Data center power quality improvement solutions

Summary

Data center is one of the most popular technology for recent years. The power substation of the data center provides reliable and stable power source to the devices in the engine room. To the whole data center system, the reliability of the power distribution is the main task of the power substation. Even a few minutes power cut may cause millions of USD lost.

Benefit from the technology of electronic power innovation, great changes happened of the power load of the modern IDC engine room, reliable, efficient and clear energy becomes the new trend of the power supply business trend. As the widely use of the HVDC, UPS, a higher utilize of energy efficiency is realized by using the frequency converter. But the side effect of the HVDC, UPS, converter and switching power supply is the capacitive reactive power harmonic. The power quality problems duce to the harmonic and reactive power becomes the crucial issue to strict the liability of the data center.

Application of data center

1.Solution of data center engine room

For the situation of the IDC engine room, the reactive power is serious, Sfere Electric provides the Static Var Generator (SVG). It has bidirectional compensation ability to maintain the system at 0.99 power factor. Meanwhile apply the Active Power Filter(APF) to solve the harmonic issue of the data center, release the damage of the harmonic damage to the power supply system, avoide the risk of resonance oscillation, improve the power environment of the data center engine room, enhance the power reliability.

This solution is specialized for the data center power substation. Because the load of the engine room is provide from the UPS, the amount of the capacitive reactive power is quiet big in the process of the UPS rectification, so the SVG was being used. It has bidirectional reactive power compensation ability, it keeps the unit power factor close to 1. Meanwhile apply the Active Power Filter(APF) to solve the harmonic issue of the data center, release the damage of the harmonic damage to the power supply system, avoid the risk of resonance oscillation, improve the power environment of the data center engine room, enhance the power reliability.

Main function

■Anti-Harmonic, remain the system security

■Continuing smooth compensation, higher response speed to better compensation result for the voltage flicker, solve the current unbalance simultaneously.

■ For the 3rd , 5th , 7th, 9th , 11th and 13th harmonic filtering

■SVG Response speed less than 5ms

■Up to 50th harmonic filtering, 97% harmonic will be release

■8 inch LCD touch screen, power line display, wave form comparison for the compensation process, harmonic spectrogram display, THDi, THDu, current effective value, power factor etc.

■Total response speed less than 5ms, quick control, benefit to improve the transient state stability.

2、Data center infrastructure solution

For the data center infrastructure, the major nonlinear loading is the air conditioners and the office equipment. Use the dynamic dynamic harmonic elimination reactive power compensation lifting system power factor, use the active power filter module to solve the harmonic issue in the same time. Release the damage of the harmonic to the power system, avoid the risk of resonance oscillation, improve the power environment of the data center engine room, enhanced the power reliability.

Main function

■ Visualized HMI, RS485 interface, full range of standard communication protocols

■Menu/Auto switching, isometric/programming and fuzzy control mode of switching, harmonic protection

■Response time less than 20ms, no inrushing when connecting

■ Reactance ratio precise matching, dielectric loss ≤0.1w/ kVar, capacitor reset electro-discharge, residual voltage decent to 50V or below within 1 minute after power off.

■Up to 50th harmonic filtering, harmonic filtering rate more than 97%

■8 inch LCD touch screen, power line display, wave form comparison for the compensation process, harmonic spectrogram display, THDi, THDu, current effective value, power factor etc.

■Device outer electric error protection, including BUSBAR short circuit, over voltage/under voltage, over current/under current, phase sequence error, reverse current

■ Total response speed less than 5ms, quick control, benefit to improve the transient state stability.

Product introduction

1、Static Var Generator SFR-SVG

Advantages:

8 inch HMI

Real time dynamic compensation, electrodeless out put

Quick response in micro second

Functions ：

Display voltage, current, power factor, wave form and power line, record check etc.

2、Active power filter

Advantage:

8 inch HMI

Up to 50th harmonic filtering, harmonic release rate at 97%

Total response time less than 5ms, more efficiency

Function:

Display the system power line and wave form before/after compensation, harmonic spectrogram, THDi, THDu, current effective value, power factor etc.

3、Reactive power compensator controller WGK-31

Advantages:

High definition HMI

Menu/Auto switching, isometric, programming, fuzzy control switching available

Function：

Display current, voltage, active power, reactive power factor, reactive power factor etc.

4、Dynamic switching unit

Advantages:

Imported Silicon Control (SCR)

Micro Second response time

No inrush current when close loop, no high voltage when open loop

Function：

Dynamic switching unit use the Thyristor as the contractor for contactless, high reliable switching of dynamic active power factor compensation

5、Harmonic elimination reactive power compensation module SLG

Advantage：

Reactance ratio precise matching

Pattern frameless design of the reactance

Function:

Harmonic elimination reactive power compensation module SLG is a filtering loop which combines from the filtering reactance and a certain capacitive low voltage capacitor in a proper ratio to accomplish the reactive power compensation and harmonic filtering purpose.

Harmonic elimination reactive power compensation module SLG