Pre-charging control method, device and equipment for super-capacitor energy storage system and storage medium

Abstract

The invention discloses a pre-charging control method, device and equipment for a super-capacitor energy storage system and a storage medium. The pre-charging control method comprises the following steps: sampling current information of a first bridge arm connected to the pre-charging loop, wherein the first bridge arm is any one of an A-phase bridge arm, a B-phase bridge arm and a C-phase bridge arm; pre-charging a super capacitor in the first bridge arm through a driving controller according to the current information and instruction current information set in the pre-charging constant current source device; and when the sampled voltage value of the super capacitor and an instruction voltage value set in the pre-charging constant current source device meet a preset condition, after the first bridge arm is disconnected and a second bridge arm is connected, pre-charging is performed on the super capacitor in the second bridge arm. According to the exemplary embodiment, the convenience of the pre-charging operation is improved, and the charging time and energy loss of the system are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage systems, and in particular to a method, device, equipment and storage medium for pre-charging control of a supercapacitor energy storage system. Background Art

[0002] The high-voltage direct-mounted energy storage system based on the cascaded H-bridge is a common multi-level topology. It has large single-machine power capacity, high system efficiency, and can be directly connected to the medium and high voltage power grid without the need for a boost transformer. It has attracted attention in large-scale energy storage systems.

[0003] In short- to medium-power energy storage scenarios, supercapacitors are gradually replacing lithium batteries due to their high charge and discharge rates and long cycle life. However, compared with lithium batteries, supercapacitors face design issues such as high pre-charge power and long charging time due to their large single-cell capacitance.

[0004] It should be noted that the statements herein merely provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0005] In view of the above problems, the present application proposes a supercapacitor energy storage system pre-charging control method, device, equipment and storage medium that overcome the above problems or at least partially solve the above problems.

[0006] The present application embodiment adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a pre-charging control method for a supercapacitor energy storage system, wherein a pre-charging constant current source device is provided in a pre-charging circuit of the supercapacitor energy storage system, and the pre-charging control method comprises: sampling current information of a first bridge arm connected to the pre-charging circuit, wherein the first bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm; according to the current information and the instruction current information set in the pre-charging constant current source device, pre-charging the supercapacitor in the first bridge arm through a driving controller; when the sampled voltage value of the supercapacitor and the instruction voltage value set in the pre-charging constant current source device meet a preset condition, disconnecting the first bridge arm and connecting to the second bridge arm, and pre-charging the supercapacitor in the second bridge arm, wherein the second bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm that has not been pre-charged.

[0008] Preferably, the drive controller includes a PI controller, and the pre-charging of the supercapacitor in the first bridge arm is performed through the drive controller according to the current information and the command current information set in the pre-charging constant current source device, including: performing calculations on the command current information and the current information of the first bridge arm to obtain current error information; inputting the current error information into the PI controller to obtain a trigger signal of the pre-charging loop; and starting to pre-charge the supercapacitor in the connected first bridge arm according to the trigger signal.

[0009] Preferably, the sampling of the current information of the first bridge arm connected to the pre-charging circuit also includes: setting the switching state of the first combination switch so that any one of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm is connected to the pre-charging circuit, wherein the first combination switch includes a switch in the pre-charging circuit and a switch tube in the first bridge arm.

[0010] Preferably, the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm each include a plurality of cascaded H-bridges; the switching state of the first combination switch is set so that any one of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm is connected to the pre-charging circuit, including: by setting the switch state in the pre-charging circuit and the working state of the switch tube in the H-bridge, the supercapacitor connected to the pre-charging circuit can be cascaded charged.

[0011] Preferably, when the sampled voltage value of the supercapacitor and the command voltage value set in the pre-charging constant current source device meet preset conditions, the first bridge arm is disconnected and the second bridge arm is connected, including: setting the switching state of the second combination switch so that the second bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm is connected to the pre-charging circuit, wherein the second combination switch includes a switch in the pre-charging circuit and a switch tube in the second bridge arm.

[0012] Preferably, the pre-charging of the supercapacitor in the second bridge arm includes: sampling the current information of the second bridge arm connected to the pre-charging circuit, wherein the second bridge arm is any bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm that has not been pre-charged; according to the current information of the second bridge arm and the instruction current information set in the pre-charging constant current source device, pre-charging the supercapacitor in the second bridge arm through a driving controller; when the sampled voltage value of the supercapacitor in the second bridge arm and the instruction voltage value set in the pre-charging constant current source device meet preset conditions, disconnecting the second bridge arm and connecting the third bridge arm, wherein the third bridge arm is the bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm that has not been pre-charged.

[0013] Preferably, when the sampled voltage value of the supercapacitor in the second bridge arm and the instruction voltage value set in the pre-charging constant current source device meet the preset conditions, the second bridge arm is disconnected and the third bridge arm is connected, including: setting the switching state of the third combination switch so that the third bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm is connected to the pre-charging circuit, wherein the third combination switch includes a switch in the pre-charging circuit and a switch tube in the third bridge arm.

[0014] In the second aspect, an embodiment of the present application also provides a pre-charging control device for a supercapacitor energy storage system, the device comprising: a first unit, sampling current information of a first bridge arm connected to the pre-charging circuit, wherein the first bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm; a second unit, according to the current information and the command current information set in the pre-charging constant current source device, pre-charges the supercapacitor in the first bridge arm through a driving controller; a third unit, when the sampled voltage value of the supercapacitor and the command voltage value set in the pre-charging constant current source device meet a preset condition, disconnects the first bridge arm and connects to the second bridge arm, and pre-charges the supercapacitor in the second bridge arm, wherein the second bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm that has not been pre-charged.

[0015] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor; and a memory arranged to store computer executable instructions, wherein when the executable instructions are executed, the processor executes any method as described in the first aspect.

[0016] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, which stores one or more programs, and when the one or more programs are executed by an electronic device including multiple applications, the electronic device executes any method as described in the first aspect.

[0017] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0018] The embodiments disclosed herein charge the supercapacitors of the cascaded H-bridges in the three-phase bridge arms of the energy storage system one by one through the pre-charging circuit, thereby reducing the complexity of on-site operations, improving the safety of the pre-charging process, improving the charging efficiency, and reducing energy loss.

[0019] The above description of the technical solution of the present application is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0021] Figure 1 This is a flow chart of a method for precharging a supercapacitor energy storage system in an embodiment of the present application;

[0022] Figure 2 This is a topology diagram of the pre-charging circuit based on a high-voltage direct-mounted supercapacitor energy storage system;

[0023] Figure 3 This is a topology diagram of a pre-charging system based on a high-voltage direct-mounted supercapacitor energy storage system in an embodiment of the present application;

[0024] Figure 4 This is a flow chart of the pre-charging control method in the embodiment of the present application;

[0025] Figure 5 This is a control block diagram of a pre-charging circuit in an embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of a pre-charging control device for a supercapacitor energy storage system in an embodiment of the present application;

[0027] Figure 7 This is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0029] Supercapacitor energy storage systems have attracted more and more attention in medium and short-term power storage scenarios due to their high charge and discharge rates and long cycle life. However, due to the large single-cell capacitance, supercapacitors face problems such as high pre-charging power and long charging time. The applicant has conducted relevant research on the pre-charging of supercapacitor energy storage systems. In order to solve the pre-charging problem of supercapacitors, the relevant technologies mainly include the following two types of solutions:

[0030] Solution 1: AC series high-power resistor slow start solution. The specific solution is as follows Figure 2As shown, the supercapacitor is pre-charged through an AC series resistor, and when the supercapacitor voltage reaches the starting voltage, the pre-charging resistor is cut off.

[0031] Solution 2: Using a mobile charger to charge each cluster of supercapacitors. Specifically, each cluster of supercapacitors is charged by a mobile charger.

[0032] The problems existing in the relevant technical solutions are as follows:

[0033] Solution 1: The pre-charging resistor selected in this solution has high power and large volume, resulting in large energy loss and low efficiency during the pre-charging process.

[0034] Solution 2: This solution requires human intervention, has high risks, and has complex on-site operations. It also requires pre-charging of all cluster supercapacitors in the entire system, which takes a long time to charge.

[0035] In view of this, the present disclosure proposes a pre-charging control method for a supercapacitor energy storage system. The idea is to design an automated and universal pre-charging control method for a supercapacitor energy storage system in view of the low pre-charging efficiency and low charging efficiency of the high-voltage direct-mounted supercapacitor energy storage system in the prior art. The method pre-charges the three-phase bridge arms of the energy storage system one by one by setting a pre-charging circuit and a pre-charging constant current source device set in the pre-charging circuit, thereby improving the charging efficiency and charging safety and reducing energy loss.

[0036] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0037] The present application provides a method, device and system for pre-charging control of a supercapacitor energy storage system. Figure 1 As shown, a schematic flow chart of a method for precharging a supercapacitor energy storage system in an embodiment of the present application is provided, and the method at least includes the following steps S110 to S130:

[0038] Step S110, sampling current information of a first bridge arm connected to the pre-charging loop, wherein the first bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm.

[0039] In the present disclosure, the topology diagram of the pre-charging system based on the high-voltage direct-mounted supercapacitor energy storage system is as follows: Figure 3 As shown, a pre-charging circuit is added to the energy storage system, and a pre-charging constant current source device M is set in the pre-charging constant current source device, and multiple thyristors are set in the pre-charging constant current source device. Under the control voltage, the thyristor can switch from the off state to the on state. Once turned on, even if the trigger signal is removed, it will remain in the on state until the current drops below a certain value, such as maintaining the current or holding the current, and has a self-holding characteristic.

[0040] The high-voltage direct-mounted supercapacitor energy storage system disclosed in the present invention includes a phase A bridge arm, a phase B bridge arm, and a phase C bridge arm; the phase A bridge arm, the phase B bridge arm, and the phase C bridge arm each include a plurality of cascaded H bridges, and each of the H bridges is connected in parallel with a DC capacitor and a supercapacitor. A DC distributed inductor Lpn (p = a, b, c; n = 1, 2 ... N) is provided between the DC capacitor and the supercapacitor. A switch QF1 is provided between the power grid and the three-phase bridge arm, and a grid-connected reactance L g and an isolating switch S1; an isolating switch S2 is provided between the power grid and the pre-charging constant current source device, and action switches K1, K2, and K3 are provided between the pre-charging constant current source device and each bridge arm.

[0041] In some embodiments, the sampling of current information of the first bridge arm connected to the pre-charging circuit also includes: setting the switching state of the first combination switch so that any one of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm is connected to the pre-charging circuit, wherein the first combination switch includes a switch in the pre-charging circuit and a switch tube in the first bridge arm.

[0042] When pre-charging is turned on, take the pre-charging of the A-phase bridge arm as an example. Disconnect the knife switch S1, close the knife switch S2, close QF1, and operate switches K1 to K 11 , K2 to K 22 , driving the switch tube S bn1 , S bn3 Bypass all units of phase B, the grid passes through QF1 and grid-connected reactor L g , Isolation switch S2, Pre-charge constant current source device M, DC switch K 11 , K 22 , Cascade H-bridge switch tube S an1 , S an4 The anti-parallel diode and switch tube S bn1 , S bn3 A pre-charging loop is formed to charge the supercapacitor of phase A, wherein n=1, 2...N, and N is the number of stages.

[0043] Step S120, pre-charging the supercapacitor in the first bridge arm through a driving controller according to the current information and the instruction current information set in the pre-charging constant current source device;

[0044] In some embodiments, the drive controller includes a PI controller, and the pre-charging of the supercapacitor in the first bridge arm is performed through the drive controller according to the current information and the command current information set in the pre-charging constant current source device, including: performing operations on the command current information and the current information of the first bridge arm to obtain current error information; inputting the current error information into the PI controller to obtain a trigger signal of the pre-charging loop; and starting to pre-charge the supercapacitor in the connected first bridge arm according to the trigger signal.

[0045] like Figure 3 As shown, the pre-charging of the A-phase bridge arm is taken as an example. In the process of charging the supercapacitor of the A-phase bridge arm, a constant current charging instruction current i is set in the pre-charging constant current source device. * , and sample the A phase bridge arm current i a .

[0046] like Figure 5 As shown, by giving a constant current charging instruction i * With the A phase bridge arm current i a By making a difference, we get the DC current error signal △i, that is, △i=i * -i a , and then input the DC current error signal △i into the PI controller to obtain the trigger signal u of the pre-charging circuit rc , driving the pre-charging circuit to charge the supercapacitor. The PI controller is a proportional-integral controller, and its transfer function G pi(s) The expression is as follows:

[0047]

[0048] Among them, s is the Laplace operator, k p is the proportional term coefficient of the PI controller, k i is the integral term coefficient of the PI controller.

[0049] Step S130, when the voltage value of the sampled supercapacitor and the command voltage value set in the pre-charge constant current source device meet the preset conditions, disconnect the first bridge arm and connect to the second bridge arm, and then pre-charge the supercapacitor in the second bridge arm, wherein the second bridge arm is any bridge arm that has not been pre-charged among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm. Wherein, when the voltage value of the sampled supercapacitor and the command voltage value set in the pre-charge constant current source device meet the preset conditions, disconnect the first bridge arm and connect to the second bridge arm, including: setting the switch state of the second combination switch so that the second bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm is connected to the pre-charge circuit, wherein the second combination switch includes a switch in the pre-charge circuit and a switch tube in the second bridge arm.

[0050] like Figure 3 As shown, the second bridge arm is taken as the C-phase bridge arm as an example. Online real-time acquisition of the supercapacitor C on the DC side of the A-phase bridge arm ma1 Voltage U ma1 and the command value U in the pre-charge constant current source device r For comparison, when U r >U ma1 When U r ≤U ma1 When the pre-charging of the super capacitor of phase A is stopped, the switch state of the second combination switch is set, that is, the action switches K3 to K 32 , K2 to K 20 , driving the switch tube S an1 , S an3 Bypass all units of phase A. At this time, the grid is connected through QF1 and grid-connected reactor L g , Isolation switch S2, Pre-charge constant current source M, DC switch K 11 , K 32 , Cascade H-bridge switch tube S an1 , S an3 , switch tube S cn2 , S cn3 The anti-parallel diodes form a pre-charging loop to charge the supercapacitor of phase C, where n=1,2...N, and N is the number of stages.

[0051] In some embodiments, the pre-charging of the supercapacitor in the second bridge arm includes: sampling the current information of the second bridge arm connected to the pre-charging loop, wherein the second bridge arm is any bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm that has not been pre-charged; according to the current information of the second bridge arm and the instruction current information set in the pre-charging constant current source device, pre-charging the supercapacitor in the second bridge arm through a driving controller; when the sampled voltage value of the supercapacitor in the second bridge arm and the instruction voltage value set in the pre-charging constant current source device meet preset conditions, disconnecting the second bridge arm and connecting the third bridge arm, wherein the third bridge arm is the bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm that has not been pre-charged.

[0052] like Figure 5 As shown, the second bridge arm is the C phase bridge arm and the third bridge arm is the B phase bridge arm. When charging the supercapacitor in the C phase bridge arm, the C phase bridge arm current i c ; Given constant current charging instruction i * With the C phase bridge arm current i c By making a difference, we get the DC current error signal △i, that is, △i=i * -i c, and then input the DC current error signal △i into the PI controller to obtain the trigger signal u of the pre-charging circuit rc , driving the pre-charging circuit to charge the supercapacitor, the PI controller is a proportional integral controller, and its transfer function G pi(s) The expression is as follows:

[0053]

[0054] Among them, s is the Laplace operator, k p is the proportional term coefficient of the PI controller, k i is the integral term coefficient of the PI controller.

[0055] Online real-time acquisition of C phase (first stage) DC side supercapacitor C mc1 Voltage U mc1 , and with the command value U r For comparison, when U r >U mc1 When U r ≤U mc1 When the pre-charging of the C phase supercapacitor is stopped, the actuation switches K1 to K 10 , K2 to K 21 , K3 to K 32 , driving the switch tube S cn1 , S cn3 Bypass all units of phase C, the grid passes through QF1 and grid-connected reactor L g , Isolation switch S2, Pre-charge constant current source M, DC switch K 21 , K 32 , Cascade H-bridge switch tube S bn1 , S bn4 The anti-parallel diode and switch tube S cn1 , S cn3 A pre-charging loop is formed to charge the supercapacitor of phase B, wherein n=1, 2...N, and N is the number of stages.

[0056] like Figure 5 As shown, when charging the supercapacitor in the B-phase bridge arm, a constant current charging instruction i is given. * With the B phase bridge arm current i b By making a difference, we get the DC current error signal △i, that is, △i=i * -i b , and then input the DC current error signal △i into the PI controller to obtain the trigger signal u of the pre-charging circuit rc , driving the pre-charging circuit to charge the supercapacitor, the PI controller is a proportional integral controller, and its transfer function G pi(s) The expression is as follows:

[0057]

[0058] Among them, s is the Laplace operator, k p is the proportional term coefficient of the PI controller, k i is the integral term coefficient of the PI controller.

[0059] Online real-time acquisition of the first-stage DC side supercapacitor C of phase B mb1 Voltage U mb1 , and with the command value U r For comparison, when U r >U mb1 When U r ≤U mb1 When the pre-charging of the super capacitor of phase B is stopped, the switch K1 to K 10 , K2 to K 20 , K3 to K 30 , disconnect QF1, disconnect switch S2, close switch S1, and pre-charging is completed.

[0060] In one example, a high-voltage direct-mounted supercapacitor energy storage system is connected to a 35kV grid, with 53 levels of system, and the operating voltage range of each cluster of supercapacitors is 700-1100V. Figure 4 The pre-charging control method flow chart shown in FIG. includes the following steps:

[0061] Step 1: Open switch S1, close switch S2, close QF1, and operate switches K1 to K 11 , K2 to K 22 , driving the switch tube S bn1 , S bn3 Bypass all units of phase B, the grid passes through QF1 and grid-connected reactor L g , Isolation switch S2, Pre-charge constant current source device M, DC switch K 11 , K 22 , Cascade H-bridge switch tube S an1 , S an4 The anti-parallel diode and switch tube S bn1 , S bn3 A pre-charging loop is formed to charge the supercapacitor of phase A, wherein n=1,2…53.

[0062] Step 2: Sample the A-phase bridge arm current i a .

[0063] Step 3: Give constant current charging instruction i * is 100A and the A phase bridge arm current i a By making a difference, we get the DC current error signal △i, that is, △i=i * -ia , and then input the DC current error signal △i into the PI controller to obtain the trigger signal u of the pre-charging circuit rc , driving the pre-charging circuit to charge the supercapacitor, the PI controller is a proportional integral controller, and its transfer function G pi(s) The expression is as follows:

[0064]

[0065] Among them, s is the Laplace operator, k p is the proportional term coefficient of the PI controller, k i is the integral term coefficient of the PI controller.

[0066] Step 4: Set the command value U r The voltage of the super capacitor C on the DC side of phase A (first stage) is 540V. ma1 Voltage U ma1 , and with the command value U r For comparison, when U r >U ma1 When U r ≤U ma1 Go to step 5.

[0067] Step 5: Stop precharging the supercapacitor of phase A and switch K3 to K 32 , K2 to K 20 , driving the switch tube S an1 , S an3 Bypass all units of phase A, the grid passes through QF1 and grid-connected reactor L g , Isolation switch S2, Pre-charge constant current source M, DC switch K 11 , K 32 , Cascade H-bridge switch tube S an1 , S an3 , switch tube S cn2 , S cn3 The anti-parallel diodes form a pre-charging loop to charge the supercapacitor of phase C, where n = 1, 2...53.

[0068] Step 6: Give constant current charging instruction i * is 100A and the A phase bridge arm current i a By making a difference, we get the DC current error signal △i, that is, △i=i * -i a , and then input the DC current error signal △i into the PI controller to obtain the trigger signal u of the pre-charging circuit rc , driving the pre-charging circuit to charge the supercapacitor, the PI controller is a proportional integral controller, and its transfer function G pi(s) The expression is as follows:

[0069]

[0070] Among them, s is the Laplace operator, k p is the proportional term coefficient of the PI controller, k i is the integral term coefficient of the PI controller.

[0071] Step 7: Set the command value U r It is a 540V online real-time acquisition of the first-stage DC side supercapacitor C of phase C. mc1 Voltage U mc1 , and with the command value U r For comparison, when U r >U mc1 When U r ≤U mc1 Go to step 8.

[0072] Step 8: Stop precharging the C-phase supercapacitor and activate switches K1 to K 10 , K2 to K 21 , K3 to K 32 , driving the switch tube S cn1 , S cn3 Bypass all units of phase C, the grid passes through QF1 and grid-connected reactor L g , Isolation switch S2, Pre-charge constant current source M, DC switch K 21 , K 32 , Cascade H-bridge switch tube S bn1 , S bn4 The anti-parallel diode and switch tube S cn1 , S cn3 A pre-charging loop is formed to charge the supercapacitor of phase B, wherein n=1,2…53.

[0073] Step 9: Give constant current charging instruction i * is 100A and the B phase bridge arm current i b By making a difference, we get the DC current error signal △i, that is, △i=i * -i b , and then input the DC current error signal △i into the PI controller to obtain the trigger signal u of the pre-charging circuit rc , driving the pre-charging circuit to charge the supercapacitor, the PI controller is a proportional integral controller, and its transfer function G pi(s) The expression is as follows:

[0074]

[0075] Among them, s is the Laplace operator, k p is the proportional term coefficient of the PI controller, ki is the integral term coefficient of the PI controller.

[0076] Step 10: Set the command value U r The voltage of the first-stage DC side supercapacitor C of phase B is collected online in real time. mb1 Voltage U mb1 , and with the command value U r For comparison, when U r >U mb1 When U r ≤U mb1 Go to step 11.

[0077] Step 11: Stop precharging the supercapacitor of phase B and activate switches K1 to K 10 , K2 to K 20 , K3 to K 30 , disconnect QF1, disconnect switch S2, close switch S1, and pre-charging is completed.

[0078] The present application also provides a supercapacitor energy storage system pre-charging control device 600, such as Figure 6 As shown, a schematic diagram of the structure of a supercapacitor energy storage system pre-charging control device in an embodiment of the present application is provided, wherein the device 600 comprises at least: a first unit 610, a second unit 620 and a third unit 630, wherein:

[0079] In one embodiment of the present application, the first unit 610 is specifically used to: sample current information of a first bridge arm connected to the pre-charging loop, wherein the first bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm.

[0080] In one embodiment of the present application, the second unit 620 is specifically used to pre-charge the supercapacitor in the first bridge arm through a driving controller according to the current information and the instruction current information set in the pre-charging constant current source device.

[0081] In one embodiment of the present application, the third unit 630 is specifically used for: when the sampled voltage value of the supercapacitor and the instruction voltage value set in the pre-charge constant current source device meet a preset condition, after disconnecting the first bridge arm and connecting the second bridge arm, pre-charging the supercapacitor in the second bridge arm, wherein the second bridge arm is any bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm that has not been pre-charged.

[0082] It can be understood that the above-mentioned supercapacitor energy storage system pre-charging control device can implement the various steps of the supercapacitor energy storage system pre-charging control method provided in the aforementioned embodiment, and the relevant explanations about the supercapacitor energy storage system pre-charging control method are applicable to the supercapacitor energy storage system pre-charging control device, which will not be repeated here.

[0083] Figure 7 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present application. Figure 7 At the hardware level, the electronic device includes a processor, and optionally also includes an internal bus, a network interface, and a memory. The memory may include a memory, such as a high-speed random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk storage. Of course, the electronic device may also include hardware required for other services.

[0084] The processor, network interface and memory can be interconnected through an internal bus, which can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0085] The memory is used to store the program. Specifically, the program may include a program code, and the program code includes a computer operation instruction. The memory may include a memory and a non-volatile memory, and provides instructions and data to the processor.

[0086] The processor reads the corresponding computer program from the non-volatile memory into the memory and then runs it, forming a supercapacitor energy storage system pre-charging control device at the logical level. The processor executes the program stored in the memory and is specifically used to perform the following operations:

[0087] The current information of the first bridge arm connected to the pre-charging circuit is sampled, wherein the first bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm; the supercapacitor in the first bridge arm is pre-charged by a driving controller according to the current information and the instruction current information set in the pre-charging constant current source device; when the sampled voltage value of the supercapacitor and the instruction voltage value set in the pre-charging constant current source device meet a preset condition, the first bridge arm is disconnected and the second bridge arm is connected, and the supercapacitor in the second bridge arm is pre-charged, wherein the second bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm that has not been pre-charged.

[0088] The above application Figure 1 The method performed by the pre-charging control device of the supercapacitor energy storage system disclosed in the illustrated embodiment can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in a decoding processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0089] The electronic device may also perform Figure 1 A method for executing a pre-charging control device of a supercapacitor energy storage system, and realizing a pre-charging control device of a supercapacitor energy storage system in Figure 1 The functions of the illustrated embodiment will not be described in detail in the embodiments of the present application.

[0090] The present application also provides a computer-readable storage medium, which stores one or more programs, wherein the one or more programs include instructions, which, when executed by an electronic device including multiple application programs, enable the electronic device to execute Figure 1 The method performed by the supercapacitor energy storage system pre-charging control device in the illustrated embodiment is specifically used to perform:

[0091] The current information of the first bridge arm connected to the pre-charging circuit is sampled, wherein the first bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm; the supercapacitor in the first bridge arm is pre-charged by a driving controller according to the current information and the instruction current information set in the pre-charging constant current source device; when the sampled voltage value of the supercapacitor and the instruction voltage value set in the pre-charging constant current source device meet a preset condition, the first bridge arm is disconnected and the second bridge arm is connected, and the supercapacitor in the second bridge arm is pre-charged, wherein the second bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm that has not been pre-charged.

[0092] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0093] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0094] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0096] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0097] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0098] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0099] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0100] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0101] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A supercapacitor energy storage system pre-charging control method, characterized in that: A pre-charging constant current source device is provided in the pre-charging circuit of the supercapacitor energy storage system, and the pre-charging control method comprises: Sampling current information of a first bridge arm connected to the pre-charging loop, wherein the first bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm; Pre-charging the supercapacitor in the first bridge arm through a driving controller according to the current information and the instruction current information set in the pre-charging constant current source device; When the sampled voltage value of the supercapacitor and the command voltage value set in the pre-charge constant current source device meet the preset conditions, the first bridge arm is disconnected and the second bridge arm is connected, and the supercapacitor in the second bridge arm is pre-charged, wherein the second bridge arm is any bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm that has not been pre-charged.

2. The method according to claim 1, characterized in that: The drive controller includes a PI controller, and the pre-charging of the supercapacitor in the first bridge arm by the drive controller according to the current information and the instruction current information set in the pre-charging constant current source device includes: Calculating the command current information and the current information of the first bridge arm to obtain current error information; Inputting the current error information into the PI controller to obtain a trigger signal of the pre-charging loop; According to the trigger signal, the supercapacitor connected to the first bridge arm starts to be pre-charged.

3. The method according to claim 1, characterized in that: The sampling of the current information of the first bridge arm connected to the pre-charging loop also includes: The switch state of the first combination switch is set so that any one of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm is connected to the pre-charging circuit, wherein the first combination switch includes a switch in the pre-charging circuit and a switch tube in the first bridge arm.

4. The method according to claim 3, characterized in that: The A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm each include a plurality of cascaded H bridges; The step of setting the switch state of the first combination switch so that any one of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm is connected to the pre-charging circuit includes: By setting the switch state in the pre-charging loop and the working state of the switch tube in the H bridge, the supercapacitor connected to the pre-charging loop can be cascade charged.

5. The method according to claim 1, characterized in that: When the sampled voltage value of the supercapacitor and the command voltage value set in the pre-charge constant current source device meet a preset condition, disconnecting the first bridge arm and connecting the second bridge arm comprises: The switch state of the second combination switch is set so that the second bridge arm among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm is connected to the pre-charging circuit, wherein the second combination switch includes a switch in the pre-charging circuit and a switch tube in the second bridge arm.

6. The method according to claim 1, characterized in that: The pre-charging of the supercapacitor in the second bridge arm comprises: Sampling current information of a second bridge arm connected to a pre-charging loop, wherein the second bridge arm is any bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm that is not pre-charged; Pre-charging the supercapacitor in the second bridge arm through a driving controller according to the current information of the second bridge arm and the instruction current information set in the pre-charging constant current source device; When the sampled voltage value of the supercapacitor in the second bridge arm and the instruction voltage value set in the pre-charge constant current source device meet the preset conditions, the second bridge arm is disconnected and the third bridge arm is connected, wherein the third bridge arm is the bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm that is not pre-charged.

7. The method according to claim 6, characterized in that When the sampled voltage value of the supercapacitor in the second bridge arm and the command voltage value set in the pre-charge constant current source device meet a preset condition, disconnecting the second bridge arm and connecting the third bridge arm comprises: The switching state of the third combination switch is set so that the third bridge arm among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm is connected to the pre-charging circuit, wherein the third combination switch includes a switch in the pre-charging circuit and a switch tube in the third bridge arm.

8. A supercapacitor energy storage system pre-charging control device, characterized in that: The device comprises: The first unit samples current information of a first bridge arm connected to the pre-charging loop, wherein the first bridge arm is any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm; The second unit pre-charges the supercapacitor in the first bridge arm through a driving controller according to the current information and the instruction current information set in the pre-charging constant current source device; The third unit, when the sampled voltage value of the supercapacitor and the command voltage value set in the pre-charge constant current source device meet the preset conditions, the first bridge arm is disconnected and the second bridge arm is connected, and the supercapacitor in the second bridge arm is pre-charged, wherein the second bridge arm is any bridge arm among the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm that has not been pre-charged.

9. An electronic device, comprising: processor; and a memory arranged to store computer executable instructions, which when executed cause the processor to perform the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing one or more programs, which, when executed by an electronic device including a plurality of application programs, causes the electronic device to execute the method according to any one of claims 1 to 7.

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