CN105743439B - The detection method and relevant apparatus of photovoltaic cell group string operating parameter - Google Patents
The detection method and relevant apparatus of photovoltaic cell group string operating parameter Download PDFInfo
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Abstract
This application involves photovoltaic cell technical fields, disclose the detection method and relevant apparatus of a kind of photovoltaic cell group string operating parameter, it is instructed by being sent to each inverter, to control each inverter in the same time, using the operating parameter for the photovoltaic cell group string that the acquisition of same detection parameters is connect with itself, in this way, traditional serial sensing is changed to parallel detection, detection cycle can not only be substantially reduced, improve execution efficiency, and it is effective comparative to can also ensure that the detection data of different photovoltaic cell group strings has, guarantee that data consistency is not affected by environment.
Description
Technical field
This application involves photovoltaic cell technical fields, the in particular to detection method and phase of photovoltaic cell group string operating parameter
Close device.
Background technique
Photovoltaic cell component is the basic unit for realizing photoelectric conversion, and solar energy is converted to direct current energy.Practical light
Generally by multiple photovoltaic cell components photovoltaic cell group string in series in overhead utility application, then the groups that one or more is in parallel
It is series-connected to gird-connected inverter, direct current is converted to by alternating current by inverter and is transported on AC network.
Under normal circumstances, the characteristics of output power of photovoltaic cell component is by the oneself state of battery component, and ambient light is according to strong
Degree, the factors such as environment temperature determine.Battery component is at work, it may appear that due to internal element failure, light induced attenuation characteristic etc.
Reason causes output power to reduce.Since component is generally operational in series-parallel state, these parts, a other component powers decline
Subtracting or declining will lead to group the output power of string and is greatly lowered, and lead to the lower power production in entire power station in turn.Therefore, it needs
Discovery is detected in time and investigation breaks down or the component under abnormal operation, and is repaired or is rectified and improved, and protected
Barrier system generated energy.In general, it in troubleshooting procedure, needs to be checked as unit of group string.
But in large-sized photovoltaic power station, the quantity of photovoltaic cell group string is very more, and diffusional area is wide, and investigation range is wanted
Cover entire photovoltaic plant, need manually to detect one by one, ambient condition is changing always in the detection process of field, so not only without
Method guarantees that different groups of strings are detected under the conditions of same illumination and temperature, cannot effectively be compared to different groups of strings, and
Detection limit is very huge, and detection cycle is very long, and testing cost is high.
Summary of the invention
The embodiment of the present application provides the detection method and relevant apparatus of a kind of photovoltaic cell group string operating parameter, to solve
Photovoltaic cell group string detection cycle is long in photovoltaic plant and the problem of can not effectively comparing.
Specific technical solution provided by the embodiments of the present application is as follows:
In a first aspect, providing a kind of detection method of photovoltaic cell group string operating parameter, comprising: the power station in photovoltaic plant
Monitoring system is to each inverter connecting with Power Station Monitored Control System transmission group string detection instruction respectively, each inversion
Photovoltaic cell group string to be detected is connected separately on device, described group of string detection instruction is used to indicate each inverter:
The identical time, according to identical detection parameters, detect the operating parameter for the photovoltaic cell group string connecting with itself；The power station
Monitoring system receives the testing result of the operating parameter for the photovoltaic cell group string of each inverter fed connecting with itself,
And the testing result is analyzed and processed.
In this way, shortening photovoltaic cell group string in photovoltaic plant by the way that traditional serial sensing is changed to parallel detection
Detection cycle, substantially increase execution efficiency.
With reference to first aspect, in the first possible implementation of the first aspect, described group of string detection instruction includes
Time synchronization instruction and operational parameter detection instruction；
The time synchronization instruction, which is used to indicate between each inverter and the Power Station Monitored Control System, realizes the time
It is synchronous；
It include the detection parameters in the operating parameter instruction, the operating parameter instruction is in each inversion
After realizing time synchronization between device and the Power Station Monitored Control System, indicate that each inverter is joined according to the detection respectively
The operating parameter for the photovoltaic cell group string that number detection is connect with itself.
In this way, issuing identical detection parameters to each inverter by Power Station Monitored Control System, indicate that each inverter is pressed
According to the operating parameter of identical detection parameters detection photovoltaic battery pack string, it is ensured that data consistency is not affected by environment, and
It can guarantee that the data of each inverter acquisition have comparability, that is, can guarantee the different photovoltaic cell group strings of detection
Operating parameter have effectively it is comparative.
With reference to first aspect or the first possible implementation of first aspect, second in first aspect are possible
In implementation, the detection parameters include: the detection starting time, detect initial value, the stop value of voltage；The detection voltage
Initial value be peak in the open-circuit voltage for the photovoltaic cell group string that each inverter is separately connected or be setting
Value；The stop value of the detection voltage is 0 or is setting value.
The possible implementation of second with reference to first aspect, in the third possible implementation of first aspect
In, the detection parameters further include detecting the scanning step of voltage；The Power Station Monitored Control System is according to as described in determining under type
It detects the scanning step of voltage: the initial value of the detection voltage is divided into intensive section to the voltage range between stop value
With sparse section；The scanning step in the intensive section and the sparse section is determined respectively, wherein is swept in the intensive section
Retouch the scanning step that step-length is less than the sparse section.
In this way, by the selection in the intensive section to detection voltage, and the setting of the scanning step to intensive section can be with
The voltage range high to attention rate intensively takes electrical voltage point, so that the curve finally drawn according to data such as the voltages of acquisition has more
Intentional property, can more restore real curve.
The third possible implementation with reference to first aspect, in the 4th kind of possible implementation of first aspect
In, the initial value of the detection voltage is divided into intensive section to the voltage range between stop value by the Power Station Monitored Control System
With sparse section, specifically include: peak in open-circuit voltage of the Power Station Monitored Control System based on each inverter or
Setting value described in person, determines reference voltage value；The reference voltage value approaches the photovoltaic electric that each inverter is separately connected
The corresponding voltage value of maximum power point of pond group string；On the basis of the reference voltage value, choose and the reference voltage value
Voltage difference absolute value be given threshold two voltage values be used as the first voltage value and second voltage value, the first voltage value with
The second voltage value is respectively positioned between the initial value and the stop value, by the first voltage value and the second voltage
Voltage range between value is determined as the intensive section；By the voltage model between the first voltage value and the initial value
It encloses and the range between the second voltage value and the stop value is determined as the sparse section.
With reference to first aspect with the first any one into the 4th kind of possible implementation of first aspect,
In 5th kind of possible implementation of one side, the Power Station Monitored Control System connects each inversion by communication device
Device, and the Power Station Monitored Control System sends described group of string detection to each inverter by the communication device respectively and refers to
It enables.
Second aspect provides a kind of detection method of photovoltaic cell group string operating parameter, comprising:
Inverter in photovoltaic plant receives the group string detection instruction that Power Station Monitored Control System is sent, described group of string detection instruction
The each inverter connecting with the Power Station Monitored Control System is used to indicate to join at the same time, according to identical detection respectively
Number detects the operating parameter for the photovoltaic cell group string connecting with itself；
The operating parameter for the photovoltaic cell group string that the inverter is connect according to described group of string detection instruction detection with itself,
And it will test result and feed back to the Power Station Monitored Control System.
In this way, shortening photovoltaic cell group string in photovoltaic plant by the way that traditional serial sensing is changed to parallel detection
Detection cycle, substantially increase execution efficiency.
In conjunction with second aspect, in the first possible implementation of the second aspect, described group of string detection instruction includes
Time synchronization instruction and operational parameter detection instruction；
It include the detection parameters in the operating parameter instruction, the detection parameters include: detection starting time, detection
The initial value of voltage, stop value；The initial value of the detection voltage is the photovoltaic cell group that each inverter is separately connected
Peak in the open-circuit voltage of string is setting value；The stop value of the detection voltage is 0 or is setting value.
In conjunction with the first possible implementation of second aspect, in second of possible implementation of second aspect
In, the operating parameter for the photovoltaic cell group string that the inverter is connect according to described group of string detection instruction detection with itself, comprising:
The inverter is instructed according to the time synchronization, realizes time synchronization between the Power Station Monitored Control System；And according to described
The detection parameters for including in operational parameter detection instruction, detect the operating parameter for the photovoltaic cell group string connecting with itself.
In conjunction with second of possible implementation of second aspect, in the third possible implementation of second aspect
In, the detection parameters further include detecting the scanning step in the intensive section of voltage and sweeping for the sparse section for detecting voltage
Step-length is retouched, the scanning step in the intensive section is less than the scanning step in the sparse section；It is described according to the operating parameter
The operating parameter for the photovoltaic cell group string that the detection parameters detection for including in detection instruction is connect with itself, specifically includes:
When reaching the detection starting time, since the initial value of the detection voltage, according to described in scanning step detection
Operating parameter, the stop value to the detection voltage terminate.
In conjunction with second of possible implementation of second aspect, in the 4th kind of possible implementation of second aspect
In, it is described to detect the photovoltaic cell group connecting with itself according to the detection parameters for including in operational parameter detection instruction
The operating parameter of string, specifically includes: when reaching the detection starting time, since the initial value of the detection voltage, pressing
The operating parameter is detected according to default scanning step, the stop value to the detection voltage terminates；The default scanning step is
The pre-set uniform scanning step-length of inverter, or be the pre-set non-homogeneous scanning step of the inverter,
In, the non-homogeneous scanning step includes the step-length within the scope of step-length and second voltage in first voltage range, first voltage
Step-length in range is less than the step-length within the scope of second voltage, and first voltage range and second voltage range are the inverter root
It is determined according to empirical value.
Here first voltage range is about the region near 80% position of photovoltaic cell group string open-circuit voltage, and second
Voltage range is the region in the scanning voltage range of the photovoltaic cell group string in addition to first voltage range.
In conjunction with any one of the first of second aspect and second aspect into the 4th kind of possible implementation,
In 5th kind of possible implementation of two aspects, the inverter is connect by communication device with the Power Station Monitored Control System,
The inverter receives the described group of string detection instruction that the Power Station Monitored Control System is sent by the communication device, and passes through
The communication device feeds back the testing result to the Power Station Monitored Control System.
The third aspect, provides the Power Station Monitored Control System in a kind of photovoltaic plant, the Power Station Monitored Control System have realize it is above-mentioned
The first of first aspect and first aspect monitoring power station in any method design into the 5th kind of possible implementation
The function of system action.The function can also execute corresponding software realization by hardware realization by hardware.It is described
Hardware or software include one or more modules corresponding with above-mentioned function.
Fourth aspect, provides the inverter in a kind of photovoltaic plant, which, which has, realizes above-mentioned second aspect and the
The function of the first of two aspects inverter behavior in any method design into the 5th kind of possible implementation.It is described
Function can also execute corresponding software realization by hardware realization by hardware.The hardware or software include one
Or multiple modules corresponding with above-mentioned function.
5th aspect, provides the Power Station Monitored Control System in a kind of photovoltaic plant, and the structure of the Power Station Monitored Control System includes receiving
Send out device and processor, the processor for calling batch processing so that the Power Station Monitored Control System execute such as first aspect and
Method described in any one of the first of first aspect into the 5th kind of possible implementation.
6th aspect, provides the inverter in a kind of photovoltaic plant, and the structure of the inverter includes transceiver and processor,
The processor is for calling batch processing, so that the inverter is executed such as the first of second aspect and second aspect to the
Any method in five kinds of possible implementations.
7th aspect, provides a kind of computer storage medium, for being stored as in photovoltaic plant described in above-mentioned aspect
Power Station Monitored Control System used in computer software instructions, it includes for executing program designed by above-mentioned aspect.
Eighth aspect provides a kind of computer storage medium, for being stored as in photovoltaic plant described in above-mentioned aspect
Inverters computer software instructions, it includes for executing program designed by above-mentioned aspect.
Traditional serial sensing is changed to parallel detection by scheme provided by the present application, can not only substantially reduce large-scale light
In the period that photovoltaic battery pack string is detected in overhead utility, execution efficiency is improved, and can also ensure that data consistency not by ring
Border influences, and it is effective comparative to guarantee that the detection data of different photovoltaic cell group strings has, can faster positioning failure, effectively
Improve the efficiency that a large amount of photovoltaic cell group strings are checked in large-sized photovoltaic power station.
Detailed description of the invention
Fig. 1 is networking schematic diagram in the embodiment of the present application；
Fig. 2 is the detection method flow chart of photovoltaic cell group string operating parameter in the embodiment of the present application；
Fig. 3 is the exemplary diagram of the I-V curve of 6 groups of photovoltaic cell group strings in the embodiment of the present application；
Fig. 4 is one of the structure chart of Power Station Monitored Control System in the embodiment of the present application in photovoltaic plant；
Fig. 5 is one of the structure chart of inverter in the embodiment of the present application in photovoltaic plant；
Fig. 6 is the two of the structure chart of the Power Station Monitored Control System in the embodiment of the present application in photovoltaic plant；
Fig. 7 is the two of the structure chart of the inverter in the embodiment of the present application in photovoltaic plant.
Specific embodiment
In order to keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with attached drawing to the application make into
It is described in detail to one step, it is clear that described embodiments are only a part of embodiments of the present application, rather than whole implementation
Example.Based on the embodiment in the application, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall in the protection scope of this application.
In view of in large-sized photovoltaic power station, manually this investigation mode bring detection of detection photovoltaic battery pack string is all one by one
Phase is very long, and testing cost is high, and the comparative not high problem of testing result, the embodiment of the present application provides a kind of photovoltaic cell group string
The detection method of operating parameter, by each inverter send instruct, come control each inverter in the same time, using same
The operating parameter for the photovoltaic cell group string that the detection parameters of sample go acquisition to connect with itself respectively, in this way, by traditional serial inspection
Survey is changed to parallel detection, can not only substantially reduce detection cycle, improves execution efficiency, and can also ensure that different photovoltaics
The detection data of battery pack string has effective comparative, guarantees that data consistency is not affected by environment.
Method provided by the embodiments of the present application can be adapted for the scene of any detection photovoltaic battery pack string operating parameter, lift
For example, photovoltaic plant is generally bigger, and multiple power generation submatrixs, the output of a power generation submatrix can be divided into a photovoltaic plant
Power is usually 1Mw, comprises about 240 photovoltaic cell group strings.Be connected on usual inverter a photovoltaic cell group string or
Person is connected with multiple photovoltaic cell group strings.
Fig. 1 show the embodiment of the present application networking schematic diagram, if including Power Station Monitored Control System 101, communication device 102 and
Dry inverter 103.As shown, being connected with photovoltaic cell group string to be detected on each inverter 103；Communication device
102 can be for example data collector, and one end between each inverter 103 by communication interface for being connect, the other end
For docking Power Station Monitored Control System 101, communication device 102 is responsible for the data transmission for acquiring inverter to Power Station Monitored Control System
101；Power Station Monitored Control System 101 is used to send by communication device 102 to each inverter 103 and instruct, and, it will receive
Communication device 102 send data after, data are analyzed and processed.
The application preferred embodiment is described in detail with reference to the accompanying drawing.
It is executing subject, photovoltaic based on Power Station Monitored Control System in the embodiment of the present application based on networking structure shown in FIG. 1
The rough process of detection method of battery pack string operating parameter are as follows:
Power Station Monitored Control System in photovoltaic plant is to each inverter transmission group string connecting with the Power Station Monitored Control System
Detection instruction is connected separately with photovoltaic cell group string to be detected on each inverter, and described group of string detection instruction is used for
Indicate each inverter: the photovoltaic cell group connecting at the same time, according to identical detection parameters, detection with itself
The operating parameter of string；
The Power Station Monitored Control System receives the fortune for the photovoltaic cell group string of each inverter fed connecting with itself
The testing result of row parameter, and the testing result is analyzed and processed.
It is executing subject based on wherein any one inverter in each inverter, photovoltaic cell group string operating parameter
The rough process of detection method are as follows:
Inverter in photovoltaic plant receives the group string detection instruction that Power Station Monitored Control System is sent, described group of string detection instruction
The each inverter connecting with the Power Station Monitored Control System is used to indicate to join at the same time, according to identical detection respectively
Number detects the operating parameter for the photovoltaic cell group string connecting with itself；
The operating parameter for the photovoltaic cell group string that the inverter is connect according to described group of string detection instruction detection with itself,
And it will test result and feed back to the Power Station Monitored Control System.
As shown in fig.2, the substantially process of the detection method below based on above-mentioned photovoltaic cell group string operating parameter, according to
Interactive process between Power Station Monitored Control System and inverter, the detection to photovoltaic cell group string operating parameter in the embodiment of the present application
The detailed process of method is introduced.
Step 201: Power Station Monitored Control System in photovoltaic plant is to each inverter connecting with the Power Station Monitored Control System
Sending time synchronic command respectively；
Wherein, the time synchronization instruction, which is used to indicate between each inverter and the Power Station Monitored Control System, realizes
Time synchronization is connected separately with photovoltaic cell group string to be detected on each inverter.
It is to be understood that Power Station Monitored Control System issues time synchronization instruction to each inverter by the way of broadcast.
Preferably, Power Station Monitored Control System is to realize to connect with each inverter by communication device, Power Station Monitored Control System
Sending time synchronic command is distinguished to each inverter by communication device.Also, time synchronization instruction is also used to indicate to communicate
Device is also realized realizes time synchronization between Power Station Monitored Control System.
Step 202: the inverter in photovoltaic plant receives the time synchronization instruction that Power Station Monitored Control System is sent, and according to institute
It states and realizes time synchronization between time synchronization instruction and the Power Station Monitored Control System.
That is, update local zone time, realization are supervised with power station after each inverter receives time synchronization instruction
Time synchronization between control system.
Step 203: Power Station Monitored Control System realizes that the time is same between each inverter and the Power Station Monitored Control System
After step, operational parameter detection instruction (may be simply referred to as detection instruction), the operation ginseng are sent respectively to each inverter
Comprising the detection parameters for detecting photovoltaic battery pack string operating parameter in number detection instruction, the operational parameter detection instruction is used
Join in the operation for the photovoltaic cell group string that instruction each inverter is connect according to detection parameters detection with itself respectively
Number.
The operating parameter includes voltage and current；
The detection parameters include: the detection starting time, detect initial value, the stop value of voltage；The detection voltage
Initial value or stop value be peak in the open-circuit voltage for the photovoltaic cell group string that each inverter is separately connected or
For setting value；The stop value of the detection voltage is 0 or is setting value.
For example, the peak in the open-circuit voltage for the photovoltaic cell group string that each inverter is separately connected is 850V, will examine
The initial value for surveying voltage is set as 850V, and the stop value that will test voltage is set as 0V, then inverter can be according to monitoring power station system
The detection parameters that system is sent, voltage range of the scanning voltage range between 850V~0V.It can also be will test the starting of voltage
Value is set as a setting value, for example, being set as 900V, the stop value that will test voltage is set as 0V, then inverter can basis
The detection parameters that Power Station Monitored Control System is sent, voltage range of the scanning voltage range between 900V~0V.
Wherein, peak and the equal root of setting value in the open-circuit voltage for the photovoltaic cell group string that each inverter is separately connected
It is obtained accordingly toward detection experience.
The determination of scanning step about detection voltage can be arranged equal between the initial value and stop value of detection voltage
Even scanning step；Preferably, can also be by the way of in the embodiment of the present application.
In the embodiment of the present application, Power Station Monitored Control System further includes detecting voltage to the detection parameters that each inverter issues
Scanning step.
The Power Station Monitored Control System is according to the scanning step for detecting voltage as described in determining under type:
The initial value of the detection voltage is divided into intensive section and sparse section to the voltage range between stop value；
The scanning step in the intensive section and the sparse section is determined respectively, wherein the scanning in the intensive section
Step-length is less than the scanning step in the sparse section.
Wherein, intensive section can arbitrarily determine according to demand, and in general, intensive section is selected as maximum power point
Near corresponding voltage value.
Specifically, the peak or described in open-circuit voltage of the Power Station Monitored Control System based on each inverter
Setting value determines reference voltage value；The reference voltage value approaches the photovoltaic cell group string that each inverter is separately connected
The corresponding voltage value of maximum power point；
Above-mentioned maximum power point refers to the value for the maximum power that photovoltaic cell group string can obtain, in general, each inverse
The position for becoming the corresponding voltage value of maximum power point of the photovoltaic cell group string acquisition of device connection is very close, almost the same, this Shen
Please in, due to being the unified detection parameters issued to each inverter of Power Station Monitored Control System, the corresponding electricity of maximum power point
Pressure value is consistent.The corresponding voltage value of maximum power point, that is, above-mentioned reference voltage value, the method for determination of reference voltage value are root
According to experience, take 80% or 85% point of the initial value (or stop value) for the detection voltage for including in detection parameters as ginseng
Examine voltage value, that is, in the open-circuit voltage for the photovoltaic cell group string for taking each inverter to be separately connected peak (or
Setting value) 80% or 85% point be worth as the reference voltage.
On the basis of the reference voltage value, choosing with the voltage difference absolute value of the reference voltage value is given threshold
As the first voltage value and second voltage value, the first voltage value and the second voltage value are respectively positioned on described two voltage values
Between initial value and the stop value, the voltage range between the first voltage value and the second voltage value is determined as institute
State intensive section；By between the first voltage value and the initial value voltage range and the second voltage value and institute
It states the range between stop value and is determined as the sparse section.
For example, the scanning range of the detection voltage of above-mentioned determination is 900V~0V, then reference voltage value is 900V × 80%
=720V, it is 700V that the first voltage value is chosen near 720V, and selection second voltage value is 740V, then between 700V~740V
Voltage range is intensive section, and the region between 0V~700V and 740V~900V is sparse section.
The scanning step in intensive section is less than the scanning step in sparse section, for example, the scanning between 700V~740V walks
A length of 3V, scanning step is 10V between 0V~700V and 740V~900V.Certainly, intensive section (or sparse section) is swept
Step-length is retouched can be equal or to differ.
Step 204: after the inverter receives the operational parameter detection instruction that the Power Station Monitored Control System is sent, according to institute
The detection parameters for including in operational parameter detection instruction are stated, the operating parameter for the photovoltaic cell group string connecting with itself is detected.
Specifically, if including the scanning step of test voltage in detection parameters, the inverter starts in the detection
When time reaches, since the initial value of the detection voltage, the operating parameter is detected according to the scanning step, described in
The stop value of detection voltage terminates；
If not including the scanning step of test voltage in detection parameters, the inverter is arrived in the detection starting time
Up to when, since the initial value of the detection voltage, detect the operating parameter according to default scanning step, it is electric to the detection
The stop value of pressure terminates；
The default scanning step is the pre-set uniform scanning step-length of the inverter, or pre- for the inverter
The non-homogeneous scanning step being first arranged, wherein the non-homogeneous scanning step includes the step-length and second in first voltage range
Step-length in voltage range, the step-length in first voltage range are less than the step-length within the scope of second voltage, first voltage range and
Second voltage range is that the inverter determines based on experience value.
It is, the scanning step of test voltage is in addition to being scanned it on the basis of the value that issues according to Power Station Monitored Control System
Outside, inverter itself can also be configured scanning step in default setting, can be set to even step sizes, can also be
Nearby intensive step-length is arranged in some specific voltage value, and sparse step-length is arranged in remaining voltage range.It is above-mentioned some
Voltage value is generally 80% value of the open-circuit voltage of photovoltaic cell group string, empirically determined, or setting specific one
A value.
In general, the operating parameter for detecting a photovoltaic cell group string includes one group for detecting the photovoltaic cell group string
The corresponding current value of each of voltage value and this group of voltage value voltage value.
Since the starting time of each inverter execution detection, the initial value for detecting voltage, stop value, scanning step are equal
It is identical, accordingly, it is believed that the operating parameter of each inverter detection acquires under the conditions of same illumination, temperature, detection knot
Fruit factor affected by environment is smaller, and the testing result of any two inverter have it is higher comparative, can be more effective
Positioning failure.
Step 205: the testing result of the operating parameter is fed back to the Power Station Monitored Control System by the inverter.
Step 206: Power Station Monitored Control System receives the photovoltaic cell group string of each inverter fed connecting with itself
Operating parameter testing result, and the testing result is analyzed and processed.
Power Station Monitored Control System is according to the voltage value of the photovoltaic cell group string of each inverter fed connecting with itself and right
The current value answered can calculate open-circuit voltage values, short-circuit current value, the maximum power value etc. of corresponding photovoltaic cell group string, and
Current -voltage curve (can be described as I-V curve) can be drawn.
Assuming that have detected the operating parameter of 6 groups of photovoltaic cell group strings altogether by each inverter, Power Station Monitored Control System according to
Data that each inverter is sent and the I-V curve drawn is as shown in Figure 3.
The horizontal axis of Fig. 3 represents voltage value, and unit is volt V, and the longitudinal axis represents current value, and unit is ampere A.6 curves point
The I-V curve drawn according to the operating parameter of 6 groups of photovoltaic cell group strings of detection is not represented, between the vertical line in Fig. 3
Density degree is used to indicate the value density degree of detection voltage, and as can be seen from Figure 3, Power Station Monitored Control System is handed down to each inverter
Detection parameters in, the initial value for detecting voltage is 850V or so, and stop value 0V detects the value of voltage in I-V curve
Inflection point nearby compares comparatively dense.Due to each inverter acquire 6 groups of photovoltaic cell group strings operating parameter when use it is same
Detection parameters start in the same time and detect, and the scanning range for detecting voltage is consistent, preferably, it is also possible that inspection
The scanning step for surveying voltage is consistent, it may be considered that:
One, when acquiring the operating parameter of this 6 groups of photovoltaic cell group strings, locating for the environmental conditions one such as illumination, temperature
It causes, therefore, the operating parameter of this 6 groups of photovoltaic cell group strings is not affected by environment, with uniformity.
Secondly, due to scanning range it is consistent with scanning step, this 6 groups of photovoltaic cell group strings select during acquiring data
The electrical voltage point selected is consistent, therefore, when analyzing data, when the data of this 6 groups of photovoltaic cell group strings are adopted to same voltage value, no
The value of other operating parameters such as electric current, power with group string is true measurement gained, rather than according to given data smoothed curve
During predict gained, the difference of other operating parameters such as electric current, power between different groups of strings of comparison can be more advantageous in this way
Different, comparison result is more authentic and valid.
Based on the same inventive concept, as shown in figure 4, the power station prison in a kind of photovoltaic plant has also been devised in the embodiment of the present application
Control system 400, comprising: transmission unit 401, receiving unit 402 and processing unit 403, in which:
Transmission unit 401, for transmission group string to be examined respectively to each inverter connecting with the Power Station Monitored Control System 400
Instruction is surveyed, photovoltaic cell group string to be detected is connected separately on each inverter, described group of string detection instruction is for referring to
Show each inverter: the photovoltaic cell group string connecting at the same time, according to identical detection parameters, detection with itself
Operating parameter；
Receiving unit 402, the fortune of the photovoltaic cell group string being connect with itself for receiving each inverter fed
The testing result of row parameter；
Processing unit 403, for being tied to the detection after the receiving unit 402 receives the testing result
Fruit is analyzed and processed.
Optionally, the operating parameter includes voltage and current；Described group of string detection instruction include time synchronization instruction and
Operational parameter detection instruction；
It include the detection parameters in the operating parameter instruction, the operating parameter instruction is in each inversion
After realizing time synchronization between device and the Power Station Monitored Control System, indicate that each inverter is joined according to the detection respectively
The operating parameter for the photovoltaic cell group string that number detection is connect with itself；
The detection parameters include: the detection starting time, detect initial value, the stop value of voltage；The detection voltage
Initial value is peak in the open-circuit voltage for the photovoltaic cell group string that each inverter is separately connected or is setting value；
The stop value of the detection voltage is 0 or is setting value.
Optionally, the detection parameters further include detecting the scanning step of voltage；
The Power Station Monitored Control System 400 further includes determination unit 404；
The determination unit 404 is specifically used for:
The initial value of the detection voltage is divided into intensive section and sparse section to the voltage range between stop value；
The scanning step in the intensive section and the sparse section is determined respectively, wherein the scanning in the intensive section
Step-length is less than the scanning step in the sparse section.
Optionally, the determination unit 404 is specifically used for:
Peak or the setting value in open-circuit voltage based on each inverter, determine reference voltage value；
The reference voltage value approaches the corresponding voltage of maximum power point for the photovoltaic cell group string that each inverter is separately connected
Value；
On the basis of the reference voltage value, choosing with the voltage difference absolute value of the reference voltage value is given threshold
As the first voltage value and second voltage value, the first voltage value and the second voltage value are respectively positioned on described two voltage values
Between initial value and the stop value, the voltage range between the first voltage value and the second voltage value is determined as institute
State intensive section；By between the first voltage value and the initial value voltage range and the second voltage value and institute
It states the range between stop value and is determined as the sparse section.
Optionally, the Power Station Monitored Control System 400 connects each inverter by communication device；
The transmission unit 401 is specifically used for, sent respectively by the communication device to each inverter described in
Group string detection instruction.
Based on the same inventive concept, as shown in fig.5, the embodiment of the present application also provides the inverter in a kind of photovoltaic plant
500, including receiving unit 501, detection unit 502 and transmission unit 503.Wherein:
Receiving unit 501, for receiving the group string detection instruction of Power Station Monitored Control System transmission, described group of string detection instruction is used
In each inverter for being connect with the Power Station Monitored Control System of instruction distinguish at the same time, according to identical detection parameters,
Detect the operating parameter for the photovoltaic cell group string connecting with itself；
Detection unit 502, for connecting according to the received described group of string detection instruction detection of the receiving unit 501 with itself
The operating parameter of the photovoltaic cell group string connect；
Transmission unit 503, the testing result for the detection unit 502 detection feed back to the Power Station Monitored Control System.
Optionally, the operating parameter includes voltage and current；
Described group of string detection instruction includes time synchronization instruction and operational parameter detection instruction；In the operating parameter instruction
Comprising the detection parameters, the detection parameters include: the detection starting time, detect initial value, the stop value of voltage；The inspection
Survey voltage initial value be peak in the open-circuit voltage of photovoltaic cell group string that each inverter is separately connected or
For setting value；The stop value of the detection voltage is 0 or is setting value.
Optionally, the detection unit 502 is specifically used for:
It is instructed according to the time synchronization, realizes time synchronization between the Power Station Monitored Control System；And according to the fortune
The detection parameters for including in the instruction of row parameter detecting, detect the operating parameter for the photovoltaic cell group string connecting with itself.
Optionally, the detection parameters further include detecting the scanning step and the detection voltage in the intensive section of voltage
The scanning step in sparse section, the scanning step in the intensive section are less than the scanning step in the sparse section；
The detection unit 502 is specifically used for:
When reaching the detection starting time, since the initial value of the detection voltage, according to the scanning step
The operating parameter is detected, the stop value to the detection voltage terminates.
Optionally, the detection unit 502 is also used to:
When reaching the detection starting time, since the initial value of the detection voltage, according to default scanning step
The operating parameter is detected, the stop value to the detection voltage terminates；
The inverter further includes setting unit 504, and the default scanning step is that the setting unit 504 is preset
Uniform scanning step-length, or be the pre-set non-homogeneous scanning step of the setting unit 504, wherein it is described non-homogeneous
Scanning step includes the step-length within the scope of step-length and second voltage in first voltage range, and the step-length in first voltage range is small
In the step-length within the scope of second voltage, first voltage range and second voltage range are that the inverter determines based on experience value
's.
Based on the same inventive concept, as shown in fig.6, the embodiment of the present application also provides the power stations in a kind of photovoltaic plant
Monitoring system 600, including transceiver 601 and processor 602, the processor 602 can be executed for calling batch processing
The one or more steps or in which optional embodiment in embodiment are stated, so that the Power Station Monitored Control System 600 is realized
State the Power Station Monitored Control System function in the detection method of photovoltaic cell group string operating parameter.
Preferably, Power Station Monitored Control System 600, further includes memory 603 and bus 604, the memory 603 is for storing
The program that the processor 602 calls, transceiver 601, processor 602, memory 603 are connect with bus 604.
Processor 602 can be central processing unit (English: central processing unit, abbreviation: CPU), network
The combination of processor (English: network processor, abbreviation: NP) or CPU and NP.
Processor 602 can further include hardware chip.Above-mentioned hardware chip can be specific integrated circuit (English
Text: application-specific integrated circuit, abbreviation: ASIC), programmable logic device (English:
Programmable logic device, abbreviation: PLD) or combinations thereof.Above-mentioned PLD can be Complex Programmable Logic Devices
(English: complex programmable logic device, abbreviation: CPLD), field programmable gate array (English:
Field-programmable gate array, abbreviation: FPGA), Universal Array Logic (English: generic array
Logic, abbreviation: GAL) or any combination thereof.
Memory 603 may include volatile memory (English: volatile memory), such as random access memory
Device (English: random-access memory, abbreviation: RAM)；Memory 603 also may include nonvolatile memory (English
Text: non-volatile memory), for example, flash memory (English: flash memory), hard disk (English: hard disk
Drive, abbreviation: HDD) or solid state hard disk (English: solid-state drive, abbreviation: SSD)；Memory 603 can also wrap
Include the combination of the memory of mentioned kind.
Based on the same inventive concept, as shown in fig.7, the embodiment of the present application also provides the inversions in a kind of photovoltaic plant
Device 700, including transceiver 701 and processor 702, the processor 702 can execute above-mentioned implementation for calling batch processing
One or more steps or in which optional embodiment in example, so that the inverter 700 realizes above-mentioned photovoltaic cell group
The function of inverter in the detection method of string operating parameter.
Preferably, inverter 700 further includes memory 703 and bus 704, the memory 703 is for storing the place
The program that device 702 calls is managed, transceiver 701, processor 702, memory 703 are connect with bus 704.
Processor 702 can be central processing unit (English: central processing unit, abbreviation: CPU), network
The combination of processor (English: network processor, abbreviation: NP) or CPU and NP.
Processor 702 can further include hardware chip.Above-mentioned hardware chip can be specific integrated circuit (English
Text: application-specific integrated circuit, abbreviation: ASIC), programmable logic device (English:
Programmable logic device, abbreviation: PLD) or combinations thereof.Above-mentioned PLD can be Complex Programmable Logic Devices
(English: complex programmable logic device, abbreviation: CPLD), field programmable gate array (English:
Field-programmable gate array, abbreviation: FPGA), Universal Array Logic (English: generic array
Logic, abbreviation: GAL) or any combination thereof.
Memory 703 may include volatile memory (English: volatile memory), such as random access memory
Device (English: random-access memory, abbreviation: RAM)；Memory 703 also may include nonvolatile memory (English
Text: non-volatile memory), for example, flash memory (English: flash memory), hard disk (English: hard disk
Drive, abbreviation: HDD) or solid state hard disk (English: solid-state drive, abbreviation: SSD)；Memory 703 can also wrap
Include the combination of the memory of mentioned kind.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although the preferred embodiment of the application has been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out various modification and variations without departing from this Shen to the embodiment of the present application
Please embodiment spirit and scope.In this way, if these modifications and variations of the embodiment of the present application belong to the claim of this application
And its within the scope of equivalent technologies, then the application is also intended to include these modifications and variations.
Claims (26)
1. a kind of detection method of photovoltaic cell group string operating parameter characterized by comprising
Power Station Monitored Control System in photovoltaic plant is detected to each inverter transmission group string connecting with the Power Station Monitored Control System
It instructs, is connected separately with photovoltaic cell group string to be detected on each inverter, described group of string detection instruction is used to indicate
Each inverter: at the same time, according to identical detection parameters, the photovoltaic cell group string connecting with itself is detected
Operating parameter；
The Power Station Monitored Control System receives the operation ginseng for the photovoltaic cell group string of each inverter fed connecting with itself
Several testing results, and testing result is analyzed and processed.
2. the method as described in claim 1, which is characterized in that described group of string detection instruction includes time synchronization instruction and operation
Parameter detecting instruction；
The time synchronization instruction, which is used to indicate between each inverter and the Power Station Monitored Control System, realizes time synchronization；
Include the detection parameters in operating parameter instruction, the operating parameter instruction for each inverter with
After realizing time synchronization between the Power Station Monitored Control System, indicate that each inverter is examined according to the detection parameters respectively
Survey the operating parameter for the photovoltaic cell group string connecting with itself.
3. method according to claim 1 or 2, which is characterized in that the detection parameters include: detection starting time, detection
The initial value of voltage, stop value；The initial value of the detection voltage is the photovoltaic cell group that each inverter is separately connected
Peak in the open-circuit voltage of string is setting value；The stop value of the detection voltage is 0 or is setting value.
4. method as claimed in claim 3, which is characterized in that the detection parameters further include detecting the scanning step of voltage；
The Power Station Monitored Control System is according to the scanning step for detecting voltage as described in determining under type:
The initial value of the detection voltage is divided into intensive section and sparse section to the voltage range between stop value；
The scanning step in the intensive section and the sparse section is determined respectively, wherein the scanning step in the intensive section
Less than the scanning step in the sparse section.
5. method as claimed in claim 4, which is characterized in that the Power Station Monitored Control System by it is described detection voltage initial value
It is divided into intensive section and sparse section to the voltage range between stop value, is specifically included:
Peak or the setting value in open-circuit voltage of the Power Station Monitored Control System based on each inverter determine
Reference voltage value；The reference voltage value approaches the maximum power point for the photovoltaic cell group string that each inverter is separately connected
Corresponding voltage value；
On the basis of the reference voltage value, two with the voltage difference absolute value of the reference voltage value for given threshold are chosen
Voltage value is respectively positioned on the starting as the first voltage value and second voltage value, the first voltage value and the second voltage value
Between value and the stop value, the voltage range between the first voltage value and the second voltage value is determined as described close
Collect section；By between the first voltage value and the initial value voltage range and the second voltage value and the end
Only the range between value is determined as the sparse section.
6. the method as described in claim 1, which is characterized in that the Power Station Monitored Control System is connected described each by communication device
A inverter, and the Power Station Monitored Control System sends described group of string to each inverter by the communication device respectively and examines
Survey instruction.
7. a kind of detection method of photovoltaic cell group string operating parameter characterized by comprising
Inverter in photovoltaic plant receives the group string detection instruction that Power Station Monitored Control System is sent, and described group of string detection instruction is used for
Indicate that each inverter connecting with the Power Station Monitored Control System is distinguished at the same time, according to identical detection parameters, inspection
Survey the operating parameter for the photovoltaic cell group string connecting with itself；
The operating parameter for the photovoltaic cell group string that the inverter is connect according to described group of string detection instruction detection with itself, and will
Testing result feeds back to the Power Station Monitored Control System.
8. the method for claim 7, which is characterized in that described group of string detection instruction includes time synchronization instruction and operation
Parameter detecting instruction；
It include the detection parameters in the operating parameter instruction, the detection parameters include: the detection starting time, detect voltage
Initial value, stop value；The initial value of the detection voltage is the photovoltaic cell group string that each inverter is separately connected
Peak in open-circuit voltage is setting value；The stop value of the detection voltage is 0 or is setting value.
9. method according to claim 8, which is characterized in that the inverter is according to described group of string detection instruction detection and certainly
The operating parameter of the photovoltaic cell group string of body connection, comprising:
The inverter is instructed according to the time synchronization, realizes time synchronization between the Power Station Monitored Control System；And according to
The detection parameters for including in the operational parameter detection instruction detect the operation ginseng for the photovoltaic cell group string connecting with itself
Number.
10. method as claimed in claim 9, which is characterized in that the detection parameters further include detecting the intensive section of voltage
Scanning step and the detection voltage sparse section scanning step, the scanning step in the intensive section is less than described dilute
Dredge the scanning step in section；
It is described to detect the photovoltaic cell connecting with itself according to the detection parameters for including in operational parameter detection instruction
The operating parameter of group string, specifically includes:
When reaching the detection starting time, since the initial value of the detection voltage, detected according to the scanning step
The operating parameter, the stop value to the detection voltage terminate.
11. method as claimed in claim 9, which is characterized in that it is described according to the operational parameter detection instruction in include
The operating parameter for the photovoltaic cell group string that the detection parameters detection is connect with itself, specifically includes:
When reaching the detection starting time, since the initial value of the detection voltage, detected according to default scanning step
The operating parameter, the stop value to the detection voltage terminate；
The default scanning step is the pre-set uniform scanning step-length of the inverter, or sets in advance for the inverter
The non-homogeneous scanning step set, wherein the non-homogeneous scanning step includes step-length and second voltage in first voltage range
Step-length in range, the step-length in first voltage range are less than the step-length within the scope of second voltage, first voltage range and second
Voltage range is that the inverter determines based on experience value.
12. the Power Station Monitored Control System in a kind of photovoltaic plant characterized by comprising
Transmission unit, for each inverter being connect with Power Station Monitored Control System transmission group string detection instruction respectively, institute
It states and is connected separately with photovoltaic cell group string to be detected on each inverter, described group of string detection instruction is used to indicate described each
Inverter: the operation ginseng for the photovoltaic cell group string being connect at the same time, according to identical detection parameters, detection with itself
Number；
Receiving unit, the operating parameter of the photovoltaic cell group string being connect with itself for receiving each inverter fed
Testing result；
Processing unit, for being analyzed and processed to the testing result that the receiving unit receives.
13. Power Station Monitored Control System as claimed in claim 12, which is characterized in that described group of string detection instruction includes time synchronization
Instruction and operational parameter detection instruction；
The time synchronization instruction, which is used to indicate between each inverter and the Power Station Monitored Control System, realizes time synchronization；
Include the detection parameters in operating parameter instruction, the operating parameter instruction for each inverter with
After realizing time synchronization between the Power Station Monitored Control System, indicate that each inverter is examined according to the detection parameters respectively
Survey the operating parameter for the photovoltaic cell group string connecting with itself.
14. Power Station Monitored Control System as described in claim 12 or 13, which is characterized in that the detection parameters include: that detection is opened
The dynamic time, detect initial value, the stop value of voltage；Initial value each inverter of the detection voltage is separately connected
Peak in the open-circuit voltage of photovoltaic cell group string is setting value；The stop value of the detection voltage is 0 or to set
Definite value.
15. Power Station Monitored Control System as claimed in claim 14, which is characterized in that the detection parameters further include detection voltage
Scanning step；
The Power Station Monitored Control System further includes determination unit；
The determination unit is specifically used for:
According to the scanning step for detecting voltage as described in determining under type:
The initial value of the detection voltage is divided into intensive section and sparse section to the voltage range between stop value；
The scanning step in the intensive section and the sparse section is determined respectively, wherein the scanning step in the intensive section
Less than the scanning step in the sparse section.
16. Power Station Monitored Control System as claimed in claim 15, which is characterized in that the determination unit is specifically used for:
Peak or the setting value in open-circuit voltage based on each inverter, determine reference voltage value；It is described
Reference voltage value approaches the corresponding voltage value of maximum power point for the photovoltaic cell group string that each inverter is separately connected；
On the basis of the reference voltage value, two with the voltage difference absolute value of the reference voltage value for given threshold are chosen
Voltage value is respectively positioned on the starting as the first voltage value and second voltage value, the first voltage value and the second voltage value
Between value and the stop value, the voltage range between the first voltage value and the second voltage value is determined as described close
Collect section；By between the first voltage value and the initial value voltage range and the second voltage value and the end
Only the range between value is determined as the sparse section.
17. Power Station Monitored Control System as claimed in claim 13, which is characterized in that the Power Station Monitored Control System passes through communication device
Connect each inverter；
The transmission unit is specifically used for, and sends described group of string detection respectively to each inverter by the communication device
Instruction.
18. the inverter in a kind of photovoltaic plant characterized by comprising
Receiving unit, for receiving the group string detection instruction of Power Station Monitored Control System transmission, described group of string detection instruction is used to indicate
Each inverter for being connect with the Power Station Monitored Control System respectively at the same time, according to identical detection parameters, detection with
The operating parameter of the photovoltaic cell group string of itself connection；
Detection unit, for detecting the photovoltaic electric connecting with itself according to the received described group of string detection instruction of the receiving unit
The operating parameter of pond group string；
Transmission unit, the testing result for detecting the detection unit feed back to the Power Station Monitored Control System.
19. inverter as claimed in claim 18, which is characterized in that described group of string detection instruction include time synchronization instruction and
Operational parameter detection instruction；
It include the detection parameters in the operating parameter instruction, the detection parameters include: the detection starting time, detect voltage
Initial value, stop value；The initial value of the detection voltage is the photovoltaic cell group string that each inverter is separately connected
Peak in open-circuit voltage is setting value；The stop value of the detection voltage is 0 or is setting value.
20. inverter as claimed in claim 19, which is characterized in that the detection unit is specifically used for:
It is instructed according to the time synchronization, realizes time synchronization between the Power Station Monitored Control System；And join according to the operation
The detection parameters for including in number detection instruction, detect the operating parameter for the photovoltaic cell group string connecting with itself.
21. inverter as claimed in claim 20, which is characterized in that the detection parameters further include detecting the compact district of voltage
Between scanning step and the detection voltage sparse section scanning step, the scanning step in the intensive section is less than described
The scanning step in sparse section；
The detection unit is specifically used for:
When reaching the detection starting time, since the initial value of the detection voltage, detected according to the scanning step
The operating parameter, the stop value to the detection voltage terminate.
22. inverter as claimed in claim 20, which is characterized in that the detection unit is specifically used for:
When reaching the detection starting time, since the initial value of the detection voltage, detected according to default scanning step
The operating parameter, the stop value to the detection voltage terminate；
The inverter further includes setting unit, and the default scanning step is the pre-set uniform scanning of the setting unit
Step-length, or be the pre-set non-homogeneous scanning step of the setting unit, wherein the non-homogeneous scanning step includes the
The step-length within the scope of step-length and second voltage in one voltage range, the step-length in first voltage range are less than second voltage range
Interior step-length, first voltage range and second voltage range are that the inverter determines based on experience value.
23. the Power Station Monitored Control System in a kind of photovoltaic plant, which is characterized in that including transceiver and processor, the processor
For calling batch processing, so that the Power Station Monitored Control System executes as the method according to claim 1 to 6.
24. Power Station Monitored Control System as claimed in claim 23, which is characterized in that further include memory, the memory is used for
Store the program that the processor calls.
25. the inverter in a kind of photovoltaic plant, which is characterized in that including transceiver and processor, the processor is for adjusting
With batch processing, so that the inverter executes such as the described in any item methods of claim 7-11.
26. inverter as claimed in claim 25, which is characterized in that further include memory, the memory is for storing institute
State the program of processor calling.
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| CN109655516B (en) * | 2018-12-31 | 2020-04-10 | 深圳硅基传感科技有限公司 | Electrochemical parameter testing platform |
| CN110297136B (en) * | 2019-05-28 | 2022-01-11 | 华为数字技术（苏州）有限公司 | Detection condition determination method and device and photovoltaic system |
| CN113157830B (en) * | 2020-01-22 | 2024-05-17 | 华为数字能源技术有限公司 | Position updating method and device for photovoltaic string |
| CN114498725A (en) * | 2020-11-13 | 2022-05-13 | 华为数字能源技术有限公司 | Photovoltaic power generation system, photovoltaic inverter and IV curve scanning method |
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| CN102545697A (en) * | 2010-12-24 | 2012-07-04 | 阿特斯(中国)投资有限公司 | Maximum power point tracking controller of photovoltaic assembly and photovoltaic assembly system |
| CN103580090A (en) * | 2012-08-06 | 2014-02-12 | 三星Sdi株式会社 | Battery system and energy storage system including the battery system |
| CN104506137A (en) * | 2014-11-26 | 2015-04-08 | 北京金鸿泰科技有限公司 | Equipment fault diagnosis method and apparatus |
| CN104601110A (en) * | 2015-01-21 | 2015-05-06 | 无锡上能新能源有限公司 | Method for on-line detection of characteristic parameters of photovoltaic cell assembly |
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