CN116760170A - Switching method of power supply system and storage medium - Google Patents
Switching method of power supply system and storage medium Download PDFInfo
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- CN116760170A CN116760170A CN202310802828.8A CN202310802828A CN116760170A CN 116760170 A CN116760170 A CN 116760170A CN 202310802828 A CN202310802828 A CN 202310802828A CN 116760170 A CN116760170 A CN 116760170A
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- 238000007599 discharging Methods 0.000 claims abstract description 52
- 238000004590 computer program Methods 0.000 claims description 19
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- 230000008569 process Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
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- 230000008878 coupling Effects 0.000 description 3
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Classifications
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides a switching method of a power supply system and a storage medium. The method is applied to a power supply system, and comprises the following steps: when the first switching instruction is detected, the battery is controlled to supply power to the direct current bus through the battery charging and discharging circuit, the third alternating current relay is controlled to be closed, and each direct current relay is controlled to be opened; when each direct current relay is detected to be opened, the first alternating current relay and the second alternating current relay are controlled to be closed; the first switching instruction is used for indicating the AC/DC shared circuit to be switched from battery power supply to AC power supply. When the battery power supply is switched to the alternating current power supply, the battery charging and discharging circuit is controlled to continue discharging, and meanwhile, a corresponding third alternating current relay which is not multiplexed with the alternating current power supply is firstly closed to supply power for the direct current bus, so that the dropping speed of the direct current bus is reduced, and the power supply of a load is maintained to a certain extent.
Description
Technical Field
The present application relates to the field of power technologies, and in particular, to a method for switching a power system and a storage medium.
Background
The UPS (Uninterruptible Power Supply) is an uninterruptible power supply with an energy storage device. The power supply is mainly used for providing uninterrupted power for equipment with higher requirements on power supply stability. The UPS is powered by the alternating current power supply when the alternating current power supply is normal, and is switched to be powered by the battery when the alternating current power supply is abnormal; when the alternating current power supply is recovered to be normal, the power supply can be switched to the alternating current power supply by the battery power supply.
In the prior art, the ac power source and the battery can be in a multiplexing topology, referring to fig. 1, when the battery power supply is switched to the ac power source, the relays K1 and K2 are turned off, and K3, K4 and K5 are turned on after the opening of the relays K1 and K2 is detected. In the switching process of the relay, the power supply is disconnected, the direct current bus drops greatly, and the normal power supply of the load is affected.
Disclosure of Invention
The embodiment of the application provides a switching method of a power supply system and a storage medium, which are used for solving the problems that in the switching process of alternating current power supply and battery power supply in the prior art, power supply is disconnected, a direct current bus drops, and load power supply is affected.
In a first aspect, an embodiment of the present application provides a method for switching a power supply system, where the power supply system is applied; the power supply system includes: the device comprises a battery, an alternating current power supply, a battery charging and discharging circuit, two alternating current-direct current sharing circuits, a rectifying circuit, two direct current relays and three alternating current relays;
the positive electrode and the negative electrode of the battery are respectively connected with a positive battery end and a negative battery end of a battery charging and discharging circuit, and a direct current end of the battery charging and discharging circuit is connected with a direct current bus;
the input end of the first AC/DC shared circuit is connected with the positive electrode of the battery through a first DC relay and is also connected with a first phase of an AC power supply through the first AC relay; the input end of the second AC/DC sharing circuit is connected with the negative electrode of the battery through a second DC relay and is also connected with a second phase of an AC power supply through a second AC relay; the output end of the first AC/DC shared circuit and the output end of the second AC/DC shared circuit are connected with a DC bus;
the input end of the rectifying circuit is connected with a third phase of an alternating current power supply through a third alternating current relay, and the output end of the rectifying circuit is connected with a direct current bus;
the battery and the alternating current power supply are used for multiplexing the first alternating current-direct current shared circuit and the second alternating current-direct current shared circuit in a time-sharing way to supply power for the direct current bus;
the switching method comprises the following steps:
when the first switching instruction is detected, the battery is controlled to supply power to the direct current bus through the battery charging and discharging circuit, the third alternating current relay is controlled to be closed, and each direct current relay is controlled to be opened;
when each direct current relay is detected to be opened, the first alternating current relay and the second alternating current relay are controlled to be closed;
the first switching instruction is used for indicating the AC/DC shared circuit to be switched from battery power supply to AC power supply.
In a second aspect, an embodiment of the present application provides a computer readable storage medium storing a computer program, where the computer program implements the steps of the switching method of the power supply system according to the first aspect of the embodiment of the present application when the computer program is executed by a processor.
The embodiment of the application provides a switching method of a power supply system and a storage medium. The method applies a power supply system; the power supply system includes: the device comprises a battery, an alternating current power supply, a battery charging and discharging circuit, two alternating current-direct current sharing circuits, a rectifying circuit, two direct current relays and three alternating current relays; the positive electrode and the negative electrode of the battery are respectively connected with a positive battery end and a negative battery end of a battery charging and discharging circuit, and a direct current end of the battery charging and discharging circuit is connected with a direct current bus; the input end of the first AC/DC shared circuit is connected with the positive electrode of the battery through a first DC relay and is also connected with a first phase of an AC power supply through the first AC relay; the input end of the second AC/DC sharing circuit is connected with the negative electrode of the battery through a second DC relay and is also connected with a second phase of an AC power supply through a second AC relay; the output end of the first AC/DC shared circuit and the output end of the second AC/DC shared circuit are connected with a DC bus; the input end of the rectifying circuit is connected with a third phase of an alternating current power supply through a third alternating current relay, and the output end of the rectifying circuit is connected with a direct current bus; the battery and the alternating current power supply are used for multiplexing the first alternating current-direct current shared circuit and the second alternating current-direct current shared circuit in a time-sharing way to supply power for the direct current bus; the switching method comprises the following steps: when the first switching instruction is detected, the battery is controlled to supply power to the direct current bus through the battery charging and discharging circuit, the third alternating current relay is controlled to be closed, and each direct current relay is controlled to be opened; when each direct current relay is detected to be opened, the first alternating current relay and the second alternating current relay are controlled to be closed; the first switching instruction is used for indicating the AC/DC shared circuit to be switched from battery power supply to AC power supply. In the embodiment of the application, when the battery is used for supplying power to the alternating current power supply, the third alternating current relay which is not multiplexed is firstly closed, the third phase of the alternating current power supply supplies power to the direct current bus, and meanwhile, the battery is controlled to continuously supply power to the direct current bus through the battery charging and discharging circuit, so that the dropping speed of the voltage of the direct current bus is greatly reduced, and the power supply of a load in the switching process is ensured to a certain extent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a power supply system according to an embodiment of the present application;
fig. 2 is a flowchart of an implementation method of a power supply system according to an embodiment of the present application;
FIG. 3 is a schematic circuit diagram of an AC/DC common circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a switching device of a power supply system according to an embodiment of the present application;
fig. 5 is a schematic diagram of a handover terminal according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, there is shown a power supply system comprising: the battery, the alternating current power supply, the battery charge-discharge circuit 11, the two alternating current-direct current sharing circuits 12, one rectifying circuit 13, the two direct current relays (K1 and K2) and the three alternating current relays (K3, K4 and K5);
the positive electrode BAT+ and the negative electrode BAT-of the battery are respectively connected with the positive battery end and the negative battery end of the battery charge-discharge circuit 11, and the direct current end of the battery charge-discharge circuit 11 is connected with a direct current BUS (BUS+ and BUS-);
the input end of the first AC/DC common circuit 12 is connected with the positive electrode BAT+ of the battery through a first DC relay K1 and is also connected with a first phase of an AC power supply through a first AC relay K3; the input end of the second AC/DC sharing circuit 12 is connected with the negative electrode BAT-of the battery through a second DC relay K2 and is also connected with a second phase of an AC power supply through a second AC relay K4; the output end of the first AC/DC sharing circuit 12 and the output end of the second AC/DC sharing circuit 12 are connected with a DC bus;
the input end of the rectifying circuit 13 is connected with a third phase of an alternating current power supply through a third alternating current relay K5, and the output end of the rectifying circuit 13 is connected with a direct current bus;
the battery and the alternating current power supply time-sharing multiplex the first alternating current-direct current common circuit 12 and the second alternating current-direct current common circuit 12 to supply power for the direct current bus.
Referring to fig. 1, when the battery is powered, the power of the circuit is limited due to the parameters of devices in the circuit, and two battery power supply paths are required to meet the power requirement of the load. Opening each alternating current relay (K3, K4 and K5), closing two direct current relays (K1 and K2), and forming a battery discharging topology by the two alternating current-direct current sharing circuits 12, wherein the battery discharging topology is used as a first battery power supply passage to supply power to a direct current bus; meanwhile, the battery also supplies power for the direct current bus through the battery charging and discharging circuit 11 to form a second battery power supply path, and the two battery power supply paths respectively bear 50% of the power required by the total power, so that the allowable power for battery discharging is improved.
When the alternating current power supply supplies power, each direct current relay (K1 and K2) is opened, each alternating current relay (K3, K4 and K5) is closed, three phases of the alternating current power supply power to a direct current bus through two alternating current-direct current sharing circuits 12 and one rectifying circuit 13 respectively, three alternating current power supply paths are formed, and the three alternating current power supply paths bear 33% of power respectively.
For the power supply system shown in fig. 1, since the ac power supply and the battery multiplex two ac/dc common circuits 12, to avoid a short circuit, the ac relay and the dc relay on the same road cannot be simultaneously closed (for example, K1 and K3 cannot be simultaneously closed, and K2 and K4 cannot be simultaneously closed). Therefore, in the prior art, when switching between ac power supply and battery power supply, it is generally necessary to close two dc relays (K1 and K2) after detecting that three ac relays (K3, K4, and K5) are opened, or to close three ac relays (K3, K4, and K5) after detecting that two dc relays (K1 and K2) are opened. Because the response time of closing or opening the relay is relatively long, and the detection of the relay also needs time, the intermediate gap of relay switching can lead to the disconnection of both the power supply of the alternating current power supply and the power supply of the battery, and the voltage of the direct current bus drops rapidly, so that the power supply of the power supply system is influenced.
Based on the above, corresponding to the power supply system shown in fig. 1, an embodiment of the present application provides a switching method of a power supply system, which is applied to the power supply system, and referring to fig. 2, the switching method includes:
s101: when the first switching instruction is detected, the battery is controlled to supply power to the direct current bus through the battery charging and discharging circuit 11, the third alternating current relay K5 is controlled to be closed, and the direct current relays (K1 and K2) are controlled to be opened;
s102: when each direct current relay (K1 and K2) is detected to be opened, controlling the first alternating current relay K3 and the second alternating current relay K4 to be closed;
the first switching command is used for instructing the ac/dc common circuit 12 to switch from battery power supply to ac power supply.
Since the battery charge/discharge circuit 11 is not multiplexed, when the first switching command is received, the battery can be continuously controlled to supply power to the dc bus through the battery charge/discharge circuit 11 (the battery charge/discharge circuit 11 is kept in a discharge state), and the dropping speed of the bus is reduced. However, since the battery charge-discharge circuit 11 is limited in power, only 50% of the power can be supplied (the circuit does not allow long-time overload), and the bus bar drops too fast. Furthermore, because the third phase of the alternating current power supply is not multiplexed, the third alternating current relay K5 can be closed at first when the first switching instruction is received, 33% of power is further supplied by the third phase of the alternating current power supply, and the two direct current relays (K1 and K2) are opened, and then the two alternating current relays (K3 and K4) are closed, so that at least 50% +33% = 83% of power output can be ensured, the falling speed of the direct current bus is further slowed down, and the power supply of a load is ensured.
In one possible implementation, S101 may include:
s1011: when a first switching instruction is detected, the battery charging and discharging circuit 11 is controlled to supply power to the direct current bus according to a first preset output power until all the alternating current relays are detected to be closed;
wherein the first preset output power is greater than the rated output power of the battery charge-discharge circuit 11.
Because the circuit allows short-time overload, the discharging power of the battery can be increased in a short time in the switching process of the relay, the voltage of the direct current bus is increased within the allowable range of the circuit, the dropping speed of the direct current bus is further reduced, and the power supply of a load is further ensured.
After detecting that each ac relay is closed, the power supply is switched, and the battery does not need to output high power. At this time, the battery charge/discharge circuit 11 may be controlled to charge or discharge the battery according to the load power condition.
The first preset output power may be 1.2 times the rated output power of the battery charging and discharging circuit 11, that is, may provide 60% of the total power demand, and may ensure at least 60% +33% = 93% of the power output during the process of opening the two dc relays and closing the two ac relays, so that the voltage of the dc bus may not drop substantially, and normal power supply of the load may be ensured.
Specifically, the first preset power may also be set according to actual application requirements, which is not limited herein.
In a possible implementation manner, after S102, the method may further include:
s103: obtaining load power and output power of an alternating current power supply;
s104: if the output power of the alternating current power supply is not less than the load power, the direct current bus is controlled to charge the battery through the battery charging and discharging circuit 11;
s105: if the output power of the alternating current power supply is smaller than the load power, the battery is controlled to supply power to the direct current bus through the battery charging and discharging circuit 11.
When the relay is switched, the charging and discharging direction of the battery charging and discharging circuit 11 can be controlled according to the load power demand, and when the alternating current power supply power is enough, the direct current bus charges the battery through the battery charging and discharging circuit 11; when the alternating current power supply is insufficient in power, the battery supplies power for the direct current bus through the battery charging and discharging circuit 11.
The output power of the ac power supply is the sum of the output powers of the two ac/dc common circuits 12 and the one rectifying circuit 13, and is affected by device parameters, control logic, and the power supply capability of the ac power supply itself.
In the embodiment of the application, the battery is only used for supplementing power supply, so that the influence of frequent charge and discharge of the battery on the service life of the battery is avoided.
In one possible embodiment, the method may further include:
s106: when a second switching instruction is detected, the battery is controlled to supply power to the direct-current bus through the battery charging and discharging circuit 11, and the first alternating-current relay K3 and the second alternating-current relay K4 are controlled to be disconnected;
s107: when the first alternating current relay K3 and the second alternating current relay K4 are detected to be opened, each direct current relay is controlled to be closed;
the second switching instruction is used for instructing the ac/dc common circuit 12 to switch from ac power supply to battery power supply.
When the battery is switched to an ac power supply, there is also a problem in that the bus bar drops. Since the battery charge-discharge circuit 11 does not need to switch a relay, the battery charge-discharge circuit 11 is controlled to switch to charge or discharge only by software. Based on this, in the embodiment of the present application, the battery charging and discharging circuit 11 is quickly switched to a discharging state by software during switching, so as to supply power to the dc bus, and then the relay is switched. Because software control is adopted, the switching time is very short, and the direct current bus can not be powered off. At least 50% of power is ensured by the battery charge-discharge circuit 11, and the falling speed of the direct current bus is reduced.
Because the third alternating current relay K5 is not multiplexed, when the alternating current power supply is switched to the battery power supply, the switching can be completed by only switching off the first alternating current relay K3 and the second alternating current relay K4, and the third alternating current relay K5 can determine whether to switch off according to the actual application requirements.
For example, if the ac power source is normal and needs to be switched for testing or maintenance, the ac relay K5 may be controlled to be turned on, the third phase of the ac power source supplies power to the dc bus, so that the dc bus voltage may be further ensured not to drop, and the third ac relay K5 is turned off after the relay is switched.
In one possible embodiment, the method may further include:
s108: when the second switching instruction is detected, the third ac relay K5 is controlled to be turned off.
In the actual use process of the power supply system, the switching is usually needed when the alternating current power supply is abnormal, and at the moment, the third phase of the alternating current power supply can not provide electric energy, and the alternating current relay K5 can be disconnected at the same time, so that the circuit balance is maintained.
In one possible implementation, S106 may include:
s1061: when a second switching instruction is detected, the battery charging and discharging circuit 11 is controlled to supply power to the direct current buses according to a second preset output power until each direct current relay is detected to be closed;
wherein the second preset output power is greater than the rated output power of the battery charge-discharge circuit 11.
In the embodiment described above, the circuit allows short-time overload, so that when the battery charge/discharge circuit 11 is switched to the discharge state, the discharge power of the battery can be increased in a short time as well, the voltage of the dc bus can be increased within the allowable range of the circuit, the dropping speed of the dc bus can be further reduced, and the power supply of the load can be ensured.
In the same way, the second preset output power can be 1.5 times of the rated output power of the battery charge-discharge circuit 11, namely 75% of the total power demand can be provided, and at least 75% of the power output can be ensured in the processes of opening two alternating current relays and closing two direct current relays; if the alternating current power supply is normal at this time, the third alternating current relay K5 is closed, so that 108% of power output can be ensured, and normal power supply of the load can be ensured.
Specifically, the second preset power may also be set according to the actual application requirement, which is not limited herein.
In a possible implementation manner, after S107, the method may further include:
s109: acquiring load power and output power of a battery;
s1010: if the output power of the battery is not less than the load power, the third alternating current relay K5 is controlled to be disconnected;
s1011: if the output power of the battery is smaller than the load power, the third alternating current relay K5 is controlled to be closed, and the alternating current power supply supplies power to the direct current bus through the rectifying circuit 13.
After the switching is completed, if the output power of the battery is insufficient, the power can be supplied by the third phase of the non-multiplexed alternating current power supply.
In one possible embodiment, the method may further include:
s1012: when the voltage of the alternating current power supply is detected to be normal, a first switching instruction is generated;
s1013: when detecting that the voltage of the alternating current power supply is abnormal, a second switching instruction is generated.
In the normal use process of the power supply system, the alternating current power supply is relatively stable, so that the cost is low, and the alternating current power supply is preferential. When the alternating current power supply is normal, the alternating current power supply is used for supplying power preferentially; when the alternating current power supply is abnormal, the battery is used for supplying power.
When the power supply system is tested or maintained, the cut flower is needed, and the first switching instruction or the second switching instruction can be generated according to the user requirement, and the specific mode is not described herein.
Meanwhile, S1010-S1011 are processes of continuous detection, and continuously generate the first switching command when the ac power is normal. In practical application, since the switch state at the last moment is based on the first switching instruction, the first switching instruction is generated at the current moment to ensure that the states of the switches are unchanged.
For the power supply system shown in fig. 1, in one possible embodiment, the circuit structure of the rectifying circuit 13 and the ac/dc common circuit 12 may be the same.
The third phase of the ac power supply is not multiplexed and is therefore used only for rectification. However, to keep the circuit balance, the circuit structure of the rectifying circuit 13 may be the same as that of the ac/dc common circuit 12, so as to ensure the consistency of ac three phases and reduce the control difficulty.
Further, two dc relays may be provided between the battery charge/discharge circuit 11 and the battery to control the power supply path of the battery. Specifically, the two dc relays may be normally closed, and the battery charge/discharge circuit 11 is controlled for charging or discharging only by switching of the control logic.
In one possible embodiment, referring to fig. 3, the dc bus may include: positive and negative dc BUS-; the ac/dc common circuit 12 may include: the first inductor L1, the first diode D1, the second diode D2, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4;
the anode of the first diode D1 is respectively connected with the first end of the first inductor L1, the cathode of the second diode D2, the first end of the first switch tube Q1 and the first end of the third switch tube Q3, and the cathode of the first diode D1 is connected with the positive direct current BUS BUS+;
the second end of the first switching tube Q1 is respectively connected with the second end of the third switching tube Q3, the first end of the second switching tube Q2 and the first end of the fourth switching tube Q4;
the second end of the second switching tube Q2 and the second end of the fourth switching tube Q4 are grounded;
the second end of the first inductor L1 is connected with the input end of the AC/DC common circuit 12;
the anode of the second diode D2 is connected to the negative dc BUS.
Fig. 3 shows a schematic circuit diagram of an ac/dc common circuit 12. The control logic of the switching tube is switched to ensure that the switching tube can be used for rectifying an alternating current power supply and can also be used for voltage conversion of a battery. The specific circuit principles are not described in detail herein.
It should be noted that a positive BUS capacitor C1 and a negative BUS capacitor C2 are also provided between the positive dc BUS bus+ and the negative dc BUS-.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
The following are device embodiments of the application, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 4 is a schematic structural diagram of a switching device of a power supply system according to an embodiment of the present application, which is applied to the power supply system shown in fig. 1.
The power supply system includes: the battery charging and discharging circuit comprises a battery, an alternating current power supply, a battery charging and discharging circuit 11, two alternating current-direct current shared circuits 12, a rectifying circuit 13, two direct current relays and three alternating current relays;
the positive electrode and the negative electrode of the battery are respectively connected with a positive battery end and a negative battery end of the battery charging and discharging circuit 11, and the direct current end of the battery charging and discharging circuit 11 is connected with a direct current bus;
the input end of the first AC/DC common circuit 12 is connected with the positive electrode of the battery through a first DC relay K1 and is also connected with a first phase of an AC power supply through a first AC relay K3; the input end of the second AC/DC common circuit 12 is connected with the negative electrode of the battery through a second DC relay K2 and is also connected with a second phase of an AC power supply through a second AC relay K4; the output end of the first AC/DC sharing circuit 12 and the output end of the second AC/DC sharing circuit 12 are connected with a DC bus;
the input end of the rectifying circuit 13 is connected with a third phase of an alternating current power supply through a third alternating current relay K5, and the output end of the rectifying circuit 13 is connected with a direct current bus;
the battery and the alternating current power supply time-sharing multiplex the first alternating current-direct current shared circuit 12 and the second alternating current-direct current shared circuit 12 to supply power for the direct current bus;
the switching device includes:
the first switch control module 21 is configured to control the battery to supply power to the dc bus through the battery charging and discharging circuit 11, control the third ac relay K5 to be turned on, and control each dc relay to be turned off when the first switch command is detected;
a second switch control module 22, configured to control, when it is detected that each of the dc relays is turned off, the first ac relay K3 and the second ac relay K4 to be turned on;
the first switching command is used for instructing the ac/dc common circuit 12 to switch from battery power supply to ac power supply.
In one possible implementation, the first switch control module 21 may include:
the first overload control unit is used for controlling the battery charging and discharging circuit 11 to supply power to the direct current bus according to the first preset output power when the first switching instruction is detected until all the alternating current relays are detected to be closed;
wherein the first preset output power is greater than the rated output power of the battery charge-discharge circuit 11.
In one possible embodiment, the apparatus may further include:
the first power acquisition module is used for acquiring load power and output power of an alternating current power supply;
the first judging module is used for controlling the direct current bus to charge the battery through the battery charging and discharging circuit 11 if the output power of the alternating current power supply is not less than the load power;
and the second judging module is used for controlling the battery to supply power for the direct-current bus through the battery charging and discharging circuit 11 if the output power of the alternating-current power supply is smaller than the load power.
In one possible embodiment, the apparatus may further include:
the third switch control module is used for controlling the battery to supply power to the direct current bus through the battery charging and discharging circuit 11 and controlling the first alternating current relay K3 and the second alternating current relay K4 to be disconnected when the second switching instruction is detected;
the fourth switch control module is used for controlling each direct current relay to be closed when detecting that the first alternating current relay K3 and the second alternating current relay K4 are both opened;
the second switching instruction is used for instructing the ac/dc common circuit 12 to switch from ac power supply to battery power supply.
In one possible implementation, the third switch control module may include:
the second overload control unit is used for controlling the battery charging and discharging circuit 11 to supply power to the direct current bus according to a second preset output power when a second switching instruction is detected until each direct current relay is detected to be closed;
wherein the second preset output power is greater than the rated output power of the battery charge-discharge circuit 11.
In one possible embodiment, the apparatus may further include:
the second power acquisition module is used for acquiring load power and output power of the battery;
the third judging module is used for controlling the third alternating current relay K5 to be disconnected if the output power of the battery is not less than the load power;
and the fourth judging module is used for controlling the third alternating current relay K5 to be closed if the output power of the battery is smaller than the load power, and the alternating current power supply supplies power to the direct current bus through the rectifying circuit 13.
In one possible embodiment, the apparatus may further include:
and the fifth switch control module is used for controlling the third alternating current relay K5 to be disconnected when the second switching instruction is detected.
In one possible embodiment, the apparatus may further include:
the first instruction generation module is used for generating a first switching instruction when detecting that the voltage of the alternating current power supply is normal;
and the second instruction generation module is used for generating a second switching instruction when detecting the voltage abnormality of the alternating current power supply.
Fig. 5 is a schematic diagram of a handover terminal according to an embodiment of the present application. As shown in fig. 5, the switching terminal 3 of this embodiment includes: a processor 30 and a memory 31. The memory 31 is used for storing the computer program 32, and the processor 30 is used for calling and running the computer program 32 stored in the memory 31 to perform the steps in the above-described embodiments of the switching method of the respective power supply systems, such as steps S101 to S102 shown in fig. 2. Alternatively, the processor 30 is configured to invoke and run the computer program 32 stored in the memory 31 to implement the functions of the modules/units in the above-described device embodiments, such as the functions of the modules 21 to 22 shown in fig. 4.
By way of example, the computer program 32 may be partitioned into one or more modules/units that are stored in the memory 31 and executed by the processor 30 to complete the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing a specific function for describing the execution of the computer program 32 in the handover terminal 3. For example, the computer program 32 may be split into modules/units 21 to 22 shown in fig. 4.
The switch terminal 3 may be a computing device such as a desktop computer, a notebook computer, a palm computer, and a cloud server. The handover terminal 3 may include, but is not limited to, a processor 30, a memory 31. It will be appreciated by those skilled in the art that fig. 5 is merely an example of a switch terminal 3 and does not constitute a limitation of the switch terminal 3, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the terminal may further include an input-output device, a network access device, a bus, etc.
The processor 30 may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 31 may be an internal storage unit of the switch terminal 3, for example a hard disk or a memory of the switch terminal 3. The memory 31 may be an external storage device of the switch terminal 3, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the switch terminal 3. Further, the memory 31 may also include both an internal storage unit and an external storage device of the switch terminal 3. The memory 31 is used to store computer programs and other programs and data required by the terminal. The memory 31 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the apparatus/terminal embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A switching method of a power supply system is characterized in that the power supply system is applied; the power supply system includes: the device comprises a battery, an alternating current power supply, a battery charging and discharging circuit, two alternating current-direct current sharing circuits, a rectifying circuit, two direct current relays and three alternating current relays;
the positive electrode and the negative electrode of the battery are respectively connected with a positive battery end and a negative battery end of the battery charging and discharging circuit, and the direct current end of the battery charging and discharging circuit is connected with a direct current bus;
the input end of the first AC/DC shared circuit is connected with the positive electrode of the battery through a first DC relay and is also connected with a first phase of the AC power supply through the first AC relay; the input end of the second AC/DC sharing circuit is connected with the negative electrode of the battery through a second DC relay and is also connected with a second phase of the AC power supply through a second AC relay; the output end of the first AC/DC shared circuit and the output end of the second AC/DC shared circuit are connected with the DC bus;
the input end of the rectifying circuit is connected with a third phase of the alternating current power supply through a third alternating current relay, and the output end of the rectifying circuit is connected with the direct current bus;
the battery and the alternating current power supply time-sharing multiplex the first alternating current-direct current shared circuit and the second alternating current-direct current shared circuit to supply power for the direct current bus;
the switching method comprises the following steps:
when a first switching instruction is detected, controlling the battery to supply power to the direct current bus through the battery charging and discharging circuit, controlling the third alternating current relay to be closed, and controlling each direct current relay to be opened;
when each direct current relay is detected to be opened, controlling the first alternating current relay and the second alternating current relay to be closed;
the first switching instruction is used for indicating the AC/DC shared circuit to be switched from the battery power supply to the AC power supply.
2. The switching method of the power supply system according to claim 1, wherein when the first switching instruction is detected, controlling the battery to supply power to the dc bus through the battery charge-discharge circuit includes:
when the first switching instruction is detected, the battery charging and discharging circuit is controlled to supply power to the direct current bus according to a first preset output power until all the alternating current relays are detected to be closed;
the first preset output power is larger than the rated output power of the battery charging and discharging circuit.
3. The switching method of a power supply system according to claim 1, wherein after controlling both of the first ac relay and the second ac relay to be closed when each of the dc relays is detected to be open, the method further comprises:
acquiring load power and output power of the alternating current power supply;
if the output power of the alternating current power supply is not smaller than the load power, the direct current bus is controlled to charge the battery through the battery charging and discharging circuit;
and if the output power of the alternating current power supply is smaller than the load power, controlling the battery to supply power for the direct current bus through the battery charging and discharging circuit.
4. A method of switching a power supply system according to any one of claims 1 to 3, further comprising:
when a second switching instruction is detected, controlling the battery to supply power to the direct current bus through the battery charging and discharging circuit, and controlling the first alternating current relay and the second alternating current relay to be disconnected;
when the first alternating current relay and the second alternating current relay are detected to be opened, controlling each direct current relay to be closed;
the second switching instruction is used for indicating the AC/DC shared circuit to switch from the AC power supply to the battery power supply.
5. The method according to claim 4, wherein when the second switching instruction is detected, controlling the battery to supply power to the dc bus through the battery charge-discharge circuit comprises:
when the second switching instruction is detected, the battery charging and discharging circuit is controlled to supply power to the direct current bus according to a second preset output power until each direct current relay is detected to be closed;
the second preset output power is larger than the rated output power of the battery charging and discharging circuit.
6. The switching method of a power supply system according to claim 4, wherein after said controlling each of the dc relays to be closed when said first ac relay and said second ac relay are both detected to be open, said method further comprises:
acquiring load power and output power of the battery;
if the output power of the battery is not less than the load power, the third alternating current relay is controlled to be disconnected;
and if the output power of the battery is smaller than the load power, controlling the third alternating current relay to be closed, and supplying power to the direct current bus by the alternating current power supply through the rectifying circuit.
7. The method of switching a power supply system according to claim 4, further comprising:
and when the second switching instruction is detected, controlling the third alternating current relay to be disconnected.
8. The method of switching a power supply system according to claim 4, further comprising:
when the voltage of the alternating current power supply is detected to be normal, generating the first switching instruction;
and generating the second switching instruction when the voltage abnormality of the alternating current power supply is detected.
9. A switching method of a power supply system according to any one of claims 1 to 3, wherein the dc bus includes: a positive DC bus and a negative DC bus; the AC/DC sharing circuit comprises: the first inductor, the first diode, the second diode, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube;
the anode of the first diode is respectively connected with the first end of the first inductor, the cathode of the second diode, the first end of the first switch tube and the first end of the third switch tube, and the cathode of the first diode is connected with the positive direct current bus;
the second end of the first switching tube is respectively connected with the second end of the third switching tube, the first end of the second switching tube and the first end of the fourth switching tube;
the second end of the second switching tube and the second end of the fourth switching tube are grounded;
the second end of the first inductor is connected with the input end of the alternating current-direct current shared circuit;
and the anode of the second diode is connected with the negative direct current bus.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the switching method of the power supply system according to any one of the preceding claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310802828.8A CN116760170A (en) | 2023-07-03 | 2023-07-03 | Switching method of power supply system and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310802828.8A CN116760170A (en) | 2023-07-03 | 2023-07-03 | Switching method of power supply system and storage medium |
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| CN202310802828.8A Pending CN116760170A (en) | 2023-07-03 | 2023-07-03 | Switching method of power supply system and storage medium |
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| Country | Link |
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| CN (1) | CN116760170A (en) |
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