input current data are respectively represented as follows: The multiple real-time output voltage data are respectively represented as follows: The various real-time output current data are respectively represented as follows: Furthermore, the acquisition cycle, acquisition interval, and acquisition quantity of real-time input voltage data, real-time input current data, real-time output voltage data, and real-time output current data are all the same.

3. The photovoltaic energy storage inverter aging test system according to claim 2, characterized in that: The input power calculation expression is as follows: ； In the formula, Indicates the first One input power, Indicates input power. Indicates the first Real-time input voltage data. Indicates the first Real-time input current data; The expression for calculating the output power is as follows: ； In the formula, Indicates the first Each output power, Indicates output power. Indicates the first Real-time output voltage data, Indicates the first Real-time output current data, It represents the phase angle between voltage and current.

4. The photovoltaic energy storage inverter aging test system according to claim 4, characterized in that: The efficiency calculation formula for the photovoltaic energy storage inverter is as follows: ； In the formula, Indicates the efficiency of a photovoltaic energy storage inverter. This represents the summation of all calculated output powers. This represents the summation of all calculated input powers.

5. The photovoltaic energy storage inverter aging test system according to claim 4, characterized in that: The fundamental voltage data is calculated using the following expression: ； In the formula, This represents the fundamental voltage data. In This indicates the acquisition period for real-time output voltage data. This represents a time function that indicates the real-time output voltage data. Represents the fundamental cosine function. The dominant frequency of the voltage signal. Indicates the collection period Inside and The product integral is used to extract the amplitude of the fundamental component in the voltage signal. The square root of the integral result represents the fundamental voltage data. .

6. The photovoltaic energy storage inverter aging test system according to claim 5, characterized in that: The fundamental current data is calculated using the following expression: ； In the formula, This represents the fundamental current data. In This indicates the acquisition period for real-time output current data. This represents the time function of the real-time output current data. Indicated during the collection period Inside and The product integral is used to extract the amplitude of the fundamental component in the current signal. The square root of the integral result represents the fundamental current data. .

7. The photovoltaic energy storage inverter aging test system according to claim 6, characterized in that: The expression for calculating the total harmonic distortion rate of voltage is as follows: ； In the formula, Indicates the total harmonic distortion of voltage. This represents the fundamental voltage data from the first data acquisition cycle during the aging test of the photovoltaic energy storage inverter. Indicates a total of fundamental voltage data This indicates that the fundamental voltage data from the second acquisition cycle will be used to... The sum of squares of the fundamental voltage data in each acquisition cycle. This indicates that the effective value of the voltage harmonics is obtained after opening the sum of squares. The ratio of the effective value of voltage harmonics to the fundamental voltage data from the first acquisition cycle is expressed as the total harmonic distortion (THD). .

8. The photovoltaic energy storage inverter aging test system according to claim 7, characterized in that: The expression for calculating the total harmonic distortion rate of the current is as follows: ； In the formula, This represents the total harmonic distortion rate of the current. This represents the fundamental current data from the first data acquisition cycle during the aging test of the photovoltaic energy storage inverter. Indicates a total of One fundamental current data point, This indicates that the fundamental current data from the second acquisition cycle will be used to... The sum of squares of the fundamental current data in each acquisition cycle. This indicates that the effective value of the current harmonics is obtained after opening the sum of squares. The ratio of the effective value of current harmonics to the fundamental current data from the first acquisition cycle is expressed as the total harmonic distortion rate of the current. .

9. The photovoltaic energy storage inverter aging test system according to claim 8, characterized in that: The formula for calculating the failure rate during the testing process of the photovoltaic energy storage inverter is as follows: ； In the formula, This indicates the failure rate during the testing process of photovoltaic energy storage inverters. This indicates the total duration of this photovoltaic energy storage inverter test. This indicates the number of failures during the testing process of the photovoltaic energy storage inverter.

10. The photovoltaic energy storage inverter aging test system according to claim 9, characterized in that: The formula for calculating the comprehensive score of the aging test of the photovoltaic energy storage inverter is as follows: ； In the formula, This indicates the overall score of the aging test for photovoltaic energy storage inverters. This indicates a comprehensive score coefficient of 1. This indicates a comprehensive score coefficient of two. This indicates a comprehensive score coefficient of three. This indicates that the overall score coefficient is four, and the sum of the four overall score coefficients is 1.

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