CN214124843U - Device for avoiding reduction of photovoltaic grid-connected power factor - Google Patents
Device for avoiding reduction of photovoltaic grid-connected power factor Download PDFInfo
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- CN214124843U CN214124843U CN202120269520.8U CN202120269520U CN214124843U CN 214124843 U CN214124843 U CN 214124843U CN 202120269520 U CN202120269520 U CN 202120269520U CN 214124843 U CN214124843 U CN 214124843U
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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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The application discloses a device for avoiding photovoltaic grid-connected power factor to reduce, including the data acquisition ammeter that is used for acquireing the actual power factor of measurement gate table and the reactive power output data of reactive power compensation part, still including connecting the data acquisition control unit between data acquisition ammeter and photovoltaic inverter, data acquisition control unit is used for comparing actual power factor and power factor standard value, and controls photovoltaic inverter to send additional reactive power in order to compensate when actual power factor is less than power factor standard value and reactive power output data reaches the maximum value. The device for avoiding reduction of the photovoltaic grid-connected power factor can avoid the problem of reduction of the photovoltaic grid-connected power factor on the basis of not increasing cost and not losing photovoltaic power generation capacity.
Description
Technical Field
The utility model relates to a photovoltaic equipment technical field, more specifically say, relate to a device for avoiding photovoltaic grid-connected power factor to reduce.
Background
The photovoltaic power generation technology is developed to the present, the technology is mature day by day, along with the rapid increase of installed capacity, the compatibility problem of photovoltaic grid-connected power generation and the original power grid is revealed day by day, especially the compatibility problem is easy to occur in a distributed photovoltaic grid-connected project when the accessed photovoltaic capacity is large, and the common problem is that after photovoltaic equipment is put into use, the power factor of the outlet of the original power grid is reduced to be below 0.9, so that adverse effects are caused.
In the prior art, a reactive power compensation device with a corresponding size is configured on a project with a voltage class of 10kV or more in a photovoltaic power generation project design stage to solve the problem that a power factor of an original power grid end is lowered after photovoltaic grid connection, however, most of 0.4kV low-voltage grid connection projects are not provided with reactive power compensation devices, namely the problem that the power factor is lowered easily occurs on the project, the problem not only causes certain economic loss for enterprises, but also brings certain power supply pressure for the power grid, two solutions in the current stage are provided, one is to add a set of low-voltage reactive power compensation device, the other is to adjust an inverter to be in a given reactive power mode to enable the inverter to send out a quantitative reactive power to supplement the power grid side, the above two ways can solve the problem, but for a photovoltaic supplier, the first way needs to increase the cost input, the second mode loses the photovoltaic power generation capacity and has poor economy.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem, the utility model provides a device for avoiding photovoltaic grid-connected power factor to reduce can avoid the appearance of photovoltaic grid-connected power factor reduction problem on the basis that does not increase cost and does not lose photovoltaic generated energy.
The utility model provides a pair of a device for avoiding photovoltaic grid-connected power factor to reduce is applied to the electric wire netting, the electric wire netting is including the user side low-voltage bus who is connected with reactive compensation part, user power consumption load, measurement gate table and photovoltaic inverter, the opposite side of measurement gate table is connected to electric wire netting side high-voltage bus through the transformer, the photovoltaic inverter opposite side is connected to photovoltaic cell subassembly, a device for avoiding photovoltaic grid-connected power factor to reduce is including being used for acquireing the actual power factor of measurement gate table with the data acquisition ammeter of reactive power compensation part's reactive power output data, still including connect in data acquisition ammeter with data acquisition control part between the photovoltaic inverter, data acquisition control part is used for comparing actual power factor and power factor standard value, and works as actual power factor is less than the power factor standard value just the reactive power output data reaches maximum value time control part And making the photovoltaic inverter to emit additional reactive power for compensation.
Preferably, in the above apparatus for avoiding reduction of the photovoltaic grid-connected power factor, the reactive compensation component is connected to a reactive controller, and the data collection electric meter obtains the reactive power output data through the reactive controller.
Preferably, in the above apparatus for preventing a reduction in a power factor of a photovoltaic grid connection, the data acquisition control unit is connected to the data acquisition electric meter through a 485 communication line.
Preferably, in the above apparatus for preventing a reduction in a grid-connected photovoltaic power factor, the data acquisition control unit is connected to the photovoltaic inverter via a 485 communication line.
Preferably, in the above apparatus for avoiding reduction of the grid-connected photovoltaic power factor, the range of the power factor standard value is not less than 0.9.
Preferably, in the above apparatus for avoiding reduction of the photovoltaic grid-connected power factor, the metering gateway meter includes a sampling transformer, and the data acquisition electric meter is connected to the sampling transformer to obtain the actual power factor.
It can be seen from the above technical solution that, the device for avoiding the reduction of the grid-connected PV power factor provided by the present invention comprises a data acquisition electric meter for acquiring the actual power factor of the metering gateway meter and the reactive power data of the reactive power compensation component, and further comprises a data acquisition control component connected between the data acquisition electric meter and the PV inverter, wherein the data acquisition control component is used for comparing the actual power factor with the power factor standard value, and controlling the PV inverter to send additional reactive power for compensation when the actual power factor is smaller than the power factor standard value and the reactive power data reaches the maximum value, so that only when the power factor at the metering point of the user gateway is smaller than the value required by the power grid check, and the reactive power compensation device of the user has reached the maximum compensation stage, the photovoltaic inverter is used for generating additional reactive power compensation, so that the automation of the reactive power compensation of the photovoltaic inverter is realized, and the problem of compensating the reactive power by photovoltaic power generation is reduced to the maximum extent, so that the problem of reducing the power factor of the photovoltaic grid-connected grid is avoided on the basis of not increasing the cost and not losing the photovoltaic power generation capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of an embodiment of the present invention, which provides an apparatus for avoiding a reduction in a photovoltaic grid-connected power factor.
Detailed Description
Because the photovoltaic power generation is greatly influenced by environmental factors, when the irradiation intensity is low, the output of the photovoltaic power generation is small, at the moment, the reactive compensation device of a user can meet the regulation of the power factor, and the photovoltaic inverter is not required to send out reactive compensation. Therefore, the utility model provides a device for avoiding photovoltaic grid-connected power factor to reduce can avoid the appearance of photovoltaic grid-connected power factor reduction problem on the basis that does not increase cost and does not lose photovoltaic generated energy.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
An embodiment of a device for avoiding a reduction in a grid-connected PV power factor provided by the present invention is shown in FIG. 1, FIG. 1 is a schematic diagram of an embodiment of a device for avoiding a reduction in a grid-connected PV power factor provided by the present invention, the device is applied to an electric grid including a user-side low voltage bus 5 connected with a reactive compensation part 1, a user electric load 2, a metering gate meter 3 and a PV inverter 4, the other side of the metering gate meter 3 is connected to a grid-side high voltage bus 7 through a transformer 6, the other side of the PV inverter 4 is connected to a PV cell module 8, the device for avoiding a reduction in a grid-connected PV power factor includes a data collection ammeter 9 for acquiring an actual power factor of the metering gate meter 3 and reactive power data of the reactive compensation part 1, and a data collection control part 10 connected between the data collection ammeter 9 and the PV inverter 4, the data acquisition control unit 10 is configured to compare the actual power factor with the power factor standard value, and control the photovoltaic inverter 4 to generate additional reactive power for compensation when the actual power factor is smaller than the power factor standard value and the reactive power output data reaches the maximum value.
It should be noted that the above-mentioned device can be used for solving the problem that the power factor of the grid end is reduced after the photovoltaic grid connection of the 0.4kV grid-connected photovoltaic power generation project, wherein the photovoltaic inverter converts the direct current generated by the photovoltaic cell through the photovoltaic effect into the alternating current, and the characteristics of the alternating current are consistent with those of the grid end, so as to realize the grid connection of the photovoltaic power generation, which is the key equipment of the photovoltaic power generation, and at the same time, the device can receive the instruction sent by the data acquisition control device and execute the instruction, the data acquisition electric meter mainly acquires the signal of the power factor at the metering gate and the signal of the original reactive controller of the user, the data acquisition control device mainly acquires the data of the data acquisition electric meter and the photovoltaic inverter, and simultaneously, the data acquisition control device can also send the related data instruction to the inverter.
Specifically, the data acquisition control unit may be given a reference value COS Φ1The value is a critical value of a reactive power check point of a dispatching department of a power supply company for a user, and the data acquisition control part acquires data COS phi in the data acquisition electric meter2And reactive power output data Q in the reactive power controller; the data acquisition control part calculates COS phi through an internal algorithm program1And COS phi2If COS phi is different from2Less than COS phi1I.e. measuring the power factor (COS phi) at the gate2) Less than the critical value of the reactive power check point (COS phi) of the dispatching department of the power supply company to the users1) When the output of the reactive compensator (Q) originally configured by the user reaches the maximum value, the data acquisition control part sends a command to the photovoltaic inverter, and the command is COS phi1And COS phi2The difference converted reactive power; the photovoltaic inverter receives the instruction, executes the instruction and sends out corresponding reactive power to compensate the reactive power of the user until COS phi2Greater than or equal to COS phi1Otherwise, the steps are circulated, and therefore the device can automatically realize reactive power control of the photovoltaic inverter.
It can be seen from the above technical solution that in the embodiment of the above device for avoiding the reduction of the power factor of the photovoltaic grid-connected device provided by the present invention, because the present invention includes the data collection meter for acquiring the actual power factor of the metering gate meter and the reactive power data of the reactive power compensation component, and further includes the data collection control component connected between the data collection meter and the photovoltaic inverter, the data collection control component is used for comparing the actual power factor with the power factor standard value, and controls the photovoltaic inverter to send additional reactive power for compensation when the actual power factor is smaller than the power factor standard value and the reactive power data reaches the maximum value, therefore, only when the power factor at the metering point of the user gate is smaller than the value required for checking the power grid, and the reactive power compensation device of the user has reached the maximum compensation stage, the photovoltaic inverter is used to send the compensation of additional reactive power, therefore, the automation of the reactive compensation of the photovoltaic inverter is realized, and the problem of compensating the reactive power by photovoltaic power generation is reduced to the maximum extent, so that the problem of reducing the power factor of the photovoltaic grid connection can be avoided on the basis of not increasing the cost and not losing the photovoltaic power generation amount.
In one embodiment of the above device for avoiding the reduction of the power factor of the photovoltaic grid connection, the reactive compensation component 1 is connected with a reactive controller 11, and the data collection meter 9 obtains the reactive power output data through the reactive controller 11.
In another embodiment of the above device for preventing the power factor of the grid-connected photovoltaic from decreasing, the data acquisition control component 10 and the data acquisition electric meter 9 may be connected by a 485 communication line, and the data acquisition control component may also be connected by a 485 communication line with the photovoltaic inverter. The 485 communication line has the advantages of low cost, convenient connection and installation and wide application range, and can be replaced by optical fibers or network cables without limitation.
In a specific embodiment of the above apparatus for avoiding reduction of the power factor of the photovoltaic grid connection, the range of the power factor standard value is not less than 0.9, and of course, the standard value may also be adjusted according to actual needs, which is not limited herein, and the metering gate table may include a sampling transformer, and the data collection electric meter is connected to the sampling transformer to obtain the actual power factor.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The utility model provides a device for avoiding photovoltaic grid-connected power factor to reduce, is applied to the electric wire netting, the electric wire netting is including the user side low-voltage bus who is connected with reactive compensation part, user power consumption load, measurement gateway table and photovoltaic inverter, the opposite side of measurement gateway table is connected to electric wire netting side high-voltage bus through the transformer, photovoltaic inverter opposite side is connected to photovoltaic cell subassembly, a serial communication port, a device for avoiding photovoltaic grid-connected power factor to reduce is including being used for acquireing the actual power factor of measurement gateway table with the data acquisition ammeter of reactive power output data of reactive compensation part, still including connect in data acquisition ammeter with data acquisition control unit between the photovoltaic inverter, data acquisition control unit is used for comparing actual power factor and power factor standard value, and when actual power factor is less than the power factor standard value and the reactive power output data reaches the maximum value time control unit And making the photovoltaic inverter to emit additional reactive power for compensation.
2. The apparatus according to claim 1, wherein a reactive controller is connected to the reactive compensation component, and the data collection meter obtains the reactive power output data through the reactive controller.
3. The device for avoiding the reduction of the grid-connected PV power factor according to claim 1, wherein the data acquisition control unit is connected to the data acquisition electric meter through a 485 communication line.
4. The device for avoiding the reduction of the grid-connected PV power factor according to claim 1, wherein the data acquisition control unit is connected to the PV inverter through a 485 communication line.
5. The device for avoiding the reduction of the grid-connected PV power factor according to claim 1, characterized in that the range of the standard value of the power factor is not lower than 0.9.
6. The device for avoiding reduction of grid-connected PV power factor according to claim 1, wherein the metering gateway meter includes a sampling transformer, and the data collecting meter is connected to the sampling transformer to obtain the actual power factor.
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| CN202120269520.8U CN214124843U (en) | 2021-01-29 | 2021-01-29 | Device for avoiding reduction of photovoltaic grid-connected power factor |
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| CN202120269520.8U CN214124843U (en) | 2021-01-29 | 2021-01-29 | Device for avoiding reduction of photovoltaic grid-connected power factor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113965063A (en) * | 2021-11-04 | 2022-01-21 | 福建奥德孚能源服务有限公司 | A method for improving power factor of users connected with distributed photovoltaics |
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2021
- 2021-01-29 CN CN202120269520.8U patent/CN214124843U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113965063A (en) * | 2021-11-04 | 2022-01-21 | 福建奥德孚能源服务有限公司 | A method for improving power factor of users connected with distributed photovoltaics |
| CN113965063B (en) * | 2021-11-04 | 2025-01-07 | 福建奥德孚能源服务有限公司 | A method for improving power factor of users connected to distributed photovoltaics |
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Effective date of registration: 20240423 Address after: Room 108, 1st Floor, Building 1, No. 11 Liangzhan Road, Renhe Street, Yuhang District, Hangzhou City, Zhejiang Province, 311107 Patentee after: Zhejiang Hangtai Shuzhi Energy development Co.,Ltd. Country or region after: China Address before: No.1335 Bin'an Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG ASTRONERGY NEW ENERGY DEVELOPMENT Co.,Ltd. Country or region before: China |
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