CN105785174A - Intelligent fault detection and data storage system for photovoltaic inverter - Google Patents
Intelligent fault detection and data storage system for photovoltaic inverter Download PDFInfo
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- CN105785174A CN105785174A CN201610138593.7A CN201610138593A CN105785174A CN 105785174 A CN105785174 A CN 105785174A CN 201610138593 A CN201610138593 A CN 201610138593A CN 105785174 A CN105785174 A CN 105785174A
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- 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
Abstract
The invention discloses an intelligent fault detection and data storage system for a photovoltaic inverter. The system is composed of a data acquisition storage structure, a fault waveform record monitoring structure and an A/D discrete data sampling processing structure. The data acquisition storage structure consists of a single-stage/double-stage main circuit topology unit, a sampling circuit, a digital signal processor and a memory chip. The fault waveform record monitoring structure includes a photovoltaic inverter power generation system, a 485/wireless/Ethernet network and a local or remote monitoring unit. And the A/D discrete data sampling processing structure includes an A/D discrete sampling signal, a processing data structure and a storage area. According to the invention, the black box function of the photovoltaic power generation system is realized; elimination of a fault of a photovoltaic inverter with the remote assistance is realized; defects of the conventional method are overcome; and the digital and intelligent degrees of the photovoltaic power generation system are improved.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter field, especially one photovoltaic inverter intelligent fault detect and data-storage system thereof.
Background technology
As the power inverter-photovoltaic DC-to-AC converter of most critical in photovoltaic generating system, be responsible for the unidirectional current exported by solar panel, be converted to can be grid-connected alternating current.The safe and reliable operation of inverter is directly connected to stablizing of whole electricity generation system, even has influence on the safety of regional distribution network network.When photovoltaic DC-to-AC converter breaks down time, it is necessary to quick diagnosis be out of order occur reason, shorten maintenance time as early as possible, reduce owner power generation loss, reduce the unstability factor of electrical network simultaneously.
When photovoltaic DC-to-AC converter breaks down, conventional way is simply to point out fault occurrence reason, such as essential informations such as overvoltage, under-voltage, overfrequency, under-frequency excess temperatures, and the instantaneous value such as voltage when having minority producer can accomplish the record trouble moment, frequency, temperature.When occurring due to fault, all kinds of secondary fault triggered by source can form a process dispersed, as A reason causes that A1, A2 produce, A11, A12, A13 is result in after A1, the rest may be inferred, therefore fault message A11, A12, A13 after dispersing only are just known that, where it is difficult to judge the origin of problem, additionally, photo-voltaic power generation station major part is built in lonely place, having inconvenient traffic profit, attendant is difficult to reach the spot in time, this give find in time, solution problem causes very big difficulty.
Summary of the invention
It is an object of the invention to provide a kind of digitized is high, intelligence degree is high photovoltaic inverter intelligent fault detect and data-storage system thereof, with the problem solving to propose in above-mentioned background technology.
For achieving the above object, the present invention provides following technical scheme:
A kind of photovoltaic inverter intelligent fault detect and data-storage system thereof, including data acquisition storage organization, fault waveform record monitoring structure and A/D discretization data sampling process structure, described data acquisition storage organization includes single-stage/twin-stage main circuit topology, sample circuit, digital signal processor and storage chip, described fault waveform record monitoring structure includes photovoltaic DC-to-AC converter electricity generation system, 485/ wireless/Ethernet and Local or Remote monitoring, described A/D discretization data sampling processes structure and includes A/D discrete sampling signal, handle data structures and memory block, described single-stage/twin-stage main circuit topology includes input cell plate voltage, electric current, busbar voltage, electric current, ambient temperature, IGBT temperature, exchange grid-connected survey inverter current, the data of line voltage and power network current.
Described photovoltaic inverter intelligent fault detect and data-storage system thereof, the method of its fault detect and storage thereof, comprise the steps: that single-stage/twin-stage main circuit topology processes structure through A/D discretization data sampling and carries out linear attenuation, nurse one's health into weak electric signal, after weak electric signal is carried out A/D sampling by A/D discrete sampling signal after digital signal processor processes, become digital signal, these digital signals are temporarily stored in memory block, every N number of civil power cycle stores in the storage chip of outside, N=1,2,3,4 ....
Compared with prior art, the invention has the beneficial effects as follows:
The present invention passes through the record to photovoltaic DC-to-AC converter service data and preservation, and real-time update data, these data are delivered to locally or remotely monitoring client by various means of communications, achieve the black box function of photovoltaic generating system, the failure problems being solved photovoltaic DC-to-AC converter by remote assistance is made to be possibly realized, compensate for the deficiency of Normal practice, improve the digitized of photovoltaic generating system, intelligence degree, simultaneously, the present invention makes full use of the existing equipment Foundations of photovoltaic DC-to-AC converter, only need upgrade data collection, process function both can realize, the cost of photovoltaic generating system need not be increased.
Accompanying drawing explanation
Fig. 1 is data acquisition storage organization schematic diagram in the present invention.
Fig. 2 is fault waveform record monitoring structure schematic diagram in the present invention.
Fig. 3 is that in the present invention, A/D discretization data sampling processes structural representation.
In figure: 101-single-stage/twin-stage main circuit topology；102-sample circuit；103-digital signal processor；104-storage chip；201-photovoltaic DC-to-AC converter electricity generation system；202-485/ is wireless/Ethernet；203-Local or Remote is monitored；301-A/D discrete sampling signal；302-handle data structures；303-memory block.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Refer to Fig. 1-3, in the embodiment of the present invention, a kind of photovoltaic inverter intelligent fault detect and data-storage system thereof, process structure including data acquisition storage organization, fault waveform record monitoring structure and A/D discretization data sampling.
Photovoltaic inverter intelligent fault detect and data-storage system thereof, the method of its fault detect and storage thereof, comprise the following steps: the service data of a kind of photovoltaic DC-to-AC converter main circuit, including input cell plate voltage, electric current, busbar voltage, electric current, ambient temperature, IGBT temperature, exchange grid-connected survey inverter current, line voltage, the data such as power network current, process structure through A/D discretization data sampling and carry out linear attenuation, nurse one's health into weak electric signal, after weak electric signal is carried out A/D sampling by A/D discrete sampling signal 301 after digital signal processor 103 processes, become digital signal, these digital signals are temporarily stored in memory block 303, every N number of civil power cycle stores in the storage chip 104 of outside, N=1, 2, 3, 4 ....
Referring to Fig. 1, described data acquisition storage organization includes single-stage/twin-stage main circuit topology 101, sample circuit 102, digital signal processor 103 and storage chip 104.
The DC inverter that solar panel is sent by single-stage or bipolar main circuit topology 101 becomes alternating current, single-stage or the preferred booster circuit of bipolar main circuit topology 101 and inverter bridge composition, and wherein, inverter bridge is two level block or three-level structure.
The data of input cell plate voltage when single-stage sampled by sample circuit 102 or bipolar main circuit topology 101 runs, electric current, busbar voltage, electric current, ambient temperature, IGBT temperature, the grid-connected survey inverter current of exchange, line voltage and power network current, these data, after ratio decays, become the small-signal of 0～3.3V or 0～5V for digital circuit.
Digital signal processor 103 is the master controller of photovoltaic generating system, and the signal after above-mentioned decay is via digital signal processor 103 by A/D sampling discretization, and the signal of sampling is saved in the RAM memory block of correspondence every time, as a relief area.
Storage chip 104 is erasable non-volatile memory chip.Owing to the ram space of digital signal processor 103 is limited, when power down, data can be lost simultaneously, therefore needs in the data conversion storage in the RAM district of digital signal processor 103 to storage chip 104 every N number of civil power cycle (N=1,2,3 ...).When fault occurs, continue to preserve the data in a civil power cycle, stop more new data afterwards, in order to avoid the data before fault generation are capped.
Refer to Fig. 2, described fault waveform record monitoring structure include photovoltaic DC-to-AC converter electricity generation system 201,485/ wireless/Ethernet 202 and Local or Remote monitoring 203.After fault occurs, photovoltaic DC-to-AC converter electricity generation system 201 be will be stored in data from digital signal processor in storage chip 104 103 and read by special SPI Serial Peripheral Interface (SPI) or I2C twin wire serial bus interface, carries out data transmission monitoring system 203 to Local or Remote by 485/ wireless/Ethernet 202 afterwards.The data of Local or Remote monitoring system 203 acquisition process structure by A/D discretization data sampling and realize display plotting function, reappear the data message of photovoltaic generating system record, thus obtaining fault in time front and back photovoltaic DC-to-AC converter operation conditions occurs.
Referring to Fig. 3, described A/D discretization data sampling processes structure and includes A/D discrete sampling signal 301, handle data structures 302 and memory block 303.
A/D discrete sampling signal 301 is the data of the photovoltaic inverter system input cell plate voltage after ratio decay, electric current, busbar voltage, electric current, ambient temperature, IGBT temperature, the grid-connected survey inverter current of exchange, line voltage and power network current.Choose a wherein road signal to be analyzed, remaining identical with this.
Analogue signal is carried out A/D sampling by A/D discrete sampling signal 301 after digital signal processor 103 processes, and becomes digital signal, and conversion method is as follows:
(1)
Wherein, DNUMFor A/D sampled value after discrete, Ratio is attenuation ratio, VrefFor digital signal processor 103 chip reference voltage level, routine is 3V,AC signal needs, and direct current signal does not need, and N is sampling precision, and routine is 12 precision.
Handle data structures 302 to above-mentioned discrete after digital signal DNUMIt is read out and stores, form a ring data structure and access pointer variable p → Start, p → Curr, p → EEprom that data structure uses.Wherein,
P → Start: the initial address of record storage area RAM；
P → Curr: be used for access storage areas 303 successively, when arriving the rearmost position of memory block 303, again from p → Start position；
P → EEprom: be used for writing in external digital signal processor 103 data timing in memory block 303.
The degree of depth N of memory block 303 is determined by following formula:
(2)
Wherein, the degree of depth of N-memory block 303, the civil power amount of cycles of K-buffer memory, the Tp-civil power cycle, FSW-sample frequency.
The photovoltaic DC-to-AC converter fault waveform recording method of present invention realization and monitoring system, there is the service data of front and back in real time record fault, when malfunction analyzed by needs, reappear photovoltaic DC-to-AC converter run time behaviour by visual software, provide convenience for solving a problem promptly.
The present invention passes through the record to photovoltaic DC-to-AC converter service data and preservation, and real-time update data, these data are delivered to locally or remotely monitoring client by various means of communications, achieve the black box function of photovoltaic generating system, the failure problems being solved photovoltaic DC-to-AC converter by remote assistance is made to be possibly realized, compensate for the deficiency of Normal practice, improve the digitized of photovoltaic generating system, intelligence degree, simultaneously, the present invention makes full use of the existing hardware foundation of photovoltaic DC-to-AC converter, only need upgrade data collection, process function both can realize, the cost of photovoltaic generating system need not be increased.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when without departing substantially from the spirit of the present invention or basic feature, it is possible to realize the present invention in other specific forms.Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the invention rather than described above limits, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in the present invention.Any accompanying drawing labelling in claim should be considered as the claim that restriction is involved.
In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.
Claims (2)
- null1. a photovoltaic inverter intelligent fault detect and data-storage system thereof，It is characterized in that，Including data acquisition storage organization、Fault waveform record monitoring structure and A/D discretization data sampling process structure，Described data acquisition storage organization includes single-stage/twin-stage main circuit topology (101)、Sample circuit (102)、Digital signal processor (103) and storage chip (104)，Described fault waveform record monitoring structure includes photovoltaic DC-to-AC converter electricity generation system (201)、485/ wireless/Ethernet (202) and Local or Remote monitoring (203)，Described A/D discretization data sampling processes structure and includes A/D discrete sampling signal (301)、Handle data structures (302) and memory block (303)，Described single-stage/twin-stage main circuit topology (101) includes input cell plate voltage、Electric current、Busbar voltage、Electric current、Ambient temperature、IGBT temperature、Exchange grid-connected survey inverter current、The data of line voltage and power network current.
- 2. the storage method of the fault detect adopting photovoltaic inverter intelligent fault detect as claimed in claim 1 and data-storage system thereof, it is characterized in that, specifically comprise the following steps that photovoltaic DC-to-AC converter single-stage/twin-stage main circuit topology (101), process structure through A/D discretization data sampling and carry out linear attenuation, nurse one's health into weak electric signal, weak electric signal becomes digital signal after being carried out A/D sampling by A/D discrete sampling signal (301) after digital signal processor (103) processes, these digital signals are temporarily stored in memory block (303), every N number of civil power cycle stores in the storage chip (104) of outside, N=1, 2, 3, 4 ....
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Cited By (5)
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| CN106603003A (en) * | 2017-01-06 | 2017-04-26 | 许继电气股份有限公司 | Wave recording method of photovoltaic inverter, photovoltaic power generation system and inverter |
| CN110097141A (en) * | 2019-06-04 | 2019-08-06 | 华北电力大学 | A kind of acquisition operational system intelligent trouble detection method |
| CN113381693A (en) * | 2021-07-20 | 2021-09-10 | 阳光电源股份有限公司 | Alternating current fault identification method for inverter and photovoltaic system |
| CN114091524A (en) * | 2021-10-15 | 2022-02-25 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Inverter fault early warning system and method |
| CN115175023A (en) * | 2022-09-07 | 2022-10-11 | 安徽南瑞中天电力电子有限公司 | Photovoltaic inverter-based method, system and device for reading meter of internet of things |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106603003A (en) * | 2017-01-06 | 2017-04-26 | 许继电气股份有限公司 | Wave recording method of photovoltaic inverter, photovoltaic power generation system and inverter |
| CN110097141A (en) * | 2019-06-04 | 2019-08-06 | 华北电力大学 | A kind of acquisition operational system intelligent trouble detection method |
| CN113381693A (en) * | 2021-07-20 | 2021-09-10 | 阳光电源股份有限公司 | Alternating current fault identification method for inverter and photovoltaic system |
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| CN113381693B (en) * | 2021-07-20 | 2024-04-12 | 阳光电源股份有限公司 | Alternating current fault identification method for inverter and photovoltaic system |
| CN114091524A (en) * | 2021-10-15 | 2022-02-25 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Inverter fault early warning system and method |
| CN115175023A (en) * | 2022-09-07 | 2022-10-11 | 安徽南瑞中天电力电子有限公司 | Photovoltaic inverter-based method, system and device for reading meter of internet of things |
| CN115175023B (en) * | 2022-09-07 | 2022-11-08 | 安徽南瑞中天电力电子有限公司 | Photovoltaic inverter-based method, system and device for reading meter of internet of things |
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Application publication date: 20160720 |