UPS Systems: How to Ensure Continuity of Electrical Supply

An uninterruptible power supply (UPS) is a device that provides backup power to electronic equipment in the event of a power outage or interruption. It acts as a protection system that delivers temporary power until the permanent source is restored, such as a generator or the electrical grid.

What Is the Purpose of a UPS System?

Its main objectives are twofold: to provide backup power as quickly as possible when there is a loss of supply, and to offer a certain degree of protection against power quality issues that can damage equipment.

Depending on their design and characteristics, UPS systems can fulfill these objectives to varying degrees.

What Are Power Quality Issues?

Power quality refers to the suitability of a power source in terms of voltage, frequency, and waveform.

Electrical equipment is designed to operate with power that meets certain characteristics, such as 12 or 24 volts, or, when designed for alternating current, 50 or 60 hertz. Likewise, the power supplied by the grid (or another source such as a generator or battery bank) was configured to meet a specific voltage or frequency level.

Typical problems associated with power quality include:

Power supply interruption. Power supply interruption.
Voltage sag/undervoltage. Voltage sag/undervoltage.
Voltage surge/overvoltage. Voltage surge/overvoltage.
Transients/spikes/surges. Transients/spikes/surges.
Noise. Noise.
Harmonic distortion. Harmonic distortion.

In Which Cases Is It Essential to Protect the Electrical Supply?

In countries located in hurricane-prone regions and subject to other weather events (such as the Dominican Republic or Puerto Rico), having a UPS system is especially important because these adverse weather conditions represent a risk to the electrical grid.

Furthermore, since UPS systems protect equipment, they are suitable for any situation where electrical loads may be sensitive to power loss or other power quality issues. For example, UPS systems are commonly used for computers and servers, as power loss can result in data loss or component damage.

Similarly, various types of medical and laboratory equipment are sensitive to these failures. In many facilities in developing countries, the electrical grid is unreliable or of poor quality, resulting in scheduled or unscheduled power outages during much of the day, generating downtime that affects the quality and availability of critical services.

Types of UPS Systems

Based on the power quality issues they address, three types of uninterruptible power supply systems are used:

Double-Conversion or Online UPS

This is the most advanced and reliable type of UPS. This system provides complete, constant protection by supplying electrical power through its internal inverter. Power from the grid is converted to direct current and then converted back to alternating current, ensuring power quality free from fluctuations. In the event of a power outage, the double-conversion UPS uses its internal battery to continue supplying power without interruption.

Standby or Offline UPS

This is a type of UPS that operates in standby mode, constantly monitoring the quality of electrical power from the grid. In the event of a power outage, the system quickly activates an internal battery to provide backup power to connected devices.

Interactive UPS

This offers more advanced protection than a standby UPS. This system actively monitors and regulates the quality of electrical power from the grid, using an automatic voltage regulator (AVR) to stabilize voltage fluctuations. In the event of a power outage, this system uses its internal battery to provide backup power without interruption.

Key Technology for Ensuring Mission-Critical Operations

UPS systems play a fundamental role in areas prone to adverse weather events and where the reliability of the electrical grid is limited.

By ensuring a constant and reliable power supply, UPS systems help maintain the operation of critical equipment and safeguard data integrity. They are the key to protecting electronic devices and ensuring the continuity of mission-critical operations in environments with electrical challenges.

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