Microgrid Inverter Modeling Liu Jinjun

Are grid-forming inverters based on droop control useful in Microgrid Applications?

The grid-forming inverters based on droop control show greatly vitality in microgrid applications owing to their excellent power sharing and frequency supporting ability. However, to obtain good power sharing dynamics required by the grid code, the droop control will introduce inevitable frequency and voltage deviations.

Is a peer-to-peer decentralized solution a good choice for a microgrid system?

In an autonomous AC microgrid system, a peer-to-peer decentralized solution would be a preferred choice for the coordinative control of distributed generation units.

What is a single phase voltage source inverter (VSI)?

In the single-phase voltage source inverter (VSI), the instantaneous output power pulsates at twice the line frequency, generating second-harmonic voltage in dc bus. Bulky electrolytic capacitors or additional auxiliary circuits are used in traditional methods, which inevitably limit the system lifetime, efficiency, and power density.

Why is islanding detection important for a microgrid?

Islanding detection is of great importance for the microgrid in order to change the control objectives and to avoid unsynchronized reclosure.

Why is LCL filter used in grid connected converters?

The LCL filter is widely used in grid connected converters for good harmonic mitigation performance. With pulse width modulation strategy, converter terminal voltage contains various sideband harmonic components together with expected components corresponding to the modulation wave, especially under a low switching frequency.

What is discrete piecewise droop in DC microgrids?

In DC microgrids, the discrete piecewise droop con-trol is an attractive decentralized control strategy due to its ability to better achieve load distribution targets within a preset bus volt-age deviation range.