CN111162561A - Intelligent anti-islanding system with automatic temperature measurement function - Google Patents
Intelligent anti-islanding system with automatic temperature measurement function Download PDFInfo
- Publication number
- CN111162561A CN111162561A CN202010067004.7A CN202010067004A CN111162561A CN 111162561 A CN111162561 A CN 111162561A CN 202010067004 A CN202010067004 A CN 202010067004A CN 111162561 A CN111162561 A CN 111162561A
- Authority
- CN
- China
- Prior art keywords
- islanding
- grid
- fiber
- temperature measuring
- disturbance
- 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
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 93
- 238000010248 power generation Methods 0.000 claims abstract description 25
- 239000013307 optical fiber Substances 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 17
- 239000010949 copper Substances 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 230000005672 electromagnetic field Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
- H02H1/0069—Details of emergency protective circuit arrangements concerning transmission of signals by means of light or heat rays
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
-
- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values
-
- 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
-
- 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
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to an intelligent anti-islanding system with an automatic temperature measurement function, which comprises an anti-islanding device and a fiber grating temperature measurement device. The anti-islanding device comprises a disturbance resistor and an operation switch; the anti-islanding controller is electrically connected with the sensing temperature measuring device and the operating switch respectively. When the islanding phenomenon is generated and the grid-connected inverter still works, the anti-islanding device pulls open a grid-connected switch, the connection between a power grid and a photovoltaic grid-connected power generation system is cut off, meanwhile, the anti-islanding controller controls an operation switch to be switched on, disturbance resistance is switched on, and parameters of operation in the photovoltaic grid-connected power generation system are changed, so that the grid-connected inverter stops operating, a bus is not electrified, and the safety of maintainers and equipment is protected. And the temperature rises after the disturbance resistor is put into operation, the sensing temperature measuring device is used for detecting the temperature and feeding back a signal to the anti-islanding controller, when the temperature rises to a limit value and the operation switch is not disconnected, the operation switch is immediately disconnected, the disturbance resistor is protected from being burnt, and meanwhile, the anti-islanding device is also protected.
Description
Technical Field
The invention relates to the technical field of anti-islanding devices, in particular to an intelligent anti-islanding system with an automatic temperature measurement function.
Background
The photovoltaic 'island effect' refers to the phenomenon that when partial lines of a power grid have power failure due to faults or maintenance, a power-off line is continuously supplied by a connected grid-connected power generation device and forms a self-supplied power island together with surrounding loads. When the power grid normally works, the system is clamped by the power grid, and the photovoltaic power generation system is consistent with the power grid. When the islanding phenomenon occurs, the system is not controlled by the power grid any more, and once the islanding phenomenon occurs, the photovoltaic power generation system in an out-of-control state brings much harm.
The grid-photovoltaic power generation system is connected with an inverter, the inverter has an anti-islanding protection function, and the inverter automatically trips and stops running when the grid is abnormal, but the inverter is normally debugged under the condition of no fault. The national grid has clear regulations on anti-islanding and anti-islanding devices in distributed photovoltaic power generation: for a power supply (a grid-connected point and a bus on the high-voltage side of the transformer directly connected with the public power grid) accessed to the public power grid through the transformer or an output summary point of the power supply not accessed to the public power grid through the transformer, in order to avoid an island effect, measures such as changing voltage or injecting a frequency disturbance signal through an anti-island device are needed, island operation of the distributed power supply is damaged, and safety protection measures are realized.
In the prior art, a chinese patent document with an authorization publication number of CN207835079U discloses an automatic photovoltaic anti-islanding device, which includes a grid-connected special switch arranged on a circuit between a power grid and a photovoltaic power generation system. Two sides of the grid-connected special switch are respectively communicated with a power inlet end and a power outlet end of the anti-islanding controller through lines; and a voltage signal sensor is arranged on one side of the power inlet end of the grid-connected special switch and is communicated with the anti-islanding controller through a circuit. The grid-connected special switch is communicated with a circuit of the photovoltaic power generation system through a manual anti-islanding device, the manual anti-islanding device comprises an operation switch and a grounding disturbance resistor which are connected in series, and the output end of the anti-islanding controller is communicated with the manual anti-islanding device through the circuit. The automatic switching conversion of the anti-islanding device is realized by detecting the power grid information on the special grid-connected switch and judging whether the power grid side has power loss or not and the on-off condition of the special grid-connected switch.
The above prior art solutions have the following drawbacks: disturbance resistance in anti-island equipment is the part of establishing among them, and it is easy to generate heat and the temperature rise very fast when working, if disturbance resistance temperature rises to a take the altitude and does not cut off input power in time, can cause device and circuit in the anti-island device to damage, can seriously arouse the accident. Therefore, the temperature of the disturbance resistor is important to be detected, and the circuit can be safely disconnected when the disturbance resistor is overheated only by timely feeding back the temperature of the disturbance resistor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an intelligent anti-islanding system with an automatic temperature measurement function, which has the effect of detecting the temperature of a disturbance resistor.
The technical purpose of the invention is realized by the following technical scheme:
an intelligent anti-islanding system with an automatic temperature measurement function is applied to a photovoltaic grid-connected power generation system, a circuit between the photovoltaic grid-connected power generation system and a power grid is electrically connected with a grid-connected switch and a grid-connected inverter, and the grid-connected switch is electrically connected with an anti-islanding controller; the intelligent anti-islanding system comprises an anti-islanding device which is electrically connected to a circuit between the grid-connected switch and the photovoltaic grid-connected power generation system, and the anti-islanding device comprises a disturbance resistor and an operation switch; the intelligent anti-islanding system also comprises a sensing temperature measuring device for detecting the temperature of the disturbance resistor; and the anti-islanding controller is electrically connected with the sensing temperature measuring device and the operating switch respectively.
By adopting the technical scheme, when the isolated island phenomenon occurs and the grid-connected inverter does not trip by itself, the anti-isolated island controller controls the disturbance resistor to be put into a circuit, and the parameter operation balance in the grid-connected power generation system is changed, so that the grid-connected inverter stops operating, the grid-connected switch is disconnected, the connection between a power grid and the photovoltaic grid-connected power generation system is cut off, the bus is not electrified, and the safety of maintainers and equipment is protected. And the temperature of the disturbance resistor rises after the disturbance resistor is put into operation, the temperature of the disturbance resistor is detected by using the sensing temperature measuring device, a signal is fed back to the anti-islanding controller, and when the temperature rises to a limit value, the anti-islanding controller controls the operation switch to be switched off, so that the disturbance resistor is protected from being burnt.
The invention is further configured to: the sensing temperature measuring device is a fiber grating temperature measuring device; the fiber grating temperature measuring device comprises a fiber grating sensor, a transmission fiber and a fiber grating demodulation device.
By adopting the technical scheme, the anti-island device is usually arranged in a strong electromagnetic field, the common electric appliance sensor is easy to be interfered, and the fiber grating sensor and the transmission optical fiber have excellent anti-electromagnetic interference and safety performance, so that the anti-island device can be effectively used under the strong electromagnetic field environment condition.
The invention is further configured to: the fiber bragg grating sensor comprises a plurality of sensor tail fibers and copper bases, wherein the copper bases are connected to the end parts of the sensor tail fibers in a one-to-one correspondence manner; the copper base is fixedly connected to a temperature measuring point on the surface of the disturbance resistor.
By adopting the technical scheme, the copper base is used as a fixing piece at the temperature measuring point to be fixed and used as a medium for conducting heat.
The invention is further configured to: one end of the transmission optical fiber is connected to the fiber grating demodulation equipment, the other end of the transmission optical fiber is connected with an optical fiber branching unit, and all the sensor tail fibers are connected to the optical fiber branching unit.
By adopting the technical scheme, all the sensor tail fibers are connected to one transmission fiber by using the optical fiber branching unit.
The invention is further configured to: the upper end, the middle part and the lower end of the disturbance resistor are respectively provided with an upper temperature measuring point, a middle temperature measuring point and a lower temperature measuring point; the fiber bragg grating sensor comprises an upper end sensor, a middle sensor and a lower end sensor which are respectively arranged at an upper temperature measuring point, a middle temperature measuring point and a lower temperature measuring point.
By adopting the technical scheme, the temperature signals of the upper end, the lower end and the whole three positions of the middle part of the disturbance resistor are simultaneously acquired by the upper end sensor, the middle sensor and the lower end sensor, so that the temperature change of the whole disturbance resistor is comprehensively monitored, and the phenomenon of local overheating is prevented.
The invention is further configured to: the surface of the disturbance resistor is provided with flat mounting surfaces at an upper temperature measuring point, a middle temperature measuring point and a lower temperature measuring point; the copper base is attached and fixed to the installation surface.
Through adopting above-mentioned technical scheme, make installation face position level and smooth, clean through polishing, satisfy the installation requirement of sensor, and improve the heat conduction effect of copper base.
The invention is further configured to: the fiber grating demodulation equipment is a sensing analyzer based on a fiber MEMS tunable filter, and the temperature data acquisition is set to be 1Hz/25Hz/50 Hz.
By adopting the technical scheme, the sensing analyzer based on the technology of the fiber MEMS tunable filter is very suitable for long-term monitoring.
The invention is further configured to: the disturbance resistor is hollow and is provided with an insulating and heat-insulating structure; and the transmission optical fiber passes through the inside of the disturbance resistor and then is connected with the fiber grating demodulation equipment.
By adopting the technical scheme, as the optical fiber is made of quartz material and the coating is made of flame-retardant material with good insulating property, the optical fiber can ensure good insulating property and can effectively transmit optical signals detected by the disturbance resistor to the optical cable for long-distance transmission.
The invention is further configured to: two groups of operating switches are arranged in parallel; three groups of disturbance resistors are arranged in parallel; the fiber grating sensors are provided with three groups, and the three groups of fiber grating sensors are respectively arranged on the three groups of disturbance resistors.
By adopting the technical scheme, A, B, C three-phase power output by the inverter is respectively transmitted to the A-phase disturbance resistor, the B-phase disturbance resistor and the C-phase disturbance resistor through the two operation switches.
In conclusion, the beneficial effects of the invention are as follows:
1. when the islanding phenomenon occurs and the grid-connected inverter does not trip by itself, the anti-islanding controller controls the disturbance resistor to put into the circuit, and the parameter operation balance in the grid-connected power generation system is changed, so that the grid-connected inverter stops operating, the grid-connected switch is disconnected, the connection between a power grid and the photovoltaic grid-connected power generation system is cut off, the bus is not electrified, and the safety of maintenance personnel and equipment is protected. When the temperature rises to a limit value, the anti-islanding controller controls the operating switch to be switched off to protect the disturbance resistor from being burnt out;
2. because the anti-islanding device is usually arranged in a strong electromagnetic field, a general electric sensor is easy to be interfered, and the fiber grating sensor and the transmission fiber have excellent anti-electromagnetic interference and safety performance, and can be effectively used under the environment condition of the strong electromagnetic field.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the connection control of the anti-islanding device of the present invention;
FIG. 3 is a schematic diagram of the installation of the fiber grating temperature sensor of the present invention on a disturbance resistor;
FIG. 4 is a schematic diagram of the connection of the FBG temperature sensor of the present invention to a fiber optic splitter and a transmission cable;
FIG. 5 is a schematic diagram of the structure and spectral characteristics of a fiber grating of the present invention;
FIG. 6 is a schematic diagram of the fiber grating principle of the present invention;
FIG. 7 is a graph showing test data for a fiber grating temperature sensor of the present invention.
Reference numerals: 1. an anti-islanding device; 11. disturbing the resistance; 111. a mounting surface; 12. an operating switch; 13. an anti-islanding controller; 2. a fiber grating temperature measuring device; 21. a fiber grating sensor; 211. an upper end sensor; 212. a middle sensor; 213. a lower end sensor; 21a, a copper base; 21b, a sensor tail fiber; 22. an optical fiber splitter; 23. a transmission optical fiber; 24. fiber grating demodulation equipment; 3. a photovoltaic grid-connected power generation system; 4. a grid-connected switch; 5. a power grid; 6. a grid-connected inverter; 7. a transformer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment discloses an intelligent anti-islanding system with an automatic temperature measurement function, as shown in fig. 1, which is applied to a photovoltaic grid-connected power generation system 3, and a circuit between the photovoltaic grid-connected power generation system 3 and a power grid 5 is electrically connected with a grid-connected switch 4 and a grid-connected inverter 6.
As shown in fig. 1 and 2, the intelligent anti-islanding system includes an anti-islanding device 1 and a fiber grating temperature measuring device 2. The anti-island device 1 is electrically connected to a circuit between the grid-connected switch 4 and the photovoltaic grid-connected power generation system 3, and comprises three groups of grounded disturbance resistors 11, two groups of operation switches 12 connected in series between the disturbance resistors 11 and the circuit, and an anti-island controller 13 for controlling the disturbance resistors 11 to be switched into the circuit, wherein the operation switches 12 and the grid-connected switch are both electrically connected with the anti-island controller 13, and the on-off of the operation switches 12 and the grid-connected switch 4 can be controlled through the anti-island controller 13. Wherein, the anti-islanding controller 13 adopts a model LNCZQ-001 controller developed by Nanelectrics, Zhejiang province, Ltd; the disturbance resistor 11 is a model CMRB-1KW5.8RJ power resistor developed by Kyoto electric company, Shanghai.
A mutual inductor 7 is arranged on a circuit between the grid-connected switch 4 and the grid-connected inverter 6, the mutual inductor 7 is also electrically connected to the anti-islanding controller 13, the mutual inductor 7 is used for detecting the current and the voltage of the circuit, and signals are fed back to the anti-islanding controller 13; the fiber grating temperature measuring device 2 comprises three groups of fiber grating sensors 21, transmission fibers 23 and fiber grating demodulation equipment 24, and the disturbance resistor 11 is hollow and provided with an insulating and heat-insulating structure; the transmission fiber 23 passes through the disturbance resistor 11 and is connected to the fiber grating demodulation device 24. The three groups of fiber grating sensors 21 are respectively installed on the three groups of disturbance resistors 11, temperature detection is simultaneously performed on the three groups of disturbance resistors 11, temperature signals are transmitted to fiber grating demodulation equipment 24 in a control room through transmission optical fibers 23, so that the temperature signals are demodulated, real-time information of the field temperature is provided, and the fiber grating demodulation equipment 24 simultaneously transmits the signals to the anti-islanding controller 13.
As shown in fig. 2 and 3, an upper temperature measuring point, a middle temperature measuring point and a lower temperature measuring point are respectively arranged at the upper end, the middle part and the lower end of the disturbance resistor 11, and a flat mounting surface 111 is formed on the surface of the disturbance resistor 11 at the upper temperature measuring point, the middle temperature measuring point and the lower temperature measuring point by grinding; the copper bases 21a of the three groups of fiber grating sensors 21 are attached and fixed to the mounting surface 111. The mounting surface 111 is flat and clean, so that the mounting requirement of the sensor is met, and the heat conduction effect of the copper base 21a is improved.
As shown in fig. 3 and 4, the fiber grating sensor 21 is an all-fiber type detector, the fiber temperature is detected and the detection signal is directly transmitted, no power is supplied on site, the lightning stroke damage and the electromagnetic interference are avoided, the temperature measurement precision is ± 0.5 ℃, the temperature measurement fraction is distinguished as 0.1 ℃, the all-insulated fiber temperature sensor does not reduce the voltage safety level of the monitored equipment, the fiber temperature sensor is high-voltage resistant, creepage-proof, flame-retardant and explosion-proof, and the specific parameters are as follows:
the fiber bragg grating sensor 21 comprises a plurality of sensor tail fibers 21b and copper bases 21a, wherein the copper bases 21a are connected to the end parts of the sensor tail fibers 21b in a one-to-one correspondence manner; the copper base 21a is fixedly connected to a temperature measuring point on the surface of the disturbance resistor 11, and the copper base 21a is fixed as a fixing member at the temperature measuring point and serves as a medium for conducting heat. One end of the transmission fiber 23 is connected to the fiber grating demodulation device 24, the other end is connected to the fiber splitter 22, all the sensor pigtails 21b are connected to the fiber splitter 22, and all the sensor pigtails 21b are connected to one transmission fiber 23 by the fiber splitter 22.
As shown in fig. 5, a fiber grating for sensing includes a bragg reflector fabricated within a fiber core. The optical fiber uses the ultraviolet photosensitivity of the optical fiber material to form a space phase grating in the fiber core, so that after optical signals with certain spectral width pass through the optical fiber grating, light with specific wavelength is reflected back along the original path, and optical signals with other wavelengths are directly transmitted out. Temperature and stress are two physical quantities to which a fiber grating can be directly sensitive, and temperature causes the shift of the central wavelength of the grating mainly due to two aspects: the thermo-optic effect of the optical fiber material playing a major role and the thermal expansion effect playing a minor role can also cause the change of the effective refractive index of the optical fiber grating, so that the central wavelength drift of the grating reflects the change condition of the temperature field, thereby achieving the purpose of measurement. The change relation of the central wavelength of the fiber grating with temperature or strain is linear, so the fiber grating can be conveniently applied to the sensing field.
As shown in fig. 6, a Fiber Bragg Grating (FBG) is a reflective fiber filter device, and typically uses ultraviolet interference fringes to irradiate a 10 mm-long bare fiber to generate periodic refractive index modulation in the fiber core; at the bragg wavelength, a forward guided mode propagating in the optical waveguide couples to a backward reflected mode, forming a bragg reflection. For a particular spatial index modulation period (Λ) and core index (n), the bragg wavelength is:
λB＝2nΛ （1）
as can be seen from formula (1): both n and Λ changes cause a change in the wavelength of the reflected light. Therefore, through a certain packaging design, the FBG can achieve the purpose of being sensitive to the change of n and Λ caused by the change of the external temperature, the stress and the pressure.
As shown in FIG. 7, the FBG center wavelength is related to the temperature change
ΔλB＝λB（1＋ξ）ΔT （2）
In the formula (2), Δ λ B is the change of the central wavelength of the reflected light caused by the temperature change, Δ T is the change of the temperature, ξ is the thermo-optic coefficient of the optical fiber, and the sensitivity coefficients of the FBG to the temperature are respectively 10pm/oC in the 1550nm waveband.
The fiber grating demodulation device 24 is a sensing analyzer based on a fiber MEMS tunable filter, is specially used for monitoring the temperature in the power industry, is a sensing analyzer based on the technology of the fiber MEMS tunable filter, and is very suitable for long-term monitoring. The temperature data acquisition is set to be 1Hz/25Hz/50Hz, and 6 optical fiber temperature sensors are designed to be connected to each channel and maximally extend to 128 optical channels. The monitoring system adopts a 3-channel type, one sensing analyzer can be enough to monitor A, B, C three-phase three disturbance resistors, the monitored temperature point of each disturbance resistor can reach more than 3, and the three disturbance resistors can be supplemented by using one redundant channel. In addition, the redundant channel can also be used for monitoring the external environment temperature of the disturbance resistor and the temperature of the relevant power access point, so that the healthy operation of the disturbance resistor is more comprehensively ensured. The basic parameters are as follows:
the specific working principle of this embodiment is as follows:
when the isolated island phenomenon occurs and the grid-connected inverter 6 is not tripped by itself, the isolated island controller controls the disturbance resistor 11 to be put into a circuit, and the parameter operation balance in the grid-connected power generation system is changed, so that the grid-connected inverter 6 stops operating, the grid-connected switch 4 is disconnected, the connection between the power grid 5 and the photovoltaic grid-connected power generation system 3 is cut off, the bus is not electrified, and the safety of maintainers and equipment is protected.
In the process of putting the disturbance resistor 11 into the circuit, A, B, C three-phase power output by the inverter passes through the two operation switches 12 and respectively reaches the three disturbance resistors 11. The disturbance resistor 11 is provided with the fiber grating sensors 21, and each disturbance resistor 11 is provided with three fiber grating sensors 21 which are respectively arranged on the upper part, the middle part and the lower part of the disturbance resistor 11. The temperature measurement data of the fiber grating sensors 21 firstly enter a fiber grating data collector installed in the anti-islanding device 1, the temperature measurement data in the collector is divided into two parts, one part is transmitted to a computer of a dispatching control center, and meanwhile, the collector is communicated with the anti-islanding controller 13 to transmit the temperature measurement data to the anti-islanding controller 13. When the temperature data exceeds the specified data, the anti-islanding controller 13 may turn off the two operating switches 12, so as to protect the disturbance resistor 11 of the anti-islanding device 1. In the control center, the staff can also issue a command of turning off the operating switches 12 to the collector to reach the controller, turn off the two operating switches 12, protect the disturbance resistor 11 of the anti-islanding device 1, and send a signal to inform the staff.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. An intelligent anti-islanding system with an automatic temperature measurement function is applied to a photovoltaic grid-connected power generation system (3), a circuit between the photovoltaic grid-connected power generation system (3) and a power grid (5) is electrically connected with a grid-connected switch (4) and a grid-connected inverter (6), and the grid-connected switch (4) is electrically connected with an anti-islanding controller (13); the intelligent anti-islanding system comprises an anti-islanding device (1) which is electrically connected to a circuit between a grid-connected switch (4) and a photovoltaic grid-connected power generation system (3), wherein the anti-islanding device (1) comprises a disturbance resistor (11) and an operation switch (12); the method is characterized in that: the intelligent anti-islanding system also comprises a sensing temperature measuring device for detecting the temperature of the disturbance resistor (11); and the sensing temperature measuring device is respectively and electrically connected with the anti-islanding controller (13) and the operating switch (12).
2. The intelligent anti-islanding system with the automatic temperature measurement function according to claim 1, is characterized in that: the sensing temperature measuring device is a fiber grating temperature measuring device (2); the fiber grating temperature measuring device (2) comprises a fiber grating sensor (21), a transmission fiber (23) and a fiber grating demodulation device (24).
3. The intelligent anti-islanding system with the automatic temperature measurement function according to claim 2, wherein: the fiber bragg grating sensor (21) comprises a plurality of sensor tail fibers (21b) and copper bases (21a), wherein the copper bases (21a) are connected to the end parts of the sensor tail fibers (21b) in a one-to-one correspondence manner; the copper base (21a) is fixedly connected to a temperature measuring point on the surface of the disturbance resistor (11).
4. The intelligent anti-islanding system with the automatic temperature measurement function according to claim 2, wherein: one end of the transmission fiber (23) is connected to the fiber grating demodulation equipment (24), the other end of the transmission fiber is connected to the fiber branching unit (22), and all the sensor tail fibers (21b) are connected to the fiber branching unit (22).
5. The intelligent anti-islanding system with the automatic temperature measurement function according to claim 2, wherein: the upper end, the middle part and the lower end of the disturbance resistor (11) are respectively provided with an upper temperature measuring point, a middle temperature measuring point and a lower temperature measuring point; the fiber bragg grating sensor (21) comprises an upper end sensor (211), a middle sensor (212) and a lower end sensor (213) which are respectively arranged at an upper temperature measuring point, a middle temperature measuring point and a lower temperature measuring point.
6. The intelligent anti-islanding system with the automatic temperature measurement function according to claim 5, wherein: flat mounting surfaces (111) are arranged on the surface of the disturbance resistor (11) at the upper temperature measuring point, the middle temperature measuring point and the lower temperature measuring point; the copper base (21a) is attached and fixed to the mounting surface (111).
7. The intelligent anti-islanding system with the automatic temperature measurement function according to claim 2, wherein: the disturbance resistor (11) is hollow and is provided with an insulating and heat-insulating structure; the transmission optical fiber (23) passes through the disturbance resistor (11) and is connected with the fiber grating demodulation equipment (24).
8. The intelligent anti-islanding system with the automatic temperature measurement function according to claim 2, wherein: the fiber grating demodulation equipment (24) is a sensing analyzer based on a fiber MEMS tunable filter, and the temperature data acquisition is set to be 1Hz/25Hz/50 Hz.
9. The intelligent anti-islanding system with the automatic temperature measurement function according to claim 2, wherein: two groups of operating switches (12) are arranged in parallel; three groups of disturbance resistors (11) are arranged in parallel; the fiber bragg grating sensors (21) are provided with three groups, and the three groups of fiber bragg grating sensors (21) are respectively arranged on the three groups of disturbance resistors (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067004.7A CN111162561A (en) | 2020-01-20 | 2020-01-20 | Intelligent anti-islanding system with automatic temperature measurement function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067004.7A CN111162561A (en) | 2020-01-20 | 2020-01-20 | Intelligent anti-islanding system with automatic temperature measurement function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111162561A true CN111162561A (en) | 2020-05-15 |
Family
ID=70564646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010067004.7A Pending CN111162561A (en) | 2020-01-20 | 2020-01-20 | Intelligent anti-islanding system with automatic temperature measurement function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111162561A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113964859A (en) * | 2021-09-06 | 2022-01-21 | 国网浙江省电力有限公司台州供电公司 | Device for realizing anti-islanding |
-
2020
- 2020-01-20 CN CN202010067004.7A patent/CN111162561A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113964859A (en) * | 2021-09-06 | 2022-01-21 | 国网浙江省电力有限公司台州供电公司 | Device for realizing anti-islanding |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101639386B (en) | Load tap changer contact overheating fault diagnosis method and device | |
| CN101783204B (en) | Intelligent ultrahigh-voltage XLPE power cable capable of monitoring partial discharge on line | |
| AU2006351139B2 (en) | Method and system for fiber-optic monitoring of spatially distributed components | |
| US8488114B2 (en) | Method and system for fiber-optic monitoring of spatially distributed components | |
| CN103487162A (en) | High voltage equipment contact temperature online monitoring system based on optical fiber network | |
| CN106410739B (en) | A kind of arc light protecting device and its method for diagnosing faults | |
| CN111162561A (en) | Intelligent anti-islanding system with automatic temperature measurement function | |
| CN211556876U (en) | Intelligent anti-islanding system with automatic temperature measurement function | |
| CN202350949U (en) | Switch cabinet fiber grating temperature measuring system | |
| CN202562652U (en) | Online temperature measurement and alarm device of transformer substation high-tension switch cabinet | |
| CN110034538B (en) | Dry-type reactor non-electric quantity protection system | |
| CN104614641A (en) | Quasi-distributed FBG conductor fault positioning system and method | |
| Wang et al. | Temperature Monitoring of Distribution Transformer Windings Based on Fiber Bragg Grating Array | |
| CN207850564U (en) | Transmission line wire Temperature Distribution formula monitoring device based on BOTDA | |
| CN200980002Y (en) | A generator stator | |
| Rosolem et al. | Quantitative and qualitative monitoring system for switchgear with full electrical isolation using fiber-optic technology | |
| Dong et al. | On line monitoring of substation equipment temperature based on fiber Bragg grating | |
| CN103346512A (en) | Intelligent type bus duct | |
| CN208488187U (en) | Fiber grating temperature sensor monitoring device for rail vehicle electric connecting point | |
| CN202836823U (en) | On-line security integrated monitoring and early warning system for power cable tunnel | |
| CN201527833U (en) | Intelligent ultrahigh voltage XLPE power cable capable of enabling partial discharge to be online monitored | |
| CN115585906A (en) | Fiber bragg grating temperature measurement system for high-voltage switch cabinet and installation method | |
| WO2019153478A1 (en) | High-voltage switchgear having defect monitoring and comprehensive control functions | |
| KR101800360B1 (en) | Optical Current Transformer for Verifying Voltage Integrity at Switchgear | |
| CN103162861A (en) | Switch cabinet fiber grating temperature measuring system |
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 |