CN104617876B - Outdoor test platform of solar photovoltaic modules and electricity generation performance online analysis method thereof - Google Patents

Abstract

The invention discloses an outdoor testing platform for solar photovoltaic components and an online analysis method for power generation performance, which includes two sets of photovoltaic components, a capacitor group, a power resistor, a charging control circuit board, a storage battery and a plurality of one-way switches; the charging control circuit board includes CPU, irradiance measurement module, temperature measurement module and storage module; the CPU realizes the switching of two groups of photovoltaic modules by controlling the on-off of the one-way switch, and collects the battery electrolyte temperature at the same time, and executes the battery charging strategy according to the future weather conditions . The method for on-line analysis of module power generation performance in the present invention includes: sending the data measured by the platform to the remote control computer in real time; dividing the module backplane temperature and module coplanar irradiance at the same time; generating power generation divided by temperature and irradiance The histogram; Finally, a comparative analysis chart of the power generation of the two components is generated. The invention realizes the comparison and evaluation of the power generation performance of two groups of solar photovoltaic components under the complex outdoor working environment.

Description

An outdoor test platform for solar photovoltaic modules and an online analysis method for power generation performance

technical field

The invention relates to an outdoor test platform of a solar photovoltaic module and an online analysis method for power generation performance, belonging to the technical field of solar energy.

Background technique

With the rapid development of science and technology, the demand for energy is increasing at home and abroad, especially after entering the 21st century, energy issues are becoming important issues in society, economy, environment, etc. Green renewable resources are playing an increasingly important role in the world energy crisis. In recent years, the domestic solar photovoltaic industry has developed rapidly. The output of photovoltaic modules of various photovoltaic companies has increased year by year, and the reliability of photovoltaic modules has been increasing. Comprehensive measurement has become an indispensable step in the production process of various photovoltaic enterprises.

At present, the test environment of solar cells and modules in domestic photovoltaic enterprises is mainly based on indoor solar simulators, which artificially control the environment in which cells and modules are located, so as to obtain the IV characteristics of solar cells or photovoltaic modules in different environments The advantage is that it can manually control the working environment requirements such as irradiance, temperature, and component stress, and can simulate various harsh test environments to obtain the limit work that the components can adapt to. environment. However, it has obvious defects. There is a difference between the indoor simulated sunlight and the actual light. Since the environment is artificially simulated, it cannot effectively reflect the real state of the components in the complex outdoor working environment. Therefore, it is extremely important to establish an outdoor test platform for photovoltaic modules to monitor their IV characteristic curves in outdoor environments.

Contents of the invention

Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide an outdoor testing platform for solar photovoltaic components and an online analysis method for power generation performance, which can effectively reflect the real state of the components in an outdoor complex working environment, and the power generation performance of the present invention is online The analysis method realizes the comparative evaluation of the power generation performance of two sets of solar photovoltaic modules in complex outdoor working environments.

In order to achieve the above object, the present invention is achieved through the following technical solutions:

An outdoor testing platform for solar photovoltaic components of the present invention includes a storage battery, a charging control circuit board connected in parallel with the storage battery for controlling the components to charge the storage battery, a third one-way switch, and a third one-way switch connected in series with one end of the third one-way switch. A group of solar photovoltaic components, a fourth one-way switch, a second group of solar photovoltaic components connected in series with one end of the fourth one-way switch, a second one-way switch, and a capacitor for charging components connected in series with one end of the second one-way switch group and the first unidirectional switch and a power resistor connected in series with one end of the first unidirectional switch for discharging the capacitor group; the second unidirectional switch and the capacitor group are connected in parallel at both ends of the charging control circuit board; the third The one-way switch and the first group of solar photovoltaic components are connected in parallel at both ends of the second one-way switch and the capacitor group; the fourth one-way switch and the second group of solar photovoltaic components are also connected in parallel at the two ends of the second one-way switch and the capacitor group two ends; the first one-way switch and the power resistor are connected in parallel at the two ends of the capacitor group; the charging control circuit board includes a CPU module, a communication module connected to the CPU module, and a radiance for measuring the coplanar irradiance of the current component The illuminance measurement module, the first temperature measurement module installed in the backplane of the component and the air for measuring the temperature of the backplane of the component and the ambient temperature, the second temperature measurement module for measuring the temperature of the electrolyte of the battery, and the module connected to the CPU module A real-time clock module and a storage module; the storage module is used to store test time, IV characteristic curve data of components, current component coplanar irradiance data, component backplane temperature and ambient temperature data; the irradiance measurement module, The output ends of the first temperature measurement module and the second temperature measurement module are connected with the input ends of the CPU module; the communication module is connected with the host computer; the CPU module controls the first one-way switch, the second one-way switch, the second The three one-way switches and the fourth one-way switch are turned on and off to realize the switching measurement of the first group of solar photovoltaic modules and the second group of solar photovoltaic modules, and at the same time collect the electrolyte temperature of the battery, and according to the future weather sent by the host computer In this case, execute the corresponding battery charging strategy to charge the battery.

The battery charging strategy above is as follows: (1) Divide all kinds of weather into four grades of ABCD; among them, A: sunny; B: cloudy to sunny, sunny to cloudy; C: cloudy, cloudy to cloudy, light rain, showers to cloudy; D: Thunderstorm, shower turns to thunderstorm, heavy rain;

(2) Calculate the average irradiance and the average temperature of the module backplane under various weather conditions according to the weather station data of the previous year and the module backplane temperature;

(3) Estimate the power generation of each module under various weather conditions based on the average irradiance and module backplane temperature under various weather conditions; and then calculate the future The rechargeable capacity N of the components to the battery for one week;

(4) Estimating the remaining capacity of the battery by measuring the open circuit voltage of the battery, defining the difference between the total capacity of the battery and the current capacity as M;

(5) Implement different battery charging strategies according to different N and M values. The steps are as follows: 1. If N<M, control the current component to work at the maximum output power point and output the maximum power; Flow charging, synchronously collect the temperature T of the electrolyte, if T>40°C, stop charging, otherwise continue;

2. If M<N<2M, a.90Ah>M>＝60Ah

1. When M is between 70Ah and 90Ah, the battery is charged with a constant current I=0.08C;

2. M is between 60Ah and 70Ah, and the battery is charged at the rated voltage;

b.60Ah>M>=30Ah

1. When M is between 40Ah and 60Ah, the battery is charged with a constant current I=0.05C;

2. M is between 30Ah and 40Ah, and the battery is charged at the rated voltage;

c.30Ah>M>=5Ah

1. When M is between 25Ah and 30Ah, the battery is charged with a constant current I=0.05C;

2. When M is between 15Ah and 25Ah, the battery is charged with a constant current I=0.03C;

3. M is between 5Ah and 15Ah, and the battery is charged at the rated voltage;

d. If M is between 0Ah and 5Ah, the battery will be float-charged at the float-charge voltage;

3. If N>2M, then 1. The battery is charged with a constant current I=0.03C to increase the battery capacity by 10%M;

2. The battery is charged with a constant current I=0.08C, which increases the battery capacity by 30%M;

3. The battery is charged at the rated voltage to increase the battery capacity by 30%M;

4. The battery is charged with a constant current I=0.03C to increase the battery capacity by 20%M;

5. The battery is float-charged at the float-charge voltage.

In step (5), the method for determining the maximum power of the first group of solar photovoltaic components is as follows: by controlling the closing of the third one-way switch and the second one-way switch, the opening of the first one-way switch and the fourth one-way switch On, the first group of solar photovoltaic components is connected to the capacitor bank to charge the capacitor bank, and the IV characteristic curve of the first group of solar photovoltaic components is collected while charging, and the current maximum current maximum value of the first group of solar photovoltaic components is calculated according to the curve. Output power; the method for determining the maximum power of the second group of solar photovoltaic components is as follows: by controlling the closing of the fourth one-way switch and the second one-way switch, the opening of the first one-way switch and the third one-way switch, then The second group of solar photovoltaic components is connected to the capacitor bank to charge the capacitor bank, and the IV characteristic curve of the second group of solar photovoltaic components is collected while charging, and the current maximum output power of the second group of solar photovoltaic components is calculated according to the curve.

By controlling the first unidirectional switch to be closed, the second unidirectional switch, the third unidirectional switch and the fourth unidirectional switch are turned off, and the capacitor group is discharged through the power resistor.

What the above-mentioned CPU module adopts is the DSP chip TMS320F28035 produced by TI Company.

The above-mentioned irradiance measurement module uses a silicon irradiance sensor produced by IMT Solar.

The above-mentioned first temperature measurement module adopts a temperature sensor, and the temperature sensor specifically adopts a plurality of Pt100 platinum thermal resistances.

The online analysis method of power generation performance of components based on the above-mentioned outdoor test platform includes the following steps:

(S1) Send the data measured by the outdoor test platform to the remote control computer in real time through the communication module, and store it in the database; the outdoor test platform measures a set of data every five seconds, and each set of data includes the time when the data is collected value; the IV characteristic curve data of two modules, the IV characteristic curve of each module contains the voltage value and current value of 256 module working points; the radiation value measured by the coplanar irradiator of the current module; two The temperature value of the temperature test point and the temperature value of the environment; the current short-circuit current value, open-circuit voltage value, power value and current and voltage value at the maximum power point of the component;

(S2) Convert the power unit of the solar photovoltaic module into KWh. The outdoor test platform measures a set of data every five seconds, calculates the power generation of the module every five seconds, and compares the temperature of the backplane of the module and the co-planar radiation of the module at the same time. The illuminance is divided, and the total power generation of the two components in each temperature range and irradiation range is calculated;

(S3) After sending all the measured data of the outdoor test platform to the remote control computer every day, the first histogram of the power generation of the two components in each temperature range is automatically generated by temperature, and the second is divided by irradiance. The histogram of the power generation of the two divided components in each irradiation interval, and the line graph of the power generation of the two components at each time point throughout the day;

(S4) When the database has one month's data, automatically generate a comparative analysis chart of the power generation of the two components in the current month, and display various performance parameters of the two components in real time according to the measured data.

In step (S2), the module backplane temperature is from 10°C to 60°C every 5°C, and the module coplanar radiation is from 0 to 1300W/ ^m2 every 100W/ ^m2 is an interval.

The invention can realize the switching measurement of two groups of solar photovoltaic components through the charging control circuit board. The currently measured environmental factors (solar irradiance, component temperature, and ambient temperature) of the solar photovoltaic module can be displayed in real time on the remote control computer, which can truly reflect the working conditions of the solar photovoltaic module under different meteorological conditions; The IV characteristic curve test experiment in the outdoor environment realizes the comparative evaluation of the power generation performance of two sets of solar photovoltaic modules in a specific environment.

Description of drawings

Fig. 1 is the outdoor test platform principle block diagram of solar photovoltaic module of the present invention;

Fig. 2 is a working flow chart of the outdoor test platform of the solar photovoltaic module of the present invention.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

Referring to Fig. 1, the outdoor test platform of the present invention comprises a first group of solar photovoltaic components 101, a second group of solar photovoltaic components 102, a capacitor group 103, a power resistor 104, a charging control circuit board 105, and a storage battery 106. A third one-way switch 109 and a fourth one-way switch 110 are respectively connected between the component 101 and the second group of solar photovoltaic components 102, and a second one-way switch 108 is connected between the capacitor bank 103 and the charging control circuit board 105. The control circuit board 105 is connected in parallel with the capacitor bank 103 and the storage battery 106 respectively. The capacitor bank 103 is composed of 4 electrolytic capacitors connected in series and parallel.

Among them, the output lines of the first group of solar photovoltaic components 101 are connected to the capacitor bank 103 through the fourth one-way switch 110 and the second one-way switch 108, and the output lines of the first group of solar photovoltaic components 102 are connected through the second one-way switch 108 , The third one-way switch 109 is connected to the capacitor bank 103 . The first unidirectional switch 107 , the second unidirectional switch 108 , the third unidirectional switch 109 , and the fourth unidirectional switch 110 can use low conduction MOSFET tubes to realize on-off current.

When the second one-way switch 108 and the fourth one-way switch 110 are turned on and the first one-way switch 107 and the third one-way switch 109 are turned off, the first group of solar photovoltaic components 101 is connected to the capacitor group 103, when the second one-way switch The one-way switch 108 and the fourth one-way switch 110 are turned off, the first one-way switch 107 and the third one-way switch 109 are turned on, and the second group of solar photovoltaic modules 102 is connected to the capacitor group 103 to test their respective working conditions.

The charging control circuit board 105 includes a CPU module, an AD sampling and conditioning circuit, an irradiance measurement module, a first temperature measurement module, a second temperature measurement module, a real-time clock module, a communication module, and a mass storage module.

The CPU module is connected to the AD sampling and conditioning circuit, the irradiance measurement module for measuring environmental factors, the first temperature measurement module and the second temperature measurement module are connected to the CPU module through the signal conditioning circuit; the large-capacity storage module and the 3G communication module are directly connected to the CPU Connected; Among them, the 3G communication module is connected with the upper computer through the 3G network.

The CPU module is a DSP chip TMS320F28035 produced by TI Company. Its built-in 16-channel 12-bit AD converter can realize the sampling of various analog signals and adjust the corresponding signal data. Among them, the signals that need to be sampled and adjusted include: the working voltage of the components at both ends of the capacitor bank, the working current of the components passing through the current sampling resistor, the backplane temperature of the two sets of solar photovoltaic components, the ambient temperature, and the solar irradiance.

After the DSP has sampled various analog signals, the measurement time, IV characteristic curve data, and environmental parameters are stored in the USB flash drive through the SPI bus; at the same time, the DSP is connected to the 3G mobile network through the 3G communication module of the test platform, so that the DSP can measure The data is sent to the remote control computer in real time and stored in the database. Among them, the large-capacity storage module can choose 8G USB flash drive, and the network can choose 3G mobile network. After the above work is completed, the test platform charges the battery with the corresponding charging strategy through the charging control circuit board.

See Figure 2, which is a work flow diagram of an outdoor testing platform for smart solar photovoltaic modules. The workflow is as follows:

(1A) Control the third one-way switch 109, the second one-way switch 108 to close, the first one-way switch 107, the fourth one-way switch 110 to disconnect, the first group of solar photovoltaic components 101 is connected to the capacitor group 103 103 charging, collecting the IV characteristic curve of the first group of solar photovoltaic modules 101 while charging. And calculate the current maximum output power of the component according to the measured curve.

(2A) Control the first one-way switch 107 to close, the second one-way switch 108, the third one-way switch 109, and the fourth one-way switch 110 to open, and the capacitor group 103 is discharged through the power resistor.

(3A) Control the fourth one-way switch 110, the second one-way switch 108 to close, the first one-way switch 107, the third one-way switch 109 to disconnect, and the second group of solar photovoltaic components 102 is connected to the capacitor group 103 103 charging, collecting the IV characteristic curve of the second group of solar photovoltaic modules 102 while charging. And calculate the current maximum output power of the component according to the measured curve.

(4A) Control the first one-way switch 107 to close, the second one-way switch 108 , the third one-way switch 109 , and the fourth one-way switch 110 to be off, and the capacitor bank 103 is discharged through the power resistor 104 .

(5A) Measure the coplanar radiation of the current component through the irradiance measurement module, measure the temperature of the backplane of the component and the ambient temperature through the first temperature measurement module, and read the current time. Steps (1)-(5) take approximately 200ms to complete.

(6A) Store all the data in the USB flash drive, and send it to the host computer through the 3G communication module.

(7A) Collect the electrolyte temperature of the battery, and execute the corresponding battery charging strategy according to the future weather conditions sent by the host computer.

(8A) The test platform is controlled by a cpu timer to perform steps (1A)-(7A) every five seconds. In this embodiment, the battery charging and discharging strategy is as follows:

(1) Divide all kinds of weather into four grades of ABCD. (A: sunny; B: cloudy to sunny, sunny to cloudy; C: cloudy, cloudy to cloudy, light rain, showers to cloudy; D: thunderstorms, showers to thunderstorms, heavy rain)

(2) Calculate the average irradiance and the average temperature of the module backplane under various weather conditions based on the weather station data of the previous year and the module backplane temperature.

(3) Estimate the power generation of the module from the average radiation and the temperature of the backplane of the module under various weather conditions. According to the weather conditions of the next week sent by the host computer, calculate the rechargeable capacity N of the components for the battery in the next week.

(4) Estimate the remaining capacity of the battery by measuring the open circuit voltage of the battery. Define the difference between the total capacity of the storage battery and the current capacity as M.

(5) Implement different battery charging strategies according to different N and M values, the steps are as follows:

1. If N<M, the control component works at the maximum power point and outputs the maximum power. The battery is charged with a constant current I=0.1C, and the temperature T of the electrolyte is collected synchronously. If T>40°C, stop charging, otherwise continue.

2. If M<N<2M, a.90Ah>M>=60Ah 1.M is charged with a constant current I=0.08C between 70Ah and 90Ah.

2.M is charged at rated voltage between 60Ah and 70Ah.

b.30Ah>M>=60Ah 1.M is charged with a constant current I=0.05C between 40Ah and 60Ah.

2.M is charged at rated voltage between 30Ah and 40Ah.

c.30Ah>M>=5Ah 1.M is charged with a constant current I=0.05C between 25Ah and 30Ah.

2. M is charged between 15Ah and 25Ah with a constant current I=0.03C.

3.M is charged at rated voltage between 5Ah and 15Ah.

d.M float charge at float voltage between 0Ah and 5Ah.

3. If N>2M, then 1. Charge with a constant current I=0.03C to increase the battery capacity by 10%M

2. Charge with a constant current I=0.08C to increase the battery capacity by 30%M

3. Charge at rated voltage to increase battery capacity by 30%M

4. Charge with a constant current I=0.03C to increase the battery capacity by 20%M

5. Float charge with float voltage

The online analysis method of the component power generation performance based on the outdoor test platform of the present invention comprises the following steps:

Use VB to write the design monitoring program on the remote control computer. After the data measured by the test platform is sent to the remote control computer through the 3G communication module, the power unit of the module is first converted into KWh, and the power of the module is divided with the temperature of the backplane of the module and the coplanar irradiance of the module at the same time. The temperature ranges from 10°C to 60°C every 5°C, and the coplanar radiation ranges from ⁰ to 1300W/ ^m2 every 100W/m2. After all the daily data are sent to the host computer, the first histogram of the power generation of the two components in each temperature range divided by temperature will be automatically generated, and the second histogram of the power generation of the two components in each radiation range divided by radiation will be automatically generated. graph, and a line graph of the power generation of the two components at various time points throughout the day. When there is one month's data in the database, three comparative analysis charts of the power generation of the two modules in the current month will be automatically generated. At the same time, various performance parameters of the components are displayed in real time on the monitoring interface of the remote control computer according to the measured data.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention will also have other functions without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. the outdoor test platform of a solar photovoltaic assembly, it is characterized in that, including accumulator, 3rd single-way switch and the first group of solar photovoltaic assembly being in series with the 3rd single-way switch one end, 4th single-way switch and the second group of solar photovoltaic assembly being in series with the 4th single-way switch one end, the charging control circuit plate that for control first group solar photovoltaic assembly and second group solar photovoltaic assembly accumulator be charged in parallel with accumulator, second single-way switch and the power resistor discharged for first group of solar photovoltaic assembly and the capacitance group of second group of solar photovoltaic assembly charging and the first single-way switch and confession the capacitance group that is in series with first single-way switch one end being in series with second single-way switch one end；Described second single-way switch and capacitance group are connected in parallel on the two ends of charging control circuit plate；Described 3rd single-way switch and first group of solar photovoltaic assembly are connected in parallel on the two ends of the second single-way switch and capacitance group；Described 4th single-way switch and second group of solar photovoltaic assembly are also connected in parallel on the two ends of the second single-way switch and capacitance group；Described first single-way switch and power resistor are connected in parallel on the two ends of capacitance group；

Described charging control circuit plate includes CPU module, the communication module being connected with CPU module, for measuring current first group of solar photovoltaic assembly and the irradiance measurement module of second group of coplanar irradiance of solar photovoltaic assembly, it is arranged in first group of solar photovoltaic assembly and second group of back panel of solar photovoltaic module and air for measuring first group of solar photovoltaic assembly and second group of back panel of solar photovoltaic module temperature and the first temperature-measuring module of ambient temperature, for measuring the second temperature-measuring module of battery liquid temperature and the real-time clock module being connected with CPU module and memory module；Described memory module is for storing the IV characteristic curve data of testing time, first group of solar photovoltaic assembly and second group of solar photovoltaic assembly, current first group of solar photovoltaic assembly and second group of coplanar irradiance data of solar photovoltaic assembly, first group of solar photovoltaic assembly and second group of back panel of solar photovoltaic module temperature and ambient temperature data；Described irradiance measurement module, the first temperature-measuring module and the outfan of the second temperature-measuring module are connected with the input of CPU module；Described communication module is connected with host computer；

Described CPU module realizes first group of solar photovoltaic assembly and the handover measurement of second group of solar photovoltaic assembly by controlling the first single-way switch, the second single-way switch, the 3rd single-way switch and the 4th single-way switch break-make, gather the electrolyte temperature of accumulator simultaneously, and according to the future weather situation that described host computer is sent, perform corresponding accumulator charging strategy and accumulator is charged；

The future weather situation that test platform is sent according to host computer, performs corresponding accumulator charging strategy, and it is as follows that accumulator charging strategy implements step:

All kinds of weather are divided into tetra-grades of ABCD by step (1)；Wherein, A: fine；B: cloudy turn to fine, clear to cloudy；C: cloudy, cloudy turn to overcast, light rain, and shower is turned out cloudy；D: thunder shower, shower turns thunder shower, heavy rain；

Step (2) is according to the weather station data of the previous year, and first group of solar photovoltaic assembly and second group of back panel of solar photovoltaic module thermometer calculate the average irradiance under all kinds of weather and first group of solar photovoltaic assembly and the mean temperature of second group of back panel of solar photovoltaic module；

Step (3) by the average irradiance under all kinds of weather and first group of solar photovoltaic assembly and second group of back panel of solar photovoltaic module temperature, estimates each first group of solar photovoltaic assembly and the second group of solar photovoltaic assembly generated energy under all kinds of weather；Then the weather condition in one week future sent according to described host computer, can calculate following one week first group of solar photovoltaic assembly and second group of solar photovoltaic assembly the filled capacity N to accumulator；

Step (4), by measuring the open-circuit voltage of described accumulator, estimates the residual capacity of accumulator, and the total capacity of definition accumulator is M with the difference of current capacities；

Step (5) performs different accumulator charging strategy according to different N with M values, and strategy is as follows:

If step 1. N < M, controls current first group of solar photovoltaic assembly and second group of solar photovoltaic assembly is operated at peak power output point, Maximum Power Output；Accumulator with electric current I=0.1C constant-current charge, temperature T of synchronous acquisition electrolyte, if T > 40 DEG C; would stop charging, otherwise continue charging；

If step 2. M < N < 2M,

A.90Ah > M >=60Ah

A1.M is between 70Ah and 90Ah, and accumulator is charged with constant current I=0.08C；

A2.M is between 60Ah and 70Ah, and accumulator is charged with rated voltage；

B.60Ah > M >=30Ah

B1.M is between 40Ah and 60Ah, and accumulator is charged with constant current I=0.05C；

B2.M is between 30Ah and 40Ah, and accumulator is charged with rated voltage；

C.30Ah > M >=5Ah

C1.M is between 25Ah and 30Ah, and accumulator is charged with constant current I=0.05C；

C2.M is between 15Ah and 25Ah, and accumulator is charged with constant current I=0.03C；

C3.M is between 5Ah and 15Ah, and accumulator is charged with rated voltage；

D.M is between 0Ah and 5Ah, then accumulator carries out floating charge with float charge voltage；

If step 3. N > 2M, then

3.1. accumulator is charged with constant current I=0.03C, makes accumulator capacity increase 10%M；

3.2. accumulator is charged with constant current I=0.08C, makes accumulator capacity increase 30%M；

3.3. accumulator is charged with rated voltage, makes accumulator capacity increase 30%M；

3.4. accumulator is charged with constant current I=0.03C, makes accumulator capacity increase 20%M；

3.5. accumulator carries out floating charge with float charge voltage.

The outdoor test platform of solar photovoltaic assembly the most according to claim 1, it is characterized in that, in step (5), the determination method of first group of solar photovoltaic assembly peak power is as follows: close by controlling described 3rd single-way switch and the second single-way switch, described first single-way switch and the 4th single-way switch disconnect, the most described first group of solar photovoltaic assembly is connected with capacitance group and charges capacitance group, the IV characteristic curve of described first group of solar photovoltaic assembly is gathered while charging, first group of current peak power output of solar photovoltaic assembly is calculated according to this curve；

The determination method of second group of solar photovoltaic assembly peak power is as follows: close by controlling described 4th single-way switch and the second single-way switch, described first single-way switch and the 3rd single-way switch disconnect, the most described second group of solar photovoltaic assembly is connected with capacitance group and charges capacitance group, gather the IV characteristic curve of described second group of solar photovoltaic assembly while charging, calculate second group of current peak power output of solar photovoltaic assembly according to this curve.

The outdoor test platform of solar photovoltaic assembly the most according to claim 2, it is characterised in that

Closing by controlling described first single-way switch, the second single-way switch, the 3rd single-way switch and the 4th single-way switch disconnect, and described capacitance group is discharged by power resistor.

4. according to the outdoor test platform of the solar photovoltaic assembly described in claims 1 to 3 any one, it is characterised in that described CPU module uses the dsp chip TMS320F28035 that TI company produces.

5. according to the outdoor test platform of the solar photovoltaic assembly described in claims 1 to 3 any one, it is characterised in that described irradiance measurement module uses the silicon irradiance sensor that IMT Solar company produces.

6., according to the outdoor test platform of the solar photovoltaic assembly described in claims 1 to 3 any one, it is characterised in that described first temperature-measuring module uses temperature sensor, described temperature sensing implement body uses multiple Pt100 platinum resistance thermometer sensor,.

7. assembly power generation performance on-line analysis based on the outdoor test platform described in claims 1 to 3 any one, it is characterised in that include following step:

(S1) described the surveyed data of outdoor test platform are sent to remote control computer in real time by communication module, and leave in data base；One group of data surveyed by every five seconds of described outdoor test platform, moment value when often group data include gathering data；The IV characteristic curve data of first group of solar photovoltaic assembly and second group of solar photovoltaic assembly, the IV characteristic curve of every piece of first group of solar photovoltaic assembly and second group of solar photovoltaic assembly comprises magnitude of voltage and the current value of 256 component operation points；The irradiation value that current first group of solar photovoltaic assembly and second group of coplanar irradiation instrument of solar photovoltaic assembly are measured；The temperature value of two temperature test points of first group of solar photovoltaic assembly and second group of back panel of solar photovoltaic module and the temperature value of environment；Performance number at first group of solar photovoltaic assembly and the current short-circuit current value of second group of solar photovoltaic assembly, open-circuit voltage values, maximum power point and current/voltage value；

(S2) power unit of first group of solar photovoltaic assembly and second group of solar photovoltaic assembly is converted into kWh, described outdoor test platform surveys one group of data in every five seconds, calculate first group of solar photovoltaic assembly and second group of solar photovoltaic assembly generated energy of every five seconds, mutually first group of solar photovoltaic assembly the most in the same time and second group of back panel of solar photovoltaic module temperature and first group of solar photovoltaic assembly and second group of coplanar irradiance of solar photovoltaic assembly are divided, calculate first group of solar photovoltaic assembly and the second group of solar photovoltaic assembly gross generation in each temperature range and irradiation interval；

(S3) by after described in every day, the surveyed data of outdoor test platform are all sent to remote control computer, then automatically generate first first group of solar photovoltaic assembly divided by temperature and the second group of solar photovoltaic assembly block diagram at each temperature range generated energy, press first group of solar photovoltaic assembly that irradiance divides and second group of solar photovoltaic assembly at the interval generated energy block diagram of each irradiation for second, and first group of solar photovoltaic assembly and the broken line graph of second group of solar photovoltaic assembly a whole day each time point generated energy；

(S4) when described data base has the data of month, then automatically generate the relative analysis figure of of that month first group of solar photovoltaic assembly and second group of solar photovoltaic assembly generated energy, and show first group of solar photovoltaic assembly and the various performance parameters of second group of solar photovoltaic assembly in real time according to surveyed data.

8. assembly power generation performance on-line analysis based on the outdoor test platform described in claim 7, it is characterised in that

In step (S2), first group of solar photovoltaic assembly and second group of back panel of solar photovoltaic module temperature are an interval from 10 DEG C to 60 DEG C every 5 DEG C, and first group of solar photovoltaic assembly and second group of coplanar irradiation of solar photovoltaic assembly are from 0 to 1300W/m²Every 100W/m²It it is an interval.