CN114784862A - Photovoltaic island protection method and system based on communication network - Google Patents
Photovoltaic island protection method and system based on communication network Download PDFInfo
- Publication number
- CN114784862A CN114784862A CN202210480885.4A CN202210480885A CN114784862A CN 114784862 A CN114784862 A CN 114784862A CN 202210480885 A CN202210480885 A CN 202210480885A CN 114784862 A CN114784862 A CN 114784862A
- Authority
- CN
- China
- Prior art keywords
- island
- detection
- communication network
- inverter
- microcomputer device
- 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
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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
-
- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
Abstract
The invention provides a photovoltaic island protection method and system based on a communication network, which comprises the following steps: carrying out first island detection on the anti-island microcomputer device; judging whether the result of the first island detection meets a first island characteristic standard or not; the anti-islanding microcomputer device issues an instruction to enable the inverter to generate disturbance quantity in the power grid; carrying out secondary island detection on the anti-island microcomputer device; and judging whether the result of the second island detection accords with a second island characteristic standard, if the island effect occurs in the photovoltaic power generation system, disconnecting the photovoltaic power generation system from the power grid, and controlling the inverter to stop running. According to the island detection method and device, the first detection standard is used as a switching basis of active detection, and the second detection standard is used as a final judgment basis of final island protection action, so that on one hand, the electric energy quality damage caused by the fact that the photovoltaic power generation system injects disturbance into a power grid for a long time can be avoided, and on the other hand, the speed and accuracy of island detection can be guaranteed.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a photovoltaic island protection method and system based on a communication network.
Background
Island protection is photovoltaic power plant relay protection's important content, requires when taking place the island effect, can amputate the grid-connected point fast, makes photovoltaic power plant and grid system side break away from rapidly to guarantee whole power station equipment and relevant maintainer's life safety.
The islanding detection method of the photovoltaic power station can be divided into an active type and a passive type. The passive detection is easy to realize, the quality and the stability of the system electric energy are not influenced, and the blind area is large when the detection is carried out according to a general threshold value. The active detection overcomes the defects of a passive method, reduces island detection blind areas and quickens the detection time. However, in the active method, disturbance quantity is added in the control signal of the inverter, so that the waveform of the output current of the inverter is distorted, and the power supply quality of the photovoltaic power generation system is influenced.
In the existing patent, an island detection method combining an active method and a passive method is provided, the matching degree of load power and photovoltaic power generation power needs to be detected, and in the actual engineering, under the condition that a local load is small or nonexistent, the photovoltaic power generation power and the load are not matched for a long time, so that the matching degree of the load power and the photovoltaic power generation power is not suitable to be used as the switching basis of the active method and the passive method. In addition, for the direct grid connection condition of a large photovoltaic power station, the load condition can hardly be detected.
Disclosure of Invention
In order to solve the technical problem, the invention provides a photovoltaic island protection method and system based on a communication network.
In a first aspect, the present disclosure provides a photovoltaic island protection method based on a communication network, including the following steps:
carrying out first island detection on the anti-island microcomputer device to obtain a first island detection result;
judging whether the result of the first island detection meets a first island characteristic standard or not according to the result of the first island detection; if so, the anti-islanding microcomputer device controls the inverter to operate through the communication network, and the inverter is used for generating disturbance quantity; otherwise, the anti-islanding microcomputer device continuously performs first islanding detection;
the anti-islanding microcomputer device carries out second islanding detection to obtain a second islanding detection result;
judging whether the result of the second island detection accords with a second island characteristic standard or not according to the result of the second island detection, if so, judging that the photovoltaic power generation system has an island effect, controlling the inverter to stop running through the communication network by the anti-island microcomputer device, stopping generating disturbance quantity by the inverter, and controlling a circuit breaker between the photovoltaic power generation system and a power grid to be disconnected by the anti-island microcomputer device through the communication network to finish island protection of the power grid; otherwise, the photovoltaic power generation system does not have the island effect, and the anti-island microcomputer device continuously performs first island detection.
In a second aspect, the present disclosure provides a photovoltaic island protection system based on a communication network, which includes an island-proof microcomputer device, a photovoltaic power generation system and a power grid;
the photovoltaic power generation system comprises an inverter; the anti-islanding microcomputer device is electrically connected with the inverter; the power grid is electrically connected with the photovoltaic power generation system;
the anti-islanding microcomputer device comprises a detection unit and a control unit; one end of the detection unit is in electrical signal connection with the secondary side of a boosting transformer of the photovoltaic power generation system, and the other end of the detection unit is in electrical signal connection with the input end of the control unit;
a breaker is arranged at the public end of the power grid and the photovoltaic power generation system; and the output end of the control unit is electrically connected with the circuit breaker.
The beneficial effects of the invention are: according to the invention, the first detection standard is used as a switching basis of active detection, and the second detection standard is used as a final judgment basis of final island protection action, the first island characteristic standard is detected for the first time, so that high-sensitivity detection is realized, the second island characteristic standard is detected for the second time, so that high-accuracy detection is realized, and the mode of combining the high-sensitivity detection and the high-accuracy detection for two times is adopted, so that the detection speed and accuracy are improved, and the island protection misoperation is avoided; the data transmission speed of island detection is improved by adopting a communication network mode, and the reaction speed of island detection is ensured; the anti-islanding microcomputer device controls the inverter to inject disturbance quantity into the generated power and stop running, and can avoid electric energy quality damage caused by long-time disturbance injection into a power grid.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the signal detected by the anti-islanding microcomputer device is a voltage signal of a secondary side of a booster transformer in the photovoltaic power generation system.
The beneficial effect of adopting the above further scheme is that the power grid island is judged through the detection signal of the secondary side of the step-up transformer, which is beneficial to avoiding the detection error caused by the isolation of the transformer on the primary side and improving the accuracy of the detection result.
Further, the anti-islanding microcomputer device controls the inverter to operate through a communication network, and comprises: the anti-islanding microcomputer device generates a first control instruction and sends the first control instruction to the inverter through the communication network, and the inverter receives and executes the first control instruction and then operates; the anti-islanding microcomputer device controls the inverter to stop running through the communication network, and comprises: the anti-islanding microcomputer device generates a second control instruction and sends the second control instruction to the inverter through the communication network; the inverter stops running after receiving and executing the second control instruction; the first control instruction is different from the second control instruction.
The anti-islanding microcomputer device has the advantages that the inverter is controlled to operate through the first control instruction in the first islanding detection, and the inverter is controlled to stop operating through the second control instruction in the second islanding detection, so that the electric energy quality damage caused by long-time disturbance injection to the power grid can be avoided.
Further, the communication network is a 5G network or an optical fiber communication network.
The beneficial effect of adopting above-mentioned further scheme is that, through the high-speed communication mode of 5G network or fiber communication network, the disconnection of control circuit breaker that can be more rapid guarantees the transmission speed of data, is favorable to improving the reaction rate of system.
Further, the first island detection and the second island detection comprise detection of overvoltage, undervoltage, over-frequency, under-frequency and total harmonic distortion; the first island feature comprises: the overvoltage protection circuit comprises a first overvoltage range, a first undervoltage range, a first over-frequency range, a first under-frequency range and a first total harmonic distortion range; and the second island characteristic is set according to the voltage grade and the power grid capacity of the power grid and comprises a second overvoltage range, a second undervoltage range, a second over-frequency range, a second under-frequency range and a second total harmonic distortion range.
The beneficial effect who adopts above-mentioned further scheme is that, through the combination of first island detection and second island detection, detect excessive pressure, undervoltage, cross-frequency, under-frequency and total harmonic distortion, utilize different standards to judge whether island effect appears in the electric wire netting, carry out the first detection as the coarse detection with second island characteristic standard, carry out the second detection as the fine detection with second island characteristic standard, through the mode that the two detection of coarse detection and fine detection combine, be favorable to improving the speed and the degree of accuracy that detect.
Drawings
Fig. 1 is a flowchart of a photovoltaic island protection method based on a communication network according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a photovoltaic island protection device based on a communication network according to embodiment 2 of the present invention.
Icon: an N-inverter; g, a power distribution cabinet; a T-step up transformer; an L-breaker; z-anti-islanding microcomputer devices; s-a power grid; w-photovoltaic power generation system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
The embodiment provides a photovoltaic island protection method based on a communication network, which comprises the following steps:
carrying out first island detection by the anti-island microcomputer device Z to obtain a first island detection result;
judging whether the result of the first island detection meets a first island characteristic standard or not according to the result of the first island detection; if so, controlling the inverter N to operate by the anti-islanding microcomputer device Z through a communication network, and generating disturbance quantity by using the inverter N; otherwise, the anti-islanding microcomputer device Z continuously performs the first islanding detection;
carrying out second island detection on the anti-island microcomputer device Z to obtain a second island detection result;
judging whether the result of the second island detection accords with a second island characteristic standard or not according to the result of the second island detection, if so, judging that the photovoltaic power generation system W has an island effect, controlling an inverter N to stop running through a communication network by an island prevention microcomputer device Z, stopping the inverter N from generating disturbance quantity in the photovoltaic power generation system W, and controlling a circuit breaker between the photovoltaic power generation system and a power grid to be disconnected through the communication network by the island prevention microcomputer device to finish island protection of the power grid S; otherwise, the photovoltaic power generation system W does not have an island effect, and the anti-island microcomputer device Z continuously performs first island detection.
According to the invention, the first detection standard is used as a switching basis of active detection, and the second detection standard is used as a final judgment basis of final island protection action, the first island characteristic standard is detected for the first time, so that high-sensitivity detection is realized, the second island characteristic standard is detected for the second time, so that high-accuracy detection is realized, and the mode of combining the high-sensitivity detection and the high-accuracy detection for two times is adopted, so that the detection speed and accuracy are improved, and the island protection misoperation is avoided; the data transmission speed of island detection is improved by adopting a communication network mode, and the reaction speed of island detection is ensured; the anti-islanding microcomputer device controls the inverter to run and stop running, and can avoid the power quality damage of the power grid caused by long-time disturbance injection to the power grid S.
Optionally, the signal detected by the anti-islanding microcomputer device Z is a voltage signal of the secondary side of the step-up transformer T in the power grid S.
In the traditional method, the islanding detection of photovoltaic power generation is realized mainly by depending on an islanding detection module in an inverter N, but in practical engineering, measurement signals received by the inverter N in a large photovoltaic power station are mainly three-phase voltage and current measured near the primary side of a transformer of the photovoltaic power station. Due to the isolation effect of the transformer, a large error may exist in the photovoltaic power generation system W island judged by the detection signal on the primary side.
In this embodiment, the signal detected by the anti-islanding microcomputer device Z is a voltage signal of the secondary side of the step-up transformer T in the photovoltaic power generation system W, and the islanding of the photovoltaic power generation system W is determined by the detection signal of the secondary side of the step-up transformer T, which is beneficial to avoiding the detection error caused by the isolation effect of the transformer at the primary side, and improving the accuracy of the detection result.
Optionally, the anti-islanding microcomputer device controls the inverter to operate through a communication network, and includes: the anti-islanding microcomputer device generates a first control instruction and sends the first control instruction to the inverter through the communication network, and the inverter receives and executes the first control instruction and then operates; the anti-islanding microcomputer device controls the inverter to stop running through a communication network, and comprises: the anti-islanding microcomputer device generates a second control instruction and sends the second control instruction to the inverter through the communication network; the inverter stops running after receiving and executing the second control instruction; the first control instruction is different from the second control instruction.
In the practical application process, the anti-islanding microcomputer device controls the inverter to operate through the first control instruction in the first islanding detection, and controls the inverter to stop operating through the second control instruction in the second islanding detection, so that the electric energy quality damage caused by long-time disturbance injection to the power grid can be avoided.
Optionally, the communication network is a 5G network or an optical fiber communication network.
In the practical application process, the communication network is a 5G network or an optical fiber communication network, the end-to-end time delay is within tens of milliseconds, the communication blocking probability is extremely low, the reliability is high, and the rapid switching, the breaker action control and the inverter N control which can not finish the detection of the active method by the passive method can be avoided.
Optionally, the second island characteristic standard is specifically: the overvoltage threshold value is 2%, the undervoltage threshold value is 2%, the overfrequency threshold value is 0.2HZ, the underfrequency threshold value is 0.2HZ, and the total harmonic distortion THD threshold value is 3%. The second island characteristic standard is smaller than the second island characteristic standard, and the island detection sensitivity is favorably ensured. Optionally, the first island detection method may be a Sandia voltage shift method (SVS), and the detection blind area is small and the detection speed is high.
Optionally, the second island feature standard specifically includes: the overvoltage threshold value is 5%, the undervoltage threshold value is 5%, the overfrequency threshold value is 0.5HZ, the underfrequency threshold value is 0.5HZ, and the total harmonic distortion THD threshold value is 5%. The second island characteristic standard is larger than the second island characteristic standard, so that misjudgment caused by inaccuracy of first detection is avoided, and the accuracy of island effect judgment is improved.
Optionally, the first island detection and the second island detection both include detection of overvoltage, undervoltage, overfrequency, underfrequency and total harmonic distortion; the first island feature comprises: the first overvoltage range, the first undervoltage range, the first overfrequency range, the first underfrequency range and the first total harmonic distortion range; the second island characteristic is set according to the voltage grade of the power grid S and the capacity of the power grid S and comprises a second overvoltage range, a second undervoltage range, a second overfrequency range, a second underfrequency range and a second total harmonic distortion range.
In the practical application in-process, through first island detection and the second island detection combination, detect excessive pressure, undervoltage, cross-frequency, under-frequency and total harmonic distortion, utilize different standards to judge whether the isolated island effect appears in photovoltaic power generation system W, carry out the first detection as the coarse detection with second island characteristic standard, carry out the second detection as the fine detection with second island characteristic standard, through the coarse detection with the twice mode that detects of fine detection and combine, be favorable to improving the speed and the degree of accuracy that detect.
Optionally, the control unit is electrically connected to the circuit breaker L. The breaker L is installed at a PCC (Point of Common Coupling) where the photovoltaic power generation system W is connected to the grid S, and is used for disconnecting the photovoltaic power generation system W from the grid S. The control unit realizes the connection of the photovoltaic power generation system W and the power grid S through the circuit breaker L, and realizes the anti-islanding protection of the power grid S. In addition, optionally, the control unit issues an instruction to control all the inverters N to stop power output. Optionally, the control unit employs a microprocessor.
Example 2
Based on the same principle as the method shown in embodiment 1 of the present invention, on the basis of the method shown in embodiment 1 of the present invention, a photovoltaic island protection system based on a communication network is further provided in the embodiment of the present invention, as shown in fig. 2, the system includes an island prevention microcomputer device Z, a photovoltaic power generation system W and a power grid S;
the photovoltaic power generation system W includes an inverter N; the anti-islanding microcomputer device Z is electrically connected with the inverter N; the power grid S is electrically connected with the photovoltaic power generation system W;
the anti-islanding microcomputer device Z comprises a detection unit and a control unit; one end of the detection unit is in electrical signal connection with the secondary side of a boosting transformer T of the photovoltaic power generation system W, and the other end of the detection unit is in electrical signal connection with the input end of the control unit;
a breaker L is arranged at the public end of the power grid S and the photovoltaic power generation system W; the output end of the control unit is connected with the circuit breaker L through an electric signal.
Optionally, the control unit is electrically connected with the inverter N; the control unit issues an instruction to control the inverter N to operate or stop operating.
Optionally, the photovoltaic power generation system W inverter is connected with a power distribution cabinet G; the power distribution cabinet G is electrically connected with the primary side of the step-up transformer T; the secondary side of the step-up transformer T is electrically connected to the circuit breaker L. And the inverter N is connected with a power distribution cabinet G in the photovoltaic power generation system W.
Optionally, a breaker L is arranged at a common end of the photovoltaic power generation system W and the power grid S; the control unit is connected with the circuit breaker L through an electric signal. The control unit is connected with the circuit breaker L and disconnects the photovoltaic power generation system W from the power grid S by controlling the circuit breaker L to act, so that the anti-islanding protection of the power grid S is realized.
Optionally, the detection unit includes a voltage detection unit, a current detection unit, and a harmonic detection unit, and the voltage detection unit includes a voltage sensor and a voltage transmitter; the voltage sensor and the voltage transmitter are in electric signal connection with the control unit. The current detection unit comprises a current sensor and a current transmitter, and the current sensor is in electric signal connection with the control unit through the current transmitter; the harmonic detection unit adopts a harmonic detector, the harmonic detector is electrically connected with the control unit, and data obtained by harmonic detection is transmitted to the control unit. Optionally, the control unit employs a microprocessor. The control unit obtains data such as overvoltage, undervoltage, over-frequency and under-frequency, harmonic and the like according to the data detected by the detection unit.
Optionally, the detection unit is arranged on the secondary side of a step-up transformer T of the photovoltaic power generation system W, a signal detected by the anti-islanding microcomputer device Z is a voltage signal of the secondary side of the step-up transformer T in the photovoltaic power generation system W, and the islanding of the photovoltaic power generation system W is judged by detecting the signal of the secondary side of the step-up transformer T, so that detection errors caused by the isolation effect of the transformer on the primary side are avoided, and the accuracy of a detection result is improved.
Optionally, the communication network is a 5G network or an optical fiber communication network, the end-to-end delay is within tens of milliseconds, the communication blocking probability is extremely low, the reliability is high, and the situations that the rapid switching, the breaker action control and the inverter N action control of the active method detection cannot be completed by a passive method can be avoided.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A photovoltaic island protection method based on a communication network is characterized by comprising the following steps:
carrying out first island detection on the anti-island microcomputer device to obtain a first island detection result;
judging whether the result of the first island detection meets a first island characteristic standard or not according to the result of the first island detection; if so, the anti-islanding microcomputer device controls the inverter to operate through the communication network, and the inverter is used for generating disturbance quantity; otherwise, the anti-islanding microcomputer device continuously performs first islanding detection;
the anti-islanding microcomputer device carries out second islanding detection to obtain a second islanding detection result;
judging whether the result of the second island detection accords with a second island characteristic standard or not according to the result of the second island detection, if so, judging that the photovoltaic power generation system has an island effect, controlling the inverter to stop running through the communication network by the anti-island microcomputer device, and controlling a circuit breaker between the photovoltaic power generation system and a power grid to be disconnected by the anti-island microcomputer device through the communication network to finish island protection on the power grid; otherwise, the photovoltaic power generation system W does not have an island effect, and the anti-island microcomputer device continuously performs first island detection.
2. The communication network-based photovoltaic island protection method according to claim 1, wherein the signal detected by the anti-island microcomputer device is a voltage signal of a secondary side of a step-up transformer in the power grid.
3. The photovoltaic island protection method based on the communication network according to claim 1, wherein the anti-island microcomputer device controls an inverter to operate through the communication network, and the method comprises the following steps: the anti-islanding microcomputer device generates a first control instruction and sends the first control instruction to the inverter through the communication network, and the inverter receives and executes the first control instruction and then operates; the anti-islanding microcomputer device controls the inverter to stop running through the communication network, and comprises: the anti-islanding microcomputer device generates a second control instruction and sends the second control instruction to the inverter through the communication network; the inverter stops running after receiving and executing the second control instruction; the first control instruction is different from the second control instruction.
4. The method for photovoltaic island protection based on a communication network according to any one of claims 1 to 3, wherein the communication network is a 5G network or a fiber optic communication network.
5. The communication network-based photovoltaic island protection method according to claim 1, wherein the first island detection and the second island detection both comprise overvoltage, undervoltage, over-frequency, under-frequency and total harmonic distortion detection; the first island feature comprises: the first overvoltage range, the first undervoltage range, the first overfrequency range, the first underfrequency range and the first total harmonic distortion range; and the second island characteristic is set according to the voltage grade and the power grid capacity of the power grid and comprises a second overvoltage range, a second undervoltage range, a second over-frequency range, a second under-frequency range and a second total harmonic distortion range.
6. A photovoltaic island protection system based on a communication network is characterized by comprising an island prevention microcomputer device, a photovoltaic power generation system and a power grid;
the photovoltaic power generation system comprises an inverter; the anti-islanding microcomputer device is electrically connected with the inverter; the power grid is electrically connected with the photovoltaic power generation system;
the anti-islanding microcomputer device comprises a detection unit and a control unit; one end of the detection unit is in electrical signal connection with the secondary side of a boosting transformer of the photovoltaic power generation system, and the other end of the detection unit is in electrical signal connection with the input end of the control unit;
a circuit breaker is arranged at the common end of the power grid and the photovoltaic power generation system; and the output end of the control unit is electrically connected with the circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210480885.4A CN114784862A (en) | 2022-05-05 | 2022-05-05 | Photovoltaic island protection method and system based on communication network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210480885.4A CN114784862A (en) | 2022-05-05 | 2022-05-05 | Photovoltaic island protection method and system based on communication network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114784862A true CN114784862A (en) | 2022-07-22 |
Family
ID=82434367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210480885.4A Pending CN114784862A (en) | 2022-05-05 | 2022-05-05 | Photovoltaic island protection method and system based on communication network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114784862A (en) |
-
2022
- 2022-05-05 CN CN202210480885.4A patent/CN114784862A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1926844B1 (en) | Method for detecting islanding operation of a distributed generator | |
| US9494637B2 (en) | Method for detecting islanding operation of distributed power generator | |
| RU2562243C1 (en) | Detection and localisation of faults in power supply line powered from one side | |
| US7840313B2 (en) | Grid interconnection device, grid interconnection system, and electric power control system | |
| CN107422196B (en) | Island detection method based on harmonic distortion rate and frequency | |
| Ropp et al. | Discussion of a power line carrier communications-based anti-islanding scheme using a commercial automatic meter reading system | |
| EP3079217A1 (en) | Method for detecting islanding in grid connected power generation systems and related dc/ac converter apparatus | |
| CN111103484B (en) | Island detection method, device and system based on hybrid power feedback disturbance | |
| CN103091604B (en) | A kind of island detection method of grid-connected photovoltaic system and pick-up unit | |
| US5162964A (en) | Connection control device for controlling the connection of small generator unit to electric power system | |
| US20230078605A1 (en) | Method of and system for detecting a serial arc fault in a power circuit | |
| CN106992505A (en) | A kind of platform area anti-islanding protection system | |
| CN112636312B (en) | Micro-grid protection method based on injected zero-sequence characteristic signal | |
| Quoc-Tuan | New methods of islanding detection for photovoltaic inverters | |
| CN206775117U (en) | A kind of taiwan area anti-islanding protection system based on low pressure carrier wave | |
| US20150233982A1 (en) | Detection of load-shedding of an inverter | |
| CN103887811A (en) | Distributed power supply system and control method with low voltage ride through and anti-islanding protective functions | |
| WO2020068024A2 (en) | The smart circuit breaker for grid connected residential photovoltaic systems | |
| CN114784862A (en) | Photovoltaic island protection method and system based on communication network | |
| CN103475022A (en) | Photovoltaic power station system with low voltage ride through and anti-islanding protection functions | |
| Hariprasad et al. | Review of islanding detection methods for distribution generation | |
| CN112117777A (en) | Photovoltaic grid-connected island detection method based on injected zero-sequence current | |
| US11728676B2 (en) | Power conversion device, control device, server and system | |
| Artale et al. | Enhanced islanding detection in smart interface protection systems of distributed generation | |
| Mukarram et al. | Comparative study on islanding detection of the photovoltaic grid connected 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 |