CN219937959U - Photovoltaic power plant dc-to-ac converter is from net automatic switching device that is incorporated into power networks - Google Patents
Photovoltaic power plant dc-to-ac converter is from net automatic switching device that is incorporated into power networks Download PDFInfo
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- CN219937959U CN219937959U CN202320927245.3U CN202320927245U CN219937959U CN 219937959 U CN219937959 U CN 219937959U CN 202320927245 U CN202320927245 U CN 202320927245U CN 219937959 U CN219937959 U CN 219937959U
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- 238000006243 chemical reaction Methods 0.000 claims description 41
- 230000001131 transforming effect Effects 0.000 claims description 4
- 238000010248 power generation Methods 0.000 abstract description 11
- 230000005611 electricity Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000000819 phase cycle Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
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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
Abstract
The utility model provides an off-grid automatic switching device of a photovoltaic power station inverter, which comprises the following components: the power supply comprises a first circuit breaker, a second circuit breaker, a third circuit breaker, a collector line alternating current voltage signal processing unit, a primary voltage transformation high-voltage alternating current voltage signal processing unit, an inversion alternating current voltage signal processing unit, a collector direct current voltage signal processing unit and an opening controller, wherein the first circuit breaker, the second circuit breaker, the third circuit breaker, the collector line alternating current voltage signal processing unit, the primary voltage transformation high-voltage alternating current voltage signal processing unit, the inversion alternating current voltage signal processing unit, the collector direct current voltage signal processing unit and an inverter start-stop switch are electrically connected with the opening controller. According to the utility model, the detected voltage signals are analyzed by the cut-off controller, and the cut-off of the first breaker, the second breaker and the third breaker is controlled, so that the automatic off-grid connection of the photovoltaic power generation system is realized.
Description
Technical Field
The utility model relates to the technical field of off-grid connection of photovoltaic power stations, in particular to an off-grid connection and disconnection device of an inverter of a photovoltaic power station.
Background
The photovoltaic power station generates electricity in daytime and stops running at night, but the photovoltaic power station cannot generate electricity, the inverter and the transformer run in no-load mode, equipment is not only lost, but also night off-grid electricity fee can be generated, and the operation cost of a photovoltaic power generation enterprise is increased. For example, 1 1000kVA box transformer substation has a night no-load loss of 1250W, the night no-load operation is carried out for 8 hours, the night loss is 1250 x 8 = 10000WH, namely 10kWH, an 80MW photovoltaic power station is taken as an example, the day and night loss is about 800kWH, the daily night loss electricity fee is 800 x 0.4684 = 374.72 yuan, the annual loss is 374.72 x 365 = 136772.8 yuan, and the 10-year loss can reach 136.77 ten thousand yuan according to 0.4684 yuan per degree of electricity. With the gradual decrease of the photovoltaic electricity price in the future, the scale of the power station is continuously increased, so that the investment yield of the power station is ensured, and a solving method is provided for project investment feasibility by reducing the operation cost of the power station.
Therefore, a device capable of realizing automatic grid-connected power generation in the daytime and automatic off-grid in the evening of the photovoltaic power station is necessary to design.
Disclosure of Invention
The utility model provides an off-grid automatic switching-off device of a photovoltaic power station inverter, which aims to solve the technical problems in the prior art, and provides the off-grid automatic switching-off device of the photovoltaic power station inverter.
The utility model relates to an off-grid and grid-connected automatic switching device of a photovoltaic power station inverter, which comprises the following specific steps:
an off-grid and grid-connected automatic switching device for a photovoltaic power station inverter, the device comprising: the device comprises a first circuit breaker, a second circuit breaker, a third circuit breaker, a collector line alternating current voltage signal processing unit, a primary transformation high-voltage alternating current voltage signal processing unit, an inversion alternating current voltage signal processing unit, a collector direct current voltage signal processing unit and an opening controller;
the first breaker is arranged between the primary transformer and the secondary transformer; the second circuit breaker is arranged between the primary transformer and the inverter; the third circuit breaker is arranged between the inverter and the combiner box;
the current collecting line alternating current voltage signal processing unit is used for detecting and processing alternating current voltage signals between the secondary transformer and the first circuit breaker;
the primary transformation high-voltage alternating-current voltage signal processing unit is used for detecting and processing alternating-current voltage signals between the first circuit breaker and the primary transformer;
the inversion alternating-current voltage signal processing unit is used for detecting and processing alternating-current voltage signals between the primary transformer and the inverter;
the converging direct-current voltage signal processing unit is used for detecting and processing alternating-current voltage signals between the inverter and the converging box;
the first circuit breaker, the second circuit breaker, the third circuit breaker, the collector line alternating current voltage signal processing unit, the primary transformation high-voltage alternating current voltage signal processing unit, the inversion alternating current voltage signal processing unit, the collector direct current voltage signal processing unit and the inverter start-stop switch are electrically connected with the start-stop controller.
Further, the collector line ac voltage signal processing unit includes a first voltage sensor and a first a/D conversion module, and a first digital signal processing module, where the first voltage sensor is configured to detect an ac voltage between the secondary transformer and the first circuit breaker, and the first a/D conversion module is electrically connected with the first voltage sensor and is configured to convert the collector line ac voltage signal into a digital signal, and the first digital signal processing module is electrically connected with the first a/D conversion module and is configured to process the collector line ac voltage signal digital signal.
Further, the primary transformation high-voltage alternating-current voltage signal processing unit comprises a second voltage sensor and a second A/D conversion module, wherein the second voltage sensor is used for detecting alternating-current voltage signals between the primary transformer and the first circuit breaker, the second A/D conversion module is electrically connected with the first voltage sensor and is used for converting the primary transformation high-voltage alternating-current voltage signals into digital signals, and the second digital signal processing module is electrically connected with the second A/D conversion module and is used for processing the digital signals.
Further, the inversion alternating voltage signal processing unit comprises a third voltage sensor and a third A/D conversion module, wherein the third voltage sensor is used for detecting alternating voltage signals between the primary transformer and the inverter, the third A/D conversion module is electrically connected with the third voltage sensor and is used for converting the inversion alternating voltage signals into digital signals, and the third digital signal processing module is electrically connected with the third A/D conversion module and is used for processing the digital signals.
Further, the converging direct-current voltage signal processing unit comprises a fourth voltage sensor, a fourth A/D conversion module and a fourth digital signal processing module, wherein the fourth voltage sensor is used for detecting direct-current voltage signals between the converging box and the inverter, the fourth A/D conversion module is electrically connected with the fourth voltage sensor and is used for converting the converging direct-current voltage signals into digital signals, and the fourth digital signal processing module is electrically connected with the fourth A/D conversion module and is used for processing the digital signals.
Further, the first voltage sensor, the second voltage sensor, the third voltage sensor and the fourth voltage sensor are one of a voltage transformer or a Hall voltage sensor.
Further, the first digital signal processing module, the second digital signal processing module, the third digital signal processing module, the fourth digital signal processing module, the first circuit breaker and the inverter start-stop switch are electrically connected with the on-off controller.
The utility model has the technical effects that:
1. according to the utility model, when the direct-current voltage of the junction box is larger than the preset starting voltage threshold value of the inverter, the switching controller firstly controls the third circuit breaker to be closed, then the switching controller controls the starting and stopping switch of the inverter to be started, the switching controller controls the second circuit breaker to be closed, and when the phases, the equal sequences, the equal amplitudes and the like of alternating-current voltages between the second-stage transformer and the first circuit breaker and between the first circuit breaker and the first-stage transformer are equal, the switching controller controls the first circuit breaker to be connected in a grid. When the direct current voltage signal processing unit detects that the direct current voltage of the bus box is smaller than the running voltage threshold value of the inverter preset by the switching-off controller, and after the state duration exceeds the preset limiting time, the switching-off controller controls the third circuit breaker to be switched off, and the switching-off controller controls the inverter to switch on and off, when the voltage signals detected by the inversion alternating current voltage signal processing unit and the primary voltage transformation high-voltage alternating current voltage signal processing unit are inconsistent, the switching-off controller controls the second circuit breaker to switch off, and at the moment, the alternating current voltage phase, the phase sequence, the amplitude and the like between the two-stage transformer and the first circuit breaker and between the first circuit breaker and the primary transformer are also different, and the switching-off controller controls the first circuit breaker to switch off, so that off-grid is realized. When the photovoltaic module generates electricity abnormally, the converging direct-current voltage signal processing unit detects that the direct-current voltage of the converging box is smaller than an inverter running voltage threshold value preset by the switching-off controller, and after the state duration exceeds the preset limiting time, the switching-off controller controls an inverter start-stop switch to be closed, and at the moment, the local photovoltaic module is off-grid. Therefore, off-grid of the photovoltaic system and the inverter in cloudy days, abnormal power generation or at night is realized, and automatic grid connection of the photovoltaic system in daytime is realized.
2. According to the utility model, the first circuit breaker, the second circuit breaker and the third circuit breaker are arranged, so that the inverter and the primary transformer in the photovoltaic power station system can be independently arranged off-grid, the off-grid arrangement of the local inverter and the primary transformer is adapted to the abnormal condition of the photovoltaic module, and the normal grid-connected operation of other photovoltaic modules is ensured when the local photovoltaic module is abnormal.
Drawings
Figure 1 is a schematic diagram of the structure of the photovoltaic power station inverter off-grid and grid-connected automatic switching device applied to a photovoltaic power generation system,
in the figure, a primary transformer 120, a secondary transformer 110; the photovoltaic module comprises an inverter 130, a junction box 140, a photovoltaic module 150, a first voltage sensor 211, a first A/D conversion module 212, a first digital signal processing module 213, a first voltage sensor 211, a second voltage sensor 221, a second A/D conversion module 222, a second digital signal processing module 223, a third voltage sensor 231, a third A/D conversion module 232, a third digital signal processing module 233, a fourth voltage sensor 241, a fourth A/D conversion module 242, a fourth digital signal processing module 243, an open-circuit controller 251, a first circuit breaker 252, a second circuit breaker 253 and a third circuit breaker 254.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the off-grid automatic switching device of the photovoltaic power station inverter according to the embodiment is applied to a photovoltaic power generation system, the photovoltaic power generation system comprises a photovoltaic module 150, a combiner box 140 for combining electricity generated by the photovoltaic module, an inverter for converting the combined direct current into alternating current, a primary transformer for boosting the alternating voltage of the inverter to 35kV, a first circuit breaker 252 for switching off the photovoltaic power generation system and the mains supply and realizing off-grid control, and a secondary transformer for boosting the alternating current of 35kV to 220kV, wherein the power output by the primary transformer in the distributed inversion and concentrated grid connection is transmitted to a current collecting line of an alternating current transmission line of a power generation busbar in the photovoltaic power generation system.
The photovoltaic power plant inverter off-grid automatic switching-off device of this embodiment includes: the first circuit breaker 252, the second circuit breaker 253, the third circuit breaker 254, the collector line ac voltage signal processing unit, the primary voltage transformation high voltage ac voltage signal processing unit, the inverter ac voltage signal processing unit, the collector dc voltage signal processing unit, and the on-off controller 251;
the first circuit breaker 252 is disposed between the primary transformer 120 and the secondary transformer 110; the second circuit breaker 253 is disposed between the primary transformer 120 and the inverter 130; the third circuit breaker 254 is disposed between the inverter 130 and the junction box 140;
the collector line ac voltage signal processing unit is configured to detect and process an ac voltage signal between the secondary transformer 110 and the first circuit breaker 252;
the primary transforming high voltage ac voltage signal processing unit is configured to detect and process an ac voltage signal between the first circuit breaker 252 and the primary transformer 120;
the inverter ac voltage signal processing unit is configured to detect and process an ac voltage signal between the primary transformer 120 and the inverter 130;
the bus dc voltage signal processing unit is configured to detect and process an ac voltage signal between the inverter 130 and the bus box 140;
the first circuit breaker 252, the second circuit breaker 253, the third circuit breaker 254, the collector line ac voltage signal processing unit, the primary transforming high voltage ac voltage signal processing unit, the inverter ac voltage signal processing unit, the collector dc voltage signal processing unit, and the on-off switch of the inverter 130 are all electrically connected to the on-off controller 251.
Specifically, the grid-connected condition of the present embodiment is that the phase, the phase sequence, the amplitude, and the like of the ac voltage between the secondary transformer 110 and the first circuit breaker 252, and between the first circuit breaker 252 and the primary transformer 120 are equal.
In the implementation process, in the morning, when the junction box dc voltage signal processing unit detects that the junction box dc voltage is greater than the inverter start voltage threshold preset by the turn-off controller 251, the turn-off controller 251 firstly controls the third circuit breaker 254 to be closed, then controls the inverter start-stop switch to be started, the turn-off controller 251 controls the second circuit breaker 253 to be closed, and when the phase, the phase sequence, the amplitude and the like of the ac voltage between the secondary transformer 110 and the first circuit breaker 252, the phase sequence and the amplitude and the like between the first circuit breaker 252 and the primary transformer 120 are equal, the turn-off controller 251 controls the first circuit breaker 252 to be connected in grid.
When the dc voltage of the combiner box is detected by the combiner dc voltage signal processing unit to be smaller than the inverter running voltage threshold preset by the switching controller 251 in the evening, and after the state duration exceeds the preset limit time, the switching controller 251 controls the third circuit breaker 254 to be switched off, and the switching controller 251 controls the inverter 130 to switch on and off, and when the voltage signals detected by the inverter ac voltage signal processing unit and the primary voltage transformation high voltage ac voltage signal processing unit are inconsistent, the switching controller 251 controls the second circuit breaker 253 to switch off, and at the moment, the ac voltage phase, the phase sequence, the amplitude and the like between the secondary transformer 110 and the first circuit breaker 252 and between the first circuit breaker 252 and the primary transformer 120 are also different, and the switching controller 251 controls the first circuit breaker 252 to switch off, so as to realize off-grid.
When the photovoltaic module 150 generates electricity abnormally, the converging direct current voltage signal processing unit detects that the direct current voltage of the converging box is smaller than the inverter running voltage threshold preset by the switching-off controller 251, and after the state duration exceeds the preset limiting time, the switching-off controller 251 controls the on-off switch of the inverter 130 to be closed, and at the moment, the local photovoltaic module 150 is off-grid.
If the off-grid voltage is according to the specific design condition of the photovoltaic power station, the minimum voltage of the grid connection of the inverter can be set to 96V, 48V and the like, and the off-grid threshold is 42V and 2 hours.
Therefore, off-grid of the photovoltaic system and the inverter in cloudy days, abnormal power generation or at night is realized, and automatic grid connection of the photovoltaic system in daytime is realized.
Further, on the basis of the above embodiment, the collector line ac voltage signal processing unit includes a first voltage sensor 211 and a first a/D conversion module 212, and a first digital signal processing module 213, where the first voltage sensor 211 is used for detecting an ac voltage between the secondary transformer 110 and the first circuit breaker 252, the first a/D conversion module 212 is electrically connected to the first voltage sensor 211 and is used for converting the collector line ac voltage signal into a digital signal, and the first digital signal processing module 213 is electrically connected to the first a/D conversion module 212 and is used for processing the collector line ac voltage signal digital signal.
In this embodiment, the first voltage sensor 211 detects an ac voltage signal between the secondary transformer 110 and the first circuit breaker 252, and converts the analog voltage signal detected by the first voltage sensor 211 into a digital voltage signal through the first a/D conversion module 212, and modulates the digital voltage signal through the first digital signal processing module 213, and the first digital signal processing module 213 modulates the voltage signal, and then sends the modulated voltage signal to the switching controller 251, demodulates the voltage signal processed by the first digital signal processing module 213, and stores the ac voltage signal modulation data of the collecting line.
Similarly, the primary transformer high-voltage ac voltage signal processing unit includes a second voltage sensor 221, a second a/D conversion module 222, and a second digital signal processing module 223, where the second voltage sensor 221 is used for detecting an ac voltage signal between the primary transformer 120 and the first circuit breaker 252, the second a/D conversion module 222 is electrically connected with the second voltage sensor 221 and is used for converting the primary transformer high-voltage ac voltage signal into a digital signal, and the second digital signal processing module 223 is electrically connected with the second a/D conversion module 222 and is used for processing the digital signal. The inverter ac voltage signal processing unit includes a third voltage sensor 231, a third a/D conversion module 232, and a third digital signal processing module 233, where the third voltage sensor 231 is used for detecting an ac voltage signal between the primary transformer 120 and the inverter 130, the third a/D conversion module 232 is electrically connected with the third voltage sensor 231 and is used for converting the inverter ac voltage signal into a digital signal, and the third digital signal processing module 233 is electrically connected with the third a/D conversion module 232 and is used for processing the digital signal. The bus dc voltage signal processing unit includes a fourth voltage sensor 241, a fourth a/D conversion module 242, and a fourth digital signal processing module 243, where the fourth voltage sensor 241 is used for detecting a dc voltage signal between the bus box 140 and the inverter 130, the fourth a/D conversion module 242 is electrically connected to the fourth voltage sensor 241 and is used for converting the bus dc voltage signal into a digital signal, and the fourth digital signal processing module 243 is electrically connected to the fourth a/D conversion module 242 and is used for processing the digital signal.
The processing mode of the primary voltage transformation high-voltage alternating-current voltage signal processing unit, the inversion alternating-current voltage signal processing unit and the converging direct-current voltage signal processing unit for voltage signals is the same as the processing mode of the collecting line alternating-current voltage signal processing unit for analog voltage signals, and the only difference is that the converging direct-current voltage signal processing unit is a direct-current signal, and no description is given here.
Based on the above embodiments, the first voltage sensor 211, the second voltage sensor 221, the third voltage sensor 231, and the fourth voltage sensor 241 are one of a voltage transformer or a hall voltage sensor, and the fourth voltage sensor 241 is used for detecting a dc voltage signal.
Further, the first digital signal processing module 213, the second digital signal processing module 223, the third digital signal processing module 233, the fourth digital signal processing module 243, and the first circuit breaker 252 are respectively electrically connected to the switch-off controller 251, and the first circuit breaker 252 demodulates the voltage signals modulated by the first digital signal processing module 213, the second digital signal processing module 223, the third digital signal processing module 233, and the fourth digital signal processing module 243, calculates and compares the ac voltage signal of the collecting line, the ac voltage signal of the primary transformer, the ac voltage signal of the inverter, and the dc voltage signal of the bus, and controls the switch-off of the first circuit breaker 252 according to the comparison calculation result, thereby realizing automatic switch-off of the grid-connected photovoltaic power station inverter.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present utility model.
Claims (7)
1. An off-grid and grid-connected automatic switching device of a photovoltaic power station inverter, which is characterized by comprising: a first circuit breaker (252), a second circuit breaker (253), a third circuit breaker (254), a collector line alternating current voltage signal processing unit, a primary voltage transformation high voltage alternating current voltage signal processing unit, an inversion alternating current voltage signal processing unit, a confluence direct current voltage signal processing unit and an opening controller (251);
the first circuit breaker (252) is arranged between the primary transformer (120) and the secondary transformer (110); the second circuit breaker (253) is arranged between the primary transformer (120) and the inverter (130); the third circuit breaker (254) is arranged between the inverter (130) and the junction box (140);
the collector line alternating current voltage signal processing unit is used for detecting and processing alternating current voltage signals between the secondary transformer (110) and the first circuit breaker (252);
the primary transformation high-voltage alternating-current voltage signal processing unit is used for detecting and processing alternating-current voltage signals between the first circuit breaker (252) and the primary transformer (120);
the inversion alternating voltage signal processing unit is used for detecting and processing alternating voltage signals between the primary transformer (120) and the inverter (130);
the converging direct-current voltage signal processing unit is used for detecting and processing alternating-current voltage signals between the inverter (130) and the converging box (140);
the first circuit breaker (252), the second circuit breaker (253), the third circuit breaker (254), the collector line alternating current voltage signal processing unit, the primary transformation high-voltage alternating current voltage signal processing unit, the inversion alternating current voltage signal processing unit, the confluence direct current voltage signal processing unit and the start-stop switch of the inverter (130) are electrically connected with the start-stop controller (251).
2. The grid-connected automatic switching device of the photovoltaic power station inverter according to claim 1, wherein the collector line ac voltage signal processing unit comprises a first voltage sensor (211), a first a/D conversion module (212), and a first digital signal processing module (213), the first voltage sensor (211) is used for detecting an ac voltage between the secondary transformer (110) and the first circuit breaker (252), the first a/D conversion module (212) is electrically connected with the first voltage sensor (211) and is used for converting the collector line ac voltage signal into a digital signal, and the first digital signal processing module (213) is electrically connected with the first a/D conversion module (212) and is used for processing the collector line ac voltage signal digital signal.
3. The grid-connected automatic switching device of the photovoltaic power station inverter according to claim 2, wherein the primary transforming high-voltage alternating-current voltage signal processing unit comprises a second voltage sensor (221) and a second a/D conversion module (222), and a second digital signal processing module (223), the second voltage sensor (221) is used for detecting an alternating-current voltage signal between the primary transformer (120) and the first circuit breaker (252), the second a/D conversion module (222) is electrically connected with the second voltage sensor (221) and is used for converting the primary transforming high-voltage alternating-current voltage signal into a digital signal, and the second digital signal processing module (223) is electrically connected with the second a/D conversion module (222) and is used for processing the digital signal.
4. The grid-connected automatic switching device of the photovoltaic power station inverter according to claim 3, wherein the inverter alternating voltage signal processing unit comprises a third voltage sensor (231), a third a/D conversion module (232), and a third digital signal processing module (233), wherein the third voltage sensor (231) is used for detecting an alternating voltage signal between the primary transformer (120) and the inverter (130), the third a/D conversion module (232) is electrically connected with the third voltage sensor (231) and is used for converting the inverter alternating voltage signal into a digital signal, and the third digital signal processing module (233) is electrically connected with the third a/D conversion module (232) and is used for processing the digital signal.
5. The grid-connected automatic switching device for off-grid connection of the photovoltaic power station inverter according to claim 4, wherein the converging direct current voltage signal processing unit comprises a fourth voltage sensor (241), a fourth a/D conversion module (242) and a fourth digital signal processing module (243), the fourth voltage sensor (241) is used for detecting a direct current voltage signal between the converging box (140) and the inverter (130), the fourth a/D conversion module (242) is electrically connected with the fourth voltage sensor (241) and is used for converting the converging direct current voltage signal into a digital signal, and the fourth digital signal processing module (243) is electrically connected with the fourth a/D conversion module (242) and is used for processing the digital signal.
6. The photovoltaic power plant inverter off-grid automatic switching device according to claim 5, wherein the first voltage sensor (211), the second voltage sensor (221), the third voltage sensor (231) and the fourth voltage sensor (241) are one of a voltage transformer or a hall voltage sensor.
7. The grid-connected automatic switching device for off-grid and on-grid of a photovoltaic power plant inverter according to claim 5, wherein the first digital signal processing module (213), the second digital signal processing module (223), the third digital signal processing module (233), the fourth digital signal processing module (243), the first circuit breaker (252), and the inverter (130) start-stop switch are electrically connected with the switching controller (251).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320927245.3U CN219937959U (en) | 2023-04-23 | 2023-04-23 | Photovoltaic power plant dc-to-ac converter is from net automatic switching device that is incorporated into power networks |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320927245.3U CN219937959U (en) | 2023-04-23 | 2023-04-23 | Photovoltaic power plant dc-to-ac converter is from net automatic switching device that is incorporated into power networks |
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| CN219937959U true CN219937959U (en) | 2023-10-31 |
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