Ultra-long standby power UPS (Uninterrupted Power Supply) system

Abstract

The utility model discloses a super-long standby power UPS (Uninterrupted Power Supply) system, which comprises one or more battery packs, a PCS (Energy Storage Converter) and a UPS, when the number of the battery packs is two or more, the positive ends of the battery packs are connected to form a total positive end of the battery packs, the negative ends of the battery packs are connected to form a total negative end of the battery packs, the total positive end is connected to the direct current positive end of the PCS, and the total negative end is connected to the direct current negative end of the PCS to form parallel connection of the battery packs; when the number of the battery pack is one, the positive end of the battery pack is connected to the direct current positive end of the PCS, and the negative end of the battery pack is connected to the direct current negative end of the PCS; the alternating current input end of the PCS is connected with the mains supply input, and the alternating current output end of the PCS is connected to the alternating current input end of the UPS; and the alternating current output end of the UPS is connected to a load. According to the ultra-long standby power UPS system of the utility model, the standby power duration can be increased according to the needs of users, and uninterrupted power utilization can be realized under the condition of power failure.

Description

TECHNICAL FIELD

[0001] The utility model relates to a UPS circuit, especially a super-long standby power UPS system. BACKGROUND

[0002] Uninterruptible power supply (UPS) is a kind of power equipment, and its main function is to provide temporary backup power supply for critical electronic equipment when power supply is interrupted, to ensure the continuous operation of equipment and the integrity of data;UPS protects the connected equipment from the fluctuation of power interruption by extremely fast switching speed.

[0003] The UPS systems on the market currently have a limitation, that is, they are mainly designed to provide short-time standby power. The standard operating time of these systems is usually between 11 minutes and 2 hours, and rarely exceeds 2 hours. This design is very effective for dealing with short-term power fluctuations or short-time power failure, and can ensure that critical equipment continues to operate before the power is restored. However, when long-time power failure occurs due to power repair, severe weather such as thunderstorm and power grid fault tripping, etc., these traditional UPS systems expose their shortcomings. In the case of power failure for more than 2 hours, servers in data centers, computers in offices and home appliances will not work normally due to power interruption, which will undoubtedly affect business operation, work efficiency and daily life, etc. SUMMARY

[0004] In view of the above problems existing in the prior art, the utility model provides a super-long standby power UPS system, which can increase the standby time according to user needs and realize long-time uninterrupted power supply in the case of power failure.

[0005] A super-long standby power UPS system includes one or more battery packs, energy storage converter PCS and uninterruptible power supply UPS;When the battery pack includes two or more, the positive terminals of each battery pack are connected to form the total positive terminal of the battery pack, the negative terminals of each battery pack are connected to form the total negative terminal of the battery pack, the total positive terminal is connected to the direct current positive terminal of PCS, and the total negative terminal is connected to the direct current negative terminal of PCS, forming the parallel connection of the battery pack;When the battery pack includes one, the positive terminal of the battery pack is connected to the direct current positive terminal of PCS, and the negative terminal of the battery pack is connected to the direct current negative terminal of PCS;The alternating current input end of PCS is connected to the power input, and the alternating current output end of PCS is connected to the alternating current input end of UPS;The alternating current output end of UPS is connected to the load.

[0006] Preferably, the battery pack, the PCS and the UPS are electrically connected to form a UPS cluster, and AC inputs of the UPSs of two or more UPS clusters are connected in parallel to realize parallel connection of the whole cluster to supply power to the load.

[0007] Preferably, the positive electrode terminals of the battery packs are connected by a metal conductor to form a total positive terminal of the battery pack, and the negative electrode terminals of the battery packs are connected by another metal conductor to form a total negative terminal of the battery pack.

[0008] Preferably, the metal conductor is a soft copper bar.

[0009] Preferably, the soft copper bar is provided with holes for fixing the soft copper bar to the electrode terminals of the battery pack at the positions where the soft copper bar is connected to the electrode terminals of the battery pack.

[0010] Preferably, the positive electrode terminals of the battery packs are connected by a wire to form a total positive terminal of the battery pack, and the negative electrode terminals of the battery packs are connected by a wire to form a total negative terminal of the battery pack.

[0011] Preferably, the battery core of the battery pack is a lithium iron phosphate battery.

[0012] Preferably, the battery pack is arranged in a battery cabinet.

[0013] Preferably, the PCS and the battery pack are connected by a network cable for communication.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] (1) The super-long standby power UPS system of the utility model connects the commercial power to the PCS AC input end, connects the PCS AC output end to the UPS AC input end, connects the UPS AC output end to the load, and connects the positive and negative DC terminals of the PCS to the positive and negative terminals of the parallel battery pack with expandable capacity, so that the standby power duration is increased according to the user's needs, and long-time uninterrupted power supply is realized under the condition of power failure.

[0016] (2) The PCS, the battery pack and the UPS of the utility model are electrically connected to form a UPS cluster, the AC output end of the UPS of one UPS cluster can be connected in parallel with the AC output end of one or more UPS clusters, the whole cluster is connected in parallel, and the power and capacity of the standby power can be further increased.

[0017] (3) The utility model uses the battery cabinet to fix the battery pack, can efficiently utilize the space, reduces the floor area; the connection between the battery packs and the equipment outside the battery cabinet is facilitated, the failure risk is reduced; the management is facilitated, the work efficiency is improved; and the overall appearance is improved.

[0018] (4) The battery pack of the utility model has stable chemical properties, is not prone to thermal runaway and explosion under overcharge, overdischarge or high-temperature environment, is high in safety, long in cycle life and can withstand thousands of times of charge-discharge cycles, and has a wide temperature range for work.

[0019] (5) The utility model discloses a PCS and battery pack through communication, can realize the detection of key parameters such as the charge-discharge state, voltage, current and temperature of the battery pack, ensure that the battery pack works within a safe range, can realize fault early warning, replace the damaged battery pack in time, can optimize the charge-discharge strategy and improve the overall efficiency and performance of the system.

[0020] (6) The utility model discloses that the parallel connection of each battery pack is realized by using a soft copper bar, can reduce the wiring quantity and reduce potential failure points, the soft copper bar has certain mechanical strength, can resist vibration and impact and keep the stability of connection, the soft copper bar can be cut and customized according to the length, is suitable for different battery pack combinations and expansion requirements, and the connection is simple, improving the overall appearance. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further described in combination with the drawings;

[0022] Figure 1 It is a circuit structure diagram of the super-long standby power UPS system of the utility model embodiment;

[0023] Figure 2 It is a structure front surface schematic diagram of the super-long standby power UPS system of the utility model embodiment;

[0024] Figure 3 It is a structure three-dimensional schematic diagram of the super-long standby power UPS system of the utility model embodiment. DETAILED DESCRIPTION

[0025] The utility model will be further described in combination with the drawings;

[0026] Parameter definition explanation:

[0027] PCS refers to power conversion system, can control the charge and discharge process of the connected battery pack, carries out AC-DC conversion (DC to AC, or AC to DC), under the mode of commercial power, the PCS receives commercial AC power, charges the battery through the AC-DC conversion of the PCS, simultaneously outputs AC power through the AC output end of the PCS, in the case of commercial power outage, can automatically switch to the battery mode, converts the DC power of the connected battery pack into AC power and outputs through the AC output end of the PCS.

[0028] UPS, refers to Uninterruptible Power Supply, which is built-in with a battery, a rectifier and an inverter. When the UPS is in normal working mode, the UPS receives AC input from the AC input end, converts the AC power into DC power through the built-in rectifier, charges the built-in battery with the DC power, and converts the DC power into AC power through the built-in inverter and outputs through the UPS AC output end; when the input of the AC input end of the UPS in normal working mode stops, the UPS can quickly switch to the power failure mode, converts the DC power of the built-in battery of the UPS into required AC power through the built-in inverter of the UPS, and outputs through the UPS AC output end.

[0029] As shown in Figure 1 , Figure 2 and Figure 3 , a super-long standby power UPS system includes one or more battery packs 11, an energy storage converter PCS 2 and an uninterruptible power supply UPS 3, which are specifically as follows.

[0030] In this embodiment, the battery pack 11 is built-in in the battery cabinet 1. The battery cabinet 1 includes a cabinet body 13, the battery pack 11 and a soft copper bar 12, and all the battery packs 11 are fixed on the cabinet body 13 in sequence by screws. Using the battery cabinet to accommodate the battery pack can efficiently utilize the space and reduce the floor area; facilitate the connection between the battery packs and the equipment outside the battery cabinet, and reduce the risk of failure; facilitate management and improve work efficiency; and improve the overall aesthetics.

[0031] In this embodiment, the soft copper bar 12 is used as a conductor for connecting the positive poles 111 of all the battery packs or connecting the negative poles 112 of all the battery packs. The soft copper bar 12 is holed at each position connected with the electrode of the battery pack 11, and one soft copper bar 12 is fixed to the positive pole 111 of each battery pack 11 through the hole by screws to form the total positive pole of the entire battery pack 11, and another soft copper bar 12 is fixed to the negative pole 112 of each battery pack 11 through the hole by screws to form the total negative pole of the entire battery pack 11, thereby realizing the parallel connection of all the battery packs 11. Using the soft copper bar can reduce the number of wiring and reduce the potential failure points; the soft copper bar has a certain mechanical strength and can resist vibration and impact to maintain the stability of the connection; the soft copper bar can be cut and customized in length as needed, and is suitable for different battery combinations and expansion requirements; the connection of the soft copper bar is simple, and the overall aesthetics is improved.

[0032] It should be noted that the conductor for connecting the positive poles of all the battery packs or connecting the negative poles of all the battery packs can adopt other connection modes such as wires, and is specifically set according to the needs, which is not limited in this embodiment.

[0033] Further, as shown in Figure 1As shown, in this embodiment, the AC input end 21 of the PCS 2 (i.e. Figure 1 the AC IN end of the PCS) is connected to the mains, the AC output end 22 of the PCS 2 (i.e. Figure 1 the AC OUT end of the PCS) is connected to the AC input end 31 of the UPS 3 (i.e. Figure 1 the AC IN end of the UPS), the DC positive end 23 of the PCS 2 (i.e. Figure 1 the BAT+ end of the PCS, hereinafter referred to as the BAT+ end) is connected to the total positive end of the battery pack 11, the DC negative end 24 of the PCS 2 (i.e. Figure 1 the BAT- end of the PCS, hereinafter referred to as the BAT- end) is connected to the total negative end of the battery pack 11, and the AC output end 32 of the UPS 3 (i.e. Figure 1 the AC OUT end of the UPS) is connected to the load (for example, Figure 1 the machine room 4 as shown).

[0034] In this embodiment, the battery cells in the battery pack 11 are lithium iron phosphate batteries, which have stable chemical properties and are not prone to thermal runaway and explosion under overcharge, overdischarge or high-temperature environment, have high safety, have long cycle life and can withstand thousands of charge and discharge cycles, and have a wide temperature range for work.

[0035] The number of battery packs 11 contained in the battery cabinet 1 is determined according to the capacity demand of the load, and there is an upper limit to the number of battery packs 11 that can be contained in one battery cabinet 1. In this embodiment, each battery pack 11 has a capacity of 5kW, and the capacity expansion and customization can be realized by connecting multiple battery packs 11 of the same specification and model in parallel. A single battery cabinet 1 can accommodate up to 32 battery packs 11 connected in parallel, with a maximum capacity of 160kWH. The number of battery packs 11 connected in parallel in a single battery cabinet 1 can be customized according to customer needs.

[0036] In this embodiment, the battery pack 11 (or battery pack, or battery PACK) is provided with a communication module and a communication interface 113, and the PCS 2 is provided with a communication module and a communication interface 25. The communication interfaces 113 of each battery pack 11 are connected in series through network cables, and the communication interface 25 of the PCS 2 is connected to the communication interface 113 of the battery pack 11 at the end through network cables, so as to realize the communication between the PCS 2 and all battery packs 11. Through communication, the PCS and the battery pack can detect the key parameters of the battery pack, including the charge and discharge state, voltage, current, temperature and SOC, to ensure that the battery pack works within a safe range; can realize fault warning and timely replacement of damaged battery packs; can optimize the charge and discharge strategy, and improve the overall efficiency and performance of the system.

[0037] The specific working process of the super-long standby power UPS system of this embodiment is as follows:

[0038] (1) When the mains is normal:

[0039] The mains AC 220V is input to the PCS 2 through the AC input end 21 of the PCS 2, at this time, the PCS 2 is in the mains mode, on the one hand, the PCS 2 outputs the AC 220V to the AC input end 31 of the UPS 3 through the AC output end 22; on the other hand, if the battery pack 11 is not fully charged, the PCS 2 charges the battery pack 11 through the BAT+ end 23 and the BAT- end 24 connected to the total positive end and the total negative end of the battery pack 11 respectively. At this time, the UPS 3 receiving the AC 220V input is in the normal working mode, the UPS 3 converts the AC 220V into direct current to charge the built-in battery of the UPS 3 (if the battery is not fully charged) through the built-in rectifier, and at the same time outputs the AC 220V to the load through the AC output end 32 of the UPS 3.

[0040] (2) When the mains is powered off, including the following stages:

[0041] Stage one, the UPS 3 enters the power failure mode, powered by the built-in battery of the UPS 3:

[0042] Based on the corresponding speed of the UPS 3 in the μs level, the UPS 3 first enters the power failure mode, and the UPS 3 uses the built-in battery and the inverter to convert the direct current output by the built-in battery into AC 220V through the built-in inverter and outputs it to the load through the AC output end 32 of the UPS 3, to ensure the continuity of power consumption of the load;

[0043] Stage two, the built-in battery of the UPS 3 is converted to the battery pack 11 power supply:

[0044] Secondly, the PCS 2, which reacts slower than the UPS 3, detects the power failure of the mains and changes to the battery mode, the battery pack 11 in the battery cabinet 1 inputs the direct current to the PCS 2, which is converted into AC 220V by the PCS 2 and output to the AC input end 31 of the UPS 3 through the AC output end 22 of the PCS 2.

[0045] After the UPS 3 receives the AC 220V input from the PCS 2, it changes to the normal working mode, and the AC output end 32 of the UPS 3 outputs the AC 220V to the load, and the internal rectifier converts the AC power into DC power to charge the built-in battery of the UPS 3. At this time, the conversion from the built-in battery of the UPS 3 to the battery pack 11 power supply is completed.

[0046] The high battery capacity of the battery cabinet 1 can provide long-time operation of the load, and compared with a single UPS 3, the standby time is greatly increased. The battery pack capacity is customized according to user needs, and the standby time can be increased according to user needs to realize long-time uninterrupted power supply in the case of power failure.

[0047] Stage three (if any), the battery group 11 in the battery cabinet 1 is depleted, and the UPS 3 continues to provide power for a short time:

[0048] When the power supply is out for too long, the battery group 11 in the battery cabinet 1 is depleted, and the PCS 2 has no output at the AC output end 22. At this time, the UPS 3 detects that there is no AC input at the AC input end 31 of the UPS 3, and the UPS 3 enters the power-off mode. The built-in battery of the UPS 3 converts the DC power of the built-in battery into AC 220V through the built-in inverter, and outputs it to the load through the AC output end 32 of the UPS 3 until the capacity of the built-in battery of the UPS 3 is depleted.

[0049] Under the condition of long-term power supply outage, the capacity of the built-in battery of the UPS 3 provides additional power supply capacity and corresponding power supply time for the load outside the battery cabinet 1.

[0050] (3) When the power supply recovers from the power-off state:

[0051] The power supply AC 220V is input to the PCS 2 through the AC input end 21 of the PCS 2. At this time, the PCS 2 is in the power supply mode. On the one hand, the PCS 2 outputs AC 220V to the AC input end 31 of the UPS 3 through the AC output end 22; on the other hand, the PCS 2 charges the battery group 11 through the BAT+ end 23 and the BAT- end 24 connected to the total positive end and the total negative end of the battery group 11. At this time, the UPS 3 receiving AC 220V input is in the normal working mode, and the UPS 3 converts AC 220V into DC through the built-in rectifier to charge the built-in battery of the UPS 3 (if the built-in battery is not full). At the same time, AC 220V is output to the load through the AC output end 32 of the UPS 3.

[0052] (4) The entire super-long standby UPS system repeats the above operation process in the cycle of power supply and power-off of the power supply.

[0053] Further, the embodiment also includes the structure of UPS clusters in parallel, as follows.

[0054] The PCS 2, the battery group 11 and the UPS 3 are electrically connected to form a UPS cluster. The AC output end of the UPS 3 of one UPS cluster can be connected in parallel with the AC output end of the UPS 3 of another UPS cluster or multiple UPS clusters, realizing the parallel connection of the entire cluster, increasing the power and capacity, and meeting the needs of different use scenarios. At the same time, the UPS device meeting the UPS cluster parallel connection function includes the mutual communication function and the synchronous power quality function between the UPSs.

[0055] The above merely describes the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An ultra-long backup power UPS system, characterized by, The battery pack includes one or more battery groups, a power storage converter PCS and an uninterruptible power supply UPS; when the battery groups include two or more, the positive terminals of the battery groups are connected to form a total positive terminal of the battery groups, the negative terminals of the battery groups are connected to form a total negative terminal of the battery groups, the total positive terminal is connected to a direct current positive terminal of the PCS, the total negative terminal is connected to a direct current negative terminal of the PCS, and parallel connection of the battery groups is formed; when the battery groups include one, the positive terminal of the battery group is connected to the direct current positive terminal of the PCS, and the negative terminal of the battery group is connected to the direct current negative terminal of the PCS; an alternating current input end of the PCS is connected to a power input, an alternating current output end of the PCS is connected to an alternating current input end of the UPS, and an alternating current output end of the UPS is connected to a load.

2. The ultra-long backup UPS system of claim 1, wherein, The battery groups, the PCS and the UPS are connected through electricity to form a UPS cluster, the alternating current input ends of the UPSs of two or more UPS clusters are connected in parallel, and the UPSs of the clusters are connected in parallel to supply power to the load.

3. The ultra-long backup UPS system of claim 1, wherein, The positive terminals of the battery groups are connected through a metal conductor to form a total positive terminal of the battery groups, and the negative terminals of the battery groups are connected through another metal conductor to form a total negative terminal of the battery groups.

4. The ultra-long backup UPS system of claim 3, wherein, The metal conductor is a soft copper bar.

5. The ultra-long backup UPS system of claim 4, wherein, Holes are arranged on the soft copper bar to fix the soft copper bar and the electrode terminals of the battery groups.

6. The ultra-long backup UPS system of claim 1, wherein, The positive terminals of the battery groups are connected through wires to form a total positive terminal of the battery groups, and the negative terminals of the battery groups are connected through wires to form a total negative terminal of the battery groups.

7. The ultra-long backup UPS system of claim 1, wherein, The battery groups are lithium iron phosphate batteries.

8. The ultra-long backup UPS system of claim 1, wherein, The battery groups are arranged in a battery cabinet.

9. The ultra-long backup UPS system of claim 1, wherein, The PCS and the battery groups are connected through network cables to communicate.

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