Energy storage outputs reactive power through inverter

How does a Bess inverter work?

The methodology consists of verifying the effects of the reactive power control of two BESSs on the voltage profile and losses of a real medium voltage distribution feeder (13.8 kV), considering that the BESS inverter can act in four quadrants and therefore inject and absorb reactive and active power from the grid.

Does reactive power control affect a distribution feeder?

One way to mitigate such effects is using battery energy storage systems (BESSs), whose technology is experiencing rapid development. In this context, this work studies the influence that the reactive power control dispatched from BESS can have on a real distribution feeder considering its original configuration as well as a load transfer scenario.

What are the main energy storage functionalities?

In addition, the main energy storage functionalities such as energy time-shift, quick energy injection and quick energy extraction are expected to make a large contribution to security of power supplies, power quality and minimization of direct costs and environmental costs ( Zakeri and Syri 2015 ).

How do you calculate reactive power?

If the inverter׳s BESS does not provide all the available apparent power, the control system calculates the available reactive power ( Q a v ( t) ); it can provide or absorb based on the measures through the equation: (1) Q a v ( t) = 30 2 − P B E S S 2 ( t) where the 30 kVA power value is the maximum apparent power of the BESS in Eq. (1).

How much power can a Bess inverter discharge?

To establish that range, the maximum power that the BESS can discharge and the inverter rated power are considered. The lead–carbon BESS has a 400-kVA inverter and a discharge capacity of 125 kW, so the minimum power factor is 0.32, whereas the respective values for the lithium-ion BESS are 750 kVA, 250 kW and 0.34.

How does a battery energy storage system work?

3.1. Battery Energy Storage System The BESS consists of an active front end (AFE), with a 30 kV A nominal power, connected to the grid and to a DC low voltage bus-bar at 600 V through a DC link supplied by a 20 kW DC/DC buck booster and a Li-Polymer battery with 70 A h and 16 kW h total capacity.