String type boost converter system

Abstract

The embodiment of the utility model discloses a string type boost converter system, which comprises a high-voltage looped network all-in-one machine and at least one boost converter all-in-one machine, the high-voltage looped network all-in-one machine comprises an energy storage grid-connected cabinet, a metering cabinet, a PT cabinet and an energy storage wire inlet cabinet, and the energy storage grid-connected cabinet, the metering cabinet, the PT cabinet and the energy storage wire inlet cabinet are electrically connected in sequence; the boosting and converting all-in-one machine comprises a high-voltage switch cabinet, a transformer chamber, a low-voltage communication cabinet and a converting cabinet, and the high-voltage switch cabinet, the transformer chamber, the low-voltage communication cabinet and the converting cabinet are electrically connected in sequence; wherein the transformer chamber comprises a main transformer, and the converter cabinet comprises a plurality of converters; and the energy storage wire inlet cabinet of the high-voltage looped network all-in-one machine can be electrically connected with the high-voltage switch cabinets of one or more boosting and converting all-in-one machines. By adopting the technical scheme, the occupied area can be reduced, and the space utilization rate is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to the technical field of energy storage, especially relates to a string type boost converter system. BACKGROUND

[0002] With the development of new energy, the demand for energy storage configuration is increasing, and the direct current generated by the energy storage battery needs to be converted by the conversion equipment and the voltage conversion equipment between the power grid. The main function of the boost converter integrated machine applied in the energy storage field is to convert the output direct current of the energy storage prefabricated cabin battery system into alternating current, and then the alternating current voltage is raised to the voltage level required by the project by the boost integrated machine. In addition, the boost converter integrated machine can also reduce the voltage of the input power grid, and then convert the alternating current into direct current by the converter to charge the energy storage prefabricated cabin battery system.

[0003] The current boost converter integrated machine product is mainly composed of centralized converter, boost transformer, switch and protection equipment of corresponding device. The current centralized boost converter integrated machine generally only has protection / switch device for the equipment body on the high-voltage side, and additional grid connection cabinet needs to be constructed to connect multiple devices, which increases the land occupation. In some industrial / commercial energy storage projects, PT cabinet (voltage transformer cabinet) and metering cabinet also need to be additionally increased, which will occupy more space.

[0004] For large factories or community energy storage power stations, the available land area is small, and the demand for energy storage battery capacity is large. Therefore, how to reduce the space occupation of land resources in the energy storage project and improve the utilization rate of land resources in the energy storage project has become a technical problem to be solved at present. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of string type boost converter system to reduce land occupation and improve space utilization.

[0006] The utility model embodiment provides a kind of string type boost converter system, comprising: high-voltage ring network integrated machine and at least one boost converter integrated machine;

[0007] The high-voltage ring network integrated machine includes energy storage grid connection cabinet, metering cabinet, PT cabinet and energy storage incoming line cabinet, and the energy storage grid connection cabinet, metering cabinet, PT cabinet and energy storage incoming line cabinet are sequentially electrically connected;

[0008] The boost converter integrated machine includes high-voltage switch cabinet, transformer room, low-voltage communication cabinet and converter cabinet, and the high-voltage switch cabinet, transformer room, low-voltage communication cabinet and converter cabinet are sequentially electrically connected;Wherein, the transformer room includes main transformer, and the converter cabinet includes multiple converters;

[0009] The energy storage incoming line cabinet of the high-voltage ring network integrated machine is electrically connected with the high-voltage switch cabinet of one or more voltage boosting converter integrated machines.

[0010] Optionally, the direct current ends of the plurality of converters are electrically connected with a plurality of battery clusters of a battery cabin respectively; and the alternating current ends of the plurality of converters are connected in parallel.

[0011] The alternating current ends of the plurality of converters connected in parallel are electrically connected with the low-voltage end of the main transformer.

[0012] Optionally, the low-voltage communication cabinet comprises an auxiliary transformer, a monitoring switch unit, a protection switch unit and a fire-fighting switch unit.

[0013] The high-voltage end of the auxiliary transformer is electrically connected with the low-voltage end of the main transformer, and the low-voltage end of the auxiliary transformer is electrically connected with the monitoring switch unit.

[0014] The low-voltage communication cabinet further comprises an uninterruptible power supply (UPS) and a double power supply transfer switch; the input end of the uninterruptible power supply is electrically connected with the monitoring switch unit, the output end of the uninterruptible power supply is electrically connected with the protection switch unit; the first input end of the double power supply transfer switch is electrically connected with the monitoring switch unit, the second input end of the double power supply transfer switch is electrically connected with an external power supply, and the output end of the double power supply transfer switch is electrically connected with the fire-fighting switch unit.

[0015] Optionally, the high-voltage switch cabinet comprises a high-voltage circuit breaker, a high-voltage disconnector and a high-voltage current transformer.

[0016] The first end of the high-voltage circuit breaker is electrically connected with the transformer room through the high-voltage disconnector, and the second end of the high-voltage circuit breaker is electrically connected with the energy storage incoming line cabinet; the high-voltage current transformer is arranged between the high-voltage disconnector and the transformer room.

[0017] Optionally, the energy storage incoming line cabinet comprises at least one incoming line branch.

[0018] When the energy storage incoming line cabinet comprises a plurality of incoming line branches, the first end of the incoming line branch is electrically connected with the high-voltage switch cabinet, the second end of the incoming line branch is connected in parallel, and the second end of the incoming line branch connected in parallel is electrically connected with the PT cabinet.

[0019] Optionally, the incoming line branch comprises an incoming line circuit breaker, an incoming line disconnector and an incoming line current transformer.

[0020] The first end of the incoming line circuit breaker is electrically connected with the high-voltage switch cabinet through the incoming line disconnector, and the second end of the incoming line circuit breaker is electrically connected with the PT cabinet; the incoming line current transformer is arranged between the incoming line disconnector and the high-voltage switch cabinet.

[0021] Optionally, the high-voltage ring network integrated machine and a booster converter integrated machine are integrated into an integrated structure.

[0022] The high-voltage switch cabinet, the energy storage incoming line cabinet, the PT cabinet, the metering cabinet and the energy storage grid-connected cabinet are located on the first side of the transformer room; the converter cabinet is located on the second side of the transformer room; the first side and the second side are oppositely arranged, and the first side and the second side are arranged along a first direction.

[0023] The low-voltage communication cabinet is located on the third side of the transformer room; the third side is adjacent to the first side and the second side, and the third side is located on one side of the low-voltage end of the main transformer.

[0024] Optionally, the high-voltage switch cabinet, the energy storage incoming line cabinet, the PT cabinet, the metering cabinet and the energy storage grid-connected cabinet located on the first side of the transformer room are arranged in sequence along a second direction, and the second direction is perpendicular to the first direction.

[0025] The high-voltage switch cabinet is located on one side of the energy storage incoming line cabinet close to the fourth side of the transformer room; the fourth side is adjacent to the first side and the second side, and the fourth side is located on one side of the high-voltage end of the main transformer.

[0026] Optionally, the converter cabinet further comprises a plurality of AC switches and a plurality of DC switches.

[0027] The plurality of AC switches and the plurality of DC switches are located below the converter, and the DC switches are located on one side of the AC switches away from the transformer room.

[0028] Optionally, the top of the converter cabinet is provided with a cover plate and a connecting column; the connecting column is used to install the cover plate on the top of the converter cabinet.

[0029] The utility model discloses a kind of high-voltage ring network integrated machine and boost converter integrated machine, and the high-voltage ring network integrated machine and boost converter integrated machine can be placed in any position of project site respectively, which is beneficial to the flexible installation of string type boost converter system, reduces land requirement, and the converter cabinet includes multiple string type converters, which is beneficial to reduce the volume of converter cabinet, save space and reduce land requirement. In addition, the energy storage incoming line cabinet can be electrically connected with one or more boost converter integrated machines, so that the high-voltage ring network integrated machine can be electrically connected with multiple boost converter integrated machines, realizing ring network function. When multiple boost converter integrated machines are needed, only one high-voltage ring network integrated machine is needed, without the need for additional construction of energy storage grid-connected cabinet, metering cabinet and PT cabinet, which can greatly reduce the land occupation and reduce construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structure schematic diagram of a string type boost converter system provided by an embodiment of the utility model;

[0031] Figure 2 is a technical scheme diagram of a converter cabinet provided by an embodiment of the utility model;

[0032] Figure 3 is a technical scheme diagram of a low-voltage communication cabinet provided by an embodiment of the utility model;

[0033] Figure 4 is a technical scheme diagram of a high-voltage switch cabinet and transformer room provided by an embodiment of the utility model;

[0034] Figure 5 is a technical scheme diagram of a high-voltage ring network integrated machine provided by an embodiment of the utility model;

[0035] Figure 6 is a top view structure diagram of a string type boost converter system provided by an embodiment of the utility model;

[0036] Figure 7 is a partial diagram of a technical scheme of a string type boost converter system provided by an embodiment of the utility model;

[0037] Figure 8 is a front view structure diagram of a string type boost converter system provided by an embodiment of the utility model;

[0038] Figure 9 is a side view structure diagram of a string type boost converter system provided by an embodiment of the utility model.

[0039] In the embodiments of the utility model, the reference signs and the corresponding feature names are as follows:

[0040] 10-high-voltage ring network all-in-one machine, 11-energy storage grid-connected cabinet, 12-metering cabinet, 13-PT cabinet, 14-energy storage incoming line cabinet, 141-incoming line branch;

[0041] 20-boosting converter all-in-one machine, 21-high-voltage switch cabinet, 22-transformer room, 23-low-voltage communication cabinet, 231-monitoring switch unit, 232-protection switch unit, 233-fire-fighting switch unit, 24-converter cabinet, 241-ac total switch room, 242-ac switch room, 243-dc switch room, 244-communication and control room, 25-converter rack system;

[0042] 30-cover plate, 31-connection column, 32-heat dissipation hollow structure;

[0043] 51-heat dissipation fan, 52-louvers, 53-dismountable fan cover. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The specific embodiments described herein are only used to explain the present application, rather than limit the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings, rather than all the structures. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0045] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. It should be noted that the "up", "down", "left", "right" and other directional words described in the embodiments of the present application are described with the angle shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, it should be understood in the context that when referring to an element formed "on" or "under" another element, it can be directly formed "on" or "under" another element, or indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second", etc. are only for the purpose of description, and do not represent any order, quantity or importance, but are only used to distinguish different components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] Figure 1 is a structural schematic diagram of a string type boosting converter system provided by the embodiments of the present application, referring toFigure 1 A string boost converter system includes: a high-voltage ring network integrated unit 10 and at least one boost converter integrated unit 20. The high-voltage ring network integrated unit 10 includes an energy storage grid-connected cabinet 11, a metering cabinet 12, a PT cabinet 13, and an energy storage incoming line cabinet 14, which are electrically connected in sequence. The boost converter integrated unit 20 includes a high-voltage switchgear 21, a transformer compartment 22, a low-voltage communication cabinet 23, and a converter cabinet 24, which are also electrically connected in sequence. The transformer compartment 22 includes a main transformer T1, and the converter cabinet 24 includes multiple converters (PCS). The energy storage incoming line cabinet 14 of the high-voltage ring network integrated unit 10 can be electrically connected to the high-voltage switchgear 21 of one or more boost converter integrated units 20.

[0047] The energy storage grid-connected cabinet 11 can connect the string boost converter system to the external power grid. The cabinet also protects the high-voltage ring network integrated unit 10 and the boost converter integrated unit 20 connected to its lower end. In case of a fault, the switch in the energy storage grid-connected cabinet 11 can be directly disconnected. In an optional embodiment, the external power grid can be the power grid of a power plant, a large factory, or a residential area. An energy storage access cabinet can be installed in the external power grid. Figure 1 (Not shown in the image), the energy storage grid-connected cabinet 11 can be electrically connected to the energy storage access cabinet in the external power grid. The metering cabinet 12 can meter and measure electrical energy, accurately recording and monitoring various parameters such as voltage and current for electricity billing. The metering cabinet 12 can also meter the entire string boost converter system for power supply settlement and power system management. The PT cabinet 13 can convert high-voltage signals to low-voltage signals, providing low-voltage signals for measuring equipment, instruments, and protection devices. Simultaneously, the PT cabinet 13 can monitor voltage status to prevent overvoltage or undervoltage. The energy storage incoming line cabinet 14 connects to one or more boost converter integrated units 20, converging the cables of these units at the energy storage incoming line cabinet 14 to achieve a ring network function.

[0048] The high-voltage switchgear 21 serves to protect the main transformer T1 in the transformer compartment 22 connected to the downstream end, protecting the main transformer T1 in the event of a fault in the line, and controlling the connection between the main transformer T1 in the transformer compartment 22 and the energy storage incoming cabinet 14. The transformer compartment 22 is used to boost the voltage on the low-voltage side to the upper-level energy storage access cabinet (…). Figure 1The voltage of the high-voltage side is reduced to the same voltage level as the low-voltage communication cabinet 23 and the converter cabinet 24 of the rear end, or the voltage required by the voltage level of the transformer room 22 is required, or the voltage of the high-voltage side is reduced to the same voltage level as the low-voltage communication cabinet 23 and the converter cabinet 24 of the rear end. The low-voltage communication cabinet 23 is used to realize the functions of data interaction between different devices, remote monitoring, system coordinated control, etc., for example, the low-voltage communication cabinet 23 can control the power supply of different devices, thereby controlling the working state of each device. The converter cabinet 24 is used to convert the direct current into alternating current to discharge the battery cabin, and can also convert alternating current into direct current to charge the battery cabin. Among them, the converter cabinet 24 can include a plurality of converters PCS, and the plurality of converters PCS can be connected in parallel to form a group string structure. The single converter PCS has a small size and can be stacked and arranged. Compared with a single power supply with large power and large size, the centralized converter saves more space and occupies less area.

[0049] Among them, the "low voltage" refers to the voltage of the low-voltage side of the main transformer T1 in the transformer room 22, and the "high voltage" refers to the voltage of the high-voltage side of the main transformer T1 in the transformer room 22. The "low voltage" and "high voltage" are not limited to a fixed range of voltage. In an optional embodiment, the "low voltage" in the present embodiment can be 690V, and the "high voltage" can be 10KV, but is not limited thereto.

[0050] For example, during discharging, the plurality of converters PCS in the converter cabinet 24 can convert the direct current output by the battery cabin into alternating current, and output alternating current with a voltage consistent with the voltage of the low-voltage end of the main transformer T1 in the transformer room 22 (for example, which can be 690V), and then flow to the low-voltage end of the main transformer T1 in the transformer room 22. The voltage is increased to the required voltage level (for example, which can be 10KV) by the main transformer T1, and then output through the high-voltage switch cabinet 21. The output cable of one or more booster converter integrated machines 20 can be gathered through the energy storage incoming line cabinet 14 to the high-voltage loop network integrated machine 10. The gathered high-voltage alternating current can pass through the energy storage incoming line cabinet 14, the PT cabinet 13, the metering cabinet 12 and the energy storage grid-connected cabinet 11 in turn, and finally be output to the corresponding energy storage access cabinet (not shown in the figure) in the station by the energy storage grid-connected cabinet 11. Figure 1

[0051] During charging, the high-voltage alternating current (for example, which can be 10KV) can be received through the energy storage grid-connected cabinet 11 first, and then pass through the metering cabinet 12, the PT cabinet 13 and the energy storage incoming line cabinet 14 in turn. The energy storage incoming line cabinet 14 can output to the branched booster converter integrated machine 20. The high-voltage switch cabinet 21 of the booster converter integrated machine 20 can transmit the divided high-voltage alternating current to the high-voltage end of the main transformer T1 in the transformer room 22. The voltage is reduced to the same voltage level as the alternating current end of the converter PCS (for example, which can be 690V) by the main transformer T1, and then the alternating current is converted into direct current by the plurality of converters PCS in the group string structure to charge the battery cabin. ​

[0052] The utility model embodiment provides a group string type boost converter system, the energy storage grid connected cabinet, the metering cabinet, PT cabinet and energy storage incoming line cabinet are integrated into the high voltage ring network integrated machine, and the high voltage switch cabinet, transformer room, low voltage communication cabinet and converter cabinet are integrated into the boost converter integrated machine, the high voltage ring network integrated machine and boost converter integrated machine can be placed at any position of project site respectively, which is favorable for flexible installation of the group string type boost converter system, reduces land requirement, and the converter cabinet comprises a plurality of group string type converters, which is favorable for reducing the size of the converter cabinet, saving space and reducing land requirement; in addition, the energy storage incoming line cabinet can be electrically connected with one or more boost converter integrated machines, so that the high voltage ring network integrated machine can be electrically connected with multiple boost converter integrated machines, realizes the ring network function, and when multiple boost converter integrated machines are needed, only one high voltage ring network integrated machine is needed, without the need of additionally constructing the energy storage grid connected cabinet, metering cabinet and PT cabinet, which can greatly reduce the land occupation and reduce construction cost.

[0053] Optionally, Figure 2 It is a technical scheme diagram of the converter cabinet provided by the utility model embodiment, referring to Figure 2 The direct current end of the plurality of converter PCSs is electrically connected with the plurality of battery clusters of the battery cabin respectively; the alternating current end of the plurality of converter PCSs is in parallel connection; and the alternating current end of the plurality of converter PCSs in parallel connection is electrically connected with the low voltage end of the main transformer T1.

[0054] For example, the converter cabinet 24 can include one or more converter rack systems 25, and taking the converter cabinet 24 including two converter rack systems 25 as an example, referring to Figure 2 Each converter rack system 25 can include a plurality of converter PCSs, and one converter PCS in the embodiment can correspond to one battery cluster, and one battery cluster can include a plurality of battery packs. The plurality of converter PCSs are in parallel connection on the alternating current side to form a group string type structure, and the plurality of parallel connection converter PCSs can form one converter rack system 25, and the plurality of converter PCSs in the converter rack system 25 are in parallel connection on the alternating current side and then output, and the boost converter integrated machine 20 can have two converter rack systems 25, and the two converter rack systems 25 can be in parallel connection and converge to the low voltage end of the main transformer T1 of the transformer room 22, and after boost by the main transformer T1, pass through the high voltage switch cabinet 21, the energy storage incoming line cabinet 14, the PT cabinet 13, the metering cabinet 12 and the energy storage grid connected cabinet 11, and then be connected to the energy storage access cabinet (not shown) in the factory area. Figure 2

[0055] In the optional embodiment, the converter cabinet 24 further includes a plurality of direct current switches QDC and a plurality of alternating current branch switches QAC, wherein the direct current switch QDC is arranged on the direct current side of the converter PCS, and the alternating current branch switch QAC is arranged on the alternating current side of the converter PCS; and the converter rack system 25 in the converter cabinet 24 further includes an alternating current total switch ABC.​

[0056] By adopting the technical scheme of the string type converter in the converter cabinet 24, each battery cluster can be connected with a single converter PCS, each converter PCS can charge / discharges and protection control a single battery cluster, the system consistency is increased, the charge / discharge capacity of the system is improved, and the problem of low online rate of equipment after failure is reduced.

[0057] Optionally, Figure 3 is a technical scheme of a low-voltage communication cabinet provided by an embodiment of the utility model, and a schematic diagram is shown in Figure 3 The low-voltage communication cabinet 23 comprises an auxiliary transformer T2, a monitoring switch unit 231, a protection switch unit 232 and a fire-fighting switch unit 233. The high-voltage end of the auxiliary transformer T2 is electrically connected with the low-voltage end of the main transformer T1, and the low-voltage end of the auxiliary transformer T2 is electrically connected with the monitoring switch unit 231. The low-voltage communication cabinet 23 further comprises an uninterruptible power supply UPS and a dual power supply transfer switch ATS. The input end of the uninterruptible power supply UPS is electrically connected with the monitoring switch unit 231, and the output end of the uninterruptible power supply UPS is electrically connected with the protection switch unit 232. The first input end of the dual power supply transfer switch ATS is electrically connected with the monitoring switch unit 231, the second input end of the dual power supply transfer switch ATS is electrically connected with an external power supply, and the output end of the dual power supply transfer switch ATS is electrically connected with the fire-fighting switch unit 233.

[0058] The auxiliary transformer T2 is used for converting the voltage of the low-voltage end of the main transformer T1 or the alternating voltage output by the converter cabinet 24 into a voltage suitable for the low-voltage communication cabinet 23. The monitoring switch unit 231 is used for monitoring and controlling the working state of the basic equipment. The protection switch unit 232 is used for monitoring and controlling the working state of the protection equipment. The fire-fighting switch unit 233 is used for monitoring and controlling the working state of the fire-fighting equipment.

[0059] For example, the monitoring switch unit 231 includes a plurality of switches (Q11, Q12, Q13, Q14, Q15,..., Q01, Q02), and the plurality of switches of the monitoring switch unit 231 can respectively control each battery compartment, each backup power supply, each rack system 25 of the converter, a radiator power supply, an illumination power supply, a wall plug power supply, an uninterruptible power supply (UPS), an automatic transfer switch (ATS), and the like, so as to monitor and control the working state of each device. The protection switch unit 232 also includes a plurality of switches (Q21, Q22, Q23, Q24, Q25), and the plurality of switches of the protection switch unit 232 can respectively control a high-voltage operation power supply, a communication device power supply, a measurement and control protection power supply, a smoke sensing power supply, an electrical machine room power supply, and the like, so as to monitor and control the working state of the protection device. The fire-fighting switch unit 233 also includes a plurality of switches (Q31, Q32, Q33), and the plurality of switches of the protection switch unit 232 can respectively control the fire-fighting power supply of each integrated machine and battery compartment, so as to monitor and control the working state of the fire-fighting device.

[0060] In an optional embodiment, the low-voltage communication cabinet 23 can further include a first molded case circuit breaker QF1 and a second molded case circuit breaker QF2, the first molded case circuit breaker QF1 can be arranged at the high-voltage end of the auxiliary transformer T2, and the second molded case circuit breaker QF2 can be arranged at the low-voltage end of the auxiliary transformer T2.

[0061] In yet another optional embodiment, the low-voltage communication cabinet 23 further includes a multifunctional electric meter MMU and a communication current transformer CT1, and the multifunctional electric meter MMU and the communication current transformer CT1 can be arranged at the low-voltage end of the auxiliary transformer T2.

[0062] In yet another optional embodiment, the low-voltage communication cabinet 23 can further be provided with a fuse (FU01-03, FU04-06) and a surge protector (SPD1, SPD2) at the high-voltage end of the auxiliary transformer T2 and the external power supply end.

[0063] Optionally, Figure 4 is a technical scheme diagram of a high-voltage switch cabinet and a transformer room provided by an embodiment of the present application, referring to Figure 4 The high-voltage switch cabinet 21 includes a high-voltage circuit breaker ZN1, a high-voltage disconnector QS1, and a high-voltage current transformer CT3. The first end of the high-voltage circuit breaker ZN1 is electrically connected to the transformer room 22 through the high-voltage disconnector QS1, and the second end of the high-voltage circuit breaker ZN1 is electrically connected to the energy storage incoming line cabinet 14; the high-voltage current transformer CT3 is arranged between the high-voltage disconnector QS1 and the transformer room 22.

[0064] For example, the high-voltage circuit breaker ZN1 can be a vacuum circuit breaker, the high-voltage disconnector QS1 can be an isolation / grounding switch, and the high-voltage current transformer CT3 can be two groups of three-phase current transformers, so as to realize overcurrent protection and backup protection.

[0065] In an optional embodiment, the high-voltage switch cabinet 21 can further be provided with a back-connected lightning arrester FB and a live display GSN, wherein the live display GSN can be composed of a capacitor and a ground indicating lamp.

[0066] In yet another optional embodiment, with continued reference to Figure 4 , the transformer room 22 can further include a low-voltage current transformer CT2, which can be arranged at the low-voltage end of the main transformer T1.

[0067] Optionally, Figure 5 is a technical scheme diagram of a high-voltage ring network integrated machine provided by an embodiment of the present application, with reference to Figure 5 The energy storage incoming line cabinet 14 includes at least one incoming line branch 141. When the energy storage incoming line cabinet 14 includes multiple incoming line branches 141, the first end of the incoming line branch 141 is electrically connected to the high-voltage switch cabinet 21, and the second end of the incoming line branch 141 is in parallel connection. The second end of the incoming line branch 141 after the parallel connection is electrically connected to the PT cabinet 13.

[0068] Specifically, one incoming line branch 141 can be connected to one voltage boosting current integrated machine 20, so that one high-voltage ring network integrated machine 10 can be connected to multiple voltage boosting current integrated machines 20.

[0069] On the basis of the above-mentioned embodiments, the incoming line branch 141 includes an incoming line circuit breaker ZN2, an incoming line disconnector QS2, and an incoming line current transformer CT4. The first end of the incoming line circuit breaker ZN2 is electrically connected to the high-voltage switch cabinet 21 through the incoming line disconnector QS2, and the second end of the incoming line circuit breaker ZN2 is electrically connected to the PT cabinet 13. The incoming line current transformer CT4 is arranged between the incoming line disconnector QS2 and the high-voltage switch cabinet 21.

[0070] For example, the incoming line circuit breaker ZN2 can be a vacuum circuit breaker, the incoming line disconnector QS2 can be an isolation / grounding switch, and the incoming line current transformer CT4 can be two sets of three-phase current transformers to realize overcurrent protection and standby protection. In an optional embodiment, the incoming line branch 141 can further be provided with a back-connected lightning arrester FB and a live display GSN.

[0071] Optionally, with continued reference to Figure 5The PT cabinet 13 includes a voltage monitoring switch QC, a load / switching-off switch QL and a first voltage transformer PT1. The first end of the voltage monitoring switch QC is electrically connected with the energy storage incoming line cabinet 14 and the metering cabinet 12, the second end of the voltage monitoring switch QC is electrically connected with the first voltage transformer PT1 through the load / switching-off switch QL, and a first high-voltage fuse HVFU1 can be arranged between the load / switching-off switch QL and the first voltage transformer PT1. The first voltage transformer PT1 can be a three-winding voltage transformer. In an optional embodiment, the PT cabinet 13 can further be provided with a post-arranged arrester FB and a live display GSN.

[0072] Optionally, with continued reference to Figure 5 The metering cabinet 12 includes a metering current transformer CT0, and can further include a second voltage transformer PT2, a second high-voltage fuse HVFU2 and a live display GSN. The second voltage transformer PT2 can be a two-winding voltage transformer.

[0073] Optionally, with continued reference to Figure 5 The energy storage grid-connected cabinet 11 includes a grid-connected circuit breaker ZN3, a grid-connected switching-off switch QS3 and a grid-connected current transformer CT5. The first end of the grid-connected circuit breaker ZN3 is electrically connected with the front-end energy storage access cabinet (not shown in the figure) through the grid-connected switching-off switch QS3, and the second end of the grid-connected circuit breaker ZN3 is electrically connected with the metering cabinet 12. Figure 5 The grid-connected current transformer CT5 is arranged between the grid-connected switching-off switch QS3 and the front-end energy storage access cabinet (not shown in the figure). Figure 5

[0074] Illustratively, the grid-connected circuit breaker ZN3 can be a vacuum circuit breaker, the grid-connected switching-off switch QS3 can be an isolation / grounding switch, and the grid-connected current transformer CT5 can be a three-group three-phase current transformer, so as to realize overcurrent protection, standby protection and redundancy protection, thereby realizing high-reliability and high-precision overcurrent protection. In an optional embodiment, the energy storage grid-connected cabinet 11 can further be provided with a post-arranged arrester FB and a live display GSN. In yet another optional embodiment, the energy storage grid-connected cabinet 11 can further be provided with a zero-sequence current transformer IO for detecting zero-sequence current, identifying ground fault and asymmetric fault, thereby triggering the action of a protection device, and ensuring system safety and personal safety.

[0075] In an optional embodiment, with continued reference to Figure 5 ​Alternatively, copper rods (TMY) can be used to connect different cabinets of the high-voltage ring network integrated unit 10. For example, copper rods (TMY) can be installed between the energy storage grid connection cabinet 11 and the metering cabinet 12, between the metering cabinet 12 and the PT cabinet 13, and between the PT cabinet and the energy storage incoming line cabinet 14. In an optional embodiment, when the energy storage incoming line cabinet 14 and the high-voltage cabinet 21 are arranged adjacent to each other, copper rods (TMY) can also be installed between the energy storage incoming line cabinet 14 and the high-voltage cabinet 21. The copper rods (TMY) are relatively hard, which is beneficial for achieving proper connection between the copper rods (TMY) and the cabinet openings (…). Figure 5 (Not shown) The seal allows for the filling of the cabinet with gas, improving the insulation, safety, and reliability of the equipment inside the cabinet. This also helps to reduce the volume of the cabinet and its internal equipment, thus reducing the space occupied by the cabinet. In an optional embodiment, the cabinet can be filled with sulfur hexafluoride gas.

[0076] Optional, Figure 6 This is a top view schematic diagram of a string boost converter system provided in an embodiment of this utility model, for reference. Figure 6 The high-voltage ring network integrated unit 10 and the step-up converter integrated unit 20 are integrated into a single structure. The high-voltage switchgear 21, energy storage incoming line cabinet 14, PT cabinet 13, metering cabinet 12, and energy storage grid-connected cabinet 11 are all located on the first side SI1 of the transformer room 22, and the converter cabinet 24 is located on the second side SI2 of the transformer room 22. The first side SI1 and the second side SI2 are arranged opposite each other along the first direction X. The low-voltage communication cabinet 23 is located on the third side SI3 of the transformer room 22, adjacent to both the first side SI1 and the second side SI2, and located on the low-voltage side of the main transformer T1. This design facilitates the isolation of the high-voltage and low-voltage cabinets, improves safety, reduces electromagnetic interference, lowers isolation costs, reduces the land resources required for isolation, and optimizes space and system heat dissipation.

[0077] It is understood that other integrated step-up converters 20 can still continue to be connected to the energy storage incoming line cabinet 14 in the integrated structure. Other integrated step-up converters 20 can be located in different positions from the integrated structure, or they can be placed in the same position. This embodiment does not limit this.

[0078] In an optional implementation, Figure 7 This is a partial schematic diagram of a string boost converter system provided in an embodiment of this utility model. (Refer to...) Figure 7 When the high-voltage ring network integrated unit 10 and the step-up converter integrated unit 20 are integrated into a single structure, the high-voltage switchgear 21 in the integrated structure can be reused as an incoming branch 141.

[0079] For example, refer to Figure 7When the high-voltage ring network integrated machine 10 and one step-up current conversion integrated machine 20 are integrated into an integrated structure, the high-voltage switch cabinet 21 in the integrated structure can be reused as an incoming line branch 141, at this time, one incoming line branch 141 can be less set in the energy storage incoming line cabinet 14, thus, it is beneficial to reduce the volume of the energy storage incoming line cabinet 14, reduce the space occupation, and improve the land resource utilization rate.

[0080] It should be noted that when the high-voltage switch cabinet 21 in the integrated structure is reused as an incoming line branch 141, at least one incoming line branch 141 still needs to be set in the energy storage incoming line cabinet 14 to realize the connection with other step-up current conversion integrated machines 20 through the incoming line branch 141 in the energy storage incoming line cabinet 14, so as to realize the centralized control of the connection between the high-voltage ring network integrated machine 10 and other step-up current conversion integrated machines 20.

[0081] On the basis of the above-mentioned embodiments, continuing to refer to Figure 6 , the high-voltage switch cabinet 21, the energy storage incoming line cabinet 14, the PT cabinet 13, the metering cabinet 12 and the energy storage grid-connected cabinet 11 located at the first side SIl of the transformer room 22 are arranged in the second direction Y in sequence, the second direction Y is perpendicular to the first direction X, and the high-voltage switch cabinet 21 is located at the side of the energy storage incoming line cabinet 14 close to the fourth side SI4 of the transformer room 22; the fourth side SI4 is adjacent to the first side SIl and the second side SI2 at the same time, and the fourth side SI4 is located at the side of the high-voltage end of the main transformer T1. Thus, it is beneficial to cable connection, reduce the wiring length, save space, and improve the land resource utilization rate.

[0082] In an optional embodiment, Figure 8 is a front view structural diagram of a string type step-up current conversion system provided by the utility model embodiments, referring to Figure 2 , Figure 6 and Figure 8 , the current conversion cabinet 24 further includes a plurality of alternating current switches QAC and a plurality of direct current switches QDC, the plurality of alternating current switches QAC and the plurality of direct current switches QDC are all located below the current converter PCS, and the direct current switch QDC is located at the side of the alternating current switch QAC away from the transformer room 22.

[0083] Exemplarily, referring to Figure 2 , Figure 6 and Figure 8The converter cabinet 24 further comprises an AC main switch room 241, an AC switch room 242 and a DC switch room 243, the AC main switch ABC can be arranged in the AC main switch room 241, the AC switch QAC can be arranged in the AC switch room 242, and the DC switch QDC can be arranged in the DC switch room 243. In the direction Z perpendicular to the ground, the converter PCS can be located on the side of the AC main switch room 241, the AC switch room 242 and the DC switch room 243 away from the ground, which is conducive to heat dissipation of the converter PCS. The DC switch room 243 is located on the side close to the ground and away from the transformer room 22, which is conducive to the DC switch QDC being electrically connected to the external battery cabin through the wiring hole H01 of the electrostatic floor D01, reducing the wiring length, saving space and improving the land utilization rate.

[0084] In an optional embodiment, the converter cabinet 24 further comprises a communication and control room 244, which can be arranged below the converter PCS and on the side of the DC switch room 243 away from the transformer room 22.

[0085] In yet another optional embodiment, Figure 9 is a side view structural schematic diagram of a string type boost converter system provided by the utility model, referring to Figure 8 and Figure 9 The top of the converter cabinet 24 is provided with a cover plate 30 and a connecting column 31; the connecting column 31 is used for mounting the cover plate 30 on the top of the converter cabinet 24.

[0086] Illustratively, the different connecting columns 31 can not be connected, and no other structures are arranged, the heat generated by the converter PCS can be released through the gap between the connecting columns 31, and the cover plate 30 can be used to block dust or fallen leaves from entering the converter PCS.

[0087] In other optional embodiments, the heat dissipation hollow structure 32 can be arranged on part of the cabinet doors of the AC main switch room 241, the AC switch room 242, the DC switch room 243 and the communication and control room 244, for heat dissipation of the switch rooms.

[0088] In yet another optional embodiment, referring to Figure 6 , Figure 8 and Figure 9 The cabinet door of the low-voltage communication cabinet 23 is further provided with a heat dissipation fan 51 and a louver 52, and a detachable fan cover 53 can be further arranged outside the heat dissipation fan 51.

[0089] In yet another optional embodiment, continuing to refer to Figure 6 , Figure 8 and Figure 9The transformer room 22 can also be provided with a cooling fan 51 and louvers (not shown in the figure). The cooling fan 51 of the transformer room 22 can be located directly above the cabinet door of the low-voltage communication cabinet 23, i.e. in the direction Z perpendicular to the ground, the height of the transformer room 22 is greater than the height of the low-voltage communication cabinet 23, and the space above the low-voltage communication cabinet 23 can be in air communication with the transformer room 22. The louvers of the transformer room 22 can be provided on the cabinet door of the transformer room 22 (not shown in the figure), the cabinet door of the transformer room 22 can be provided on the fourth side SI4 of the transformer room 22, and the louvers of the transformer room 22 can be located at the lower position of the cabinet door of the transformer room 22, which is diagonally opposite to the cooling fan 51 of the transformer room 22 located on the third side SI3 of the transformer room 22, which is conducive to the air entering the transformer room 22 from the louvers (not shown in the figure) on the fourth side SI4 of the transformer room 22 and flowing out of the transformer room 22 from the multiple cooling fans 51 located at the upper position of the third side SI3 of the transformer room 22, accelerating the air circulation and heat exchange in the transformer room 22, uniformly reducing the temperature around the main transformer T1, and improving the reliability. In addition, a detachable air cover 53 can also be provided outside the cooling fan 51 of the transformer room 22.

[0090] It should be noted that the above is only the preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments, mutual combinations and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can 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 string boost converter system, characterized in that, include: High-voltage ring network integrated unit and at least one step-up converter integrated unit; The high-voltage ring network integrated unit includes an energy storage grid-connected cabinet, a metering cabinet, a PT cabinet, and an energy storage incoming line cabinet, which are electrically connected in sequence. The integrated step-up converter includes a high-voltage switchgear, a transformer compartment, a low-voltage communication cabinet, and a converter cabinet, which are electrically connected in sequence; wherein, the transformer compartment includes a main transformer, and the converter cabinet includes multiple converters; The energy storage incoming cabinet of the high-voltage ring network integrated machine can be electrically connected to the high-voltage switch cabinet of one or more of the step-up converter integrated machines.

2. The string boost converter system according to claim 1, characterized in that, The DC terminals of the multiple converters are electrically connected to multiple battery clusters in the battery compartment, respectively; the AC terminals of the multiple converters are connected in parallel. The AC terminals of the multiple converters connected in parallel are electrically connected to the low-voltage terminal of the main transformer.

3. The string boost converter system according to claim 1, characterized in that, The low-voltage communication cabinet includes an auxiliary transformer, a monitoring switch unit, a protection switch unit, and a fire protection switch unit; The high-voltage end of the auxiliary transformer is electrically connected to the low-voltage end of the main transformer, and the low-voltage end of the auxiliary transformer is electrically connected to the monitoring switch unit. The low-voltage communication cabinet also includes an uninterruptible power supply (UPS) and a dual-power transfer switch; the input terminal of the UPS is electrically connected to the monitoring switch unit, and the output terminal of the UPS is electrically connected to the protection switch unit; the first input terminal of the dual-power transfer switch is electrically connected to the monitoring switch unit, the second input terminal of the dual-power transfer switch is electrically connected to an external power source, and the output terminal of the dual-power transfer switch is electrically connected to the fire protection switch unit.

4. The string boost converter system according to claim 1, characterized in that, The high-voltage switchgear includes high-voltage circuit breakers, high-voltage disconnect switches, and high-voltage current transformers. The first end of the high-voltage circuit breaker is electrically connected to the transformer room through the high-voltage disconnect switch, and the second end of the high-voltage circuit breaker is electrically connected to the energy storage incoming line cabinet; the high-voltage current transformer is located between the high-voltage disconnect switch and the transformer room.

5. The string boost converter system according to claim 1, characterized in that, The energy storage incoming line cabinet includes at least one incoming line branch; When the energy storage incoming line cabinet includes multiple incoming line branches, the first end of the incoming line branch is electrically connected to the high-voltage switch cabinet, the second end of the incoming line branch is connected in parallel, and the second end of the parallel incoming line branch is electrically connected to the PT cabinet.

6. The string boost converter system according to claim 5, characterized in that, The incoming branch includes an incoming circuit breaker, an incoming disconnect switch, and an incoming current transformer; The first end of the incoming line circuit breaker is electrically connected to the high-voltage switchgear via the incoming line disconnect switch, and the second end of the incoming line circuit breaker is electrically connected to the PT cabinet; the incoming line current transformer is disposed between the incoming line disconnect switch and the high-voltage switchgear.

7. The string boost converter system according to claim 1, characterized in that, The high-voltage ring network integrated machine and the step-up converter integrated machine are integrated into a single structure; The high-voltage switchgear, the energy storage incoming line cabinet, the PT cabinet, and the metering cabinet are all located on the first side of the transformer room; the converter cabinet is located on the second side of the transformer room; the first side and the second side are arranged opposite to each other, and the first side and the second side are arranged along a first direction; The low-voltage communication cabinet is located on the third side of the transformer room; the third side is adjacent to both the first side and the second side, and the third side is located on the low-voltage side of the main transformer.

8. The string boost converter system according to claim 7, characterized in that, The high-voltage switchgear, the energy storage incoming line cabinet, the PT cabinet, the metering cabinet, and the energy storage grid-connected cabinet located on the first side of the transformer room are arranged in sequence along the second direction, which is perpendicular to the first direction. The high-voltage switchgear is located on the fourth side of the energy storage incoming cabinet, which is close to the transformer room; the fourth side is adjacent to both the first side and the second side, and is located on the high-voltage side of the main transformer.

9. The string boost converter system according to claim 7, characterized in that, The converter cabinet also includes multiple AC switches and multiple DC switches; The multiple AC switches and the multiple DC switches are all located below the converter, and the DC switches are located on the side of the AC switches away from the transformer compartment.

10. The string boost converter system according to claim 9, characterized in that, The top of the converter cabinet is provided with a cover plate and a connecting column; the connecting column is used to install the cover plate on the top of the converter cabinet.

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