Installation and connection structure of primary device of micro-grid battery energy storage integrated device

Abstract

The utility model discloses a mounting and connecting structure of a primary device of a micro-grid battery energy storage integrated device. A machine frame is formed by welding a front plate, a rear panel, a right side plate, a left side plate, a right partition plate, a left partition plate and a middle partition plate; the machine frame is longitudinally divided into an alternating-current box, a converter box and a direct-current box by the right partition plate and the left partition plate; the middle partition plate is short and is connected with the rear panel, and the converter box is transversely divided into an upper converter chamber, a lower converter chamber and a front converter chamber; the machine frame is provided with an upper cover plate and a lower cover plate. A filter reactor plate is installed in the upper converter chamber, an energy storage capacitor plate is installed in the lower converter chamber, a radiator substrate is installed in the front converter chamber, longitudinal cooling fins are installed on the radiator substrate, A-phase, B-phase and C-phase primary converter IGBT tubes are installed below the radiator substrate from right to left or from left to right, and the IGBT tubes are located in the middle of the front converter chamber in the horizontal direction. According to the utility model, the 5S integration of PCS, BMS, FMS, PMS and EMS devices of the micro-grid battery energy storage equipment is realized.

Description

Technical Field

[0001] The utility model relates to an installation and connection structure of primary devices of a microgrid battery energy storage integrated device. Background Art

[0002] The main function of a battery energy storage device is to use a battery as the main body to store electric energy when the grid electric energy is rich or surplus and release electric energy when the grid electric energy is in short supply, that is, to cut peaks and fill valleys of the grid electric energy. It is widely used in wind power plants, solar power plants and power consumption scenarios with large differences between peak and valley power consumption, and is a new energy industry that is an important part of the new power system.

[0003] Microgrid battery energy storage devices generally adopt a cabinet form, with a power of hundreds of kilowatts and a stored electric energy of hundreds of kilowatt-hours (degrees). They belong to medium and small-sized energy storage devices and are suitable for power regulation of industrial and commercial power users and public distribution substations.

[0004] In addition to the batteries for storing electric energy in the microgrid battery energy storage device cabinet, there are also PCS devices of a bidirectional conversion system that convert grid AC electric energy into DC electric energy and convert battery DC electric energy into AC electric energy, BMS devices for managing the safe and economic operation of energy storage batteries, FMS devices for managing the reliable operation of energy storage batteries and the fire protection system in the cabinet, PMS devices for managing the safe and reliable operation of the equipment AC power distribution power supply and DC working power supply, and EMS devices for managing the safe and economic operation of the energy storage battery charge and discharge electric energy, the equipment storage and generation electric energy, and the distribution power supply and transmission electric energy.

[0005] The existing PCS, BMS, FMS, PMS, and EMS (also known as 5S) devices in microgrid battery energy storage devices are all independent and decentralized or partially combined. Therefore, the equipment has problems such as complex structure, large volume, high cost, poor reliability, and difficult operation and maintenance.

[0006] There are primary devices with large volume, large weight, high voltage, and large current in the PCS, BMS, FMS, PMS, and EMS ("5S") of the microgrid battery energy storage device. The main difficulty in integrating the "5S" is the reasonable and scientific installation and connection of the primary devices in the "5S". Summary of the Invention

[0007] The purpose of the utility model is to provide an installation and connection structure of primary devices of a microgrid battery energy storage integrated device that determines the installation and connection scheme according to the functional characteristics, mutual relevance, and connection simplicity of the primary devices in the PCS, BMS, FMS, PMS, and EMS, and designs the frame for installing the primary devices accordingly, so as to realize the "5S" integration of the PCS, BMS, FMS, PMS, and EMS devices of the microgrid battery energy storage device.

[0008] The technical solution of the present utility model is as follows:

[0009] An installation and connection structure of primary devices of a microgrid battery energy storage integrated device, characterized in that it includes: 1 steel frame, which is formed by welding a front plate, a rear panel, a right side plate, a left side plate, a right partition, a left partition, and a middle partition; the right partition and the left partition longitudinally divide the frame into an AC box, a converter box, and a DC box; the middle partition is shorter and is connected to the rear panel, and transversely divides the converter box into an upper converter chamber, a lower converter chamber, and a front converter chamber; the frame has an upper cover plate and a lower cover plate.

[0010] A filter reactor board is installed in the upper converter chamber, a energy storage capacitor board is installed in the lower converter chamber, and a radiator substrate is installed in the front converter chamber. Longitudinal heat sinks are installed on the upper surface of the radiator substrate, and A-phase, B-phase, and C-phase primary converter devices IGBT tubes are installed from right to left or from left to right below the radiator substrate. The IGBT tubes are horizontally located in the middle of the front converter chamber, facilitating connection with the filter reactor board and the energy storage capacitor board.

[0011] AC A-phase, B-phase, and C-phase connection terminals are installed on the outer surface of the rear panel corresponding to the AC chamber; a three-phase AC circuit breaker, A-phase, B-phase, and C-phase fuses, and overvoltage protectors are installed behind the front panel; the AC circuit breaker has A-phase, B-phase, and C-phase access terminals and A-phase, B-phase, and C-phase output terminals, and the overvoltage protector has A-phase, B-phase, and C-phase access terminals and output terminals; the A-phase, B-phase, and C-phase connection terminals are respectively connected to the A-phase, B-phase, and C-phase access terminals of the AC circuit breaker, the A-phase, B-phase, and C-phase output terminals of the AC circuit breaker are respectively connected to one end of the A-phase, B-phase, and C-phase fuses, and the A-phase, B-phase, and C-phase access sections of the overvoltage protector are respectively connected to the A-phase, B-phase, and C-phase output terminals of the AC circuit breaker; there is a grounding point on the frame, and the grounding point is connected to the output terminal of the overvoltage protector.

[0012] DC V+ and V- connection terminals are installed on the outer surface of the rear panel corresponding to the DC chamber, and a bipolar DC circuit breaker, DC fuses, DC relays, and DC shunt / sensors are installed behind the front panel; the DC circuit breaker has a V+ access terminal, a V- access terminal, a V+ output terminal, and a V- output terminal. The V+ and V- connection terminals are respectively connected to the V+ and V- access terminals of the DC circuit breaker; the V+ output terminal or the V- output terminal of the DC circuit breaker is connected to one end of the DC fuse; one end of the DC relay is connected to the other end of the DC fuse or the V- output terminal or the V+ output terminal, and one end of the DC shunt / sensor is connected to the other end of the DC relay or the other end of the fuse or the V+ output terminal or the V- output terminal, forming a V+ output terminal extended circuit and a V- output terminal extended circuit.

[0013] On the filter reactor board, the A-phase, B-phase, and C-phase reactance circuits are arranged longitudinally. Each phase's reactance circuit has primary devices including a large reactor and a small reactor; on the capacitor board, there are no less than 20 primary device energy storage capacitors. The energy storage capacitors are divided into a +-pole capacitor group and a - -pole capacitor group with the same quantity. On the capacitor board, there are +-pole copper foils, N-pole copper foils, and - -pole copper foils; for each phase's IGBT tube, there are IGBT +-extreme, IGBT N-extreme, IGBT - -extreme, and IGBT S-extreme. The S-extremes of the A-phase, B-phase, and C-phase IGBT tubes are respectively connected to one end of the large reactors in the A-phase, B-phase, and C-phase reactance circuits. The other end of the large reactor is connected to one end of the small reactor; the +-extremes, N-extremes, and - -extremes of the A-phase, B-phase, and C-phase IGBT tubes are respectively connected to the +-pole copper foil, N-pole copper foil, and - -pole copper foil at the front part of the energy storage capacitor board; the energy storage capacitors have +-poles and - -poles. The positive and negative electrodes of the energy storage capacitors in the +-pole capacitor group are respectively connected to the +-pole copper foil and the N-pole copper foil, and the positive and negative electrodes of the energy storage capacitors in the - -pole capacitor group are respectively connected to the N-pole copper foil and the - -pole copper foil.

[0014] The other ends of the small reactors in the A-phase, B-phase, and C-phase reactance circuits in the converter box respectively use connecting copper parts to pass through the right partition and are connected to the other ends of the A-phase, B-phase, and C-phase fuses in the AC box; the parts of the +-pole and - -pole copper foils of the energy storage capacitor board in the converter box near the rear panel respectively use connecting copper parts to pass through the left partition and are respectively connected to the ends of the extended circuits of the V+ and V- output terminals of the DC circuit breaker in the DC box.

[0015] The present utility model determines the installation and connection scheme according to the functional characteristics, mutual relevance, and connection simplicity of the primary devices in PCS, BMS, FMS, PMS, and EMS (5S), and conducts the frame design for installing the primary devices accordingly, realizing the "5S" integration of the PCS, BMS, FMS, PMS, and EMS devices of the microgrid battery energy storage equipment, and having the characteristics of simple and compact structure, convenient production and operation and maintenance, reliable performance, and low cost. Description of the Drawings

[0016] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0017] Figure 1 It is the front top view of an embodiment of the present utility model.

[0018] Figure 2 It is the front bottom view of an embodiment of the present utility model.

[0019] Figure 3 of Figure 1 A-A view.

[0020] Figure 4 It is a schematic diagram of the IGBT tube.

[0021] Reference Signs:

[0022] 001 - Cabinet

[0023] 002 - Front Panel

[0024] 003 - Rear Panel

[0025] 004 - Right Side Panel

[0026] 005 - Left Side Panel

[0027] 006 - Right Partition

[0028] 007 - Left Partition

[0029] 008 - Middle Partition

[0030] 012 - AC Box

[0031] 013 - Converter Box

[0032] 014 - DC Box

[0033] 015 - Upper Converter Chamber

[0034] 016 - Lower Converter Chamber

[0035] 017 - Front Converter Chamber

[0036] 018 - Upper Cover Plate

[0037] 019 - Lower Cover Plate

[0038] 101 - Filter Reactor Plate

[0039] 102 - Energy Storage Capacitor Plate

[0040] 104 - Radiator Substrate

[0041] 105 - Heat Sink

[0042] 106 - Phase A IGBT Tube

[0043] 107 - Phase B IGBT Tube

[0044] 108 - Phase C IGBT Tube

[0045] 109 - Phase A Reactance Circuit

[0046] 110 - Phase B Reactance Circuit

[0047] 111 - Phase C Reactance Circuit

[0048] 112 - Large Reactor

[0049] 113 - Small Reactor

[0050] 114 - Energy Storage Capacitor

[0051] 115 — Positive capacitor bank

[0052] 116 — Negative capacitor bank

[0053] 117 — Positive copper foil

[0054] 118 — N - pole copper foil

[0055] 119 — Negative copper foil

[0056] 120 — IGBT positive terminal

[0057] 121 — IGBT N - terminal

[0058] 122 — IGBT negative terminal

[0059] 123 — IGBT S - terminal

[0060] 201 — Phase - A connection terminal

[0061] 202 — Phase - B connection terminal

[0062] 203 — Phase - C connection terminal

[0063] 205 — Three - phase AC circuit breaker

[0064] 206 — Phase - A fuse

[0065] 207 — Phase - B fuse

[0066] 208 — Phase - C fuse

[0067] 209 — Over - voltage protector

[0068] 210 — AC circuit breaker Phase - A access terminal

[0069] 211 — AC circuit breaker Phase - B access terminal

[0070] 212 — AC circuit breaker Phase - C access terminal

[0071] 213 — AC circuit breaker Phase - A output terminal

[0072] 214 — AC circuit breaker Phase - B output terminal

[0073] 215 — AC circuit breaker Phase - C output terminal

[0074] 216 — Over - voltage protector Phase - A access terminal

[0075] 217 — Over - voltage protector Phase - B access terminal

[0076] 218 — Over - voltage protector Phase - C access terminal

[0077] 220—Outlet of overvoltage protector

[0078] 221—Grounding point

[0079] 301—V+ terminal

[0080] 302—V− terminal

[0081] 303—DC circuit breaker

[0082] 304—DC fuse

[0083] 305—DC relay

[0084] 306—DC shunt / sensor

[0085] 309—V+ access terminal of DC circuit breaker

[0086] 310—V− access terminal of DC circuit breaker

[0087] 311—V+ outlet terminal of DC circuit breaker

[0088] 312—V− outlet terminal of DC circuit breaker

[0089] 313—Circuit extending after V+ outlet terminal

[0090] 314—Circuit extending after V− outlet terminal

[0091] 315—End of the extending circuit Detailed implementation manners

[0092] An installation and connection structure of primary devices of a microgrid battery energy storage integrated device, comprising: 1 steel frame 001, and the frame 001 is formed by welding a front plate 002, a rear panel 003, a right side plate 004, a left side plate 005, a right partition 006, a left partition 007, and a middle partition 008. The right partition 006 and the left partition 007 longitudinally divide the frame 001 into an AC box 012, a converter box 013, and a DC box 014. The middle partition 008 is shorter and is connected to the rear panel 003, and transversely divides the converter box 013 into an upper converter chamber 015, a lower converter chamber 016, and a front converter chamber 017. The frame 001 has an upper cover plate 018 and a lower cover plate 019.

[0093] The primary devices in the 5S integrated device are separately installed in the AC box, converter box, and DC box according to their functional characteristics, heat generation, and electromagnetic compatibility characteristics. The converter box is further divided into an upper converter chamber, a lower converter chamber, and a front converter chamber. At the same time, according to the main functions of AC → converter → DC and DC → converter → AC in the 5S integrated device, the AC box and DC box are placed on both sides of the converter box. The right partition 006, left partition 007, and middle partition 008 serve the functions of space separation, installation of primary devices, heat insulation, and electromagnetic interference isolation. Therefore, it not only has a simple and compact structure, is easy to produce, operate, and maintain, and has low costs, but also has good temperature performance and electromagnetic compatibility performance, ensuring reliable operation.

[0094] A filter reactor board 101 is installed in the upper converter chamber 015, a energy storage capacitor board 102 is installed in the lower converter chamber 016, and a radiator substrate 104 is installed in the front converter chamber 017. Longitudinal heat sinks 105 are installed on the upper surface of the radiator substrate 104. A-phase, B-phase, and C-phase primary converter devices IGBT tubes 106, 107, and 108 are installed on the lower surface of the radiator substrate 104 from right to left or from left to right. The IGBT tubes 106, 107, and 108 are located in the middle of the front converter chamber 017 in the horizontal direction, facilitating connection with the filter reactor board 101 and the energy storage capacitor board 102.

[0095] The primary devices on the filter reactor board 101 generate a large amount of heat, so they are installed in the upper converter chamber. The primary devices on the energy storage capacitor board generate very little heat, so they are installed in the lower converter chamber. The IGBT is the main heat-generating body, and most of the heat is transferred to the heat sink. The heat sink is located in the upper part of the front converter chamber, which is conducive to heat dissipation and reduces mutual influence.

[0096] AC-phase A, B, and C connection terminals 201, 202, and 203 are installed on the outer surface of the rear panel 003 corresponding to the AC chamber 012. A three-phase AC circuit breaker 205, A-phase, B-phase, and C-phase fuses 206, 207, and 208, and a overvoltage protector 209 are installed behind the front panel 002. The AC circuit breaker 205 has A-phase, B-phase, and C-phase access terminals 210, 211, and 212 and A-phase, B-phase, and C-phase output terminals 213, 214, and 215. The overvoltage protector 209 has A-phase, B-phase, and C-phase access terminals 216, 217, and 218 and an output terminal 220. The A-phase, B-phase, and C-phase connection terminals 201, 202, and 203 are respectively connected to the A-phase, B-phase, and C-phase access terminals 210, 211, and 212 of the AC circuit breaker. The A-phase, B-phase, and C-phase output terminals 213, 214, and 215 of the AC circuit breaker are respectively connected to one end of the A-phase, B-phase, and C-phase fuses 206, 207, and 208. The A-phase, B-phase, and C-phase access sections 216, 217, and 218 of the overvoltage protector are respectively connected to the A-phase, B-phase, and C-phase output terminals 213, 214, and 215 of the AC circuit breaker. There is a grounding point 221 on the frame 001, and the grounding point 221 is connected to the output terminal 220 of the overvoltage protector.

[0097] The PCS in the device needs to be interconnected with, disconnected from, and protected against the external power grid. The interconnection and disconnection are achieved by operating the three-phase AC circuit breaker 205. Abnormalities in the PCS or the power grid are manifested as overvoltage or overcurrent. The overvoltage is eliminated by the overvoltage protector 209, and the overcurrent is protected by two means: the AC circuit breaker 205 and the fuses 206, 207, and 208. The fuses achieve fast fusing protection for extremely large currents, and the AC circuit breaker achieves slightly slower disconnection protection for larger currents. The two complement each other.

[0098] On the rear panel 003, DC V+ and V- connection terminals 301 and 302 are installed corresponding to the outside of the DC room 014. Behind the front panel 002, a bipolar DC circuit breaker 303, a DC fuse 304, a DC relay 305, and a DC shunt / sensor 306 are installed. The DC circuit breaker 303 has a V+ input terminal 309, a V- input terminal 310, a V+ output terminal 311, and a V- output terminal 312. The V+ and V- connection terminals 301 and 302 are respectively connected to the V+ and V- input terminals 309 and 310 of the DC circuit breaker. One end of the V+ output terminal 311 or the V- output terminal 312 of the DC circuit breaker is connected to one end of the DC fuse 304. One end of the DC relay 305 is connected to the other end of the DC fuse 304 or the V- output terminal 312 or the V+ output terminal 311, and one end of the DC shunt / sensor 306 is connected to the other end of the DC relay 305 or the other end of the fuse 304 or the V+ output terminal 311 or the V- output terminal 312, forming a V+ output terminal extended circuit 313 and a V- output terminal extended circuit 314.

[0099] The PCS in the device needs to be interconnected with, disconnected from, and protected against the external energy storage battery. The interconnection and disconnection are first manually operated by the DC circuit breaker 303 for connection and disconnection, and then electrically (automatically achievable) operated by the DC relay 305 for connection and disconnection. Abnormalities in the PCS or the energy storage battery are manifested as overcurrent, and the overcurrent is protected by two means: the DC circuit breaker 303 and the DC fuse 304. The fuse achieves fast fusing protection for extremely large currents, and the DC circuit breaker achieves slightly slower disconnection protection for larger currents. The two complement each other.

[0100] On the filter reactor board 101, the A-phase, B-phase, and C-phase reactance circuits 109, 110, and 111 are arranged longitudinally. Each phase of the reactance circuits 109, 110, and 111 has primary devices, namely a large reactor 112 and a small reactor 113. On the capacitor board 102, there are no less than 20 primary device energy storage capacitors 114. The energy storage capacitors 114 are divided into a +-pole capacitor group 115 and a -pole capacitor group 116 with the same quantity. On the capacitor board 102, there are a +-pole copper foil 117, an N-pole copper foil 118, and a -pole copper foil 119. Each phase of the IGBT tubes 106, 107, and 108 has an IGBT +-extreme 120, an IGBT N-extreme 121, an IGBT -extreme 122, and an IGBT S-extreme 123. The S-extremes 123 of the A-phase, B-phase, and C-phase IGBT tubes are respectively connected to one end of the large reactors 112 of the A-phase, B-phase, and C-phase reactance circuits 109, 110, and 111. The other end of the large reactor 112 is connected to one end of the small reactor 113. The +-extremes 120, N-extremes 121, and -extremes 122 of the A-phase, B-phase, and C-phase IGBT tubes 106, 107, and 108 are respectively connected to the +-pole copper foil 117, N-pole copper foil 118, and -pole copper foil 119 at the front part of the energy storage capacitor board 102. The energy storage capacitor 114 has a +-pole and a -pole. The positive and negative electrodes of the energy storage capacitor 114 in the +-pole capacitor group 115 are respectively connected to the +-pole copper foil 117 and the N-pole copper foil 118. The positive and negative electrodes of the energy storage capacitor 114 in the -pole capacitor group 116 are respectively connected to the N-pole copper foil 118 and the -pole copper foil 119.

[0101] Under the software control of the secondary controller circuit, the IGBT converts the AC electric energy of the power grid into DC electric energy that can be stored in the battery, or converts the DC electric energy stored in the battery into AC electric energy that can be injected into the power grid. The large and small reactors on the filter reactor board 101 form a two-stage filter circuit to improve the quality of the AC electric energy emitted by the IGBT, and the energy storage capacitors on the energy storage capacitor board improve the quality of the DC electric energy emitted by the IGBT.

[0102] The other ends of the small reactors 113 of the A-phase, B-phase, and C-phase reactance circuits 109, 110, and 111 in the converter box 013 respectively use connecting copper parts to pass through the right partition 006 and are connected to the other ends of the A-phase, B-phase, and C-phase fuses 206, 207, and 208 in the AC box 012. The parts of the +-pole and -pole copper foils 117 and 119 of the energy storage capacitor board 102 in the converter box 013 near the rear panel 003 respectively use connecting copper parts to pass through the left partition 007 and are connected to the ends 315 of the extended circuits 313 and 314 of the V+ and V- output terminals of the DC circuit breaker in the DC box 014.

[0103] The flow direction of the primary current for converting AC to DC is as follows: three-phase power supply of the power grid → phase A, B, and C terminal blocks 201, 202, and 203 on the rear panel 003 of the AC box 012 → three-phase AC circuit breaker 205 in the AC box 012 → phase A, B, and C fuses 206, 207, and 208 / overvoltage protector 209 → copper connection piece connecting the AC box 012 and the rear part of the converter upper chamber 015 → the other end of the small reactors 113 of the phase A, B, and C reactance circuits 109, 110, and 111 in the converter upper chamber 015 → one end of the small reactor 113 → the other end of the large reactor 112 → one end of the large reactor 112 → the S terminal 123 of the IGBT tube in the pre-conversion chamber 017 → the + terminal 120, N terminal 121, and - terminal 122 of the IBGT tube → the front parts of the +, N, and - pole copper foils 117, 118, and 119 of the energy storage capacitor board 102 in the converter lower chamber 016 → the rear parts of the + and - pole copper foils 117 and 119 → the copper connection piece passing through the left partition 007 → the end 315 of the post-extension circuit at the rear of the DC box 014 → the V + and V - output post-extension circuits 313 and 314 → the DC circuit breaker 303 → the V + and V - terminal blocks 301 and 302 on the rear panel 003 of the DC box 014 → the + and - poles of the energy storage battery.

[0104] The flow direction of the primary current for converting DC to AC is opposite to that for converting AC to DC: the + and - poles of the energy storage battery → the V + and V - terminal blocks 301 and 302 on the rear panel 003 of the DC box 014 → the DC circuit breaker 303 in the DC box 014 → the V + and V - output post-extension circuits 313 and 314 at the rear of the DC box 014 → the end 315 of the post-extension circuit → the copper connection piece passing through the left partition 007 → the rear parts of the + and - pole copper foils 117 and 119 of the energy storage capacitor board 102 in the converter lower chamber 016 → the front parts of the + and - pole copper foils 117 and 119 of the energy storage capacitor board 102 → the + terminal 120, N terminal 121, and - terminal 122 of the IBGT tube in the pre-conversion chamber 017 → the S terminal 123 of the IGBT tube → one end of the large reactor 112 in the converter upper chamber 015 → the other end of the large reactor 112 → one end of the small reactor 113 → the other end of the small reactor 113 → the copper connection piece connecting the AC box 012 and the rear part of the converter upper chamber 015 passing through the right partition 006 → the phase A, B, and C fuses 206, 207, and 208 / overvoltage protector 209 of the AC box 012 → the AC circuit breaker 205 at the front of the AC box 012 → the phase A, B, and C terminal blocks 201, 202, and 203 outside the rear panel 003 of the AC box 012 → the three-phase power supply of the power grid.

Claims

1. An installation and connection structure of primary devices of a microgrid battery energy storage integrated device, characterized in that it includes: 1 steel frame (001), the frame (001) is welded by a front plate (002), a rear panel (003), a right side plate (004), a left side plate (005), a right partition (006), a left partition (007), and a middle partition (008); the right partition (006) and the left partition (007) longitudinally divide the frame (001) into an AC box (012), a converter box (013), and a DC box (014); the middle partition (008) is shorter and is connected to the rear panel (003), and transversely divides the converter box (013) into an upper converter chamber (015), a lower converter chamber (016), and a front converter chamber (017); the frame (001) has an upper cover plate (018) and a lower cover plate (019); A filter reactor board (101) is installed in the upper converter chamber (015), an energy storage capacitor board (102) is installed in the lower converter chamber (016), a radiator substrate (104) is installed in the front converter chamber (017), longitudinal heat sinks (105) are installed on the radiator substrate (104), and A-phase, B-phase, and C-phase primary converter devices IGBT tubes (106, 107, 108) are installed under the radiator substrate (104) from right to left or from left to right. The IGBT tubes (106, 107, 108) are horizontally located in the middle of the front converter chamber (017) for easy connection to the filter reactor board (101) and the energy storage capacitor board (102); AC A-phase, B-phase, and C-phase connection terminals (201, 202, 203) are installed outside the frame corresponding to the AC box (012); a three-phase AC circuit breaker (205), A-phase, B-phase, and C-phase fuses (206, 207, 208), and a overvoltage protector (209) are installed behind the front plate (002); the AC circuit breaker (205) has A-phase, B-phase, and C-phase access terminals (210, 211, 212) and A-phase, B-phase, and C-phase output terminals (213, 214, 215), and the overvoltage protector (209) has A-phase, B-phase, and C-phase access terminals (216, 217, 218) and an output terminal (220); the A-phase, B-phase, and C-phase connection terminals (201, 202, 203) are respectively connected to the A-phase, B-phase, and C-phase access terminals (210, 211, 212) of the AC circuit breaker, the A-phase, B-phase, and C-phase output terminals (213, 214, 215) of the AC circuit breaker are respectively connected to one end of the A-phase, B-phase, and C-phase fuses (206, 207, 208), and the A-phase, B-phase, and C-phase access sections (216, 217, 218) of the overvoltage protector are respectively connected to the A-phase, B-phase, and C-phase output terminals (213, 214, 215) of the AC circuit breaker; there is a grounding point (221) on the frame (001), and the grounding point (221) is connected to the output terminal (220) of the overvoltage protector.

2. The installation and connection structure of the primary devices of the microgrid battery energy storage integrated device according to claim 1, characterized in that: On the outer surface of the rear panel (003) corresponding to the DC box (014), there are DC V+ and V- connection terminals (301, 302). Behind the front panel (002), there are a bipolar DC circuit breaker (303), a DC fuse (304), a DC relay (305), and a DC shunt / sensor (306); on the DC circuit breaker (303), there are a V+ access terminal (309), a V- access terminal (310), a V+ output terminal (311), and a V- output terminal (312); the V+ and V- connection terminals (301, 302) are respectively connected to the V+ and V- access terminals (309, 310) of the DC circuit breaker; the V+ output terminal (311) or the V- output terminal (312) of the DC circuit breaker is connected to one end of the DC fuse (304); one end of the DC relay (305) is connected to the other end of the DC fuse (304) or the V- output terminal (312) or the V+ output terminal (311), and one end of the DC shunt / sensor (306) is connected to the other end of the DC relay (305) or the other end of the fuse (304) or the V+ output terminal (311) or the V- output terminal (312), forming a V+ output terminal extended circuit (313) and a V- output terminal extended circuit (314).

3. The installation and connection structure of the primary devices of the microgrid battery energy storage integrated device according to claim 2, characterized in that: On the filter reactor board (101), there are A-phase, B-phase, and C-phase reactance circuits (109, 110, 111) arranged longitudinally. Each phase reactance circuit (109, 110, 111) has a primary device large reactor (112) and a small reactor (113); on the capacitor board (102), there are installed no less than 20 primary device energy storage capacitors (114). The energy storage capacitors (114) are divided into +-polar capacitor groups (115) and --polar capacitor groups (116) with the same quantity. On the capacitor board (102), there are a +-polar copper foil (117), an N-polar copper foil (118), and a --polar copper foil (119); each phase IGBT tube (106, 107, 108) has an IGBT +-extreme (120), an IGBT N-extreme (121), an IGBT --extreme (122), and an IGBT S-extreme (123); the S-extremes (123) of the A-phase, B-phase, and C-phase IGBT tubes are respectively connected to one end of the large reactors (112) of the A-phase, B-phase, and C-phase reactance circuits (109, 110, 111), and the other end of the large reactor (112) is connected to one end of the small reactor (113); the +-extremes (120), N-extremes (121), and --extremes (122) of the A-phase, B-phase, and C-phase IGBT tubes (106, 107, 108) are respectively connected to the +-polar copper foil (117), N-polar copper foil (118), and --polar copper foil (119) at the front of the energy storage capacitor board (102); the energy storage capacitors (114) have a +-polarity and a --polarity. The positive and negative electrodes of the energy storage capacitors (114) in the +-polar capacitor group (115) are respectively connected to the +-polar copper foil (117) and the N-polar copper foil (118), and the positive and negative electrodes of the energy storage capacitors (114) in the --polar capacitor group (116) are respectively connected to the N-polar copper foil (118) and the --polar copper foil (119).

4. The installation and connection structure of the primary devices of the microgrid battery energy storage integrated device according to claim 3, characterized in that: The other ends of the small reactors (113) in the A-phase, B-phase, and C-phase reactance circuits (109, 110, 111) in the converter box (013) are respectively connected to the other ends of the A-phase, B-phase, and C-phase fuses (206, 207, 208) in the AC box (012) through connecting copper parts passing through the right partition (006); the + and - pole copper foils (117, 119) of the energy storage capacitor board (102) in the converter box (013) near the rear panel (003) are respectively connected to the ends (315) of the extended circuits (313, 314) of the DC breaker V+ and V- output terminals in the DC box (014) through connecting copper parts passing through the left partition (007).

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