Control method of energy storage inverter

Why should you use a multilevel inverter instead of VSI?

The buck nature of the VSI output voltage necessitates the use of a boost converter between the energy storage and the inverter, which adds more switches, controls, and complexity. By using a multilevel inverter in place of VSI partly or entirely, the need for filters can be eliminated, resulting in fewer switching losses.

How do inverters control injected reactive power?

In this approach, predetermined values are assigned to the inverter’s active power reference (Pref) and output voltage reference (Vref), serving as fixed points for the control strategy. The control mechanism now entails adjusting the injected reactive power to align with these reference values.

Can battery energy storage systems improve microgrid performance?

The successful integration of battery energy storage systems (BESSs) is crucial for enhancing the resilience and performance of microgrids (MGs) and power systems. This study introduces a control s...

How does a battery energy storage system prevent overdischarge?

Injected active power of both battery energy storage systems (BESSs) in case III. This protective measure prevents overdischarge, preserving the battery’s operational integrity and longevity. It is worth noting that this lower limit depends on the battery technology, and hence, can be easily adjusted in the proposed control scheme.

How much power does an inverter use?

Here, both inverters are set to an active power reference of 30 kW and a reactive power reference of 5 kVAR. Note that the initial battery charge levels are set to 80% for the first and 50% for the second battery to allow evaluation of the inverter’s capability to disconnect a battery as it approaches its lower SoC limit.

What is inverter disconnection?

Inverter disconnection occurs when the SoC falls below its lower limit at 35% . Additionally, to maintain system power balance and stability, the nominal output power remains constant at the nominal capacity when the SoC exceeds 85% .