CN118367615A - Photovoltaic power generation grid-connected control method and system - Google Patents
Photovoltaic power generation grid-connected control method and system Download PDFInfo
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- CN118367615A CN118367615A CN202410336169.8A CN202410336169A CN118367615A CN 118367615 A CN118367615 A CN 118367615A CN 202410336169 A CN202410336169 A CN 202410336169A CN 118367615 A CN118367615 A CN 118367615A
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- power generation
- photovoltaic
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- 238000010248 power generation Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 6
- 238000007621 cluster analysis Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- 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
- H02J13/00002—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 monitoring
-
- 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
- H02J13/00004—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 the power network being locally controlled
-
- 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
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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)
- Control Of Electrical Variables (AREA)
Abstract
The application provides a photovoltaic power generation grid-connected control method and a system, which relate to the technical field of new energy power generation and comprise the following steps: detecting voltage data and current data of the photovoltaic array to obtain a voltage and current data set; carrying out parameter analysis on the photovoltaic power generation requirement according to the obtained data set to obtain photovoltaic power generation requirement information; calculating the actual working power of the photovoltaic system, and judging whether the actual working power of the photovoltaic system meets the photovoltaic power generation requirement; the controller adjusts the working power in real time, realizes no static difference control on grid connection, and ensures the voltage quality fed into the power grid; the photovoltaic power generation grid-connected system comprises a photovoltaic array, a photovoltaic power generation device, a voltage detection device, a current detection device and a controller; according to the application, the photovoltaic power generation capacity is matched with the power grid requirement, so that the influence of the photovoltaic power generation grid connection on the running state of the power grid is reduced, and a powerful guarantee is provided for the safe and stable running of the power grid.
Description
Technical Field
The invention relates to the technical field of new energy power generation, in particular to a photovoltaic power generation grid-connected control method and system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The basic principle of photovoltaic power generation is to convert solar energy into electric energy by utilizing the principle of energy conversion. The solar energy is used for photovoltaic power generation, so that effective energy utilization is provided for human social activities, the photovoltaic power generation and weather are greatly influenced, the characteristics of volatility, intermittence, uncontrollability and the like are achieved, and the large-scale photovoltaic grid connection brings great challenges to the safe and stable operation of a power system.
In the prior art, the grid-connected regulation accuracy aiming at the photovoltaic power generation is not high, and the technical problem of poor grid-connected operation control effect of the photovoltaic power generation is caused.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a photovoltaic power generation grid-connected control method and system, which are used for matching the power grid requirement through the photovoltaic power generation capacity, reducing the influence of the photovoltaic power generation grid-connected on the running state of the power grid and providing powerful guarantee for the safe and stable running of the power grid; the accuracy of photovoltaic power generation grid connection is improved, and the stability of photovoltaic power generation grid connection is improved.
To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
a photovoltaic power generation grid-connected control method is applied to a photovoltaic power generation grid-connected system and comprises the following steps:
Detecting voltage data and current data of the photovoltaic array to obtain a voltage and current data set;
carrying out parameter analysis on the photovoltaic power generation requirement according to the obtained data set to obtain photovoltaic power generation requirement information;
Calculating the actual working power of the photovoltaic system, and judging whether the actual working power of the photovoltaic system meets the photovoltaic power generation requirement;
The controller adjusts the working power in real time, realizes no static difference control on grid connection, and ensures the voltage quality fed into the power grid.
The embodiment of the invention also provides a photovoltaic power generation grid-connected system, which comprises: the photovoltaic power generation device comprises a photovoltaic array, a photovoltaic power generation device, a voltage detection device, a current detection device and a controller;
The photovoltaic power generation device includes: the DC/DC converter, the inverter and the direct current bus;
the output end of the inverter is connected with a power grid; the input end of the DC/DC converter is connected with the photovoltaic array, the DC/DC converter and the inverter adopt a cascade structure so as to achieve the purpose of matching the voltages of front and rear stages of circuits, and the output end of the DC/DC converter is connected with the input end of the inverter through a direct current bus;
The voltage detection device is used for detecting the output voltage of the photovoltaic array and sending the output voltage to the controller; the current detection device is used for detecting the current of the photovoltaic array and sending the output voltage and the current to the controller;
The controller mainly comprises an MPPT controller, a LADRC controller and a grid-connected current controller, and is used for generating corresponding control signals based on the power photovoltaic power generation capacity matching grid requirements according to collected voltage and current data.
Compared with the prior art, the invention has the following advantages:
According to the photovoltaic power generation grid-connected control method, the photovoltaic power generation capacity is matched with the power grid requirement, so that the influence of the photovoltaic power generation grid connection on the running state of the power grid is reduced, powerful guarantee is provided for the safe and stable running of the power grid, meanwhile, the possible misjudgment problem is eliminated as far as possible, and the influence of external interference on the output characteristic is restrained.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a flowchart of an embodiment of a photovoltaic power generation grid-connected control method provided by the invention;
Fig. 2 is a schematic diagram of an embodiment of a photovoltaic power generation grid-connected control system provided by the invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention.
Examples
The embodiment discloses a photovoltaic power generation grid-connected regulation control method, which comprises the following steps as shown in fig. 1:
S101: and detecting voltage data and current data of the photovoltaic array to obtain a voltage and current data set.
The detected voltage data comprise output voltage of a photovoltaic array terminal, direct current bus voltage and grid-connected voltage, wherein the grid-connected voltage is alternating current voltage, and the rest is direct current voltage;
The detected current data comprise photovoltaic array output current and grid-connected output current, wherein the photovoltaic array output current is direct current, the grid-connected output current is alternating current, and the photovoltaic array output current is converted into output voltage through a Hall sensor.
S102: carrying out parameter analysis on the photovoltaic power generation requirement according to the obtained data set to obtain photovoltaic power generation requirement information;
Further, step S102 of the present application further includes:
Step S201: performing cluster analysis on the plurality of historical power supply information according to the required power supply information to obtain a power supply characteristic data set;
Step S202: calculating a power supply duty ratio based on the power supply characteristic data set to obtain the photovoltaic duty ratio prediction result;
step S203: and obtaining the target photovoltaic power generation requirement information based on the power supply task information and the photovoltaic duty ratio prediction result.
Further, a photovoltaic duty ratio prediction result is extracted from the obtained power supply characteristic data set, wherein the photovoltaic duty ratio prediction result comprises a photovoltaic power generation duty ratio prediction coefficient. And multiplying power supply information and photovoltaic duty ratio prediction results to obtain target photovoltaic power generation demand information, so that effective information processing is achieved, accurate target photovoltaic demand information is obtained, and the technical effects of accuracy and adaptability of photovoltaic power generation grid-connected control are improved.
S103: calculating the actual working power of the photovoltaic system, and judging whether the actual working power of the photovoltaic system meets the photovoltaic power generation requirement;
Further, step S103 of the present application further includes:
Step S301: collecting the photovoltaic power generation demand information and the collected voltage and current data set by using a controller, adding the photovoltaic power generation demand information and the collected voltage and current data set into a database, and analyzing the database to obtain photovoltaic power generation characteristic data information;
step S302: calculating the actual working power of the photovoltaic system based on the photovoltaic power generation characteristic data information;
step S303: judging whether the actual working power of the photovoltaic system meets the photovoltaic power generation requirement or not;
S104: the controller adjusts the working power in real time, realizes no static difference control on grid connection, and ensures the voltage quality fed into the power grid.
Further, step S104 of the present application further includes:
step S401: determining a motor power generation planning curve according to the predicted photovoltaic power generation power and the power grid information;
step S402: and the controller controls grid-connected power generation power through a control module according to the photovoltaic power generation planning curve.
Specifically, if the voltage and the power change directions are the same, the voltage should be increased; if the direction of the voltage and the direction of the power change are opposite, the voltage should be reduced, and whether the direction of the change of the voltage and the direction of the change of the power are consistent can be judged directly by judging the positive and negative of the product of the voltage and the power, so that the control algorithm is simpler and more convenient, and the purpose of finally realizing no static difference control on grid connection and guaranteeing the quality of the voltage fed into a power grid is achieved.
Based on the photovoltaic power generation grid-connected control method provided by the embodiment, the invention also provides a photovoltaic power generation grid-connected system, and the working principle of the photovoltaic power generation grid-connected system is described in detail below with reference to the accompanying drawings.
System embodiment:
Referring to fig. 2, an embodiment of a photovoltaic power generation grid-connected system provided by the invention is shown.
The photovoltaic power generation grid-connected system provided in this embodiment includes: a photovoltaic array, a photovoltaic power generation device, a voltage detection device (not shown), a current detection device (not shown), and a controller;
The photovoltaic power generation device includes: the DC/DC converter, the inverter and the direct current bus;
the output end of the inverter is connected with a power grid; the input end of the DC/DC converter is connected with the photovoltaic array, the DC/DC converter and the inverter adopt a cascade structure so as to achieve the purpose of matching the voltages of front and rear stages of circuits, and the output end of the DC/DC converter is connected with the input end of the inverter through a direct current bus;
The voltage detection device is used for detecting the output voltage of the photovoltaic array and sending the output voltage to the controller; the current detection device is used for detecting the current of the photovoltaic array and sending the output voltage and the current to the controller;
The controller mainly comprises an MPPT controller, a LADRC controller and a grid-connected current controller, and is used for generating corresponding control signals based on the power photovoltaic power generation capacity matching grid requirements according to collected voltage and current data.
Preferably, the voltage of the direct current bus can be used as a voltage feedback signal to form a voltage closed loop with the LADRC module to compensate disturbance of the photovoltaic system and stabilize the voltage of the direct current bus.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The photovoltaic power generation grid-connected control method is characterized by being applied to a photovoltaic grid-connected system and comprising the following steps of:
step one, detecting voltage data and current data of a photovoltaic array to obtain a voltage and current data set;
step two, carrying out parameter analysis on the photovoltaic power generation requirement according to the obtained data set to obtain photovoltaic power generation requirement information;
step three, calculating the actual working power of the photovoltaic system, and judging whether the actual working power of the photovoltaic system meets the photovoltaic power generation requirement;
And fourthly, the controller adjusts the working power in real time, realizes no static difference control on grid connection, and ensures the voltage quality fed into the power grid.
2. The photovoltaic power generation grid-connected control method according to claim 1, wherein the detected voltage data comprises a photovoltaic array terminal output voltage, a direct current bus voltage and a grid-connected voltage, wherein the grid-connected voltage is an alternating current voltage, and the rest is a direct current voltage.
3. The grid-connected control method for photovoltaic power generation according to claim 1, wherein the detected current data includes a photovoltaic array output current and a grid-connected output current, wherein the photovoltaic array output current is a direct current, the grid-connected output current is an alternating current, and the alternating current is converted into an output voltage by a hall sensor.
4. The photovoltaic power generation grid-connected control method according to claim 1, wherein the step two further comprises:
performing cluster analysis on the plurality of historical power supply information according to the required power supply information to obtain a power supply characteristic data set;
calculating a power supply duty ratio based on the power supply characteristic data set to obtain the photovoltaic duty ratio prediction result;
And obtaining the target photovoltaic power generation requirement information based on the power supply task information and the photovoltaic duty ratio prediction result.
5. The photovoltaic power generation grid-connected control method according to claim 1, wherein the third step further comprises:
collecting the photovoltaic power generation demand information and the collected voltage and current data set by using a controller, adding the photovoltaic power generation demand information and the collected voltage and current data set into a database, and analyzing the database to obtain photovoltaic power generation characteristic data information;
calculating the actual working power of the photovoltaic system based on the photovoltaic power generation characteristic data information;
and judging whether the actual working power of the photovoltaic system meets the photovoltaic power generation requirement.
6. The photovoltaic power generation grid-connected control method according to claim 1, wherein the fourth step further comprises:
determining a motor power generation planning curve according to the predicted photovoltaic power generation power and the power grid information;
and the controller controls grid-connected power generation power through a control module according to the photovoltaic power generation planning curve.
7. The grid-connected photovoltaic power generation control method according to claim 6, wherein in the grid-connected power generation control process, if the change directions of the voltage and the power are the same, the voltage should be increased; if the direction of the voltage and the direction of the power change are opposite, the voltage should be reduced, and whether the direction of the change of the voltage and the direction of the change of the power are consistent can be judged directly by judging the positive and negative of the product of the voltage and the power, so that the control algorithm is simpler and more convenient, and the purpose of finally realizing no static difference control on grid connection and guaranteeing the quality of the voltage fed into a power grid is achieved.
8. A photovoltaic power generation grid-tie system, comprising: the photovoltaic power generation device comprises a photovoltaic array, a photovoltaic power generation device, a voltage detection device, a current detection device and a controller;
The photovoltaic power generation device includes: the DC/DC converter, the inverter and the direct current bus;
the voltage detection device is used for detecting the output voltage of the photovoltaic array and sending the output voltage to the controller;
the current detection device is used for detecting the current of the photovoltaic array and sending the output voltage and the current to the controller;
The controller mainly comprises an MPPT controller, a LADRC controller and a grid-connected current controller, and is used for generating corresponding control signals based on the power photovoltaic power generation capacity matching grid requirements according to collected voltage and current data.
9. The photovoltaic power generation grid-tie system of claim 8, wherein the output of the inverter is connected to a grid; the input end of the DC/DC converter is connected with the photovoltaic array, the DC/DC converter and the inverter adopt a cascade structure so as to achieve the purpose of matching the voltages of front and rear stages of circuits, and the output end of the DC/DC converter is connected with the input end of the inverter through a direct current bus.
10. The photovoltaic power generation grid-tie system of claim 8, wherein the voltage of the dc bus can be used as a voltage feedback signal to form a voltage closed loop with the ladc module to compensate for the disturbance of the photovoltaic system and stabilize the dc bus voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410336169.8A CN118367615A (en) | 2024-03-22 | 2024-03-22 | Photovoltaic power generation grid-connected control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410336169.8A CN118367615A (en) | 2024-03-22 | 2024-03-22 | Photovoltaic power generation grid-connected control method and system |
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| CN118367615A true CN118367615A (en) | 2024-07-19 |
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| CN202410336169.8A Pending CN118367615A (en) | 2024-03-22 | 2024-03-22 | Photovoltaic power generation grid-connected control method and system |
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- 2024-03-22 CN CN202410336169.8A patent/CN118367615A/en active Pending
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