CN112821754A - Photovoltaic power generation system and control method thereof - Google Patents
Photovoltaic power generation system and control method thereof Download PDFInfo
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- CN112821754A CN112821754A CN202011642388.7A CN202011642388A CN112821754A CN 112821754 A CN112821754 A CN 112821754A CN 202011642388 A CN202011642388 A CN 202011642388A CN 112821754 A CN112821754 A CN 112821754A
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- Prior art keywords
- 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 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. 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 fig. 1 and mainly comprises an inductor L1, a switching tube Q1, a diode D1 and a capacitor C2. Along with the increase of unit current, the duty ratio will grow, can lead to the loss increase of switch tube, and when the heat dissipation condition was fixed unchangeable, the heat distributes not go out, and photovoltaic power generation system's reliability will reduce thereupon, may even take place to damage. If the current is limited, the power generation amount of a user is lost, and the power generation income of the user is reduced.
Disclosure of Invention
In view of the above, 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 benefit 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 objectives of the present application will be further explained 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 is to 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, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element 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" and "second" 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 the present example, the dc-dc converter includes a Boost voltage 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 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 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, the duty ratio of the switching tube is shown as a curve corresponding to the switching frequency<Dmax1While maintaining the switching frequency of the switching tube at Fmax(ii) a When the duty ratio of the switching tube>Dmax1And is<Dmax2When the switching frequency of the switching tube is controlled to be linearly reduced, namely the switching frequency is reduced toFmin(ii) a When the duty ratio of the switching tube>Dmax2And is<Dmax3While maintaining the switching frequency of the switching tube at Fmin。
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:
step S11, determining the duty ratio of the switching tube;
and step 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 greater than a preset value, maintaining the switching frequency of the switching tube unchanged.
In an 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 are not intended to limit the scope of the claims of the application accordingly. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present application are intended to be within the scope of the claims of the present application.
Claims (9)
1. A photovoltaic power generation system includes 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; wherein 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.
2. The photovoltaic power generation system of claim 1, wherein 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.
3. The photovoltaic power generation system of claim 1, wherein 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.
4. The photovoltaic power generation system of claim 1, wherein the switching frequency of the switching tube is controlled to decrease linearly or to decrease non-linearly.
5. The photovoltaic power generation system of claim 1, wherein the dc-dc converter comprises a Boost circuit.
6. A control method of a photovoltaic power generation system, the photovoltaic power generation system comprising a DC-DC converter, an inverter, and a controller for controlling the DC-DC converter and the inverter, the DC-DC converter comprising at least one switching tube; characterized in that the method comprises:
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.
7. The control method of a photovoltaic power generation system according to claim 6, characterized by further comprising:
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.
8. The control method of a photovoltaic power generation system according to claim 6, characterized by further comprising:
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.
9. The control method of the photovoltaic power generation system according to claim 6, wherein the switching frequency of the switching tube is controlled to be linearly decreased or non-linearly decreased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011642388.7A CN112821754B (en) | 2020-12-31 | 2020-12-31 | Photovoltaic power generation system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011642388.7A CN112821754B (en) | 2020-12-31 | 2020-12-31 | Photovoltaic power generation system and control method thereof |
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| Publication Number | Publication Date |
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| CN112821754A true CN112821754A (en) | 2021-05-18 |
| CN112821754B CN112821754B (en) | 2023-01-06 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270004A (en) * | 2014-10-27 | 2015-01-07 | 阳光电源股份有限公司 | Photovoltaic inverter control method and system |
| 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 |
| CN108372789A (en) * | 2017-01-31 | 2018-08-07 | 福特全球技术公司 | The fault detect of bypass diode in variable voltage converting system |
| CN109818495A (en) * | 2019-03-14 | 2019-05-28 | 阳光电源股份有限公司 | Group string inverter and its boost chopper control method |
-
2020
- 2020-12-31 CN CN202011642388.7A patent/CN112821754B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270004A (en) * | 2014-10-27 | 2015-01-07 | 阳光电源股份有限公司 | Photovoltaic inverter control method and system |
| 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 |
| CN108372789A (en) * | 2017-01-31 | 2018-08-07 | 福特全球技术公司 | The fault detect of bypass diode in variable voltage converting system |
| CN109818495A (en) * | 2019-03-14 | 2019-05-28 | 阳光电源股份有限公司 | Group string inverter and its boost chopper control method |
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| Publication number | Publication date |
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| CN112821754B (en) | 2023-01-06 |
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