The Droop control technique is the most common technique for integrating the parallel-connected DGs in microgrid due to its simplicity, no communication channel required, easy plug and play operation. The HV lines are inductive in nature, LV lines are resistive in nature and MV lines have combined characteristics. The fundamentals behind the droop control are that active power flow depends on the phase angle difference and reactive power flow depends on the voltage magnitude difference. But this concept suits for only the inductive lines. In the reverse droop, the fundamentals are active power flow depends on the voltage magnitude difference and the reactive power flow depends on the phase angle difference. But this suits for only the resistive lines. Conceptually, we should apply droop control in the HV grids and reverse droop in the case of LV grids. I saw in various papers, authors had applied droop control in the case of LV grids rather than reverse droop.
Basically, the conventional droop is operable in the low
voltage grid due to the generator’s voltage variability by means
of exchanging reactive power. The reactive power of each
generator is tuned the way that the resulting voltage profile
satisfies the desired active power distribution. In the low
voltage grid the reactive power is a function of the phase angle
(s. Eq. 3). This is adjusted with the active power / frequency -
droop. The control sense of the entire loop has to be consistent.
Four stable operating points result, two of which make sense,
depending on the slopes of the droops.
A mathematical derivation and respective simulations will
be presented in the full paper, explaining the effectiveness of
the “indirect operation” of the droop control in LV-grids.
Are you Meer Zafarullah Noohani talking about the paper mentioned below:
A. Engler and N. Soultanis, "Droop control in LV-grids," 2005 International Conference on Future Power Systems, Amsterdam, 2005, pp. 6 pp.-6, doi: 10.1109/FPS.2005.204224.
My only experience with droop control is with dc output modular power converters, where it provides a 'communication channel free' method of load sharing. Reverse droop has been used to compensate for line drops without remote sensing, but wouldn't it result in an unstable condition for load sharing?
- Badges
- Science topic