CN112821754B - Photovoltaic power generation system and control method thereof - Google Patents
Photovoltaic power generation system and control method thereof Download PDFInfo
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- CN112821754B CN112821754B CN202011642388.7A CN202011642388A CN112821754B CN 112821754 B CN112821754 B CN 112821754B CN 202011642388 A CN202011642388 A CN 202011642388A CN 112821754 B CN112821754 B CN 112821754B
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- switching tube
- power generation
- generation system
- photovoltaic power
- converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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
- 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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- 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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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application discloses a photovoltaic power generation system and a control method thereof, wherein the photovoltaic power generation system comprises a direct current-direct current converter, an inverter and a controller for controlling the direct current-direct current converter and the inverter, and the direct current-direct current converter comprises at least one switching tube; the controller is configured to: determining the duty ratio of the switching tube; and if the duty ratio of the switching tube is greater than a preset value, controlling the switching frequency of the switching tube to be reduced so as to improve the output current capability of the DC-DC converter. The switching frequency of the switching tube is adjusted according to the duty ratio of the switching tube, the loss of the switching tube is reduced, the reliability of the photovoltaic power generation system is guaranteed, the DC/DC side output current capacity is enhanced, the generated energy of the photovoltaic power generation system and the power generation income of a user are improved, and meanwhile the cost of the photovoltaic power generation system is also reduced.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a photovoltaic power generation system and a control method thereof.
Background
With the development of new energy technology, manufacturers start upgrading and iterating the solar cell panel, and the power specification is gradually increased. Due to terrain limitations or a small number of user-configurable components, to increase power generation, the full-load MPPT voltage needs to be lowered to enhance the output current capability, however this approach will result in a larger duty cycle.
The photovoltaic inverter mainly comprises a BOOST voltage boosting circuit and a DC/AC inverter circuit, wherein the topology of the BOOST voltage boosting circuit is shown in figure 1 and mainly comprises an inductor L1, a switching tube Q1, a diode D1 and a capacitor C2. Along with the increase of the unit current, the duty ratio is increased, the loss of the switching tube is increased, when the heat dissipation condition is fixed and unchanged, the heat is not dissipated, the reliability of the photovoltaic power generation system is reduced, and even the photovoltaic power generation system can be damaged. If the current is limited, the power generation amount of the user is lost, and the power generation income of the user is reduced.
Disclosure of Invention
In view of this, an object of the present application is to provide a photovoltaic power generation system and a control method thereof, so as to solve the problem of how to ensure the reliability of the photovoltaic power generation system without losing the power generation amount.
The technical scheme adopted by the application for solving the technical problems is as follows:
according to an aspect of the present application, there is provided a photovoltaic power generation system including a dc-dc converter, an inverter, and a controller for controlling the dc-dc converter and the inverter, the dc-dc converter including at least one switching tube; the controller is configured to:
determining the duty ratio of the switching tube;
and if the duty ratio of the switching tube is larger than a preset value, controlling the switching frequency of the switching tube to be reduced so as to improve the output current capability of the DC-DC converter.
According to another aspect of the present application, there is provided a control method of a photovoltaic power generation system including a dc-dc converter, an inverter, and a controller for controlling the dc-dc converter and the inverter, the dc-dc converter including at least one switching tube; the method comprises the following steps:
determining the duty ratio of the switching tube;
and if the duty ratio of the switching tube is larger than a preset value, controlling the switching frequency of the switching tube to be reduced so as to improve the output current capability of the DC-DC converter.
According to the photovoltaic power generation system and the control method thereof, the switching frequency of the switching tube is adjusted according to the duty ratio of the switching tube, the loss of the switching tube is reduced, the reliability of the photovoltaic power generation system is ensured, the output current capability of the DC/DC side is enhanced, the generated energy of the photovoltaic power generation system and the power generation income of a user are improved, and meanwhile the cost of the photovoltaic power generation system is also reduced.
Drawings
Fig. 1 is a schematic diagram of a BOOST voltage BOOST circuit provided in an embodiment of the present application;
FIG. 2 is a schematic view of a photovoltaic power generation system provided by an embodiment of the present application;
fig. 3 is a schematic diagram of a control method of a photovoltaic power generation system according to an embodiment of the present application;
fig. 4 is a schematic diagram of a corresponding relationship curve between a duty ratio and a switching frequency provided in the embodiment of the present application.
The implementation, functional features and advantages of the object of the present application will be further explained with reference to the embodiments, and with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
As shown in fig. 2, an embodiment of the present application provides a photovoltaic power generation system, which includes a dc-dc converter, an inverter, and a controller for controlling the dc-dc converter and the inverter, where the dc-dc converter includes at least one switching tube.
As shown in fig. 1, in this example, the dc-dc converter includes a Boost circuit including an inductor L1, a switching tube Q1, a diode D1, and capacitors C1 and C2.
1-2, the controller is configured to:
determining the duty ratio of the switching tube;
and if the duty ratio of the switching tube is greater than a preset value, controlling the switching frequency of the switching tube to be reduced so as to improve the output current capability of the DC-DC converter.
In an embodiment, the controller is further configured to:
and if the duty ratio of the switching tube is not greater than a preset value, maintaining the switching frequency of the switching tube unchanged.
In an embodiment, the controller is further configured to:
and if the switching frequency of the switching tube is reduced to a preset threshold value, maintaining the switching frequency of the switching tube as the preset threshold value.
In an embodiment, the controller is further configured to:
and controlling the switching frequency of the switching tube to be linearly reduced or nonlinearly reduced.
The following is described with reference to fig. 4:
as shown in fig. 4, when the duty ratio of the switching tube is in accordance with the corresponding relationship curve of the duty ratio and the switching frequency<D max1 While maintaining the switching frequency of the switching tube at F max (ii) a When the duty ratio of the switching tube>D max1 And is<D max2 When the switching frequency of the switching tube is controlled to be linearly reduced, namely the switching frequency is reduced to F min (ii) a When the duty ratio of the switching tube>D max2 And is provided with<D max3 While maintaining the switching frequency of the switching tube at F min 。
Example 2
As shown in fig. 3, the embodiment of the present application provides a control method for a photovoltaic power generation system, which can refer to fig. 1 to fig. 2 and the foregoing contents, and is not repeated herein.
The method comprises the following steps:
s11, determining the duty ratio of the switching tube;
and S12, if the duty ratio of the switching tube is larger than a preset value, controlling the switching frequency of the switching tube to be reduced so as to improve the output current capability of the DC-DC converter.
In an embodiment, the method further comprises:
and if the duty ratio of the switching tube is not more than a preset value, maintaining the switching frequency of the switching tube unchanged.
In one embodiment, the method further comprises:
and if the switching frequency of the switching tube is reduced to a preset threshold value, maintaining the switching frequency of the switching tube as the preset threshold value.
In an embodiment, the method further comprises:
and controlling the switching frequency of the switching tube to be linearly reduced or nonlinearly reduced.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and the scope of the claims of the present application is not limited thereby. Any modifications, equivalents, and improvements made by those skilled in the art without departing from the scope and spirit of the present application should be within the scope of the claims of the present application.
Claims (3)
1. A photovoltaic power generation system comprises a DC-DC converter, an inverter and a controller for controlling the DC-DC converter and the inverter, wherein the DC-DC converter comprises at least one switching tube; wherein the controller is configured to:
determining the duty ratio of the switching tube;
if the duty ratio of the switching tube is larger than a preset value, controlling the switching frequency of the switching tube to be linearly reduced or nonlinearly reduced so as to improve the output current capability of the DC-DC converter;
if the duty ratio of the switching tube is not larger than a preset value, maintaining the switching frequency of the switching tube unchanged;
and if the switching frequency of the switching tube is reduced to a preset threshold value, maintaining the switching frequency of the switching tube as the preset threshold value.
2. The photovoltaic power generation system of claim 1, wherein the dc-dc converter comprises a Boost circuit.
3. A control method of a photovoltaic power generation system, the photovoltaic power generation system comprises a DC-DC converter, an inverter, and a controller for controlling the DC-DC converter and the inverter, wherein the DC-DC converter comprises at least one switching tube; characterized in that the method comprises:
determining the duty ratio of the switching tube;
if the duty ratio of the switching tube is larger than a preset value, controlling the switching frequency of the switching tube to be linearly reduced or nonlinearly reduced so as to improve the output current capability of the DC-DC converter;
if the duty ratio of the switching tube is not larger than a preset value, maintaining the switching frequency of the switching tube unchanged;
and if the switching frequency of the switching tube is reduced to a preset threshold value, maintaining the switching frequency of the switching tube as the preset threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011642388.7A CN112821754B (en) | 2020-12-31 | 2020-12-31 | Photovoltaic power generation system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011642388.7A CN112821754B (en) | 2020-12-31 | 2020-12-31 | Photovoltaic power generation system and control method thereof |
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| CN112821754A CN112821754A (en) | 2021-05-18 |
| CN112821754B true CN112821754B (en) | 2023-01-06 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615190A (en) * | 2015-02-15 | 2015-05-13 | 无锡上能新能源有限公司 | Control method of MPPT (maximum power point tracking) optimizer of photovoltaic power generation system |
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| CN104270004B (en) * | 2014-10-27 | 2017-10-17 | 阳光电源股份有限公司 | A kind of photovoltaic DC-to-AC converter control method and system |
| US10272785B2 (en) * | 2017-01-31 | 2019-04-30 | Ford Global Technologies, Llc | Fault detection of a bypass diode in a variable voltage convert system |
| CN109818495B (en) * | 2019-03-14 | 2020-05-22 | 阳光电源股份有限公司 | String inverter and boost chopper circuit control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104615190A (en) * | 2015-02-15 | 2015-05-13 | 无锡上能新能源有限公司 | Control method of MPPT (maximum power point tracking) optimizer of photovoltaic power generation system |
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