Office high-rise building energy storage system

Abstract

The invention provides an office high-rise building energy storage system which comprises energy storage cabinets and a control cabinet, the control cabinet is communicated with six energy storage cabinets at the same time, and a control method of the system comprises the steps that a control system of the control cabinet selects any two energy storage cabinets to be connected into the system, and the two energy storage cabinets are charged or discharged at the same time; recording the energy storage cabinet reaching the preset electric quantity percentage until any one of the energy storage cabinets is discharged / charged to the preset electric quantity percentage; any energy storage cabinet is selected from the remaining energy storage cabinets to be connected into the system, and synchronous discharging / charging is carried out through an energy storage converter PCS; repeating the steps until only one energy storage cabinet does not reach the preset electric quantity percentage, and recording the energy storage cabinet as a target energy storage cabinet; the priority of the standard energy storage cabinet is adjusted according to the discharging / charging working condition of the last round, seamless switching of the energy storage cabinet is achieved, the electric quantity is fully utilized, and the electricity utilization stability and the service life length of the battery pack are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage energy storage cabinets, and in particular to an energy storage system for office-type high-rise buildings. Background Art

[0002] The core reason why high-rise buildings need to be equipped with high and low voltage power distribution systems is their huge power demand and complex power usage environment. As the key hub connecting the external power grid and the internal power system of the building, the high and low voltage power distribution system is usually carefully arranged in the hidden areas of the building, such as the basement or the top floor, to play two core functions:

[0003] The first is power distribution, which converts external high-voltage power into low-voltage power required inside the building, and accurately controls and distributes it to each power-consuming unit to ensure efficient and reasonable power supply;

[0004] The second is safety assurance. The system strictly follows the national power safety regulations and integrates multiple protection mechanisms. It can respond quickly to power anomalies, effectively isolate faults, and protect the safety of buildings and personnel. In addition, the design of high and low voltage distribution systems is a comprehensive art that requires comprehensive consideration of many factors such as power load, voltage level, and wiring mode to build a stable, safe, and efficient power supply system. Therefore, in the planning and construction of high-rise buildings, the scientific design and reasonable layout of high and low voltage distribution systems are undoubtedly the key to ensuring the stability and safety of building power supply.

[0005] However, there is currently a lack of a high-voltage energy storage system that can be used in high-rise office buildings and can achieve seamless switching to avoid power outages when the energy storage box is switched. Therefore, it is urgent to propose corresponding technical solutions to meet the energy storage and power supply needs of high-rise office buildings. Summary of the invention

[0006] In order to solve the above problems, the present invention provides an energy storage system for office-type high-rise buildings, which is implemented as follows:

[0007] An energy storage system for office-type high-rise buildings includes an energy storage cabinet and a control cabinet. The control cabinet is connected to six energy storage cabinets at the same time. The control method of the system includes:

[0008] The control system of the control cabinet selects any two of the energy storage cabinets to access the system, and the two energy storage cabinets are charged or discharged simultaneously through the two DC-DCs inside the control cabinet and then through the energy storage converter PCS, until any one of the two energy storage cabinets discharged / charged reaches a preset power percentage and records the energy storage cabinet that reaches the preset power percentage;

[0009] The control system of the control cabinet selects one energy storage cabinet from the remaining energy storage cabinets to access the system, and the energy storage cabinet is connected to the energy storage converter PCS through the third DC-DC, and synchronously discharges / charges through the energy storage converter PCS. When the third energy storage cabinet is discharged / charged normally, the system disconnects the energy storage cabinet that has reached the preset power percentage;

[0010] When any one of the two energy storage cabinets is discharged / charged to a preset power percentage, the energy storage cabinet that has reached the preset power percentage is recorded again, and at the same time, one energy storage cabinet is selected from the remaining energy storage cabinets that have not been recorded to connect to the system and the above steps are repeated until only one energy storage cabinet has not reached the preset power percentage and the energy storage cabinet is recorded as the target energy storage cabinet;

[0011] If the energy storage cabinet performs discharging behavior in the previous round, then charging behavior will be performed in the subsequent round, otherwise it will perform discharging behavior. If the energy storage cabinet performs auxiliary mains discharge behavior normally in the previous round, the priority of the target energy storage cabinet in the next round of charging behavior is adjusted to the lowest. If the energy storage cabinet is fully discharged in the previous round, the discharging behavior continues until the power percentage of the target energy storage cabinet reaches a preset value; if the energy storage cabinet performs charging behavior in the previous round, the priority of the target energy storage cabinet in the next round of discharging behavior is adjusted to the highest.

[0012] As a further improvement, the six energy storage cabinets are numbered with Arabic numerals, where:

[0013] The positive poles of the six energy storage cabinets are connected to connectors P1A, P2A, P3A, P4A, P5A and P6A according to their numbers, and then connected to the DCDC1 circuit through circuit breakers K1A, K2A, K3A, K4A, K5A and K6A according to their numbers;

[0014] The positive poles of the six energy storage cabinets are connected to connectors P1 B, P2B, P3B, P4B, P5B and P6B ​​according to their numbers, and then connected to the DCDC2 circuit through circuit breakers K1 B, K2B, K3B, K4B, K5B and K6B according to their numbers;

[0015] The positive poles of the six energy storage cabinets are connected to connectors P1C, P2C, P3C, P4C, P5C and P6C according to their numbers, and then connected to the DCDC3 circuit through circuit breakers K1C, K2C, K3C, K4C, K5C and K6C according to their numbers.

[0016] As a further improvement, the output ends of the DCDC1 loop, DCDC2 loop and DCDC3 loop are connected in parallel to the subsequent energy storage converter PCS, and the AC end output of the energy storage converter PCS is connected to the load through the circuit breaker QF1, and is simultaneously connected to the power grid through the dual power static switch STS and the circuit breaker QF2.

[0017] As a further improvement, a 24V ACDC module is added to the AC end of the energy storage converter PCS to convert the AC power provided by the power grid into DC24V for powering the system.

[0018] As a further improvement, before being connected to the grid, TA_U, TA_V, and TA_W current transformers are installed on the AC ABC phase lines respectively;

[0019] The anti-backflow protection device Hz65082H collects the voltage and current signals at the grid-connected end and sends them to the anti-backflow protection device Hz6080H for analysis and feeds back the information to the EMS at the same time.

[0020] As a further improvement, the negative poles of the six energy storage cabinets are connected to connectors PB1, PB2, PB3, PB4, PB5 and PB6 respectively according to their numbers, and the six negative poles are connected together inside the control cabinet and then connected to the negative pole of the DCDC input.

[0021] As a further improvement, the circuit arrangement of the high-voltage box in the energy storage cabinet is as follows:

[0022] The positive electrode of the battery pack is connected to the P2 terminal, and the negative electrode is connected to the P4 terminal. The positive electrode is sent to the circuit breaker QF1 through the fuse F1 and the negative electrode through the Hall sensor, wherein the circuit breaker QF1 is used for total battery input control, and the Hall sensor is used to detect electricity. After the positive electrode of the battery pack is output from the circuit breaker QF1, it returns to the negative electrode of the battery pack through the closed circuit breaker K1, circuit breaker K6 and resistor R1 to form a pre-charging circuit, returns to the negative electrode of the battery pack through the closed circuit breaker K2 and circuit breaker K6 to form a main discharge circuit, returns to the negative electrode of the battery pack through the closed circuit breaker K3 and circuit breaker K10 to form a charging pile circuit, and returns to the negative electrode of the battery pack through the closed circuit breaker K5 and circuit breaker K6 to form a liquid cooling unit and backup power circuit;

[0023] The high-voltage box communicates with the machine and PACK through the P8 terminal, and the high-voltage box communicates with the ES through the P1 terminal, where ES is an electronic safety system, and the high-voltage box supplies 24V power to the external EMS through the P11 terminal;

[0024] Terminal P1 is the DC-DC input interface, terminal P3 is the DC-DC output interface, terminal P10 is the 24V backup power interface, terminals P5 and P13 are the high-voltage interfaces of the liquid cooling unit, and terminal P14 is the 24V power supply interface of the liquid cooling unit;

[0025] Terminals P15 and P16 are the charging pile power line connectors, and terminal P17 is the charging pile and high-voltage box communication connector.

[0026] As a further improvement, the positive pole of the battery pack is connected to DCDC, and is connected to the DCDC24V power module after isolation and rectification by diodes Dn1, Dn2 and Dn3, and converted into a 24V source to charge the 24V backup battery and power the control system of the control cabinet.

[0027] As a further improvement, each contactor of the control cabinet is arranged at an auxiliary contact, and the auxiliary contact feeds back the contact status of the contactor to the control system in real time. The control cabinet distinguishes the access status of the energy storage cabinet according to the contact status of the contactor and implements control.

[0028] The beneficial effects of the present invention are:

[0029] By setting up a control cabinet to pair with six energy storage cabinets, presetting the power percentage threshold inside the energy storage cabinet, and using two energy storage cabinets to discharge / charge at the same time, the stability of the entire discharge / charge process is guaranteed and the safety performance is improved. In addition, by recording the target energy storage cabinet, it is possible to achieve a complete cycle of full charge-full discharge for each energy storage cabinet, avoiding the system's non-pseudo-random selection of energy storage cabinets, resulting in a higher utilization rate of one energy storage cabinet than other energy storage cabinets, which in turn shortens the service life of the energy storage cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The electrical schematic diagram of the high voltage box and control cabinet of the present invention;

[0031] Figure 2 This is a 6-way electrical schematic diagram of a single cluster control cabinet of the present invention;

[0032] Figure 3 for Figure 1 The partial enlarged view of the upper left area is an electrical schematic diagram of the discharge and charging circuit of the high-voltage box in the energy storage cabinet provided by the present invention;

[0033] Figure 4 For Figure 1 middle Figure 3 The partial enlarged view of the area to the right of the area is an electrical schematic diagram of the P1, P3, P10, P13, P14 terminals of the high-voltage box in the energy storage cabinet provided by the present invention and the position distribution of the 24V backup power supply;

[0034] Figure 5 For Figure 1 middle Figure 4 The partial enlarged view of the area below the area is an electrical schematic diagram of the present invention connected to the power line of the charging pile;

[0035] Figure 6 For Figure 1 middle Figure 3The partial enlarged view of the area below the area is an electrical schematic diagram of each chip used in the high-voltage box in the energy storage cabinet provided by the present invention;

[0036] Figure 7 For Figure 1 middle Figure 5 The partial enlarged view of the area below the area is a chip electrical schematic diagram of the connection terminal P7 of the control system in the high-voltage box of the energy storage cabinet provided by the present invention and the functional components in the cabinet, as well as a chip electrical schematic diagram of the connection terminal P11 for communication with the external EMS;

[0037] Figure 8 for Figure 2 The partial enlarged view of the upper middle area is an electrical schematic diagram of the connection relationship between the DCDC1 loop, the DCDC2 loop, the DCDC3 loop, the current transformer, the anti-reverse current protection device, the lightning protection device and the energy storage converter PCS in the control cabinet control system provided by the present invention;

[0038] Fig. 9 for Figure 2 middle Figure 8 The local enlarged view of the area below the area is an electrical schematic diagram of the connection relationship between the DCDC and the negative electrode of the energy storage cabinet in the control system of the control cabinet provided by the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0040] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0041] An energy storage system for office-type high-rise buildings includes an energy storage cabinet and a control cabinet. The control cabinet is connected to six energy storage cabinets at the same time. The control method of the system includes:

[0042] The control system of the control cabinet selects any two of the energy storage cabinets to access the system, and the two energy storage cabinets are charged or discharged simultaneously through the two DC-DCs inside the control cabinet and then through the energy storage converter PCS, until any one of the two energy storage cabinets discharged / charged reaches a preset power percentage and records the energy storage cabinet that reaches the preset power percentage;

[0043] The control system of the control cabinet selects one energy storage cabinet from the remaining energy storage cabinets to access the system, and the energy storage cabinet is connected to the energy storage converter PCS through the third DC-DC, and synchronously discharges / charges through the energy storage converter PCS. When the third energy storage cabinet is discharged / charged normally, the system disconnects the energy storage cabinet that has reached the preset power percentage;

[0044] When any one of the two energy storage cabinets is discharged / charged to a preset power percentage, the energy storage cabinet that has reached the preset power percentage is recorded again, and at the same time, one energy storage cabinet is selected from the remaining energy storage cabinets that have not been recorded to connect to the system and the above steps are repeated until only one energy storage cabinet has not reached the preset power percentage and the energy storage cabinet is recorded as the target energy storage cabinet;

[0045] If the energy storage cabinet performs discharging behavior in the previous round, then charging behavior will be performed in the subsequent round, otherwise it will perform discharging behavior. If the energy storage cabinet performs auxiliary mains discharge behavior normally in the previous round, the priority of the target energy storage cabinet in the next round of charging behavior is adjusted to the lowest. If the energy storage cabinet is fully discharged in the previous round, the discharging behavior continues until the power percentage of the target energy storage cabinet reaches a preset value; if the energy storage cabinet performs charging behavior in the previous round, the priority of the target energy storage cabinet in the next round of discharging behavior is adjusted to the highest.

[0046] As a further improvement, the six energy storage cabinets are numbered with Arabic numerals, where:

[0047] The positive poles of the six energy storage cabinets are connected to connectors P1A, P2A, P3A, P4A, P5A and P6A according to their numbers, and then connected to the DCDC1 circuit through circuit breakers K1A, K2A, K3A, K4A, K5A and K6A according to their numbers;

[0048] The positive poles of the six energy storage cabinets are connected to connectors P1 B, P2B, P3B, P4B, P5B and P6B ​​according to their numbers, and then connected to the DCDC2 circuit through circuit breakers K1 B, K2B, K3B, K4B, K5B and K6B according to their numbers;

[0049] The positive poles of the six energy storage cabinets are connected to connectors P1C, P2C, P3C, P4C, P5C and P6C according to their numbers, and then connected to the DCDC3 circuit through circuit breakers K1C, K2C, K3C, K4C, K5C and K6C according to their numbers.

[0050] As a further improvement, the output ends of the DCDC1 loop, DCDC2 loop and DCDC3 loop are connected in parallel to the subsequent energy storage converter PCS, and the AC end output of the energy storage converter PCS is connected to the load through the circuit breaker QF1, and is simultaneously connected to the power grid through the dual power static switch STS and the circuit breaker QF2.

[0051] As a further improvement, a 24V ACDC module is added to the AC end of the energy storage converter PCS to convert the AC power provided by the power grid into DC24V for powering the system.

[0052] As a further improvement, before being connected to the grid, TA_U, TA_V, and TA_W current transformers are installed on the AC ABC phase lines respectively;

[0053] The anti-backflow protection device Hz65082H collects the voltage and current signals at the grid-connected end and sends them to the anti-backflow protection device Hz6080H for analysis and feeds back the information to the EMS at the same time.

[0054] As a further improvement, the negative poles of the six energy storage cabinets are connected to connectors PB1, PB2, PB3, PB4, PB5 and PB6 respectively according to their numbers, and the six negative poles are connected together inside the control cabinet and then connected to the negative pole of the DCDC input.

[0055] As a further improvement, the circuit arrangement of the high-voltage box in the energy storage cabinet is as follows:

[0056] The positive electrode of the battery pack is connected to the P2 terminal, and the negative electrode is connected to the P4 terminal. The positive electrode is sent to the circuit breaker QF1 through the fuse F1 and the negative electrode through the Hall sensor, wherein the circuit breaker QF1 is used for total battery input control, and the Hall sensor is used to detect electricity. After the positive electrode of the battery pack is output from the circuit breaker QF1, it returns to the negative electrode of the battery pack through the closed circuit breaker K1, circuit breaker K6 and resistor R1 to form a pre-charging circuit, returns to the negative electrode of the battery pack through the closed circuit breaker K2 and circuit breaker K6 to form a main discharge circuit, returns to the negative electrode of the battery pack through the closed circuit breaker K3 and circuit breaker K10 to form a charging pile circuit, and returns to the negative electrode of the battery pack through the closed circuit breaker K5 and circuit breaker K6 to form a liquid cooling unit and backup power circuit;

[0057] The high-voltage box communicates with the machine and PACK through the P8 terminal, and the high-voltage box communicates with the ES through the P1 terminal, where ES is an electronic safety system, and the high-voltage box supplies 24V power to the external EMS through the P11 terminal;

[0058] Terminal P1 is the DC-DC input interface, terminal P3 is the DC-DC output interface, terminal P10 is the 24V backup power interface, terminals P5 and P13 are the high-voltage interfaces of the liquid cooling unit, and terminal P14 is the 24V power supply interface of the liquid cooling unit;

[0059] Terminals P15 and P16 are the charging pile power line connectors, and terminal P17 is the charging pile and high-voltage box communication connector.

[0060] As a further improvement, the positive pole of the battery pack is connected to DCDC, and is connected to the DCDC24V power module after isolation and rectification by diodes Dn1, Dn2 and Dn3, and converted into a 24V source to charge the 24V backup battery and power the control system of the control cabinet.

[0061] As a further improvement, each contactor of the control cabinet is arranged at an auxiliary contact, and the auxiliary contact feeds back the contact status of the contactor to the control system in real time. The control cabinet distinguishes the access status of the energy storage cabinet according to the contact status of the contactor and implements control.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An energy storage system for office high-rise buildings, characterized in that: It includes an energy storage cabinet and a control cabinet, and the control cabinet is connected to 6 energy storage cabinets at the same time. The control method of the system includes: The control system of the control cabinet selects any two of the energy storage cabinets to access the system, and the two energy storage cabinets are charged or discharged simultaneously through the two DC-DCs inside the control cabinet and then through the energy storage converter PCS, until any one of the two energy storage cabinets discharged / charged reaches a preset power percentage and records the energy storage cabinet that reaches the preset power percentage; The control system of the control cabinet selects one energy storage cabinet from the remaining energy storage cabinets to access the system, and the energy storage cabinet is connected to the energy storage converter PCS through the third DC-DC, and synchronously discharges / charges through the energy storage converter PCS. When the third energy storage cabinet is discharged / charged normally, the system disconnects the energy storage cabinet that has reached the preset power percentage; When any one of the two energy storage cabinets is discharged / charged to a preset power percentage, the energy storage cabinet that has reached the preset power percentage is recorded again, and at the same time, one energy storage cabinet is selected from the remaining energy storage cabinets that have not been recorded to connect to the system and the above steps are repeated until only one energy storage cabinet has not reached the preset power percentage and the energy storage cabinet is recorded as the target energy storage cabinet; If the energy storage cabinet performs discharging behavior in the previous round, then charging behavior will be performed in the subsequent round, otherwise it will perform discharging behavior. If the energy storage cabinet performs auxiliary mains discharge behavior normally in the previous round, the priority of the target energy storage cabinet in the next round of charging behavior is adjusted to the lowest. If the energy storage cabinet is fully discharged in the previous round, the discharging behavior continues until the power percentage of the target energy storage cabinet reaches a preset value; if the energy storage cabinet performs charging behavior in the previous round, the priority of the target energy storage cabinet in the next round of discharging behavior is adjusted to the highest.

2. An office high-rise building energy storage system as claimed in claim 1, characterized in that: The six energy storage cabinets are numbered with Arabic numerals, where: The positive poles of the six energy storage cabinets are connected to connectors P1A, P2A, P3A, P4A, P5A and P6A according to their numbers, and then connected to the DCDC1 circuit through circuit breakers K1A, K2A, K3A, K4A, K5A and K6A according to their numbers; The positive poles of the six energy storage cabinets are connected to connectors P1 B, P2B, P3B, P4B, P5B and P6B ​​according to their numbers, and then connected to the DCDC2 circuit through circuit breakers K1 B, K2B, K3B, K4B, K5B and K6B according to their numbers; The positive poles of the six energy storage cabinets are connected to connectors P1C, P2C, P3C, P4C, P5C and P6C according to their numbers, and then connected to the DCDC3 circuit through circuit breakers K1C, K2C, K3C, K4C, K5C and K6C according to their numbers.

3. An office high-rise building energy storage system as claimed in claim 2, characterized in that: The output ends of the DCDC1 loop, DCDC2 loop and DCDC3 loop are connected in parallel to the subsequent energy storage converter PCS. The AC end output of the energy storage converter PCS is connected to the load through the circuit breaker QF1, and is simultaneously connected to the power grid through the dual power static switch STS and the circuit breaker QF2.

4. An office high-rise building energy storage system as claimed in claim 3, characterized in that: A 24V ACDC module is added to the AC end of the energy storage converter PCS to convert the AC power provided by the power grid into DC24V for powering the system.

5. An office high-rise building energy storage system as claimed in claim 4, characterized in that: Before being connected to the grid, TA_U, TA_V, and TA_W current transformers are installed on the AC ABC phase lines respectively; The anti-backflow protection device Hz65082H collects the voltage and current signals at the grid-connected end and sends them to the anti-backflow protection device Hz6080H for analysis and feeds back the information to the EMS at the same time.

6. An office high-rise building energy storage system as claimed in claim 2, characterized in that: The negative poles of the six energy storage cabinets are connected to connectors PB1, PB2, PB3, PB4, PB5 and PB6 respectively according to their numbers. The six negative poles are connected together inside the control cabinet and then connected to the negative pole of the DCDC input.

7. An office high-rise building energy storage system as claimed in claim 6, characterized in that: The circuit arrangement of the high-voltage box in the energy storage cabinet is as follows: The positive electrode of the battery pack is connected to the P2 terminal, and the negative electrode is connected to the P4 terminal. The positive electrode is sent to the circuit breaker QF1 through the fuse F1 and the negative electrode through the Hall sensor, wherein the circuit breaker QF1 is used for total battery input control, and the Hall sensor is used to detect electricity. After the positive electrode of the battery pack is output from the circuit breaker QF1, it returns to the negative electrode of the battery pack through the closed circuit breaker K1, circuit breaker K6 and resistor R1 to form a pre-charging circuit, returns to the negative electrode of the battery pack through the closed circuit breaker K2 and circuit breaker K6 to form a main discharge circuit, returns to the negative electrode of the battery pack through the closed circuit breaker K3 and circuit breaker K10 to form a charging pile circuit, and returns to the negative electrode of the battery pack through the closed circuit breaker K5 and circuit breaker K6 to form a liquid cooling unit and backup power circuit; The high-voltage box communicates with the machine and PACK through the P8 terminal, and the high-voltage box communicates with the ES through the P1 terminal, where ES is an electronic safety system, and the high-voltage box supplies 24V power to the external EMS through the P11 terminal; Terminal P1 is the DC-DC input interface, terminal P3 is the DC-DC output interface, terminal P10 is the 24V backup power interface, terminals P5 and P13 are the high-voltage interfaces of the liquid cooling unit, and terminal P14 is the 24V power supply interface of the liquid cooling unit; Terminals P15 and P16 are the charging pile power line connectors, and terminal P17 is the charging pile and high-voltage box communication connector.

8. An office high-rise building energy storage system as claimed in claim 7, characterized in that: The positive pole of the battery pack is connected to DCDC, and is connected to the DCDC24V power supply module after isolation and rectification by diodes Dn1, Dn2 and Dn3, and converted into a 24V source to charge the 24V backup battery and power the control system of the control cabinet.

9. An office high-rise building energy storage system as claimed in claim 8, characterized in that: Each contactor of the control cabinet is arranged at an auxiliary contact, and the auxiliary contact feeds back the contact status of the contactor to the control system in real time. The control cabinet distinguishes the access status of the energy storage cabinet according to the contact status of the contactor and implements control.

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