CN109842116B - Power supply device and method - Google Patents
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- CN109842116B CN109842116B CN201910120698.3A CN201910120698A CN109842116B CN 109842116 B CN109842116 B CN 109842116B CN 201910120698 A CN201910120698 A CN 201910120698A CN 109842116 B CN109842116 B CN 109842116B
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Abstract
The invention provides a power supply device and a power supply method, and relates to the technical field of power electronics. The power supply device comprises at least one first electric energy conversion module, wherein the input end of the first electric energy conversion module is connected with alternating current, and the first electric energy conversion module is used for converting the alternating current into direct current and outputting the direct current, or compensating the input current according to the requirement when the input current of the power supply device is abnormal. The power supply device and the power supply method have the advantages of small size, low cost and capability of quickly compensating the input current.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a power supply device and a power supply method.
Background
In the traditional communication machine room or the emerging electric automobile charging industry, the ACDC system has a large number of applications, the equipment base number of the traditional machine room is large, the number of electric automobiles is rapidly increased, and the access of a large number of nonlinear loads ensures that the ACDC system generates certain harmonic waves and reactive power, thereby causing the power quality problem of a power distribution network to a certain extent.
The power quality problem is generally expressed as an increase in reactive power, which causes a decrease in power factor and an increase in power cost penalty, and an increase in the deterioration of equipment and lines due to an increase in loss, and a harmonic wave becomes large.
In response to this problem, compensation equipment is often required to be added to the power supply system. In the prior art, an FC (Fixed capacitor) or SVG (static Var Generator) is generally adopted, but the compensation capacity of a parallel capacitor bank is generally large, fine adjustment cannot be performed, the switching speed is slow, and rapid adjustment cannot be performed; the static reactive compensator has larger volume and higher manufacturing cost, and is generally used in large-capacity occasions.
In view of the above, how to solve the above problems is the focus of attention of those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a power supply apparatus, so as to solve the problems of the prior art that the compensation device added to the power supply system has a large volume, a high cost and cannot be adjusted quickly.
Another objective of the present invention is to provide a power supply method to solve the problems of the prior art that the compensation device added to the power supply system has a large volume, a high cost and cannot be adjusted quickly.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in one aspect, the present invention provides a power supply device, where the power supply device includes at least one first power conversion module, an input end of the first power conversion module is connected to an alternating current, and the first power conversion module is configured to convert the alternating current into a direct current and output the direct current, or compensate an input current of the power supply device as needed when the input current is abnormal.
Further, the first power conversion module comprises a bidirectional PFC, a control unit and a current sampling module, the control unit is electrically connected with the bidirectional PFC and the current sampling module respectively, the bidirectional PFC is connected with the alternating current through an input bus, the current sampling module is configured to collect an input current of the input bus and transmit the input current to the control unit, the bidirectional PFC is configured to convert the alternating current into a direct current when in a first working mode, and the control unit is configured to switch a working mode of the bidirectional PFC as needed when a phase and a waveform of the input current are not in a state of completely following a phase and a waveform of an input voltage, so as to compensate the input current.
Further, the bidirectional PFC is further configured to convert the direct current into an alternating current when in the second operation mode, and the control unit is configured to control the bidirectional PFC to alternately operate at a high frequency according to the first operation mode and the second operation mode to compensate the input current when the phase and the waveform of the input current are not in a state of completely following the phase and the waveform of the input voltage.
Further, the power supply device comprises a first power conversion module, and the control unit is configured to control the bidirectional PFC to be in a state of high-frequency alternate operation between a first operation mode and a second operation mode when the phase and the waveform of the input current are not in a state of completely following the phase and the waveform of the voltage.
Further, the power supply device includes at least two first power conversion modules, and the control unit is configured to control the bidirectional PFC to be in a state where the first operating mode and the second operating mode alternately operate at a high frequency, or control the bidirectional PFC to be in the first operating mode, when the phase and the waveform of the current are not in a state of completely following the phase and the waveform of the voltage.
Further, the first power conversion module further comprises a DC/DC module electrically connected to the bidirectional PFC.
Furthermore, the power supply device further comprises at least one second electric energy conversion module, the second electric energy conversion module is connected with the first electric energy conversion module in parallel, and the second electric energy conversion module is used for converting the alternating current into direct current and outputting the direct current.
Further, the second power conversion module comprises a unidirectional PFC and DC/DC module, the unidirectional PFC is connected with the alternating current through an input bus, and the unidirectional PFC is electrically connected with the DC/DC module.
In another aspect, an embodiment of the present invention further provides a power supply method, where the power supply method is applied to a power supply device, and the power supply method includes:
when the input current is abnormal, the first electric energy conversion module compensates the input current according to the requirement;
when the input current is normal, the first electric energy conversion module converts the alternating current into the direct current and outputs the direct current.
Further, the first power conversion module includes a bidirectional PFC, a control unit, and a current sampling module, the control unit is electrically connected to the bidirectional PFC and the current sampling module, the bidirectional PFC is connected to the ac through an input bus, and when an input current is abnormal, the first power conversion module compensates the input current as needed, including:
the current sampling module collects the input current of the input bus and transmits the input current to the control unit;
the control unit compensates the input current when the phase and waveform of the input current are not in a state of completely following the phase and waveform of the input voltage.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a power supply device and a method, wherein the power supply device comprises at least one first electric energy conversion module, the input end of the first electric energy conversion module is connected with alternating current, and the first electric energy conversion module is used for converting the alternating current into direct current and outputting the direct current, or compensating the input current according to the requirement when the input current of the power supply device is abnormal. The first electric energy conversion module provided by the invention can realize the conversion of alternating current into direct current and output, and can also realize the compensation of input current when the input current is abnormal, so that other compensation devices are not needed, the volume of the whole power supply device is smaller, and the cost is lower. And because the functions of compensation and electric energy conversion are integrated in the first electric energy conversion module, the first electric energy conversion module can be used for compensating the input current in real time according to the requirement, and the effect of quick adjustment is realized.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a block schematic diagram of a first power supply device provided by an embodiment of the invention.
Fig. 2 shows a module schematic diagram of a first power conversion module provided by an embodiment of the invention.
Fig. 3 shows a block diagram of a second power supply device provided by the embodiment of the invention.
Fig. 4 shows a block diagram of a third power supply device provided by the embodiment of the invention.
Fig. 5 shows a flow chart of a power supply method provided by an embodiment of the invention.
Fig. 6 shows a flowchart of the sub-steps of step S102 in fig. 5 provided by the embodiment of the present invention.
Icon: 100-a power supply device; 110-a first electrical energy conversion module; 111-bidirectional PFC; 112-a control unit; 113-a current collection module; 114-a DC/DC module; 120-a second power conversion module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
First embodiment
Referring to fig. 1, an embodiment of the present invention provides a power supply device, which includes at least one first power conversion module, where an input end of the first power conversion module is connected to an alternating current, and the first power conversion module is configured to convert the alternating current into a direct current and output the direct current, and compensate an input current of the power supply device according to a requirement when the input current is abnormal.
Specifically, referring to fig. 2, in the present embodiment, the first power conversion module includes a bidirectional PFC, a control unit and a current sampling module, the control unit is electrically connected to the bidirectional PFC and the current sampling module respectively, the bidirectional PFC accesses an alternating current through an input bus, and the current sampling module is configured to collect an input current of the input bus and transmit the input current to the control unit.
The input alternating current is three-phase alternating current, and in order to realize sampling of input current (namely three-phase alternating current output current) of an input bus, the current sampling module is respectively electrically connected with the three-phase output end so as to sample the three-phase alternating current output current in the working process of the power supply device.
Meanwhile, the bidirectional PFC provided in this embodiment includes a first operating mode and a second operating mode, where the first operating mode refers to the bidirectional PFC operating in an AC/DC state, that is, the bidirectional PFC operating in a state of converting an alternating current into a direct current; the second operation mode refers to the bidirectional PFC being operated in a DC/AC state, i.e. the bidirectional PFC is operated in a state of converting direct current into alternating current. Meanwhile, in the working process, the power supply device can collect output voltage.
In the process of power supply, the waveform of the input current may be distorted or phase shift may occur, so that the phase and the waveform of the current and the phase and the waveform of the voltage are abnormal, that is, the phase and the waveform of the current are not in a state of completely following the phase and the waveform of the voltage, and further, the harmonic wave and the reactive power of the whole power supply device are larger, the power factor is lower, and the electric energy quality is lower. Therefore, after the control unit receives the input current and the input voltage information of the input bus, whether the phase and the waveform of the input current completely follow the phase and the waveform of the input voltage or not can be judged, and if not, the first electric energy conversion module compensates the input current.
The specific compensation mode is as follows: when the bidirectional PFC is in the first working mode, alternating current is converted into direct current, and if the control unit judges that the phase and the waveform of the input current do not completely follow the phase and the waveform of the input voltage, the bidirectional PFC is controlled to be converted into a state of alternately working at high frequency according to the first working module and the second working mode, so that the compensation of the waveform and the phase of the input current is realized. It should be noted that, because the power supply device provided in this embodiment continuously performs the sampling process by the current sampling module in the power supply process, the control unit can monitor the waveform and the phase of the input current in real time, and compensate the input current when the waveform of the input current is distorted or phase-shifted, thereby achieving the effect of improving the power quality.
Meanwhile, the direct current converted from the alternating current through the bidirectional PFC is the high-voltage direct current, so the first electric energy conversion module provided by this embodiment further includes a DC/DC module, and the DC/DC module is electrically connected to the bidirectional PFC and is configured to convert the high-voltage direct current into a required voltage, thereby implementing a voltage reduction process.
Further, in this embodiment, the DC/DC module includes a unidirectional DC/DC module and a bidirectional DC/DC module, which is not limited in this embodiment.
The following describes in detail a specific implementation of the power supply device provided in the embodiment:
as a first implementation manner of this embodiment, please refer to fig. 3, the power supply device includes only 1 first power conversion module, when the control unit detects that the phase and the waveform of the input current are not in a state of completely following the phase and the waveform of the input voltage, the first power conversion module is in a state of high-frequency alternating operation according to the first operation mode and the second operation mode to compensate the input current, and when the control unit detects that the phase and the waveform of the input current are in a state of completely following the phase and the waveform of the input voltage again, the control unit controls the first power conversion module to be in the first operation mode to perform power conversion.
As a second implementation manner of this embodiment, please refer to fig. 4, the power supply device includes at least 2 first power conversion modules, for example, the power supply device includes 3 first power conversion modules, when the phase and the waveform of the input current are not in a state completely following the phase and the waveform of the input voltage, at least one of the first power conversion modules is in a current compensation state, for example, one of the first power conversion modules is in the current compensation state, and the other two first power conversion modules are in power conversion states, that is, the other two first power conversion modules are in the first operating mode. For the control unit of each first power conversion module, the control unit may control the bidirectional PFC to be in a state of high-frequency alternate operation between the first operation mode and the second operation mode, or control the bidirectional PFC to be in the first operation mode, so that the determination of the operation mode of the first power conversion module according to actual requirements is realized, and the whole power supply device supplies power more flexibly.
As a third implementation manner of the present embodiment, please refer to fig. 1, the power supply device includes at least 1 first power conversion module and at least 1 second power conversion module, the second power conversion module is connected in parallel with the first power conversion module, and the second power conversion module is configured to convert an alternating current into a direct current and output the direct current.
The second electric energy conversion module comprises a one-way PFC and DC/DC module, the one-way PFC is connected with alternating current through an input bus, and the one-way PFC is electrically connected with the DC/DC module. That is, in this embodiment, the second power conversion module can only operate in the first operating mode, and in an actual power supply process, when the phase and the waveform of the input current are not in a state of completely following the phase and the waveform of the input voltage, at least one first power conversion module is in a current compensation state. For example, the power supply device includes 2 first power conversion modules and 2 second power conversion modules, and 1 or 2 of the first power conversion modules are in a high-frequency alternating operation state according to a first operation mode and a second operation mode, while 2 of the second power conversion modules are in the first operation mode, so as to implement normal power supply.
It should be noted that the power supply device provided by this embodiment can normally implement dc output power supply, and can also dynamically compensate the system input current, the compensation speed is fast, the accuracy is high, and no additional equipment is required, so the volume and the cost are greatly reduced; the power factor of the whole system is improved, additional electric charge is not generated, in addition, the harmonic wave of the input port is reduced, and the service life of the equipment is prolonged greatly.
Second embodiment
Referring to fig. 5, an embodiment of the present invention provides a power supply method, where the power supply method is applied to the power supply apparatus of the first embodiment, and the power supply method includes:
step S101, the first electric energy conversion module determines whether the input current of the power supply device is abnormal, if so, step S102 is executed, and if not, step S103 is executed.
In this embodiment, the first power conversion module determines whether the input current of the power supply device is abnormal by determining whether the phase and the waveform of the input current are in a state of completely following the phase and the waveform of the input voltage.
Step S102, the first electric energy conversion module compensates the input current according to the requirement.
Referring to fig. 6, step S102 includes:
and in the substep S1021, the current sampling module collects the input current of the input bus and transmits the input current to the control unit.
In sub-step S1022, the control unit determines whether the phase and waveform of the input current completely follow the phase and waveform of the input voltage, and if not, performs sub-step S1023.
In the substep S1023, the first power conversion module compensates the input current as needed.
It can be understood that, in this embodiment, compensation for the input current is realized by controlling the operating mode of the bidirectional PFC, so as to improve the power quality. When the plurality of first electric energy conversion modules exist in the power supply device at the same time, each first electric energy conversion module can be selectively in an electric energy conversion or current compensation working state according to actual requirements.
In step S103, the first electric energy conversion module converts the ac power into the dc power and outputs the dc power.
It can be understood that the power supply device provided in this embodiment may also include a second electric energy conversion module, and the second electric energy conversion module may also be configured to convert the alternating current into the direct current and output the direct current.
In summary, the present invention provides a power supply device and a method, wherein the power supply device includes at least one first power conversion module, an input end of the first power conversion module is connected to an alternating current, and the first power conversion module is configured to convert the alternating current into a direct current and output the direct current, or compensate an input current of the power supply device according to a requirement when the input current is abnormal. The first electric energy conversion module provided by the invention can realize the conversion of alternating current into direct current and output, and can also realize the compensation of input current when the input current is abnormal, so that other compensation devices are not needed, the volume of the whole power supply device is smaller, and the cost is lower. And because the functions of compensation and electric energy conversion are integrated in the first electric energy conversion module, the first electric energy conversion module can be used for compensating the input current in real time according to the requirement, and the effect of quick adjustment is realized.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (8)
1. A power supply device is characterized by comprising at least one first electric energy conversion module, wherein an input end of the first electric energy conversion module is connected with alternating current, and the first electric energy conversion module is used for converting the alternating current into direct current and outputting the direct current, or compensating the input current of the power supply device according to needs when the input current is abnormal; wherein the content of the first and second substances,
the first electric energy conversion module comprises a bidirectional PFC, a control unit and a current sampling module, wherein the control unit is respectively electrically connected with the bidirectional PFC and the current sampling module, the bidirectional PFC is connected with the alternating current through an input bus, the current sampling module is used for collecting the input current of the input bus and transmitting the input current to the control unit, the bidirectional PFC is used for converting the alternating current into direct current when in a first working mode, and the control unit is used for switching the working mode of the bidirectional PFC as required to compensate the input current when the phase and the waveform of the input current are not in a state of completely following the phase and the waveform of input voltage, wherein the input current of the input bus is the input current of the power supply device;
the bidirectional PFC is also used for converting direct current into alternating current when in a second working mode, and the control unit is used for controlling the bidirectional PFC to work alternately at high frequency according to a first working mode and a second working mode when the phase and the waveform of the input current are not in a state of completely following the phase and the waveform of the input voltage so as to compensate the input current.
2. The power supply of claim 1 wherein said power supply includes a first power conversion module, and said control unit is configured to control said bidirectional PFC in a first mode of operation and a second mode of operation in high frequency alternation when the phase and waveform of said input current do not completely follow the phase and waveform of said input voltage.
3. The power supply device according to claim 1, wherein the power supply device comprises at least two first power conversion modules, and the control unit is configured to control the bidirectional PFC to be in a state of high-frequency alternating operation between the first operation mode and the second operation mode or to be in the first operation mode when the phase and the waveform of the current are not in a state of completely following the phase and the waveform of the input voltage.
4. The power supply of claim 1 wherein said first power conversion module further comprises a DC/DC module, said DC/DC module being electrically connected to said bidirectional PFC.
5. The power supply device according to claim 1, wherein the power supply device further comprises at least one second power conversion module, the second power conversion module is connected in parallel with the first power conversion module, and the second power conversion module is configured to convert the alternating current into direct current and output the direct current.
6. The power supply device according to claim 5, wherein the second power conversion module comprises a unidirectional PFC and a DC/DC module, the unidirectional PFC accesses the alternating current through an input bus, and the unidirectional PFC is electrically connected with the DC/DC module.
7. A power supply method applied to the power supply apparatus according to any one of claims 1 to 6, the power supply method comprising:
when the input current is abnormal, the first electric energy conversion module compensates the input current according to the requirement;
when the input current is normal, the first electric energy conversion module converts the alternating current into the direct current and outputs the direct current.
8. The power supply method according to claim 7, wherein the first power conversion module comprises a bidirectional PFC, a control unit and a current sampling module, the control unit is electrically connected to the bidirectional PFC and the current sampling module respectively, the bidirectional PFC accesses the alternating current through an input bus, and when an input current is abnormal, the first power conversion module compensates the input current as required, and the step of compensating the input current comprises:
the current sampling module collects the input current of the input bus and transmits the input current to the control unit;
the control unit compensates the input current when the phase and waveform of the input current are not in a state of completely following the phase and waveform of the input voltage.
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Address after: E206-2, R & D building, building e, HUanpu science and Technology Industrial Park, 211 tianguba Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Patentee after: Xi'an Telai Intelligent Charging Technology Co.,Ltd. Address before: E206-2, R & D building, building e, HUanpu science and Technology Industrial Park, 211 tianguba Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Patentee before: XI'AN TGOOD INTELLIGENT CHARGING TECHNOLOGY Co.,Ltd. |
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