Uninterrupted Power Quality System (UPQ)
UPQ is a marriage of a UPS and a AHF and it gives you the functionality of both. It performs normally as a AHF most of the time and can switch into power protection mode that performs like a UPS when transient sag (0...1 p.u) is detected. Operation of a UPQ in power protection mode is activated when voltage falls outside of +/- 10% of 1 p.u. and brings the supply voltage to within +/- 10%.
UPQ connects in parallel to the load and maximum losses is limited to 1.5%.
In power quality mode, the UPQ functions exactly like a AHF and cleans harmonics in the supply lines.
1. Static switch
• Separates system from faulty network
2. Inverter module
• Produces output currents and voltages
3. Control system
• Controls the Inverter module
• Detects faults in the network
4. Energy storage
• Provides active power when needed
• Batteries or super capacitors
UPQ comes by default with Ultra Capacitors
(UC)/Super Capacitors which provides excellent
protection for short-term interruptions. However, UPQ solution can be tailored for
applications
requiring power protection for extended periods of time.
UPQ Solution can be designed for applications requiring power back up of minutes
with the use of
Lithium-Titanate (LTO) Batteries as energy storage media. However, if the power protection
is needed for
even longer period of time, Lithium-Ion (Li-Ion) batteries will be an ideal energy storage
media.
Uninterrupted Power Quality (UPQ) has two operation modes. In secured supply conditions, it operates in power quality mode, performing active filtering of harmonic distortions as well as load balancing and flicker mitigation. When it detects a voltage sag or power outage in the supply network, it shifts to power protection mode to protect against critical loads. UPQ is available from low up to medium voltage levels.
In the event of power outages or voltage sags, the
UPQ activates power protection mode. During this mode, real active power and real reactive
power are provided to the loads, ensuring complete immunity to the mission critical
processes from utility power interruptions, voltage sags and swells. This guarantees maximum
system availability and reliability for mission critical processes.
After the fault is cleared, UPQ returns to its
normal power quality operation mode, where it actively filters harmonic distortions up to
50th order, mitigates flicker, balances loads, improves power factor and controls
voltage.
Unlike conventional UPS systems, UPQ does not
limit the short circuit current. Therefore Ik’(S)
equals Ik’(L). This unique feature enables Direct On Line (DOL) motor starting and is
further improved by
UPQ’s real time reactive power compensation.
Since the short circuit current is not limited, also the selectivity of the fuse
protection downstream from
the UPQ’s main bus operates like in the systems connected directly to the grid.
Typical Applications
UPQ have many low and high voltage potential applications where their use offers many benefits.
⦿ Installations with fast changing reactive power demand
like electric arc furnaces and ball mills.
⦿ Highly
dynamic loads where the power factor fluctuates rapidly or in big steps like cranes, sawmill
machinery, welding machines, etc.
⦿ Correction of
leading power factor like in data centers allowing back-up generators
operation.
⦿ UPC systems.
⦿ Solar inverters and
wind turbine generators.
⦿ Railway electrification systems: Trains &
trams
⦿ Loads with low power factor: Motors,
cables, lightly loaded transformers, lighting, etc.
