Research on UPS Power Shared Battery Pack Processing Method

　　Author ：Iflowpower – Portable Power Station Supplier

In order to improve the system reliability, the machine room in this chance uses N + X parallel redundancy or the double bus line UPS configuration method. In the past, the number of UPS hosts is much, while the number of batteries is often increased in proportion, so that investments in money, space, load-bearing, maintenance, etc., sometimes even UPS hosts.

Several times. So is there a way to match the battery if the system is not or less affected? Is there a way to have a battery pack so that the battery pack must be redundant without a redundancy? Sharing battery pack is a good way to do. Second, the theoretical basis of sharing battery pack approach and its superiority so-called shared battery pack method is to refer to two or more UPS hosts using a group or multi-set battery processing method.

When the main electricity is normal, each UPS is charged to the battery pack, the mains are abnormal or interrupted, each UPS also uses the energy inverse of the battery pack into an alternating current supply load. The system architecture of the shared battery pack method is as follows: In the N + X parallel redundancy or the double-phase configuration system, the UPS host must have redundancy, such as: 2 + 1 and contact, redundancy accounts for 33% of total capacity 1 + 1 and the redundancy is 50%, 1 + 2, and the redundancy is 67% of the total capacity, accounting for at least 50% of the total capacity in the double bus system. etc.

According to the conventional battery configuration, each UPS host has a respective battery pack. If the UPS host cannot be inverted for any reason, the battery pack that it belongs is followed, although the battery is not faulty. Therefore, the UPS host redundancy, the battery is also redundant, the main unit redundancy accounts for a few percent of the total set of UPS, the battery redundancy is also followed by a few% of the total battery capacity, but in this way to make the system backup Time is not affected, achieving real redundancy.

Change your ideas, when a UPS host fails, if the battery it is transferred to other normal UPS, then the battery is not necessarily redundant? The backup time of the entire system is not the same. Is it not affected? This is the theoretical basis for sharing battery pack methods. The shared battery pack method has the following advantages: 1.

Save the redundancy of the money investment system in the purchase of batteries accounts for a few percent of the total system, and can save a few percent of the total battery investment. Today, the price of the battery is flying, this cost that can save is quite considerable. At the same time, the number of batteries is reduced, and investments such as handling, installation, etc.

will also be reduced. 2. Save the installation space of installation space investment, the installation space, which reduces the number of batteries, and reduces the investment in installation space in proportion.

At the same time, the investment in rent, decoration fee, air conditioning configuration, etc. 3. Savehold investment battery packs is very heavy, in order to solve the problem of floor load, generally open large battery placement area or be loaded.

If the number of batteries is reduced, this is 8; 7787. Six six six power. .

Investment in, 5, 7, and investment will save accordingly. 4. Save operation costs The number of battalies is less, the system itself and the electric energy consumed by the room air conditioner are less, and the maintenance cost to be investing is small, and it will be more environmentally friendly.

5. The system expansion is relatively easy to share the UPS system of shared battery packs. When expansion in the future, you can add a battery.

If the backup time of the existing battery pack is still enough, the new UPS host will be added. Expansion will become very simple, convenient, save money. 6.

Growth of the maximum effectiveness of the battery, improve the battery utilization battery is maintained, if you do not discharge long, you will lose activity. About traditional battery configuration methods, due to the large number of batteries, the battery will be small current discharge, the battery capacity may not be removed, and the market is already recovered. The shallow discharge of this small current is not good for the battery.

For a long time, the battery performance will decline, once a UPS is broken, other UPS batteries will not reach the requirements. And the shared battery pack method, because the number of batteries is relatively small, the discharge current of the battery after power-on is relatively large, and the battery capacity can also be placed, which is conducive to improving the activity of the battery, extending the battery life. Once a UPS is broken, the backup time of the system will not be affected because the battery will not be able to fill the UPS.

From the above decomposition, it can be seen that the shared battery pack approach has a lot of advantages, especially when investment, load-bearing, installation space and other conditions are limited, this approach shows its superiority. Third, several issues to be handled by the shared battery pack, since the shared battery pack method has many advantages, why is there many advantages? Why do many vendors usually promote their UPS has a shared battery pack function, and actually use But I don't dare to propose customers to use? This is because it is not per UPS to share battery packs, sharing battery packs should be technical support. There are more than one problem with shared battery packs.

The problem is more concerned: 1. Different parent rows are connected, will each UPS rectifier will be affected? Can the voltage stability of DC ore? Differential row Is it small enough? 2. How do each UPS be addressed to the battery? How do the UPS rectifier failures, how will each UPS action? 5.

If one of the UPS inverter fails, how will the UPS do? 6. If the shared battery pack part is faulty, such as a short circuit, How do each UPS self-protection? These problems are related to the security and stability of the entire system, very important, different manufacturers' solutions are different, so they must choose the technical strength and manufacturing when choosing a shared battery pack. Related experiences rich UPS vendors.

IV. Delta NT series UPS shared battery pack processing Measures NT series UPS can be multi-machine sharing battery pack, in series, parallel, double bus architecture, can be used. At present, there are two 30kva-shared battery packs in Shanghai Railway Bureau dispatching control center in normal operation; two 320kva UPS shared battery packs in Jiujiang Telecom are operating normally; two 40kva in Shandong Provincial Committee The UPS shared battery pack is operating normally; two 30kva UPS shared battery packs in Shandong TV station are running normally; three 40kVA UPS shared battery packs in Yingtan Telecom have normal operation, etc.

, these cases have never been shared by sharing battery packs. Faulty. On the UPS processing lines of Delta also detect parallel machines with shared battery packs.

Therefore, the technology of Taiha UPS in sharing battery pack is still quite reliable, and related experience is still very rich. The Delta NT Series UPS is tight to solve the above problems: Related questions 1: After the DC mother rows of each set, the rectifier work is substantially unaffected, because the SCR opening of each rectifier is driven The signal is controlled, and the direct current parent row is not connected. As long as the DC voltage feedback signal is accurate and timely, the drive signal is correct, the work of the SCR will not be affected.

Therefore, 12 pulse rectifiers, 18 pulse rectifiers can safely and stable operation, and even dozens of rectifying modules of the switching power supply can be straight up and safely. Anti-step, if the control is good, the rectifier will not only have a bad place, but also benefits, because they can counteract some low-end harmonics to make the DC voltage smaller, DC voltage is more stable. The rectifier of the Delta NT series UPS is controlled by a special CPU.

The acquisition signal is accurate and timely, the drive signal is correct, and the anti-interference ability is strong. The UPS also has an automatic average flow function, which not only guarantees the three-phase input current per UPS, but also adjusts the current difference between the rectifiers of each parallel UPS, which will not be too large, otherwise the current UPS will be limited to the limit. To improve the security of the entire system.

The Delta NT Series UPS will reach ± ​​1% of the DC voltage stability regardless of the single-machine operation or sharing battery pack. Problem 2: Delta NT Series UPS can set battery capacity, all / floating voltage, charging current, battery low voltage alarm point, battery cutoff, battery cutoff, etc. according to battery capacity sizes and load.

If the battery pack is shared, the "shared battery pack" on the operation panel is set to "YES", and the battery capacity and charging current are set to 1 / n of the battery to be 1 / n (n is the number of hosts). After the power is electric power, each UPS starts discharging, when the battery voltage is lower than the charge pressure point, each UPS simultaneously activates the full charge, when the cutoff voltage point or deadline, each UPS is turned simultaneously Floating. At normal operation, if the person is average full-speed function of the single UPS, the unit UPS is maximizing the set charging current, and the time is automatically converted to floating, which will not affect the system.

Related questions 3: When the Delta NT series UPS shared battery pack, the "battery online detection" function is invalid, because the single test "battery" is meaningless. According to the requirements, the software can also be modified. When starting one of the UPS's "battery online probe" function, make each UPS simultaneously.

Related questions 4: In the operation, if a UPS rectifier is faulty, the fault will alarm and go to the battery operating state until the battery pack voltage dropped to 330V, the lock machine protection (normal UPS battery protection lock machine Voltage is generally 300V). Other UPS will work in a normal working state, and the maximum charge is charged with the set charging current. If the rectifier is damaged seriously, even short-circuited, the fuse of the fault rectifier and the direct current parent row will quickly blow, and the single fault point does not affect the entire system.

Related questions 5: In the operation, if a UPS is faulty, the fault will alarm, the parallel system, the fault UPS will lock the output, the load is borne by another UPS. If additional UPS is overloaded, all UPS is transferred to the bypass working status and continuously supply the load. About the series or buses system, the fault UPS will turn straight to the bypass working state and continue to power the load.

If the inverter is damaged seriously, even short-circuited, the fuse of the fail-computer inverter is connected to the DC parent row quickly blows, and the single fault point does not affect the entire system. Problem 6: The Delta NT Series UPS battery pack with the direct current parent row protection The electromagnetic contactor will not be absorbed. When the battery pack is short-circuit, there will be fused fuse to protect the entire system.

V. V. V.

Implementing the problem of sharing the battery pack method to pay attention to the alert as much as possible to share only one set of batteries: The system will stop. Based on related experience, it is best to choose 2-5 sets of battery sharing, as this can be alert battery pack order fault, but also for battery packs.