CN114552568A - Power supply system, control method and power electronic equipment - Google Patents
Power supply system, control method and power electronic equipment Download PDFInfo
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- CN114552568A CN114552568A CN202210101842.0A CN202210101842A CN114552568A CN 114552568 A CN114552568 A CN 114552568A CN 202210101842 A CN202210101842 A CN 202210101842A CN 114552568 A CN114552568 A CN 114552568A
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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Abstract
The application provides a power supply system, a control method and power electronic equipment. The power supply system comprises a first power supply module, a second power supply module, a power conversion module and a control module. The first power supply module is used for supplying power for the control module, the second power supply module is electrically connected to the power conversion module and used for outputting first voltage to the power conversion module in a working state, the control module is used for outputting a first control signal to the first power supply module and the power conversion module when starting so as to control the first power supply module and the power conversion module to enter the working state, and the power conversion module is used for converting the first voltage into second voltage in the working state so as to supply power for the transformer. By adopting the embodiment of the application, the magnetizing inrush current of the transformer can be effectively inhibited, and the safety and stability of the power system are improved.
Description
Technical Field
The present disclosure relates to the field of power devices, and particularly to a power supply system, a control method thereof, and a power electronic device.
Background
The power transformer is a very important device in the power system, and the importance of the power transformer is directly related to the safe and stable operation of the whole power system. At the moment of switching on and off of the circuit breaker in the power system, the phase angle of the system voltage has randomness, saturation of magnetic flux of a transformer core and nonlinear characteristics of a core material, and very large magnetizing inrush current can be generated.
Excessive excitation inrush current not only can cause frequent tripping or damage to a bypass module when the transformer is started, but also can increase the heat generated by an iron core of the transformer, thereby affecting the service life of the transformer and the safety and stability of a power system.
Disclosure of Invention
In view of this, the present application provides a power supply system, a control method and a power electronic device, which can effectively suppress the magnetizing inrush current of a transformer and improve the safety and stability of a power system.
In a first aspect, an embodiment of the present application provides a power supply system, which includes a first power supply module, a control module, a second power supply module, and a power conversion module; the first power supply module is used for supplying power to the control module; the control module is used for outputting a first control signal to the first power supply module and the power conversion module when the power conversion module is started so as to control the first power supply module and the power conversion module to enter a working state; the second power supply module is electrically connected to the power conversion module and is used for outputting a first voltage to the power conversion module in a working state. The power conversion module is used for converting the first voltage into a second voltage in a working state to supply power to the transformer.
By adopting the embodiment of the application, the power supply is supplied to the control module through the first power supply module, and when the control module is started, the first power supply module and the power conversion module are controlled to enter the working state, and the second voltage output by the power conversion module is slowly increased, so that the magnetizing inrush current of the transformer can be effectively inhibited, and the safety and stability of the power system can be improved.
In a possible design, the power supply system further includes a bypass module, the power conversion module is electrically connected to the primary side of the transformer, and the bypass module is electrically connected between the secondary side of the transformer and the first power supply module, and is used for conducting or breaking an electrical connection between the secondary side of the transformer and the first power supply module. Based on the design, the first power supply module or the second power supply module can supply power to the load.
In a possible design, the control module is further configured to output a second control signal to the bypass module at startup to break an electrical connection between the secondary side of the transformer and the first power supply module. Based on the design, the second power supply module can be controlled to supply power to the transformer, and the second voltage output by the power conversion module can inhibit the magnetizing inrush current of the transformer.
In a possible design, the power supply system further includes an automatic transfer switch module and a third power supply module, the first power supply module and the third power supply module are electrically connected to two input ends of the automatic transfer switch module, the control module is electrically connected to an output end of the automatic transfer switch module, and the automatic transfer switch module is configured to supply power to the control module through the first power supply module or the third power supply module. Based on the design, when the first power supply module is powered off, the third power supply module supplies power, and the power supply stability of the power system is ensured.
In one possible design, the bypass module is electrically connected to the control module, and the control module is configured to control the bypass module to conduct the electrical connection between the automatic transfer switch module and the secondary side of the transformer when the transformer normally operates; the automatic change-over switch module is further used for transmitting the voltage of the first power supply module or the third power supply module to load equipment for power supply when the bypass module is conducted. Based on the design, the first power supply module or the third power supply module can be switched to supply power to the load when the voltage of the transformer is stable.
In a possible design, the power supply system further includes a dc bus bar electrically connected between the second power supply module and the power conversion module, so as to transmit the first voltage of the second power supply module to the power conversion module.
In a possible design, the first power supply module further includes a photovoltaic unit electrically connected to the dc bus bar for supplying power to the power conversion module through the dc bus bar. Based on such a design, the stability of the output voltage of the power conversion module can be ensured.
In a possible design, the first power supply module further includes a battery energy storage unit electrically connected to the dc bus bar for supplying power to the power conversion module through the dc bus bar. Based on such a design, the stability of the output voltage of the power conversion module can be ensured.
In a possible design, the power supply system further includes a dc bus, the second power supply module further includes a voltage conversion unit, the voltage conversion unit is electrically connected to the first power supply module and the dc bus, and the voltage conversion unit is configured to convert the voltage of the first power supply module, so as to supply the converted voltage to the power conversion module through the dc bus. Based on such a design, the stability of the output voltage of the power conversion module can be ensured.
In a second aspect, an embodiment of the present application provides a control method for a power supply system, which is applied to a power supply system that includes a first power supply module, a second power supply module, a power conversion module, and a control module; the control method comprises the following steps: controlling a first power supply module to supply power to the control module; outputting a first control signal to the second power supply module and the power conversion module to control the second power supply module and the power conversion module to enter a working state; in a working state, the second power supply module outputs a first voltage to the power conversion module, and the power conversion module converts the first voltage into a second voltage to supply power to the transformer. By adopting the embodiment of the application, the power supply is supplied to the control module through the first power supply module, and when the control module is started, the first power supply module and the power conversion module are controlled to enter the working state, and the second voltage output by the power conversion module is controlled to be slowly increased, so that the magnetizing inrush current of the transformer can be effectively inhibited, and the safety and stability of the power system can be improved.
In one possible design, the power supply system further includes a bypass module that is controlled to break an electrical connection between the first power supply module and the transformer when the control module is at startup; and when the output voltage of the transformer is stable, controlling the bypass module to conduct the electric connection between the first power supply module and the transformer. Based on the design, the first power supply module or the second power supply module can supply power to the load.
In a third aspect, an embodiment of the present application further provides a power electronic device, configured to supply power to a load device, where the power electronic device includes a transformer and the power supply system as described above, and the transformer is electrically connected between the power supply system and the load device.
According to the power supply system, the control method and the power electronic equipment, the starting sequence of each component in the power system is controlled, so that the magnetizing inrush current influence of the transformer is reduced, and the safety and stability of the power system are improved.
Drawings
Fig. 1 is a schematic structural diagram of a power electronic device according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a power supply system according to an embodiment of the present application.
Fig. 3 is another schematic structural diagram of a power supply system according to an embodiment of the present application.
Fig. 4 is another schematic structural diagram of a power supply system according to an embodiment of the present application.
Fig. 5 is a flowchart of a control method of a power supply system according to an embodiment of the present application.
Description of the main elements
| Power |
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10 |
| Second |
11 |
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111 |
| Battery |
112 |
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113 |
| First |
12 |
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| Third |
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20 |
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the power system, when voltage suddenly increases on any side of the transformer, the side winding generates magnetic bias resisting magnetic flux linkage sudden change in the transient process based on the flux linkage conservation law, and further the iron core is possibly over-saturated, so that the exciting current of the transformer is sharply increased, and the value of the exciting current can reach tens of times of the normal operation no-load current. Excessive excitation inrush current not only can cause frequent tripping or damage to a bypass module when the transformer is started, but also can increase the heat generated by an iron core of the transformer, thereby affecting the service life of the transformer and the safety and stability of a power system.
In some scenarios, the magnetizing inrush current suppression method of some transformers may be: 1. the size of the magnetizing inrush current is limited by adopting an isolation transformer mode so as to reduce the influence of the magnetizing inrush current on a power system; 2. reasonably selecting a distribution switch, and increasing the shock resistance of a bypass circuit to avoid the risk brought by excitation inrush current; 3. increasing impedance in a primary side line of a transformer to accelerate current attenuation so as to reduce excitation inrush current; 4. and controlling a closing phase angle to offset bias magnetism and residual magnetism so as to reduce the size of the magnetizing inrush current to reduce the risk of the power system.
In the above scenario, if the magnetizing inrush current is too large when the transformer is started, the impact resistance of the device or unit circuit in the power supply path from the commercial power to the load is required to be greater than the starting inrush current of the transformer, so the above scenario has greater constraints on device type selection and cost, and will also increase the volume and cost of the transformer, and reduce the product competitiveness of the power electronic equipment.
In view of the above problems in the above scenario, embodiments of the present application provide a transformer power supply system, a control method, and a power electronic device, where the transformer power supply system, the control method, and the power electronic device in the embodiments of the present application may be used to effectively suppress an inrush current of a transformer when a power system is started, so as to improve the safety and stability of the power system, and also reduce the system cost.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power electronic device 100 according to an embodiment of the present disclosure. It is understood that the power electronic device 100 in the embodiment of the present application may be electrically connected to the load device 200.
In one possible scenario, the power electronics 100 may be used to power the load device 200.
In a specific implementation, the power electronic device 100 may include a power supply system 10 and a transformer 20. The transformer 20 may be electrically connected between the power supply system 10 and the load device 200. It is understood that, in the embodiment of the present application, the power supply system 10 may output a voltage to the transformer 20, and the transformer 20 may convert the voltage to output a power supply voltage required by the load device 200.
It can be understood that the power supply system 10 can effectively suppress the magnetizing inrush current of the transformer 20 during the power supply of the load device 200 by the power electronic device 100, and the power electronic device 100 and the power supply system 10 in the embodiment of the present application may not need to additionally add a bypass, an automatic transfer switch, and a power distribution capacity, so that the production cost may be reduced.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a power supply system 10 according to an embodiment of the present disclosure.
The power supply system 10 in this embodiment may include a first power supply module 12, a second power supply module 11, a power conversion module 13, an Automatic Transfer Switching (ATS) module 14, and a control module 15.
In the embodiment of the present application, the second power supply module 11 may be electrically connected to the power conversion module 13, and the first power supply module 12 may be electrically connected to the ATS module 14. The ATS module 14 may be electrically connected to the control module 15 and the second power supply module 11. The first power supply module 12 may be used to supply power to the control module 15. The second power supply module 11 may be electrically connected to the power conversion module 13. The control module 15 may be connected to the second power supply module 11 and the power conversion module 13. The control module 15 may be configured to output a first control signal to the first power supply module 12 and the power conversion module 13 when powering on, where the control signal may control the first power supply module 12 and the power conversion module 13 to enter an operating state. In a possible implementation, the control module 15 may be in signal connection with the second power supply module 11 and the power conversion module 13. In this embodiment, the power conversion module 13 may be electrically connected to the transformer 20. It will be appreciated that in one embodiment, the control module 15 may be an energy control module.
When the second power supply module 11 receives the control signal output by the control module 15, the second power supply module 11 may enter an operating state, that is, the second power supply module 11 may output the first voltage to the power conversion module 13. In this embodiment, the second power supply module 11 may include a battery energy storage unit 112 and a voltage conversion unit 113, and the control module 15 may be connected to the battery energy storage unit 112 and the voltage conversion unit 113. In one possible implementation, the control module 15 may be in signal connection with the battery energy storage unit 112 and the voltage conversion unit 113. The battery energy storage unit 112 and the voltage conversion unit 113 may be electrically connected to the power conversion module 13, and may supply power to the power conversion module 13. The ATS module 14 may be electrically connected to the voltage conversion unit 113.
When the power conversion module 13 receives the control signal output by the control module 15, the power conversion module 13 may enter a working state, that is, the power conversion module 13 may convert the first voltage into a second voltage, and may further supply power to the transformer. It can be understood that the second voltage output by the power conversion module 13 is slowly increased, so that the magnetizing inrush current of the transformer can be suppressed. For example, the output voltage of the power conversion module 13 may be slowly increased between 0-220V, and the current may be slowly increased from 0, so that the initial winding magnetic field of the transformer may be established to a normal state, and the magnetizing inrush current of the transformer may be suppressed.
In this embodiment, the power supply system 10 may further include a third power supply module 17 electrically connected to the ATS module 14.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a power supply system 10 according to another embodiment of the present application.
The difference from the power supply system 10 shown in the embodiment of fig. 2 is that, as shown in fig. 3, in this embodiment, the power supply system 10 may further include a bypass module 16 and a dc bus bar 18.
The power conversion module 13 may be electrically connected to a primary side of the transformer 20, and a secondary side of the transformer 20 may be electrically connected to the load device 200. The bypass module 16 may be electrically connected between the ATS module 14 and the secondary side of the transformer 20, and the bypass module 16 may be used to make or break the electrical connection between the first power supply module 12 and the transformer 20 or the load device 200.
In a possible implementation manner, the second power supply module 11 may be configured to output a dc voltage to the power conversion module 13, and the power conversion module 13 may receive the dc voltage and convert the dc voltage into an ac voltage.
The transformer 20 may be configured to receive the ac voltage output by the power conversion module 13 and convert the ac voltage to output a supply voltage to the load device 200.
The first power supply module 12 may be configured to output an ac voltage to the ATS module 14. It is to be understood that in one embodiment, the first power supply module 12 may be a utility grid. Namely, the first power supply module 12 can output 220V of ac voltage.
In one possible implementation, the power supply system 10 may further include a third power supply module 17. The third power supply module 17 may be electrically connected to the ATS module 14. It is understood that the third power module 17 may be used to supply power to the ATS module 14 when the first power module 12 stops supplying power. I.e. the third power supply module 17 may act as a backup power supply. In one implementation, the third power supply module 17 may be an oil engine power supply module.
In this embodiment, the ATS module 14 may selectively supply the first power module 12 or the third power module 17 to the load device 200 and the control module 15. For example, when the first power supply module 12 is operating normally, the ATS module 14 may select the first power supply module 12 to supply power to the load device 200 and the control module 15. When the first power supply module 12 is abnormal, for example, when the first power supply module 12 stops supplying power, the ATS module 14 may select the third power supply module 17 to supply power to the load device 200 and the control module 15.
The control module 15 may be connected to the bypass module 16. It is understood that in one embodiment, the control module 15 may be signally connected to the bypass module 16. The control module 15 may output a control signal to the bypass module 16 to control the state of the bypass module 16. The bypass module 16 may transmit the voltage output by the ATS module 14 to the load device 200 to power the load device 200. It is understood that in some implementations, the bypass module 16 may be implemented using an electronic switch.
For example, the control module 15 may control the electronic switch to be turned on or off. When the control module 15 controls the electronic switch to be turned on, the electronic switch turns on the electrical connection between the ATS module 14 and the load device 200, and the ATS module 14 may output a supply voltage to the load device 200. When the control module 15 controls the electronic switch to be turned off, the electronic switch disconnects the electrical connection between the ATS module 14 and the load device 200, and the ATS module 14 no longer outputs a supply voltage to the load device 200.
It is understood that the control module 15 may be used to control the states of the power conversion module 13, the second power supply module 11, the bypass module 16, and the ATS module 14. For example, the control module 15 may control the bypass module 16 to be opened or closed, the control module 15 may also control the operating state of the second power supply module 11, and the control module 15 may also control the operating state of the power conversion module 13.
In this embodiment, the power supply system 10 may further include a dc bus bar 18. The dc bus 18 in this embodiment may be electrically connected between the second power supply module 11 and the power conversion module 13. Specifically, the dc bus bar 18 may transmit the voltage of the second power supply module 11 to the power conversion module 13. Optionally, the dc bus 18 may output a dc voltage of 400V to the power conversion module 13.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a power supply system 10 according to another embodiment of the present application.
The difference from the power supply system 10 shown in fig. 3 is that, as shown in fig. 4, in the present embodiment, the second power supply module 11 may include a photovoltaic unit 111, a battery energy storage unit 112, and a voltage conversion unit 113.
In this embodiment, the photovoltaic unit 111, the battery energy storage unit 112, and the voltage conversion unit 113 may be electrically connected to the dc bus 18 and the control module 15. The voltage conversion unit 113 may also be electrically connected to the first power supply module 12.
It is understood that the photovoltaic unit 111 may be used to provide a stable voltage for the dc bus bar 18. For example, when the input voltage of the photovoltaic unit 111 is 200V, the photovoltaic unit 111 may output a voltage of 400V.
In this embodiment, the battery energy storage unit 112 may be configured to provide a voltage to the dc bus bar 18, for example, the battery energy storage unit 112 may output a voltage of 48V to 400V to the dc bus bar 18.
The voltage conversion unit 113 is electrically connected to the first power supply module 12, and may receive a voltage output by the first power supply module 12, and the voltage conversion unit 113 may convert the voltage output by the first power supply module 12 and provide the converted voltage to the dc bus 18, for example, the first power supply module 12 may output an ac voltage of 220V to the voltage conversion unit 113, and the voltage conversion unit 113 may output a dc voltage of 400V to the dc bus 18.
It can be understood that the photovoltaic units 111, the battery energy storage units 112, and the voltage conversion units 113 can stabilize the output voltage of the dc bus 18 at a voltage value, for example, the photovoltaic units 111, the battery energy storage units 112, and the voltage conversion units 113 can stabilize the output voltage of the dc bus 18 at about 400V. In this embodiment, the power conversion module 13 may receive the 400V dc voltage, convert the dc voltage into an ac voltage, and output the ac voltage to the transformer 20.
In this embodiment, the control module 15 may control a starting sequence of the power conversion module 13, the second power supply module 11, the bypass module 16, and the ATS module 14 to suppress the magnetizing inrush current of the transformer 20. For example, in the initial state of the power electronic device 100, the control module 15 may first control the bypass module 16 to be in the off state, or the control module 15 may control the second power supply module 11 to operate.
It can be understood that, in this embodiment, the power conversion module 13 may have functions of current limiting and voltage regulating. For example, the power conversion module 13 may start to operate normally after receiving the voltage of the dc bus bar 18, the output voltage of the power conversion module 13 may be slowly output between 0V and 220V, and the current may be slowly increased from 0, so that the initial winding magnetic field of the transformer 20 may be established to a normal state.
It is understood that the power electronic device 100 of the embodiment of the present application may have two power supply paths to supply power to the load device 200, such as the power supply path 1 and the power supply path 2 shown in fig. 3.
In the power supply path 1, the second power supply module 11 outputs a voltage to the power conversion module 13 for conversion, the power conversion module 13 outputs the converted voltage to the primary side of the transformer 20, that is, the primary winding of the transformer 20 receives the voltage, and the secondary side (that is, the secondary winding) of the transformer 20 can output a power supply voltage to the load device 200 for power supply.
In the power supply path 2, the first power supply module 12 may output a voltage to the ATS module 14, and the ATS module 14 may output a voltage to the load device 200 and the secondary side of the transformer 20 through the bypass module 16.
The operation of the power supply system 10 of the present application will be described in detail with reference to the embodiment shown in fig. 4.
When the power system is initially powered on, the second power supply module 11 is in an off state, and the bypass module 16 is in an off state, at this time, the control module 15 may obtain power from the first power supply module 12 or the third power supply module 17, that is, the control module 15 may start to operate and may control the second power supply module 11 to operate. The control module 15 controls the photovoltaic unit 111, the battery energy storage unit 112, and the voltage conversion unit 113. At this time, the photovoltaic unit 111 and the battery energy storage unit 112 may output a voltage, or the voltage conversion unit 113 may convert the voltage of the second power supply module 11 and output the voltage, so that it may be ensured that the dc bus bar 18 may output a stable voltage. When the control module 15 detects that the dc bus 18 can output a stable voltage, the control module 15 may control the power conversion module 13 to operate. The power conversion module 13 obtains the voltage output by the dc bus 18.
Since the power conversion module 13 may have a current limiting function, that is, the output current of the power conversion module 13 may be slowly increased, or the output voltage of the power conversion module 13 may be slowly increased, the transformer 20 and the load device 200 may be supplied with power after the power conversion module 13 performs inversion, and the magnetizing inrush current of the transformer 20 may be suppressed. Therefore, the control module 15 may first control the power supply path 1 to start, thereby completing the excitation process of the transformer 20. During the excitation process, the amplitude of the excitation inrush current of the transformer 20 can be limited by the current limiting function and the soft-start function of the power conversion module 13.
When the power supply of the power electronic device 100 is stable, the control module 15 may control the bypass module 16 to conduct, that is, the ATS module 14 may be electrically connected with the load device 200 and the transformer 20. At this time, the power supply path 1 and the power supply path 2 may jointly supply power to the load device 200. Finally, the control module 15 may control the second power supply module 11 to stop working, that is, the second power supply module 11 no longer outputs voltage. At this time, the electronic power device 100 may switch from the power supply path 1 to the power supply path 2 to supply power to the load device 200 through the power supply path 2. Thus, embodiments of the present application may enable the utility grid to supply power to the load device 200 via the bypass module 16.
Thus, in the embodiment of the present application, the control module 15 may identify a power-on scenario, and may schedule the second power supply module 11 to perform a discharging or rectifying operation, so as to avoid a magnetizing inrush current risk of the transformer 20 through the current limiting function of the power conversion module 13.
Referring to fig. 5, a flowchart of a control method of a power supply system according to an embodiment of the present application is shown. The control method of the power supply system may include the steps of:
step S51: the first power supply module supplies power to the control module, and the control module is electrified to work.
The power supply system 10 shown in fig. 4 is taken as an example for explanation. When the power electronic device 100 is initially powered on to operate, the control module 15 may obtain power from the first power supply module 12 or the third power supply module 17, and thus, the control module 15 starts to operate.
It is understood that in the initial power-on state of the power electronic device 100, the second power supply module 11 is in an off state, i.e., the second power supply module 11 does not output voltage, and the bypass module 16 is in an off state, i.e., the ATS module 14 and the load device 200 are in an off state.
Step S52: and outputting a first control signal to the second power supply module and the power conversion module so as to control the second power supply module and the power conversion module to enter a working state.
When the control module 15 is powered on, the control module 15 may control the second power supply module 11 to output a voltage. For example, the control module 15 may control the photovoltaic unit 111 and the battery energy storage unit 112 to start, and the photovoltaic unit 111 and the battery energy storage unit 112 may output a voltage after starting, or control the voltage conversion unit 113 to start, so as to convert the voltage of the first power supply module 12. Therefore, the direct current busbar 18 can output stable voltage.
Step S53: and controlling a power conversion module to convert the first voltage so as to output a second voltage to the transformer.
When the control module 15 detects that the dc bus 18 can output the stable first voltage, the control module 15 may control the power conversion module 13 to operate. When the second power supply module 11 and the power conversion module 13 are in a working state, the power conversion module 13 obtains a first voltage output by the dc bus 18, and converts the first voltage to output a second voltage to the transformer 20.
Since the power conversion module 13 may have a current limiting function, that is, the output current of the power conversion module 13 may be slowly increased, or the output second voltage of the power conversion module 13 may be slowly increased, the transformer 20 and the load device 200 may be supplied with power after the power conversion module 13 performs inversion, and the magnetizing inrush current of the transformer 20 may be suppressed.
Therefore, the control module 15 may first control the second power supply module 11 to start, thereby completing the excitation process of the transformer 20. During the excitation process, the amplitude of the excitation inrush current of the transformer 20 can be limited by the current limiting function and the soft-start function of the power conversion module 13.
Step S54: and controlling the bypass module to be conducted so as to output the third voltage of the first power supply module to the load equipment.
It is understood that when the control module 15 detects that the power supply of the power electronic device 100 is stable, the control module 15 may control the bypass module 16 to conduct, i.e., the ATS module 14 may be electrically connected to the load device 200 and the transformer 20. At this time, the power supply path 1 and the power supply path 2 may jointly supply power to the load device 200.
Step S55: and controlling the second power supply module to be closed so as to stop outputting the first voltage.
The control module 15 may control the second power supply module 11 to stop working, that is, the second power supply module 11 no longer outputs voltage. At this time, the power electronic apparatus 100 may switch from the power supply path 1 to the power supply path 2 to supply power to the load apparatus 200 by the power supply path 2. Thus, embodiments of the present application may enable the utility grid to supply power to the load device 200 via the bypass module 16.
By adopting the power supply system, the control method and the power electronic equipment in the embodiment of the application, the magnetizing inrush current influence of the transformer is reduced and the safety and stability of the power system are improved by controlling the starting sequence of each module in the power electronic equipment.
Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. A power supply system is characterized by comprising a first power supply module, a control module, a second power supply module and a power conversion module;
the first power supply module is used for supplying power to the control module;
the control module is used for outputting a first control signal to the first power supply module and the power conversion module when the power conversion module is started so as to control the first power supply module and the power conversion module to enter a working state;
the second power supply module is electrically connected to the power conversion module and is used for outputting a first voltage to the power conversion module in a working state;
the power conversion module is used for converting the first voltage into a second voltage in a working state to supply power to the transformer.
2. The power supply system according to claim 1,
the power supply system further comprises a bypass module, wherein the power conversion module is electrically connected to the primary side of the transformer, and the bypass module is electrically connected between the secondary side of the transformer and the first power supply module and used for conducting or breaking the electrical connection between the secondary side of the transformer and the first power supply module.
3. The power supply system according to claim 2,
the control module is further configured to output a second control signal to the bypass module at startup to break an electrical connection between the secondary side of the transformer and the first power supply module.
4. The power supply system according to claim 3,
the power supply system further comprises an automatic transfer switch module and a third power supply module, the first power supply module and the third power supply module are electrically connected to two input ends of the automatic transfer switch module, the control module is electrically connected to an output end of the automatic transfer switch module, and the automatic transfer switch module is used for supplying power to the control module through the first power supply module or the third power supply module.
5. The power supply system according to claim 4,
the bypass module is electrically connected with the control module, and the control module is used for controlling the bypass module to conduct the electric connection between the automatic transfer switch module and the secondary side of the transformer when the transformer works normally; the automatic change-over switch module is further used for transmitting the voltage of the first power supply module or the third power supply module to load equipment for power supply when the bypass module is conducted.
6. The power supply system according to any one of claims 1 to 5,
the power supply system further comprises a direct current bus bar which is electrically connected between the second power supply module and the power conversion module and used for transmitting the first voltage of the second power supply module to the power conversion module.
7. The power supply system according to claim 6,
the second power supply module further comprises a photovoltaic unit, wherein the photovoltaic unit is electrically connected to the direct-current busbar and is used for supplying power to the power conversion module through the direct-current busbar.
8. The power supply system according to claim 6,
the second power supply module further comprises a battery energy storage unit, wherein the battery energy storage unit is electrically connected to the direct-current busbar and used for supplying power to the power conversion module through the direct-current busbar.
9. The power supply system of claim 1,
the power supply system further comprises a direct-current bus bar, the second power supply module further comprises a voltage conversion unit, the voltage conversion unit is electrically connected with the first power supply module and the direct-current bus bar, and the voltage conversion unit is used for converting the voltage of the first power supply module so as to supply power to the power conversion module through the direct-current bus bar.
10. A control method of a power supply system is applied to the power supply system, and is characterized in that the power supply system comprises a first power supply module, a second power supply module, a power conversion module and a control module, and the control method of the power supply system comprises the following steps:
controlling a first power supply module to supply power to the control module;
outputting a first control signal to the second power supply module and the power conversion module to control the second power supply module and the power conversion module to enter a working state;
in a working state, the second power supply module outputs a first voltage to the power conversion module, and the power conversion module converts the first voltage into a second voltage to supply power to the transformer.
11. The control method of a power supply system according to claim 10,
the power supply system further comprises a bypass module; when the control module is started, the bypass module is controlled to disconnect the electric connection between the first power supply module and the transformer;
and when the transformer works normally, the bypass module is controlled to conduct the electric connection between the first power supply module and the transformer.
12. A power electronic device for supplying power to a load device, the power electronic device comprising a transformer and a power supply system according to any one of claims 1 to 9, the transformer being electrically connected between the power supply system and the load device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210101842.0A CN114552568A (en) | 2022-01-27 | 2022-01-27 | Power supply system, control method and power electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210101842.0A CN114552568A (en) | 2022-01-27 | 2022-01-27 | Power supply system, control method and power electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN114552568A true CN114552568A (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210101842.0A Pending CN114552568A (en) | 2022-01-27 | 2022-01-27 | Power supply system, control method and power electronic equipment |
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| Country | Link |
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| CN (1) | CN114552568A (en) |
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- 2022-01-27 CN CN202210101842.0A patent/CN114552568A/en active Pending
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