CN113258661A - Alternating current parallel operation system and method of bidirectional charging and discharging portable energy storage device - Google Patents
Alternating current parallel operation system and method of bidirectional charging and discharging portable energy storage device Download PDFInfo
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- CN113258661A CN113258661A CN202110581600.1A CN202110581600A CN113258661A CN 113258661 A CN113258661 A CN 113258661A CN 202110581600 A CN202110581600 A CN 202110581600A CN 113258661 A CN113258661 A CN 113258661A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/0068—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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
Abstract
The invention discloses an alternating current parallel operation system and method of a bidirectional charge-discharge portable energy storage device, belonging to the field of charge-discharge power supply system management, comprising at least two portable energy storage devices, wherein a discharge port of a slave computer is connected with a charge port of a host computer, and a sampling module of the host computer is used for collecting current or/and voltage information of the charge port of the host computer; the control module of the host is used for controlling the battery of the host to output the current and the voltage which are the same as those of the slave to a discharge port of the host; the current output from the slave discharge port is superposed with the current output from the host discharge port and then output to an external load from the host discharge port; compared with the prior art, the invention can support the bidirectional charge and discharge function, and simultaneously eliminates the AC output performance difference caused by the performance error of each device by utilizing the sampling module, thereby realizing the accurate control of power distribution, effectively reducing the reactive circulation current between parallel machines and improving the reliability of the parallel machines.
Description
Technical Field
The invention belongs to the field of charge-discharge power supply system management, and particularly relates to an alternating current parallel operation system and method of a bidirectional charge-discharge portable energy storage device.
Background
The portable energy storage device is a device commonly used in the process of camping and outing, is used for supplying power to equipment such as an induction cooker, an electric oven and the like, and is popular with foreign camping enthusiasts; however, when the output power of the portable energy storage device is smaller than the rated power of the electric equipment, a plurality of portable energy storage devices need to be connected in parallel; the output high power supplies energy for electric equipment.
The existing parallel connection technology is applied to a unidirectional inverse power supply, a bundle of communication lines and a PWM (pulse-width modulation) drive control module connected with two machine power conversion electronic switches are indirectly connected into two unidirectional inverse power supplies with the same type, when the two power supplies execute alternating current parallel connection, one power supply drive control module does not send a control signal, and the two power supplies share the drive of one unidirectional inverse power supply to realize the superposition of the output power of the two power supplies; however, this solution has some drawbacks:
1. when the SOC of the batteries of the two power supplies has large difference, the batteries can not work normally;
2. errors naturally exist in the performance of the two machines, and the difference also exists in the inversion output of the two machines, so that larger circulation current exists between the two machines, and the power imbalance and the working reliability of the two machines during parallel operation output are influenced;
3. under the condition that the output does not exceed the maximum output power of a single unit, when one of the units is abnormal, the other unit can not output normally, so that the two units can not supply power to the load;
4. the AC parallel machine discharging of the machine with the charging and discharging bidirectional conversion function is not supported.
Disclosure of Invention
Aiming at the defects in the technology, the invention provides the alternating current parallel operation system and the alternating current parallel operation method of the bidirectional charging and discharging portable energy storage device, which support the bidirectional charging and discharging function, can automatically identify whether the power supply of the charging socket end is the parallel operation machine power supply or the power grid access power supply, and can intelligently select whether the parallel operation function or the charging function is started according to the identification result.
In order to achieve the above object, the present invention provides an ac parallel operation system for bidirectional charging and discharging portable energy storage devices, comprising at least two portable energy storage devices, each portable energy storage device comprising a control module, a sampling module, a bidirectional charging and discharging module, a charging port and a discharging port connected to the bidirectional charging and discharging module; the discharge port of at least one portable energy storage device is used for being connected with an external load; the portable energy storage device with the discharging port connected with the load is a host, the other portable energy storage device is a slave, and the discharging port of the slave is connected with the charging port of the host;
the sampling module of the host is used for collecting current or/and voltage information of the host charging port;
the control module of the host machine is used for controlling the bidirectional charging and discharging module of the host machine to output the same voltage as that of the slave machine to the discharging port of the host machine; the current output from the slave discharge port and the current output from the host discharge port are superposed and then output to an external load from the host discharge port.
According to the specific scheme, the host and the slave comprise batteries, the batteries are electrically connected with a bidirectional charging and discharging module, and the bidirectional charging and discharging module is used for converting direct current output by the batteries into alternating current and outputting the alternating current to a discharging port; and the sampling module of the host is used for acquiring phase, frequency and amplitude information of current or/and voltage output by the host charging port and the bidirectional charging and discharging module.
The bidirectional charge-discharge module is used for converting direct current input by the battery into alternating current and outputting the alternating current to the discharge port, or the bidirectional charge-discharge module is used for converting alternating current input by the charge port into direct current and outputting the direct current to the battery to charge the battery.
According to the specific scheme, the charging ports of the host and the slave comprise a charging zero line and a charging live line, and the discharging ports comprise a discharging zero line and a discharging live line; the charging zero line is connected with the discharging zero line, and the charging live wire is connected with the discharging live wire; the connection point of the charging zero line and the discharging zero line is connected with the zero line at the output end of the bidirectional charging and discharging module, and the connection point of the charging live line and the discharging live line is connected with the live line at the output end of the bidirectional charging and discharging module.
According to the specific scheme, a first on-off switch is arranged between a charging zero line and a discharging zero line or/and between a charging live line and a discharging live line; a second on-off switch is arranged between the discharging electric wire or/and the discharging zero line and the load; when the sampling module of the host machine collects current or/and voltage information of the charging port of the host machine, the control module controls the second on-off switch of the slave machine to be switched on, and the first on-off switch of the host machine is switched off.
According to the specific scheme, when the sampling module of the host acquires current or/and voltage information of the host charging port, the acquired current or/and voltage information is compared with preset standard current or/and voltage information, and a current or/and voltage source accessed to the host charging port is judged.
According to the specific scheme, when the control module of the host controls the bidirectional charging and discharging module of the host to output the same voltage as that of the slave to the discharging port of the host, the control module firstly controls the second on-off switch of the slave to be closed, the first on-off switch of the host is closed, and the second on-off switch of the host is opened, so that a no-load parallel operation state is formed; and then a second on-off switch of the main machine is controlled to be closed to form the loaded parallel operation.
According to the specific scheme, the slave machine or/and the host machine are/is provided with a parallel operation starting module, after the parallel operation starting module works, the control module controls a second on-off switch of the slave machine to be closed and controls a discharging port to output an electric signal different from an alternating current power grid within fixed time.
The specific scheme includes that the power control system further comprises a power sampling module, the current sampling module acquires battery power information of the host and the slave, when the battery power of the host and the slave does not exceed a preset threshold value of the power sampling module, the host and the slave output the same power, and when the battery power of the host and the slave exceeds the preset threshold value of the power sampling module, output power values of corresponding ratios of discharging ports of the host and the slave are controlled according to the power ratio of the batteries.
The specific scheme comprises a plurality of portable energy storage devices, wherein after the plurality of portable energy storage devices are connected in series, a discharge port of one portable energy storage device is connected with a charge port of a slave; wherein the plurality of portable energy storage devices are connected in series: the discharging port of the former portable energy storage device is connected with the charging port of the latter portable energy storage device.
In order to achieve the above object, the present invention further provides an ac parallel operation method for bidirectional charging and discharging portable energy storage devices, which is characterized in that the method is performed by the ac parallel operation system for bidirectional charging and discharging portable energy storage devices according to any one of claims 1 to 8; the method comprises the following steps:
s1, the charging port of the host computer is electrically communicated with the discharging port of the slave computer, so that the host computer and the slave computer form circulation; a sampling module of the host machine acquires current or/and voltage information of a charging port of the host machine;
s2, the control module of the host controls the battery of the host to output the same current and voltage as the slave to the discharge port of the host; the current output from the slave discharge port and the current output from the host discharge port are superposed and then output to an external load from the host discharge port.
The invention has the beneficial effects that: the invention provides an alternating current parallel operation system of a bidirectional charge-discharge portable energy storage device, which comprises at least two portable energy storage devices, wherein each portable energy storage device comprises a control module, a sampling module, a bidirectional charge-discharge module, a charge port and a discharge port, wherein the charge port and the discharge port are connected with the bidirectional charge-discharge module; the discharge port of at least one portable energy storage device is used for being connected with an external load; the portable energy storage device with the discharging port connected with the load is a host, the other portable energy storage device is a slave, and the discharging port of the slave is connected with the charging port of the host;
the sampling module of the host is used for collecting current or/and voltage information of the host charging port;
the control module of the host is used for controlling the battery of the host to output the current and the voltage which are the same as those of the slave to a discharge port of the host; the current output from the slave discharge port is superposed with the current output from the host discharge port and then output to an external load from the host discharge port; compared with the prior art:
1. the system supports the bidirectional charging and discharging function, can automatically identify whether the power supply of the charging socket end is the power supply of a parallel machine or the power grid access power supply, and can intelligently select whether to start the parallel machine function or the charging function according to the identification result;
2. the sampling module and the control module are used for detecting and controlling closed loops formed by the host charging port and the slave discharging port, and self-checking and checking are carried out on the host and the slave, so that alternating current output performance difference caused by performance errors of respective devices is eliminated, accurate control on power distribution is realized, reactive circulation between parallel machines can be effectively reduced, and parallel machine reliability is improved.
Drawings
FIG. 1 is a prior art circuit diagram;
FIG. 2 is a circuit diagram of the system of the present invention;
FIG. 3 is a diagram showing the relationship between the modules of the system of the present invention.
The main element symbols are as follows:
#1, host; #2, slave; 1. a battery; 2. a bidirectional charge and discharge module; 3. a control module; 4. a sampling module; 5. and (4) loading.
Detailed Description
In order to more clearly describe the present invention, the present invention will be further described with reference to the accompanying drawings.
The parallel operation scheme is mainly applied to camping processes, for example, the maximum power of a single portable energy storage device is only 120W, and the rated power of electric equipment is 220W, such as a microwave oven; at the moment, the power of a single portable energy storage device cannot drive the microwave oven to work, so that two or more portable energy storage devices are required to be connected together in parallel, and the power of the plurality of portable energy storage devices is superposed to supply power to electric equipment; referring to fig. 1, because the electric device needs an ac power supply, the current output by the portable energy storage device must be ac, and when the ac power is parallel, it must be ensured that the phase, frequency and amplitude of the current are the same, so that the output power values of the plurality of portable energy storage devices are superimposed and stably output; as described in the background art, in the prior art, after two unidirectional inverter power supplies of the same type are connected, a single PWM driving control module 3 is used to simultaneously control the output of the two power supplies, so as to realize the superposition of the output power of the two power supplies; however, this solution has some drawbacks: firstly, because the performance of two machine elements can have errors naturally, the inversion outputs of the two machines can have differences, so that a large circulation current can exist between the two machines, and the power imbalance and the working reliability of the two machines during parallel operation output are influenced; secondly, the scheme does not support the alternating current parallel machine discharging of the machine with the charge-discharge bidirectional conversion function.
The invention provides an alternating current parallel operation system of a bidirectional charge and discharge portable energy storage device, please refer to fig. 2 and fig. 3, which includes at least two portable energy storage devices, each portable energy storage device includes a control module 3, a sampling module 4, a bidirectional charge and discharge module 2, a charge port and a discharge port connected with the bidirectional charge and discharge module 2; the discharge port of at least one portable energy storage device is used for connecting with an external load 5; the portable energy storage device with the discharging port connected with the load 5 is a host #1, the other portable energy storage device is a slave #2, and the discharging port of the slave #2 is connected with the charging port of the host # 1;
the sampling module 4 of the host #1 is used for collecting current or/and voltage information of a charging port of the host # 1;
the control module 3 of the host #1 controls the battery 1 of the host #1 to output the current and the voltage which are the same as those of the slave #2 to a discharge port of the host #1 according to the current or/and voltage information of the charge port of the host #1, which is acquired by the sampling module 4; the slave #2 discharge port output current and the master #1 discharge port current are superimposed and then output from the master #1 discharge port to the external load 5.
Compared with the prior art, the power supply system supports the bidirectional charge and discharge function, can automatically identify whether the power supply of the charging socket end is the parallel operation machine power supply or the power grid access power supply, and can intelligently select whether to start the parallel operation function or the charging function according to the identification result; meanwhile, the sampling module 4 and the control module 3 are used for detecting and controlling the closed loop formed by the charging port of the host machine #1 and the discharging port of the slave machine #2, self-checking and verifying are carried out on the host machine #1 and the slave machine #2, and the alternating current output performance difference caused by the performance error of respective devices is eliminated, so that accurate control over power distribution is realized, reactive circulation between parallel machines can be effectively reduced, and the parallel machine reliability is improved.
In the embodiment, the master #1 and the slave #2 are both provided with the battery 1, and the bidirectional charge-discharge module 2 is used for converting direct current output by the battery 1 into alternating current and outputting the alternating current to a discharge port for use by external electric equipment; the sampling module 4 of the host #1 is used for collecting phase, frequency and amplitude information of current or/and voltage of the charging port of the host #1 and the bidirectional charging and discharging module 2; for example, the phase of the collected charging port voltage is positive within the time t0-t1, the current phase is negative within the time t1-t2, the frequency is 50HZ, and the amplitude is 170V; adjusting the output voltage of the bidirectional charging and discharging module 2 according to the collected charging port voltage; the output voltage of the bidirectional charge and discharge module 2 is made to be the same as the discharge voltage of the discharge port of the slave # 2.
In this embodiment, the slave #2 or/and the master #1 is/are provided with a parallel start module, and the start module can start to work after receiving an external start button; before the charging port of the master machine #1 and the discharging port of the slave machine #2 are connected through a standard charging power line; the start key can be selected to be pressed to enter a parallel connection mode, at the moment, the sampling module 4 of the host #1 firstly collects the output current or/and voltage information of the slave #2, and then the battery 1 of the host #1 is controlled by the control module 3 to output the current and voltage which are the same as those of the slave #2 to a discharge port of the host # 1; the slave #2 discharge port output current and the master #1 discharge port current are superimposed and then output from the master #1 discharge port to the external load 5.
In the embodiment, the output current is firstly acquired and then controlled by the control module 3, so that the alternating current output performance difference caused by the performance error of each device is eliminated, the accurate control of power distribution is realized, the reactive circulation current between parallel machines can be effectively reduced, and the parallel machine reliability is improved.
In this embodiment, the master #1 and the slave #2 are connected in parallel by using a standard charging power line, and a dedicated ac connection and a dedicated communication connection harness do not need to be customized.
In this embodiment, after the start module starts to operate, the slave #2 discharge port outputs an electrical signal different from the ac power grid for a fixed time.
In this embodiment, the start button may be replaced by a mobile terminal APP to send an instruction to the control module 3 to control start and parallel operation.
In this embodiment, the bidirectional charge-discharge module 2 is a bidirectional charge-discharge module having a bidirectional charge-discharge function; when the parallel connection mode is not started, and the discharge port of the slave #2 is connected with the charge port of the host #1, the slave #2 can charge the battery of the host # through the bidirectional charge-discharge module with the bidirectional charge-discharge function; after entering the parallel connection mode, the bidirectional charge-discharge module with the bidirectional charge-discharge function of the host #1 outputs the same voltage as the charge port of the host # 1.
In the preferred scheme, when the sampling module 4 of the host #1 acquires the current or/and voltage information of the charging port of the host #1, the acquired current or/and voltage information is compared with the preset standard current or/and voltage information, and if the comparison result is consistent, the charging port of the host #1 is judged to be connected with an external power grid; if the comparison result is inconsistent, judging that the charging port of the host #1 is connected with the discharging port of the slave # 2; because the charging terminal of the master #1 may be connected to the external grid in addition to the slave # 2; therefore, the input current and voltage of the charging port need to be judged; for example, the discharge end of the slave #2 outputs at least 1 second of low-voltage safe and stable alternating current defined by safety regulations when the slave is started, so that the charging port is identified as non-alternating current power grid access; when the host #1 is accessed by an external power grid, the charging mode is entered.
In this embodiment, the slave #2 and the master #1 have the same internal module, and when the charging port of the slave #2 is connected to the external grid and the discharging port of the slave #2 is connected to the master #1, the slave #2 enters the charging mode.
In this embodiment, the data information collected by the sampling module 4 may be transmitted to the control module 3 in a wired transmission manner, or may be transmitted to the control module 3 in a wireless communication manner.
In this embodiment, the charging ports of the master #1 and the slave #2 both include a charging zero line and a charging live line, and the discharging ports both include a discharging zero line and a discharging live line; the charging zero line is connected with the discharging zero line, and the charging live wire is connected with the discharging live wire; the connection point of the charging zero line and the discharging zero line is connected with the negative output end of the bidirectional charging and discharging module 2, and the connection point of the charging live line and the discharging live line is connected with the positive output end of the bidirectional charging and discharging module 2.
Referring to fig. 1, a switch SW1-1 is arranged between a charging zero line and a discharging zero line of a host #1, a switch SW1-2 is arranged between a charging live line and a discharging live line, and a switch SW1-3 is arranged between the discharging live line and a load 5; a switch SW2-1 is arranged between the charging zero line and the discharging zero line of the slave #2, a switch SW2-2 is arranged between the charging live line and the discharging live line, and a switch SW2-3 is arranged between the discharging live line and the load 5; the sampling module 4 of the host #1 is directly connected to the charging port of the host # 1.
In the present embodiment, when the sampling module 4 recognizes that the ac charging port is connected to the slave #2 instead of the power supply of the grid, the switch SW1-3 of the master #1 is turned off; the control module 3 of the slave #2 controls the switch SW2-3 of the slave #2 to be turned off.
In this embodiment, when the sampling module 4 of the master #1 collects the current or/and voltage information of the charging port of the master #1, the control module 3 of the slave #2 controls the switch SW2-3 of the slave #2 to be turned off, and the control module 3 of the master #1 controls the switches SW1-1 and SW1-2 of the master #1 to be turned off.
In this embodiment, when the control module 3 of the master #1 controls the battery 1 of the master #1 to output the same current and voltage as those of the slave #2 to the discharge port of the master #1, the control module 3 first controls the switch SW2-3 of the slave #2 to be turned off, the switches SW1-1 and SW1-2 of the master #1 to be turned off, and the switch SW1-3 of the master #1 is turned off, so as to form an idle parallel operation state; after the unloaded parallel operation is finished, the switch SW1-3 of the main machine #1 is controlled to be closed again, and the loaded parallel operation is formed.
In this embodiment, the electronic control switch of the present invention may use a circuit composed of a relay, a contactor, a MOSFET, an IGBT, a triode, a thyristor, a photoelectric switch or corresponding electronic components, and it also belongs to the protection scope of this patent if a combination of a mechanical switch and an electronic switch such as the above-mentioned one is used.
Preferably, the power control system further comprises a power sampling module 4, the current sampling module 4 acquires power information of the batteries 1 of the master #1 and the slave #2, when the power of the batteries 1 of the master #1 and the slave #2 does not exceed a predetermined threshold of the power sampling module 4, the master #1 and the slave #2 output power with the same power, and when the power of the batteries 1 of the master #1 and the slave #2 exceeds the predetermined threshold of the power sampling module 4, the output power values of the corresponding ratio of the discharging ports of the master #1 and the slave #2 are controlled according to the power ratio of the batteries 1.
For example: when the SOC difference of the batteries 1 of the host machine #1 and the slave machine #2 is not more than 5 percent, and the rated power of the electric equipment is 220W, controlling the output power of the host machine #1 and the output power of the slave machine #2 to be 110W; to supply power to the electrical equipment.
Another example is: when the SOC difference of the battery 1 of the master #1 and the slave #2 exceeds 5%, the master #1 and the slave #2 can be continuously controlled to output 110W power to supply power to the electric equipment, but the electric equipment with smaller electric quantity is discharged first due to the electric quantity difference of the battery 1, and at this time, the master #1 and the slave #2 cannot continuously supply power to the electric equipment.
Another example is: when the SOC difference of the batteries 1 of the master machine #1 and the slave machine #2 exceeds 5 percent, and the electric quantity ratio of the batteries 1 of the master machine #1 and the slave machine #2 is 3:1, the output power of the master machine #1 can be controlled to be 165W, and the output power of the slave machine #2 can be controlled to be 55W; the master machine #1 and the slave machine #2 can be discharged at the same time; the total discharge time of this scheme is longer than the last master #1 and slave #2 both power discharged.
Compared with the prior art, the scheme of the invention can support parallel operation discharging of two or more portable energy storage devices with different power levels and different battery 1SOC, the discharging output power of each single machine can be average power, and the normalized power can be calculated according to the rated power capacity of each machine, the battery 1SOC and the weighting ratio coefficient in the parallel operation system to output corresponding power.
The preferred scheme further comprises a plurality of portable energy storage devices, wherein after the plurality of portable energy storage devices are connected in series, a discharge port of one portable energy storage device is connected with a charge port of the slave # 2; wherein the plurality of portable energy storage devices are connected in series: the discharging port of the previous portable energy storage device is connected with the charging port of the next portable energy storage device; the power of the plurality of portable energy storage devices is sequentially superposed to supply energy to the load 5; for example, 5 portable energy storage devices with output power of 50W are connected in series in sequence to supply power to electric equipment with rated power of 220W.
The invention has the advantages that:
1. the power supply system supports the bidirectional charging and discharging function, can automatically identify whether the power supply of the charging socket end is the power supply of a parallel machine or the power grid access power supply, and can intelligently select whether to start the parallel machine function or the charging function according to the identification result.
2. The sampling module and the control module are used for detecting and controlling closed loops formed by the host charging port and the slave discharging port, and self-checking and checking are carried out on the host and the slave, so that alternating current output performance difference caused by performance errors of respective devices is eliminated, accurate control on power distribution is realized, reactive circulation between parallel machines can be effectively reduced, and parallel machine reliability is improved.
4. The scheme of the invention supports parallel discharge of two or more than two portable energy storage devices with different power grades and different battery SOC.
5. The host machine and the slave machine are connected in parallel by using a standard charging power line, and special alternating current connection and communication connection wiring harnesses do not need to be customized additionally.
It should be noted that, if the bidirectional charging and discharging module in the solution of the present invention is replaced by the unidirectional inversion module, and the charging port and the discharging port are replaced by two or more discharging ports with electronic switches for controlling the mutual connection state, the parallel operation technology of the present invention can also be used to implement the ac parallel operation function, and thus, the present invention also belongs to the protection scope of the present invention.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (10)
1. An alternating current parallel operation system of a bidirectional charging and discharging portable energy storage device comprises at least two portable energy storage devices, and is characterized in that each portable energy storage device comprises a control module, a sampling module, a bidirectional charging and discharging module, a charging port and a discharging port, wherein the charging port and the discharging port are connected with the bidirectional charging and discharging module; the discharge port of at least one portable energy storage device is used for being connected with an external load; the portable energy storage device with the discharging port connected with the load is a host, the other portable energy storage device is a slave, and the discharging port of the slave is connected with the charging port of the host;
the sampling module of the host is used for collecting current or/and voltage information of the host charging port;
the control module of the host machine is used for controlling the bidirectional charging and discharging module of the host machine to output the same voltage as the discharging port of the slave machine to the discharging port of the host machine; the current output from the slave discharge port and the current output from the host discharge port are superposed and then output to an external load from the host discharge port.
2. The alternating current parallel operation system of the bidirectional charging and discharging portable energy storage device according to claim 1, wherein the master machine and the slave machine each comprise a battery, the battery is electrically connected with the bidirectional charging and discharging module, and the bidirectional charging and discharging module is used for converting direct current output by the battery into alternating current and outputting the alternating current to the discharging port; and the sampling module of the host is used for acquiring phase, frequency and amplitude information of current or/and voltage output by the host charging port and the bidirectional charging and discharging module.
3. The alternating current parallel operation system of the portable energy storage device with bidirectional charge and discharge of claim 1, wherein the charging ports of the master machine and the slave machine comprise a charging zero line and a charging live line, and the discharging ports comprise a discharging zero line and a discharging live line; the charging zero line is connected with the discharging zero line, and the charging live wire is connected with the discharging live wire; the connection point of the charging zero line and the discharging zero line is connected with the zero line at the output end of the bidirectional charging and discharging module, and the connection point of the charging live line and the discharging live line is connected with the live line at the output end of the bidirectional charging and discharging module.
4. The alternating current parallel operation system of the portable energy storage device with bidirectional charge and discharge of claim 4, wherein a first on-off switch is arranged between the charging zero line and the discharging zero line or/and between the charging live line and the discharging live line; a second on-off switch is arranged between the discharging electric wire or/and the discharging zero line and the load; when the sampling module of the host machine collects current or/and voltage information of the charging port of the host machine, the control module controls the second on-off switch of the slave machine to be switched on, and the first on-off switch of the host machine is switched off.
5. The alternating current parallel operation system of the bidirectional charging and discharging portable energy storage device according to claim 4, wherein when the sampling module of the host machine acquires the current or/and voltage information of the charging port of the host machine, the acquired current or/and voltage information is compared with the preset standard current or/and voltage information to judge the source of the current or/and voltage accessed to the charging port of the host machine.
6. The alternating current parallel operation system of the bidirectional charging and discharging portable energy storage device according to claim 4, wherein when the control module of the master machine controls the bidirectional charging and discharging module of the master machine to output the same voltage as that of the slave machine to the discharge port of the master machine, the control module of the slave machine firstly controls the second on-off switch of the slave machine to be closed, the control module of the master machine controls the first on-off switch of the master machine to be closed, and the second on-off switch of the master machine is opened, so that an idle parallel operation state is formed; and after the idle parallel operation state is entered, a second on-off switch of the main machine is controlled to be closed, so that the loaded parallel operation is formed.
7. The alternating current parallel operation system of the bidirectional charging and discharging portable energy storage device is characterized in that the slave machine or/and the master machine is/are provided with a parallel operation starting module, after the parallel operation starting module works, the control module of the slave machine controls the second on-off switch of the slave machine to be closed and controls the discharging port to output an electric signal different from an alternating current power grid within a fixed time.
8. The alternating current parallel operation system of the bidirectional charge-discharge portable energy storage device according to claim 2, further comprising an electric quantity sampling module, wherein the electric quantity sampling module acquires battery electric quantity information of the master machine and the slave machine, when the battery electric quantities of the master machine and the slave machine do not exceed a predetermined threshold value of the electric quantity sampling module, the master machine and the slave machine output the same power, and when the battery electric quantities of the master machine and the slave machine exceed the predetermined threshold value of the electric quantity sampling module, the output power value of the corresponding ratio of the discharge ports of the master machine and the slave machine is controlled according to the electric quantity ratio of the battery.
9. The alternating current parallel operation system of the portable energy storage devices capable of being charged and discharged bidirectionally according to any one of claims 1 to 8, further comprising a plurality of portable energy storage devices, wherein after the plurality of portable energy storage devices are connected in series, a discharging port of one portable energy storage device is connected with a charging port of a slave; wherein, the concatenation of many portable energy memory means: the discharging port of the former portable energy storage device is connected with the charging port of the latter portable energy storage device.
10. An ac parallel operation method for a bidirectional charging and discharging portable energy storage device, which is characterized in that the method is executed by the ac parallel operation system for the bidirectional charging and discharging portable energy storage device according to any one of claims 1 to 8; the method comprises the following steps:
s1, the charging port of the host computer is electrically communicated with the discharging port of the slave computer, so that the host computer and the slave computer form circulation; a sampling module of the host machine acquires current or/and voltage information of a charging port of the host machine;
s2, the control module of the host controls the battery of the host to output the same current and voltage as the slave to the discharge port of the host; the current output from the slave discharge port and the current output from the host discharge port are superposed and then output to an external load from the host discharge port.
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| CN202110581600.1A CN113258661B (en) | 2021-05-27 | 2021-05-27 | Alternating current parallel operation system and method of bidirectional charging and discharging portable energy storage device |
| PCT/CN2021/116104 WO2022247042A1 (en) | 2021-05-27 | 2021-09-02 | Alternating current parallel connection system and method for bidirectional charging and discharging portable energy storage apparatus |
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| CN202110581600.1A CN113258661B (en) | 2021-05-27 | 2021-05-27 | Alternating current parallel operation system and method of bidirectional charging and discharging portable energy storage device |
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| WO2022247042A1 (en) * | 2021-05-27 | 2022-12-01 | 深圳赛迪福德技术有限公司 | Alternating current parallel connection system and method for bidirectional charging and discharging portable energy storage apparatus |
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