Published On: Dec 11, 2015
India, the second most populous country in the world is poised to become the most populous country by the next decade or so. Due to this increasing population trend and resultant commercial / industrial activity, the demand for electricity is and will continue to rise. While the demand continues to rise at a speed greater than the availability of supply, resulting in demand supply gap not getting bridged. There is a need for localized power sources which also act as backup sources during emergency power cut-offs. Such back-up devices like Uninterruptible Power Supply (UPS) and Inverters are frequently used in most premises– both residential and commercial. Depending on the premise requirement like size, power, etc. the backup devices may come in different capacities. While these backup devices address the contingency at hand however electricity provided by them comes at a much higher cost than the grid supply.
This blog assesses UPS and Inverters in terms of PQ issues they address orthemselves create. The blog also identifies mitigation steps required for reducing impact on power quality by use of such equipment.
A UPS/Inverter regulates the incoming power to acceptable parameters and suppliesrequired amount of power over specified time when there isno mains supply.These back up devices are of great help at most places; be it a residential premise, a sophisticated industrial production lineor a hospitalwhere life critical equipment are deployed.In addition to providing back-up power supply, these devices also save critical equipment from poor PQ in the following ways:
Back-up systems are mainly provided to protect the loads from power interruptions, though some of the more advanced systems do address quality issues as well, including voltage and frequency improvements, control of harmonics, blocking the surges and noise emanating from the supply systems from reaching the critical loads. These backup devices are used generally as a last line of defense for poor PQ and help in maintaining adequate supply to end devices when needed.
The common misconception that a UPS/Inverters fixes all power quality problems can lead to antroublesomecondition. UPS/Inverters, while serving as reliable backup power sources, are also responsible for rising PQ issues. Installing a UPS will not remedy infrastructure problems such as neutrals overheating due to load-generated harmonics. Even inverters or UPS themselves can be source of harmonics generation if not designed well. In fact, the UPS may even cause power problems upstream from where it connects into the distribution system. Some of the critical issues that arises from the use of UPS/Inverters are stated as below:
Keeping in mind the power quality challenges, creating a reliable inverter and a UPS system poses a special challenge to the manufacturers. Due to the frequency of power disturbances, the power electronic circuitry in the inverters and UPS must work under great stress. This especially holds true for inverters and line interactive UPS, that must make the transfer to the battery backup whenever there is disturbance. If UPS and inverters are not designed specifically to meet the power conditions, then they may meet higher failure rates.Thus, its important for any UPS and inverter to maintain power supply and perform well even in critical situations assuring its reliability and endurance.Some of the basic measures one needs to guard against while choosing or designing UPS or Inverters to get best value for money are:
Businesses today invest large sums of money in their power driven systems and infrastructure, as well as the power required to keep it functioning. They count on this investment to keep them productive and competitive. Leaving thisinfrastructure defenseless against electrical dips, spikes and interruptions, therefore, is not a goodidea. A well-built power protection solution, featuring high-quality, highly efficient UPS hardware, can help keep business applications available, power costs manageable and data safe. By familiarizing themselves with the basics of what a UPS does and how to choose the right one for their needs, data center operators can ensure that mission-critical systems always have the clean and reliable electricity needed to drive long-term success.
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