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 the pre-charging loop connected to the first-stage H bridge; according to the current information and instruction current information set in the pre-charging constant current source device, a first-stage super capacitor in the first group of bridge arms is pre-charged through a driving controller; and when the sampled voltage value of the first-stage super capacitor in the first group of bridge arms and an instruction voltage value set in the pre-charging constant current source device meet a first preset condition, bypassing the first-stage H bridge and accessing the ith-stage H bridge of the first group of bridge arms, and then pre-charging the ith-stage super capacitor of the first group of bridge arms. According to the exemplary embodiment, the convenience of the pre-charging operation of the energy storage system is improved, the charging time is shortened, and the energy loss is 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] Supercapacitors are widely used in short-term high-power output and frequency regulation of thermal power units that require fast response and long service life due to their advantages such as high power density, high charge and discharge rate, and long cycle life.

[0003] However, compared with lithium batteries, supercapacitors face design challenges of pre-charging circuits such as large pre-charging power and long charging time due to their large single-cell capacitance. In the application field of high-voltage direct-mounted energy storage, there are many supercapacitor clusters and the capacitance of each cluster is large, so the pre-charging problem is more prominent.

[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: setting a working state of a first combination switch in the pre-charging circuit so that a first-stage H-bridge of a first group of bridge arms in the pre-charging circuit is connected to the pre-charging circuit, wherein the first group of bridge arms comprises any two-phase bridge arms among an A-phase bridge arm, a B-phase bridge arm, and a C-phase bridge arm, and each of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm comprises N cascaded H-bridges, where N is an integer greater than 1. number; sampling the current information of the pre-charging circuit connected to the first-stage H-bridge; pre-charging the first-stage supercapacitor in the first group of bridge arms through a driving controller according to the current information and the command current information set in the pre-charging constant current source device; when the sampled voltage value of the first-stage supercapacitor in the first group of bridge arms and the command voltage value set in the pre-charging constant current source device meet a first preset condition, bypassing the first-stage H-bridge and connecting the i-th stage H-bridge of the first group of bridge arms, pre-charging the i-th stage supercapacitor of the first group of bridge arms, wherein 1<i≤N.

[0008] In the second aspect, the embodiment of the present application also provides a pre-charging control device for a supercapacitor energy storage system, the device comprising: a first unit, setting the working state of the first combination switch in the pre-charging circuit, so that the first-stage H-bridge of the first group of bridge arms in the pre-charging circuit is connected to the pre-charging circuit, wherein the group of bridge arms is any two-phase bridge arms among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm, and the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm each include N cascaded H-bridges, N is an integer greater than 1; a second unit, sampling the pre-charging The circuit current information; the third unit, according to the current information and the command current information set in the pre-charging constant current source device, pre-charges the first-level super capacitor in the first group of bridge arms through the driving controller; the fourth unit, when the sampled voltage value of the first-level super capacitor in the first group of bridge arms and the command voltage value set in the pre-charging constant current source device meet the first preset condition, bypass the first-level H bridge and connect the i-th level H bridge of the first group of bridge arms, and then pre-charge the i-th level super capacitor of the first group of bridge arms, wherein 1<i≤N.

[0009] 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.

[0010] 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.

[0011] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0012] The present invention pre-charges the supercapacitors in the energy storage system by grouping and grading the three-phase bridge arms, thereby reducing the complexity of on-site operations, improving the safety of the pre-charging process, improving the charging efficiency, and reducing energy loss.

[0013] 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

[0014] 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:

[0015] Figure 1 This is a flow chart of a method for precharging a supercapacitor energy storage system in an embodiment of the present application;

[0016] Figure 2 This is the pre-charging circuit topology diagram of the high-voltage direct-mounted supercapacitor energy storage system;

[0017] Figure 3 It is a step-down pre-charging topology based on a high-voltage direct-mounted supercapacitor energy storage system in the embodiment of the present application;

[0018] Figure 4 This is a flow chart of the pre-charging control method in the embodiment of the present application;

[0019] Figure 5 This is a control block diagram of a pre-charging circuit in an embodiment of the present application;

[0020] 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;

[0021] Figure 7 This is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0022] 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.

[0023] 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. In order to solve the pre-charging problem of supercapacitors, the applicant has done a lot of research and found that there are mainly two types of solutions in the relevant technology:

[0024] Solution 1: AC series high-power resistor slow start solution. The specific solution is as follows Figure 2 As 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.

[0025] Solution 2: Using a mobile charger to charge each cluster of supercapacitors. Specifically, each cluster of supercapacitors is charged by a mobile charger.

[0026] The problems existing in the relevant technical solutions are as follows:

[0027] 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.

[0028] 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.

[0029] In view of this, the present disclosure proposes an automated and highly universal pre-charging control method for a supercapacitor energy storage system. The method improves the charging efficiency and charging safety and reduces energy loss by grouping the three-phase bridge arms and charging the cascaded supercapacitors in stages.

[0030] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0031] 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 supercapacitor energy storage system pre-charging control method 100 in an embodiment of the present application is provided, and the pre-charging control method 100 at least includes the following steps S110 to S140:

[0032] Step S110, a pre-charging constant current source device is set in the pre-charging circuit of the energy system, and the pre-charging control method includes: setting the working state of the first combination switch in the pre-charging circuit so that the first-stage H-bridge of the first group of bridge arms in the pre-charging circuit is connected to the pre-charging circuit, wherein the first group of bridge arms includes any two-phase bridge arms among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm, and the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm each include N cascaded H-bridges, and N is an integer greater than 1;

[0033] 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 arranged 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.

[0034] The high-voltage direct-mounted supercapacitor energy storage system disclosed in the present invention comprises an A-phase bridge arm, a B-phase bridge arm, and a C-phase bridge arm; each of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm comprises 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 L is provided between the DC capacitor and the supercapacitor. pn (p=a,b,c;n=1,2…N). Switch QF1, grid-connected reactor Lg and isolating switch S1 are set between the power grid and the three-phase bridge arm; station transformer TF and isolating switch S2 are set between the power grid and the pre-charging constant current source device, and action switches K1, K2 and K3 are set between the pre-charging constant current source device and each bridge arm. The main function of the station transformer TF is to provide reliable AC power for various equipment and pre-charging circuits in the substation.

[0035] In one example, the A-phase bridge arm and the B-phase bridge arm are taken as an example, that is, the first group of bridge arms are the A-phase bridge arm and the B-phase bridge arm. When the first group of bridge arms is pre-charged, the knife switch S1 is opened, the knife switch S2 is closed, and the operation switches K1 to K 11 , K2 to K 22 . Set the single pre-charge level i = 1, for the first level supercapacitor C of phase A and phase B ma1 , C mb1 Charging is performed, and at the same time, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 11 , K 22 , Cascade H-bridge switch tube S aj1 , S aj3 , S bj1 , S bj3 and S a11 , S a14 , S b12 , S b13 The anti-parallel diodes form a pre-charging loop, where j = 1, 2…N and j≠i, and N is the number of stages.

[0036] Step S120, sampling the current information of the pre-charging circuit connected to the first-stage H bridge; Figure 3 It can be known that the pre-charging constant current device M collects the current in the pre-charging circuit at this time, that is, the pre-charging circuit formed by the first-stage H bridge including the A-phase bridge arm and the B-phase bridge arm.

[0037] Step S130, pre-charging the first-stage supercapacitor in the first group of bridge arms through a driving controller according to the current information and the command current information set in the pre-charging constant current source device;

[0038] In some embodiments, the drive controller includes a PI controller, and the first-level supercapacitor in the first group of bridge arms is pre-charged through the drive controller according to the current information and the command current information set in the pre-charging constant current source device, including: obtaining current error information according to the command current information and the current information in the pre-charging loop connected to the first-level H-bridge; inputting the current error information into the PI controller to obtain a trigger signal of the pre-charging loop; and pre-charging the first-level supercapacitor connected to the first group of bridge arms according to the trigger signal.

[0039] In one example, the first-stage H bridge of the A-phase bridge arm and the B-phase bridge arm is taken as an example. The A-phase bridge arm current i a With the given constant current charging instruction i * 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:

[0040]

[0041] 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.

[0042] Step S140, when the sampled voltage value of the first-stage supercapacitor in the first group of bridge arms and the command voltage value set in the pre-charging constant current source device meet the first preset condition, after bypassing the first-stage H-bridge and connecting to the i-th stage H-bridge of the first group of bridge arms, the i-th stage supercapacitor of the first group of bridge arms is pre-charged, wherein 1<i≤N. Wherein, after bypassing the first-stage H-bridge and connecting to the i-th stage H-bridge of the first group of bridge arms, the i-th stage supercapacitor of the first group of bridge arms is pre-charged, including: by setting the working state of the second combination switch in the pre-charging circuit, the i-th stage supercapacitor in the first group of bridge arms is connected to the pre-charging circuit, wherein the working state of the second combination switch includes the switch tube state of the H bridge in the first group of bridge arms.

[0043] Online real-time data collection of the first-level DC side supercapacitor C of phase A ma1 Voltage U ma1 , and with the command value U r / 2 for comparison, when U r / 2>U ma1 When U r / 2≤U ma1 When the A and B phases are stopped, the first stage super capacitor C ma1 , C mb1 Charge, exit all unit bypass at the same time, change pre-charge level i=i (0) +1, where i (0) is the number of pre-charge stages in the last time, where i≤N and N is the number of stages.

[0044] For the i-th supercapacitor C of phase A and B mai , C mbi To charge, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 11 , K 22 , Cascade H-bridge switch tube S aj1 , S aj3 , S bj1 , S bj3 and S ai1 , S ai4 , S bi2 , S bi3 The anti-parallel diodes form a pre-charging loop, where j = 1, 2…N and j≠i, and N is the number of stages.

[0045] The current i of the bridge arm of phase A when sampling is connected to the i-th level supercapacitor a With the given constant current charging instruction i * 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:

[0046]

[0047] Among them, s is the Laplace operator, k pis the proportional term coefficient of the PI controller, k i is the integral term coefficient of the PI controller.

[0048] Online real-time data collection of the supercapacitor C at the DC side of phase A i mai Voltage U mai , and with the command value U r / 2 for comparison, when U r / 2>U mai When U r / 2≤U mai When the A and B phases are stopped, the i-th level supercapacitor C mai , C mbi Charge.

[0049] It can be understood that when pre-charging the supercapacitor, the station transformer TF in the pre-charging circuit is used to group the three-phase bridge arms, and then the supercapacitors in the grouped bridge arms are graded for pre-charging, so that low-voltage charging can be achieved. Especially in the scenario with a large number of H-bridge cascade stages, this pre-charging method can improve the safety of the pre-charging process and the pre-charging efficiency, and reduce energy loss.

[0050] In some embodiments, after the N-level supercapacitors in the first group of bridge arms are pre-charged, the first group of bridge arms are disconnected and connected to the second group of bridge arms, and the first-level supercapacitors in the second group of bridge arms are pre-charged; wherein the two groups of bridge arms are any two-phase bridge arm combination of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm except the first group of bridge arms. Wherein, the pre-charging of the first-level supercapacitors in the second group of bridge arms includes: sampling the current information of the first-level H-bridge connected to the second group of bridge arms; according to the current information of the first-level H-bridge of the second group of bridge arms and the command current information set in the pre-charging constant current source device, the first-level supercapacitors in the second group of bridge arms are pre-charged by the driving controller; when the sampled voltage value of the first-level supercapacitor in the second group of bridge arms and the command voltage value set in the pre-charging constant current source device meet the first preset condition, the first-level H-bridge in the second group of bridge arms is bypassed and the i-th H-bridge in the second group of bridge arms is connected, and the i-th supercapacitor in the second group of bridge arms is pre-charged, wherein 1<i≤N.

[0051] Taking the first group of bridge arms as a combination of phase A and phase B, and the second group of bridge arms as a combination of phase A and phase C as an example, when the N-level supercapacitors in the first group of bridge arms are pre-charged, the pre-charging of the supercapacitors of phases A and B is stopped, and the switches K3 to K 32 , K2 to K 20 .

[0052] Set the single pre-charge level i = 1, for the first level supercapacitor C of phase A and Cma1 , C mc1 To charge, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 11 , K 32 , Cascade H-bridge switch tube S aj1 , S aj3 , S cj1 , S cj3 and S a11 , S a14 , S c12 , S c13 The anti-parallel diodes form a pre-charging loop, where j = 1, 2…N and j≠i, and N is the number of stages.

[0053] When precharging the second bridge arm, sample the A-phase bridge arm current i a With the given constant current charging instruction i * 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:

[0054]

[0055] 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.

[0056] Online real-time acquisition of C phase first-stage DC side supercapacitor C mc1 Voltage U mc1 , and with the command value U r / 2 for comparison, when U r / 2>U mc1 When U r / 2≤U mc1 When the A and C phases are stopped, the first stage super capacitor C ma1 , C mc1 Charge, exit all unit bypass, change pre-charge level i=i (0) +1, where i (0)It is the last pre-charging level. If i<N, continue to charge the next supercapacitor. If i is equal to N, stop pre-charging the current group of bridge arms and continue pre-charging the next group of bridge arms, where N is the level.

[0057] For the i-th supercapacitor C of phase A and C mai , C mci When charging, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 11 , K 32 , Cascade H-bridge switch tube S aj1 , S aj3 , S cj1 , S cj3 and S ai1 , S ai4 , S ci2 , S ci3 The anti-parallel diodes form a pre-charging loop, where j = 1, 2…N and j≠i, and N is the number of stages.

[0058] Sampling A phase bridge arm current i a With the given constant current charging instruction i * 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:

[0059]

[0060] 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.

[0061] Online real-time acquisition of the C phase i-th DC side supercapacitor C mci Voltage U mci , and with the command value U r / 2 for comparison, when U r / 2>U mci When U r / 2≤U mciWhen the A and C phases are stopped, the i-th supercapacitor C mai , C mci Charge.

[0062] In some embodiments, after the N-level supercapacitors in the second group of bridge arms complete pre-charging, the second group of bridge arms are disconnected and connected to the third group of bridge arms, and then the first-level supercapacitors in the third group of bridge arms are pre-charged; wherein the three groups of bridge arms are a combination of two-phase bridge arms of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm except the first group of bridge arms and the second group of bridge arms; when the sampled voltage value of the first-level supercapacitor in the third group of bridge arms and the instruction voltage value set in the pre-charging constant current source device meet the second preset condition, the first-level H-bridge in the third group of bridge arms is bypassed and connected to the i-th level H-bridge in the third group of bridge arms, and then the i-th level supercapacitor in the third group of bridge arms is pre-charged, wherein 1<i≤N. Among them, the sampled voltage value of the first-level supercapacitor in the first group of bridge arms and the command voltage value set in the pre-charge constant current source device meet the first preset condition, including: the sampled voltage value of the first-level supercapacitor in the first group of bridge arms is not less than half of the command voltage value set in the pre-charge constant current source device; the sampled voltage value of the first-level supercapacitor in the third group of bridge arms and the command voltage value set in the pre-charge constant current source device meet the second preset condition, including: the sampled voltage value of the first-level supercapacitor in the third group of bridge arms is not less than the command voltage value set in the pre-charge constant current source device.

[0063] Take the second group of bridge arms as a combination of the A-phase bridge arm and the C-phase bridge arm, and the third group of bridge arms as a combination of the B-phase bridge arm and the C-phase bridge arm as an example. When the N-level supercapacitors in the second group of bridge arms are pre-charged, the pre-charging of the A-phase and C-phase supercapacitors is stopped, and the switches K1 to K 10 , K2 to K 21 .

[0064] Set the single pre-charge level i = 1, for the first level supercapacitor C of phase B and C mb1 , C mc1 To charge, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 21 , K 32 , Cascade H-bridge switch tube S bj1 , S bj3 , S cj1 , S cj3 and S b11 , Sb14 , S c12 , S c13 The anti-parallel diodes form a pre-charging loop, where j = 1, 2…N and j≠i, and N is the number of stages.

[0065] Sampling B phase bridge arm current i b With the given constant current charging instruction i * 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:

[0066]

[0067] 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.

[0068] 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 power supply of the first-stage supercapacitor C of phases B and C is stopped, mb1 , C mc1 Charge. Exit all unit bypasses and change the pre-charge level i=i (0) +1, where i (0) It is the number of pre-charge levels last time. If i<N, the charging process continues.

[0069] For the i-th supercapacitor C of phase B and phase C mbi , C mci To charge, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 21 , K 32 , Cascade H-bridge switch tube S bj1 , S bj3 , Scj1 , S cj3 and S bi1 , S bi4 , S ci2 , S ci3 The anti-parallel diodes form a pre-charging loop, where j = 1, 2…N and j≠i, and N is the number of stages.

[0070] Sampling B phase bridge arm current i b With the given constant current charging instruction i * 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:

[0071]

[0072] 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.

[0073] Online real-time acquisition of the C phase i-th DC side supercapacitor C mci Voltage U mci , and with the command value U r For comparison, when U r >U mci When all the cascaded supercapacitors in the third group of bridge arms are pre-charged, the action switches K2 to K 20 , K3 to K 30 , close S1, open S2, and pre-charging is completed.

[0074] In one example, a high-voltage direct-mounted supercapacitor energy storage system is connected to a 35kV grid, with 94 levels of system, and the operating voltage range of each cluster of supercapacitors is 350-550V. Figure 4 The pre-charging control method flow chart shown in FIG. includes the following steps:

[0075] Step 1: Open the knife switch S1, close the knife switch S2, and operate the switches K1 to K 11 , K2 to K 22 ;

[0076] Step 2: Set the single pre-charge level i = 1, for the first level supercapacitor C of phase A and B ma1 , C mb1 To charge, the switch S is turned on by drivingaj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 11 , K 22 , Cascade H-bridge switch tube S aj1 , S aj3 , S bj1 , S bj3 and S a11 , S a14 , S b12 , S b13 The anti-parallel diode forms a pre-charging loop, where j = 1, 2 ... 94 and j ≠ i;

[0077] Step 3: Set the charging instruction value i * is 50A, sampling A phase bridge arm current i a With the given constant current charging instruction i * 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:

[0078]

[0079] 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;

[0080] Step 4: Set the command value U r / 2 is 140V, and the first-level DC side supercapacitor C of phase A is collected online in real time. ma1 Voltage U ma1 , and with the command value U r / 2 for comparison, when U r / 2>U ma1 When U r / 2≤U ma1 When the A and B phases are stopped, the first stage super capacitor C ma1 , C mb1 To charge, skip to step 5;

[0081] Step 5: Exit all unit bypasses and change the precharge level i=i (0) +1, where i (0) is the last pre-charge level. If i≤94, go to step 6, otherwise go to step 9;

[0082] Step 6: For phase A and B, the i-th level supercapacitor C mai , C mbi To charge, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 11 , K 22 , Cascade H-bridge switch tube S aj1 , S aj3 , S bj1 , S bj3 and S ai1 , S ai4 , S bi2 , S bi3 The anti-parallel diode forms a pre-charging loop, where j = 1, 2 ... 94 and j ≠ i;

[0083] Step 7: Sample the A-phase bridge arm current i a With the given constant current charging instruction i * 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:

[0084]

[0085] 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;

[0086] Step 8: Set the command value U r / 2 is 140V, and the online real-time data is collected from the supercapacitor C at the DC side of phase A at the i-th level. mai Voltage U mai , and with the command value U r / 2 for comparison, when U r / 2>Umai When U r / 2≤U mai When the A and B phases are stopped, the i-th level supercapacitor C mai , C mbi To charge, skip to step 5;

[0087] Step 9: Stop precharging the supercapacitors of phases A and B, and switch K3 to K 32 , K2 to K 20 ;

[0088] Step 10: Set the single pre-charge level i = 1, for the first level supercapacitor C of phase A and C ma1 , C mc1 To charge, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 11 , K 32 , Cascade H-bridge switch tube S aj1 , S aj3 , S cj1 , S cj3 and S a11 , S a14 , S c12 , S c13 The anti-parallel diode forms a pre-charging loop, where j = 1, 2 ... 94 and j ≠ i;

[0089] Step 11: Set the charging instruction value i * is 50A, sampling A phase bridge arm current i a With the given constant current charging instruction i * 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:

[0090]

[0091] 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;

[0092] Step 12: Set the command value U r / 2 is 140V, and the first-level DC side supercapacitor C of phase C is collected online in real time. mc1 Voltage U mc1 , and with the command value U r / 2 for comparison, when U r / 2>U mc1 When U r / 2≤U mc1 When the A and C phases are stopped, the first stage super capacitor C ma1 , C mc1 To charge, go to step 13;

[0093] Step 13: Exit all unit bypasses and change the precharge level i=i (0) +1, where i (0) is the last pre-charge level, if i≤94, go to step 14, otherwise go to step 17;

[0094] Step 14: For phase A and C, the i-th supercapacitor C mai , C mci To charge, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 11 , K 32 , Cascade H-bridge switch tube S aj1 , S aj3 , S cj1 , S cj3 and S ai1 , S ai4 , S ci2 , S ci3 The anti-parallel diode forms a pre-charging loop, where j = 1, 2 ... 94 and j ≠ i;

[0095] Step 15: Set the charging command value i * is 50A, sampling A phase bridge arm current i a With the given constant current charging instruction i * 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 Gpi(s) The expression is as follows:

[0096]

[0097] 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;

[0098] Step 16: Set the command value U r / 2 is 140V, and the online real-time data is collected from the supercapacitor C at the DC side of the i-th stage of phase C. mci Voltage U mci , and with the command value U r / 2 for comparison, when U r / 2>U mci When U r / 2≤U mci When the A and C phases are stopped, the i-th supercapacitor C mai , C mci To charge, go to step 13;

[0099] Step 17: Stop precharging the supercapacitors of phases A and C, and activate switches K1 to K 10 , K2 to K 21 ;

[0100] Step 18: Set the single pre-charge level i = 1, for the first level supercapacitor C of phase B and C mb1 , C mc1 To charge, drive the switch S aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 21 , K 32 , Cascade H-bridge switch tube S bj1 , S bj3 , S cj1 , S cj3 and S b11 , S b14 , S c12 , S c13 The anti-parallel diode forms a pre-charging loop, where j = 1, 2 ... 94 and j ≠ i;

[0101] Step 19: Set the charging command value i * is 50A, sampling the B phase bridge arm current i b With the given constant current charging instruction i* 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:

[0102]

[0103] 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;

[0104] Step 20: Set the command value U r The voltage of the first-stage DC side supercapacitor C of phase C is collected online in real time. 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 power supply of the first-stage supercapacitor C of phases B and C is stopped, mb1 , C mc1 To charge, go to step 21;

[0105] Step 21: Exit all unit bypasses and change the precharge level i=i (0) +1, where i (0) is the last pre-charge level, if i≤94, go to step 22, otherwise go to step 25;

[0106] Step 22: For the i-th supercapacitor C of phase B and C mbi , C mci To charge, the switch S is turned on by driving aj1 , S aj3 , S bj1 , S bj3 , S cj1 , S cj3 Bypass the j-th level unit, the power grid is connected through the station transformer TF, isolation switch S2, pre-charge constant current source device M, DC switch K 21 , K 32 , Cascade H-bridge switch tube S bj1 , S bj3 , S cj1 , S cj3 and S bi1 , S bi4, S ci2 , S ci3 The anti-parallel diode forms a pre-charging loop, where j = 1, 2 ... 94 and j ≠ i;

[0107] Step 23: Set the charging command value i * is 50A, sampling the B phase bridge arm current i b With the given constant current charging instruction i * 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:

[0108]

[0109] 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;

[0110] Step 24: Set the command value U r The voltage of the super capacitor C at the DC side of phase C is 280V. mci Voltage U mci , and with the command value U r For comparison, when U r >U mci When U r ≤U mci When the supercapacitor C of the i-th stage of phase B and C is stopped mbi , C mci To charge, go to step 21;

[0111] Step 25: Action Switch K2 to K 20 , K3 to K 30 , close S1, open S2, and pre-charging is completed.

[0112] It can be understood that the supercapacitor energy storage system pre-charging control method in the exemplary embodiment can perform low-voltage pre-charging, which is easy to operate, has a short system charging time, and has low energy loss.

[0113] The present application also provides a supercapacitor energy storage system pre-charging control device 600, such as Figure 6As shown, a schematic diagram of the pre-charging control structure of the supercapacitor energy storage system in an embodiment of the present application is provided, and the device 600 at least includes: a first unit 610, a second unit 620, a third unit 630 and a fourth unit 640, wherein:

[0114] In one embodiment of the present application, the first unit 610 is specifically used to: set the working state of the first combination switch in the pre-charging circuit, so that the first-level H-bridge of the first group of bridge arms in the pre-charging circuit is connected to the pre-charging circuit, wherein the group of bridge arms are any two-phase bridge arms among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm, and the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm each include N cascaded H-bridges, and N is an integer greater than 1.

[0115] In one embodiment of the present application, the second unit 620 is specifically used to: sample current information of the pre-charging loop connected to the first-stage H-bridge.

[0116] In one embodiment of the present application, the third unit 630 is specifically used to pre-charge the first-level supercapacitor in the first group of bridge arms through a driving controller according to the current information and the instruction current information set in the pre-charging constant current source device.

[0117] In one embodiment of the present application, the fourth unit 640 is specifically used for: when the sampled voltage value of the first-level supercapacitor in the first group of bridge arms and the instruction voltage value set in the pre-charging constant current source device meet a first preset condition, bypassing the first-level H bridge and connecting the i-th level H bridge of the first group of bridge arms, pre-charging the i-th level supercapacitor of the first group of bridge arms, wherein 1<i≤N.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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:

[0123] The working state of the first combination switch in the pre-charging circuit is set so that the first-stage H-bridge of the first group of bridge arms in the pre-charging circuit is connected to the pre-charging circuit, wherein the first group of bridge arms includes any two-phase bridge arms among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm, and the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm each include N cascaded H-bridges, where N is an integer greater than 1; the current information of the pre-charging circuit connected to the first-stage H-bridge is sampled; according to the current information and the instruction current information set in the pre-charging constant current source device, the first-stage supercapacitor in the first group of bridge arms is pre-charged through a driving controller; when the sampled voltage value of the first-stage supercapacitor in the first group of bridge arms and the instruction voltage value set in the pre-charging constant current source device meet a first preset condition, the first-stage H-bridge is bypassed and the i-th stage H-bridge of the first group of bridge arms is connected, and then the i-th stage supercapacitor of the first group of bridge arms is pre-charged, wherein 1<i≤N.

[0124] The above application Figure 1The 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 mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, 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.

[0125] 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.

[0126] 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:

[0127] The working state of the first combination switch in the pre-charging circuit is set so that the first-stage H-bridge of the first group of bridge arms in the pre-charging circuit is connected to the pre-charging circuit, wherein the first group of bridge arms includes any two-phase bridge arms among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm, and the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm each include N cascaded H-bridges, where N is an integer greater than 1; the current information of the pre-charging circuit connected to the first-stage H-bridge is sampled; according to the current information and the instruction current information set in the pre-charging constant current source device, the first-stage supercapacitor in the first group of bridge arms is pre-charged through a driving controller; when the sampled voltage value of the first-stage supercapacitor in the first group of bridge arms and the instruction voltage value set in the pre-charging constant current source device meet a first preset condition, the first-stage H-bridge is bypassed and the i-th stage H-bridge of the first group of bridge arms is connected, and then the i-th stage supercapacitor of the first group of bridge arms is pre-charged, wherein 1<i≤N.

[0128] 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.

[0129] 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.

[0130] 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 comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0131] 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.

[0132] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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: Setting the working state of the first combination switch in the pre-charging circuit so that the first-stage H-bridge of the first group of bridge arms in the pre-charging circuit is connected to the pre-charging circuit, wherein the first group of bridge arms includes any two-phase bridge arms among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm, and each of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm includes N cascaded H-bridges, where N is an integer greater than 1; Sampling current information of the pre-charging circuit connected to the first-stage H-bridge; Pre-charging the first-stage supercapacitor in the first group of bridge arms through a driving controller according to the current information and the command current information set in the pre-charging constant current source device; When the sampled voltage value of the first-level supercapacitor in the first group of bridge arms and the instruction voltage value set in the pre-charge constant current source device meet the first preset condition, the first-level H-bridge is bypassed and the i-th level H-bridge of the first group of bridge arms is connected, and the i-th level supercapacitor of the first group of bridge arms is pre-charged, wherein 1<i≤N.

2. The method according to claim 1, characterized in that: The drive controller includes a PI controller, and the pre-charging of the first-stage supercapacitor in the first group of bridge arms by the drive controller according to the current information and the instruction current information set in the pre-charging constant current source device includes: Acquire current error information according to the command current information and the current information in the pre-charging circuit connected to the first-stage H-bridge; Inputting the current error information into the PI controller to obtain a trigger signal of the pre-charging loop; The first-stage supercapacitor connected to the first group of bridge arms is pre-charged according to the trigger signal.

3. The method according to claim 1, characterized in that: After bypassing the first-stage H-bridge and connecting the i-th-stage H-bridge of the first group of bridge arms, precharging the i-th-stage supercapacitor of the first group of bridge arms comprises: By setting the working state of the second combination switch in the pre-charging circuit, the i-th level supercapacitor in the first group of bridge arms is connected to the pre-charging circuit, wherein the working state of the second combination switch includes the switch tube state of the H bridge in the first group of bridge arms.

4. The method according to any one of claims 1 to 3, characterized in that: After the N-level supercapacitors in the first group of bridge arms are pre-charged, the first group of bridge arms are disconnected and connected to the second group of bridge arms, and then the first-level supercapacitors in the second group of bridge arms are pre-charged; wherein the two groups of bridge arms are any two-phase bridge arm combination among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm except the first group of bridge arms.

5. The method according to claim 4, characterized in that: The pre-charging of the first-stage supercapacitor in the second group of bridge arms includes: Sampling current information of the first-stage H-bridge connected to the second group of bridge arms; Pre-charging the first-stage supercapacitor in the second group of bridge arms through a driving controller according to the current information of the first-stage H-bridge of the second group of bridge arms and the instruction current information set in the pre-charging constant current source device; When the sampled voltage value of the first-level supercapacitor in the second group of bridge arms and the instruction voltage value set in the pre-charge constant current source device meet the first preset condition, the first-level H-bridge in the second group of bridge arms is bypassed and the i-th level H-bridge in the second group of bridge arms is connected, and the i-th level supercapacitor in the second group of bridge arms is pre-charged, where 1<i≤N.

6. The method according to claim 5, characterized in that After the N-level supercapacitors in the second group of bridge arms are pre-charged, the second group of bridge arms are disconnected and connected to the third group of bridge arms, and then the first-level supercapacitors in the third group of bridge arms are pre-charged; wherein the three groups of bridge arms are a combination of two-phase bridge arms of the A-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm except the first group of bridge arms and the second group of bridge arms; When the sampled voltage value of the first-level supercapacitor in the third group of bridge arms and the instruction voltage value set in the pre-charge constant current source device meet the second preset condition, the first-level H-bridge in the third group of bridge arms is bypassed and the i-th level H-bridge in the third group of bridge arms is connected, and the i-th level supercapacitor in the third group of bridge arms is pre-charged, wherein 1<i≤N.

7. The method according to claim 6, characterized in that The sampled voltage value of the first-stage supercapacitor in the first group of bridge arms and the command voltage value set in the pre-charge constant current source device meet a first preset condition, including: The sampled voltage value of the first-stage supercapacitor in the first group of bridge arms is not less than half of the command voltage value set in the pre-charge constant current source device; The sampled voltage value of the first-stage supercapacitor in the third group of bridge arms and the command voltage value set in the pre-charge constant current source device meet the second preset condition, including: The sampled voltage value of the first-stage supercapacitor in the third group of bridge arms is not less than the command voltage value set in the pre-charge constant current source device.

8. A supercapacitor energy storage system pre-charging control device, characterized in that: The device comprises: The first unit sets the working state of the first combination switch in the pre-charging circuit, so that the first-stage H-bridge of the first group of bridge arms in the pre-charging circuit is connected to the pre-charging circuit, wherein the group of bridge arms is any two-phase bridge arms among the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm, and the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm each include N cascaded H-bridges, where N is an integer greater than 1; A second unit, sampling current information of the pre-charging circuit connected to the first-stage H-bridge; A third unit pre-charges the first-stage supercapacitor in the first group of bridge arms through a driving controller according to the current information and the instruction current information set in the pre-charging constant current source device; The fourth unit, when the sampled voltage value of the first-level supercapacitor in the first group of bridge arms and the instruction voltage value set in the pre-charging constant current source device meet the first preset condition, the first-level H-bridge is bypassed and the i-th level H-bridge of the first group of bridge arms is connected, and the i-th level supercapacitor of the first group of bridge arms is pre-charged, wherein 1<i≤N.

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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