CN114189209A - Photovoltaic power generation system operation parameter detection method - Google Patents
Photovoltaic power generation system operation parameter detection method Download PDFInfo
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- CN114189209A CN114189209A CN202010984579.5A CN202010984579A CN114189209A CN 114189209 A CN114189209 A CN 114189209A CN 202010984579 A CN202010984579 A CN 202010984579A CN 114189209 A CN114189209 A CN 114189209A
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- 238000010248 power generation Methods 0.000 title claims abstract description 85
- 238000001514 detection method Methods 0.000 title description 5
- 238000012360 testing method Methods 0.000 claims abstract description 63
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000010998 test method Methods 0.000 claims description 8
- 230000006870 function Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention relates to a method for detecting operation parameters of a photovoltaic power generation system, which is characterized in that a power grid simulator is connected before the photovoltaic power generation system is connected to the Internet, the collection of operation data of the photovoltaic power generation system under the fault condition is completed on the premise of not influencing the operation of the power grid, the output of a photovoltaic inverter of a grid-connected unit of the photovoltaic power generation system is stopped when in test wiring, the test system is connected to an Internet line of the photovoltaic power generation system in series, the photovoltaic inverter outputs alternating current and is connected to a test system incoming line breaker after being boosted, the alternating current and the alternating current are connected to the test system incoming line breaker in series and are connected to the power grid simulator after being reduced in voltage by a step-down transformer, the power grid simulator simulates power grid faults of different types of single phase, two phase and three phase and power grid system frequency faults, the voltage of the single phase, two phase and three phase power grid faults are recovered to the Internet voltage level through the step-up transformer, and the power grid is connected to the power grid after the Internet breaker. The method can play a key role in constructing the grid structure with larger installed photovoltaic power generation capacity in operation.
Description
Technical Field
The invention relates to the field of detection of photovoltaic power generation systems, in particular to a method for detecting operation parameters of a photovoltaic power generation system.
Background
In recent years, China strongly supports the development of new energy technology, and with the rapid increase of the installed proportion of solar photovoltaic power generation, as with a wind generating set, an electric power system puts forward requirements on the operation capacity of a large and medium-sized photovoltaic power station connected to a power grid when the power grid has transient faults, and the national standard 'technical regulation for connecting photovoltaic power stations to the power grid' clearly requires that the large and medium-sized photovoltaic power station has fault ride-through capacity. Because the control methods of the photovoltaic inverters through fault ride-through are slightly different, when the power grid fails, the reactions of the photovoltaic power generation system are different, the photovoltaic power station operation system is established to have higher accuracy for identifying the operation parameters of the photovoltaic power generation system, and then the photovoltaic power generation system can be established to operate more accurately. By 2013, the installed photovoltaic power generation capacity of the Qinghai power grid accounts for 15% of the total installed photovoltaic power generation capacity of the Qinghai power grid, and the accuracy of photovoltaic power generation operation has important influence on the calculation and analysis of the power grid.
At present, the operation parameter identification data for the photovoltaic power generation system are all derived from the operation data of the photovoltaic power generation system, and can normally reflect the normal operation state of the photovoltaic power generation system, but the transient state condition of the photovoltaic power generation system when the power grid fails is hardly reflected, and the key is that the operation data of the photovoltaic power generation system when the power grid fails is lacked when the operation parameter identification of the photovoltaic power generation system is carried out.
In view of this, the invention provides a method for detecting operating parameters of a photovoltaic power generation system, so as to meet the requirements of practical application.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defect that the transient fault of the power grid cannot be reflected by the identification of the operation parameters of the photovoltaic power generation system, the invention provides a novel operation parameter data testing method, which can fully measure the operation data of the photovoltaic power generation system when the power grids of different types fail, can provide full operation data of the photovoltaic power generation system when the fault occurs, and provides an accurate identification basis for the operation parameters of the photovoltaic power generation system when the power grids are in normal and fault states.
The technical scheme adopted by the invention is as follows: a method for detecting operation parameters of a photovoltaic power generation system is characterized by comprising the following steps: the test method adopts a power grid simulator as a main element of a test to realize the function of simulating the power grid faults, direct current collected by a solar cell panel is converted into three-phase alternating current by a photovoltaic inverter, and then is boosted by a box-type transformer and then is accessed into a power grid, the test method is characterized in that the power grid simulator is accessed before a photovoltaic power generation system is connected to the power grid, the collection of operation data of the photovoltaic power generation system under the fault condition is completed on the premise of not influencing the operation of the power grid, the output of the photovoltaic inverter of a grid-connected unit of the photovoltaic power generation system is stopped firstly when wiring is tested, the test system is connected into a power grid line of the photovoltaic power generation system in series, the photovoltaic inverter outputs alternating current and is boosted and then is connected into a test system incoming line breaker in series, the power grid simulator is connected into the power grid after the voltage is reduced by a step-down transformer, and the power grid simulator simulates the power grid faults and the frequency faults of single-phase, two-phase and three-phase different types, and then the voltage is restored to the level of the voltage on the Internet through the step-up transformer, and the voltage is connected to the power grid after passing through the circuit breaker on the Internet.
The low voltage ride through detection system suitable for the large photovoltaic power station in the high altitude area is characterized in that three test points are set in the test method, one test point is a test point at the direct current power supply side of the photovoltaic inverter, and an oscillography memory is adopted for test recording; one is that the photovoltaic power generation system adopts a high-precision electric quantity recording analyzer to carry out test recording through a test point at an outlet of a box-type transformer; and one is a test point at the grid-connected point of the photovoltaic power generation system, and a high-precision power analyzer is adopted for test recording.
The system is suitable for detecting the low voltage ride through of the large photovoltaic power station in the high altitude area, and is characterized in that after the preparation of the test equipment is completed, power in different stages is selected to be respectively tested, the test is started after the power of the photovoltaic power generation system to be tested is stable, the voltage amplitude and the expression time of single-phase fault, two-phase fault and three-phase fault at the grid-connected point of the photovoltaic power station are respectively set, test data and waveforms are recorded, each point is continuously tested twice, and the photovoltaic power generation system is determined to have the same operation capacity when the same power grid fault occurs; similarly, when the power grid has abnormal frequency faults, the fault frequency of the grid-connected point of the photovoltaic power station is set under the condition that the operation state of the power grid is not influenced, and test data and waveforms are recorded, so that the operation capacity of the photovoltaic power generation system under the condition of power grid frequency disturbance is determined.
The low voltage ride through detection system is suitable for the large photovoltaic power station in the high altitude area, and is characterized in that three test conditions of heavy load, light load and medium load are considered for power selection of a tested photovoltaic power generation system, wherein the heavy load is used when the power range is P & gt 0.8Pn, the light load is used when the power range is P & lt 0.3Pn, and the medium load is used when the power range is 0.3Pn & lt P & lt 0.8 Pn; selecting a common fault mode when the power system is operated and analyzed, calculating fault voltage, fault duration or fault frequency of a grid-connected point of the photovoltaic power generation system when the power grid is in fault, setting the grid-connected point voltage or frequency of the photovoltaic power generation system according to the method, and after the setting is finished, performing power grid disturbance simulation to obtain normal state operation data and fault state operation data of the photovoltaic power generation system with three measuring points.
The invention has the beneficial effects that: the method can be easily realized in the process of building the photovoltaic power generation performance test platform, the new test method increases the operation data of the photovoltaic power generation system in the fault state, and the accuracy of identifying the operation parameters of the photovoltaic power generation system is improved.
The data obtained by the new testing method provided by the invention has an extremely important effect on photovoltaic power generation system operation parameter modeling, and plays a key role in building a grid structure with larger photovoltaic power generation installed capacity for operation.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples. Various changes or modifications may be effected therein by one skilled in the art and such equivalents are intended to be within the scope of the invention as defined by the claims appended hereto.
The novel test method disclosed by the invention adopts a power grid simulator system for testing, and the obtained data is used for identifying and verifying the operation parameters of the photovoltaic power station. The invention provides a new testing method for obtaining operation data of a photovoltaic power generation system in the case of power grid faults, so that the operation conditions of the photovoltaic power generation system in different operation states of a power grid can be reflected more accurately when the operation parameters of the photovoltaic power generation system are identified.
The testing method of the invention adopts the power grid simulator as a main element of the test, and realizes the function of simulating the power grid fault. Direct current collected by the solar panel is converted into three-phase alternating current through the photovoltaic inverter, and then is boosted by the box-type transformer and then is connected to a power grid. The test method is characterized in that a power grid simulator is connected before the photovoltaic power generation system is connected to the internet, and the collection of operation data of the photovoltaic power generation system under the fault condition is completed on the premise of not influencing the operation of the power grid. When testing wiring, firstly stopping the output of a photovoltaic inverter of a grid-connected unit of a photovoltaic power generation system, connecting the testing system into an online line of the photovoltaic power generation system in series, connecting the photovoltaic inverter into a test system incoming line breaker after the output alternating current of the photovoltaic inverter is boosted in series, connecting the photovoltaic inverter into a power grid simulator after the output alternating current of the photovoltaic inverter is reduced in voltage by a step-down transformer, and simulating power grid faults and power grid system frequency faults of different types of single phase, two phase and three phase. And then the voltage is restored to the level of the voltage on the Internet through the step-up transformer, and the voltage is connected to the power grid after passing through the circuit breaker on the Internet.
The testing method is provided with three testing points, wherein one testing point is a testing point at the direct current power supply side of the photovoltaic inverter, and an oscillography memory is adopted for testing and recording; one is that the photovoltaic power generation system adopts a high-precision electric quantity recording analyzer to carry out test recording through a test point at an outlet of a box-type transformer; and one is a test point at the grid-connected point of the photovoltaic power generation system, and a high-precision power analyzer is adopted for test recording. After the test equipment is prepared, selecting different stage powers to respectively test, starting testing after the power of the tested photovoltaic power generation system is stable, respectively setting the voltage amplitude and the expression time of single-phase faults, two-phase faults and three-phase faults at the grid-connected point of the photovoltaic power station, recording test data and waveforms, continuously testing twice at each point, and determining that the photovoltaic power generation system has the same operation capacity when the same power grid faults occur. Similarly, when the power grid has frequency abnormal faults, the fault frequency of the grid-connected point of the photovoltaic power station can be set under the condition that the operation state of the power grid is not influenced, and test data and waveforms are recorded, so that the operation capacity of the photovoltaic power generation system under the condition of power grid frequency disturbance is determined.
The power selection of the tested photovoltaic power generation system at least considers three test conditions of heavy load, light load and medium load, wherein the power range is that the power is heavy load when P is more than 0.8Pn, the power range is light load when P is less than 0.3Pn, and the power range is medium load when P is more than 0.3Pn and less than 0.8 Pn. Selecting a common fault mode when the power system is operated and analyzed, calculating fault voltage, fault duration or fault frequency of a grid-connected point of the photovoltaic power generation system when the power grid is in fault, setting the grid-connected point voltage or frequency of the photovoltaic power generation system according to the method, and after the setting is finished, performing power grid disturbance simulation to obtain normal state operation data and fault state operation data of the photovoltaic power generation system with three measuring points.
The new data testing method disclosed by the invention can comprehensively reflect the running state of the photovoltaic power generation system when the power grid fails, improves the accuracy of identifying the running parameters of the photovoltaic power generation system, provides more accurate running of the photovoltaic power generation system for the running analysis of the power system, gradually improves the installed proportion in the power system along with the increase of the installed capacity of the photovoltaic power generation, and has very important function particularly when the photovoltaic power generation occupies a larger proportion in a local power grid.
The present invention is not limited to the above embodiments, and therefore, any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (4)
1. A method for detecting operation parameters of a photovoltaic power generation system adopts a power grid simulator as a main element of a test, realizes the function of simulating power grid faults, converts direct current collected by a solar panel into three-phase alternating current through a photovoltaic inverter, boosts the three-phase alternating current through a box-type transformer and then accesses a power grid, and is characterized in that: the test method comprises the steps that a power grid simulator is connected before a photovoltaic power generation system is connected to the Internet, collection of operation data of the photovoltaic power generation system under the condition of faults is completed on the premise that operation of the power grid is not influenced, output of a photovoltaic inverter of a grid-connected unit of the photovoltaic power generation system is stopped firstly during test wiring, the test system is connected to an Internet line of the photovoltaic power generation system in series, the photovoltaic inverter outputs alternating current and is connected to a test system incoming line breaker in series after being boosted, the alternating current is connected to the power grid simulator after being reduced in voltage by a step-down transformer, the power grid simulator simulates power grid faults and power grid system frequency faults of different types of single phase, two phase and three phase, voltage of the power grid simulator is recovered to an Internet voltage level through the step-up transformer, and the power grid is connected to the power grid after passing through an Internet breaker.
2. The method for detecting the operating parameters of the photovoltaic power generation system according to claim 1, wherein three test points are set in the test method, one test point is a test point on the direct current power supply side of the photovoltaic inverter, and an oscillography memory is used for test recording; one is that the photovoltaic power generation system adopts a high-precision electric quantity recording analyzer to carry out test recording through a test point at an outlet of a box-type transformer; and one is a test point at the grid-connected point of the photovoltaic power generation system, and a high-precision power analyzer is adopted for test recording.
3. The method for detecting the operation parameters of the photovoltaic power generation system according to claim 1, wherein after the test equipment is prepared, power in different stages is selected to be tested respectively, the test is started after the power of the photovoltaic power generation system to be tested is stabilized, the voltage amplitudes and the expression times of single-phase faults, two-phase faults and three-phase faults at the grid-connected point of the photovoltaic power station are set respectively, test data and waveforms are recorded, each point is tested twice continuously, and the photovoltaic power generation system is determined to have the same operation capability when the same grid faults occur; similarly, when the power grid has abnormal frequency faults, the fault frequency of the grid-connected point of the photovoltaic power station is set under the condition that the operation state of the power grid is not influenced, and test data and waveforms are recorded, so that the operation capacity of the photovoltaic power generation system under the condition of power grid frequency disturbance is determined.
4. The method for detecting the operation parameters of the photovoltaic power generation system according to claim 1, wherein three test conditions of heavy load, light load and medium load are taken into consideration for power selection of the photovoltaic power generation system to be detected, wherein the power range is that the power is heavy load when P is greater than 0.8Pn, the power is light load when P is less than 0.3Pn, and the power is medium load when P is less than 0.3Pn and less than 0.8 Pn; selecting a common fault mode when the power system is operated and analyzed, calculating fault voltage, fault duration or fault frequency of a grid-connected point of the photovoltaic power generation system when the power grid is in fault, setting the grid-connected point voltage or frequency of the photovoltaic power generation system according to the method, and after the setting is finished, performing power grid disturbance simulation to obtain normal state operation data and fault state operation data of the photovoltaic power generation system with three measuring points.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010984579.5A CN114189209A (en) | 2020-09-14 | 2020-09-14 | Photovoltaic power generation system operation parameter detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010984579.5A CN114189209A (en) | 2020-09-14 | 2020-09-14 | Photovoltaic power generation system operation parameter detection method |
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| CN114189209A true CN114189209A (en) | 2022-03-15 |
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| CN202010984579.5A Withdrawn CN114189209A (en) | 2020-09-14 | 2020-09-14 | Photovoltaic power generation system operation parameter detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114675108A (en) * | 2022-03-28 | 2022-06-28 | 无锡思信德精密科技有限公司 | Equipment capable of testing solar inverter on line |
-
2020
- 2020-09-14 CN CN202010984579.5A patent/CN114189209A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114675108A (en) * | 2022-03-28 | 2022-06-28 | 无锡思信德精密科技有限公司 | Equipment capable of testing solar inverter on line |
| CN114675108B (en) * | 2022-03-28 | 2023-09-22 | 无锡正元信息科技有限公司 | Equipment capable of testing solar inverter on line |
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