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Itech IT7900P series regenerative grid emulators
Itech IT-M3900C Compact bi-directional DC power supplies
Itech IT-M3900B compact regenerative DC power supply/load
H&H QL series bipolar power supplies
NGL200 Bi-directional Lab Power supplies from R&S
Itech IT6000C series bidirectional power supplies
Chroma 62000D Programmable DC Power Supply and Load
Itech IT-M3400 ultra compact bi-directional DC power supplies
Itech IT6400 series bipolar DC power supplies
Ultra-small current ripple up to 2 μArms
NF BP4610 bipolar power supply
Itech IT-M3600 Regenerative Power System
Itech IT6000B Bi-directional DC Power Supply
Cinergia GE/EL+ VAC/DC Regenerative Converter
Cinergia B2C series bidirectional battery charger
Normal standard DC power supplies operate in one quadrant; a positive voltage and a positive current. Unipolar power supplies, Bi-directional power supplies and Bipolar power supplies differ from a “normal” DC power supply because they can operate in multiple quadrants.
In the case of a Unipolar power supply (also known as bi-directional power supply), these are two quadrants. And then we have to make an extra distinction between power supplies with a positive current and positive or negative voltage and power supplies with a positive voltage and positive or negative current.
Unipolar power supplies
A unipolar power supply with a positive current and positive or negative voltage is used, for example, as an amplifier for a function generator or as power supply for a photo multiplier.
The second form (with a positive voltage and positive or negative current) is more common nowadays. As battery charger / discharger for example. Or for testing bi-directional dc converters (electric car industry), driving DC motors (because of the against EMK) or as a battery emulator.
The four quadrant bipolar power supplies are capable of both providing current (power supply) and absorbing current (load). And this with both a positive and a negative voltage. Four quadrant power supplies are often used as grid emulators or power in the loop amplifier.
These power supplies are often regenerative at higher power levels. The absorbed power (load mode) is then converted back to an AC power that is delivered back to the grid.In this way you save money in several ways. First of all, the energy delivered back is deducted from the energy bill. In addition, you do not need an air conditioning system to dissipate this energy, which is normally converted into heat. And in some cases you also save on the energy bill because you do not need a heavier grid connection. And of course you also save the environment.
Bipolar power supplies
For a complete overview of the Unipolar and Bipolar power supplies in our product portfolio we would like to refer you to the overview pages:
Two quadrant power supplies
Four quadrant power supplies
"The ABB Power Grids Jumet organisation is an innovative development and production facility of ABB that manufactures active filters and battery energy storage systems to support a stable grid. To test these systems we have acquired two Cinergia GE/EL +120kVA eplus units capable of doing grid emulation (AC + DC), operating as an electronic load (AC +DC) and being a battery emulator. We have experienced very good support from TTMS in obtaining these two Cinergia units. This included organising an on-site demonstration and supplying loan systems prior to the delivery of our final systems. This way we could start testing as early as possible. TTMS also organised training for the operators from the original manufacturer. This support allowed us to introduce the first battery energy storage systems even prior to the full delivery of the Cinergia systems."
University of Luxembourg
“At the Energy and Environment department of the Faculty of Science, Technology and Medicine (FSTM) of the University of Luxembourg we do have different research projects related to green energy contributing to the development of eco-cities. As a long-standing partner of our research unit, TT&MS has proven that they are able to answer even the most complex questions in a professional manner. They have shown that they are always up to date with the latest technology and do not spare any effort to look at the application and even the situation on site. The exchange of ideas was always very pleasant and took place quickly. We look forward to further years of fruitful cooperation.”
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