Regulating device for interconnecting load of transformer area

Abstract

The invention provides a transformer area interconnection load adjusting device, and the device comprises an interconnection circuit which comprises a rectification module, an inversion module and an energy storage module, the rectification module comprises a plurality of switching devices, the inversion module comprises a plurality of switching devices, and the energy storage module is electrically connected with the rectification module and the inversion module; the plurality of detection modules are electrically connected with the first transformer area and the second transformer area respectively and are used for detecting the current value of each branch of the first transformer area and the second transformer area in real time; and the adjusting module is electrically connected with the detection module and is used for controlling the switching device of the branch circuit with the maximum current value in the rectification module and the switching device of the branch circuit with the minimum current value in the inversion module to be switched on according to the current values of the branch circuits, so that the branch circuit with the maximum current value performs current compensation on the branch circuit with the minimum current value. The problem that in the prior art, loads between transformer areas cannot be dynamically adjusted in real time is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a regulating device for interconnected loads in substations. Background Art

[0002] At present, the load of rural substations is mainly composed of wells, irrigation, small industries and tea frying, showing strong seasonal and cyclical fluctuations. Different economic structures easily lead to heavy loads and overloads in some substations. The load of urban distribution networks has risen sharply, showing a regional density and imbalance. For the southern region, the demand for air conditioning increases in summer, and the phenomenon of heavy loads and overloads in substations is easy to occur. In the case of overload, the current adjustment method is based on manual adjustment of substation loads, but the shortcomings of manual adjustment of substation load distribution are: it is impossible to achieve dynamic adjustment, the timeliness of manual adjustment is low, and it is only adjusted when the substation is heavily overloaded. The workload of manual load adjustment is large, and the quality requirements of load adjustment personnel are high. It is difficult for some large-load users to balance through manual adjustment.

[0003] Based on the low-voltage substations themselves, each substation is connected to each other through a DC transmission line, which has high investment costs and increases the probability of line failure. The voltage of the DC transmission line is high, and the risk of electric shock is high. The inter-substation communication is through power carrier, which has weak anti-interference ability and low signal transmission accuracy. The solution has low integration and requires coordination between the equipment in each substation, and the timeliness and accuracy of load regulation are not high enough. Summary of the invention

[0004] The main purpose of the present application is to provide a device for regulating interconnected loads between substations, so as to solve the problem in the prior art that it is impossible to dynamically regulate the loads between substations in real time.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a regulating device for interconnected loads in substations is provided, comprising: an interconnected circuit, comprising a rectifier module, an inverter module and an energy storage module, wherein the rectifier module is used to be electrically connected to the first substation, the rectifier module includes a plurality of switching devices, the inverter module is used to be electrically connected to the second substation, the inverter module includes a plurality of the switching devices, and the energy storage module is electrically connected to the rectifier module and the inverter module respectively; a plurality of detection modules are used to be electrically connected to the first substation and the second substation respectively, and are used to detect the current value of each branch of the first substation and the second substation in real time; a regulating module is electrically connected to the detection module, and is used to control the switch device of the branch with the largest current value in the rectifier module and the switch device of the branch with the smallest current value in the inverter module to open according to the current value of each branch, so that the branch with the largest current value performs current compensation on the branch with the smallest current value.

[0006] Optionally, the rectifier module includes a first rectifier branch, a second rectifier branch and a third rectifier branch, the first rectifier branch, the second rectifier branch and the third rectifier branch are connected in parallel, and one end of the first rectifier branch, the second rectifier branch and the third rectifier branch in parallel is electrically connected to the first station area, and the other end is electrically connected to the energy storage module.

[0007] Optionally, the inverter module includes a first inverter branch, a second inverter branch and a third inverter branch, the first inverter branch, the second inverter branch and the third inverter branch are connected in parallel, and one end of the first inverter branch, the second inverter branch and the third inverter branch is electrically connected to the second station, and the other end is electrically connected to the energy storage module.

[0008] Optionally, the first rectifier branch, the second rectifier branch and the third rectifier branch all include an inductor element and a rectifier unit, and the inductor element is connected in series with the first rectifier branch, the second rectifier branch and the third rectifier branch; the first inverter branch, the second inverter branch and the third inverter branch all include an inductor element and an inverter unit, and the inductor element is connected in series with the first inverter branch, the second inverter branch and the third inverter branch.

[0009] Optionally, the rectifier unit and the inverter unit also include a first capacitor, a second capacitor and a freewheeling diode, and the switching device includes a first IGBT and a second IGBT, wherein: the first IGBT is connected in series with the inductor element and the second IGBT respectively, the first IGBT is connected in parallel with the first capacitor, the emitter of the first IGBT is electrically connected to the anode of the freewheeling diode, and the collector of the first IGBT is electrically connected to the cathode of the freewheeling diode; the second IGBT is connected in parallel with the second capacitor.

[0010] Optionally, the interconnection circuit further includes a current exchange module, and the current exchange module is electrically connected to at least the rectifier module and the inverter module respectively.

[0011] Optionally, the current exchange module includes a first current exchange unit and a second current exchange unit, the first current exchange unit is electrically connected to the energy storage module, the rectifier module and the inverter module respectively, and the second current exchange unit is electrically connected to the inverter module and the rectifier module respectively.

[0012] Optionally, the first current exchange unit includes a first current exchange branch, a second current exchange branch and a third current exchange branch, the first current exchange branch, the second current exchange branch and the third current exchange branch are connected in parallel, and the first ends of the first current exchange branch, the second current exchange branch and the third current exchange branch in parallel are electrically connected to the energy storage module and the inverter module respectively, and the other ends are electrically connected to the rectifier module.

[0013] Optionally, the second current exchange unit includes a third current exchange branch, a fourth current exchange branch and a fifth current exchange branch, the third current exchange branch, the fourth current exchange branch and the fifth current exchange branch are connected in parallel, and the first ends of the third current exchange branch, the fourth current exchange branch and the fifth current exchange branch are electrically connected to the inverter module, and the other ends are electrically connected to the rectifier module.

[0014] Optionally, the interconnection circuit also includes a first protection module, a second protection module, a first filtering module and a second filtering module, one end of the first protection module is electrically connected to the first station, and the other end is electrically connected to the first filtering module, one end of the second protection module is electrically connected to the second station, and the other end is electrically connected to the second filtering module.

[0015] The regulating device for interconnected loads of the substations of the present application includes an interconnection circuit, a detection module and an adjustment module, wherein the detection module is used to detect the current values ​​of multiple branches in the first substation and the second substation in real time, and the adjustment module determines whether there is a deviation between the current values ​​of the above branches. In the case of a deviation, an adjustment instruction is issued to the interconnection circuit, so that the branch with a large current value corresponding to the first substation or the second substation is the branch with a small current in the second substation or the first substation for current compensation. During the compensation process, the switch devices of the rectifier module and the inverter module corresponding to the corresponding branch will be controlled to open, so that the circuit is turned on, and the branch with small current can be successfully compensated to ensure the balance of the three-phase voltage of the first substation and the second substation, thereby adjusting the load of the first substation and the second substation. The problem that the existing technology cannot realize real-time dynamic adjustment of the load between substations is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 A structural block diagram of a device for regulating interconnected loads in a substation according to an embodiment of the present application is shown;

[0018] Figure 2A schematic diagram of the structure of an interconnection circuit according to an embodiment of the present application is shown;

[0019] Figure 3 A structural schematic diagram of another interconnection circuit according to an embodiment of the present application is shown.

[0020] The above drawings include the following reference numerals:

[0021] 10. Interconnection circuit; 11. Rectification module; 12. Inversion module; 13. Energy storage module; 14. First current exchange unit; 15. Second current exchange unit; 16. Protection module; 17. Filter module; 18. Circuit breaker; 19. Fuse; 20. First substation; 30. Second substation; 40. Detection module; 50. Adjustment module. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0025] As introduced in the background technology, the current method for adjusting the load balance between substations is based on manual adjustment of the substation load, but the disadvantages of manual adjustment of the substation load distribution are: it is impossible to achieve dynamic adjustment, the timeliness of manual adjustment is low, and it is only adjusted when the substation is severely overloaded. The workload of manual load adjustment is large, and the quality requirements of the load adjustment personnel are high. It is difficult for some large-load users to balance through manual adjustment. Based on the low-voltage substation itself, each substation is connected to each other through a DC transmission line, the investment cost is high, and the probability of line failure increases. The voltage of the DC transmission line is relatively high, and the risk of electric shock is relatively high. The communication between substations is through power carriers, the anti-interference ability is weak, and the signal transmission accuracy is low. The solution has a low degree of integration, and cooperation between the equipment in each substation is required. The timeliness and accuracy of load adjustment are not high enough.

[0026] The embodiment of the present application provides a device for regulating interconnected loads in a substation area, such as Figures 1 to 3 As shown, it includes: an interconnection circuit 10, including a rectifier module 11, an inverter module 12 and an energy storage module 13, wherein the rectifier module 11 is used to be electrically connected to the first station area 20, the rectifier module 11 includes a plurality of switching devices, the inverter module 12 is used to be electrically connected to the second station area 30, the inverter module 12 includes a plurality of the switching devices, and the energy storage module 13 is electrically connected to the rectifier module 11 and the inverter module 12 respectively; a plurality of detection modules 40, which are used to be electrically connected to the first station area 20 and the second station area 30 respectively, and are used to detect the current value of each branch of the first station area 20 and the second station area 30 in real time; an adjustment module 50, which is electrically connected to the detection module 40, and is used to control the switch device of the branch with the largest current value in the rectifier module 11 and the switch device of the branch with the smallest current value in the inverter module 12 to open according to the current value of each branch, so that the branch with the largest current value performs current compensation on the branch with the smallest current value.

[0027] This application uses the detection module to continuously detect the current value of the three-phase branches in the first and second stations in real time. When the three-phase current imbalance between the first and second stations is detected, the adjustment module opens the switch device of the branch with a large current value in the rectifier module, and the rectifier module converts the AC power of the station into DC power to charge the energy storage module, opens the switch device of the branch with a small current value in the inverter module, extracts DC power from the energy storage module, and converts DC power into AC power to transmit to another station, completing current compensation and maintaining the balance of the three-phase current load between the first and second stations. In this way, the dynamic adjustment of the load of the first and second stations can be completed.

[0028] In some embodiments, Figures 2 to 3The diagram shown in FIG. 1 is a schematic diagram of current I flowing out of the first station 20 to compensate the second station 30, that is, the three-phase branch (A, B, C) in the first station 20 has a branch with a larger current value, and the three-phase branch (A, B, C) in the second station 30 has a branch with a smaller current value, and the first station 20 is used to compensate the second station 30 for current. It is also possible to compensate the first station 20 for current flowing out of the second station 30. In this case, Figure 2 and Figure 3 The functions of the rectifier module 11 and the inverter module 12 are exchanged with each other to complete the current compensation.

[0029] In some optional embodiments, Figures 2 to 3 As shown, the three-phase branch in the first section 20 and the three-phase branch in the second section 30 are electrically connected to the load. The interconnection circuit further includes a first protection module, a second protection module, a first filter module and a second filter module, one end of the first protection module is electrically connected to the first section, and the other end is electrically connected to the first filter module, one end of the second protection module is electrically connected to the second section, and the other end is electrically connected to the second filter module.

[0030] The energy storage module may be one or more capacitors connected in series, and the detection module may be a current transformer. Corresponding current transformers are provided on the three branches A, B, and C of the substation. Figure 2 As shown, a protection module 16 and a filter module 17 are provided between the first stage 20 and the rectifier module 11. The protection module 16 includes a first protection module and a second protection module, and the filter module 17 includes a first filter module and a second filter module ( Figure 2 For the sake of simplicity, only the first protection module and then the first filtering module are shown. Figure 3 The above structure is also included but not shown. The specific location can be referred to Figure 2 ), the first protection module and the second protection module include a circuit breaker 18 and a fuse 19, the first filter module and the second filter module include two capacitors, an inductor and a resistor, the above devices are electrically connected in series, and the series circuit is connected in parallel to the circuit between the fuse 19 and the inductor element. The first filter module can mainly filter out the high-frequency interference generated by the switching device in the rectifier module 11 to avoid affecting the carrier of the first station area 20 (the second filter module located in the second station area 30 mainly filters out the high-frequency interference generated by the switching device in the inverter module 12). A soft start unit can also be placed between the fuse 19 and the filter module 17. The soft start unit contains two parallel branches. The first branch includes a contactor, and the second branch is formed by a contactor and a charging resistor in series. Before the regulating device is turned on, the charging resistor of the second branch is used to pre-charge the energy storage module 13 to ensure that there is energy in the energy storage module 13, so as to facilitate rapid compensation for the branch.

[0031] A calculation module can also be connected between the regulation module and the detection module. After the detection module detects the current, the calculation module performs reactive power separation, harmonic separation and negative sequence current separation on the current, and can accurately obtain the effective value of each phase current, and transmit each phase current value to the regulation module. The regulation module then adjusts the current load balance of the substation according to the effective value of the current.

[0032] The above-mentioned regulating device is connected in parallel between the first substation and the second substation. There is no need to shut down the substation when installing the device, and the power supply to the substation will not be affected when the device fails.

[0033] In some optional embodiments, such as Figures 2 to 3 As shown, the rectifier module 11 includes a first rectifier branch, a second rectifier branch and a third rectifier branch, the first rectifier branch, the second rectifier branch and the third rectifier branch are connected in parallel, and one end of the parallel connection of the first rectifier branch, the second rectifier branch and the third rectifier branch is electrically connected to the first stage 20, and the other end is electrically connected to the energy storage module 13.

[0034] In the above optional implementation, Figure 2 and Figure 3 are two connection forms of the interconnection circuit 10, wherein the IN branch is the zero line of the interconnection branch and the current is zero. Figure 2 and Figure 3 As shown, the rectifier module 11 includes three branches, which correspond to the A, B, and C three-phase branches of the first substation 20 respectively. The AC power of the A branch of the first substation 20 is converted into DC power through the first rectifier branch and enters the energy storage module 13. The AC power of the B branch of the first substation 20 is converted into DC power through the second rectifier branch and enters the energy storage module 13. The AC power of the C branch of the first substation 20 is converted into DC power through the third rectifier branch and enters the energy storage module 13.

[0035] The energy in the above energy storage module can be connected to an energy detection module to detect the energy stored in the energy storage module and reasonably allocate it according to the detected capacity.

[0036] In some optional embodiments, such as Figures 2 to 3 As shown, the inverter module 12 includes a first inverter branch, a second inverter branch and a third inverter branch, the first inverter branch, the second inverter branch and the third inverter branch are connected in parallel, and one end of the first inverter branch, the second inverter branch and the third inverter branch is electrically connected to the second station 30, and the other end is electrically connected to the energy storage module 13.

[0037] In the above optional implementation manner, if Figures 2 to 3As shown, the inverter module 12 includes three branches, which correspond to the A, B, and C three-phase branches of the first substation 20 respectively. The first inverter branch extracts the DC power of the energy storage module 13 and converts it into AC power to perform current compensation for the A branch of the second substation 30. The second inverter branch extracts the DC power of the energy storage module 13 and converts it into AC power to perform current compensation for the B branch of the second substation 30. The third inverter branch extracts the DC power of the energy storage module 13 and converts it into AC power to perform current compensation for the C branch of the second substation 30.

[0038] In some optional embodiments, the first rectifier branch, the second rectifier branch and the third rectifier branch all include inductor elements and rectifier units, and the inductor elements are connected in series with the first rectifier branch, the second rectifier branch and the third rectifier branch; the first inverter branch, the second inverter branch and the third inverter branch all include inductor elements and inverter units, and the inductor elements are connected in series with the first inverter branch, the second inverter branch and the third inverter branch.

[0039] In the above optional implementation, the inductor element is used to generate reactance to suppress the current mutation in the circuit. The inductor element is connected in series with the rectifier unit one by one, and the three series rectifier branches are connected in series with the three series inverter branches.

[0040] In some optional embodiments, the above-mentioned rectifier unit and the above-mentioned inverter unit also include a first capacitor, a second capacitor and a freewheeling diode, and the above-mentioned switching device includes a first IGBT and a second IGBT, wherein: the above-mentioned first IGBT is respectively connected in series with the above-mentioned inductor element and the above-mentioned second IGBT, the above-mentioned first IGBT is connected in parallel with the above-mentioned first capacitor, the emitter of the above-mentioned first IGBT is electrically connected to the anode of the above-mentioned freewheeling diode, and the collector of the above-mentioned first IGBT is electrically connected to the cathode of the above-mentioned freewheeling diode; the above-mentioned second IGBT is connected in parallel with the above-mentioned second capacitor.

[0041] In the above optional implementation, the switch device is located in the rectifier unit and the inverter unit, and the rectifier unit and the inverter unit also include two capacitors and a freewheeling diode, and the switch device can be an IGBT device or other switch semiconductor device. Each rectifier unit and the inverter unit includes two switch devices (a first IGBT and a second IGBT), the first IGBT and the second IGBT are electrically connected in series, the first IGBT is electrically connected in parallel with the first capacitor and the freewheeling diode, and the second IGBT is electrically connected in parallel with the second capacitor, wherein the freewheeling diode can play a role in protecting circuit components in the circuit. When the current direction changes, the freewheeling diode prevents the current from flowing in the reverse direction, thereby protecting other components in the circuit from damage.

[0042] In some optional embodiments, such as Figures 2 to 3As shown, the interconnection circuit further includes a current exchange module, and the current exchange module is electrically connected to at least the rectifier module 11 and the inverter module 12 respectively.

[0043] In the above optional implementation manner, the regulating device processing in the present application can compensate for the current between the first station area and the second station area, and can also detect its own three-phase current. When it detects that its own three-phase current is unbalanced, it can compensate its own current.

[0044] In some optional embodiments, such as Figures 2 to 3 As shown, the current exchange module includes a first current exchange unit 14 and a second current exchange unit 15. The first current exchange unit 14 is electrically connected to the energy storage module 13, the rectifier module 11 and the inverter module 12 respectively, and the second current exchange unit 15 is electrically connected to the inverter module 12 and the rectifier module 11 respectively.

[0045] In the above optional implementation manner, if Figures 2 to 3 As shown, this paragraph describes the current direction marked in the figure. When the first station 20 detects that the current of a phase current branch is high and the current of a phase current branch is low, the AC passes through a branch of the first station 20, and is converted into DC through the inductor and the first current exchange unit 14 in sequence and input into the energy storage module 13. The function of the rectifier module 11 at this time is the function of the inverter module 12, which converts the DC in the energy storage module 13 into AC and then inputs it into another branch of the first station 20 to complete the current compensation. When the second station 30 detects that the current of a phase current branch is high and the current of a phase current branch is low, the AC passes through a branch of the second station 30, and is converted into DC through the inductor and the inverter module 12 in sequence and input into the energy storage module 13. The first current exchange unit 14 converts the DC in the energy storage module 13 into AC and then inputs it into another branch of the second station 30 to complete the current compensation.

[0046] In some optional embodiments, the first current exchange unit includes a first current exchange branch, a second current exchange branch and a third current exchange branch, the first current exchange branch, the second current exchange branch and the third current exchange branch are connected in parallel, and the first ends of the first current exchange branch, the second current exchange branch and the third current exchange branch in parallel are electrically connected to the energy storage module and the inverter module respectively, and the other ends are electrically connected to the rectifier module. The second current exchange unit includes a third current exchange branch, a fourth current exchange branch and a fifth current exchange branch, the third current exchange branch, the fourth current exchange branch and the fifth current exchange branch are connected in parallel, and the first ends of the third current exchange branch, the fourth current exchange branch and the fifth current exchange branch are electrically connected to the inverter module, and the other ends are electrically connected to the rectifier module.

[0047] Specifically, when the first substation detects that the current in the A-phase current branch is high and the current in the C-phase current branch is low, the AC power passes through the A-phase current branch of the first substation, and is converted into DC power through the inductor device and the first current exchange branch of the first current exchange unit in sequence, and is input into the energy storage module. The third rectifier branch of the rectifier module converts the DC power in the energy storage module into AC power and then inputs it into another branch of the first substation to complete current compensation.

[0048] When the second substation detects that the current in the B-phase current branch is high and the current in the A-phase current branch is low, the AC power passes through the B-phase current branch of the second substation, and is converted into DC power through the inductor device and the second inverter branch of the inverter module in sequence and input into the energy storage module. The first current exchange branch of the first current exchange unit converts the DC power in the energy storage module into AC power and then inputs it into the other A-phase branch of the second substation to complete current compensation.

[0049] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0050] 1) The regulating device of the interconnected load of the substation of the present application continuously detects the current value of the three-phase branch in the first substation and the second substation in real time through the detection module. When the three-phase current imbalance between the first substation and the second substation is detected, the regulating module opens the switch device of the branch with large current value in the rectifier module, and the rectifier module converts the AC power of the substation into DC power to charge the energy storage module, opens the switch device of the branch with small current value in the inverter module, extracts DC power from the energy storage module, and converts DC power into AC power to transmit to another substation, completing current compensation and maintaining the balance of the three-phase current load between the first substation and the second substation. In this way, the dynamic regulation of the load of the first substation and the second substation is completed.

[0051] 2) The regulating device for interconnected loads in the present application uses AC lines to convert the AC power obtained from the substation into DC power and store it in the energy storage module, avoiding the high investment cost and high probability of line failure due to the interconnection of each substation through DC transmission lines.

[0052] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0053] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A device for regulating interconnected loads in a substation area, characterized in that: include: An interconnection circuit, comprising a rectifier module, an inverter module and an energy storage module, wherein the rectifier module is used to be electrically connected to the first station area, the rectifier module includes a plurality of switch devices, the inverter module is used to be electrically connected to the second station area, the inverter module includes a plurality of the switch devices, and the energy storage module is electrically connected to the rectifier module and the inverter module respectively; A plurality of detection modules, respectively electrically connected to the first station area and the second station area, and used to detect the current value of each branch of the first station area and the second station area in real time; The regulating module is electrically connected to the detection module and is used to control the opening of the switch device of the branch with the largest current value in the rectifier module and the switch device of the branch with the smallest current value in the inverter module according to the current values ​​of the various branches, so that the branch with the largest current value performs current compensation on the branch with the smallest current value, so as to regulate the load between the first substation and / or the second substation.

2. The adjusting device according to claim 1, characterized in that: The rectifier module includes a first rectifier branch, a second rectifier branch and a third rectifier branch. The first rectifier branch, the second rectifier branch and the third rectifier branch are connected in parallel, and one end of the first rectifier branch, the second rectifier branch and the third rectifier branch in parallel is electrically connected to the first station area, and the other end is electrically connected to the energy storage module.

3. The adjusting device according to claim 2, characterized in that: The inverter module includes a first inverter branch, a second inverter branch and a third inverter branch, the first inverter branch, the second inverter branch and the third inverter branch are connected in parallel, and one end of the first inverter branch, the second inverter branch and the third inverter branch is electrically connected to the second station, and the other end is electrically connected to the energy storage module.

4. The adjusting device according to claim 3, characterized in that: The first rectifier branch, the second rectifier branch and the third rectifier branch each include an inductor element and a rectifier unit, and the inductor element is connected in series with the first rectifier branch, the second rectifier branch and the third rectifier branch; The first inverter branch, the second inverter branch and the third inverter branch each include an inductor element and an inverter unit, and the inductor element is connected in series with the first inverter branch, the second inverter branch and the third inverter branch.

5. The adjusting device according to claim 4, characterized in that: The rectifier unit and the inverter unit each further include a first capacitor, a second capacitor and a freewheeling diode, and the switch device includes a first IGBT and a second IGBT, wherein: The first IGBT is connected in series with the inductor element and the second IGBT respectively, the first IGBT is connected in parallel with the first capacitor, the emitter of the first IGBT is electrically connected to the anode of the freewheeling diode, and the collector of the first IGBT is electrically connected to the cathode of the freewheeling diode; The second IGBT is connected in parallel with the second capacitor.

6. The adjusting device according to claim 1, characterized in that: The interconnection circuit further includes a current exchange module, and the current exchange module is electrically connected to at least the rectifier module and the inverter module respectively.

7. The adjusting device according to claim 6, characterized in that: The current exchange module includes a first current exchange unit and a second current exchange unit. The first current exchange unit is electrically connected to the energy storage module, the rectifier module and the inverter module respectively, and the second current exchange unit is electrically connected to the inverter module and the rectifier module respectively.

8. The adjusting device according to claim 7, characterized in that: The first current exchange unit includes a first current exchange branch, a second current exchange branch and a third current exchange branch, the first current exchange branch, the second current exchange branch and the third current exchange branch are connected in parallel, and the first ends of the first current exchange branch, the second current exchange branch and the third current exchange branch in parallel are electrically connected to the energy storage module and the inverter module respectively, and the other ends are electrically connected to the rectifier module.

9. The adjusting device according to claim 7, characterized in that: The second current exchange unit includes a third current exchange branch, a fourth current exchange branch and a fifth current exchange branch, the third current exchange branch, the fourth current exchange branch and the fifth current exchange branch are connected in parallel, and a first end of the third current exchange branch, the fourth current exchange branch and the fifth current exchange branch is electrically connected to the inverter module, and the other end is electrically connected to the rectifier module.

10. The adjustment device according to claim 1, characterized in that The interconnection circuit also includes a first protection module, a second protection module, a first filtering module and a second filtering module. One end of the first protection module is electrically connected to the first station, and the other end is electrically connected to the first filtering module. One end of the second protection module is electrically connected to the second station, and the other end is electrically connected to the second filtering module.

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