CN112366696A - Self-coordinated multi-element power supply system and frequency converter thereof - Google Patents
Self-coordinated multi-element power supply system and frequency converter thereof Download PDFInfo
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- 239000003990 capacitor Substances 0.000 claims description 13
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- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power 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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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
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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)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Inverter Devices (AREA)
Abstract
The application discloses self-coordinated multielement power supply system includes: the system comprises a photovoltaic power supply device, a three-phase power supply device and a frequency converter; the photovoltaic power supply device is used for converting light energy into electric energy to provide direct-current power supply; the three-phase power supply device is used for taking power from a power grid to provide three alternating current power supplies; the frequency converter is used for coordinating the power supply proportion of the photovoltaic power supply device and the three-phase power supply device according to the power supply states of the photovoltaic power supply device and the three-phase power supply device. The self-coordination multi-element power supply system and the frequency converter thereof have the advantages that the self-coordination multi-element power supply system and the frequency converter thereof can coordinate the power supply use proportion according to the power supply input condition so as to ensure stable power supply.
Description
Technical Field
The application relates to a power supply system, in particular to a self-coordinated multi-element power supply system and a frequency converter thereof.
Background
A Variable-frequency Drive (VFD) is a power control device that applies frequency conversion technology and microelectronic technology to control an ac motor by changing the frequency of a working power supply of the motor.
The frequency converter mainly comprises a rectifying unit (alternating current to direct current), a filtering unit, an inverting unit (direct current to alternating current), a braking unit, a driving unit, a detection unit micro-processing unit and the like. The frequency converter adjusts the voltage and frequency of an output power supply by switching on and off an internal IGBT, provides the required power supply voltage according to the actual requirement of the motor, and further achieves the purposes of energy saving and speed regulation. With the continuous improvement of the industrial automation degree, the frequency converter is also widely applied.
In the prior art, a scheme that a frequency converter adopts multiple electric energy sources for power supply exists, but the power supply mode in the schemes cannot be adapted according to actual conditions.
Disclosure of Invention
To address the deficiencies of the prior art, the present application provides a self-coordinated multi-element power supply system comprising: the system comprises a photovoltaic power supply device, a three-phase power supply device and a frequency converter; the photovoltaic power supply device is used for converting light energy into electric energy to provide direct-current power supply; the three-phase power supply device is used for taking power from a power grid to provide three alternating current power supplies; the frequency converter is used for coordinating the power supply proportion of the photovoltaic power supply device and the three-phase power supply device according to the power supply states of the photovoltaic power supply device and the three-phase power supply device.
Further, the frequency converter includes: the voltage detection module is used for detecting the voltage value of a direct current power supply of the photovoltaic power supply device; and when the voltage value of the direct-current power supply detected by the voltage detection module exceeds a first preset voltage threshold value, the frequency converter turns off the input of the three-phase power supply device to the alternating-current power supply of the frequency converter.
Further, when the voltage value of the dc power supply detected by the voltage detection module is lower than a second preset voltage threshold, the converter turns off the input of the photovoltaic power supply device to the dc power supply of the converter.
Further, when the voltage value of the direct current power supply detected by the voltage detection module is between the first preset voltage threshold and the second preset voltage threshold, the frequency converter uses the power provided by the photovoltaic power supply device and the three-phase power supply device at the same time.
Further, the frequency converter includes: and the power supply coordination module dynamically adjusts the proportion of the output electric energy of the photovoltaic power supply device and the three-phase power supply device according to the voltage value detected by the voltage detection module when the voltage value of the direct-current power supply detected by the voltage detection module is between the first preset voltage threshold and the second preset voltage threshold.
As another aspect of the present application, the present application further provides a frequency converter, which can be adapted to a photovoltaic power supply device and a three-phase power supply device to supply power to an electric device; the frequency converter includes: the voltage detection module is used for detecting the voltage value of a direct current power supply of the photovoltaic power supply device; and when the voltage value of the direct-current power supply detected by the voltage detection module exceeds a first preset voltage threshold value, the frequency converter turns off the input of the three-phase power supply device to the alternating-current power supply of the frequency converter.
Further, when the voltage value of the dc power supply detected by the voltage detection module is lower than a second preset voltage threshold, the converter turns off the input of the photovoltaic power supply device to the dc power supply of the converter.
Further, when the voltage value of the direct current power supply detected by the voltage detection module is between the first preset voltage threshold and the second preset voltage threshold, the frequency converter uses the power provided by the photovoltaic power supply device and the three-phase power supply device at the same time.
Further, the frequency converter includes: and the power supply coordination module dynamically adjusts the proportion of the output electric energy of the photovoltaic power supply device and the three-phase power supply device according to the voltage value detected by the voltage detection module when the voltage value of the direct-current power supply detected by the voltage detection module is between the first preset voltage threshold and the second preset voltage threshold.
Further, the frequency converter includes: the super capacitor is used for storing electric energy, and when the voltage value of the direct-current power supply detected by the voltage detection module exceeds a first preset voltage threshold value, the frequency converter charges the super capacitor; and when the voltage value of the direct-current power supply detected by the voltage detection module is lower than a second preset voltage threshold value, the frequency converter discharges the super capacitor to at least supply the super capacitor to the voltage detection module.
The application has the advantages that: the self-coordinated multi-element power supply system and the frequency converter thereof can coordinate the power supply use proportion according to the power supply input condition so as to ensure the power supply stability.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a block diagram schematic of an architecture of a self-coordinated multi-element power supply system according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a self-coordinated multi-element power supply system includes: the system comprises a photovoltaic power supply device, a three-phase power supply device and a frequency converter; the photovoltaic power supply device is used for converting light energy into electric energy to provide a direct-current power supply; the three-phase power supply device is used for getting power from a power grid to provide three alternating current power supplies; the frequency converter is used for coordinating the power supply proportion of the photovoltaic power supply device and the three-phase power supply device according to the power supply states of the photovoltaic power supply device and the three-phase power supply device.
Specifically, the frequency converter includes: the voltage detection module is used for detecting the voltage value of a direct-current power supply of the photovoltaic power supply device; when the voltage value of the direct current power supply detected by the voltage detection module exceeds a first preset voltage threshold value, the frequency converter turns off the input of the three-phase power supply device to the alternating current power supply of the frequency converter.
Specifically, when the voltage value of the direct current power supply detected by the voltage detection module is lower than a second preset voltage threshold, the frequency converter turns off the input of the photovoltaic power supply device to the direct current power supply of the frequency converter.
Specifically, when the voltage value of the direct current power supply detected by the voltage detection module is between a first preset voltage threshold and a second preset voltage threshold, the frequency converter uses the power supplied by the photovoltaic power supply device and the three-phase power supply device at the same time.
Specifically, the frequency converter includes: and the power supply coordination module dynamically adjusts the proportion of the output electric energy of the photovoltaic power supply device and the three-phase power supply device according to the voltage value detected by the voltage detection module when the voltage value of the direct-current power supply detected by the voltage detection module is between a first preset voltage threshold value and a second preset voltage threshold value.
As another aspect of the present application, the present application further provides a frequency converter, which can be adapted to a photovoltaic power supply device and a three-phase power supply device to supply power to an electric device; the frequency converter includes: the voltage detection module is used for detecting the voltage value of a direct-current power supply of the photovoltaic power supply device; when the voltage value of the direct current power supply detected by the voltage detection module exceeds a first preset voltage threshold value, the frequency converter turns off the input of the three-phase power supply device to the alternating current power supply of the frequency converter.
Specifically, when the voltage value of the direct current power supply detected by the voltage detection module is lower than a second preset voltage threshold, the frequency converter turns off the input of the photovoltaic power supply device to the direct current power supply of the frequency converter.
Specifically, when the voltage value of the direct current power supply detected by the voltage detection module is between a first preset voltage threshold and a second preset voltage threshold, the frequency converter uses the power supplied by the photovoltaic power supply device and the three-phase power supply device at the same time.
Specifically, the frequency converter includes: and the power supply coordination module dynamically adjusts the proportion of the output electric energy of the photovoltaic power supply device and the three-phase power supply device according to the voltage value detected by the voltage detection module when the voltage value of the direct-current power supply detected by the voltage detection module is between a first preset voltage threshold value and a second preset voltage threshold value. The scale referred to herein is a power scale.
Specifically, the frequency converter includes: the super capacitor is used for storing electric energy, and when the voltage value of the direct-current power supply detected by the voltage detection module exceeds a first preset voltage threshold value, the frequency converter charges the super capacitor; and when the voltage value of the direct-current power supply detected by the voltage detection module is lower than a second preset voltage threshold value, the frequency converter discharges the super capacitor to at least supply the super capacitor to the voltage detection module. Meanwhile, the super capacitor can supply power for weak current parts of the frequency converter, such as a control circuit.
The self-coordinated photovoltaic frequency converter is mainly provided by three-phase power 380VAC and photovoltaic electric energy, the three-phase power 380VAC is connected to input terminals (an R terminal, an S terminal and a T terminal) of the photovoltaic frequency converter, and a bus terminal (+ a terminal or a terminal) is connected to a photovoltaic power supply; the power supply proportion between three-phase electricity and a photovoltaic power supply can be adjusted in real time along with the change of the illumination intensity, when the illumination intensity meets the electric energy required by the full-load operation of the photovoltaic frequency converter, the electric energy is provided by 100 percent of the photovoltaic electric energy, and the three-phase electricity input is automatically closed; when the energy provided by the photovoltaic electric energy is insufficient to support the electric energy required by full-load carrying along with weakening of illumination, the three-phase power supply automatically provides the electric energy, the photovoltaic electric energy accounts for less than 100%, and the three-phase electric energy accounts for more than 0%; when the illumination intensity can not provide energy for the photovoltaic, the photovoltaic power supply is automatically closed, and the electric energy required by the photovoltaic frequency converter is completely provided by the three-phase power 380VAC, so that the photovoltaic frequency converter can be ensured to operate at full load all the day. The photovoltaic energy is fully utilized in the running and application process of the photovoltaic energy automatic coordination device, energy is saved, meanwhile, the photovoltaic energy automatic coordination device is further ensured to be capable of continuously operating at full load through three-phase power supply, and working efficiency is improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A self-coordinated multi-element power supply system, characterized by:
the self-coordinated multi-element power supply system comprises: the system comprises a photovoltaic power supply device, a three-phase power supply device and a frequency converter;
wherein,
the photovoltaic power supply device is used for converting light energy into electric energy to provide a direct current power supply;
the three-phase power supply device is used for taking power from a power grid to provide three alternating current power supplies;
the frequency converter is used for coordinating the power supply proportion of the photovoltaic power supply device and the three-phase power supply device according to the power supply states of the photovoltaic power supply device and the three-phase power supply device.
2. The self-coordinated multi-element power supply system according to claim 1, wherein:
the frequency converter includes:
the voltage detection module is used for detecting the voltage value of a direct current power supply of the photovoltaic power supply device;
and when the voltage value of the direct-current power supply detected by the voltage detection module exceeds a first preset voltage threshold value, the frequency converter turns off the input of the three-phase power supply device to the alternating-current power supply of the frequency converter.
3. The self-coordinated multi-element power supply system according to claim 2, wherein:
and when the voltage value of the direct-current power supply detected by the voltage detection module is lower than a second preset voltage threshold value, the frequency converter cuts off the input of the photovoltaic power supply device to the direct-current power supply of the frequency converter.
4. The self-coordinated multi-element power supply system according to claim 3, wherein:
when the voltage value of the direct-current power supply detected by the voltage detection module is between the first preset voltage threshold and the second preset voltage threshold, the frequency converter simultaneously uses the power supplies provided by the photovoltaic power supply device and the three-phase power supply device.
5. The self-coordinated multi-element power supply system according to claim 4, wherein:
the frequency converter includes: and the power supply coordination module dynamically adjusts the proportion of the output electric energy of the photovoltaic power supply device and the three-phase power supply device according to the voltage value detected by the voltage detection module when the voltage value of the direct-current power supply detected by the voltage detection module is between the first preset voltage threshold and the second preset voltage threshold.
6. A frequency converter, which can be adapted to a photovoltaic supply and a three-phase supply to supply an electrical consumer; the method is characterized in that:
the frequency converter includes:
the voltage detection module is used for detecting the voltage value of a direct current power supply of the photovoltaic power supply device;
and when the voltage value of the direct-current power supply detected by the voltage detection module exceeds a first preset voltage threshold value, the frequency converter turns off the input of the three-phase power supply device to the alternating-current power supply of the frequency converter.
7. The frequency converter of claim 6, wherein:
and when the voltage value of the direct-current power supply detected by the voltage detection module is lower than a second preset voltage threshold value, the frequency converter cuts off the input of the photovoltaic power supply device to the direct-current power supply of the frequency converter.
8. The frequency converter of claim 7, wherein:
when the voltage value of the direct-current power supply detected by the voltage detection module is between the first preset voltage threshold and the second preset voltage threshold, the frequency converter simultaneously uses the power supplies provided by the photovoltaic power supply device and the three-phase power supply device.
9. The frequency converter of claim 8, wherein:
the frequency converter includes: and the power supply coordination module dynamically adjusts the proportion of the output electric energy of the photovoltaic power supply device and the three-phase power supply device according to the voltage value detected by the voltage detection module when the voltage value of the direct-current power supply detected by the voltage detection module is between the first preset voltage threshold and the second preset voltage threshold.
10. The frequency converter of claim 9, wherein:
the frequency converter includes: the super capacitor is used for storing electric energy, and when the voltage value of the direct-current power supply detected by the voltage detection module exceeds a first preset voltage threshold value, the frequency converter charges the super capacitor; and when the voltage value of the direct-current power supply detected by the voltage detection module is lower than a second preset voltage threshold value, the frequency converter discharges the super capacitor to at least supply the super capacitor to the voltage detection module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011188817.8A CN112366696A (en) | 2020-10-30 | 2020-10-30 | Self-coordinated multi-element power supply system and frequency converter thereof |
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| CN202011188817.8A CN112366696A (en) | 2020-10-30 | 2020-10-30 | Self-coordinated multi-element power supply system and frequency converter thereof |
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Application publication date: 20210212 |