UPS Power Control Center configuration

UPS Power Control Center configuration




Abstract: General Electric Power Dispatching Center of the UPS system configuration options, including the choice of power supply, UPS configuration, the battery capacity calculation programs.



First, an overview of

Electric power industry is a key basic industries, the people's livelihood. In order to build a safe and reliable electric power scheduling system, effectively guaranteeing security of electricity supply grid, effectively reduce the power failure, local power companies have been to enhance the power of information technology infrastructure. Electric Power Dispatching Center has now become a large-scale information and data collection, transit, and communications centers, so the need for a safe, reliable, stable, high-quality power for the dispatch communications center and information center power the appliance.



2, system design

1, the load power supply options

The past, power dispatch, subject to planning and the increasing influence of the load, generally using UPS decentralized power supply, different periods of time device configuration of different UPS, causing the engine room UPS brand, model number, stand-alone reliability, poor alignment of the complex, there is serious security and management risks, and lower investment returns.

The new dispatch room planning, or the transformation of the old room, we should take into account the characteristics of the load, system reliability and availability and other factors, as far as possible in parallel redundant UPS, post and then depending on the load growth in demand, on-line uninterruptible power supply expansion. A centralized power supply power supply to power supply, this power management of simple and limited, simple circuit, reliability is also higher investment returns are high.



1, UPS options

Power dispatch in accordance with a load of room to design in general, the main load, including communications systems, automation systems, scheduling MIS systems, emergency lighting systems, etc.. Because of its importance of the load, so when you select UPS, are the traditional choice of high-power frequency machine-based. In order to ensure overall system reliability.



To further enhance the reliability of the UPS power supply system, it is recommended way to configure redundant UPS in accordance with the current UPS Power Program key "1 +1" redundancy and dual bus parallel program-based. Parallel redundant technology and systems in which structure is simple, cost-effective, mature technologies and other characteristics, are widely used in various sizes Power Dispatching Center. Under normal circumstances, UPS and computer system reliability can be achieved for more than 0.99999, much higher than the 0.9 power grid reliability, to meet the existing dispatch center reliability requirements.



2, UPS options

Power dispatch in accordance with a load of room to design in general, the main load, including communications systems, automation systems, scheduling MIS systems, emergency lighting systems, etc.. Because of its importance of the load, so when you select UPS, are the traditional choice of high-power frequency machine-based. In order to ensure overall system reliability.

To further enhance the reliability of the UPS power supply system, it is recommended way to configure redundant UPS in accordance with the current UPS Power Program key "1 +1" redundancy and dual bus parallel program-based. Parallel redundant technology and systems in which structure is simple, cost-effective, mature technologies and other characteristics, are widely used in various sizes Power Dispatching Center. Under normal circumstances, UPS and computer system reliability can be achieved for more than 0.99999, much higher than the 0.9 power grid reliability, to meet the existing dispatch center reliability requirements.



3.1 UPS input configuration



UPS system, the exchange of the importation of electricity I, II two-way AC380V power supply, they are scheduling the building from the basement (electricity I, II) low-voltage side of distribution transformers of different bus. Mains I, II two-way AC380V power supply configuration ATS Automatic Transfer Switch to switch, by switching the way after the AC power at the same time to the UPS power supply. UPS entered using double-loop design, upcoming main input and bypass input received respectively two different input switch, ensure that once the UPS when the main circuit escape to open space, UPS bypass input power is still power to the loads, improve system reliability.



2.1 UPS output configuration program

The output of two UPS in parallel through the direct, the output sent to the output of the overall power distribution panel, and then redistributed to each distribution of electric screens. Two UPS usually normal operation, sharing the load. If one of a Taiwan UPS fault, then fault the opportunity to quickly and reliably locking the output, the load borne entirely by another UPS; if another UPS overload, then jumping at the same time two UPS bypass, shared the load.

Every UPS comes standard with a static bypass switch and maintenance bypass switch, repair process does not affect the normal operation of the load, if another UPS is not overloaded, then the fault machine maintenance and put into operation in the process, the load can still be used by the another UPS power inverter output high-quality alternating current.

At the same time the system configuration external manual maintenance bypass. When the UPS need to down for maintenance or failure to replace, due to maintenance time is longer, often more than the system to allow power-off time. At this point you can manually through external maintenance bypass, the UPS was spun off from the power supply system, the system temporarily in the electricity supply state, until the UPS system maintenance is completed, to ensure the ongoing work-load system operation.

2.2 The battery configuration

3.3.1 Battery capacity calculation

Battery capacity computing reference to telecommunications industry standards "YD/T5040-2005 communication power equipment installation engineering design specifications" are calculated

The formula is as follows:

Q = (1)

Where: Q - battery capacity (Ah)

K - safety factor, taking 1.25

I - Load Current (A)

T - number of hours the battery discharge (h)

η - coefficient of discharge capacity

t - the seat of the actual battery discharge minimum temperature values, the seat of a heating device, according to 15 ℃ to consider, no heating equipment, according to 5 ℃ taken into account;

α - battery temperature coefficient (1 / ℃), when the discharge rate of ≥ 10 hours, the taking α = 0.006; hours when 1 ≤ discharge rate of "10 o'clock, take α = 0.008; when the discharge rate of the small" 1, taking α = 0.01

Of which:

(B)

Where: S - UPS rated capacity (KVA)

I - Calculation of battery discharge current (A)

μ - the efficiency of power inverter

U - Battery discharge power inverter input voltage (V) (battery voltage monomer 1.85 pm)



3.3.2 Optimization of cell configuration

UPS system configuration, that they will strictly require back-up time for the whole system. 1 hour, for example the system back-up. Traditional UPS and the machine program, consider a single UPS failure, you need to configure the UPS for each 1 hour battery, a total of 2 hours battery, to ensure that single failure of the system will still be able to ensure sufficient back-up time for follow-up operation. This configuration, the battery according to two hours to configure, not only high investment costs, and also the need for additional space occupied by 1 hour battery life and additional load-bearing investments in the transformation of the old room, they often result in excessive space, resulting in undesirable heat dissipation, maintaining access is too narrow and so on, to the system maintenance for the inconvenience.

Therefore, the recommended option UPS, you can choose to share with, and machine features battery UPS. Using common battery, the entire UPS system battery energy storage system as a complete supply of the UPS system. When a single UPS failure does not affect the UPS battery system to another power supply, so at this time the battery can not consider redundancy. Time of 1 hour backup UPS system as an example, this time just to configure a set of requirements to meet the 1 hour battery pack can power than traditional savings programs to reduce the amount of one times the battery life. Can save an enormous amount of the acquisition cost of batteries and battery-related investment.



3.5 Summary

Electric Power Dispatching Center building as an important power scheduling and management bodies, advanced scheduling systems, communications systems and computer systems, while the core network and other key business and stable operation, but also safe, reliable and stable platform to support the momentum. Choose a reliable UPS power supply system, to help provide the stable operation of electric power dispatching system, and optimize the investment program, spending the right money, to achieve the desired effect.



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