CN107247213B - Distributed power supply fuse state detection method and device of photovoltaic power generation system - Google Patents
Distributed power supply fuse state detection method and device of photovoltaic power generation system Download PDFInfo
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- CN107247213B CN107247213B CN201710499940.3A CN201710499940A CN107247213B CN 107247213 B CN107247213 B CN 107247213B CN 201710499940 A CN201710499940 A CN 201710499940A CN 107247213 B CN107247213 B CN 107247213B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/74—Testing of fuses
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Abstract
The invention discloses a distributed power supply fuse state detection method of a photovoltaic power generation system, which comprises the steps of S01, obtaining the voltage value of the output side of each converter; s02, acquiring an output direct current bus voltage value; s03, comparing the voltage value of the output side of each converter with the voltage value of the output direct-current bus; when the difference between the two is greater than or equal to the set threshold value, judging that the circuit fuse is broken; otherwise, it is normal. The invention also discloses a detection device, which comprises an acquisition module, a detection module and a control module, wherein the acquisition module is used for acquiring the voltage value of the output side of each converter; the calculation module is used for acquiring the voltage value of the output direct current bus; the judging module is used for comparing the voltage value of the output side of each converter with the voltage value of the output direct-current bus; and when the difference between the two is larger than or equal to the set threshold value, judging that the circuit fuse is broken. The distributed power supply fuse state detection method and device of the photovoltaic power generation system have the advantages of simplicity and convenience in operation, accuracy in detection, cost saving and the like.
Description
Technical Field
The invention mainly relates to the technical field of photovoltaic power generation, in particular to a method and a device for detecting the fuse state of a distributed power supply of a photovoltaic power generation system.
Background
The distributed photovoltaic power generation system integrates the advantages of stability of a traditional centralized grid-connected power generation system and multi-path MPPT control and large power generation amount of a string photovoltaic power generation system, and is a preferred photovoltaic power generation system form emerging in recent years. The system topology is shown in fig. 1 and comprises a photovoltaic array, a distributed power supply and a grid-connected inverter. The distributed power supply is a key component of the system, and the maximum power output control (MPPT) of the photovoltaic array is completed by a direct current/direct current boost converter in the device through PWM switching action. In order to obtain the maximum number of MPPT channels as much as possible and to increase the power generation amount of the system, a plurality of inverter modules are generally provided in the distributed power supply box, individually controlled, and merged at the output end to the dc bus. The output side of each DC/DC converter in the distributed power supply needs protection of a fuse. The fuse is a current protector made by using the principle that after the current exceeds a specified value for a period of time, the melt is melted by the heat generated by the fuse, so that the circuit is disconnected. The fusing state of the fuse is required to be detected in real time when the distributed power supply operates, if the fuse is fused, the distributed power supply is protected to be shut down, and meanwhile fault information of the fuse is displayed through a human-computer interaction interface.
The current state of the art for detecting the state of a fuse is generally the following two types:
firstly, the state of the fuse is judged through the state of a microswitch carried by the fuse. The method has the disadvantages that a fuse with a microswitch is required to be specially manufactured, a microswitch detection circuit is required to be added, the cost is high, and due to the addition of devices, the fault points of the system are correspondingly increased, and the stability and the reliability of the system are influenced in a certain procedure.
And secondly, the state of the fuse is judged by detecting the voltages at two ends of the fuse through a detection circuit. The method has the disadvantages that a plurality of detection circuits are required for the distributed power supply containing a plurality of direct current fuses, and the cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a distributed power supply fuse state detection method of a photovoltaic power generation system, which is simple and convenient to operate, accurate in detection and cost-saving, and correspondingly provides a distributed power supply fuse state detection device of the photovoltaic power generation system.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a distributed power supply fuse state detection method of a photovoltaic power generation system comprises the following steps:
s01, acquiring a voltage value of an output side of each converter in the distributed power supply;
s02, acquiring the voltage value of the internal output direct current bus of the distributed power supply;
s03, comparing the voltage value of the output side of each converter with the voltage value of the output direct-current bus; when the difference between the two is greater than or equal to the set threshold value, judging that the circuit fuse is broken; otherwise, it is normal.
As a further improvement of the above technical solution:
the specific process of step S02 is as follows: and summing the voltage values of the output sides of all the converters, and then averaging to obtain the voltage value of the output direct-current bus.
The specific process of step S02 is as follows: and removing the maximum value and the minimum value in the voltage values of the output sides of all the converters, and then summing and averaging to obtain the voltage value of the output direct-current bus.
In step S01, the voltage value of the corresponding output side is collected by an output voltage detection circuit inside the converter.
And acquiring the voltage value acquired by the output voltage detection circuit through an MPPT controller in the converter.
And acquiring the voltage value acquired by the output voltage detection circuit through an upper system controller in the distributed power supply.
The invention also correspondingly discloses a distributed power supply fuse state detection device of the photovoltaic power generation system, which comprises the following components:
the acquisition module is used for acquiring the voltage value of the output side of each converter in the distributed power supply;
the calculation module is used for acquiring the voltage value of the internal output direct current bus of the distributed power supply;
the judging module is used for comparing the voltage value of the output side of each converter with the voltage value of the output direct-current bus; when the difference between the two is greater than or equal to the set threshold value, judging that the circuit fuse is broken; otherwise, it is normal.
As a further improvement of the above technical solution:
the calculation module comprises a first submodule and is used for summing voltage values of output sides of all the converters and then averaging to obtain an output direct-current bus voltage value.
The calculation module comprises a second submodule and is used for removing the maximum value and the minimum value in the voltage values of the output sides of all the converters, and then summing and averaging the maximum value and the minimum value to obtain the voltage value of the output direct-current bus.
The acquisition module comprises an output voltage detection circuit inside the converter.
Compared with the prior art, the invention has the advantages that:
according to the fuse state detection method and device of the photovoltaic power generation system, the voltage value of the output side of each converter is compared with the voltage value of the output direct-current bus, the state of the fuse is judged according to the comparison result, the operation is simple and convenient, the detection is reliable, and the cost is saved.
Drawings
Fig. 1 is a topological diagram of a conventional distributed photovoltaic power generation system.
FIG. 2 is a flow chart of the method of the present invention.
Fig. 3 is a block diagram of the MPPT controller in the converter of the present invention acquiring the voltage value collected by the output voltage detection circuit.
Fig. 4 is a block diagram of the upper system controller in the distributed power supply according to the present invention acquiring the voltage value collected by the output voltage detection circuit.
Fig. 5 is a flowchart of a method for obtaining an output dc bus voltage according to an embodiment of the present invention.
Fig. 6 is a flowchart of a method for obtaining an output dc bus voltage according to a second embodiment of the present invention.
Fig. 7 is a flowchart of the method of step S03 in the present invention.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
The first embodiment is as follows:
as shown in fig. 2 to 7, the method for detecting the fuse state of the distributed power supply of the photovoltaic power generation system of the embodiment includes the following steps:
s01, acquiring a voltage value of the output side of each converter (direct current/direct current converter) in the distributed power supply;
s02, acquiring the voltage value of the internal output direct current bus of the distributed power supply;
s03, comparing the voltage value of the output side of each converter (DC/DC converter) with the voltage value of the output DC bus; when the difference between the two is greater than or equal to the set threshold value, judging that the circuit fuse is broken; otherwise, it is normal.
According to the fuse state detection method of the photovoltaic power generation system, the voltage value of the output side of each converter is compared with the voltage value of the output direct-current bus, the state of the fuse is judged according to the comparison result, the operation is simple and convenient, the detection is reliable, and the cost is saved.
In this embodiment, since each dc/dc converter converges to the output dc bus at the output terminal through the fuse, and the voltage drop at the two terminals of the fuse is small under normal conditions, the estimated value of the output dc bus voltage can be obtained by calculating the voltage value at the output side of each dc/dc converter according to the circuit structure. As shown in fig. 5, the specific process of step S02 is as follows: and summing the voltage values of the output sides of all the direct current/direct current converters, and then averaging to obtain an output direct current bus voltage value (estimated value). The step can be completed by an MPPT controller in each DC/DC converter or an upper-layer system controller in the distributed power supply.
In this embodiment, since each dc/dc converter in the distributed power supply includes an output voltage detection circuit, in step S01, the output voltage detection circuit in the dc/dc converter collects the voltage value of the corresponding output side. This step implementation differs for different control system distributed power supplies, for example: 1. each dc/dc converter in the distributed power supply includes a controller, each controller is connected via a communication line, and each dc/dc converter obtains the voltage value of the output side of another dc/dc converter via communication, as shown in fig. 3. 2. The distributed power supply includes an upper system controller, and the system controller obtains a voltage value of an output side of each dc/dc converter in real time, as shown in fig. 4.
In this embodiment, step S03 may be completed by the MPPT controller inside each dc/dc converter, or may be completed by the upper system controller inside the distributed power supply, as shown in fig. 7.
The distributed power supply fuse state detection method of the photovoltaic power generation system judges whether the fuse is fused or not according to the comparison result of the voltage value of the output side of each direct current/direct current converter in the distributed power supply and the voltage value of the output direct current bus. Because the voltage drop at two ends of the direct current fuse is smaller under the normal condition, and each direct current/direct current converter is converged to the output direct current bus at the output end through the fuse, the voltage value of the output side of each direct current/direct current converter is basically consistent under the normal condition, and the difference between the voltage value of the output side of each direct current/direct current converter and the voltage value of the output direct current bus is smaller than the set threshold value; when the fuse connected with the output side of a certain DC/DC converter is fused, the output side of the DC/DC converter is suspended, so that a voltage difference exists between the output side of the DC/DC converter and the output sides of other DC/DC converters, the difference between the voltage value of the output side of the DC/DC converter and the voltage value of an output DC bus is larger than or equal to a set threshold value, and the judgment of the fusing of the fuse on the output side of the DC/DC converter is obtained. In addition, because each DC/DC converter in the distributed power supply already comprises an output voltage detection circuit, a control system in the distributed power supply also comprises a data transmission line, and other steps are completed by controller software, the method is realized without increasing the cost of the distributed power supply system.
Example two:
the present embodiment is different from the first embodiment only in that: as shown in fig. 6, the specific process of step S02 is: and removing the maximum value and the minimum value in the voltage values of the output sides of all the direct current/direct current converters, and then summing and averaging to obtain an output direct current bus voltage value (estimated value). Other details are the same as those in the first embodiment and are not described herein again.
The invention also correspondingly discloses a distributed power supply fuse state detection device of the photovoltaic power generation system, which comprises the following components:
the acquisition module is used for acquiring the voltage value of the output side of each converter in the distributed power supply;
the calculation module is used for acquiring the voltage value of the internal output direct current bus of the distributed power supply;
the judging module is used for comparing the voltage value of the output side of each converter with the voltage value of the output direct-current bus; when the difference between the two is greater than or equal to the set threshold value, judging that the circuit fuse is broken; otherwise, it is normal.
In this embodiment, the calculation module includes a first sub-module, and is configured to sum voltage values at output sides of all the converters, and then average the voltage values to obtain an output dc bus voltage value.
In this embodiment, the calculation module includes a second sub-module, which is configured to remove the maximum value and the minimum value of the voltage values at the output sides of all the converters, and then sum and average the voltage values to obtain the output dc bus voltage value.
Certainly, in other embodiments, the distributed power supply fuse state detection apparatus of the photovoltaic power generation system of the present invention may be implemented by using a hardware entity, for example, the obtaining module may use an output voltage detection circuit inside the converter, the calculating module may use an original detection circuit of the photovoltaic power generation system, and the determining module may use a comparator and other components.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (9)
1. A distributed power supply fuse state detection method of a photovoltaic power generation system is characterized by comprising the following steps:
s01, acquiring a voltage value of an output side of each converter in the distributed power supply;
s02, acquiring the voltage value of the internal output direct current bus of the distributed power supply;
s03, comparing the voltage value of the output side of each converter with the voltage value of the output direct-current bus; when the difference between the two is greater than or equal to the set threshold value, judging that the circuit fuse is broken; otherwise, the operation is normal;
in step S01, the voltage value of the corresponding output side is collected by an output voltage detection circuit inside the converter.
2. The method for detecting the fuse state of a distributed power supply of a photovoltaic power generation system according to claim 1, wherein the specific process of step S02 is as follows: and summing the voltage values of the output sides of all the converters, and then averaging to obtain the voltage value of the output direct-current bus.
3. The method for detecting the fuse state of a distributed power supply of a photovoltaic power generation system according to claim 1, wherein the specific process of step S02 is as follows: and removing the maximum value and the minimum value in the voltage values of the output sides of all the converters, and then summing and averaging to obtain the voltage value of the output direct-current bus.
4. The distributed power fuse state detection method of a photovoltaic power generation system according to claim 1, wherein the voltage value acquired by the output voltage detection circuit is acquired by an MPPT controller inside the converter.
5. The method for detecting the fuse state of a distributed power supply of a photovoltaic power generation system according to claim 1, wherein the voltage value collected by the output voltage detection circuit is obtained by an upper system controller in the distributed power supply.
6. The utility model provides a distributed power supply fuse state detection device of photovoltaic power generation system which characterized in that includes:
the acquisition module is used for acquiring the voltage value of the output side of each converter in the distributed power supply;
the calculation module is used for acquiring the voltage value of the internal output direct current bus of the distributed power supply;
the judging module is used for comparing the voltage value of the output side of each converter with the voltage value of the output direct-current bus; when the difference between the two is greater than or equal to the set threshold value, judging that the circuit fuse is broken; otherwise, it is normal.
7. The distributed power fuse state detection device of a photovoltaic power generation system as claimed in claim 6, wherein the calculation module comprises a first sub-module for summing the voltage values of the output sides of all the converters and then averaging to obtain the output DC bus voltage value.
8. The distributed power fuse state detection device of a photovoltaic power generation system as claimed in claim 6, wherein the calculation module comprises a second sub-module for removing the maximum and minimum values of the voltage values at the output side of all the converters, and then summing and averaging to obtain the output DC bus voltage value.
9. The distributed power fuse state detection apparatus of a photovoltaic power generation system according to claim 6, 7 or 8, wherein the acquisition module includes an output voltage detection circuit inside the converter.
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| CN101546902A (en) * | 2008-03-24 | 2009-09-30 | 茗熔集团有限公司 | Device for monitoring working state of fuse |
| US8427173B2 (en) * | 2009-04-23 | 2013-04-23 | Toshiba International Corporation | Open fuse detection by neutral point shift |
| CN201897627U (en) * | 2010-11-16 | 2011-07-13 | 株洲科瑞变流电气有限公司 | Fast-acting fuse detector |
| CN102156243B (en) * | 2011-03-16 | 2016-08-10 | 艾默生网络能源有限公司 | The detection method of a kind of state of power unit fuse and device |
| CN102288908B (en) * | 2011-07-22 | 2013-04-03 | 重庆大学 | Fault monitoring device and fault judgment method for measurement potential transformer (PT) fuse |
| CN102608492B (en) * | 2012-03-31 | 2014-05-14 | 广东易事特电源股份有限公司 | System and method for detecting fuse state of combiner box |
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