Stationary electric energy storage

IVT-Series as a Link between Generation and Consumption


Home/commercial/industrial storage is the answer to the feeding of decentralized generated electric energy into the power distribution network.

The rising state-subsidized expansion of renewable energies is increasingly leading to unstable situations in the distribution network. The charm of the self-sufficient energy supply is what is attractive about the home storage applications up to a few kW of power.

The avoidance of peak power consumption, however, is what is attractive about commercially or industrially operated large storage applications up to a few MW of power. In UPS systems, however, an environmentally independent energy generation is usually relied on, such as CHP or a diesel generator.

All stationary electric energy storage units combine the need to measure current and voltage precisely.

ICD SERIES combats high cost pressure with home storage applications
 

The home storage applications in the B2C market are under extreme cost pressure. However, the demand for an accurate and particularly high-resolution current measurement of the charging and discharging currents still exists.

With the ICD SERIES, a concept has been developed that exclusively focuses on a digital and calibrated current measurement as well as an ampere-hour metering.

Due to the low system voltage, a galvanic isolation can be done away with and the ICD SERIES can meet the relatively low nominal currents under 100 A with a very compact design and resolution of 1 mA.

IVT SERIES Daisy-Chain Functionality for Large Commercial/Industrial Storage Units
 

With large electrical energy storage units, several stacks of very high power are connected depending on the application case. Each stack has its own BMS. The system voltages of these stacks are now between 800 and 1,000 V due to the lithium-ion technology.

The IVT SERIES can be used permanently in these systems without any problems due to its galvanic isolation up to 1 kV. The precise and high-resolution measurement of the charging and discharging currents in the individual stacks as well as the option to use the voltage measurement channels to measure the stack voltage is a clear advantage of this highly integrated solution.

Another advantage in the system integration of the IVT SERIES is the ability to loop the supply voltage and the CAN bus. The sensors can thus easily be connected in a type of daisy chain from stack to stack and be addressed via configured CAN IDs.

IVT SERIES Supports Supply Security in UPS Systems
 

A battery-powered uninterruptible power supply unit (UPS) has many application areas, such as server centers, hospitals, mobile communications antennas or generally for power supply in regions with a weak network infrastructure.

In contrast to home/commercial/industrial storage units, the lead-acid battery is still widely used here as battery technology. If the energy feed can be influenced by means of a CHP or simple diesel generator, then the battery diagnostics of lead-acid batteries become more important.

With lead-acid batteries, the IVT-SERIES is proven above all by the additional voltage measurement channels in addition to the precise and high-resolution current measurement. Thus, the center tap of the 48 V lead-acid system in particular is measured in addition to the total stack voltage. This facilitates the service and monitoring of the individual cell blocks during maintenance and repair.

The performance always depends on the weakest cell block, especially with lead-acid applications.

"In the still relatively new market environment of stationary energy storage, our sensors have thus far already proven themselves in research projects and initial field tests. We are now eager to see how this sales area will develop. It is an interesting future market in our view."

Jens Hartmann, Vice President Sales