CN111208446A - Photovoltaic inverter running state on-line monitoring device and photovoltaic inverter system - Google Patents
Photovoltaic inverter running state on-line monitoring device and photovoltaic inverter system Download PDFInfo
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- CN111208446A CN111208446A CN202010111908.5A CN202010111908A CN111208446A CN 111208446 A CN111208446 A CN 111208446A CN 202010111908 A CN202010111908 A CN 202010111908A CN 111208446 A CN111208446 A CN 111208446A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 26
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000012544 monitoring process Methods 0.000 claims abstract description 32
- 230000003750 conditioning effect Effects 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 15
- 230000001939 inductive effect Effects 0.000 claims abstract description 3
- 238000004146 energy storage Methods 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- 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
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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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
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- 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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Inverter Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses an online monitoring device for the running state of a photovoltaic inverter and a photovoltaic inverter system, which belong to the technical field of photovoltaic, are used for solving the problems of large power consumption, short distance, complex wiring and the like of the conventional photovoltaic inverter monitoring, and comprise a sensing layer, a network layer and an application layer; the sensing layer comprises an LoRa monitoring module, and the LoRa monitoring module comprises a current sensor, a signal conditioning circuit, an LoRa transmitting module, an energy taking module and a power management module; the current sensor is used for detecting the output current of the photovoltaic inverter; the signal conditioning circuit is used for processing the output current detected by the current sensor; the LoRa transmitting module is used for transmitting the output current to the network layer so as to transmit the output current to the application layer for analysis; the energy taking module is used for inducing electric energy from the output end of the inverter and transmitting the electric energy to the power management module, and the power management module is used for storing the electric energy and providing electric energy for the signal conditioning circuit and the LoRa transmitting module. The invention has the advantages of small power consumption, long communication distance, no need of wiring, self power supply and the like.
Description
Technical Field
The invention mainly relates to the technical field of photovoltaic, in particular to a photovoltaic inverter running state online monitoring device and a photovoltaic inverter system.
Background
In recent years, the photovoltaic industry has rapidly developed. Among them, power electronic equipment is one of basic equipment in the photovoltaic industry, and research on operating characteristics of power electronic equipment has become an important direction. The inverter is a core device of the solar power generation technology and directly reflects the operation condition of the power generation system, so that the inverter has important practical significance for online monitoring of the operation of the inverter. In the working process of the inverter, a switching device of the inverter is most prone to failure, and once the switching device fails, the current on the direct current output side is directly influenced. Therefore, the current of the direct current output side of the inverter is monitored, and the data can reflect whether the running state of the inverter is normal or not. In order to reduce the probability of occurrence of faults in the solar power generation process, the stable operation of the photovoltaic inverter needs to be monitored on line. The traditional inverter monitoring technology has the following defects: (1) the communication power consumption is large; (2) the communication distance is short; (3) wired monitoring is complex to wire.
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 photovoltaic inverter running state online monitoring device which is long in distance, low in power consumption and self-powered, and a photovoltaic inverter.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a photovoltaic inverter running state online monitoring device comprises a sensing layer, a network layer and an application layer; the sensing layer comprises an LoRa monitoring module, and the LoRa monitoring module comprises a current sensor, a signal conditioning circuit, a LoRa transmitting module, an energy taking module and a power management module; the current sensor, the signal conditioning circuit and the LoRa transmitting module are sequentially connected; the current sensor is used for detecting the output current of the photovoltaic inverter; the signal conditioning circuit is used for processing the output current detected by the current sensor and sending the output current to the LoRa transmitting module; the LoRa transmitting module is used for sending the output current to the network layer to be transmitted to the application layer for analysis; the energy taking module is used for inducing electric energy from the output end of the inverter and transmitting the electric energy to the power supply management module, and the power supply management module is used for storing the electric energy and providing the electric energy for the signal conditioning circuit and the LoRa transmitting module.
As a further improvement of the above technical solution:
the power management module comprises a matching circuit, a rectifying circuit, an energy storage element and a voltage stabilizing circuit which are connected in sequence, wherein a control switch is arranged between the energy storage element and the voltage stabilizing circuit and is used for automatically starting when the voltage of the energy storage element reaches a preset control voltage.
The energy storage element is a super capacitor.
The energy taking module comprises a magnetic core and an energy taking coil, the magnetic core is sleeved on a cable at the output end of the inverter, and the energy taking coil is wound on the magnetic core.
The current sensor comprises a Hall element, a notch is arranged on the magnetic core, and the Hall element is positioned at the notch; the Hall element is used for measuring the magnetic induction intensity to obtain a current value to be measured.
The number of the current sensors is three, and the three current sensors are respectively located at the three-phase output end of the photovoltaic inverter.
The network layer comprises an LoRa gateway and a server which are connected in sequence; the LoRa gateway is connected with the server through a 4G signal or a 5G signal or an Ethernet.
The application layer comprises a computer processing unit and a monitoring state prediction unit, the computer processing unit is used for processing the output current, and the monitoring state prediction unit is used for predicting the operation state of the inverter according to the output current.
The application layer further comprises a remote monitoring system for remotely monitoring the operation state of the inverter.
The invention also discloses a photovoltaic inverter system, which comprises the photovoltaic inverter and the online monitoring device for the running state of the photovoltaic inverter.
Compared with the prior art, the invention has the advantages that:
the photovoltaic inverter running state online monitoring device and the photovoltaic inverter system are based on the LoRa spread spectrum communication technology, the LoRa communication technology is used in the field of inverter monitoring, and the photovoltaic inverter running state online monitoring device and the photovoltaic inverter system have the characteristics of long distance and low power consumption; the method has the advantages that the current data of the direct current side (output side) of the inverter are obtained in real time, the data are transmitted to computer software, and the running state of the inverter is obtained through noise reduction and filtering processing, so that the running state of the photovoltaic inverter is monitored, faults can be processed in time or the photovoltaic inverter is adjusted before the faults occur, and the fault occurrence probability in the solar power generation process is reduced; the LoRa communication is wireless communication, and complex wiring is not needed; LoRa communication has the characteristic of low power consumption and long service life of a battery; and the energy taking module is adopted to carry out self-power supply on each part, so that additional power supply and wiring are not required to be provided, and the simplicity and convenience of device installation are further improved.
Drawings
Fig. 1 is a block configuration diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of the operation of the hall element of the present invention.
Fig. 3 is a structural diagram of an LoRa monitoring module according to an embodiment of the present invention.
Fig. 4 is a structural diagram of an LoRa transmitting module according to an embodiment of the present invention.
FIG. 5 is a block diagram of an embodiment of a power management module of the present invention.
Fig. 6 is a schematic circuit diagram of an exemplary LoRa transmitter module according to the present invention.
The reference numbers in the figures denote: 1. a sensing layer; 101. a LoRa monitoring module; 102. a current sensor; 103. a signal conditioning circuit; 104. a LoRa transmitting module; 105. an energy obtaining module; 1051. a magnetic core; 1052. an energy-taking coil; 106. a power management module; 1061. a matching circuit; 1062. a rectifying circuit; 1063. an energy storage element; 1064. a voltage stabilizing circuit; 1065. a control switch; 2. a network layer; 201. an LoRa gateway; 202. a server; 3. an application layer; 301. a computer processing unit; 302. and a monitoring state prediction unit.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1, the photovoltaic inverter operation state online monitoring device of the present embodiment includes a sensing layer 1, a network layer 2, and an application layer 3; the sensing layer 1 comprises an LoRa monitoring module 101, wherein the LoRa monitoring module 101 comprises a current sensor 102, a signal conditioning circuit 103, a LoRa transmitting module 104, an energy obtaining module 105 and a power management module 106; the current sensor 102, the signal conditioning circuit 103 and the LoRa transmitting module 104 are connected in sequence; the current sensor 102 is used for detecting the three-phase output current of the photovoltaic inverter; the signal conditioning circuit 103 is configured to perform modulation and demodulation processing on the output current detected by the current sensor 102, and send the output current to the LoRa transmitting module 104; the LoRa transmitting module 104 is configured to send the output current to the network layer 2 to be transmitted to the application layer 3 for analysis, so as to obtain an operating state of the inverter; the energy obtaining module 105 is configured to induce electric energy from the output end of the inverter and transmit the electric energy to the power management module 106, and the power management module 106 is configured to store the electric energy and provide the electric energy for the signal conditioning circuit 103 and the LoRa transmitting module 104, so as to realize self-power supply of the LoRa monitoring module 101.
The photovoltaic inverter running state online monitoring device disclosed by the invention is based on the LoRa spread spectrum communication technology, uses the LoRa communication technology in the inverter monitoring field, and has the characteristics of long distance and low power consumption; the method has the advantages that the current data of the direct current side (output side) of the inverter are obtained in real time, the data are transmitted to computer software, and the running state of the inverter is obtained through noise reduction and filtering processing, so that the running state of the photovoltaic inverter is monitored, faults can be processed in time or the photovoltaic inverter is adjusted before the faults occur, and the fault occurrence probability in the solar power generation process is reduced; the LoRa communication is wireless communication, and complex wiring is not needed; LoRa communication has the characteristic of low power consumption and long service life of a battery; moreover, the energy-taking module 105 is adopted to carry out self-power supply on each part, so that additional power supply and wiring are not required to be provided, and the simplicity and convenience of device installation are further improved.
In this embodiment, the energy obtaining module 105 includes a magnetic core 1051 and an energy obtaining coil 1052, the magnetic core 1051 is sleeved on the cable at the output end of the inverter, and the energy obtaining coil 1052 is wound on the magnetic core 1051; the current sensor 102 includes a hall element, and the magnetic core 1051 is provided with a notch, and the hall element is located at the notch. The hall element is made using the hall effect and is placed in a magnetic field, as shown in fig. 2, with the hall element (1, 2) passing a current I and the other side (3, 4) generating a hall electromotive force. The Hall element further deduces the current value to be measured through measuring the magnetic induction intensity. As shown in fig. 4, the number of the hall elements is three, and the hall elements are respectively mounted on three-phase output terminals (a phase, b phase, and c phase) of the inverter, so that the output current of the inverter can be comprehensively monitored. The energy-taking coil 1052 stores the induced electric energy in the power management module 106, and then the power management module 106 supplies power to the signal conditioning circuit 103 and the LoRa transmitting module 104.
Specifically, as shown in fig. 5, the power management module 106 includes a matching circuit 1061, a rectifying circuit 1062, an energy storage element 1063, and a voltage stabilizing circuit 1064, which are connected in sequence, where a control switch 1065 is disposed between the energy storage element 1063 and the voltage stabilizing circuit 1064, and the electric energy induced by the energy-obtaining coil 1052 passes through the matching circuit 1061 and the rectifying circuit 1062 to charge the energy storage element 1063 (e.g., the super capacitor C), and when the voltage of the super capacitor C reaches a preset control voltage, the control switch 1065 is turned on, and the super capacitor C provides a constant working voltage for each component through the voltage stabilizing circuit 1064.
In this embodiment, the LoRa transmitter module 104 is an SX1278 wireless module, and its antenna impedance is affected by various factors, including installation angle, housing, and floor. As shown in fig. 6, when the antenna deviates from the normal range, it is corrected to a normal value. Generally, the antenna impedance is about 50 Ω, and C17 and C18 in fig. 6 can be implemented without welding; l2 can be 220pF capacitor or 1nH inductor, 0 resistor. Only in special cases, matching adjustments occur, such as inside the antenna mold, small antenna volume, or increased higher harmonic suppression.
In this embodiment, the network layer 2 includes an LoRa gateway 201 and a server 202 connected in sequence; the LoRa gateway 201 is connected to the server 202 through 4G signals, 5G signals, or ethernet. The application layer 3 includes a computer processing unit 301 for processing the output current and a monitoring state prediction unit 302 for predicting the operation state of the inverter from the output current, the monitoring state prediction unit 302. In the embodiment, the system further comprises a remote monitoring system for remotely monitoring the running state of the inverter; through GPRS signal or 4G signal, upload the state parameter of dc-to-ac converter to the high in the clouds, fortune dimension personnel or householder pass through the operation state of remote monitoring system remote monitoring each place dc-to-ac converter.
According to the photovoltaic inverter operation state online monitoring device, all parts are arranged in a modularized mode, so that the photovoltaic inverter operation state online monitoring device is convenient to install and maintain, simple and convenient to operate and flexible in use mode. The LoRa in the invention is Long Range Radio (Long Range Radio), which is characterized in that the distance of the Radio is longer than that of other Radio modes under the same power consumption condition, thereby realizing the unification of low power consumption and Long distance, and the distance of the Radio is enlarged by 3-5 times than that of the traditional Radio frequency communication under the same power consumption condition.
The invention also discloses a photovoltaic inverter system, which comprises the photovoltaic inverter and the photovoltaic inverter running state online monitoring device. The photovoltaic inverter system of the invention has the advantages of the online monitoring device as mentioned above due to the online monitoring device as mentioned above.
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 (10)
1. The photovoltaic inverter running state online monitoring device is characterized by comprising a sensing layer (1), a network layer (2) and an application layer (3); the sensing layer (1) comprises an LoRa monitoring module (101), wherein the LoRa monitoring module (101) comprises a current sensor (102), a signal conditioning circuit (103), a LoRa transmitting module (104), an energy taking module (105) and a power management module (106); the current sensor (102), the signal conditioning circuit (103) and the LoRa transmitting module (104) are connected in sequence; the current sensor (102) is used for detecting the output current of the photovoltaic inverter; the signal conditioning circuit (103) is used for processing the output current detected by the current sensor (102) and sending the output current to the LoRa transmitting module (104); the LoRa transmission module (104) is used for sending the output current to the network layer (2) to be transmitted to the application layer (3) for analysis; the energy taking module (105) is used for inducing electric energy from the output end of the inverter and transmitting the electric energy to the power management module (106), and the power management module (106) is used for storing the electric energy and providing the electric energy for the signal conditioning circuit (103) and the LoRa transmitting module (104).
2. The photovoltaic inverter operation state online monitoring device according to claim 1, wherein the power management module (106) comprises a matching circuit (1061), a rectifying circuit (1062), an energy storage element (1063) and a voltage stabilizing circuit (1064) which are connected in sequence, and a control switch (1065) is arranged between the energy storage element (1063) and the voltage stabilizing circuit (1064) and is configured to be automatically turned on when the voltage of the energy storage element (1063) reaches a preset control voltage.
3. The photovoltaic inverter operation state online monitoring device according to claim 2, wherein the energy storage element (1063) is a super capacitor.
4. The photovoltaic inverter operation state online monitoring device according to claim 1, 2 or 3, wherein the energy-taking module (105) comprises a magnetic core (1051) and an energy-taking coil (1052), the magnetic core (1051) is sleeved on a cable at the output end of the inverter, and the energy-taking coil (1052) is wound on the magnetic core (1051).
5. The photovoltaic inverter running state online monitoring device according to claim 4, wherein the current sensor (102) comprises a Hall element, a notch is arranged on the magnetic core (1051), and the Hall element is located at the notch; the Hall element is used for measuring the magnetic induction intensity to obtain a current value to be measured.
6. The photovoltaic inverter operation state online monitoring device according to claim 1, 2 or 3, wherein the number of the current sensors (102) is three, and the three current sensors are respectively positioned at three-phase output ends of the photovoltaic inverter.
7. The photovoltaic inverter operation state online monitoring device according to claim 1, 2 or 3, wherein the network layer (2) comprises an LoRa gateway (201) and a server (202) which are connected in sequence; the LoRa gateway (201) is connected with the server (202) through a 4G signal or a 5G signal or an Ethernet.
8. The photovoltaic inverter operation state online monitoring device according to claim 1, 2 or 3, wherein the application layer (3) comprises a computer processing unit (301) and a monitoring state prediction unit (302), the computer processing unit (301) is used for processing the output current, and the monitoring state prediction unit (302) is used for predicting the operation state of the inverter according to the output current.
9. The photovoltaic inverter operation state online monitoring device according to claim 8, wherein the application layer (3) further comprises a remote monitoring system for remotely monitoring the operation state of the inverter.
10. A photovoltaic inverter system comprises a photovoltaic inverter and is characterized by further comprising the photovoltaic inverter operation state online monitoring device as claimed in any one of claims 1-9.
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| CN202010111908.5A CN111208446A (en) | 2020-02-24 | 2020-02-24 | Photovoltaic inverter running state on-line monitoring device and photovoltaic inverter system |
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| CN202010111908.5A CN111208446A (en) | 2020-02-24 | 2020-02-24 | Photovoltaic inverter running state on-line monitoring device and photovoltaic inverter system |
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2020
- 2020-02-24 CN CN202010111908.5A patent/CN111208446A/en active Pending
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| CN102395891A (en) * | 2009-03-16 | 2012-03-28 | 艾思玛太阳能技术股份公司 | Method and device for the isolation monitoring of an it network |
| DE202012007257U1 (en) * | 2012-07-26 | 2013-10-28 | Ellenberger & Poensgen Gmbh | Device for safely switching a photovoltaic system |
| CN108879947A (en) * | 2018-06-06 | 2018-11-23 | 华南理工大学 | A kind of distributed photovoltaic power generation Control management system based on deep learning algorithm |
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Application publication date: 20200529 |