Direct-current bus power supply method and circuit based on parallel direct-current power supply

Abstract

The invention relates to the technical field of direct-current power supply, and particularly provides a direct-current bus power supply method and circuit based on a parallel direct-current power supply, and the method comprises the steps: enabling an alternating-current power supply to be rectified into a direct-current power supply when the alternating-current power supply is normal, and supplying power to a direct-current bus, a first storage battery and a second storage battery; when the alternating current power supply is abnormal, the second storage battery supplies power to the direct current bus, and the first storage battery supplies power to the direct current bus until the electric quantity of the second storage battery is completely released; when a check capacity test is carried out, the second storage battery is discharged to the direct current bus for testing, and after the test is finished, the first storage battery is discharged to the direct current bus for testing and the first storage battery supplies power to the second storage battery; the capacity of the first storage battery is larger than that of the second storage battery, the first storage battery and the second storage battery form a storage battery pack, and the multiple storage battery packs are connected between the positive electrode and the negative electrode of the direct-current bus in parallel. According to the invention, on-line check capacity testing can be carried out, the power supply safety is high, and the circulating current is small.

Description

Technical Field

[0001] The invention relates to the technical field of direct current power supply, and in particular to a direct current bus power supply method and circuit based on parallel direct current power supplies. Background Art

[0002] The DC bus is a key component of the power system. Continuously providing it with DC power can ensure the stable operation of the system without being affected by external power fluctuations. Therefore, the DC bus needs to be equipped with a battery as a backup DC power supply.

[0003] When multiple batteries are connected in series between the positive and negative poles of the DC bus, as long as one of the batteries has an open circuit or a reduced discharge capacity, it will be unable to supply power to the DC bus that requires the battery to provide DC power, causing problems in the power system. Therefore, multiple batteries are often connected in parallel between the positive and negative poles of the DC bus.

[0004] Batteries need to be regularly tested for capacity to determine their performance status, so that abnormal batteries can be replaced in time to ensure that the required DC bus is powered. When performing a capacity test on multiple batteries in parallel, the connection between the battery to be tested and the DC bus needs to be disconnected, and the required DC bus cannot be fully powered while the capacity test is being performed, resulting in reduced power supply security and system stability. In addition, the circulation between multiple batteries in parallel is large, which will accelerate battery aging, increase maintenance costs, and bring safety hazards.

[0005] When multiple batteries connected in parallel are used as backup DC power supplies for the DC bus in the related art, there are problems such as reduced power supply safety and large circulating current during verification capacity testing, and no effective solution has been proposed so far. Summary of the invention

[0006] The embodiments of the present invention provide a DC bus power supply method and circuit based on a parallel DC power supply, which at least solves the problem in the related art that when multiple groups of batteries connected in parallel are used as backup DC power supplies for the DC bus, there is a decrease in power supply safety and a large circulating current when performing a verification capacity test.

[0007] The DC bus power supply method based on parallel DC power supplies provided by the present invention includes:

[0008] When the AC power supply is normal, rectifying the AC power supply into a DC power supply, and supplying power to the DC bus, the first storage battery and the second storage battery through the DC power supply;

[0009] In the case of an abnormality of the AC power supply, the DC bus is supplied with power through the second storage battery until the power of the second storage battery is fully discharged, and then the DC bus is supplied with power through the first storage battery;

[0010] In the case of a verification capacity test, the second storage battery is discharged to the DC bus for testing; after the second storage battery is tested, the first storage battery is discharged to the DC bus for testing, and power is supplied to the second storage battery through the first storage battery to ensure that the second storage battery is not empty;

[0011] The capacity of the first battery is greater than that of the second battery, the first battery and the second battery form a battery pack, and a plurality of the battery packs are connected in parallel between the positive and negative electrodes of the DC bus.

[0012] The DC bus power supply method based on parallel DC power supply provided by the embodiment of the present invention, after the second battery is tested, comprises:

[0013] When the test result of the second storage battery does not meet the standard threshold, controlling the discharge circuit between the second storage battery and the DC bus to be turned off;

[0014] When the test result of the second battery meets the standard threshold, the power supply circuit between the first battery and the second battery is controlled to be turned on, and the discharge circuit between the second battery and the DC bus is controlled to be turned off until the second battery is fully charged; the discharge circuit between the first battery and the DC bus is controlled to be turned on, and the first battery is tested.

[0015] The DC bus power supply method based on parallel DC power supply provided by the embodiment of the present invention is as follows: after the second storage battery is fully charged, the power supply circuit between the first storage battery and the second storage battery is controlled to be turned off;

[0016] When the test result of the first storage battery is normal, the discharge circuit between the first storage battery and the DC bus is controlled to be turned off, and the power supply circuit between the DC power supply and the first storage battery is controlled to be turned on until the first storage battery is fully charged.

[0017] The DC bus power supply method based on parallel DC power supplies provided by the present invention also includes:

[0018] When the DC bus needs to reach an impact current of a predetermined threshold, the first battery and the second battery are controlled to supply power to the DC bus.

[0019] The DC bus power supply method based on parallel DC power supplies provided by the present invention also includes:

[0020] In the process of supplying power to the DC bus through the second storage battery and discharging the second storage battery to the DC bus, adjusting the output power of the second storage battery;

[0021] In the process of discharging the first storage battery to the DC bus and supplying power to the second storage battery through the first storage battery, the output power of the first storage battery is adjusted.

[0022] The DC bus power supply circuit based on parallel DC power supplies provided by the present invention includes:

[0023] AC input, used to provide AC power;

[0024] A rectifier module, wherein an input end of the rectifier module is connected to the AC input, and an output end of the rectifier module is connected to a DC bus;

[0025] a first storage battery, wherein the first storage battery is connected to the DC bus through a first charging circuit and a first bidirectional power module, and the first storage battery is also connected to a second storage battery through a second bidirectional power module;

[0026] The second storage battery is connected to the DC bus through the first bidirectional power supply module;

[0027] The capacity of the first battery is greater than that of the second battery, the first battery and the second battery form a battery pack, and a plurality of the battery packs are connected in parallel between the positive and negative electrodes of the DC bus.

[0028] The DC bus power supply circuit based on parallel DC power supply provided by the embodiment of the present invention, the first charging circuit includes a first switch;

[0029] The first switch is connected between the positive electrode of the first battery and the positive electrode of the DC bus, and the negative electrode of the first battery is connected to the negative electrode of the DC bus.

[0030] The DC bus power supply circuit based on the parallel DC power supply provided by the embodiment of the invention also includes a first diode, a second diode and a second switch;

[0031] The positive electrode of the first diode is connected to the positive electrode of the second battery through the second switch, and the negative electrode of the first diode is connected to the positive electrode of the DC bus;

[0032] The anode of the second diode is connected to the cathode of the DC bus, and the cathode of the second diode is connected to the cathode of the second battery.

[0033] The DC bus power supply circuit based on a parallel DC power supply provided by an embodiment of the present invention, the first charging circuit also includes a third diode; the positive electrode of the third diode is connected to the positive electrode of the first battery, and the negative electrode of the third diode is connected to the negative electrode of the DC bus.

[0034] The invention provides a DC bus power supply circuit based on a parallel DC power supply, wherein the first bidirectional power supply module and the second bidirectional power supply module each include two reverse parallel power supply modules, and the power supply modules include a parallel boost converter and a buck converter;

[0035] The first bidirectional power supply module is used to perform voltage boost regulation and constant current regulation on the output power provided by the first storage battery or the second storage battery to the DC bus;

[0036] The second bidirectional power supply module is used to perform constant current regulation on the output power provided by the first storage battery to the second storage battery.

[0037] The invention provides a DC bus power supply method and circuit based on a parallel DC power supply. The capacity of the first battery is greater than that of the second battery. When the AC power supply is abnormal, the DC bus is powered by the second battery until the power of the second battery is fully discharged. The first battery is used to power the DC bus and the second battery, thereby reducing the circulation between multiple parallel battery groups, slowing down battery aging, and reducing maintenance costs.

[0038] When conducting a verification capacity test, the second battery is discharged to the DC bus for testing. After the test of the second battery is completed, the first battery is discharged to the DC bus for testing, thereby realizing online testing. While the first battery is discharged to the DC bus for testing, power is supplied to the second battery through the first battery to ensure that the second battery is not depleted, thereby improving power supply safety and system stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work.

[0040] Figure 1 It is a step flow chart of a DC bus power supply method based on a parallel DC power supply in an embodiment of the present invention.

[0041] Figure 2 It is a structural schematic diagram of a DC bus power supply circuit based on a parallel DC power supply in an embodiment of the invention.

[0042] Figure 3 It is a structural schematic diagram of an electronic device in an embodiment of the invention.

[0043] The above drawings include the following reference numerals:

[0044] 10—first storage battery; 20—second storage battery; AC / DC—rectifier module;

[0045] 1—first charging circuit; DC1—first bidirectional power supply module; DC2—second bidirectional power supply module;

[0046] KM1—first switch; KM2—second switch; KM3—third switch; KM4—fourth switch; KM5—fifth switch; D1—first diode; D2—second diode; D3—third diode. DETAILED DESCRIPTION

[0047] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0048] The DC bus needs to be equipped with batteries to provide DC power when necessary, such as when the AC input is abnormal and the DC bus cannot obtain the DC power obtained from the rectified AC input. Considering the need to ensure a certain power supply redundancy, the DC bus needs to be equipped with multiple batteries.

[0049] When multiple batteries are connected in series between the positive and negative poles of the DC bus, as long as one of the batteries has an open circuit or a reduced discharge capacity, it will be unable to supply power to the DC bus that requires the battery to provide DC power, causing problems in the power system. Therefore, multiple batteries are often connected in parallel between the positive and negative poles of the DC bus.

[0050] Batteries need to be regularly tested for capacity to determine their performance status, so that abnormal batteries can be replaced in time to ensure that the required DC bus is powered. When performing a capacity test on multiple batteries in parallel, the connection between the battery to be tested and the DC bus needs to be disconnected, and the required DC bus cannot be fully powered while the capacity test is being performed, resulting in reduced power supply security and system stability. In addition, the circulation between multiple batteries in parallel is large, which will accelerate battery aging, increase maintenance costs, and bring safety hazards.

[0051] To this end, the present invention provides a DC bus power supply method and circuit based on parallel DC power supplies.

[0052] Please refer to Figure 1 The method steps shown in the figure, the DC bus power supply method based on parallel DC power supply provided by the embodiment of the present invention includes:

[0053] Step S101, when the AC power supply is normal, rectifying the AC power supply into a DC power supply, and supplying power to a DC bus, a first storage battery, and a second storage battery through the DC power supply;

[0054] Step S102, in the case of an abnormal AC power supply, supplying power to the DC bus through the second storage battery until the power of the second storage battery is fully discharged, and supplying power to the DC bus through the first storage battery;

[0055] Step S103, in the case of a verification capacity test, the second battery is discharged to the DC bus for testing; after the second battery test is completed, the first battery is discharged to the DC bus for testing, and power is supplied to the second battery through the first battery to ensure that the second battery is not empty;

[0056] The capacity of the first storage battery is greater than that of the second storage battery. The first storage battery and the second storage battery form a battery pack. A plurality of battery packs are connected in parallel between the positive electrode and the negative electrode of the DC bus.

[0057] Specifically, the AC power supply needs to meet the following conditions at the same time for it to be normal: the AC input voltage is within the specified normal range, there is no overvoltage or undervoltage, and the fluctuation is small; the phase sequence of the AC input voltage is correct, and there is no phase loss; the frequency of the AC power supply is within the normal operating range, close to 50Hz.

[0058] Obviously, the AC power supply is abnormal when the above conditions cannot be met at the same time. At this time, the DC bus cannot obtain the DC power obtained by rectification from the AC input.

[0059] The DC bus is a conductive device used to transmit and distribute DC power. It can be used in many fields such as industrial automation, energy utilization, transportation, data communication, distributed power generation and energy storage, and DC load power supply. Specific application scenarios include substations and DC microgrids.

[0060] Existing power supply modes include: one charger + one set of batteries; one charger + multiple sets of batteries connected in series; one charger + multiple sets of batteries connected in parallel.

[0061] Among them, the charger can convert AC power into DC power and provide it to the DC bus and battery; the above-mentioned group of batteries includes one or more identical batteries, and the use of multiple identical batteries in this group of batteries is configured in combination with the battery capacity. It can be understood that this group of batteries is a large-capacity battery; each of the above-mentioned multiple groups of batteries includes one or more batteries, and the number of batteries in each group of batteries is generally consistent.

[0062] In the case of a verification capacity test, considering that the first battery needs to discharge to the DC bus and supply power to the second battery at the same time, the capacity of the first battery needs to be greater than that of the second battery, for example, the capacity of the first battery is twice that of the second battery.

[0063] It is understandable that those skilled in the art can determine the ratio between the capacity of the first battery and the capacity of the second battery according to the specific battery model and specifications.

[0064] In addition, the first battery and the second battery form a battery pack, and multiple battery packs are connected in parallel between the positive and negative poles of the DC bus. The specific number of the multiple battery packs is determined according to actual needs. In practical applications, the actions of the multiple battery packs are generally kept consistent to reduce circulating current.

[0065] In addition, the specific paths of the above-mentioned "power supply" and "discharge" can be multiple different circuits for clear distinction, or they can be the same circuit; when "power supply" and "discharge" are realized through the same circuit, it is necessary to combine the working principle of the battery or the control strategy for the battery.

[0066] The invention provides a DC bus power supply method based on a parallel DC power supply, in which the capacity of the first battery is greater than that of the second battery. In the case of an abnormal AC power supply, the DC bus is powered by the second battery until the power of the second battery is fully released, and the DC bus and the second battery are powered by the first battery, thereby reducing the circulation current between multiple parallel battery groups, slowing down battery aging, and reducing maintenance costs. In the case of a verification capacity test, the second battery is discharged to the DC bus for testing, and after the second battery test is completed, the first battery is discharged to the DC bus for testing, thereby realizing online testing. While the first battery is discharged to the DC bus for testing, the second battery is powered by the first battery to ensure that the second battery is not empty, thereby improving power supply safety and system stability.

[0067] Among them, circulation refers to the phenomenon that when multiple groups of batteries are used in parallel, the capacity, internal resistance, electromotive force and other parameters of each group of batteries are not exactly the same, resulting in the flow of current between the groups of batteries during the charging and discharging process. The existence of circulation will cause energy loss, increase the heat generated by the battery, accelerate the aging of the battery, and affect the service life and performance. When the number of batteries is large, the circulation problem will be more serious, resulting in unbalanced charging and discharging between the batteries, which in turn affects the stability and reliability of the entire power supply system.

[0068] Obviously, in the case of abnormal AC power supply, compared with the first battery and the second battery supplying power to the DC bus at the same time, the second battery with smaller capacity supplies power to the DC bus first, and then the second battery with larger capacity supplies power to the DC bus, which can reduce the circulating current; in the process of verifying capacity test, the first battery in each battery group supplies power to the second battery independently, there is no parallel connection relationship, and the circulating current generated is very small.

[0069] Online testing means that the connection between the battery to be tested and the DC bus does not need to be disconnected. On the one hand, it means that the battery to be tested does not need to be disconnected from the power supply circuit and taken out, and the test is carried out after being connected to a load dedicated to the test. On the other hand, it means that the battery to be tested can also be tested online when the battery to be tested is supplying power to the DC bus.

[0070] Exemplarily, taking the internal resistance method as an example, the method for performing a capacity verification test on a battery includes:

[0071] The battery to be tested is discharged to a specified load at a predetermined discharge rate and discharge time, for example, 0.1 times the rated capacity of the battery for 10 hours, that is, 0.1C10. In other words, if the rated capacity of a battery is 100Ah, then 0.1C10 means the discharge current is 10A, that is, 0.1 times 100Ah.

[0072] Measure and record the internal resistance and charge change of the above-mentioned battery under test during the discharge process.

[0073] Among them, manual measurement can be performed at fixed time intervals, and the measurement result can be compared with the corresponding data in the standard table. When the difference between the measurement result and the corresponding data is within the standard threshold range, the capacity of the battery to be tested is normal.

[0074] You can also use a dedicated measuring instrument to measure internal resistance and draw discharge curves to achieve automated or semi-automated measurement. In scenarios where high-frequency testing of batteries is required, the measuring instrument can be integrated with the battery.

[0075] Obviously, those skilled in the art can select other testing methods according to actual needs.

[0076] In addition, a test hole can be reserved on the battery for testing, or a test circuit can be connected in series or in parallel on the discharge circuit of the battery to discharge to a specified load. The test circuit is disconnected in non-testing conditions and is electrically connected to the discharge circuit in testing conditions.

[0077] Exemplarily, the test circuit can be simplified into two resistors connected in parallel, and each resistor is controlled by a switch. The external test instrument tests the battery to be tested by testing the two resistors.

[0078] Preferably, step S103, the second battery test is completed, including:

[0079] When the test result of the second storage battery does not meet the standard threshold, the discharge circuit between the second storage battery and the DC bus is controlled to be shut down.

[0080] Obviously, disconnecting the discharge circuit between the abnormal battery and the DC bus in time can reduce safety hazards.

[0081] When the test result of the second storage battery meets the standard threshold, the power supply circuit between the first storage battery and the second storage battery is controlled to be turned on, and the discharge circuit between the second storage battery and the DC bus is controlled to be turned off until the second storage battery is fully charged.

[0082] It can be foreseen that, in the process of the first battery supplying power to the second battery, if the AC power supply is abnormal and the DC bus needs the battery to provide DC power, then the power supply circuit between the first battery and the DC bus can be controlled to be turned on, and the first battery can supply power to the DC bus. Alternatively, when the second battery has not released all its power in the verification capacity test, the power supply circuit between the first battery and the second battery can be controlled to be turned off, and the power supply circuit between the second battery and the DC bus can be controlled to be turned on, and the second battery can supply power to the DC bus until the power of the second battery is fully released, and then the power supply circuit between the first battery and the DC bus can be controlled to be turned on, and the DC bus can be supplied with power by the first battery.

[0083] Further, if the verification capacity test result of the second battery is normal, the discharge circuit between the first battery and the DC bus is controlled to be turned on, and a verification capacity test is performed on the first battery using the same or similar test method.

[0084] Further, after the second storage battery is fully charged, the power supply circuit between the first storage battery and the second storage battery is controlled to be turned off. In other words, after the second storage battery is tested and fully charged, the first storage battery does not need to supply power to the second storage battery.

[0085] Preferably, when the test result of the first storage battery is normal, the discharge circuit between the first storage battery and the DC bus is controlled to be turned off, and the power supply circuit between the DC power supply and the first storage battery is controlled to be turned on until the first storage battery is fully charged.

[0086] Obviously, after the verification capacity test is completed, fully charging the battery in time will help improve system stability.

[0087] Optionally, when the DC bus needs to reach an impact current of a predetermined threshold, both the first storage battery and the second storage battery are controlled to supply power to the DC bus.

[0088] For example, in the event of a DC feeder fault, this can be achieved by giving the DC bus an impact current reaching a predetermined threshold to trip the feeder circuit breaker, and controlling both the first battery and the second battery to supply power to the DC bus, thereby ensuring system safety.

[0089] Among them, DC feeder failure refers to the distribution line distributed from the DC bus in the DC distribution network, that is, the problem of the DC feeder, which will cause power supply interruption and affect the stable operation and reliability of the power system.

[0090] It can be understood that, in the case where the DC bus needs to reach an impact current of a predetermined threshold, controlling the first battery and the second battery to supply power to the DC bus is instantaneous, and the circulating current generated is smaller than that generated by continuous power supply. In addition, the simultaneous power supply in the above situation is to deal with special situations such as DC feeder failures, and will not reduce the beneficial effects of the method of supplying power to the DC bus in the embodiments of the present invention.

[0091] Specifically, during the verification capacity test, after the second battery is tested, the first battery is discharged to the DC bus for testing, and power is supplied to the second battery through the first battery to ensure that the second battery is not depleted.

[0092] This can prevent the second battery from completely discharging its power during the test, causing the second battery to remain empty during the test of the first battery. The continuous emptying of the second battery will shorten its service life. On the other hand, if the DC bus needs an impact current when the second battery is empty, the DC bus will not be able to obtain the impact current in time, affecting the safety and stability of the system.

[0093] Preferably, in the process of supplying power to the DC bus through the second storage battery and discharging the second storage battery to the DC bus, the output power of the second storage battery is adjusted;

[0094] In the process of discharging the first storage battery to the DC bus and supplying power to the second storage battery through the first storage battery, the output power of the first storage battery is adjusted.

[0095] By adjusting the output power, such as boost regulation and constant current regulation, the power supply stability can be improved.

[0096] Please refer to Figure 2 The circuit structure shown in FIG. 1 is based on the DC bus power supply method based on parallel DC power supplies provided by the embodiments of the present invention. The embodiments of the present invention also provide a DC bus power supply circuit based on parallel DC power supplies, including:

[0097] AC input, used to provide AC power;

[0098] The rectifier module AC / DC has an input end connected to the AC input, and an output end of the rectifier module AC / DC is connected to the DC bus;

[0099] The first storage battery 10 is connected to the DC bus through the first charging circuit 1 and the first bidirectional power module DC1 respectively, and the first storage battery 10 is also connected to the second storage battery 20 through the second bidirectional power module DC2;

[0100] The second storage battery 20 is connected to the DC bus through the first bidirectional power module DC1;

[0101] The capacity of the first battery 10 is greater than that of the second battery 20 . The first battery 10 and the second battery 20 form a battery pack. A plurality of battery packs are connected in parallel between the positive and negative electrodes of the DC bus.

[0102] In the DC bus power supply circuit based on parallel DC power supply provided by the embodiment of the present invention, the capacity of the first battery 10 is greater than the capacity of the second battery 20. In the case of abnormal AC power supply, power is supplied to the DC bus through the second battery 20 until the power of the second battery 20 is fully released. Power is supplied to the DC bus and the second battery 20 through the first battery 10, thereby reducing the circulation between the multiple groups of batteries in parallel, slowing down battery aging, and reducing maintenance costs. In the case of a verification capacity test, the second battery 20 is discharged to the DC bus for testing. After the test of the second battery 20 is completed, the first battery 10 is discharged to the DC bus for testing, thereby realizing online testing. While the first battery 10 is discharged to the DC bus for testing, power is supplied to the second battery 20 through the first battery 10 to ensure that the second battery 20 is not empty, thereby improving power supply safety and system stability.

[0103] Optionally, the AC input is at least one of the following:

[0104] Chargers and substations use AC power or AC uninterruptible power supply (UPS).

[0105] The AC / DC rectifier module can be integrated in the charger.

[0106] Optionally, the first charging circuit 1 includes a first switch KM1.

[0107] The first switch KM1 is connected between the positive electrode of the first battery 10 and the positive electrode of the DC bus, and the negative electrode of the first battery 10 is connected to the negative electrode of the DC bus.

[0108] Optionally, the DC bus power supply circuit based on parallel DC power supply further includes a first diode D1, a second diode D2 and a second switch KM2;

[0109] The positive electrode of the first diode D1 is connected to the positive electrode of the second battery 20 through the second switch KM2, and the negative electrode of the first diode D1 is connected to the positive electrode of the DC bus;

[0110] The anode of the second diode D2 is connected to the cathode of the DC bus, and the cathode of the second diode D2 is connected to the cathode of the second battery 20 .

[0111] Optionally, the DC bus power supply circuit based on parallel DC power supplies further includes a third diode D3.

[0112] The anode of the third diode D3 is connected to the anode of the first battery 10 , and the cathode of the third diode D3 is connected to the cathode of the DC bus.

[0113] Optionally, the DC bus power supply circuit based on parallel DC power supplies further includes a third switch KM3, a fourth switch KM4 and a fifth switch KM5.

[0114] The third switch KM3 is connected between the positive pole of the first battery 10 and the positive input terminal of the first bidirectional power supply module DC1, the fourth switch KM4 is connected between the positive pole of the first battery 10 and the positive input terminal of the second bidirectional power supply module DC2, and the fifth switch KM5 is connected between the positive pole of the second battery 20 and the positive input terminal of the first bidirectional power supply module DC1.

[0115] Optionally, the first switch KM1 , the second switch KM2 , the third switch KM3 , the fourth switch KM4 and the fifth switch KM5 are all contactors.

[0116] Specifically, the negative input terminal of the first bidirectional power module DC1 is connected to the negative pole of the first battery 10 and the negative pole of the second battery 20, the positive output terminal of the first bidirectional power module DC1 is connected to the positive pole of the DC bus, and the negative output terminal of the first bidirectional power module DC1 is connected to the negative pole of the DC bus; the negative input terminal of the second bidirectional power module DC2 is connected to the negative pole of the first battery 10, the positive output terminal of the second bidirectional power module DC2 is connected to the positive pole of the second battery 20, and the negative output terminal of the second bidirectional power module DC2 is connected to the negative pole of the second battery 20.

[0117] Optionally, the first bidirectional power module DC1 and the second bidirectional power module DC2 each include two reverse-parallel power modules, and the power modules include a boost converter and a buck converter connected in parallel;

[0118] The first bidirectional power supply module DC1 is used to perform voltage step-up regulation and constant current regulation on the output power provided by the first storage battery 10 or the second storage battery 20 to the DC bus;

[0119] The second bidirectional power supply module DC2 is used for performing constant current regulation on the output power provided by the first storage battery 10 to the second storage battery 20 .

[0120] Adjusting the output power of the first storage battery 10 and the second storage battery 20 can improve power supply stability and system safety.

[0121] It is foreseeable that, according to the specifications and models of the above-mentioned batteries selected and the power supply requirements, technicians in this field can choose bidirectional power modules or other power modules with different structures and more diverse functions as DC1 and DC2.

[0122] For example, please combine Figure 2 As shown, the working process of the DC bus power supply circuit based on parallel DC power supplies provided by the embodiment of the present invention includes:

[0123] Specifically, when the AC power supply is normal, the first switch KM1, the second switch KM2, and the fifth switch KM5 are closed, and the third switch KM3 and the fourth switch KM4 are in the open state; the rectifier module AC / DC outputs DC power to the DC bus, and the DC power supplies power to the first battery 10 and the second battery 20 respectively through the DC bus; wherein, the DC bus supplies power to the first battery 10 through the first charging circuit 1, specifically from the positive pole of the DC bus along the first switch KM1 to the positive pole of the first battery 10, and then from the negative pole of the first battery 10 directly to the negative pole of the DC bus; the DC bus supplies power to the second battery 20 through the first bidirectional power supply module DC1.

[0124] Among them, the DC power supply supplies power to the first battery 10 and the second battery 20 respectively through the DC bus, which belongs to floating charge power supply, which can be divided into semi-floating charge and full floating charge. The specific charging mode and threshold parameters can be set by technical personnel in this field according to the application scenario; when the AC power supply is normal, the DC bus needs to reach a predetermined threshold impact current, and the first battery 10 supplies power to the DC bus through the first switch KM1 to provide a first impact current. At the same time, the second battery 20 supplies power to the DC bus through the first diode D1 and the second diode D2 to provide a second impact current. The sum of the first impact current and the second impact current is the impact current that reaches the predetermined threshold.

[0125] In the above case, the reason why the second battery 20 does not provide the second impact current to the DC bus through the first bidirectional power module DC1 is that the bidirectional power module has usage limitations, such as a maximum threshold for current and an upper limit for power.

[0126] Specifically, when the AC power supply is abnormal, the first switch KM1, the second switch KM2, and the fifth switch KM5 are closed, and the third switch KM3 and the fourth switch KM4 are disconnected. The second battery 20 supplies power to the DC bus through the first bidirectional power module DC1. After the power of the second battery 20 is released, the first battery 10 supplies power to the DC bus through the first switch KM1.

[0127] Among them, when the AC power supply is abnormal, the DC bus needs to reach an impact current of a predetermined threshold, and the first battery 10 provides the first impact current to the DC bus through the first switch KM1. At the same time, the second battery 20 provides the second impact current to the DC bus through the first diode D1 and the second diode D2, which is the same as the case when the AC power supply is normal.

[0128] Specifically, when conducting a verification capacity test, the second battery 20 is tested first, and the first switch KM1 remains in its original state, that is, the first switch KM1 can be in a closed state or an open state, the second switch KM2 and the fifth switch KM5 are closed, and the third switch KM3 and the fourth switch KM4 are opened, and the second battery 20 discharges to the DC bus through the first bidirectional power supply module DC1; after the second battery 20 is tested, the first battery 10 is tested, the first switch KM1 is controlled to be in an open state, the third switch KM3 and the fourth switch KM4 are closed, the second switch KM2 remains closed, and the fifth switch KM5 is opened, and the first battery 10 discharges to the DC bus through the first bidirectional power supply module DC1, and at the same time, the first battery 10 supplies power to the second battery 20 through the second bidirectional power supply module DC2.

[0129] Among them, when conducting a verification capacity test, the DC bus needs to reach an impact current of a predetermined threshold, and the first battery 10 provides the impact current to the DC bus through the third diode D3, and the second battery 20 provides the impact current to the DC bus through the first diode D1 and the second diode D2; when conducting a verification capacity test, if the AC power supply is abnormal, it can be handled according to the above-mentioned AC power supply abnormality.

[0130] The present invention also provides a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the present invention.

[0131] The present invention also provides a computer program product, including a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the present invention.

[0132] The present invention also provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor. The memory stores a computer program executable by the at least one processor, and the computer program is used to enable the electronic device to perform the method of the present invention when executed by the at least one processor.

[0133] refer to Figure 3, the structural block diagram of the electronic device that can be used as the server or client of the embodiment of the invention will now be described, which is an example of the hardware device that can be applied to various aspects of the invention. The electronic device is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the invention described and / or required herein.

[0134] like Figure 3 As shown, the electronic device includes a computing unit 301, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 302 or a computer program loaded from a storage unit 308 into a random access memory (RAM) 303. In the RAM 303, various programs and data required for the operation of the electronic device can also be stored. The computing unit 301, the ROM 302, and the RAM 303 are connected to each other via a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0135] Multiple components in the electronic device are connected to the I / O interface 305, including: an input unit 306, an output unit 307, a storage unit 308, and a communication unit 309. The input unit 306 can be any type of device that can input information to the electronic device, and the input unit 306 can receive input digital or character information, and generate key signal input related to user settings and / or function control of the electronic device. The output unit 307 can be any type of device that can present information, and can include but is not limited to a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 308 can include but is not limited to a disk, an optical disk. The communication unit 309 allows the electronic device to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and can include but is not limited to a modem, a network card, an infrared communication device, and / or a wireless communication transceiver, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0136] The computing unit 301 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 301 include, but are not limited to, a CPU, a graphics processing unit (GPU), various special artificial intelligence (AI) computing units, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 301 performs the various methods and processes described above. For example, in some embodiments, the method embodiments created by the present invention may be implemented as a computer program, which is tangibly contained in a machine-readable medium, such as a storage unit 308. In some embodiments, part or all of the computer program may be loaded and / or installed on an electronic device via a ROM 302 and / or a communication unit 309. In some embodiments, the computing unit 301 may be configured to perform the above-described method in any other appropriate manner (e.g., by means of firmware).

[0137] The computer program for implementing the method of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the computer program, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The computer program can be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0138] In the context of the present invention, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable signal medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, or infrared systems, devices, or equipment, or any suitable combination of the foregoing. More specific examples of machine-readable storage media may include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0139] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative and not restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0140] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0141] The various steps described in the method implementation methods provided by the embodiments of the present invention can be performed in different orders and / or in parallel. In addition, the method implementation methods may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0142] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same and similar parts between the various embodiments refer to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment.

[0143] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of protection. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A DC bus power supply method based on parallel DC power supply, characterized in that: include: When the AC power supply is normal, rectifying the AC power supply into a DC power supply, and supplying power to the DC bus, the first storage battery and the second storage battery through the DC power supply; In the case of an abnormality of the AC power supply, the DC bus is supplied with power through the second storage battery until the power of the second storage battery is fully discharged, and then the DC bus is supplied with power through the first storage battery; In the case of a verification capacity test, the second storage battery is discharged to the DC bus for testing; after the second storage battery is tested, the first storage battery is discharged to the DC bus for testing, and power is supplied to the second storage battery through the first storage battery to ensure that the second storage battery is not empty; The capacity of the first battery is greater than that of the second battery, the first battery and the second battery form a battery pack, and a plurality of the battery packs are connected in parallel between the positive and negative electrodes of the DC bus.

2. The DC bus power supply method based on parallel DC power supply according to claim 1, characterized in that: The second battery test is completed, including: When the test result of the second storage battery does not meet the standard threshold, controlling the discharge circuit between the second storage battery and the DC bus to be turned off; When the test result of the second battery meets the standard threshold, the power supply circuit between the first battery and the second battery is controlled to be turned on, and the discharge circuit between the second battery and the DC bus is controlled to be turned off until the second battery is fully charged; the discharge circuit between the first battery and the DC bus is controlled to be turned on, and the first battery is tested.

3. The DC bus power supply method based on parallel DC power supply according to claim 2, characterized in that: After the second storage battery is fully charged, controlling the power supply circuit between the first storage battery and the second storage battery to be turned off; When the test result of the first storage battery is normal, the discharge circuit between the first storage battery and the DC bus is controlled to be turned off, and the power supply circuit between the DC power supply and the first storage battery is controlled to be turned on until the first storage battery is fully charged.

4. The DC bus power supply method based on parallel DC power supply according to claim 1, characterized in that: The method further comprises: When the DC bus needs to reach an impact current of a predetermined threshold, the first battery and the second battery are controlled to supply power to the DC bus.

5. The DC bus power supply method based on parallel DC power supply according to claim 1, characterized in that: The method further comprises: In the process of supplying power to the DC bus through the second storage battery and discharging the second storage battery to the DC bus, adjusting the output power of the second storage battery; In the process of discharging the first storage battery to the DC bus and supplying power to the second storage battery through the first storage battery, the output power of the first storage battery is adjusted.

6. A DC bus power supply circuit based on parallel DC power supply, characterized in that: include: AC input, used to provide AC power; A rectifier module, wherein an input end of the rectifier module is connected to the AC input, and an output end of the rectifier module is connected to a DC bus; a first storage battery, wherein the first storage battery is connected to the DC bus through a first charging circuit and a first bidirectional power module, and the first storage battery is also connected to a second storage battery through a second bidirectional power module; The second storage battery is connected to the DC bus through the first bidirectional power supply module; The capacity of the first battery is greater than that of the second battery, the first battery and the second battery form a battery pack, and a plurality of the battery packs are connected in parallel between the positive and negative electrodes of the DC bus.

7. The DC bus power supply circuit based on parallel DC power supply according to claim 6, characterized in that: The first charging circuit includes a first switch; The first switch is connected between the positive electrode of the first battery and the positive electrode of the DC bus, and the negative electrode of the first battery is connected to the negative electrode of the DC bus.

8. The DC bus power supply circuit based on parallel DC power supply according to claim 6 or 7, characterized in that: Also comprising a first diode, a second diode and a second switch; The positive electrode of the first diode is connected to the positive electrode of the second battery through the second switch, and the negative electrode of the first diode is connected to the positive electrode of the DC bus; The anode of the second diode is connected to the cathode of the DC bus, and the cathode of the second diode is connected to the cathode of the second battery.

9. The DC bus power supply circuit based on parallel DC power supply according to claim 7, characterized in that: The first charging circuit further includes a third diode; an anode of the third diode is connected to the anode of the first battery, and a cathode of the third diode is connected to the cathode of the DC bus.

10. The DC bus power supply circuit based on parallel DC power supply according to claim 6, characterized in that: The first bidirectional power supply module and the second bidirectional power supply module each include two anti-parallel power supply modules, each of which includes a boost converter and a buck converter connected in parallel; The first bidirectional power supply module is used to perform voltage boost regulation and constant current regulation on the output power provided by the first storage battery or the second storage battery to the DC bus; The second bidirectional power supply module is used to perform constant current regulation on the output power provided by the first storage battery to the second storage battery.

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