CN113644692A - Photovoltaic grid-connected anti-reverse power supply protection system - Google Patents
Photovoltaic grid-connected anti-reverse power supply protection system Download PDFInfo
- Publication number
- CN113644692A CN113644692A CN202111022418.9A CN202111022418A CN113644692A CN 113644692 A CN113644692 A CN 113644692A CN 202111022418 A CN202111022418 A CN 202111022418A CN 113644692 A CN113644692 A CN 113644692A
- Authority
- CN
- China
- Prior art keywords
- photovoltaic grid
- grid
- communication module
- photovoltaic
- protection system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004891 communication Methods 0.000 claims abstract description 54
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 15
- 229910001416 lithium ion Inorganic materials 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 7
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims description 4
- 230000008030 elimination Effects 0.000 claims description 2
- 238000003379 elimination reaction Methods 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
Abstract
The invention discloses a photovoltaic grid-connected anti-reverse power supply protection system which comprises a disconnecting device, an anti-islanding protection device and a live warning device. The photovoltaic grid-connected anti-reverse power supply protection system provided by the invention can quickly cut off the distributed isolated photovoltaic grid-connected point when an isolated island phenomenon occurs, has the functions of integrating switching equipment, protection, measurement and control, communication and the like required by the distributed photovoltaic grid-connected point grid connection, meets the requirements of isolated island detection, automatic safety grid connection, protection, safety isolation and the like of the distributed photovoltaic grid-connected point access, can protect the safety of personnel and electric equipment, can automatically detect whether residual current of more than 1A passes through a distribution line by a synchronously installed electrified warning device, alarms through a buzzer and an LED alarm lamp in real time, carries out all-round distribution and control on each node in the grid-connected system, forms an integrated safety and technical guarantee measure, really realizes the personal safety guarantee of distribution line maintainers, and improves the safe and stable operation of the grid-connected system.
Description
Technical Field
The invention relates to the technical field of grid-connected power supply, in particular to a photovoltaic grid-connected anti-reverse power supply protection system.
Background
In recent years, distributed new energy power generation keeps a continuously increasing situation by virtue of economy and effectiveness, and the access of the distributed new energy power generation to a power distribution network also brings a series of problems to a power grid, wherein 'islanding' is one of the most widely researched subjects at present. Once islanding occurs, problems such as personal safety, economic efficiency, power quality, etc. may be caused. According to the standard, the inverter is required to be incorporated into a power distribution network with the voltage level of 10KV and below, and the power distribution network has an anti-islanding protection function. If the power supply of the power grid incorporated by the inverter is interrupted, the inverter stops supplying power to the power grid within 2s, and simultaneously sends out a warning signal.
The existing photovoltaic grid-connected anti-reverse power supply protection system also has the following problems: the rapidity of protection action and the accuracy of control are difficult to ensure when an islanding phenomenon occurs; when an island phenomenon occurs, the distributed island photovoltaic grid-connected point cannot be cut off quickly, functions such as switch equipment, protection, measurement and control and communication required by integration of the distributed photovoltaic grid-connected point are not provided, island detection, automatic safety grid connection, protection, safety isolation and the like of connection of the distributed photovoltaic grid-connected point are difficult to meet, meanwhile, the fault photovoltaic grid-connected point cannot be cut off quickly in a very short time, the safety of people and electric equipment cannot be protected, the fact that whether residual current above 1A passes through a distribution line cannot be detected automatically, real-time alarming is difficult to carry out, all-around distribution and control are not carried out on each node in a grid-connected system, integrated safety and technical guarantee measures are not formed, personal safety guarantee of distribution line maintainers is difficult to achieve really, and safe and stable operation of the grid-connected system is influenced.
Disclosure of Invention
The invention aims to provide a photovoltaic grid-connected anti-reverse power supply protection system, which aims to solve the problem that in the prior art, the rapidity of protection action and the accuracy of control are difficult to ensure when an islanding phenomenon occurs; when an island phenomenon occurs, the distributed island photovoltaic grid-connected point cannot be cut off quickly, functions such as switch equipment, protection, measurement and control and communication required by integration of the distributed photovoltaic grid-connected point are not provided, island detection, automatic safety grid connection, protection, safety isolation and the like of distributed photovoltaic grid-connected point access are difficult to meet, meanwhile, fault photovoltaic grid-connected points are difficult to cut off quickly in a very short time, the safety of people and electric equipment cannot be protected, the fact that whether residual current above 1A passes through a distribution line cannot be detected automatically, real-time alarming is difficult to conduct, all-around distribution and control are not conducted on nodes in a grid-connected system, integrated safety and technical guarantee measures are not formed, the personal safety guarantee of distribution line maintainers is difficult to achieve really, and the problem of safe and stable operation of the grid-connected system is influenced.
In order to achieve the above object, the present invention provides a photovoltaic grid-connected anti-reverse power supply protection system, including:
the cutting device is used for rapidly cutting off a fault photovoltaic grid connection point in a very short time so as to protect the safety of human bodies and electric equipment;
the anti-islanding protection device is used for controlling the cut-off device to cut off the failed photovoltaic grid-connected point or to access the photovoltaic grid-connected point again for failure elimination;
electrified warning device for the photovoltaic grid connection point that detects the disconnection has residual current more than 1A, and send alarm signal warning maintainer to notice residual current when detecting the photovoltaic grid connection point that cuts off has residual current more than 1A, in order to guarantee maintainer life safety.
Optionally, the cut-off device includes a special photovoltaic grid-connected switch, the special photovoltaic grid-connected switch is suitable for a line with an alternating current of 50Hz, a rated voltage of four levels of 400V, and a rated current of 63-800A, and when a human body gets an electric shock or a leakage current of a photovoltaic grid-connected point exceeds a specified value, the special photovoltaic grid-connected switch rapidly cuts off a fault power supply in a very short time so as to protect the safety of the human body and electric equipment.
Optionally, the anti-islanding protection device comprises a front panel, a display screen, an operation key, a box body, two rubber bases, a main control board, a high-performance processor, an a/D converter, a measurement CT, a network interface, a first USB interface, a second USB interface and a data line, wherein an assembling post is fixedly installed at the rear part of the front panel, the display screen and the operation key are both fixedly installed at the front part of the front panel, an assembling lug is fixedly installed on the outer peripheral surface of the box body, the box body is fixedly installed at the rear part of the front panel in a matching way through the assembling lug and the assembling post, the assembling lug is fixedly connected with the assembling post through a screw, the two rubber bases are both fixedly installed inside the box body and are symmetrically arranged, and an oval through hole is formed in the middle part of each rubber base, and arc-shaped notches are arranged at both ends of each rubber base, the main control board is fixedly arranged on the two rubber bases through bolts, the main control board is positioned in the box body, the high-performance processor, the A/D converter, the measurement CT, the network interface and the first USB interface are all integrally installed on the main control board, the A/D converter, the network interface, the first USB interface and the special photovoltaic grid-connected switch are all electrically connected with the high-performance processor, the measurement CT is electrically connected with the A/D converter, the second USB interface is fixedly arranged at the rear part of the front panel, the data line is connected between the second USB interface and the first USB interface, and the display screen and the operation keys are electrically connected with the high-performance processor through the data line.
Optionally, the anti-islanding protection device further comprises a first positioning module, a first communication module and a storage module, wherein the first positioning module, the first communication module and the storage module are integrally installed on the main control board, and the first positioning module, the first communication module and the storage module are electrically connected with the high-performance processor.
Optionally, prevent island protection device still includes two terminals, small current sensor, thunderbolt current sensor and earth connection, two the terminal the small current sensor and the equal fixed mounting of thunderbolt current sensor is in on the main control board, small current sensor and the thunderbolt current sensor all is located two between the terminal, small current sensor and the thunderbolt current sensor all with high performance treater electric connection, earth connection electric connection is two between the terminal, just the earth connection runs through respectively small current sensor's inspection hole and the inspection hole setting of thunderbolt current sensor.
Optionally, a threading hole is further formed in the bottom wall of the box body, a threading pipe is fixedly mounted on the outer side face of the bottom wall of the box body, and the threading pipe and the threading hole are coaxially arranged.
Optionally, a retaining ring is further fixedly mounted at the rear portion of the front panel, and the outer peripheral surface of the retaining ring and the inner side surface of the box body are attached to each other.
Optionally, the live warning device comprises a housing, a solar panel, a cylindrical transparent shell, a current transformer, an assembly plate, an MCU microprocessor, a lithium ion battery, a buzzer and an LED alarm lamp, wherein a fixed seat is arranged at the top of the housing, the solar panel is fixedly arranged on the outer side surface of the housing, the cylindrical transparent shell is fixedly arranged at the bottom of the housing, the current transformer is fixedly arranged at the top of the housing, the current transformer is positioned at the inner side of the fixed seat, the assembly plate is fixedly arranged in the cylindrical transparent shell, the MCU microprocessor, the lithium ion battery and the buzzer are all fixedly arranged at the bottom of the assembly plate, the LED alarm lamp is fixedly arranged at the upper part of the inner bottom wall of the cylindrical transparent shell, and the LED alarm lamp, the buzzer and the current transformer are all electrically connected with the MCU microprocessor, the solar cell panel is electrically connected with the lithium ion storage battery, and the lithium ion storage battery is electrically connected with the MCU microprocessor, the buzzer and the LED alarm lamp respectively.
Optionally, the electrified warning device further comprises a second positioning module and a second communication module, the second positioning module and the second communication module are fixedly mounted at the bottom of the assembling plate, and the second positioning module and the second communication module are electrically connected with the MCU microprocessor.
Optionally, the storage module is a storage hard disk, the first positioning module and the second positioning module are both GPS positioning modules, and the first communication module and the second communication module each include at least one of a wireless network card, a Lora communication module, an NB-iot communication module, a 4G communication module, and a 5G communication module.
The invention provides a photovoltaic grid-connected anti-reverse power supply protection system, which consists of a cut-off device, an anti-islanding protection device and a live warning device, and has the main tasks of monitoring the low-voltage side of a distribution transformer of a photovoltaic grid-connected point in real time, carrying out necessary control on the photovoltaic grid-connected point, ensuring the rapidity of protection action and the accuracy of control when the islanding phenomenon occurs by adopting the match of the cut-off device and the anti-islanding protection device, taking the cut-off device and the anti-islanding protection device as backup protection when the islanding phenomenon occurs, rapidly cutting off the distributed islanding photovoltaic grid-connected point, integrating the functions of switch equipment, protection, measurement and control, communication and the like required by the grid-connected of the distributed photovoltaic grid-connected point, meeting the requirements of islanding detection, automatic safe grid-connected, protection, safe isolation and the like of the distributed photovoltaic grid-connected point, and simultaneously rapidly cutting off the failed grid-connected point in a very short time by the installed special photovoltaic grid-connected point, the safety of the person and the consumer is protected, the electrified warning device of synchronous installation can pass through by automated inspection distribution lines have more than 1A's residual current to report to the police through bee calling organ and LED alarm lamp in real time, carry out all-round cloth accuse to each node in the system of being incorporated into the power networks, formed the safety and technical support measure of integration, really realize the personal safety guarantee to the distribution lines maintainer, improve the safe and stable operation of system of being incorporated into the power networks.
In order that the foregoing and other objects, features, and advantages of the invention will be readily understood, a preferred embodiment of the invention will be hereinafter described in detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 schematically shows an architecture diagram of a photovoltaic grid-connected anti-reverse power supply protection system according to the present invention;
fig. 2 schematically shows a structural schematic diagram of a cut-off device of a photovoltaic grid-connected anti-reverse power supply protection system of the invention;
fig. 3 schematically shows a first structural diagram of an anti-islanding protection device of a photovoltaic grid-connected anti-reverse power supply protection system according to the present invention;
fig. 4 schematically shows a structural schematic diagram ii of an anti-islanding protection device of a photovoltaic grid-connected anti-reverse power supply protection system according to the present invention;
fig. 5 schematically shows a third structural schematic diagram of an anti-islanding protection device of the photovoltaic grid-connected anti-reverse power supply protection system;
FIG. 6 schematically shows an enlarged structural schematic of the partial view A of FIG. 5;
fig. 7 schematically shows an explosion structure diagram of an anti-islanding protection device of a photovoltaic grid-connected anti-reverse power supply protection system according to the invention;
fig. 8 schematically shows a first partial structural diagram of an anti-islanding protection device of a photovoltaic grid-connected anti-reverse power supply protection system according to the present invention;
fig. 9 schematically shows a second partial structure diagram of an anti-islanding protection device of the photovoltaic grid-connected anti-reverse power supply protection system according to the present invention;
fig. 10 schematically shows a first structural schematic diagram of a live warning device of the photovoltaic grid-connected anti-reverse power supply protection system of the invention;
fig. 11 schematically shows a structural schematic diagram ii of a live warning device of the photovoltaic grid-connected anti-reverse power supply protection system of the invention;
fig. 12 schematically shows a schematic partial cross-sectional structural view of a live warning device of the photovoltaic grid-connected anti-reverse power supply protection system of the invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 12, an embodiment of the present invention provides a photovoltaic grid-connected anti-reverse power supply protection system, including: the device comprises a disconnecting device 1, an anti-islanding protection device 2 and a live warning device 3.
The cutting device 1 is used for rapidly cutting off a fault photovoltaic grid connection point in a very short time so as to protect the safety of personnel and electric equipment;
the anti-islanding protection device 2 is used for controlling the cut-off device 1 to cut off a faulty photovoltaic grid-connected point or to access a photovoltaic grid-connected point with a fault eliminated again;
wherein, electrified warning device 3 is used for detecting that the photovoltaic grid-connected point that cuts off has residual current more than 1A to send alarm signal and warn the maintainer to notice residual current when detecting that the photovoltaic grid-connected point that cuts off has residual current more than 1A, in order to ensure maintainer life safety.
That is to say, the photovoltaic grid-connected anti-reverse power supply protection system provided by this embodiment is composed of a cut-off device 1, an anti-islanding protection device 2 and a live warning device 3, wherein the cut-off device 1 is used in cooperation with the anti-islanding protection device 2, the anti-islanding protection device 2 is used for controlling the cut-off device 1 to cut off a faulty photovoltaic grid-connected point or to access a photovoltaic grid-connected point with a fault eliminated again, so as to effectively protect the safety of a human body and electric equipment, in addition, the live warning device 3 is used for detecting whether the cut-off photovoltaic grid-connected point has residual current of more than 1A, and sending an alarm signal to warn a maintenance worker to pay attention to the residual current when detecting that the cut-off photovoltaic grid-connected point has residual current of more than 1A, so as to ensure the life safety of the maintenance worker, therefore, the photovoltaic grid-connected anti-reverse power supply protection system is enabled under the mutual cooperation of the cut-off device 1, the anti-islanding protection device 2 and the live warning device 3, the safety of the personnel and the electric equipment of the maintainers and the users can be effectively guaranteed.
Specifically, the cut-off device 1 comprises a special photovoltaic grid-connected switch 101, the special photovoltaic grid-connected switch 101 is suitable for a line with an alternating current of 50Hz, a rated voltage of four levels of 400V and a rated current of 63-800A, and when a human body gets an electric shock or the leakage current of a photovoltaic grid-connected point exceeds a specified value, the special photovoltaic grid-connected switch 101 quickly cuts off a fault power supply in a very short time so as to protect the safety of the human body and electric equipment.
That is to say, the disconnecting device 1 provided in this embodiment is mainly composed of the special photovoltaic grid-connected switch 101, wherein the special photovoltaic grid-connected switch 101 is suitable for a line with an ac voltage of 50Hz, a rated voltage of four levels of 400V, and a rated current of 63-800A, when a human body gets an electric shock or a leakage current of a photovoltaic grid-connected point exceeds a specified value, the special photovoltaic grid-connected switch 101 quickly disconnects a fault power supply within a very short time, so as to protect the safety of the human body and electric equipment, and the special photovoltaic grid-connected switch 101 can select an electromagnetic contactor.
Specifically, the anti-islanding protection device 2 includes a front panel 201, a display screen 203, an operation key 204, a box 202, two rubber bases 213, a main control board 212, a high-performance processor 216, an a/D converter 217, a measurement CT 218, a network interface 221, a first USB interface 214, a second USB interface 211 and a data line 215, wherein an assembly column 207 is fixedly installed at the rear of the front panel 201, the display screen 203 and the operation key 204 are fixedly installed at the front of the front panel 201, an assembly ear 208 is fixedly installed on the outer peripheral surface of the box 202, the box 202 is fixedly installed at the rear of the front panel 201 by matching the assembly ear 208 and the assembly column 207, the assembly ear 208 and the assembly column 207 are fixedly connected by a screw 209, the two rubber bases 213 are fixedly installed inside the box 202, the two rubber bases 213 are symmetrically arranged, an oval through hole 227 is formed in the middle of each rubber base 213, arc notches 226 are formed in two ends of each rubber base 213, the main control board 212 is fixedly installed on the two rubber bases 213 through bolts, the main control board 212 is located inside the box body 202, the high-performance processor 216, the A/D converter 217, the measurement CT 218, the network interface 221 and the first USB interface 214 are integrally installed on the main control board 212, the A/D converter 217, the network interface 221, the first USB interface 214 and the special photovoltaic grid-connected switch 101 are electrically connected with the high-performance processor 216, the measurement CT 218 is electrically connected with the A/D converter 217, the second USB interface 211 is fixedly installed at the rear portion of the front panel 201, the data line 215 is connected between the second USB interface 211 and the first USB interface 214, and the display screen 203 and the operation keys 204 are electrically connected with the high-performance processor 216 through the data line 215.
That is, the anti-islanding protection device 2 provided by this embodiment mainly comprises a front panel 201, a display 203, an operation button 204, a box 202, two rubber bases 213, a main control board 212, a high performance processor 216, an a/D converter 217, a measurement CT 218, a network interface 221, a first USB interface 214, a second USB interface 211 and a data line 215, wherein a fitting post 207 is fixedly installed at the rear of the front panel 201, a fitting lug 208 is fixedly installed on the outer peripheral surface of the box 202, the box 202 is fixedly installed at the rear of the front panel 201 by fitting the fitting lug 208 and the fitting post 207, the fitting lug 208 and the fitting post 207 are fixedly connected by a screw 209, and the display 203 and the operation button 204 are electrically connected with the high performance processor 216 by using the data line 215 and the second USB interface 211 to cooperate with the first USB interface 214, so that the anti-islanding protection device 2 is assembled, is more convenient; in addition, the middle part of each rubber base 213 is provided with an oval through hole 227, the two ends of each rubber base 213 are provided with arc notches 226, the main control board 212 is fixedly installed on the two rubber bases 213 through bolts, the rubber bases 213 have better shock absorption and buffering performance under the mutual matching of the arc notches 226 and the oval through holes 227, the rubber bases 213 can elastically deform along the longitudinal direction and the transverse direction, so that the shock absorption and buffering performance of the rubber bases 213 is better than that of the existing shock absorption components, the main control board 212 has better protection effect, the service life of the anti-islanding protection device 2 can be effectively ensured, when in use, the live wire or the positive wire of the photovoltaic grid-connected point is introduced into the box body 202 and passes through the detection hole of the measurement CT 218, when the measurement CT 218 detects that the current in the live wire or the positive wire of the photovoltaic grid-connected point is abnormal, the CT 218 generates an electric signal and uploads the electric signal to the A/D converter 217, the A/D converter 217 converts the electric signal and uploads the electric signal to the high-performance processor 216, the high-performance processor 216 analyzes and processes received data and sends the processed data to the display screen 203 for display, then the data is accessed to the network through the network interface 221 for data transmission and can be uploaded to a management center, the purpose of remote monitoring is achieved, in addition, the A/D converter 217 samples at 32 points per week when working, and the data monitoring precision of the anti-islanding protection device 2 can be guaranteed; in addition, the display screen 203 can display the working data of the anti-islanding protection device 2, and the operating key 204 can be used to set the working parameters of the anti-islanding protection device 2.
The photovoltaic grid-connected anti-reverse power supply protection system is mainly suitable for a distributed photovoltaic power generation grid-connected point with a voltage level of 10KV or 380V, the function setting is according to related standards of distributed power supply grid-connected published by the state, functions of switching equipment, protection, measurement and control, communication and the like required by the distributed power supply grid-connected are integrated, requirements of island detection, automatic safety grid-connected, protection, safety isolation and the like of the distributed power supply grid-connected are met, integration and simplification of equipment required by the distributed power supply grid-connected point are achieved, and plug and play of the distributed power supply grid-connected to a power distribution network are achieved.
Specifically, the anti-islanding protection device 2 further includes a first positioning module 225, a first communication module 224 and a storage module 223, the first positioning module 225, the first communication module 224 and the storage module 223 are all integrally installed on the main control board 212, and the first positioning module 225, the first communication module 224 and the storage module 223 are all electrically connected to the high-performance processor 216.
That is to say, the anti-islanding protection device 2 provided in this embodiment further includes a first positioning module 225, a first communication module 224, and a storage module 223, where the first positioning module 225 is configured to obtain geographic location information of the anti-islanding protection device 2, the first communication module 224 is configured to enable emergency communication when the network interface 221 fails, so as to ensure that the anti-islanding protection device 2 is online in real time, and the storage module 223 is configured to store data monitored during operation of the anti-islanding protection device 2.
Specifically, the anti-islanding protection device 2 further includes two terminals 219, a small current sensor 220, a lightning strike current sensor 222 and a grounding wire 227, the two terminals 219, the small current sensor 220 and the lightning strike current sensor 222 are both fixedly mounted on the main control board 212, the small current sensor 220 and the lightning strike current sensor 222 are both located between the two terminals 219, the small current sensor 220 and the lightning strike current sensor 222 are both electrically connected with the high-performance processor 216, the grounding wire 227 is electrically connected between the two terminals 219, and the grounding wire 227 respectively penetrates through a detection hole of the small current sensor 220 and a detection hole of the lightning strike current sensor 222.
That is to say, the anti-islanding protection device 2 provided by this embodiment further has two terminals 219, a small current sensor 220, a lightning current sensor 222 and a ground wire 227, the two terminals 219, the small current sensor 220, the lightning current sensor 222 and the ground wire 227 cooperate with the high-performance processor 216 to form a simple real-time on-line monitoring device for lightning strike conditions of the line, so that the real-time on-line monitoring device for lightning strike conditions of the line can be used for real-time on-line monitoring whether the line of the photovoltaic grid-connected point is struck by lightning or not, and the real-time on-line monitoring device for lightning strike conditions of the line can be conveniently found in time after the anti-islanding protection device 2 is struck by lightning, so that the workload of manual line patrol can be effectively reduced, the time for fault repair can be shortened, the power failure loss of the photovoltaic grid-connected system can be reduced, and the stable operation of the photovoltaic grid-connected system can be effectively ensured.
It should be further noted that the small current sensor 220 may be a precision small current transformer module of type TQHG-MT88, the lightning strike current sensor 222 may be a rogowski transformer + integrator of type MFT-S9.6, and the high performance processor 216 may be a single chip microcomputer of type STC89C 51.
Specifically, a threading hole 205 is further formed in the bottom wall of the box body 202, a threading pipe 206 is fixedly mounted on the outer side face of the bottom wall of the box body 202, and the threading pipe 206 and the threading hole 205 are coaxially arranged.
That is to say, the through wires hole 205 and the threading pipe 206 have on the diapire of the box body 202 that this embodiment provided, when this prevent island protection device 2 wiring, can pass through the inside that the threading hole 205 introduced box body 202 with the cable, after the wiring finishes, pour into epoxy in the threading pipe 206 and encapsulate to guarantee the leakproofness of box body 202, reach dustproof and waterproof's purpose, can guarantee this prevent island protection device 2's life.
Specifically, a retainer ring 210 is further fixedly mounted at the rear portion of the front panel 201, and the outer peripheral surface of the retainer ring 210 and the inner side surface of the box body 202 are attached to each other.
That is, the front panel 201 of the present embodiment further has a retainer ring 210 at the rear, the retainer ring 210 has a sealing function on the inner side of the box 202, and also has a positioning function on the box 202, so that the assembling ears 208 are aligned with the assembling posts 207 when the box 202 is assembled, and the assembly is facilitated.
Specifically, the electrified warning device 3 comprises a housing 301, a solar panel 302, a cylindrical transparent shell 305, a current transformer 303, a mounting plate 306, an MCU microprocessor 310, a lithium ion battery 309, a buzzer 311 and an LED alarm lamp 312, wherein a fixing base 304 is arranged on the top of the housing 301, the solar panel 302 is fixedly mounted on the outer side surface of the housing 301, the cylindrical transparent shell 305 is fixedly mounted on the bottom of the housing 301, the current transformer 303 is fixedly mounted on the top of the housing 301, the current transformer 303 is positioned inside the fixing base 304, the mounting plate 306 is fixedly mounted inside the cylindrical transparent shell 305, the MCU microprocessor 310, the lithium ion battery 309 and the buzzer 311 are all fixedly mounted on the bottom of the mounting plate 306, the LED alarm lamp 312 is fixedly mounted on the upper portion of the inner bottom wall of the cylindrical transparent shell 305, the LED alarm lamp 312, the buzzer 311 and the current transformer 303 are all electrically connected with the MCU microprocessor 310, the solar cell panel 302 is electrically connected with the lithium ion battery 309, and the lithium ion battery 309 is electrically connected with the MCU microprocessor 310, the buzzer 311, and the LED alarm lamp 312.
That is to say, the live warning device 3 provided by this embodiment mainly comprises a housing 301, a solar panel 302, a cylindrical transparent casing 305, a current transformer 303, a mounting board 306, an MCU microprocessor 310, a lithium ion battery 309, a buzzer 311 and an LED alarm lamp 312, wherein the solar panel 302 is used for converting solar energy into electric energy to charge the lithium ion battery 309, the lithium ion battery 309 is used for supplying power to the current transformer 303, the MCU microprocessor 310, the buzzer 311 and the LED alarm lamp 312, the current transformer 303 is used for detecting whether the cut photovoltaic grid-connected point has a residual current of 1A or more and generating an electric signal and uploading the electric signal to the MCU microprocessor 310 when detecting that the cut photovoltaic grid-connected point has a residual current of 1A or more, the MCU microprocessor 310 controls the buzzer 311 to emit an alarm sound and controls the LED alarm lamp 312 to emit an alarm light to warn a maintenance person to notice the residual current, so as to guarantee the life safety of the maintainers.
Specifically, the electrified warning device 3 further includes a second positioning module 308 and a second communication module 307, wherein the second positioning module 308 and the second communication module 307 are both fixedly mounted at the bottom of the mounting plate 306, and the second positioning module 308 and the second communication module 307 are both electrically connected to the MCU microprocessor 310.
That is to say, the electrified warning device 3 provided in this embodiment further has a second positioning module 308 and a second communication module 307, the second positioning module 308 is configured to obtain the geographic location information of the electrified warning device 3, so as to quickly find the location of the electrified warning device 3, and the second communication module 307 is configured to implement the purpose of remote communication for the electrified warning device 3.
Specifically, the storage module 223 is a storage hard disk, the first positioning module 225 and the second positioning module 308 are both GPS positioning modules, and the first communication module 224 and the second communication module 307 both include at least one of a wireless network card, a Lora communication module, an NB-iot communication module, a 4G communication module, and a 5G communication module.
That is to say, the storage module 223 provided in this embodiment may be a storage hard disk, the first positioning module 225 and the second positioning module 308 may be GPS positioning modules, and the first communication module 224 and the second communication module 307 may be at least one of a wireless network card, a Lora communication module, an NB-iot communication module, a 4G communication module, and a 5G communication module.
As described above, the invention is applied to the technical scheme of the invention, and the photovoltaic grid-connected anti-reverse power supply protection system provided by the invention is composed of a cut-off device 1, an anti-island protection device 2 and a live warning device 3, wherein the cut-off device 1 is used in cooperation with the anti-island protection device 2, the anti-island protection device 2 is used for controlling the cut-off device 1 to cut off a faulty photovoltaic grid-connected point or to access a photovoltaic grid-connected point with a fault eliminated again, so that the safety of human bodies and electric equipment can be effectively protected, in addition, the live warning device 3 is used for detecting whether the cut-off photovoltaic grid-connected point has residual current of more than 1A, and sending out a warning signal to warn maintenance personnel to pay attention to the residual current when detecting that the cut-off photovoltaic grid-connected point has residual current of more than 1A, so as to ensure the life safety of the maintenance personnel, therefore, the photovoltaic grid-connected anti-reverse power supply protection system is enabled under the mutual cooperation of the cut-off device 1, the anti-island protection device 2 and the live warning device 3, the safety of the personnel and the electric equipment of the maintainers and the users can be effectively guaranteed.
The photovoltaic grid-connected anti-reverse power supply protection system has the main tasks of monitoring the low-voltage side of a distribution transformer of a photovoltaic grid-connected point in real time, carrying out necessary control on the photovoltaic grid-connected point, and ensuring the rapidity of protection action and the accuracy of control when an isolated island phenomenon occurs by matching the cut-off device 1 with the anti-isolated island protection device 2.
In conclusion, when an islanding phenomenon occurs, the cutting device 1 and the anti-islanding protection device 2 are used as backup protection, distributed islanding photovoltaic grid-connected points can be cut off rapidly, functions of switch equipment, protection, measurement and control, communication and the like required by the distributed photovoltaic grid-connected points are integrated, requirements of islanding detection, automatic safety grid-connected, protection, safety isolation and the like of the distributed photovoltaic grid-connected points are met, meanwhile, the special photovoltaic grid-connected switch 101 installed can cut off a fault photovoltaic grid-connected point rapidly within a very short time, safety of people and electric equipment is protected, the synchronously installed live warning device 3 can automatically detect whether residual current of more than 1A passes through a distribution line or not, and alarms are carried out through the buzzer 311 and the LED alarm lamp 312 in real time, all-directional distribution and control are carried out on each node in a grid-connected system, and an integrated safety technical guarantee measure is formed, the personal safety of distribution line maintainers is really guaranteed, and the safe and stable operation of a grid-connected system is improved.
In summary, the above-mentioned embodiments are provided only for illustrating the principles and effects of the present invention, and not for limiting the present invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a photovoltaic is incorporated into power networks and is prevented reverse power supply protection system which characterized in that includes:
the cutting device is used for rapidly cutting off a fault photovoltaic grid connection point in a very short time so as to protect the safety of human bodies and electric equipment;
the anti-islanding protection device is used for controlling the cut-off device to cut off the failed photovoltaic grid-connected point or to access the photovoltaic grid-connected point again for failure elimination;
electrified warning device for the photovoltaic grid connection point that detects the disconnection has residual current more than 1A, and send alarm signal warning maintainer to notice residual current when detecting the photovoltaic grid connection point that cuts off has residual current more than 1A, in order to guarantee maintainer life safety.
2. The system for preventing reverse power supply of the photovoltaic grid-connected inverter as claimed in claim 1, wherein the cut-off device comprises a photovoltaic special grid-connected switch, the photovoltaic special grid-connected switch is suitable for a line with 50Hz of alternating current, four 400V of rated voltage and rated current of 63-800A, and when a human body gets an electric shock or the leakage current of a photovoltaic grid-connected point exceeds a specified value, the photovoltaic special grid-connected switch cuts off the fault power supply rapidly in an extremely short time so as to protect the safety of the human body and electric equipment.
3. The photovoltaic grid-connected anti-reverse-power-supply protection system according to claim 2, wherein the anti-islanding protection device comprises a front panel, a display screen, an operation button, a box body, two rubber bases, a main control board, a high-performance processor, an A/D converter, a measurement CT, a network interface, a first USB interface, a second USB interface and a data line, wherein an assembly column is fixedly installed at the rear part of the front panel, the display screen and the operation button are both fixedly installed at the front part of the front panel, an assembly lug is fixedly installed on the outer peripheral surface of the box body, the box body is fixedly installed at the rear part of the front panel by matching the assembly lug and the assembly column through screws, the two rubber bases are both fixedly installed inside the box body and are symmetrically arranged, the middle part of each rubber base is provided with an oval through hole, the two ends of each rubber base are provided with arc notches, the main control board is fixedly arranged on the two rubber bases through bolts, the main control board is positioned in the box body, the high-performance processor, the A/D converter, the measurement CT, the network interface and the first USB interface are integrally arranged on the main control board, the A/D converter, the network interface, the first USB interface and the special photovoltaic grid-connected switch are electrically connected with the high-performance processor, the measurement CT is electrically connected with the A/D converter, the second USB interface is fixedly arranged at the rear part of the front panel, and the data line is connected between the second USB interface and the first USB interface, the display screen and the operation keys are electrically connected with the high-performance processor through the data lines.
4. The photovoltaic grid-connected anti-reverse-power-supply protection system according to claim 3, wherein the anti-islanding protection device further comprises a first positioning module, a first communication module and a storage module, the first positioning module, the first communication module and the storage module are integrally installed on the main control board, and the first positioning module, the first communication module and the storage module are electrically connected with the high-performance processor.
5. The photovoltaic grid-connected anti-reverse-power-supply protection system according to claim 4, wherein the anti-islanding protection device further comprises two terminals, a small current sensor, a lightning strike current sensor and a ground wire, the two terminals, the small current sensor and the lightning strike current sensor are all fixedly mounted on the main control board, the small current sensor and the lightning strike current sensor are all located between the two terminals, the small current sensor and the lightning strike current sensor are all electrically connected with the high-performance processor, the ground wire is electrically connected between the two terminals, and the ground wire penetrates through a detection hole of the small current sensor and a detection hole of the lightning strike current sensor respectively.
6. The photovoltaic grid-connected anti-reverse-power-supply protection system as claimed in claim 5, wherein a threading hole is further formed in the bottom wall of the box body, a threading pipe is fixedly mounted on the outer side face of the bottom wall of the box body, and the threading pipe and the threading hole are coaxially arranged.
7. The photovoltaic grid-connected anti-reverse-power-supply protection system as claimed in claim 6, wherein a retaining ring is further fixedly mounted at the rear portion of the front panel, and the outer peripheral surface of the retaining ring and the inner side surface of the box body are mutually attached.
8. The photovoltaic grid-connected anti-reverse power supply protection system according to claim 7, wherein the live warning device comprises a housing, a solar cell panel, a cylindrical transparent shell, a current transformer, an assembly plate, an MCU microprocessor, a lithium ion battery, a buzzer and an LED alarm lamp, the top of the housing is provided with a fixed seat, the solar cell panel is fixedly installed on the outer side surface of the housing, the cylindrical transparent shell is fixedly installed at the bottom of the housing, the current transformer is fixedly installed at the top of the housing and is positioned at the inner side of the fixed seat, the assembly plate is fixedly installed inside the cylindrical transparent shell, the MCU microprocessor, the lithium ion battery and the buzzer are all fixedly installed at the bottom of the assembly plate, the LED alarm lamp is fixedly installed at the upper part of the inner bottom wall of the cylindrical transparent shell, the LED alarm lamp, the buzzer and the current transformer are electrically connected with the MCU microprocessor, the solar cell panel is electrically connected with the lithium ion storage battery, and the lithium ion storage battery is respectively electrically connected with the MCU microprocessor, the buzzer and the LED alarm lamp.
9. The photovoltaic grid-connected anti-reverse-power-supply protection system according to claim 8, wherein the live warning device further comprises a second positioning module and a second communication module, the second positioning module and the second communication module are both fixedly mounted at the bottom of the assembly plate, and the second positioning module and the second communication module are both electrically connected with the MCU microprocessor.
10. The photovoltaic grid-connected anti-reverse-power-supply protection system according to claim 9, wherein the storage module is a storage hard disk, the first positioning module and the second positioning module are both GPS positioning modules, and the first communication module and the second communication module each include at least one of a wireless network card, a Lora communication module, an NB-iot communication module, a 4G communication module, and a 5G communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111022418.9A CN113644692A (en) | 2021-09-01 | 2021-09-01 | Photovoltaic grid-connected anti-reverse power supply protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111022418.9A CN113644692A (en) | 2021-09-01 | 2021-09-01 | Photovoltaic grid-connected anti-reverse power supply protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113644692A true CN113644692A (en) | 2021-11-12 |
Family
ID=78424838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111022418.9A Pending CN113644692A (en) | 2021-09-01 | 2021-09-01 | Photovoltaic grid-connected anti-reverse power supply protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113644692A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110309684A1 (en) * | 2010-06-22 | 2011-12-22 | Sungkyunkwan University Foundation For Corporate Collaboration | Apparatus and method for the anti-islanding of power conditioning system |
| CN103199559A (en) * | 2013-02-25 | 2013-07-10 | 孟绍良 | Intelligent center control type solar energy family roof grid-connected power generation system and operating method thereof |
| CN105391178A (en) * | 2015-12-24 | 2016-03-09 | 无锡信大气象传感网科技有限公司 | Substation anti-islanding operation monitoring system |
| CN206211937U (en) * | 2016-11-17 | 2017-05-31 | 湖南科比特新能源科技股份有限公司 | A kind of DC distribution cabinet intelligent controller for photovoltaic generating system |
| CN110165786A (en) * | 2019-06-12 | 2019-08-23 | 国网安徽省电力有限公司合肥供电公司 | A kind of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system |
-
2021
- 2021-09-01 CN CN202111022418.9A patent/CN113644692A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110309684A1 (en) * | 2010-06-22 | 2011-12-22 | Sungkyunkwan University Foundation For Corporate Collaboration | Apparatus and method for the anti-islanding of power conditioning system |
| CN103199559A (en) * | 2013-02-25 | 2013-07-10 | 孟绍良 | Intelligent center control type solar energy family roof grid-connected power generation system and operating method thereof |
| CN105391178A (en) * | 2015-12-24 | 2016-03-09 | 无锡信大气象传感网科技有限公司 | Substation anti-islanding operation monitoring system |
| CN206211937U (en) * | 2016-11-17 | 2017-05-31 | 湖南科比特新能源科技股份有限公司 | A kind of DC distribution cabinet intelligent controller for photovoltaic generating system |
| CN110165786A (en) * | 2019-06-12 | 2019-08-23 | 国网安徽省电力有限公司合肥供电公司 | A kind of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106841934A (en) | Intelligent trouble indicator and instruction system | |
| CN206657077U (en) | Intelligent trouble indicator and instruction system | |
| CN203553628U (en) | Intelligent power box for base station | |
| CN110571932A (en) | Big data-based substation equipment running state early warning device | |
| CN115277703B (en) | Cable line state real-time monitoring system and method based on intelligent big data analysis | |
| CN200941545Y (en) | Fire-proof electricity leakage protector | |
| CN205829307U (en) | A kind of intelligent and safe distributing monitoring system | |
| CN113644692A (en) | Photovoltaic grid-connected anti-reverse power supply protection system | |
| CN206505513U (en) | A kind of electric fire disaster warning monitoring device | |
| CN213780701U (en) | Internal environment management and control system of distribution box | |
| CN208506927U (en) | A kind of cigarette sense monitoring wireless terminal | |
| CN205123368U (en) | Portable emergent direct current charging device | |
| CN210074873U (en) | Portable direct-current power supply system with insulation monitoring function | |
| CN210074881U (en) | Power utilization potential safety hazard supervision system based on safety cloud platform | |
| CN204669079U (en) | A kind of safety control for resident's distribution | |
| CN210294375U (en) | Lightning arrester leakage current on-line monitoring current transformer and on-line monitoring system | |
| CN111307219A (en) | Grounding circulation on-line monitoring system with active anti-theft and high-speed wireless transmission | |
| CN219456325U (en) | Voltage fluctuation alarm equipment | |
| CN214064398U (en) | High-stability wireless data transmission equipment | |
| CN205911829U (en) | Miniature circuit breaker who possesses temperature measurement function | |
| CN215932767U (en) | Electrified warning device of photovoltaic grid-connected anti-reverse power supply protection system | |
| CN217240298U (en) | Electric intelligent electric leakage protection equipment for building | |
| CN219727893U (en) | Charging system based on fault judgment | |
| CN217676209U (en) | Elevator short-circuit wire warning device | |
| CN217133207U (en) | Novel intelligent lightning protection online monitoring terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |