CN114421887A - Detection method and detection device for operation mode of photovoltaic converter - Google Patents

Detection method and detection device for operation mode of photovoltaic converter Download PDF

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Publication number
CN114421887A
CN114421887A CN202210191636.3A CN202210191636A CN114421887A CN 114421887 A CN114421887 A CN 114421887A CN 202210191636 A CN202210191636 A CN 202210191636A CN 114421887 A CN114421887 A CN 114421887A
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photovoltaic
voltage
converters
value
converter
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张惠珍
王娜
吴金荣
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Xiamen Kehua Digital Energy Tech Co Ltd
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Xiamen Kehua Digital Energy Tech Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

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Abstract

The invention provides a detection method and a detection device for an operation mode of a photovoltaic converter. The detection method comprises the following steps: detecting a voltage difference of input voltage between the two photovoltaic converters as a first voltage difference; if the first pressure difference is larger than a first threshold value, determining that the two photovoltaic converters are in an independent operation mode; if the first voltage difference is not larger than the first threshold value, disturbing the input voltage of the first photovoltaic converter in the two photovoltaic converters; detecting a voltage difference of input voltage between the two photovoltaic converters as a second voltage difference; if the second pressure difference is smaller than a second threshold value and the duration of the second pressure difference smaller than the second threshold value is longer than a set duration, determining that the two photovoltaic converters are in a parallel operation mode; wherein the first threshold is greater than the second threshold. The method can realize the correct detection of the operation mode among the multiple photovoltaic converters.

Description

Detection method and detection device for operation mode of photovoltaic converter
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a method and a device for detecting an operation mode of a photovoltaic converter.
Background
In a photovoltaic power generation system, a photovoltaic converter is used to convert electrical energy generated by a photovoltaic module into direct current or alternating current. In the process, the photovoltaic converter has the function of exerting the performance of the photovoltaic module and protecting the system to the maximum extent. For example, an automatic operation and shutdown function, a maximum power tracking control function, an anti-independent operation function, an automatic voltage regulation function, a direct current detection function, a direct current ground detection function, and the like.
When the multiple photovoltaic converters work in a parallel mode, the operation mode of the multiple photovoltaic converters is related to the power generation condition of the photovoltaic module. For example, when the power generation conditions of multiple photovoltaic modules are similar, the multiple photovoltaic converters corresponding to the multiple photovoltaic modules may operate in a parallel operation mode, that is, the operation conditions of the multiple photovoltaic converters are the same, such as the input voltage values between the multiple photovoltaic converters follow changes. Or, when the generated power of one or more paths of photovoltaic modules is small, the operating conditions of the photovoltaic converters corresponding to the one or more paths of photovoltaic modules are different from those of other paths, and the multiple paths of photovoltaic converters may operate in an independent operating mode, for example, the input voltage values between the multiple paths of photovoltaic converters are not related to each other and cannot change along with the change.
The maximum power tracking control of the photovoltaic power generation system needs to jointly control the multiple photovoltaic converters and needs to correctly detect the operation modes among the multiple photovoltaic converters so as to avoid the situation of disordered control of the multiple photovoltaic converters. How to correctly detect the operation mode among the multiple photovoltaic converters needs to be solved urgently.
Disclosure of Invention
The invention provides a method and a device for detecting the operation mode of a photovoltaic converter, which can realize the correct detection of the operation mode among multiple paths of photovoltaic converters.
In a first aspect, the present invention provides a method for detecting an operation mode of a photovoltaic converter, the method comprising: detecting a voltage difference of input voltage between the two photovoltaic converters as a first voltage difference; if the first pressure difference is larger than a first threshold value, determining that the two photovoltaic converters are in an independent operation mode; if the first voltage difference is not larger than the first threshold value, disturbing the input voltage of the first photovoltaic converter in the two photovoltaic converters; detecting a voltage difference of input voltage between the two photovoltaic converters as a second voltage difference; if the second pressure difference is smaller than a second threshold value and the duration of the second pressure difference smaller than the second threshold value is longer than a set duration, determining that the two photovoltaic converters are in a parallel operation mode; wherein the first threshold is greater than the second threshold.
The invention provides a method for detecting an operation mode of a photovoltaic converter, wherein for any two photovoltaic converters in a photovoltaic power generation system, a first threshold value and a second threshold value are set, the first threshold value is larger than the second threshold value, and then the operation mode between the two photovoltaic converters is judged based on the first threshold value and the second threshold value, so that the return difference judgment in the operation mode judgment process is realized, the repeated judgment frequency in the operation mode judgment process is reduced, and the accuracy of the operation mode judgment between the two photovoltaic converters is improved. Further, when the first pressure difference is not greater than the first threshold value and the second pressure difference is smaller than the second threshold value, the duration that the second pressure difference is smaller than the second threshold value is judged, and when the duration is larger than a set duration, the two photovoltaic converters are determined to be in a parallel operation mode. The invention combines the time length judgment on the basis of the return difference judgment, and further improves the accuracy of the judgment of the parallel operation mode. Therefore, the invention realizes the correct detection of the operation mode among the multiple photovoltaic converters.
In one possible implementation, after detecting the voltage difference of the input voltage between the two photovoltaic converters, as the second voltage difference, the method further includes: and if the second pressure difference is not less than the second threshold value, or the duration of the second pressure difference being less than the second threshold value is not more than the set duration, determining that the two photovoltaic converters are in the independent operation mode.
In a possible implementation manner, before disturbing the input voltage of the first photovoltaic converter of the two photovoltaic converters, the method further includes: calculating the weight values of the two photovoltaic converters; the weight value of the photovoltaic converter is used for representing the operating condition of the photovoltaic converter in a plurality of photovoltaic converters of the photovoltaic power generation system; and determining the photovoltaic converter with the smaller weight value as the first photovoltaic converter.
In one possible implementation, calculating the weight values of the two photovoltaic converters includes: according to formula Di＝Pi+i*m+QiN, calculating the weight values of the two photovoltaic converters; wherein i represents the serial number of the ith photovoltaic converter in the plurality of photovoltaic converters; diIs the weight value of the ith photovoltaic converter, PiFor indicating whether the ith photovoltaic converter satisfies a boost condition, QiFor indicating whether the ith photovoltaic converter is faulty or not, m and n are constants related to the number of the plurality of photovoltaic converters.
In one possible implementation, perturbing the input voltage of a first of the two photovoltaic converters comprises: determining the open-circuit voltage and the filling factor of a photovoltaic module corresponding to the first photovoltaic converter; the filling factor represents the ratio of the maximum output power to the limit output power of the photovoltaic module; determining an upper limit value of the disturbance voltage value based on the open-circuit voltage and the filling factor; determining the first threshold value as a lower limit value of the disturbance voltage value; selecting a value between the upper limit value and the lower limit value of the disturbance voltage value as the disturbance voltage value; and determining a voltage set value of the first photovoltaic converter based on the input voltage and the disturbance voltage value of the first photovoltaic converter.
In one possible implementation manner, the detection method further includes: acquiring sampling precision and line voltage drop of a photovoltaic power generation system where two photovoltaic converters are located, wherein the sampling precision represents the detection precision of input voltage of the photovoltaic converters, and the line voltage drop represents line loss between a photovoltaic module and the photovoltaic converters; determining a first threshold value and a voltage return difference value based on the sampling precision and the line voltage drop, wherein the voltage return difference value is a difference value between the voltage difference of the input voltage when the two photovoltaic converters are judged to be in the independent operation mode and the voltage difference of the input voltage when the two photovoltaic converters are judged to be in the parallel operation mode; and determining the difference value of the first threshold value and the voltage return difference value as a second threshold value.
In one possible implementation, after detecting the voltage difference of the input voltage between the two photovoltaic converters, as the second voltage difference, the method further includes: detecting the current of a first photovoltaic converter of the two photovoltaic converters; and if the current is smaller than the fault current threshold value of the first photovoltaic converter, reducing the disturbance voltage value of the first photovoltaic converter, re-disturbing the input voltage of the first photovoltaic converter based on the reduced disturbance voltage value, re-detecting the voltage difference of the input voltage between the two photovoltaic converters as a third voltage difference, and determining the operation mode of the two photovoltaic converters based on the third voltage difference.
In one possible implementation, after detecting the voltage difference of the input voltage between the two photovoltaic converters, as the second voltage difference, the method further includes: detecting the current of a first photovoltaic converter of the two photovoltaic converters; if the current is larger than the saturation current threshold value of the first photovoltaic converter, determining that the two photovoltaic converters are in a parallel operation mode; the saturation current threshold of the photovoltaic converter is used for representing the current of the photovoltaic module corresponding to the photovoltaic converter when the photovoltaic module is at the maximum output power.
In a second aspect, an embodiment of the present invention provides an apparatus for detecting an operation mode of a photovoltaic converter, including: a communication module and a processing module; the communication module is used for detecting the voltage difference of input voltage between the two photovoltaic converters as first voltage difference; the processing module is used for determining that the two photovoltaic converters are in an independent operation mode if the first pressure difference is larger than a first threshold value; the processing module is used for disturbing the input voltage of a first photovoltaic converter in the two photovoltaic converters if the first voltage difference is not greater than a first threshold value; the communication module is also used for detecting the voltage difference of the input voltage between the two photovoltaic converters as a second voltage difference; the processing module is further used for determining that the two photovoltaic converters are in a parallel operation mode if the second pressure difference is smaller than a second threshold value and the duration of the second pressure difference smaller than the second threshold value is longer than a set duration; wherein the first threshold is greater than the second threshold.
In a possible implementation manner, the processing module is further configured to determine that the two photovoltaic converters are in the independent operation mode if the second pressure difference is not less than the second threshold, or if a duration of the second pressure difference being less than the second threshold is not greater than a set duration.
In a possible implementation manner, the processing module is specifically configured to calculate weight values of the two photovoltaic converters; the weight value of the photovoltaic converter is used for representing the operating condition of the photovoltaic converter in a plurality of photovoltaic converters of the photovoltaic power generation system; and determining the photovoltaic converter with the smaller weight value as the first photovoltaic converter.
In a possible implementation, the processing module is specifically configured to perform the processing according to formula Di＝Pi+i*m+QiN, calculating the weight values of the two photovoltaic converters; wherein i represents the serial number of the ith photovoltaic converter in the plurality of photovoltaic converters; diIs the weight value of the ith photovoltaic converter, PiFor indicating whether the ith photovoltaic converter satisfies a boost condition, QiFor indicating whether the ith photovoltaic converter is faulty or not, m and n are constants related to the number of the plurality of photovoltaic converters.
In a possible implementation manner, the processing module is specifically configured to determine an open-circuit voltage and a fill factor of a photovoltaic module corresponding to the first photovoltaic converter; the filling factor represents the ratio of the maximum output power to the limit output power of the photovoltaic module; determining an upper limit value of the disturbance voltage value based on the open-circuit voltage and the filling factor; determining the first threshold value as a lower limit value of the disturbance voltage value; selecting a value between the upper limit value and the lower limit value of the disturbance voltage value as the disturbance voltage value; and determining a voltage set value of the first photovoltaic converter based on the input voltage and the disturbance voltage value of the first photovoltaic converter.
In a possible implementation manner, the communication module is further configured to obtain sampling accuracy and line voltage drop of a photovoltaic power generation system where the two photovoltaic converters are located, where the sampling accuracy represents detection accuracy of input voltage of the photovoltaic converters, and the line voltage drop represents line loss between the photovoltaic module and the photovoltaic converters; the processing module is further used for determining a first threshold value and a voltage return difference value based on the sampling precision and the line voltage drop, wherein the voltage return difference value represents a difference value between the voltage difference of the input voltage when the two photovoltaic converters are judged to be in the independent operation mode and the voltage difference of the input voltage when the two photovoltaic converters are judged to be in the parallel operation mode; and determining the difference value of the first threshold value and the voltage return difference value as a second threshold value.
In a possible implementation manner, the communication module is further configured to detect a current of a first photovoltaic converter of the two photovoltaic converters; and the processing module is further used for reducing the disturbance voltage value of the first photovoltaic converter if the current is smaller than the fault current threshold value of the first photovoltaic converter, re-disturbing the input voltage of the first photovoltaic converter based on the reduced disturbance voltage value, re-detecting the voltage difference of the input voltage between the two photovoltaic converters as a third voltage difference, and determining the operation mode of the two photovoltaic converters based on the third voltage difference.
In a possible implementation manner, the communication module is further configured to detect a current of a first photovoltaic converter of the two photovoltaic converters; the processing module is further used for determining that the two photovoltaic converters are in a parallel operation mode if the current is larger than the saturation current threshold of the first photovoltaic converter; the saturation current threshold of the photovoltaic converter is used for representing the current of the photovoltaic module corresponding to the photovoltaic converter when the photovoltaic module is at the maximum output power.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes a memory and a processor, where the memory stores a computer program, and the processor is configured to call and execute the computer program stored in the memory to perform the steps of the method according to any one of the foregoing first aspect and possible implementation manners of the first aspect.
In a fourth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the method according to the first aspect and any one of the possible implementation manners of the first aspect.
For technical effects brought by any one of the implementation manners of the second aspect to the fourth aspect, reference may be made to technical effects brought by a corresponding implementation manner of the first aspect, and details are not described here.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic view of a scene of a method for detecting an operation mode of a photovoltaic converter according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for detecting an operation mode of a photovoltaic converter according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another method for detecting an operation mode of a photovoltaic converter according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of another method for detecting an operation mode of a photovoltaic converter according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of another method for detecting an operation mode of a photovoltaic converter according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a detection device for detecting an operation mode of a photovoltaic converter according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In the description of the present invention, "/" means "or" unless otherwise specified, for example, a/B may mean a or B. "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Further, "at least one" or "a plurality" means two or more. The terms "first", "second", and the like do not necessarily limit the number and execution order, and the terms "first", "second", and the like do not necessarily limit the difference.
In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion for ease of understanding.
Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or modules, but may alternatively include other steps or modules not listed or inherent to such process, method, article, or apparatus.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is a scene schematic diagram of a method for detecting an operation mode of a photovoltaic converter according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a photovoltaic power supply system, which includes a plurality of photovoltaic modules, a plurality of photovoltaic converters, and a bus bar, where the photovoltaic modules and the photovoltaic converters correspond to each other one to one. The photovoltaic module converts solar energy into electrical energy. The photovoltaic converter converts the electric energy provided by the photovoltaic module and then provides the converted electric energy for the bus.
In some embodiments, the photovoltaic converter may be a DC-DC converter, and accordingly, the bus is a DC bus.
In other embodiments, the photovoltaic converter may be a DC-AC converter and, correspondingly, the bus may be an AC bus.
It should be noted that the output of the photovoltaic module varies with the intensity of solar radiation and the temperature of the photovoltaic module itself. In addition, because the photovoltaic module has the characteristic that the voltage decreases along with the increase of the current, the photovoltaic module has an optimal working point for obtaining the maximum power in the power generation process. The intensity of the solar radiation is changing and it is clear that the optimum operating point is also changing. Relative to the changes, the working point of the photovoltaic assembly is always positioned at the maximum power point, the system always obtains the maximum power output from the photovoltaic assembly, and the control is the maximum power tracking control.
When the multi-channel photovoltaic converter operates, a parallel operation mode and an independent operation mode exist. In the process of carrying out maximum power tracking control on the multipath photovoltaic converter, the operation mode of the multipath photovoltaic converter needs to be determined. Therefore, the operation mode between the multiple photovoltaic converters needs to be correctly detected so as to avoid the situation that the control of the multiple photovoltaic converters is disordered.
To solve the above technical problem, as shown in fig. 2, an embodiment of the present invention provides a method for detecting an operation mode of a photovoltaic converter, which is executed by a detection apparatus for detecting an operation mode of a photovoltaic converter, and the detection method includes steps S201 to S203.
S201, detecting the voltage difference of input voltage between the two photovoltaic converters as a first voltage difference.
In some embodiments, the two photovoltaic converters may be any two photovoltaic converters in the photovoltaic power generation system shown in fig. 1.
It should be noted that the input voltage of the photovoltaic converter is the voltage of the input terminal of the photovoltaic converter connected to the photovoltaic module.
S202, if the first pressure difference is larger than a first threshold value, the two photovoltaic converters are determined to be in an independent operation mode.
It is understood that the first voltage difference is greater than the first threshold value, which indicates that the voltage difference between the input voltages of the two photovoltaic converters is large, the following performance between the two photovoltaic converters is poor, the probability that the two photovoltaic converters are in the independent operation mode is large, and the detection device may determine that the two photovoltaic converters are in the independent operation mode when the first voltage difference is greater than the first threshold value.
S203, if the first voltage difference is not larger than the first threshold value, disturbing the input voltage of the first photovoltaic converter in the two photovoltaic converters.
It should be noted that when the first differential pressure is not greater than the first threshold, the probability that the two photovoltaic converters are in the parallel operation mode is greater. In order to improve the accuracy of the parallel operation mode judgment, the detection device can further detect the following performance between the two photovoltaic converters by disturbing the input voltage of the first photovoltaic converter.
As a possible implementation manner, the detection device may adjust the operating point of the photovoltaic module by adjusting the duty ratio of the first photovoltaic converter, so as to achieve disturbance of the voltage of the first photovoltaic converter.
Optionally, the detection device may determine a disturbance voltage value of the first photovoltaic converter based on a circuit parameter of the photovoltaic module corresponding to the first photovoltaic converter, and then disturb the input voltage of the first photovoltaic converter based on the disturbance voltage value.
As a possible implementation, as shown in fig. 3, perturbing the input voltage of the first photovoltaic converter may be embodied as steps a1-a 5.
And A1, determining the open circuit voltage and the filling factor of the photovoltaic module corresponding to the first photovoltaic converter.
Wherein, the filling factor represents the ratio of the maximum output power and the limit output power of the photovoltaic module.
In some embodiments, the detection device may directly obtain the pre-stored open circuit voltage and fill factor of each photovoltaic module.
A2, determining the upper limit value of the disturbance voltage value based on the open-circuit voltage and the filling factor.
In some embodiments, the detection means may determine the upper limit value of the disturbance voltage value based on the following formula.
Umax＝Uc*(1-FF)；
Wherein, UmaxIn order to disturb the upper limit value of the voltage value,Ucand FF is the open-circuit voltage of the photovoltaic module and the fill factor of the photovoltaic module.
And A3, determining the first threshold value as a lower limit value of the disturbance voltage value.
In some embodiments, the first threshold is used to determine whether the two photovoltaic converters are in independent operating mode. For example, the detection device may determine that the two photovoltaic converters are in the independent operation mode when the voltage difference of the input voltage between the two photovoltaic converters is greater than a first threshold value.
A4, selecting a value between the upper limit value and the lower limit value of the disturbance voltage value as the disturbance voltage value.
It should be noted that, by setting the upper limit value and the lower limit value for the disturbance voltage value, the voltage of the first photovoltaic converter can be disturbed more accurately, and the following performance between the two photovoltaic converters can be detected more accurately.
A5, and determining the voltage set value of the first photovoltaic converter based on the input voltage and the disturbance voltage value of the first photovoltaic converter.
In some embodiments, the detection device may determine a difference between the input voltage of the first photovoltaic converter and the disturbance voltage value as a voltage set-point of the first photovoltaic converter, after which the detection device disturbs the input voltage of the first photovoltaic converter to the voltage set-point.
In further exemplary embodiments, the detection device can determine the sum of the input voltage of the first photovoltaic converter and the disturbance voltage value as a voltage setpoint for the first photovoltaic converter, after which the detection device disturbs the input voltage of the first photovoltaic converter to this voltage setpoint.
As a possible implementation, step a5 may also be replaced by determining the voltage setpoint of the first photovoltaic converter based on the open-circuit voltage and the disturbance voltage value of the first photovoltaic converter.
For example, the detection device may determine the difference between the open-circuit voltage and the disturbance voltage value of the first photovoltaic converter as the voltage setpoint of the first photovoltaic converter.
In this way, the detection device can disturb the input voltage of the first photovoltaic converter based on the disturbance voltage value determined in the above embodiment, thereby realizing detection of the following performance between the two photovoltaic converters.
And S204, detecting the voltage difference of the input voltage between the two photovoltaic converters as a second voltage difference.
It should be noted that, after disturbing the input voltage of the first converter, the detection device may determine the following performance between the two photovoltaic converters by detecting a voltage difference of the additional input voltage between the two photovoltaic converters.
S205, if the second pressure difference is smaller than a second threshold value and the duration of the second pressure difference smaller than the second threshold value is longer than a set duration, determining that the two photovoltaic converters are in a parallel operation mode.
In some embodiments, the second threshold is used to determine whether two photovoltaic converters are in a parallel mode of operation. Wherein the first threshold is greater than the second threshold.
Illustratively, the second pressure difference is smaller than the second threshold value, and the duration of the second pressure difference being smaller than the second threshold value is longer than the set duration, which indicates that the following performance between the two photovoltaic converters is better. The detection means may determine that the two photovoltaic converters are in a parallel mode of operation.
The invention provides a method for detecting an operation mode of a photovoltaic converter, wherein for any two photovoltaic converters in a photovoltaic power generation system, a first threshold value and a second threshold value are set, the first threshold value is larger than the second threshold value, and then the operation mode between the two photovoltaic converters is judged based on the first threshold value and the second threshold value, so that the return difference judgment in the operation mode judgment process is realized, the repeated judgment frequency in the operation mode judgment process is reduced, and the accuracy of the operation mode judgment between the two photovoltaic converters is improved. Further, when the first pressure difference is not greater than the first threshold value and the second pressure difference is smaller than the second threshold value, the duration that the second pressure difference is smaller than the second threshold value is judged, and when the duration is larger than a set duration, the two photovoltaic converters are determined to be in a parallel operation mode. The invention combines the time length judgment on the basis of the return difference judgment, and further improves the accuracy of the judgment of the parallel operation mode. Therefore, the invention realizes the correct detection of the operation mode among the multiple photovoltaic converters.
Optionally, after step S202, as shown in fig. 4, the method for detecting the operation mode of the photovoltaic converter according to the embodiment of the present invention further includes the following steps.
And if the second pressure difference is not less than the second threshold value, or the duration of the second pressure difference being less than the second threshold value is not more than the set duration, determining that the two photovoltaic converters are in the independent operation mode.
In some embodiments, the second pressure differential is not less than the second threshold value, indicating that the two photovoltaic converters do not have the possibility of being in a parallel mode of operation. The detection means can directly determine that the two photovoltaic converters are in the independent operating mode.
In some embodiments, the duration that the second voltage difference is less than the second threshold value is not greater than the set duration, indicating that the voltage difference of the input voltage between the two photovoltaic converters is unstable, i.e., the following performance between the two photovoltaic converters is poor, and the detection device may determine that the two photovoltaic converters are in the independent operation mode.
Therefore, the method for detecting the operation mode of the photovoltaic converter provided by the embodiment of the invention can combine threshold judgment and duration judgment to realize more accurate detection of the operation mode of the photovoltaic converter.
Optionally, before step S201, as shown in fig. 4, the method for detecting the operation mode of the photovoltaic converter further includes steps S301 to S303.
S301, calculating weight values of the two photovoltaic converters, and determining the photovoltaic converter with the smaller weight value as a first photovoltaic converter.
The weight value of the photovoltaic converter is used for representing the operating condition of the photovoltaic converter in a plurality of photovoltaic converters of the photovoltaic power generation system.
As a possible implementation, the weight value of the photovoltaic converter may be calculated based on the following formula:
Di＝Pi+i*m+Qi*n；
wherein i representsA serial number of an ith photovoltaic converter in the plurality of photovoltaic converters; diIs the weight value of the ith photovoltaic converter, PiFor indicating whether the ith photovoltaic converter satisfies a boost condition, QiFor indicating whether the ith photovoltaic converter is faulty or not, m and n are constants related to the number of the plurality of photovoltaic converters.
Therefore, the embodiment of the invention can screen the two photovoltaic converters, determine the photovoltaic converter with better operation condition as the first photovoltaic converter, and improve the reliability of the operation mode judgment process, thereby improving the accuracy of the operation mode detection between the two photovoltaic converters.
Optionally, after step S204, as shown in fig. 4, the method for detecting the operation mode of the photovoltaic converter further includes steps S401 to S402.
S401, detecting the current of the first photovoltaic converter in the two photovoltaic converters.
S402, if the current is smaller than the fault current threshold value of the first photovoltaic converter, reducing the disturbance voltage value of the first photovoltaic converter.
In some embodiments, after reducing the value of the disturbance voltage of the first photovoltaic converter, the detection device may re-disturb the input voltage of the first photovoltaic converter based on the reduced value of the disturbance voltage, re-detect a voltage difference of the input voltage between the two photovoltaic converters as a third voltage difference, and determine the operation mode of the two photovoltaic converters based on the third voltage difference.
It should be noted that, in order to prevent the first photovoltaic converter from failing during the detection of the operation modes of the two photovoltaic converters, the embodiment of the present invention detects the current of the first photovoltaic converter, and determines whether the first photovoltaic converter fails based on the current. When the current is smaller than the fault current threshold value, the fault of the first photovoltaic converter is represented, the detection device can reduce the disturbance voltage value of the first photovoltaic converter, increase the difference value between the disturbed voltage given value and the input voltage value of the fault photovoltaic converter, the following performance between the two photovoltaic converters can be conveniently detected, and the accuracy of the operation mode detection between the two photovoltaic converters is improved.
Optionally, as shown in fig. 4, after step S204, the detecting device may further detect the power of the two photovoltaic converters. When the power of the two photovoltaic converters is larger than the set power, the power generation condition of the two photovoltaic converters is good, namely, the solar illumination is strong, and the detection device can directly determine that the two photovoltaic converters are in a parallel operation mode.
Illustratively, after step S204, the method for detecting the operation mode of the photovoltaic converter further includes steps S501 to S502.
S501, detecting the current of the first photovoltaic converter in the two photovoltaic converters.
It can be understood that the current of the first photovoltaic converter is directly related to the generated power of the photovoltaic module, and the invention can realize the detection of the power of the photovoltaic module and the photovoltaic converter by detecting the current of the first photovoltaic converter.
S502, if the current is larger than the saturation current threshold value of the first photovoltaic converter, the two photovoltaic converters are determined to be in a parallel operation mode.
The saturation current threshold of the photovoltaic converter is used for representing the current of the photovoltaic module corresponding to the photovoltaic converter when the photovoltaic module is at the maximum output power.
Therefore, the invention can detect the power of the photovoltaic converter in the process of judging the running mode. When the current of the first photovoltaic converter is larger than the saturation current threshold of the first photovoltaic converter, the first photovoltaic converter is at the maximum output power, the solar illumination is strong, the detection device can directly determine that the two photovoltaic converters are in a parallel operation mode, and the rapid detection of the operation modes of the two photovoltaic converters is realized.
It should be noted that, when the photovoltaic module and the photovoltaic converter are in the over-distribution mode, that is, the maximum output power of the photovoltaic module is greater than the rated power of the photovoltaic converter, the maximum output power of the photovoltaic module is limited by the photovoltaic converter. According to the invention, by setting the saturation current threshold, when the current of the first photovoltaic converter is larger than the saturation current threshold, the detection device can determine that the photovoltaic module and the photovoltaic converter are in an over-distribution mode, the solar illumination is strong, the photovoltaic module generates enough power, and the following performance of the two photovoltaic converters is good.
Alternatively, the detection device may directly determine the first threshold and the second threshold according to an input parameter of a user.
Optionally, the detection device may further determine the first threshold and the second threshold according to sampling accuracy and line voltage drop of the photovoltaic power generation system.
As one possible implementation, as shown in FIG. 5, the first and second thresholds may be determined through steps B1-B3.
And B1, acquiring the sampling precision and the line voltage drop of the photovoltaic power generation system where the two photovoltaic converters are located.
The sampling precision represents the detection precision of the input voltage of the photovoltaic converter, and the line voltage drop represents the line loss between the photovoltaic module and the photovoltaic converter.
B2, determining a first threshold and a voltage back-off value based on the sampling precision and the line voltage drop.
The voltage return difference value represents a difference value between a voltage difference of input voltages when the two photovoltaic converters are judged to be in the independent operation mode and a voltage difference of input voltages when the two photovoltaic converters are judged to be in the parallel operation mode.
In some embodiments, the detection device stores a mapping relationship between the sampling precision and the line voltage drop, and the first threshold and the voltage return difference value in advance. For example, the detection device may store a preset mapping relationship table in advance. The detection device may determine the first threshold value and the voltage back-difference value through the preset mapping relation table.
And B3, determining the difference value of the first threshold value and the voltage return difference value as a second threshold value.
In this way, the embodiment of the present invention may set the second threshold as the difference between the first threshold and the current return difference, and detect the operation modes of the two photovoltaic converters based on the first threshold and the second threshold of the phase difference current return difference. Compared with the operation mode of the two photovoltaic converters judged by a single threshold, the repeated probability of the judgment of the operation mode can be reduced, so that the detection of the following performance between the two photovoltaic converters is more accurate, and the accuracy of the detection of the operation mode between the two photovoltaic converters is improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 6 is a schematic structural diagram illustrating an apparatus for detecting an operation mode of a photovoltaic converter according to an embodiment of the present invention, where the apparatus 600 for detecting an operation mode of a photovoltaic converter includes: a communication module 601 and a processing module 602.
The communication module 601 is configured to detect a voltage difference of an input voltage between two photovoltaic converters as a first voltage difference.
The processing module 602 is configured to determine that the two photovoltaic converters are in the independent operation mode if the first pressure difference is greater than the first threshold.
The processing module 601 is further configured to perturb the input voltage of the first photovoltaic converter of the two photovoltaic converters if the first voltage difference is not greater than the first threshold.
The communication module 601 is further configured to detect a voltage difference of the input voltage between the two photovoltaic converters as a second voltage difference.
The processing module 602 is further configured to determine that the two photovoltaic converters are in a parallel operation mode if the second pressure difference is smaller than a second threshold and a duration of the second pressure difference smaller than the second threshold is greater than a set duration; wherein the first threshold is greater than the second threshold.
In a possible implementation manner, the processing module 602 is further configured to determine that the two photovoltaic converters are in the independent operation mode if the second pressure difference is not less than the second threshold, or if a duration of the second pressure difference being less than the second threshold is not greater than a set duration.
In a possible implementation manner, the processing module 602 is specifically configured to calculate weight values of two photovoltaic converters; the weight value of the photovoltaic converter is used for representing the operating condition of the photovoltaic converter in a plurality of photovoltaic converters of the photovoltaic power generation system; and determining the photovoltaic converter with the smaller weight value as the first photovoltaic converter.
In one possible implementation, the processing module 602 is specifically configured to perform the processing according to formula Di＝Pi+i*m+QiN, calculating the weight values of the two photovoltaic converters; wherein i represents the serial number of the ith photovoltaic converter in the plurality of photovoltaic converters; diIs the weight value of the ith photovoltaic converter, PiFor indicating whether the ith photovoltaic converter satisfies a boost condition, QiFor indicating whether the ith photovoltaic converter is faulty or not, m and n are constants related to the number of the plurality of photovoltaic converters.
In a possible implementation manner, the processing module 602 is specifically configured to determine an open-circuit voltage and a fill factor of a photovoltaic module corresponding to the first photovoltaic converter; the filling factor represents the ratio of the maximum output power to the limit output power of the photovoltaic module; determining an upper limit value of the disturbance voltage value based on the open-circuit voltage and the filling factor; determining the first threshold value as a lower limit value of the disturbance voltage value; selecting a value between the upper limit value and the lower limit value of the disturbance voltage value as the disturbance voltage value; and determining a voltage set value of the first photovoltaic converter based on the input voltage and the disturbance voltage value of the first photovoltaic converter.
In a possible implementation manner, the communication module 601 is further configured to obtain sampling accuracy and line voltage drop of a photovoltaic power generation system where the two photovoltaic converters are located, where the sampling accuracy represents detection accuracy of input voltage of the photovoltaic converters, and the line voltage drop represents line loss between the photovoltaic module and the photovoltaic converters. The processing module 602 is further configured to determine a first threshold and a voltage return difference value based on the sampling precision and the line voltage drop, where the voltage return difference value is a difference between a voltage difference of input voltages when the two photovoltaic converters are determined to be in the independent operation mode and a voltage difference of input voltages when the two photovoltaic converters are determined to be in the parallel operation mode; and determining the difference value of the first threshold value and the voltage return difference value as a second threshold value.
In a possible implementation manner, the communication module 601 is further configured to detect a current of a first photovoltaic converter of the two photovoltaic converters; the processing module 602 is further configured to, if the current is smaller than the fault current threshold of the first photovoltaic converter, reduce the disturbance voltage value of the first photovoltaic converter, re-disturb the input voltage of the first photovoltaic converter based on the reduced disturbance voltage value, re-detect a voltage difference of the input voltage between the two photovoltaic converters as a third voltage difference, and determine an operation mode of the two photovoltaic converters based on the third voltage difference.
In a possible implementation manner, the communication module 601 is further configured to detect a current of a first photovoltaic converter of the two photovoltaic converters; the processing module 602 is further configured to determine that the two photovoltaic converters are in a parallel operation mode if the current is greater than the saturation current threshold of the first photovoltaic converter; the saturation current threshold of the photovoltaic converter is used for representing the current of the photovoltaic module corresponding to the photovoltaic converter when the photovoltaic module is at the maximum output power.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 7, the electronic apparatus 700 of this embodiment includes: a processor 701, a memory 702, and a computer program 703 stored in said memory 702 and executable on said processor 701. The processor 701 implements the steps in the above method embodiments, such as the steps 201 to 205 shown in fig. 2, when executing the computer program 703. Alternatively, the processor 701, when executing the computer program 703, implements the functions of each module/unit in each device embodiment described above, for example, the functions of the communication module 601 and the processing module 602 shown in fig. 6.
Illustratively, the computer program 703 may be partitioned into one or more modules/units that are stored in the memory 702 and executed by the processor 701 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 703 in the electronic device 700. For example, the computer program 703 may be divided into the communication module 601 and the processing module 602 shown in fig. 6.
The Processor 701 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 702 may be an internal storage unit of the electronic device 700, such as a hard disk or a memory of the electronic device 700. The memory 702 may also be an external storage device of the electronic device 700, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like, provided on the electronic device 700. Further, the memory 702 may also include both internal storage units and external storage devices of the electronic device 700. The memory 702 is used for storing the computer program and other programs and data required by the terminal. The memory 702 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. A method for detecting an operation mode of a photovoltaic converter is characterized by comprising the following steps:
detecting a voltage difference of input voltage between the two photovoltaic converters as a first voltage difference;
if the first pressure difference is larger than a first threshold value, determining that the two photovoltaic converters are in an independent operation mode;
if the first voltage difference is not larger than the first threshold value, disturbing the input voltage of the first photovoltaic converter in the two photovoltaic converters; detecting a voltage difference of input voltage between the two photovoltaic converters as a second voltage difference; if the second pressure difference is smaller than a second threshold value, and the duration of the second pressure difference smaller than the second threshold value is longer than a set duration, determining that the two photovoltaic converters are in a parallel operation mode; wherein the first threshold is greater than the second threshold.
2. The method for detecting the operation mode of the photovoltaic converter according to claim 1, wherein the step of detecting the voltage difference of the input voltage between the two photovoltaic converters further comprises, as a second voltage difference:
and if the second pressure difference is not less than a second threshold value, or the duration of the second pressure difference being less than the second threshold value is not more than a set duration, determining that the two photovoltaic converters are in an independent operation mode.
3. The method for detecting the operation mode of the photovoltaic converter according to any one of claims 1 or 2, further comprising, before said disturbing the input voltage of the first of the two photovoltaic converters:
calculating the weight values of the two photovoltaic converters; the weight value of the photovoltaic converter is used for representing the operating condition of the photovoltaic converter in a plurality of photovoltaic converters of the photovoltaic power generation system;
and determining the photovoltaic converter with the smaller weight value as the first photovoltaic converter.
4. The method according to claim 3, wherein the calculating the weight values of the two photovoltaic converters comprises:
according to formula Di＝Pi+i*m+QiN, calculating the weight values of the two photovoltaic converters;
wherein i represents a serial number of an ith photovoltaic converter in the plurality of photovoltaic converters; diIs the weight value of the ith photovoltaic converter, PiFor indicating whether the ith photovoltaic converter satisfies a boost condition, QiFor indicating whether the ith photovoltaic converter is faulty or not, m and n are constants related to the number of the plurality of photovoltaic converters.
5. The method for detecting the operating mode of the photovoltaic converter according to claim 1 or 2, wherein said disturbing the input voltage of the first of the two photovoltaic converters comprises:
determining the open-circuit voltage and the filling factor of a photovoltaic module corresponding to the first photovoltaic converter; the filling factor represents the ratio of the maximum output power to the limit output power of the photovoltaic module;
determining an upper limit value of a disturbance voltage value based on the open-circuit voltage and the fill factor;
determining the first threshold value as a lower limit value of the disturbance voltage value;
selecting a value between an upper limit value and a lower limit value of the disturbance voltage value as the disturbance voltage value;
and determining a voltage given value of the first photovoltaic converter based on the input voltage of the first photovoltaic converter and the disturbance voltage value.
6. Method for detecting the operating mode of a photovoltaic converter according to claim 1 or 2, characterized in that it further comprises:
acquiring sampling precision and line voltage drop of a photovoltaic power generation system where the two photovoltaic converters are located, wherein the sampling precision represents detection precision of input voltage of the photovoltaic converters, and the line voltage drop represents line loss between the photovoltaic module and the photovoltaic converters;
determining the first threshold value and a voltage return difference value based on the sampling precision and the line voltage drop, wherein the voltage return difference value is a difference value between a voltage difference of input voltages when the two photovoltaic converters are judged to be in an independent operation mode and a voltage difference of the input voltages when the two photovoltaic converters are judged to be in a parallel operation mode;
determining a difference between the first threshold and the voltage back-difference value as the second threshold.
7. The method for detecting the operation mode of the photovoltaic converter according to claim 1 or 2, wherein the step of detecting the voltage difference of the input voltage between the two photovoltaic converters further comprises, as a second voltage difference:
detecting a current of a first of the two photovoltaic converters;
and if the current is smaller than the fault current threshold value of the first photovoltaic converter, reducing the disturbance voltage value of the first photovoltaic converter, re-disturbing the input voltage of the first photovoltaic converter based on the reduced disturbance voltage value, re-detecting the voltage difference of the input voltage between the two photovoltaic converters as a third voltage difference, and determining the operation mode of the two photovoltaic converters based on the third voltage difference.
8. The method for detecting the operation mode of the photovoltaic converter according to claim 1 or 2, wherein the step of detecting the voltage difference of the input voltage between the two photovoltaic converters further comprises, as a second voltage difference:
detecting a current of a first of the two photovoltaic converters;
if the current is larger than the saturation current threshold of the first photovoltaic converter, determining that the two photovoltaic converters are in a parallel operation mode; the saturation current threshold of the photovoltaic converter is used for representing the current of the photovoltaic module corresponding to the photovoltaic converter when the photovoltaic module is at the maximum output power.
9. A device for detecting an operating mode of a photovoltaic converter, comprising: a communication module and a processing module;
the processing module is used for disturbing the input voltage of the first photovoltaic converter in the two photovoltaic converters;
the communication module is used for detecting the voltage difference of input voltage between the two photovoltaic converters as a first voltage difference;
the processing module is further configured to determine that the two photovoltaic converters are in a parallel operation mode if the first pressure difference is smaller than a first threshold and a duration of the first pressure difference smaller than the first threshold is longer than a set duration.
10. An electronic device, comprising a memory storing a computer program and a processor for invoking and executing the computer program stored in the memory to perform the method of any one of claims 1 to 8.
CN202210191636.3A 2022-02-28 2022-02-28 Detection method and detection device for operation mode of photovoltaic converter Pending CN114421887A (en)

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