CN114295884A - Loop current protection method and device, electronic equipment and readable memory - Google Patents
Loop current protection method and device, electronic equipment and readable memory Download PDFInfo
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Abstract
The invention discloses a circulation protection method, which comprises the following steps: acquiring circuit parameter information of the combiner box; acquiring theoretical output voltage of the combiner box based on the circuit parameter information, and judging whether the difference value between the theoretical output voltage and the actual output voltage of the combiner box is greater than a first preset threshold value or not; under the condition that the difference value between the theoretical output voltage and the actual voltage is larger than a first preset threshold value, acquiring the average current of each group string in the combiner box and the theoretical power of the combiner box based on the circuit parameter information, and judging whether the difference value between the theoretical power and the actual power exceeds a second preset threshold value or not; and under the condition that the difference value between the theoretical power and the actual power exceeds a second preset threshold value, outputting a result of abnormal string combination. The invention carries out real-time monitoring and early warning on the abnormal circulation, and gives out fault warning in time when the abnormal circulation occurs, thereby reducing the risk of damaging components and related equipment.
Description
Technical Field
The invention belongs to the technical field of photovoltaic electrical equipment, and particularly relates to a circulation protection method and device, electronic equipment and a readable memory.
Background
At present, in order to improve the efficiency of the dc current output of the photovoltaic power generation system, the output voltage of the combiner box is improved in design, and the number of the components connected in series at the input end is increased in a common method, so that the output current at the dc side is reduced, and the loss on a line is reduced. And increase the subassembly number of establishing ties, improve direct current output voltage and be favorable to promoting system work efficiency, nevertheless also have certain hidden danger to the operation of collection flow box, it is most showing: when one or more photovoltaic module plates of one path of input group string are in fault or are influenced by the outside, the input voltage is reduced, voltage deviation occurs in the parallel group string line, and further circuit current circulation is generated, so that part of components are heated, and the output voltage of the combiner box is reduced.
Generally, the voltages of different groups of converged strings have a slight difference, because the internal resistance of the groups of strings is small, the internal heating of the photovoltaic module caused by the internal current circulation is small, but if the output voltage is obviously reduced due to the performance fault of the module, the circuit circulation is increased, the loss heating is increased, elements are burnt in serious conditions, and even fire disasters occur at the junction box of the module or the inlet and outlet wires of the junction box.
In order to avoid such hidden troubles and avoid equipment accidents, it is necessary to monitor and warn abnormal circulation, and prompt information can be accurately sent out when abnormal current circulation occurs in the string circuit, so as to timely process and prevent equipment damage.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a circulation protection method, which can make an early warning in time when abnormal circulation occurs, and reduce the risk of damage to components and related equipment.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a circulation protection method comprises the following steps:
and acquiring the circuit parameter information of the combiner box.
And acquiring theoretical output voltage of the combiner box based on the circuit parameter information, and judging whether the difference value between the theoretical output voltage and the actual output voltage of the combiner box is greater than a first preset threshold value.
And under the condition that the difference value between the theoretical output voltage and the actual voltage is greater than a first preset threshold value, acquiring the average current of each group string in the combiner box and the theoretical power of the combiner box based on the circuit parameter information, and judging whether the difference value between the theoretical power and the actual power exceeds a second preset threshold value.
And under the condition that the difference value between the theoretical power and the actual power exceeds a second preset threshold value, outputting a result of abnormal string combination.
The circuit parameter information includes: the temperature T of a backboard of the component, the irradiance N, the actual voltage u of a combiner box, the actual power p and the current i of each group. And the data acquisition module acquires and stores the circuit parameter information, and the circuit parameter information is retrieved by the power supply voltage difference analysis module and the power difference analysis module. The voltage difference analysis module calculates theoretical output voltage U according to the temperature T and irradiance N of the back plateLComparing the difference value with the actual voltage u, and judging the power difference if the difference value of the two exceeds a first preset threshold value; the power difference analysis module calculates an average current I according to the string current I of each path of group, and the average current I and the theoretical output voltage U are usedLCalculating theoretical power PLThen the theoretical power PLAnd comparing the actual power p, and outputting the abnormal result of the string if the difference value of the actual power p and the actual power p exceeds a second preset threshold value.
Preferably, the first preset threshold may be based on a theoretical output voltage ULOr the actual voltage u value changes; the second preset threshold value may be based on the theoretical power PLOr a change in the value of the actual power p.
Preferably, when the irradiance N is not lower than 300w/m2And then, judging the voltage difference, namely judging whether the difference value between the theoretical output voltage of the combiner box and the actual output voltage of the combiner box is greater than a first preset threshold value. When irradiance N is lower than 300w/m2And when the voltage difference is judged, namely the voltage difference judgment and the power difference judgment function are shielded.
Further, when calculating the average current I:
and obtaining an average current based on the current of each group string of the combiner boxes.
And sequentially judging whether the difference value between the current of each group string and the average current exceeds a third preset threshold value.
And deleting the current of a certain circuit group string under the condition that the difference value between the current of the circuit group string and the average current exceeds a third preset threshold value, and recalculating the average current based on the currents of the rest circuit group strings.
And under the condition that the difference value between the current of each path of group string and the average current does not exceed a third preset threshold value, outputting the currently obtained average current for obtaining theoretical power.
I.e. if the current i of a series of dc circuitskIf the difference value with the average current I exceeds a third preset threshold value, the current I of the series of direct current circuitskWithout taking into account the calculation, the average current I is recalculated for the currents of the remaining string of dc circuits. Until the difference value between each group of current for calculating the average current and the currently calculated average current I does not exceed a third preset threshold value, the currently calculated average current I is output as the calculated theoretical power PLThe basis of (1).
Preferably, the circuit parameter information further includes a busbar temperature; the busbar temperature monitoring module judges whether the busbar temperature exceeds a fourth preset threshold value; and under the condition that the busbar temperature exceeds a fourth preset threshold, the busbar temperature monitoring module outputs a result of abnormal string forming. Under the condition that abnormal circulation occurs, the temperature of the direct current busbar can be remarkably increased in a short time, and the busbar temperature sensor collects temperature signals in real time and sends the temperature signals to the busbar temperature monitoring module, so that the circulation protection device can give an alarm in time, namely, a parallel monitoring alarm mode is added, and the monitoring sensitivity is improved.
Based on the same conception, the invention also provides a circulation protection device for realizing the circulation protection method, which is arranged in a junction box, wherein the junction box comprises a communication board for collecting actual power p, actual voltage u and each path of group series current i, and the circulation protection device is characterized by comprising:
the data acquisition module is used for acquiring the circuit parameter information of the combiner box;
the voltage difference analysis module is used for acquiring theoretical output voltage of the combiner box based on the circuit parameter information and judging whether the difference value between the theoretical output voltage and the actual output voltage of the combiner box is larger than a first preset threshold value or not;
the power difference analysis module is used for acquiring the average current of each path of group string in the combiner box and the theoretical power of the combiner box based on the circuit parameter information under the condition that the difference value between the theoretical output voltage and the actual voltage is larger than a first preset threshold value, and judging whether the difference value between the theoretical power and the actual power exceeds a second preset threshold value or not; and under the condition that the difference value between the theoretical power and the actual power exceeds a second preset threshold value, outputting a result of abnormal string combination. The data acquisition module acquires and stores the temperature T and the irradiance N of the assembly back plate, the actual voltage u and the actual power p of the combiner box and the serial current i of each path of group so as to call the power supply differential pressure analysis module and the power difference analysis module. The voltage difference analysis module calculates theoretical output voltage U according to the temperature T and irradiance N of the back plateLComparing the difference value with the actual voltage u, and judging the power difference if the difference value of the two exceeds a first preset threshold value; the power difference analysis module calculates an average current I according to the string current I of each path of group, and the average current I and the theoretical output voltage U are usedLCalculating theoretical power PLThen the theoretical power P will be calculatedLAnd comparing the actual power p, and outputting the abnormal result of the string if the difference value of the actual power p and the actual power p exceeds a second preset threshold value.
Furthermore, the circulation protection device also comprises an irradiance sensor which is used for collecting solar irradiance and sending the collected irradiance to the data acquisition module. The data acquisition module stores the irradiance N to calculate the theoretical output voltage U by the power supply voltage difference analysis moduleLAnd (5) calling.
Further, the power difference analysis module further includes a current calculation unit for calculating an average current, and the average current is used for calculating the theoretical power.
Furthermore, the circulation protection device further comprises a direct current busbar temperature sensor and a busbar temperature monitoring module, wherein the busbar temperature sensor is used for collecting the temperature of a busbar, and the busbar temperature monitoring module is used for judging whether the temperature of the busbar exceeds a fourth preset threshold value and outputting an abnormal result of the busbar under the condition that the temperature of the busbar exceeds the fourth preset threshold value.
Based on the same concept, the present invention also provides an electronic device, comprising:
a memory for storing a processing program;
a processor which, when executing the processing program, implements the circulation protection method according to any one of claims 1 to 4.
Based on the same concept, the invention further provides a readable storage medium, wherein the readable storage medium stores a processing program, and the processing program realizes the circulation protection method when being executed by a processor.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
the invention carries out real-time monitoring and early warning on the abnormal circulation, and gives out fault warning in time when the abnormal circulation occurs, thereby reducing the risk of damaging components and related equipment. Meanwhile, a voltage difference analysis module and a power difference analysis module are arranged, and the dual analysis module is used for analyzing and judging, so that the accuracy of analysis and judgment is improved. According to the invention, the busbar temperature sensor is arranged, when abnormal circulation occurs, the temperature of the direct current busbar can be obviously increased in a short time, and the busbar temperature sensor collects temperature signals in real time and sends the temperature signals to the busbar temperature monitoring module, so that the circulation protection device can give an alarm in time, namely, a parallel monitoring alarm mode is added, and the monitoring sensitivity is improved.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a flow chart of a method of the present invention for protecting a loop;
FIG. 2 is a flow chart of the current calculating unit calculating the average current I according to the present invention;
fig. 3 is a structural view of a circulation protector according to the present invention.
Description of reference numerals:
1: a component backplane temperature sensor; 2: an irradiance sensor; 3: a communication board; 4: a data acquisition module; 5: a voltage difference analysis module; 6: a power difference analysis module; 7: a busbar temperature sensor; 8: female temperature monitoring module that arranges.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
First embodiment
Referring to fig. 1, the present embodiment provides a method for protecting a circulation flow, including the following steps:
s100: and acquiring the temperature T and irradiance N of a backboard of the assembly, the actual voltage u and actual power p of a combiner box and the serial current i of each group. When spokeIlluminance N is not less than 300w/m2And then, judging the voltage difference.
S200: calculating theoretical output voltage U according to temperature T and irradiance N of assembly back plateL。
S300: judging the output voltage ULWhether the difference with the actual voltage u exceeds a first preset threshold.
S400: at an output voltage ULUnder the condition that the difference value between the current I and the actual voltage U exceeds a first preset threshold value, calculating average current I based on each path of group string current I, and outputting the voltage U based on the average current I and the theoretical output voltage ULCalculating theoretical power PL。
The data acquisition module acquires and stores the temperature T and the irradiance N of the assembly back plate, the actual voltage u and the actual power p of the combiner box and the serial current i of each path of group so as to call the power supply differential pressure analysis module and the power difference analysis module. The voltage difference analysis module calculates theoretical output voltage U according to the temperature T and irradiance N of the back plateLCalculating the theoretical output voltage ULThe method comprises the following steps:
wherein, the temperature correction coefficient mu is 1- (T-25) × 0.5%.
STC irradiance is a standard test condition for photovoltaic modules, and in some specific cases, 1000w/m2。
The voltage difference analysis module outputs a theoretical output voltage ULComparing the difference value with the actual voltage u, and judging the power difference if the difference value of the two exceeds a first preset threshold value; the power difference analysis module calculates an average current I according to the string current I of each path of group, and outputs a voltage U according to the average current I and a theoretical output voltageLCalculating theoretical power PLCalculating the theoretical power PLThe method comprises the following steps:
theoretical power PLNumber of grouped strings n × (theoretical output voltage U)LX group string average current I)
S500: at theoretical power PLDifference from actual power pAnd under the condition that the value exceeds a second preset threshold value, outputting the result of the abnormal string.
In practice, the first preset threshold may be based on the theoretical output voltage ULOr a change in the value of the actual voltage U, e.g. by setting a first predetermined threshold value to the theoretical output voltage ULOr 10% of the actual value of voltage u; the second predetermined threshold may be based on the theoretical power PLOr a change in the value of the actual power P, e.g. setting a second predetermined threshold to the theoretical power PLOr 10% of the value of the actual power p.
Referring to fig. 2, the method for calculating the average current I includes:
s401: and acquiring the actual current of each group string.
S402: and obtaining the average current based on the current of each group string of the combiner boxes.
Average current
S403: sequentially judging the current i of each circuit group stringkIf the difference from the average current I exceeds a third predetermined threshold (k-1 … n).
S404: current i in a string of certain path groupkDeleting the current i of the circuit group string under the condition that the difference value with the average current exceeds a third preset threshold valuekBased on the currents (i) of the other string1，i2，…ik-1，ik+1，…in) And (3) recalculating the average current I and covering the original calculation result:
average current
And under the condition that the difference value between the current of each circuit of group string and the average current does not exceed a third preset threshold value, outputting the currently obtained average current for obtaining the theoretical power.
Until the difference value between each path of group current I for calculating the average current and the currently calculated average current I does not exceed a third preset threshold value, outputting the currently calculated average currentThe average current I is taken as the calculated theoretical power PLThe basis of (1).
S600: and collecting the busbar temperature t.
S700: and judging whether the temperature of the busbar exceeds a fourth preset threshold value or not, and outputting the result of abnormal string combination under the condition that the temperature t of the busbar exceeds the fourth preset threshold value.
Acquiring the temperature t of the direct-current busbar, and judging whether the temperature t of the busbar exceeds a fourth preset threshold value by a busbar temperature monitoring module; and under the condition that the busbar temperature t exceeds a fourth preset threshold, the busbar temperature monitoring module outputs the result of abnormal string. Under the condition that abnormal circulation occurs, the temperature of the direct current busbar can be remarkably increased in a short time, and the busbar temperature sensor collects temperature signals in real time and sends the temperature signals to the busbar temperature monitoring module, so that the circulation protection device can give an alarm in time, namely, a parallel monitoring alarm mode is added, and the monitoring sensitivity is improved.
Second embodiment
As shown in fig. 3, based on the same concept, the present embodiment provides a circular current protection device installed in a combiner box having a communication board 3 for collecting an actual power p, an actual voltage u and each group string current i, including:
and the data acquisition module 4 is used for acquiring the circuit parameter information of the combiner box.
And the voltage difference analysis module 5 is used for acquiring the theoretical output voltage of the combiner box based on the circuit parameter information and judging whether the difference value between the theoretical output voltage and the actual output voltage of the combiner box is greater than a first preset threshold value.
The power difference analysis module 6 is used for acquiring the average current of each path of group string in the combiner box and the theoretical power of the combiner box based on the circuit parameter information under the condition that the difference value between the theoretical output voltage and the actual voltage is greater than a first preset threshold value, and judging whether the difference value between the theoretical power and the actual power exceeds a second preset threshold value or not; and under the condition that the difference value between the theoretical power and the actual power exceeds a second preset threshold value, outputting a result of abnormal string combination.
Further, the circulation protection device further comprises an irradiance sensor 2 for collecting solar irradiance and sending the collected irradiance to the data acquisition module 4. The data acquisition module 4 stores the irradiance N to calculate the theoretical output voltage U by the power supply voltage difference analysis module 5LAnd (5) calling.
Further, the power difference analysis module 6 further includes a current calculation unit for calculating an average current, and the average current is used for calculating the theoretical power.
Further, the circulating current protection device further comprises a direct current busbar temperature sensor 7 and a busbar temperature monitoring module 8, the busbar temperature sensor 7 is used for collecting the temperature of the busbar, and the busbar temperature monitoring module 8 is used for judging whether the temperature of the busbar exceeds a fourth preset threshold value and outputting a result that the string is abnormal under the condition that the temperature of the busbar exceeds the fourth preset threshold value.
Third embodiment
Based on the same concept, the present embodiment provides an electronic device, which includes:
and the memory is used for storing the processing program.
And the processor is used for realizing any circulation protection method when executing the processing program.
Fourth embodiment
Based on the same concept, the embodiment provides a readable storage medium, wherein the readable storage medium stores a processing program, and the processing program is executed by a processor to implement the circulation protection method.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
The working process of the present invention is further explained as follows:
When the voltage difference is judged, the theoretical output voltage U is calculated according to the temperature T and the irradiance N of the backboard of the componentL(ii) a If the theoretical output voltage ULAnd if the difference value between the actual voltage u and the actual voltage u exceeds a first preset threshold value, judging the power difference.
When power difference judgment is carried out, average current I is calculated according to each path of group current I, and the average current I and theoretical output voltage U are usedLCalculating theoretical power PL(ii) a If theoretical power PLAnd if the difference value with the actual power p exceeds a second preset threshold value, outputting the result of the abnormal string.
The direct-current busbar temperature sensor 7 and the busbar temperature monitoring module 8 are respectively used for acquiring the temperature t of the busbar and comparing and judging the temperature t of the busbar with a fourth preset threshold, and when the temperature t of the busbar exceeds the fourth preset threshold, the busbar temperature monitoring module 8 outputs an abnormal result of the busbar string.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (10)
1. A circulation protection method is characterized by comprising the following steps:
acquiring circuit parameter information of the combiner box;
acquiring theoretical output voltage of the combiner box based on the circuit parameter information, and judging whether the difference value between the theoretical output voltage and the actual output voltage of the combiner box is greater than a first preset threshold value or not;
under the condition that the difference value between the theoretical output voltage and the actual voltage is larger than a first preset threshold value, acquiring the average current of each group string in the combiner box and the theoretical power of the combiner box based on the circuit parameter information, and judging whether the difference value between the theoretical power and the actual power exceeds a second preset threshold value or not;
and under the condition that the difference value between the theoretical power and the actual power exceeds a second preset threshold value, outputting a result of abnormal string combination.
2. A method of circulating current protection as claimed in claim 1, further comprising the steps of:
the circuit parameter information further comprises solar irradiance;
and under the condition that the irradiance is greater than a third preset threshold, judging whether the difference value between the theoretical output voltage of the combiner box and the actual output voltage of the combiner box is greater than a first preset threshold or not according to the circuit parameter information.
3. The circulating current protection method according to claim 1, wherein the method for calculating the average current is as follows:
obtaining an average current based on the current of each group string of the combiner box;
sequentially judging whether the difference value between the current of each group string and the average current exceeds a third preset threshold value or not;
under the condition that the difference value between the current of a certain circuit of string and the average current exceeds a third preset threshold value, deleting the current of the circuit of string, and recalculating the average current based on the currents of the other circuits of string;
and under the condition that the difference value between the current of each path of group string and the average current does not exceed a third preset threshold value, outputting the currently obtained average current for obtaining theoretical power.
4. A method of circulating current protection as claimed in claim 1, further comprising the steps of:
the circuit parameter information also comprises busbar temperature;
the busbar temperature monitoring module judges whether the busbar temperature exceeds a fourth preset threshold value;
and under the condition that the busbar temperature exceeds a fourth preset threshold, the busbar temperature monitoring module outputs a result of abnormal string forming.
5. The utility model provides a circulation protection device installs in the collection flow box, the collection flow box is including the communication board that is used for gathering real-time power and real-time current, its characterized in that includes:
the data acquisition module is used for acquiring the circuit parameter information of the combiner box;
the voltage difference analysis module is used for acquiring theoretical output voltage of the combiner box based on the circuit parameter information and judging whether the difference value between the theoretical output voltage and the actual output voltage of the combiner box is larger than a first preset threshold value or not;
the power difference analysis module is used for acquiring the average current of each path of group string in the combiner box and the theoretical power of the combiner box based on the circuit parameter information under the condition that the difference value between the theoretical output voltage and the actual voltage is larger than a first preset threshold value, and judging whether the difference value between the theoretical power and the actual power exceeds a second preset threshold value or not; and under the condition that the difference value between the theoretical power and the actual power exceeds a second preset threshold value, outputting a result of abnormal string combination.
6. A circulation protection device according to claim 5, further comprising: and the irradiance sensor is used for collecting the solar irradiance and sending the collected irradiance to the data acquisition module.
7. The device according to claim 5, wherein the power difference analysis module further comprises a current calculation unit for calculating an average current, the average current being used for calculating the theoretical power.
8. The circulating current protection device according to claim 5, further comprising a busbar temperature sensor and a busbar temperature monitoring module, wherein the busbar temperature sensor is used for acquiring the temperature of a busbar, and the busbar temperature monitoring module is used for judging whether the temperature of the busbar exceeds a fourth preset threshold value and outputting a result of abnormal string if the temperature of the busbar exceeds the fourth preset threshold value.
9. An electronic device, comprising:
a memory for storing a processing program;
a processor which, when executing the processing program, implements the circulation protection method according to any one of claims 1 to 4.
10. A readable storage medium, characterized in that the readable storage medium has stored thereon a processing program, which when executed by a processor implements the circulation protection method according to any one of claims 1 to 4.
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| CN112366751A (en) * | 2020-10-30 | 2021-02-12 | 阳光电源股份有限公司 | Photovoltaic system with components with different characteristics used in mixed mode |
| CN113162546A (en) * | 2021-04-27 | 2021-07-23 | 无锡尚德太阳能电力有限公司 | Photovoltaic power plant intelligent monitoring device and photovoltaic module system |
| CN113346787A (en) * | 2021-07-02 | 2021-09-03 | 太原理工大学 | Pqz theory-based parallel bidirectional power converter circulating current restraining method |
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